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Send EmailSulfur , S, S-80, IS60, Svovl, rasulf, thione, sulfur powder, sulfur precipitated, 7704-34-9
Sulfur(α)
CAS: 7704-34-9
Molecular Formula: S8
Names and Identifiers
| Name | Sulfur(α) |
| Synonyms | S S-80 IS60 That s-80 Svovl sulfur rasulf thione sulphur Thiolux supersix tesuloid Super six Sulfur(α) supercosan sulfur roll sulfur powder sulfur flowers sulfur, sublimed microthiol special sulfur precipitated technetiumtc99msulfurcolloid |
| CAS | 7704-34-9 |
| EINECS | 231-722-6 |
| InChI | InChI=1/S |
| InChIKey | RWSOTUBLDIXVET-UHFFFAOYSA-N |
7704-34-9 - Physico-chemical Properties
| Molecular Formula | S8 |
| Molar Mass | 256.52 |
| Density | 2.36 |
| Melting Point | 114 °C |
| Boling Point | 445 °C |
| Flash Point | 168 °C |
| Water Solubility | Insoluble |
| Solubility | carbon disulfide: in accordance1g/5mL |
| Vapor Presure | 1 mm Hg ( 183.8 °C) |
| Vapor Density | 8.9 (vs air) |
| Appearance | powder |
| Specific Gravity | 2.07 |
| Color | Yellow |
| Merck | 13,9059 / 13,9067 |
| Physical and Chemical Properties | The character of powdered sulfur is light yellow powder. melting point 112.8 ℃(α-type) boiling point 444.6 ℃ relative density 2.07(α-type) solubility soluble in carbon disulfide, insoluble in water, slightly soluble in ethanol and ethers. |
| Use | For the manufacture of sulfuric acid, dyes and rubber products, but also for pharmaceutical and other industrial sectorsHigh purity sulfur for semiconductor industry, other uses with sulfur deposition |
7704-34-9 - Risk and Safety
| Risk Codes | R11 - Highly Flammable R38 - Irritating to the skin |
| Safety Description | S16 - Keep away from sources of ignition. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S46 - If swallowed, seek medical advice immediately and show this container or label. |
| UN IDs | UN 1350 4.1/PG 3 |
| WGK Germany | 1 |
| RTECS | WS4250000 |
| TSCA | Yes |
| HS Code | 28020000 |
| Hazard Class | 4.1 |
| Packing Group | III |
| Toxicity | LDLo intravenous in dog: 10mg/kg |
7704-34-9 - Upstream Downstream Industry
7704-34-9 - Nature
Open Data Verified Data
as a yellow or light yellow solid. Easy to burn, the combustion temperature is generally 248~261 degrees Celsius, and sulfur dioxide is produced during combustion. Soluble in carbon disulfide, carbon tetrachloride and benzene, slightly soluble in ethanol and ethers, insoluble in water. Both electrical and thermal conductivity are poor. Liquid sulfur can dissolve hydrogen sulfide, and its solubility increases with the increase of temperature, and hydrogen sulfide can be precipitated when the temperature decreases.
Last Update：2024-01-02 23:10:35
7704-34-9 - Preparation Method
Open Data Verified Data
industrial sulfur is refined by heating, adding arsenic removing agent and heavy metal removing agent, grinding and sieving to obtain food-grade sulfur.
Last Update：2022-01-01 09:04:01
7704-34-9 - Standard
Authoritative Data Verified Data
sulfur (S) of this product shall not be less than 98.0%.
Last Update：2024-01-02 23:10:35
7704-34-9 - Trait
Authoritative Data Verified Data
- This product is yellow crystalline powder; There is a little odor.
- This product is almost insoluble in water or ethanol.
Last Update：2022-01-01 11:32:37
7704-34-9 - Use
Open Data Verified Data
In the food industry for preservation, insecticidal, bleaching and so on. China's provisions are limited to fumigation products.
Last Update：2022-01-01 09:04:01
7704-34-9 - Differential diagnosis
Authoritative Data Verified Data
- when burning, the flame is blue and has the irritating odor of sulfur dioxide.
- take about 10mg of this product, add 5ml of sodium hydroxide solution, heat to dissolve, cool, add 1 drop of sodium nitroprusside cyanide solution (1-100), blue purple.
