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Send EmailAluminum Hydroxide, Aluminium hydrate, 21645-51-2
CAS: 21645-51-2
Molecular Formula: AlH3O3
Names and Identifiers
| Name | Aluminum hydroxide |
| Synonyms | alugel alumigel alcoac333 alcoac330 alcoac30bf C.I. 77002 aluminicacid aluminahydrated Aluminiumhydrate Aluminium hydrate Aluminum hydroxide Alumina trihydrate Aluminium Hydroxide aluminum trihydrate Aluminum hydroxide, dried [JAN] |
| CAS | 21645-51-2 |
| EINECS | 244-492-7 |
| InChI | InChI=1/Al.3H2O/h;3*1H2/q+3;; |
Physico-chemical Properties
| Molecular Formula | AlH3O3 |
| Molar Mass | 78 |
| Density | 2.42 g/cm3 at 20 °C |
| Melting Point | 300℃ |
| Boling Point | 2980℃[at 101 325 Pa] |
| Water Solubility | insoluble |
| Solubility | Soluble in mineral acid and alkaline aqueous solution, insoluble in water. |
| Appearance | White powder |
| Specific Gravity | 2.42 |
| Color | White |
| Odor | Odorless |
| Exposure Limit | ACGIH: TWA 1 mg/m3 |
| Solubility Product Constant(Ksp) | pKsp: 32.89 |
| Merck | 14,342 |
| PH | 8-9 (100g/l, H2O, 20℃)(slurry) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Incompatible with strong bases. |
| Sensitive | Easily absorbing moisture |
| MDL | MFCD00003420 |
| Physical and Chemical Properties |
properties white crystalline powder. melting point 300 °c (loss of water) relative density 2.42 solubility insoluble in water and alcohol, soluble in inorganic acid and sodium hydroxide solution. |
| Use | Used for waterproof fabric, ink, glassware, paper filler, mordant, water purification agent, also used in aluminum salt, Lubricant Manufacturing |
Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36 - Irritating to the eyes |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | - |
| RTECS | BD0940000 |
| TSCA | Yes |
| HS Code | 28183000 |
| Toxicity | TDLo oral in child: 79gm/kg/2Y-I |
Upstream Downstream Industry
| Raw Materials | Sodium carbonate Sulfuric acid Sulfuric acid Aluminum sulfate Aluminum sulfate Aluminum Aluminum Aluminum Sodium aluminate Sodium aluminate Calcium carbonate Ammonium Bicarbonate Ammonium Bicarbonate |
| Downstream Products | Aluminum sulfate Sulfuric acid, aluminum ammonium salt (2:1:1) Aluminum chloride hexahydrate Aluminium dihydrogen phosphate aluminum phosphate Aluminum fluoride Aluminum oxide |
Nature
White amorphous powder, tasteless. Practically insoluble in water and ethanol. When heated to 300 °c, water was lost to oxide. The relative density was 2. 42. Melting point 300 °c (loss of water). Insoluble in water and alcohol, soluble in hydrochloric acid, H2 S04 and other inorganic acids and sodium hydroxide solution. Aluminum hydroxide gel is a white viscous suspension colloid, static can precipitate a small amount of water.
Preparation Method
aluminum sulfate was dissolved in water and filtered. Injection of hydrogen and sodium chloride in hot water solution, slow filtration. Another ammonium carbonate was dissolved in water, carbon dioxide was introduced to saturation, and filtered. This solution was added to the above solution. Aluminum hydroxide was then precipitated.
Standard
This product is a mixture of aluminum hydroxide as the main component, can contain a certain amount of carbonate, containing aluminum hydroxide [Al(OH)3] not less than 76.5%.
Trait
- This product is white powder; Odorless.
- This product is insoluble in water or ethanol; Dissolved in dilute inorganic acid or sodium hydroxide solution.
Introduction
No smell, no smell. Can absorb acid and carbon dioxide. When heated to 300 ℃, it loses water to form alumina. The minimum lethal dose (rat, abdominal cavity) is 150mg/kg.
Use
Analytical reagents. It is used to determine the potassium content of potassium fertilizer, ink, glassware, adsorbent, paper filler, mordant, water purifying agent, aluminum salt, lubricant manufacturing, etc.
