What Is Aluminum hydroxide
- Other names: aluminium trihydroxide
- Chemical Formula: Al(OH)3
- Appearance: White powder
- Cas No.: 21645-51-2
- HS Code: 2818300000
- Package: 25kg, 1000kg
- Introduction: Aluminum hydroxide, also known as aluminium trihydroxide, is an inorganic substance with the chemical formula Al(OH)3, which is the hydroxide of aluminum. Aluminum hydroxide chemical is an amphoteric hydroxide because it can react with both acid and strong alkali to produce salt and water. It is divided into industrial grade and pharmaceutical grade according to its use. As an important industrial raw material, aluminum hydroxide plays an important role in various industries. It can be used as a flame retardant, filler, high-temperature material, catalyst, pharmaceutical adjuvant, acid neutralizer and saccharifying agent to improve the performance and quality of products.
Technical Specifications of Aluminum Hydroxide for Sale in Our Company
| Items | Result |
|---|---|
| AL(OH)3 Content % | 99.71 |
| SiO2 % | 0.005 |
| Fe2O3 % | 0.008 |
| Na2O % | 0.18 |
| Whiteness % | 97.83 |
| Moisture | 0.15 |
| Specific gravity | 3.4 |
| PH value of water suspension | 8.2 |
| Oil absorption g/100g | 29 |
| Average particle size µm | 5.03 |
| Refractive index | 1.58 |
| Packing | 20kg/bag (Craft paper bag with inner polyethylene film bag) |
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What Are Main Applications of Aluminum Hydroxide Powder
Flame retardant. Aluminum hydroxide powder is an excellent flame retardant, which can effectively slow down the spread of flames and improve the fire resistance of materials. In industries such as plastics, rubber, textiles, and electronics, adding an appropriate amount of aluminum hydroxide powder can make the product have good flame retardant properties and improve safety.
Used as filler. Aluminum trihydroxide can be used as a filler and is widely used in various materials, such as rubber products, plastic products, textiles, etc. It has good filling performance and the effect of increasing material strength, which can improve the physical properties of the product and improve the quality of the product.
High-temperature materials.Because aluminum trihydroxide has excellent high-temperature resistance, it has important applications in the field of high-temperature materials. For example, when preparing ceramic materials, industrial grade aluminum hydroxide can be used as the main raw material of ceramic materials. After heating treatment, high-temperature stable alumina is formed to improve the high-temperature resistance of ceramic materials.
Used as a catalyst. Aluminum hydroxide also plays an important role in the field of catalysts. It can be used as a carrier of the catalyst to fix the active components on its surface and improve the stability and reaction efficiency of the catalyst. In the field of chemical industry, aluminum trihydroxide is often used to prepare various catalysts, such as catalytic cracking catalysts, hydrogenation catalysts, etc.
Pharmaceutical adjuvant.Pharmaceutical grade aluminum hydroxide, as a non-toxic and non-irritating substance, is often used as an adjuvant for drugs. It can be used as a stabilizer, thickener and adsorbent for drugs to improve the stability and adsorption of drugs and improve the taste and use experience of drugs.
Acid neutralizer. Aluminum hydroxide can neutralize acidic substances and play an acid neutralization role. In the field of environmental protection, it is often used to treat acidic wastewater and acidic waste gas. Neutralize acidic substances into neutral or weak alkaline, making them easier to handle and discharge.
Saccharifying agent.In the field of food processing, it can promote the decomposition and reaction of sugar, increase the sweetness and solubility of sugar, and improve the taste and texture of food.
Performance of Aluminum Hydroxide
Its appearance is white powder with strong water absorption, bonding and stability.
Aluminium trihydroxide powder has strong bonding and can be widely combined with other metal elements to form complex silicates. When combined with carbonic acid, it can produce concrete-like substances.
It has a high melting point and a high operating temperature.
Al(OH)3 is insoluble in water and all organic solvents, but is easily soluble in dilute sulfuric acid and is acidic.