Last Update：2022-01-01 11:32:37
7704-34-9 - Safety
Open Data Verified Data
GRAS (FDA,& sect;184, 3826,2000). Long-term inhalation of sulfur dust, prone to fatigue, Head Pain, dizziness, indigestion and other symptoms. Staff should be protected. Sulfur dust explosive, 850Tim particle sulfur dust, when the concentration of more than 2. 3g/m3 will be an explosion. Powdered sulfur was stored in a ventilated, dry warehouse. Bulk, granular, and flaky sulfur may be stored in open air or in an indoor warehouse. Keep away from heat source and fire, and do not store and mix with charcoal, acids and oxidants. Due to the precipitation of hydrogen sulfide in the liquid sulfur, the exhaust holes above the storage tank must be kept clear during storage and transportation to avoid the accumulation of hydrogen sulfide and explosion. Sulfur powder should not be affected with moisture. When loading and unloading, it should be handled lightly to prevent moisture due to damage to the package. When there is a fire, it can be suppressed by water, sand and carbon dioxide. The powder is prone to combustion or even explosion in air or when mixed with an oxidant. Non-toxic.
Last Update：2022-01-01 09:04:02
7704-34-9 - Exam
Authoritative Data Verified Data
acidity
take l.Og of this product, add 25ml of water, after strong shaking, add several drops of phenolphthalein indicator solution and 0.10ml of sodium hydroxide titration solution (0.lmol/L), which should be light red.
fineness
take 10.OG of this product, sieved with No. 8 sieve, if there is caking, the mass can be gently clapped and sieved. The powder passing through sieve No. 8 shall not be less than 85.0%.
ignition residue
not more than 0.2% (General rule 0841).
arsenic salt
take 0.50g of this product, add 15ml of ammonia test solution, soak for 3 hours, filter; Take 5ml of filtrate, put it on a water bath to evaporate dry, add 1ml of nitric acid, and then evaporate dry, add hydrochloric acid 5ml and water 23ML, according to the law inspection (General Principles 0822 The first law), should comply with the provisions (0.0012%).
Last Update：2022-01-01 11:32:38
7704-34-9 - Content determination
Authoritative Data Verified Data
take this product, dry it in a phosphorus pentoxide dryer for 4 hours, then take about 35mg, precisely weigh it, and carry out organic destruction according to the oxygen flask combustion method (General rule 0703), 5ml of hydrogen peroxide solution and 10ml of water are used as absorption liquid. After the combustion is completed, the combustion flask is cooled in an ice bath and shaken for about 20 minutes, so that the generated smoke is completely absorbed and boiled for 2 minutes, cool, add 2 drops of phenolphthalein indicator solution, and use sodium hydroxide titration solution (O. 1 mol/L) titration, and the results of the titration were corrected with a blank test. Each 1 ml of sodium hydroxide titration solution (0.1 mol/L) corresponds to 1.603mg of S.
Last Update：2022-01-01 11:32:39
7704-34-9 - Category
Authoritative Data Verified Data
insecticides.
Last Update：2022-01-01 11:32:39
7704-34-9 - Storage
Authoritative Data Verified Data
sealed storage.
Last Update：2022-01-01 11:32:39
7704-34-9 - Sulfur Ointment
Authoritative Data Verified Data
This product sulfur (S) should be 9.0% ~ 11.0%.
trait
This product is yellow ointment, sulfur special odor.
identification
- take about 0.5g of this product, add 5ml of sodium hydroxide test solution, heat to dissolve, filter, let cool, add 1 drop of sodium nitrosoferricyanide test solution (1 - 100), blue-purple.
- take about lg of this product, put it in a test tube, heat and melt, produce irritating odor, and make the wet lead acetate test paper black.
examination
should comply with the relevant provisions under ointment (General rule 0109).
Content determination
take about 0.5g of this product, weigh it accurately, add 5% sodium sulfite solution 40ml, heat reflux for about 1.5 hours, dissolve the sulfur, cool it, and solidify the matrix, filter the solution, wash the remaining matrix with 30ml hot water, cool, filter, wash several times with the same method, combine the filtrate and wash solution, add 10ml formaldehyde test solution and 6ml acetic acid, dilute to 150ml with water, the starch indicator solution was added and titrated with Iodine titration solution (0.05mol/L). Each 1 ml of iodine titrant (0.05mol/L) corresponds to 3.206mg of sulfur (S).
category
The same as the rising of sulfur.
specification
10 %
storage
sealed and stored at 30°C or less.