Differential diagnosis
take about 0.5g of this product, Add 10ml of dilute hydrochloric acid, heat and dissolve, show the identification reaction of aluminum salt (General rule 0301).
Safety
rats were injected intraperitoneally with LDsa:150mg.kg-1. The allowable concentration of aluminum hydroxide was 6mg.m-3. In the workplace with high dust content, wear gas masks, protective glasses and dust-proof work clothes to protect the skin and eyes.
Exam
Acid Control Force
take this product about 0.12g, precision weighing, set 250ml plug Erlenmeyer flask, precision plus hydrochloric acid titration solution (O.lmol/L) 50ml, packed, continuously shake at 37 ℃ for 1 hour, let it cool, add 6~8 drops of bromophenol blue indicator solution, and use sodium hydroxide titration solution (O.lmol/L) titration. The consumption of hydrochloric acid titrant (0.1 mol/L) per lg should not be less than 250ml.
alkali metal carbonate
take 0.20g of this product, Add 10ml of fresh boiling cold water, mix well, filter, add 2 drops of phenolphthalein indicator solution to the filtrate; If pink, add hydrochloric acid titration solution (0.1 mol/L)0.10, pink should disappear.
chloride
take 0.10g of this product, add 6mL of dilute nitric acid, boil and dissolve, let it cool, dilute it to 20ml with water, and filter it. Take 5ml of filtrate and check it according to law (General rule 0801), with standard sodium chloride solution 5.0ml of the control solution should not be more concentrated (0.2%).
sulfate
take 0.10g of this product, add 3ml of dilute hydrochloric acid, boil and dissolve, let it cool, dilute it to 50ml with water, filter it, take 25ml of filtrate, and check it according to law (General rule 0802), with standard potassium sulfate solution 5.0ml of the control solution should not be more concentrated (1.0%).
cadmium
take two 0.50g portions of this product, add 4ml nitric acid in one portion, boil and dissolve it, let it cool, transfer it to 50ml measuring flask quantitatively, dilute it to the scale with water, shake it well, filter it, take the continued filtrate as the test solution; The other part of the Precision Plus standard cadmium solution (precise quantity of cadmium single element standard solution appropriate amount, quantitative dilution with water to make cadmium l per 1 ml. Oug solution) 1 ml, the same method of operation, take the filtrate as a control solution. According to Atomic Absorption Spectrophotometry (General rule 0406 second method), at the wavelength of 228.8nm were measured, should comply with the provisions (0.0002%).
Mercury
take this product l. Add 4ml of hydrochloric acid to one portion, then add 25ml of water and 0.5ml of 5% potassium permanganate solution, 5% hydroxylamine hydrochloride solution was added dropwise until the purple color disappeared. The solution was diluted with water to scale, mixed well, filtered, and the continued filtrate was taken as the test solution; another medium-Precision Plus standard mercury solution (a proper amount of mercury single element standard solution is accurately measured and diluted quantitatively with water to make a solution containing 2.0ug of mercury per lml), which is operated in the same method, the filtrate was taken as a control solution. According to Atomic Absorption Spectrophotometry (General rule 0406 second method), at the wavelength of 253.6nm were measured, should comply with the provisions (0.0002%).
Heavy metals
take this product l. Add 5ml hydrochloric acid, water bath evaporation to dryness, then add water 5ml, stir, continue to evaporate to nearly dry, stirred to dry powder, add acetate buffer (pH 3.5)2ml of water and 10ml of water shall be dissolved at a slight temperature, filtered, and the filtrate shall be added with an appropriate amount of water to make 25ml, which shall be checked according to law (General rule 0821 Law 1), and the content of heavy metals shall not exceed 30 parts per million.
arsenic salt
take 0.20g of this product, add 0822 of dilute sulfuric acid, boil, cool, add 5ml of hydrochloric acid and an appropriate amount of water to make, and check according to law (General Principles first law), the provisions (0.001%) shall be met.
