A system and method for synergistic treatment of arsenic-alkali slag grinding leaching dealkalization and cement kiln resource utilization

Abstract

The invention discloses an arsenic-alkali slag grinding leaching dealkalization and cement kiln resource utilization cooperative treatment system and process. The arsenic-alkali slag is sequentially processed through crushing, grinding leaching dealkalization, lye purification and lye evaporation. The alkali process is washed many times, and the alkali content in the residue after dealkalization is greatly reduced. The sodium arsenate and sodium antimonate in the solution are converted into water-insoluble precipitation substances under the action of the precipitant, which is beneficial to high-temperature calcination and removal of arsenic. The arsenic and antimony in the alkali slag, the lye produced during the treatment process can be evaporated and concentrated, used as a smelting agent or desulfurizer, etc., the solid obtained after filtration can be calcined at high temperature, and the calcined residue can be used as cement raw materials. It saves production costs and meets the requirements of developing circular economy and sustainable development.

Description

technical field [0001] The invention belongs to a treatment system and method for dealkalization of arsenic-alkali slag, in particular to a system and method for synergistic treatment of arsenic-alkali slag grinding leaching dealkalization and cement kiln resource utilization. Background technique [0002] Antimony is one of the top ten non-ferrous metals. There are as many as 120 known antimony-containing minerals, but only 10 have industrial value. With the development of science and technology, antimony has been widely used in the production of various flame retardants , alloys, ceramics, glass, pigments, semiconductor components, medicine and chemical industries. [0003] Arsenic-alkali slag is a kind of highly toxic smelting waste containing sodium arsenate, sodium antimonate and sodium carbonate produced during the antimony refining process when removing arsenic. It is produced by adding soda ash ( Sodium carbonate) and caustic soda (sodium hydroxide) are used to refi...

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Problems solved by technology

[0008] In order to overcome the problem of high alkali content in the arsenic-alkali slag, which will affect the safe operation of the equipment due to the high alkali content in the arsenic-alkali slag, and at the same time, there are also problems such as high requirements for equipment materials and difficult selection. Sodium and sodium carbonate solutions are easily soluble in water. The by-product of caustic soda solution is obtained by crushing the arsenic-alkali slag, grinding, leaching, lye purification and concentration. The alkali content of the residue after dealkalization is greatly reduced. Sodium arsenate and antimony in the solution Adding additives such as calcium oxide or iron salts to sodium phosphate into water-insoluble calcium salts or iron salts into solid residues, which is beneficial to high-temperature calcination, removes arsenic and antimony in arsenic-alkali slag, and the residue after high-temperature calcination is used as cement raw material use

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