Last Update：2022-01-01 11:32:40
7704-34-9 - Reference Information
| resistivity | 2E23 |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Non-metallic element | sulfur is also called sulfur, Earth sulfur and stone sulfur, referred to as "sulfur", including sulfur block and sulfur powder. Is a non-metallic element. Element symbol S. It is a light yellow crystal, mainly produced from natural sulfur ore, pyrite, non-ferrous metal sulfide ore, in the coking plant is one of the coke oven gas purification products. There are several kinds of isomers, there are orthogonal sulfur, monoclinic sulfur, elastic sulfur, purple sulfur, liquid sulfur, gas sulfur, amorphous sulfur and so on. The solid sulfur usually obtained is orthorhombic sulfur, monoclinic sulfur and elastic sulfur. They are slightly different in color, generally insoluble in water, slightly soluble in alcohol, soluble in carbon disulfide. There is a special odor, flammable, combustion to produce a strong irritating and asphyxiating gas. Explosive mixtures can be formed with most oxidizing agents such as chlorate, nitrate, perchlorate, permanganate, and the like. Sulfur is a relatively active non-metallic elements, can react with metals, hydrogen, oxygen and other compounds of sulfur. Sulfur is mainly used in the manufacture of sulfuric acid, vulcanized rubber, black powder, matches and pesticides. In medicine, it is mainly used for the treatment of skin diseases. When sulfur burning emits toxic sulfur dioxide gas, the human body is poisoned after inhalation. The poisoned patient must first leave the polluted area, such as the entrance immediately gargle, drinking water and magnesium milk, then sent to the hospital for treatment. Sulfur in coke oven gas mainly exists in the form of hydrogen sulfide, and can be removed by desulfurization and decyanation of coke oven gas. When the absorption method is used for desulfurization and cyanidation, the hydrogen sulfide in the gas is transferred to the acid gas discharged from the desorption tower, which can be used to prepare elemental sulfur; When the oxidation method is used for desulfurization and cyanidation, the hydrogen sulfide in the gas is converted into sulfur foam, From the top of the regeneration column, it can be used to produce molten sulfur. Sulfur will produce acid after moisture, easy to corrode packaging hemp bag. If sulfur is found to smoke, it should be promptly suppressed by water. Damp sulfur, such as long-term contact with iron, may cause spontaneous combustion, found that there is a small fire should be immediately suppressed with water. Attention should be paid in handling. The effluent must be immediately removed and may be washed with an emulsion made of a non-flammable dispersant, if no dispersant may be mixed with sand. Pour to a designated open area to be buried or burned, and scrub the contaminated area with soap water or detergent. China's sulfur is mainly produced in Shanxi, Shandong, Henan, Hunan, Hubei, Jiangxi, Sichuan, Guangdong and other places, mainly sold in the Middle East. |
| rubber vulcanizing agent | sulfur occupies the first place in rubber vulcanizing agent, its price is low, and it is widely used. Suitable for natural rubber and Diene synthetic rubber. In soft rubber products, the general dosage is 0.3~4 parts; In hard products, the dosage is generally 30~60 parts. Vulcanization need to be combined with vulcanization accelerator and promoting auxiliary (such as active agent). Acid will delay the vulcanization, so the sulfur should not contain acid. The solubility of sulfur in rubber varies with the type of rubber, and the solubility increases with the increase of temperature. When the dosage is too much, it is easy to spray sulfur, which affects the aging performance and other physical properties of the product. For the unvulcanized compound, sulfur spraying will also destroy the distribution uniformity of sulfur in the compound, reduce the surface adhesion, and cause difficulties in processing. In order to prevent sulfur spraying of unvulcanized rubber, sulfur should be mixed at low temperature. Before adding sulfur, adding softening agent, using tank method carbon black and adding reclaimed rubber can reduce the phenomenon of sulfur spraying. The use of insoluble sulfur is also the main method to eliminate sulfur spraying. There are six kinds of sulfur mainly used in rubber industry: 1. Sulfur powder: obtained by crushing and screening of refined bulk sulfur. It is the most important curing agent of rubber. 2, precipitated sulfur: good dispersion in rubber. Suitable for high-grade products and latex film products. 