Cryolite is a mineral mainly used in the electrolytic aluminum industry. It can be used in the aluminum smelting industry as a co-solvent for electrolytic aluminum; it can be used in resin grinding wheels to improve the wear resistance of the grinding wheel and prolong the service life of the grinding wheel; it can be added to glass as an anti-reflection coating; it can also be used as a pesticide pesticides to use. Cryolite is the most widely used in the chemical industry, but because of its very small output in nature, it cannot meet the needs of industry. In response to this situation, a new cryolite regeneration method has been explored in the industry, that is Electrolytic aluminum carbon slag treatment regeneration cryolite method. As a cryolite grinding mill manufacturer, Guilin Hongcheng will introduce to you today the process principle of the production line for electrolytic aluminum carbon slag treatment of recycled cryolite powder.
Cryolite is sodium hexafluoroaluminate and sodium aluminum fluoride. White monoclinic (1009°C) slightly soluble in water. Molten cryolite can dissolve alumina. Using electrolytic aluminum carbon slag to process recycled cryolite powder production line raw materials come from the waste slag produced in the process of aluminum electrolysis, the production cost is low, and the hydrogen fluoride gas generated in the process of waste slag treatment can be repeatedly recycled to produce cryolite products after being absorbed by water or alkali . The produced cryolite products are mainly used as flux for aluminum electrolysis, so the cryolite produced by this method is called recycled cryolite. This method uses the waste in the electrolytic cell of the electrolytic aluminum plant as the source of aluminum in the product, turning waste into treasure, comprehensively utilizing resources, protecting the environment, benefiting one party, and benefiting the country and the people. This technology has greatly reduced the production cost of cryolite and greatly enhanced the competitiveness of the product in the market. The process of electrolytic aluminum carbon slag processing recycled cryolite powder production line has greatly reduced environmental pollution and contributed to the development of clean production of cryolite. It is very important for environmental protection and sustainable development.
The process principle of the electrolytic aluminum carbon slag treatment recycled cryolite powder production line is: grind the aluminum electrolytic waste slag through a cryolite grinding mill to below 75-250 microns, remove carbon and iron in the waste slag, and then add concentrated sulfuric acid. After 30-1800 minutes of reaction at a temperature of 20-90°C, the hydrogen fluoride gas generated during the reaction is absorbed with water or lye. After the reaction is completed, add water 1-20 times the mass of waste residue, stir for 2-20 minutes, filter, and add 10-30% mass fraction of sodium carbonate solution or solid sodium carbonate, 10-50% mass fraction of hydrofluoric acid to the filtrate acid. Stirring and reacting at 20-95 degrees for 1-3 hours to obtain cryolite slurry. After filtering, washing and drying, the cryolite product is obtained. Then it is processed by a cryolite mill to obtain finished cryolite powder.
The production steps of the production line of electrolytic aluminum carbon slag processing recycled cryolite powder are as follows:
The electrolytic slag is sent to the jaw crusher to be broken into small pieces.
The crushed small pieces are sent to the cryolite mill to be ground into powder.
The powdered electrolytic slag is sent into the mixer and stirred evenly.
The evenly stirred electrolytic slag is sent to the flotation machine through three steps of rough selection, primary selection and secondary selection.
5. Liquid-solid separation
The flotation material is pumped into the ceramic filter for liquid-solid separation, which is the "prototype" of artificial cryolite.
The separated solid material (cryolite) is sent to the three-pass dryer for further drying treatment, and the artificial cryolite is obtained. The cryolite product is pulverized again by a cryolite mill to obtain the finished product of cryolite powder as a cosolvent in the aluminum factory.
Guilin Hongcheng is a manufacturer of cryolite mills. Our HC series Raymond mills have been widely used in cryolite production lines. We have rich customer cases for the treatment of electrolytic aluminum carbon slag and the grinding of cryolite products. It can process 80-400 mesh powder, the fineness can be adjusted, the output can be selected within 1-50t/h, the model is complete, and the category is rich. If you have purchase needs of cryolite mill, welcome to leave us a message for equipment details.