Collaborative treatment system and method for treating arsenic alkali residue grinding leaching dealkalization and cement kiln recycling

Abstract

The invention discloses a collaborative treatment system and method for treating arsenic alkali residue grinding leaching dealkalization and cement kiln recycling, arsenic alkali residue is sequentially subjected to crushing, grinding leaching dealkalization, alkali liquor purification and alkali liquor evaporation treatment, washing is carried out for multiple times during the grinding leaching dealkalization, the alkali content of the residue after dealkalization is greatly reduced, and sodium arsenate and sodium antimonate in the solution are converted into precipitate substances which areinsoluble in water under the action of a precipitant, so that high-temperature calcination is facilitated, arsenic and antimony in the arsenic alkali residue are removed, the alkali liquor generated in the treatment process can be evaporated and concentrated to be used as a smelting medicament or a desulfurizing agent and the like, the obtained solid can be calcined at high temperature, the calcined residue is used as a cement raw material, the production cost is saved, and the requirements of development cycle economy and sustainable development are met.

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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