3, colloidal sulfur: sulfur powder or precipitated sulfur is ground with dispersant in ball mill or Colloid mill to make paste, I .e. colloidal sulfur, and can also be dried into solid matter. The particles are extremely fine with a particle size of 1-3 μm. It is mainly used for colloidal dairy products, with uniform dispersion and slow settling speed. 4, insoluble sulfur: Because this product is insoluble in carbon disulfide, Therefore, it is called insoluble sulfur. This product is not soluble in the rubber at the processing operation temperature before vulcanization, and is soluble in the rubber at The vulcanization temperature to play the role of vulcanization. Can prevent the mixing rubber spraying sulfur, reduce adhesion and other harm. Also not easy to produce early vulcanization phenomenon. It is suitable for important rubber products such as steel cord tires, and the same amount as ordinary sulfur. 5, surface treatment sulfur: powder sulfur or precipitated sulfur is obtained by surface adhesion treatment with a treatment agent (such as polyisobutylene) that has no effect on vulcanization. It is characterized by easy mixing, good dispersion, small scorch, and large operation safety. 6, sulfur mixture: from sulfur powder and polymer or other additives mixed. Its purpose is to improve the dispersion of sulfur, to prevent the aggregation of sulfur crystallization. |
| inorganic sulfur bactericide | sulfur is an inorganic sulfur bactericide with bactericidal and acaricidal effects on wheat, melon powdery mildew has good control effect, the wolfberry Rust mite control effect is also very high. The sterilization mechanism of sulfur is to act on the electron transfer process between cytochrome B and c in the redox system, to capture electrons and to interfere with the normal "oxidation-reduction". A certain degree of fineness of sulfur powder can be directly sprayed powder, prevention and control of various crops on the powdery mildew, rust. But more is formulated into a suspension, smoke and other dosage forms, for the prevention and control of plant diseases and spider mites. It is safe for plants, but it should be used with caution in sensitive plants such as cucumber, soybean, potato, peach, plum, pear and grape, and should be avoided at noon in high temperature season. Low toxicity to humans and animals, but the powder has a certain stimulating effect on the conjunctiva and skin, almost non-toxic to bees, low toxicity to aquatic organisms. sulfur may also be used as a sulfur fertilizer. Very fine particles of sulfur in the soil after the soil microbial participation in the rapid oxidation of sulfate, absorbed by plants. In order to play the fertilizer effect in time, it should be applied early. Generally used as basal fertilizer, the application rate of 7.5~15kg per hectare. Sulfur can also be mixed into fine fertilizer soil as a slurry for rice roots. Or coated with sulfur urea particles, made of Sulfur Coated urea application. When used as alkaline earth chemical modifier, 100% sulfur is generally required to pass through 0.95 sieve, of which 50% should pass through 0.152 sieve to increase the contact surface between fertilizer and soil, speed up the conversion rate, and improve the effect of alkali removal and soil improvement. According to China's pesticide toxicity classification standard, sulfur is a low toxicity fungicide. People Daily oral 500 ~ 750mg/kg body weight without poisoning. Sulfur dust has a certain stimulating effect on the conjunctiva and skin. Low toxicity to aquatic organisms, carp and Daphnia LC50(48h) >0.1%. Almost non-toxic to bees. |
| Disinfection bactericidal action | sublimed sulfur, also known as sulfur Bloom, is in contact with skin and tissues, under the action of its secretion, sulfide is generated, which can soften the skin and kill bacteria. Sedimentation of sulfur, also known as sulfur milk, and skin contact in the role of its secretions can produce hydrogen sulfide and five sulfur sulfonic acid, sterilization, kill the role. |
| laxative effect | sulfur itself is not active, which becomes sulfide and hydrogen sulfide after oral administration, stimulating gastrointestinal mucosa and stimulating peristalsis, it caused diarrhea. This process requires the presence of an alkaline environment, E. Coli, and in particular lipolytic enzymes. In the intestinal content, when there are more fatty substances, it is easy to produce a large amount of hydrogen sulfide and cause diarrhea. High concentrations of hydrogen sulfide in the air can directly paralyze central nerve cells and cause death. |