Content determination
take about 0.6g of this product, weigh it accurately, Add 10ml of hydrochloric acid and 10ml of water, boil and dissolve it, let it cool, transfer it quantitatively to a 250ml measuring flask, dilute it with water to the scale, shake well; Take 25ml with precision, neutralize with ammonia test solution to precipitate precipitate, add dilute hydrochloric acid Dropwise until the precipitate is dissolved, and add 10ml of acetic acid-ammonium acetate buffer (pH 6.0), then add 25ml of ethylenediamine tetraacetic acid disodium titration solution (0.05mol/L), boil for 3-5 minutes, let it cool, add 1 ml of Xylenol Orange indicator solution, and use zinc titration solution (0.05mol/L). The titration occurred until the solution turned from yellow to red and the results of the titration were corrected for a blank test. Each 1 ml of ethylene diamine tetraacetic acid disodium titration solution (0.05mol/L) is equivalent to 3.900mg of Al( OH )3.
Category
antacids.
Storage
sealed storage.
Aluminium hydroxide tablets
each tablet of this product contains aluminum hydroxide [Al(OH)3] not less than 0.207g.
trait
This product is white tablet.
identification
- take the fine powder of this product (about equivalent to l.Og of aluminum hydroxide) and place it in a plug conical flask with a glass tube. The tip of the glass tube is immersed in a test tube containing calcium hydroxide solution. 10ml of hydrochloric acid solution (3mol/L) was added to the Erlenmeyer flask, immediately stoppage and shaking, and gas was generated in the Erlenmeyer flask and precipitate was generated in the test tube.
- the residual solution in the above Erlenmeyer flask was taken, filtered, and the filtrate was subjected to identification reaction of aluminum salt (General rule 0301).
examination
- acid-making power precise weighing an appropriate amount of fine powder of this product (equivalent to about 0.15g of aluminum hydroxide), placing it in a 250ml plug Erlenmeyer flask, and precision adding hydrochloric acid titration solution (0.1 mol/L)50ml, packed, continuously shaking at 37°C for 1 hour, cooling, adding 6-8 drops of bromophenol blue indicator solution, and titrating with sodium hydroxide solution (0.lmol/L) titration. Consumption of hydrochloric acid titrant (0.lmol/L) per tablet should not be less than 60ml.
- In addition to not checking the disintegration time, the relevant provisions under the item of tablets (General rule 0101) should be met.
Content determination
Take 20 tablets of this product, precision weighing, fine grinding, precision weighing an appropriate amount (about 0.6g equivalent to aluminum hydroxide), add hydrochloric acid and water each 10ml, boil and dissolve, cool, the filtrate was placed in a 250ml measuring flask, and the filter was washed with water. The washing solution was mixed with a human measuring flask, diluted with water to a scale, and shaken. According to the method under the item of aluminum hydroxide content determination, the same method was used for the determination from "take 25ml with precision, add ammonia test solution and just precipitate precipitate. Each 1 ml of ethylene diamine tetraacetic acid disodium titration solution (0.05mol/L) is equivalent to 3.900mg of Al(OH)3.
category
Same as aluminum hydroxide.
specification
0.3g
storage
sealed and stored in a dry place.
Aluminium hydroxide gel
This product is colloidal small particles of aluminum hydroxide dispersed in water to form a suspension gel. The aluminum hydroxide-containing [Al(OH)3] should be 5.50% to 6.75%(g/g). This product can be added to the amount of flavor and preservatives.
trait
This product is a white viscous suspension type gel liquid; Static, can precipitate a large amount of water; Red or blue litmus test paper are slightly reactive, when the phenolphthalein indicator liquid does not show red.
identification
- 5g of the product was taken and placed in a plug Erlenmeyer flask with a glass tube. The tip of the glass tube was immersed in a test tube containing calcium hydroxide solution. 10ml of hydrochloric acid solution (3mol/L) was added to the Erlenmeyer flask, immediately stoppage and shaking, and gas was generated in the Erlenmeyer flask and precipitate was generated in the test tube.
- the residual solution in the above Erlenmeyer flask was taken, filtered, and the filtrate was subjected to identification reaction of aluminum salt (General rule 0301).
examination
- the pH value should be 5.5 to 8.0 (General 0631).
