Method for preparing calcium sulfite by utilizing sulfur dioxide waste gas

Abstract

The invention relates to the technical field of comprehensive utilization of inorganic chemical lithopone manufacture waste lead skim, in particular to a method for preparing calcium sulfite by utilizing sulfur dioxide waste gas. In the invention, calcium oxide is mainly utilized to treat released sulfur dioxide gas while lithopone waste residue heavy metals are extracted by utilizing an electric arc furnace technique, and the gas is applied to prepare a calcium sulfite product. The invention not only eliminates the toxic sulfur dioxide gas but also prepares the valuable product, reduces the pollution of the waste gas to the environment and meanwhile prepares the valuable product, thereby having obvious social benefits and economic benefits; and especially, the process and the production equipment are simple, thereby the method is a comparatively practical treatment and utilization method.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of waste lead slag produced by lithopone in inorganic chemical industry, in particular to a method for preparing calcium sulfite from sulfur dioxide waste gas treated with lithopone waste residue. technical background [0002] Lithopone is a common name for white high-grade pigment lithopone, and its main raw materials are zinc dioxide, sulfuric acid, barite and anthracite. It is prepared by metathesis reaction of barium sulfide and zinc sulfide. In the process of lithopone production, a variety of heavy metal waste residues are produced, such as lead slag, zinc slag, cadmium slag, barium slag, coal slag and other solid wastes. The annual accumulation of about thousands of tons not only pollutes farmland and the environment, but also endangers crops. Growth, but also caused the waste of several metal elements such as lead, pickaxe, copper, zinc and germanium, gallium, indium, an...

AI Technical Summary

Problems solved by technology

In the process of lithopone production, a variety of heavy metal waste residues are produced, such as lead slag, zinc slag, cadmium slag, barium slag, coal slag and other solid wastes. The annual accumulation of about thousands of tons not only pollutes farmland and the environment, but also endangers crops. growth, but also caused the waste of several metal elements such as lead, pickaxe, copper, zinc, germanium, gallium, indium, and chromium in the waste slag

At present, most of this waste residue is piled up in the open air or filled in the gaps or paved, which not only wastes resources, but also pollutes the environment.

For this reason people have carried out a large amount of researches, in 1973 " fine chemical intermediates " in the 01 issue, researched on the production of various products with lithopone waste residue, "Hunan Chemical Industry " also reported in the 1992 volume 22 the first issue "Research on Producing Lead Sulfate from Lithopone Acid Leaching Waste Residue", but the article is only in theoretical research, there is no more practical treatment and utilization method, and the use of electric arc furnace to treat the waste residue produced by Lithopone is a A relatively simple and effective method, but currently there is no good treatment method for the waste gas generated in the process of processing waste residue

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