| Elemental sulfur from Claus | the method for preparing elemental sulfur from acid gas was 1883 British Claus (C. Et al. F.Claus) was invented, called the Claus method. The method was first applied to petrochemical and natural gas chemical industry, and was not used when it was transplanted to the coking industry because of the problem of hydrogen cyanide and ammonia in the acid gas, later, Germany developed a nickel-based catalyst that specifically decomposes the above components, which allowed the Claus process to be widely used in the coking industry. The process flow of the Claus process: about one third of the hydrogen sulfide in the acid gas from the absorption desulfurization and decyanation unit is burned together with the gas in the burner at the upper part of the Claus furnace, the remaining 2/3 acid gas enters from the upper part of the Claus furnace, and undergoes catalytic reaction with sulfur dioxide generated after combustion at 1100~1150 ℃ through the aluminum oxide ball layer and the catalyst packing layer, generation of elemental sulfur and water, the reaction formula: H2S +3/2O2-→ SO2 + H2O and 2H2S + SO2-→ 3S + 2H2O. In addition, the hydrogen cyanide and ammonia contained in the acid gas are decomposed into nitrogen, hydrogen and carbon monoxide under the action of the nickel catalyst arranged in the furnace. The Reaction formula is: HCN + H2O-catalyst-→ 3/2H2 + CO +1/2N2 and NH3-catalyst-→ 3/2H2+1/2N2, the above reactions are exothermic reactions, A large amount of heat generated by the waste heat boiler to be recovered, can produce 0.5MPa saturated steam. Sulfur is condensed in the waste heat boiler and discharged into the sulfur pit through the sulfur separator and sulfur sealing tank. The hydrogen sulfide conversion of the catalytic reaction in the furnace was 60%. The process gas discharged from the waste heat boiler still contains hydrogen sulfide and sulfur dioxide. Through the first and second stage reactor and the first and second stage waste heat boiler equipped with alumina catalyst, The sulfur in hydrogen sulfide and sulfur dioxide is condensed and discharged into the sulfur pit through a second-stage sulfur separator and a sulfur-sealed tank, respectively. The 0.5MPa saturated steam generated in the first and second stage waste heat boilers is incorporated into the steam pipe network. The liquid sulfur in the sulfur pit is pumped with sulfur to the sulfur binding machine, cooled into sheet sulfur, packaged and delivered from the factory. The total conversion of hydrogen sulfide in the acid gas was 97%, and the purity of elemental sulfur produced was 99.8%. After sulfur separation, the 150~200 ℃ waste gas is discharged into the gas suction pipeline by its own pressure to prevent air pollution and recycle combustible components. The exhaust gas is a low calorific value combustible gas, and the calorific value is 2090~2512MJ/m3. Its composition (%(VOL)) is: Carbon dioxide 15.5, carbon monoxide 4, hydrogen 3.4, hydrogen sulfide 0.4, sulfur dioxide 0.2, nitrogen 45.3, water 30.8. |
| identification test | at 115 ° C., it is melted into a yellow flowable liquid, and then heated to 160 ° C., it turns black and sticky. Burning to sulfur dioxide in a blue flame. A sample of 1g was dissolved in 2ml of hot pyridine, added with 0.2 ml of sodium bicarbonate solution, and boiled to give a blue or green color. |
| content analysis | Content/%= 100-(ash content/%+ acidity/%+ organic content/%+ arsenic content/%) |
| toxicity | GRAS(FDA,§ 182.3862,2000). The lead, arsenic, selenium and thallium contained in sulfur can become volatile toxicants such as lead vapor, arsenic oxide, selenium acid, selenium acid and thallium oxide during fumigation, so the quality should be strictly controlled, and use with caution. This product is combustible, pay attention to fire prevention. See industrial sulfur for others. This product is non-toxic, flammable, sulfur dust can cause explosion. It is prone to explosion or combustion in air or mixed with oxidizing agents, see industrial sulfur for others. This product is pure sulfur, in the sampling process should be carried out in a dust-free environment. insoluble sulfur is non-toxic and flammable. Attention should be paid to fire prevention, moisture prevention and heat prevention in the yard. Special fire-fighting equipment should be provided in the warehouse, and open fire is strictly prohibited. Personnel engaged in the production, transportation, storage and processing of insoluble sulfur should use necessary protective equipment when operating. Fire can use water, sand, carbon dioxide fire extinguishing. care should be taken to avoid explosion or poisoning caused by the explosive concentration of hydrogen sulfide formed in the liquid sulfur