- acid making power take about 1.5g of this product, weigh it accurately, put it in a 250ml plug Erlenmeyer flask, and add hydrochloric acid titration solution accurately (0.1 mol/L)50ml, packed, shaking at 37°C for 1 hour, adding 6-8 drops of bromophenol blue indicator solution, and titrating with sodium hydroxide solution (O.lmol/L) titration. The consumption of hydrochloric acid titrant (0.1 mol/L) per 1g should be 12.5-25.0 ml.
- chloride take 0.40g of this product, add 6mL of dilute nitric acid, boil, dissolve, cool, dilute to 50ml with water, filter; Take 25ml of filtrate, check according to law (General rule 0801), with standard sodium chloride solution 7.0ml of the control solution should not be more concentrated (0.035%).
- sulfate take this product l. Add 1 ml of dilute hydrochloric acid, boil, dissolve, cool, dilute to 50ml with water, filter; Take 20ml of filtrate, check according to law (General rule 0802), and standard potassium sulfate solution 5.0ml of the control solution should not be more concentrated (0.125%).
- Take 5.0g of heavy metal, add 5ml of hydrochloric acid, dry on a water bath, add 5ml of water, stir, continue to evaporate to near dryness, stir to make dry powder, add 2ml of acetate buffer solution (pH3.5) and 10ml of water, dissolve at a slight temperature, filter, add an appropriate amount of water to the filtrate to make 25ml, and check according to law (General Principles 0821, Law 1), heavy metals should not exceed 5 parts per million.
- arsenic salt take 2.5g of this product, add 0822 of dilute sulfuric acid, boil it, let it cool, add of hydrochloric acid and an appropriate amount of water to make it, and check it according to law (general rule, law 1), the provisions (0.00008%) shall be met.
- others shall comply with the relevant provisions under the item of gel (General rule 0114).
Content determination
take about 8g of this product, precision weighing, according to the method under the determination of aluminum hydroxide content from the "hydrochloric acid and water 10ml, boiling dissolved after", the same method for determination. Each 1 ml of ethylene diamine tetraacetic acid disodium titration solution (0.05mol/L) is equivalent to 3.900mg of Al(OH)3.
category
Same as aluminum hydroxide.
storage
seal, anti-freeze storage.
Compound aluminum hydroxide tablets
each piece of this product contains aluminum oxide [Al(OH)3] not less than 0.177g; Magnesium silicate containing magnesium oxide (MgO) calculation, not less than 0.020g.
prescription
aluminum hydroxide 245g
Magnesium disilicate 105g
Belladonna liquid extract 2.6ml
Made into 1000 tablets
trait
This product is white tablet.
identification
- take an appropriate amount of fine powder of this product (about 6 tablets), add dilute hydrochloric acid 30ml, slightly warm, filter, and test the filtrate according to the following method.
- 4ml of the above filtrate was taken, and ammonia test solution was added to make it alkaline, that is, a white colloidal precipitate was generated; A few drops of sodium alizarin sulfonate indicated solution were added, and the precipitate was noted to be cherry red.
- take 4ml of the above filtrate, add sodium hydroxide solution to make it alkaline, that is, generate white colloidal precipitate; Add 3ml of sodium hydroxide solution, partially dissolve the precipitate, filter, wash the precipitate with water, add iodine solution, that is red-brown.
- Take 20ml of the above filtrate, add ammonia solution to make it alkaline, extract with diethyl ether, combine the diethyl ether solution, and add 3-4 drops of fuming nitric acid to the residue after the diethyl ether volatilizes, the mixture was evaporated to dryness on a water bath and allowed to cool. One small pellet of potassium hydroxide was added, and a few drops of anhydrous ethanol were added, which turned purple.
examination
- acid preparation the appropriate amount of fine powder under the content determination item (about 1/4 tablet) is accurately weighed and placed in a 250ml plug Erlenmeyer flask, and hydrochloric acid titration solution (0.lmol/L)50ml, packed, continuously shaking at 37°C for 1 hour, let it cool, add 0.5ml of bromophenol blue indicator solution, and use sodium hydroxide titration solution (0.1 mol/L) to titrate the remaining hydrochloric acid. Consumption of hydrochloric acid titrant (0.lmol/L) per tablet should not be less than 60ml.
- other than the disintegration time should be in hydrochloric acid solution (9-1000) within 10 minutes of all disintegration and through the screen, other items should be consistent with the provisions under the tablet (General 0101).
