
Aluminum Hydroxide CAS 21645-51-2


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- Appearance: White powder
- Purity: 99. 0%min
- Stock: In stock
- Sample: Available
- Zhishang Chemical: Aluminum Hydroxide Supplier & Manufacturer
Aluminum Hydroxide: The Complete Guide
- Item 1: Basic Info of Aluminum Hydroxide
- Item 2: What is Aluminum Hydroxide?
- Item 3: Aluminum Hydroxide Uses
- Item 4: The Manager has Something to Say
- Item 5: Application of Aluminum Hydroxide
- Item 6: Preparation of Aluminum Hydroxide
- Item 7: Quality Control of Aluminum Hydroxide
- Item 8: Hot Sale Products
- Item 9: Get Aluminum Hydroxide Quotation
Aluminum Hydroxide for Sale
Basic Info of Aluminum Hydroxide
Chemical Name: | Aluminum Hydroxide |
Other Name: | Dried Aluminium Hydroxide; Aluminum hydroxide magnesium hydroxide; Aluminum hydroxide otc; Alu hydroxide |
CAS: | 21645-51-2 |
EINECS: | 244-492-7 |
Type: | Pharmaceutical raw materials; Inorganic salt |
Molecular Formula: | AlH3O3 |
Molecular Weight: | 78 |
Melting point | 300℃ |
density | 2.42 g/cm3 at 20 °C |
vapor pressure | <0.1 hPa (20 °C) |
storage temp. | Store at +5°C to +30°C. |
solubility | 0.0015g/l |
form | colloidal suspension |
Specific Gravity | 2.42 |
color | White |
Odor | Odorless |
Water Solubility | insoluble |
Solubility Product Constant (Ksp) | pKsp: 32.89 |
Stability: | Stable. Incompatible with strong bases. |
Brand Name: | Zhishang Chemical |
Provide: | Aluminum Hydroxide MSDS; Aluminum Hydroxide COA |
What is Aluminum Hydroxide?
Aluminum hydroxide (Aluminiumhydroxide), chemical formula Al(OH)3, white solid, insoluble in water, soluble in acid or alkali, is a typical amphoteric hydroxide. After it is heated and dehydrated in the air, it can be converted into alumina, which is of great significance to the production of alumina.
Aluminum hydroxide can react with acid to form salt and water, and can react with strong base to form salt and water, so it is an amphoteric hydroxide. Because of its certain acidity, it can also be called aluminate (H3AlO3). However, what is actually formed when it reacts with a base is tetrahydroxyaluminate ([Al(OH)4]-). Therefore, it is usually regarded as metaaluminate monohydrate (HAlO2·H2O), which is divided into two types: industrial grade and pharmaceutical grade.
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 a binder for carpet making, a filler for epoxy resin, and a color filler for papermaking. And coatings, production of aluminum sulfate, alum, aluminum fluoride, sodium aluminate, synthetic molecular sieves, production of fillers for toothpaste, ingredients for glass, its gel liquid and dry gel. Pharmaceutical grade aluminum hydroxide is mainly used as an antacid, which has the effect of neutralizing gastric acid and protecting the ulcer surface, and can relieve the symptoms of acid reflux caused by excessive gastric acid. It is suitable for gastric ulcer and duodenal ulcer, reflux disease Treatment of esophagitis and upper gastrointestinal bleeding. When used in combination with calcium and vitamin D, it can treat neonatal hypocalcemia (tetany).
Aluminum Hydroxide Uses
- Aluminum hydroxide is widely used in plastic, rubber, resin, paint, paint, etc.
- Aluminum hydroxide is used in petroleum, chemical, fertilizer, natural gas and environmental protection industries. Its main function is to increase the distribution point of gas or liquid, and to support and protect catalysts with low strength.
- Aluminum hydroxide is used as a thickener for inks. It is a raw material for the manufacture of aluminum salts, enamels, ceramics, glassware and lubricants. Also used in the preparation of various catalyst supports. Aluminum hydroxide gel is suitable for duodenal ulcer, gastric ulcer and hyperacidity embolism. In addition, it is also used in waterproof fabrics, paper fillers, mordants, and water purifiers.
- Aluminum hydroxide is used for waterproof fabrics, inks, glassware, paper fillers, mordants, water purifiers, and also for the gravimetric determination of potash fertilizers in the manufacture of aluminum salts and lubricants. Adsorbent, emulsifier, ion exchanger, chromatographic analysis agent, mordant. Refractory, glass, pottery. Precipitated pigment, waterproof fabric. Manufacture of aluminum salts.
The Manager has Something to Say

This is William, CEO of Zhishang Chemical Co., Ltd.
Welcome to visit our factory . As the top chemical manufacturer, we have been striving for product quality, innovation , R&D, and customer service for the past 7 years. In the next 10 years or even longer, we are committed to becoming the most reliable chemical supplier in the world , creating a well-known international brand trusted by customers, with the spirit of “one meter wide, ten thousand meters deep”, we continue to focus on product research and development, continue to focus on customer service, continue to improve the supply chain service system, to create a professional chemical supply service team, to achieve win-win long-term cooperation. Please feel free to contact us if you have any questions.
