Aluminum chlorohydrate

Product Details

CasNo： 1327-41-9

MF： (Al₂(OH)ₙCl₆₋ₙ)ₘ

Appearance： Solid

Delivery Time： 15 days

Packing： 25kg/bag

Purity： 90%

• Basic Information
  • English Name: Poly Aluminium Chloride
  • Chemical Formula: (Al₂(OH)ₙCl₆₋ₙ)ₘ (m≤10, n = 1 - 5)
  • CAS No.: 1327 - 41 - 9
  • Appearance: Usually exists in the form of yellow or tan powder, granules, or liquid. There are also white and dark - brown products, showing a resin - like solid state.
• Physical and Chemical Properties
  • Density: Related to the alumina content, basicity of the product, and temperature. For example, when the alumina content is 10% - 15% and the basicity is 60% at 20℃, the density ranges from 1.175 to 1.228g/cm³.
  • Solubility: Easily soluble in water. During the dissolution process, hydrolysis occurs, accompanied by physical and chemical processes such as electrochemical action, coagulation, adsorption, and precipitation.
  • Stability: The solid powder is relatively stable, but it is easy to be affected with damp in a humid environment. When heated above 110℃, it will decompose, releasing hydrogen chloride and finally decomposing into aluminum oxide. It will undergo depolymerization reaction with acids, increase the degree of polymerization and basicity with alkalis, and is prone to generate precipitation when mixed with aluminum sulfate or other polyvalent acids.
  • Odor: It has a sour and astringent taste.
• Preparation Methods
  • Acid Method: Using aluminum - containing minerals such as bauxite and calcium aluminate as raw materials, they are dissolved in acid under normal pressure in two - step. The bauxite is first crushed and ground, roasted in a boiling furnace at 650 - 800℃, and then the cooked ore powder is added to hydrochloric acid for acid - dissolving reaction to dissolve the aluminum liquid. After that, calcium aluminate or sodium aluminate is added to adjust the basicity for ripening to obtain liquid PAC, which is further dried by drum drying or spray drying to get solid products. This is the most widely used process in China.
  • Aluminum Hydroxide Method: This is a one - step acid - dissolving process. Aluminum hydroxide and hydrochloric acid are put into an enamel reaction kettle, and dissolved under heating and pressure to obtain an acidic aluminum liquid. Then, calcium aluminate powder is added at 80 - 90℃ to adjust the pH to 3.2 - 3.5, and after continuous reaction for 3 - 4 hours, it is filtered to obtain a liquid product, which can be made into a solid product through spray drying or drum drying. This process is simple and the product quality is good, and it is mainly used for producing PAC for domestic drinking water in China.
• Quality Indicators
  • Alumina Content: An important indicator, generally required to be ≥29%. A higher alumina content usually indicates better product quality.
  • Basicity: It refers to the ratio of hydroxyl groups to aluminum, which is a key indicator and has a great influence on the coagulation effect. Usually, it is between 40% and 60%.
  • Insoluble Substances: Excessive insoluble substances will block the dosing pipeline and affect the coagulation effect, generally required to be ≤0.3%.
• Product Uses
  • Water Treatment Field: Widely used in the purification treatment of river water, reservoir water, industrial circulating water, and sewage. It can quickly flocculate and precipitate suspended particles in water, reduce water turbidity, and remove micro - toxic substances and heavy metal ions. It is applicable to the treatment of various industrial wastewaters, such as printing and dyeing wastewater, metallurgical wastewater, coal washing wastewater, etc., as well as the treatment of urban domestic sewage and the raw water treatment of waterworks.
  • Other Industries: It can be used as a sizing precipitant in the paper - making industry to improve the physical properties of paper; as a coagulant aid in the pharmaceutical industry; and also in the production processes of cosmetics, catalysts, and refractory materials.
• Packaging and Storage
  • Packaging: Export products are usually packed in PE bags with a double - layer inner film, weighing 20kg. Domestic products are mostly packed in 25kg polyvinyl chloride woven bags with a double - layer inner film.
  • Storage: It should be stored in a ventilated and dry place, and should not be mixed with other chemicals. The storage period of solid products is generally one year.