Content determination
- 20 tablets of aluminum hydroxide, precision weighing, fine grinding, precision weighing suitable children (about 1/4 tablets), add 2ml hydrochloric acid and 50ml water, boil, cool, filter, and wash the residue with water; Combine the filtrate and the wash solution, add the ammonia test solution Dropwise to precipitate the appropriate precipitate, add dilute hydrochloric acid Dropwise to dissolve the precipitate, add acetic acid-ammonium acetate buffer (pH 6.0) precision Add ethylenediamine tetraacetic acid disodium titration solution (0.05mol/L)25ml, boil for 10 minutes, let cool, add Xylenol Orange indicator solution 1ml, with zinc titration solution (0.05mol/L) the titration was carried out until the solution changed from yellow to red and the results of the titration were corrected by a blank test. Each 1ml of ethylene diamine tetraacetic acid disodium titration solution (0.05mol/L) is equivalent to 3.900mg of Al(OH)3.
- magnesium oxide precision weigh appropriate amount of the above fine powder (about 1 tablet), add 5ml of hydrochloric acid and 50ml of water, heat and boil, add 1 drop of Methyl red indicator solution, ammonia Test Solution was added dropwise to change the solution from red to yellow. The solution was boiled for 5 minutes, filtered while hot, and the filter residue was washed with 30% ammonium chloride solution 30ml, 10ml of ammonia test solution and 5ml of triethanolamine solution (1-2) were added, a small amount of chrome black butyl indicator was added, and the solution was titrated with ethylenediamine tetraacetic acid disodium titration solution (0.05mol/L) to a clear blue color. Each 1 ml of ethylene diamine tetraacetic acid disodium titration solution (0.05mol/L) is equivalent to 2.015mg of MgO.
category
antacids.
storage
sealed and stored in a dry place.
Reference Information
| pH indicator color change ph range | >7 |
| overview | aluminum hydroxide (Aluminium hydroxide), chemical formula Al(OH)3, white solid, insoluble in water, soluble in acid or alkali, is a typical amphoteric hydroxide. It can be converted into alumina after being heated and dehydrated in air, which is of great significance to alumina production. Aluminum hydroxide can react with acids to form salt and water and can react with strong bases to form salt and water, so it is an amphoteric hydroxide. Because it is also acidic, it can also be called aluminic acid (H3AlO3). But what actually reacts with alkali is tetrahydroxyaluminate ([Al(OH)4]-). Therefore, it is usually regarded as metaaluminic acid monohydrate (HAlO2 · H2O), which is divided into industrial grade and pharmaceutical grade according to its purpose. Aluminum hydroxide is a chemical product with a wide range of uses. Industrial-grade aluminum hydroxide is mainly used as a filler for plastics and polymers, a flame retardant and binder for blanket making, a filler for epoxy resin, and a color filler for papermaking Agent and coating, the production of aluminum sulfate, alum, aluminum fluoride, sodium aluminate, synthetic molecular sieve, the production of toothpaste filler, glass ingredients, its gel liquid and dry gel. Pharmaceutical-grade aluminum hydroxide is mainly used as an acid-making medicine. It has the effect of neutralizing gastric acid and protecting the ulcer surface. It can relieve the symptoms of excessive gastric acid and combined acid reflux. It is suitable for gastric ulcers and twelve-finger ulcers. Treatment of reflux esophagitis and upper gastrointestinal bleeding. When combined with calcium and vitamin D, it can be used to treat neonatal hypocalcemia (tetany). |
| preparation method | 1. industrial production method industrial production method mainly includes Bayer method and sintering method. (1) Of the bauxite produced annually by Bayer process in the world, alumina is 97% treated by Bayer process. The Bayer method includes two main processes: heat treatment of bauxite with caustic soda solution, so that the alumina in the ore generates sodium metaaluminate, that is: then the cooled sodium aluminate solution is decomposed by stirring, and then filtered and separated to obtain Aluminum hydroxide product, that is: the decomposed caustic soda can be recycled. (2) Sintering method In industrial aluminum production, the sintering method is suitable for high-silicon bauxite, namely Al2O3/SiO2<7. The steps of the sintering method include the following aspects: First, the bauxite and sodium