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Application of Aluminum Hydroxide
Aluminum hydroxide powder is generally regarded as an ideal for plastics, unsaturated polyesters, rubber and other organic polymers because of its filling, flame retardant and smoke suppression functions, and it is non-toxic and harmless. flame retardant filler. Flame retardant mechanism of aluminum hydroxide: when the temperature exceeds 200 ℃, aluminum hydroxide begins to endothermic decomposition and releases three crystal waters, and its decomposition rate is the largest at about 250 ℃. which is:
2Al(OH)3 → Al2O3 + 3H2O↑
This reaction is a strong endothermic reaction, thereby inhibiting the rise of the polymer temperature, reducing its decomposition rate, and only producing water vapor, no toxic and harmful gases. Therefore, the flame retardant mechanism can be summarized as follows: 1) Endothermic effect. Dehydration endothermic at 300-350 ℃, inhibiting the temperature rise of the polymer; 2) dilution. ATH filling reduces the concentration of flammable polymers. The water vapor released by ATH dehydration dilutes the concentration of combustible gas and oxygen, which can prevent combustion; 3) Covering effect. After ATH is dehydrated, an Al2O3 protective film is formed on the surface of the combustible material to isolate oxygen and prevent continued combustion; 4) Carbonization. Flame retardants produce strong dehydrating substances under burning conditions, which carbonize plastics and are less likely to produce flammable volatiles, thereby preventing the spread of flames.
Because aluminum hydroxide can be produced on a large scale, the raw materials are sufficient, the product purity is high, and it is easily soluble in acid and alkali. Therefore, aluminum hydroxide is an important raw material for preparing aluminum salts, such as barium aluminate, aluminum sulfate, etc.
Aluminum hydroxide is calcined at high temperature to obtain alumina, and alumina has high thermochemical stability, thermal strength, creep resistance, dielectric properties and low thermal expansion coefficient, and is an important material for synthetic ceramics . During ceramic synthesis, aluminum hydroxide activates and controls the crystallization process, thereby achieving control over the phase formation of the composite.
Aluminum hydroxide is mainly composed of Al(OH)4- in water, which can precipitate toxic heavy metals in sewage by co-precipitation 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, organics, etc. in sewage on the surface.
Aluminum hydroxide can neutralize gastric acid, and is non-toxic and harmless. It is a traditional good medicine for the treatment of gastric diseases. The use of aluminum hydroxide as an adjuvant can also improve the immunogenicity of the vaccine. Its mechanism of action is to adsorb the antigen on the surface of aluminum hydroxide and release it slowly to prolong the efficacy of the vaccine.
During the preparation process, aluminum hydroxide can prepare target products with different specific surface areas, pore volumes, pore structures and crystal structures by controlling the temperature, concentration and pH of the reactants. It can be effectively used as a catalyst carrier for Hydrogenation of unsaturated carbonyl compounds, preparation of fullerenes, etc.
Aluminum hydroxide has high whiteness, ultra-fine particle size, complete crystal form, and strong compatibility with brighteners. Using it as an additive for coatings and resins can effectively improve the whiteness, opacity, smoothness and ink adhesion of coated paper.
Preparation of Aluminum Hydroxide
- Bayer method: 97% of the bauxite ore produced every year in the world is processed by the Bayer method to obtain alumina. The Bayer process consists of two main processes: heat treatment of bauxite with a caustic soda solution to produce sodium metaaluminate from the alumina in the ore, namely:
Then, the cooled sodium aluminate solution is decomposed by stirring, and then filtered and separated to obtain an aluminum hydroxide product, that is, - Sintering method: In industrial aluminum production, the sintering method is suitable for high-silicon bauxite, that is, 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, namely:
Secondly, the sintered bauxite is prepared into sodium aluminate by leaching with sodium carbonate solution; namely:
Finally, CO2 gas is passed into the sodium aluminate solution to generate aluminum hydroxide.
The aluminum hydroxide synthesized by the hydrothermal method has high purity, small particle size, uniform distribution, easy control of crystal shape, and simple operation. Therefore, it is widely used in the process of synthesizing aluminum hydroxide. Using aluminum isopropoxide as the main raw material, it was mixed with distilled water in a molar ratio of 1:100 to make it hydrolyzed. Heat treatment, and then cooling and centrifuging to obtain nano aluminum hydroxide. The prepared aluminum hydroxide product is a typical boehmite flake structure with a particle size of about 10 nm.
The sol-gel method is currently a commonly used method for the preparation of ultrafine aluminum hydroxide. The most common sol-gel method for preparing aluminum hydroxide is to hydrolyze aluminum salts and alkoxides in water. The mechanism is divided into two steps: the -OR group is first hydrolyzed to produce -OH, and then aluminum hydroxide is precipitated in the form of precipitation.