tank space. In the recovery of sulfur produced by the processing of hydrogen sulfide and the liquid sulfur produced by the processing of natural gas, special attention should be paid to the precipitation of hydrogen sulfide. Long-term inhalation of sulfur dust, easy fatigue, Head Pain, dizziness, sweating, Sleep Initiation and Maintenance Disorders, heart pain and discomfort, indigestion. The maximum allowable concentration is 2 mg/m3. Sulfur dust explosive, 850 m particle size sulfur dust, when the concentration of more than 2.3g/m3 will be an explosion. When working, the production staff should wear work clothes, wear anti-virus masks, latex gloves. After work, you must take a shower and eat foods rich in protein. |
| usage limit | GB 2760-96 is listed as processing aid. Preserved fruit, dried fruit, dried vegetables, fans, sugar, only for fumigation. |
| purpose | is an important rubber additive, for the production of natural rubber and synthetic rubber with anti-corrosion and bleaching, China's provisions are limited to the fumigation of dried fruits, dried vegetables, fans, preserves, sugar. body cleansing, anti-dandruff and anti-itching. Long-term use can prevent skin itching, scabies, beriberi and other symptoms. natural sulfur is used for refining sulfur and manufacturing sulfuric acid, dyes and rubber products, and also used in pharmaceutical, pesticide and other industrial sectors. in the food industry for anti-corrosion, insecticide, bleaching and other fumigation. used as rubber vulcanizing agent, can also be used in the manufacture of fluorescent powder used in rubber vulcanization, the manufacture of pesticides, sulfur fertilizer, dyes, black powder, etc. used to extract sulfur used to control forest diseases used to manufacture sulfuric acid, dyes and rubber products, also used in pharmaceutical and other industrial sectors for high-purity sulfur semiconductor industry, other uses with the deposition of sulfur is widely used in household appliances, steel furniture, high-grade decoration and protection of building hardware and metal products for the prevention and control of wheat rust, powdery mildew, rice blast, fruit tree powder, peach scab and cotton, used for preparing ammonium polysulfide and alkali metal sulfide, heating a mixture of sulfur and wax to prepare hydrogen sulfide, and preparing sulfur dioxide in laboratory can treat various skin diseases, stop itching, anti-Dandruff, sterilization Disinfection for the manufacture of sulfuric acid, dyes and rubber products, but also for pharmaceutical mainly used for the preparation of II- VI compound semiconductors, optoelectronic devices, glass semiconductor elements and analysis standards. It is mainly used in the manufacture of various phosphors for TV picture tubes and other cathode ray tubes in the electronic industry, and is also an advanced chemical reagent sulfur. insoluble sulfur is mainly used in the rubber industry. When it is used as a vulcanizing agent, the surface of rubber products is not sprayed with frost, which can improve the adhesion of steel and glue. Due to the uniform distribution in the glue, the vulcanization quality can be ensured, it is the best rubber vulcanizing agent, so it is widely used in the carcass compound of tires, especially in all-wire radial tires, and can also be used in the compound of rubber products such as cables, rubber rollers, rubber shoes and the like. used in the manufacture of sulfuric acid, liquid sulfur dioxide, sodium sulfite, carbon disulfide, thionyl chloride, Chromium Oxide Green, etc. The dye industry is used for the production of sulfur dyes. It is also used in the manufacture of pesticides and fireworks. Sulfur powder is used as a vulcanizing agent for rubber, and is also used in the preparation of matches. The paper industry is used for the cooking of pulp. It is also used in metallurgy, mineral processing, smelting of cemented carbide, manufacturing of explosives, bleaching of chemical fibers and sugar, and treatment of railway pillow. |