carbonate solution are mixed in a certain proportion for sintering, that is: Secondly, the sintered bauxite is then leached into sodium aluminate; That is: Finally, CO2 gas is introduced into the sodium aluminate solution to generate aluminum hydroxide. At the same time, caustic soda is converted into sodium carbonate, which can be reused in the sintering process. That is: 2. The aluminum hydroxide synthesized by hydrothermal method has high purity, small particle size, uniform distribution, easy control of crystal form and simple operation. Therefore, it is widely used in the process of synthesizing aluminum hydroxide. Sol-gel method Sol-gel method is a commonly used method for preparing ultrafine aluminum hydroxide. The most common sol-gel method to prepare aluminum hydroxide is to hydrolyze aluminum salt and alkoxide in water. The mechanism is divided into two steps:-OR group is first hydrolyzed to produce-OH, and then aluminum hydroxide is precipitated in the form of precipitation. 4. Carbon method Carbon method is to introduce CO2 gas into sodium metaaluminate solution, precipitate aluminum hydroxide, and control the size and morphology of the product by adjusting pH value and CO2 concentration. Microemulsion method Microemulsions are usually composed of surfactants, cosurfactants, solvents and water (or aqueous solutions). Microemulsion has ultra-low interfacial tension and high solubilization ability. The preparation of nanomaterials by microemulsion technology can accurately control the crystal growth process of nanomaterials, and the microemulsion ball encapsulates the crystal particles, effectively preventing the agglomeration of nanoparticles. |
| application | 1. chemical raw materials because aluminum hydroxide can be produced on a large scale, the raw materials are sufficient, the product has high purity, and is easily soluble in acid and alkali. Therefore, aluminum hydroxide is an important raw material for the preparation of aluminum salts, such as barium aluminate, aluminum sulfate, etc. 2. Flame retardant aluminum hydroxide powder is usually regarded as an ideal flame retardant filler for plastics, unsaturated polyester, rubber and other organic polymers because of its filling, flame retardant, smoke suppression functions and non-toxic and harmless. Flame retardant mechanism of aluminum hydroxide: when the temperature exceeds 200 ℃, aluminum hydroxide begins to endothermically decompose and release three crystal water, with the highest decomposition rate at about 250 ℃. That is, this reaction is a strong endothermic reaction, thereby inhibiting the increase of the polymer temperature, reducing its decomposition rate, and only generating water vapor, does not generate toxic and harmful gases. 3. Ceramic aluminum hydroxide is calcined at high temperature to obtain alumina, and alumina has high thermal chemical stability, thermal strength, creep resistance, dielectric properties and low thermal expansion coefficient, and is an important material for synthetic ceramics. In the ceramic synthesis process, aluminum hydroxide activates and controls the crystallization process, so as to control the phase formation of the composite material. 4. Sewage treatment Aluminum hydroxide is mainly Al(OH)4-in water, which can precipitate toxic heavy metals in sewage by coprecipitation and then filter to achieve the effect of water purification. Aluminum hydroxide has a high specific surface area, which can adsorb colloids, suspended solids, dyes, and organic matter in sewage on the surface. 5. Pharmaceutical aluminum hydroxide can neutralize gastric acid and is non-toxic and harmless. It is a traditional good medicine for treating gastric diseases. The use of aluminum hydroxide as a adjuvant can improve the immunogenicity of the vaccine. Its mechanism of action is to adsorb the antigen on the surface of aluminum hydroxide to allow it to be released slowly to achieve the effect of prolonging the efficacy. 6. In the preparation process of aluminum hydroxide, target products with different specific surface area, pore volume, pore structure and crystal structure are prepared by controlling the temperature, concentration and pH of reactants, which can be effectively used as catalyst carrier for hydrogenation of unsaturated carbonyl compounds and preparation of fullerenes. 7. Aluminum hydroxide in paper industry has high whiteness, ultra-fine particle size, complete crystal form, and strong compatibility with whitening agent. Using it as an additive for coatings and resins can effectively improve the whiteness, opacity, smoothness and inking of coated paper. |
