CHEMISTS OF PERM POLYTECH GOT DOMESTIC RAW MATERIALS FOR PRODUCING AN ALUMINUM USING ECO-FROENDLY AND INEXPENSIVE WAY

1 September 2022 127

Aluminum fluoride is most commonly used in the production of aluminum, but it is also used in production of enamels, glasses, glazes, ceramics, and tool coatings. In Russia, only 50-60% of need in the substance is now satisfied. Aluminum fluoride is obtained in three ways, which are based on "wet" schemes. They use imported fluorspar. Demand for it is growing every year, and stocks of raw materials are declining. In addition, these technologies have disadvantages. In particular, this is an insufficiently high yield of the finished product and a large amount of polluted water that needs to be cleaned.

Scientists of the Perm Polytech have proposed a "dry" method for the production of aluminum fluoride from production of phosphoric acid waste. This will make it possible to replace expensive raw materials with its alternative source, to improve the quality of the product and to ensure the environmental compatibility of its production.

First, the fluorosilicic acid was neutralized with gases containing ammonia, and then the silicon oxide was separated from the ammonium fluoride solution. Next, the solution was evaporated and mixed with aluminum hydroxide, treated in a fluidized bed furnace at a temperature of 400-450 ° C and aluminum fluoride was obtained. The heat treatment gases, after cooling and water extraction, were sent to neutralize the acid, the researcher explains.

Chemists have determined the most optimal conditions and modes of technology, which made it possible to provide the desired result.

Unlike analogues, the method proposed by the scientists of the Perm Polytech allows to get more product from inexpensive raw materials. When using the new technology, aggressive wet gases and polluted wastewater are not formed. A small number of stages is needed to get raw materials in a continuous and intensive mode. The technology will be promising for implementation at enterprises of the chemical and metallurgical industries that produce aluminum and fluoride salts. In addition, the development of chemists will allow companies to recycle waste.

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