| production method | pyrite and coal are added to a sulfur refining furnace for high-temperature roasting to sublimate sulfur, the crude sulfur is obtained by cooling, and then melted, precipitated and molded by casting to obtain a sulfur block product. Soil ammonium sulfate and crude sulfur were obtained by soaking and heating sulfur slag. The tail gas is treated by the recovery Tower and vented. Its main 7FeS2 → Fe7S8 +3S23Fe7S8+38O2 → 7Fe3O4+24SO2SO2 + C → 0.5S2 + CO2SO2 + 2CO → 0.5S2+2CO2 sulfur dioxide gas generated by boiling roasting of pyrite, after dust removal, the mixture is mixed with the blast, anthracite is added to the reduction furnace or semi-water gas is introduced for reduction, and then vented after passing through the converter, condenser and bubble column. The liquid sulfur is discharged from the condenser and the bubble column, and the sulfur product is obtained by filtration. Its main 4FeS2+11O2 → 2Fe2O3+8SO23FeS2+8O2 → Fe3O4 +6SO24Fe7S8+53O2 → 14Fe2O3+32SO2CO2 + O2 → CO2SO2 + C → CO2 +0.5S2CO2 + C → 2co2so2 + → 2CO2+2CO2 + 0.5S2C + H2O → CO + H22COS + SO2 → 1.5S2+2CO2CS2 + SO2 → 1.5S2 + CO22H2S + SO2 → 1.5S2 + 2H2O, after dust removal, it is sent to a reduction furnace, and anthracite is added to the furnace for reduction. After conversion, through the waste heat boiler, heat exchanger to the primary cooler, and then through the heat exchanger, secondary conversion, secondary cooling to the bubble column. The sulfur from the primary cooling and the exit of the bubble column is sent to the finished tank to produce a finished sulfur product. The acid gas and air are passed into the combustion furnace and the waste heat boiler by the natural gas method, and the furnace gas is passed through the first-stage condenser and the first-stage trap to the first-stage converter, then passed through the second-stage condenser and the second-stage trap to the second-stage converter, and finally passed through the third-stage condenser, vent after tertiary trap. The acid gas and the air entering the reheating furnace also enter the corresponding converters, respectively. Sulfur captured by each trap flows into a sulfur-liquid sealing tank to produce a sulfur product. Its main H2S +1.5O2 → SO2 + H2OSO2 + 2H2S → 1.5S2 + 2H2OH2S +0.5O2 → 0.7s + 0.8H2O + 0.2H2S +0.1SO22SO2 + CH4 → S2 + 2H2O + CO2 oil refinery process, the fuel gas and air are passed into the combustion furnace, and the generated furnace gas passes through the waste heat boiler, the heat exchanger, the first converter and the liquid sulfur condenser, enters into the second converter and the liquid sulfur condenser, and then passes through the flue to vent. The liquid sulfur flows out from the bottom of the heat exchanger and the liquid sulfur condenser into the liquid sulfur storage tank, and sulfur is scraped out by a scraper to prepare a sulfur product. Its reaction Formula see natural gas production of sulfur. The sulfur vapor heated above the boiling point is sprayed into the cooling medium containing the stabilizer at high speed by vaporization method, and the amorphous sulfur containing 30% insoluble in carbon disulfide can be obtained, pure insoluble sulfur with porosity can be obtained. Melting method sulfur in the state of melting and overheating, sudden cooling, A product containing a certain amount of insoluble sulfur can be obtained. Contact method hydrogen sulfide and sulfur dioxide are reacted in an aqueous medium. The superheated steam of sulfur is suddenly cooled in carbon disulfide or water. refined sulfur powder was prepared from industrial sulfur in the presence of carbon disulfide by recrystallization, vacuum distillation, grinding and sieving. Food-grade sulfur is prepared by heating industrial sulfur, adding arsenic removing agent and heavy metal removing agent, refining, grinding and sieving. The open-pit mining method is generally used for volcanic natural sulfur deposits, and the underground hydrothermal Fusion mining method is used for sedimentary and salt-type natural sulfur deposits (otherwise known as frass mining method), that is, the superheated water is injected into the sulfur-containing formation through the borehole, and the sulfur-containing liquid dissolved in the natural sulfur is transported to the ground through the pipeline, and then processed into crystalline sulfur, or directly with liquid sulfur as the product. Flotation is the main method of mineral processing. The beneficiation process of sulfur-Huangshan natural sulfur mine in Tianjun county of Qinghai province is as follows: For the tailings (sulfur content is about 15%) after extracting sulfur from natural sulfur ore, the coarse concentrate with sulfur content of 61% can also be obtained by flotation. The product is refined from natural sulfur ore, or recovered and refined from petroleum waste gas, sulfur-containing natural gas and ammonia synthesis feed gas. |
| category | pesticide |
| toxicity grade | low toxicity |
| Acute toxicity | oral-rat LD: 8437 mg/kg |
| flammability hazard characteristics | flammable; Toxic sulfur oxide gas from combustion |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored and transported separately from food raw materials |
| extinguishing agent | sand, water |
| spontaneous combustion temperature | 450 F &_& 450 F |