It is not affected by air and has a certain corrosion resistance.
What Are the Two Properties of Aluminium Trihydroxide
Aluminum trihydroxide has two properties, which can react with both acid and alkali.
From the perspective of acidity, aluminum hydroxide Al(OH)3 can show acidity under certain conditions and can react with strong alkali. For example, it reacts with sodium hydroxide to produce sodium aluminate and water.
From the perspective of alkalinity, aluminum hydroxide can react with acid in a neutralization reaction. For example, it reacts with hydrochloric acid to produce aluminum chloride and water.
The reason why aluminum trihydroxide has two properties is that aluminum is in the transition position between metal and non-metal in the periodic table. And its atomic structure enables aluminum hydroxide to show different properties under different environments. This two properties have important applications in industry and chemical experiments, such as in the preparation of aluminum salts and aluminates.
Industrial Preparation Methods of Aluminum Hydroxide Powder
The main methods for industrial preparation of aluminum hydroxide powder include the Bayer process and the sintering process, of which the Bayer process is the global mainstream process. In addition, the carbon separation method is also used in industrial production. These methods all use bauxite as raw material and achieve the separation and precipitation of aluminum elements through chemical conversion.
- Bayer Process
Applicable objects: large-scale production of industrial-grade aluminum hydroxide. The main raw material is bauxite.
Process steps:
Dissolution: Bauxite (the main component is Al2O3) reacts with concentrated sodium hydroxide (NaOH) at high temperature (150-250℃) and high pressure to generate sodium aluminate solution (NaAl(OH)4).
Sedimentation separation: remove insoluble impurities.
Decomposition: the sodium aluminate solution is cooled, diluted and seeded to precipitate aluminum hydroxide.
Features:
Low cost and high output, accounting for more than 90% of the global aluminum hydroxide output.
The product has high purity (≥99%), but contains trace sodium impurities (Na2O <0.3%).
Mainly used as a precursor for metallurgical-grade alumina or industrial-grade aluminum hydroxide production.
- Sintering method
Applicable objects: treatment of low-grade bauxite or Bayer red mud recovery.
Process steps:
Sintering: Bauxite is mixed with sodium carbonate (Na2CO3) and limestone (CaCO3) and sintered at 1200℃ to produce sodium aluminate (NaAlO2).
Dissolution: The sintered product is leached with water to obtain a sodium aluminate solution.
Carbon fraction: CO2 is introduced into the solution to precipitate aluminum hydroxide.
Features:
It can process high-silicon bauxite, but the energy consumption is high and the process is complicated.
The product has a high sodium content and requires subsequent washing treatment.
- Acid-base neutralization method
Applicable objects: high-purity aluminum hydroxide (pharmaceutical, electronic grade)
Process steps:
Dissolution of aluminum salt: aluminum sulfate (Al2(SO4)3) or aluminum chloride (AlCl3) is dissolved in water.
Neutralization precipitation: Add ammonia (NH4OH) or ammonium bicarbonate (NH4HCO3) to neutralize and generate aluminum hydroxide gel.
Aging and washing: Control pH and temperature to convert the gel into crystals, and wash to remove impurity ions (SO4²⁻, Cl⁻, etc.).
Features:
The product purity is extremely high (more than 99.9%), but the cost is relatively high.
The particle size and morphology can be precisely controlled (such as nano-scale aluminum hydroxide).
What Aspects Should be Considered When Purchasing Aluminum Trihydroxide Powder
Purity level. Industrial grade (usually 95-99%), pharmaceutical grade (99.5% or more) or electronic grade (99.99% or more)
Particle size distribution. D50 value, D90 value and other indicators, different applications have different requirements for particle size
Whiteness index. Especially used in fields with high appearance requirements such as plastics and rubber
Moisture content. Generally required to be ≤0.5% or adjusted according to specific applications.
Impurity content. Special attention should be paid to the limits of specific impurities such as Fe, Na, and Si.
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