Process system and method for cooperatively disposing arsenic alkali residues in recycling manner by cement kiln

Abstract

The invention discloses a process system and method for cooperatively disposing arsenic alkali residues in a recycling manner by a cement kiln. The system comprises an arsenic alkali residue crushingsystem, a low-melting-point heavy metal waste residue combined smelting furnace incineration system, a cement kiln cooperative enhanced flue gas arsenic and antimony removal system, a cement early strength agent preparation system and an alkali removal system. The method comprises the following steps: after crushing the arsenic alkali residues, adding a silica raw material and coal in the arsenicalkali residues, and carrying out high-temperature calcination; sublimating arsenic and antimony in the arsenic alkali residues at different high temperatures and separating the arsenic and the antimony from entering flue gas by the low-melting-point heavy metal waste residue combined smelting furnace incineration system; after treating generated high-temperature flue gas, delivering the high-temperature flue gas into a cement kiln system to be incinerated and solidified again; separately taking collected arsenic-containing dust and antimony-containing dust as raw materials for smelting the arsenic and the antimony; and preparing a cement early strength agent or a high-concentration soda ash solution by using a remaining lumpy material. According to the invention, the arsenic alkali residues are incinerated at a high temperature, so that the toxic hazard of the arsenic alkali residues is eliminated, and the requirements of developing circular economy and sustainable development are met.

Description

technical field [0001] The invention belongs to a treatment system and method for arsenic-alkali slag detoxification, in particular to a process system and method for co-processing arsenic-alkali slag by utilizing cement kiln resources. 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 refine crude antimony to produce various type...

AI Technical Summary

Problems solved by technology

Arsenic-alkali slag is likely to cause secondary pollution by oxidative roasting and volatilization, and the treatment effect is poor

In wet treatment, leaching is usually used, metal antimony, sodium antimonate, etc. remain in the arsenic-antimony slag, and soluble sodium salts such as sodium carbonate, sodium arsenate, sodium sulfate, and sodium thiosulfate enter the leachate, and then evaporate. Crystallization to obtain arsenic-alkali mixed salt, but the mixed salt is unstable and has little application value

The existing arsenic-alkali residue disposal technology has the problem of residual arsenic in the residue, whether it is wet or cremated, especially the arsenic content in the residue after wet washing exceeds 0.5%, and its property is still hazardous waste. In addition, the content of antimony in the current arsenic-alkali slag is low, and it has no economic value to adopt the method of returning to the furnace for smelting, and it will only increase the amount of waste slag

At the same time, there are still problems such as long processing process, high energy consumption, and inability to operate safely for a long time.

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