A highly crystalline aluminum hydroxide product was synthesized by reacting aluminum isopropoxide and monobutyltrimethylimidazolium borofluoride in 1 L of hydrophilic ionic liquid and using (NH)4OH as a catalyst at 30 °C. , and heat treatment at 300 ℃ to obtain highly crystalline alumina particles, and the product is boehmite with low crystallinity when isopropanol is used as a medium, and a new composite material is synthesized by combining the aluminum hydroxide product with polystyrene.
The carbon fractionation method is a method in which CO2 gas is introduced into the sodium metaaluminate solution to precipitate aluminum hydroxide, and the size and morphology of the product are controlled by adjusting the pH value and CO2 concentration.
Microemulsions typically consist of surfactants, cosurfactants, solvents, and water (or aqueous solutions). Microemulsions have properties such as ultra-low interfacial tension and high solubilizing ability. The preparation of nanomaterials by microemulsion technology can precisely control the crystal growth process of nanomaterials, and the microemulsion spheres wrap the crystal particles, effectively preventing the agglomeration of nanoparticles.
- Acid-base method: Zhejiang University of Technology uses industrial solid waste alum pulp as raw material, mainly containing KAl(SO4)2 and SiO2, and a small amount of Fe2O3 in the rest. First, use H2SO4 for acid treatment to obtain Al2(SO4)3, and then add Excess NaOH is filtered to remove iron to obtain sodium metaaluminate, which is then neutralized with H2SO4 to precipitate aluminum hydroxide. According to the discussion of the preparation process, it is considered that the best synthesis conditions are: H2SO4 concentration 16 mol/L, NaOH concentration 5 mol/L L. This method realizes the efficient utilization of industrial solid waste, but the product yield is not high and contains many impurities, which still needs to be purified.
- Ion membrane electrolysis method: Alkaline ion membrane electrolysis MA1(ΟH)4 to obtain aluminum hydroxide, where M represents an alkali metal, and the electrolysis temperature is not less than 40 °C. This method can greatly improve the decomposition efficiency of sodium aluminate, and obtain high-quality, high-yield aluminum hydroxide.
- Homogeneous precipitation method: Using Al(NO) 3 9H2O and anhydrous sodium acetate as raw materials, nano-sodium hydroxide was prepared by homogeneous precipitation in the absence of water. The specific experiment is as follows: 0.3 mmol Al(NO) 3 9H2O and 0.9 mmol anhydrous sodium acetate, with PVP (60 g) as the dispersant, add 30 mL of ethylene glycol together into a beaker and stir at room temperature until it is completely dissolved. The reactants were transferred to a 50 mL autoclave containing Teflon and crystallized at 180 °C for 5 h. This method can achieve the effect of controlling the particle size and morphology of the product by controlling the reaction temperature and the concentration of the reactants.
- Aluminum salt hydrolysis method: add 100 g Na2SO4 to 412 g Al2(SO4)3 solution, and then add the mixed solution to the Na2CO3 solution with a mass fraction of 26% at a rate of 25 mL/min for hydrolysis. When the pH is between 7 and 8, the synthesized BET is 350-450 m2/g, and the pore volume is 0.58-0.9×10-6 m2/g of porous boehmite. When the pH is equal to 9, the synthesized boehmite BET drops to 189 m2/g, while the pore volume increased to 1.27×10-6 m2/g.
References
- Dialume – PubChem
- Luo Yuchang. Current Situation and Development Trend of Aluminum Hydroxide Flame Retardant [D]. , 1989.
- Wang Lingyun, Tong Dongshen, Zhu Junbing, et al. Preparation method and application of aluminum hydroxide [J]. Zhejiang Chemical Industry, 2014, 45(12): 24-29.
Aluminum Hydroxide Supplier and Manufacturer
As a aluminum hydroxide supplier and manufacturer with a strict standard product quality system certificate, Zhishang Chemical has long been providing the best aluminum hydroxide raw materials to customers all over the world.
Over the years, relying on professional team experience and customer-centric team concept to meet customer needs in a timely manner, our company enjoys a high reputation in the world. At present, our company has served more than 6,000 customers and has established long-term cooperative relations with customers from many countries.
If you have a demand for aluminum hydroxide and related products, please contact our service staff Zhishang Chemical – White directly, and we will provide you with high-quality products at the best price.
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Do you accept sample order?
We will make samples before mass production, and after the sample is approved, we’ll begin mass production. Doing 100% inspection during production, then doing random inspection before packing.
What’s your MOQ?
Our MOQ is 1kg. But usually we accept less quantities, such as 100g on the condition that the sample charge is 100% paid.
Is there a discount?
The different quantity has different discount.
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You can get free samples for some products, you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests, we will manufacture the products according to your requests.
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1. ≤50kg, Express delivery recommended, usually called DDU service;
2. ≤500kg, Air shipping recommended, usually called FOB, CFR, or CIF service;
3. >500kg, sea shipping recommended, usually called FOB, CFR, or CIF service;
4. For high-value products, please select air shipping and express delivery for safe.
Quality Control of Aluminum Hydroxide

