Polyaluminum chloride is one of the first choices for most water treatment chemicals in my country. It has a very large range of adaptations and is suitable for the regulation and treatment of various sewage, waste water, domestic sewage and drinking water.
There are two main raw materials for the production of polyaluminum chloride; one is aluminum-containing minerals, including bauxite, clay, kaolin, alumite, etc.; the other is other aluminum-containing raw materials, including metal aluminum, waste aluminum Chips, gray aluminum, aluminum hydroxide, coal rate, coal gangue, aluminum hydroxide, etc. Only using aluminum ingots, aluminum scraps, aluminum hydroxide as raw materials, aluminum sulfate and chlorine dioxide as raw materials can produce relatively pure polyaluminum chloride products. The raw materials for the production of polyaluminum chloride are mainly polyaluminum chloride products from clay ore, kaolin ore and bauxite production sites. Except for iron, other indicators can reach the advanced level abroad. However, due to the large amount of slag, the appearance is crossed. After switching to the raw material aluminum hydroxide. In addition, some production uses raw materials such as alumina and metal aluminum. Domestic synthetic polyaluminum chloride hydrochloric acid contains high iron content, and the appearance of polyaluminum chloride at the production site is yellowish in appearance.
There are many manufacturing methods of polyaluminum chloride. According to the production process, it can be divided into acid method, subtraction method, neutralization method, pyrolysis method, pressure reaction method, mixed gel method, electroosmosis method, electrolysis method, etc. The manufacture of solid aggregate aluminum chloride is obtained by drying the liquid polyaluminum chloride by drum drying or spray drying. Spray drying is generally produced with high content of polyaluminum, red yellow and millet yellow, which is suitable for large-scale production. Smaller production enterprises use drum drying. At present, the methods of producing polyaluminum halide in my country mainly include metal aluminum method, active aluminum hydroxide method, aluminum oxide method, crystalline alumina method, etc.