How Is Polyaluminum Chloride Made?

Aluminum, chlorine, hydrogen, and oxygen combine to form the acidic solution known as polyaluminium chloride. It is also known as PAC, PAX, or Polyaluminum Hydroxide Chloride Sulphate Solution. It is clear to slightly yellow in color. The production of paper and textiles, chemicals, antiperspirant and deodorant, and water and wastewater treatment, including industrial wastewater treatment, is the main domestic use of Polyaluminum Chloride.

Metal Aluminum Method:

Raw Materials

A roasting furnace, a stirring tank, a filter, a concentration kettle, water, calcium aluminate powder, and industrial-grade hydrochloric acid are used as equipment. The final product is prepared by roasting concentration kaolin, roasting kaolin, and hydrochloric acid, performing a reaction on calcium aluminate powder, filtering, concentrating, performing poly aluminum chloride spray forming, and drying.

Production Process

The innovation is in the field of chemical engineering, and it describes a procedure for making polyaluminum chloride. The product is widely applicable to fields of drinking water, industrial water, sewage processing, and papermaking, and it has the advantages of strong water processing capability, small usage amount, low corrosivity, good operation conditions, and the like. The method has the characteristics of simple production technology, low production cost, and high product purity.

Aluminum Hydroxide Method:

Raw Materials

There are two steps in the standard PAC preparation process used in industry. Initially, a strong hydrochloric acid (HCl) solution is used to dissolve the aluminum-containing raw material (such as bauxite, gibbsite, granular aluminum, etc.) at high temperatures, high pressures, and extended reaction times. The basicity value is then adjusted by adding alkaline materials, such as calcium carbonate, sodium hydroxide (NaOH), aluminum acid, etc.

Production Process

The following steps make up the production process: first, industrially synthesized hydrochloric acid is added to a reaction container while stirring continuously. Next, aluminum hydroxide is added, with a molar ratio of 1 between the two substances. Heating with steam, reacting for two to three hours with a controlled reaction temperature of 80–110 DEG C, and obtaining a reaction liquid. After cooling the reaction liquid to 50–70 DEG C, calcium aluminate powder and water are added while stirring continuously.

Next, regulating the flow while adding water to maintain the solution’s temperature between 80 and 100 degrees Celsius, subtracting the total amount of water from the amount of water converted from the steam, reacting for two to three hours, separating the liquid from the slag, sub-packaging the liquid final product, and storing it.

Alumina Method

Raw Materials

Hydrated alumina (Al(OH)3), hydrochloric acid (HCl), sulfuric acid (H2SO4), and calcium carbonate (CaCO3) are the raw materials used in the production of liquid PAC.

Production Process

The following steps make up the preparation procedure for Polyaluminum Chloride: Crushing and burning bauxite for 0.5–2 hours at a temperature of 1200–1500 DEG C; two methods of preparing polyaluminum chloride are as follows: adding calcium carbonate powder to a reaction kettle, reacting for 15–24 hours, and heating the mixture to 95–110 degrees Celsius. Adding bauxite powder and calcium aluminate powder to the reaction kettle.

Adding 25–30% of hydrochloric acid solution to the reaction kettle. Deposing and drying moisture polyaluminum chloride to obtain the polyaluminum chloride. The invention states that low-cost bauxite is used as a raw material to create polyaluminum chloride, which has a high degree of polymerization and an excellent adsorption effect.

Alkali Solution Method

Raw Materials

Two major classes of raw materials are used to produce polymerized aluminum chloride: one class is made up of minerals that contain aluminum, such as bauxite (boehmite, gibbsite, diaspore), clay, kaolin, alunite, etc. Coal gangue, fly ash, metallic aluminum, aluminum scrap pieces, grey aluminum, aluminum hydroxide, and aluminum chloride are some examples of other raw materials that contain aluminum.

Alkali Solution Method

Raw Materials

Two major classes of raw materials are used to produce polymerized aluminum chloride: one class is made up of minerals that contain aluminum, such as bauxite (boehmite, gibbsite, diaspore), clay, kaolin, alunite, etc. Coal gangue, fly ash, metallic aluminum, aluminum scrap pieces, grey aluminum, aluminum hydroxide, and aluminum chloride are some examples of other raw materials that contain aluminum.

Production Process

Poly aluminium chloride manufacturing process includes Mixing and reacting sodium hydroxide and aluminum ash to yield the sodium aluminate solution. After that, add hydroelectric acid to the aluminum chloride solution to alter the pH value. This method’s benefits include a low insoluble content and a pleasingly colored final product.

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