| solubility in water (g/100ml) | dissolved grams per 100ml of water: 0.0001g/20 ℃ |
| toxicity | the toxic effect of aluminum is to mechanically stimulate lung tissue; The second is to precipitate protein and form fibrous irreversible protein compounds without inflammatory manifestations. Inhalation of aluminum dust mainly damages the lungs, called bauxite lungs; chronic symptoms include weight loss, easy fatigue, dyspnea, and cough. Alveolar epithelial hyperplasia was caused more obviously by aluminum hydroxide than by aluminum. The maximum allowable concentration is 6 mg/m3. Small mouth wounds can be treated with alcohol and gasoline first, and then covered with non-toxic dressings; large wounds can be removed and sutured, with sulfa preparations and penicillin therapy. In places with high dust content, gas masks, protective glasses and dust-proof overalls should be worn to protect skin and eyes. Regular medical examinations should be conducted once a year. |
| use | used to make waterproof fabric, ink, glass, paper filler, mordant, water purifier, various aluminum salts, etc. widely used in plastics, rubber, resins, coatings, paints, etc. supporting catalysts, separating vapor and liquid used in petroleum, chemical industry, chemical fertilizer, natural gas and environmental protection industries, the main function is to increase the distribution point of gas or liquid, support and protect the catalyst with low strength used as mordant and analytical reagent used as a thickener for ink. It is the raw material for the manufacture of aluminum salt, enamel, ceramics, glassware and lubricants. It is also used to make various catalyst supports. Aluminum hydroxide gel is suitable for duodenal ulcer, gastric ulcer and hyperacidity. In addition, it is also used for waterproof fabric, paper filler, mordant and water purifier. printing ink, painting pigment, crayon, rubber filler. used for waterproof fabric, ink, glassware, paper filler, mordant, water purification agent, also used for aluminum salt, lubricant manufacturing, etc. gravimetric method to determine the content of potash fertilizer. Adsorbent, emulsifier, ion exchanger, chromatographic analyzer, mordant. Refractory materials, glass, pottery. Precipitated pigment, waterproof fabric. Make aluminum salt. |
| production method | in aluminum sulfate solution, alkali solution is added under stirring to generate precipitate, washed, filtered and dried at low temperature, and then crushed to obtain finished product. The dehydrated paste can also be directly used as a product. The concentration, temperature, reaction temperature control and drying temperature of the solution in the preparation affect the product quality. The ammonium bicarbonate method combines sulfuric acid with aluminum powder or aluminum ash to generate aluminum sulfate, and then metathesis with ammonium bicarbonate to obtain aluminum hydroxide. Its 2Al(OH)3 3H2SO4 → A12(SO4)3 6H2OA12(SO4)3 6NH4HCO3 → 2AI(OH)3 3(NH4)2SO4 6CO2 = sodium aluminate caustic soda reacts with aluminum ash at a ratio of 2:1 above 100 ℃ to obtain sodium aluminate solution. Sulfuric acid and aluminum ash react at 110 ℃ in a ratio of 1.25:1 to prepare aluminum sulfate solution. Then the sodium aluminate solution and aluminum sulfate solution are neutralized to pH6.5 to generate aluminum hydroxide precipitate, which is washed with water, filtered by pressure, dried at 70~80 ℃ for 12 hours, and then crushed to obtain aluminum hydroxide finished product. Its A12O3 2NaOH → 2NaAO2 H2OAl2O3 3H2SO4 → A12(SO4)3 3H2O6NaIAO2 A12(SO4)3 12H2O → 8Al(OH)3 ↓ 3Na2SO4 recovery method dissolves the recovered aluminum trichloride with water, decolorizes with activated carbon and filters to remove impurities, then reacts with sodium carbonate to generate aluminum hydroxide, which is filtered, washed and dried to obtain aluminum hydroxide products. Its 2A1C13 3Na2CO3 3H2O → 2AI(OH)3 ↓ 6NaCl 3CO2 ↑ |
| category | toxic substances |
| toxicity classification | highly toxic |
| acute toxicity | abdominal cavity-rat LD50: 150 mg/kg |
| storage and transportation characteristics | warehouse ventilation and low temperature drying |
| fire extinguishing agent | dry powder, foam, sand, carbon dioxide; mist water |
| occupational standard | TWA 2 mg (aluminum)/m3 |
