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Method for preparing barium sulfite by using sulfur dioxide waste gas

A technology of sulfur dioxide and barium sulfite, applied in chemical instruments and methods, calcium/strontium/barium sulfite, separation methods, etc., can solve problems such as endangering crop growth, polluting the environment, wasting resources, etc., and achieves significant social benefits and Economic benefits, simple process and production equipment, and the effect of eliminating sulfur dioxide gas

Inactive Publication Date: 2011-02-02
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method for preparing barium sulfite by using sulfur dioxide waste gas
  • Method for preparing barium sulfite by using sulfur dioxide waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing barium sulfite from sulfur dioxide waste gas, including the following preparation steps:

[0021] Step A: Transfer the waste slag produced by the preparation of lithopone to the electric arc furnace 1 for calcination, and the remaining solids after the calcination are discharged for use;

[0022] Step B: Into the reactor 2 containing the barium oxide solution, sulfur dioxide gas is introduced at a pure mass ratio of sulfur dioxide to barium oxide of 1:0.25, and the stirrer in the reactor 2 is slowly started to perform a chemical reaction; wherein the barium oxide The mass concentration of the solution is 20%; the calculation is based on a pure 600kg barium oxide solution; that is, the actual barium oxide that reacts with sulfur dioxide gas is 120kg;

[0023] Step C, filtering the reaction product obtained in step B with a suction filter 3;

[0024] Step D: Pass the filter cake obtained by filtering in step C through the scrubber 4, the dryer 5 and the pul...

Embodiment 2

[0026] A method for preparing barium sulfite from sulfur dioxide waste gas, including the following preparation steps:

[0027] Step A: Transfer the waste slag produced by the preparation of lithopone to the electric arc furnace 1 for calcination, and the remaining solids after the calcination are discharged for use;

[0028] Step B. Into the reactor 2 containing the barium oxide solution, sulfur dioxide gas is introduced at a pure mass ratio of sulfur dioxide to barium oxide of 1:0.25, and the stirrer in the reactor 3 is slowly started to perform a chemical reaction; wherein the barium oxide The mass concentration of the solution is 30%; the calculation is based on a pure 600kg barium oxide solution; that is, the actual barium oxide reacting with sulfur dioxide gas is 180kg;

[0029] Step C, filtering the reaction product obtained in step B with a suction filter 3;

[0030] Step D: Pass the filter cake obtained by the filtration in step C through the scrubber 4, the dryer 5 and the p...

Embodiment 3

[0032] A method for preparing barium sulfite from sulfur dioxide waste gas, including the following preparation steps:

[0033] Step A: Transfer the waste slag produced by the preparation of lithopone to the electric arc furnace 1 for calcination, and the remaining solids after the calcination are discharged for use;

[0034] Step B. Into the reactor 2 containing the barium oxide solution, pass sulfur dioxide gas at a pure mass ratio of sulfur dioxide to barium oxide of 1:0.65, and slowly start the stirrer in the reactor 2 to make a chemical reaction; wherein the barium oxide The mass concentration of the solution is 50%; the calculation is calculated based on the pure 600kg barium oxide solution; that is, the actual barium oxide reacting with the sulfur dioxide gas is 300kg;

[0035] Step C, filtering the reaction product obtained in step B with a suction filter 3;

[0036] Step D: Pass the filter cake obtained by filtration in step C through a scrubber 4, a dryer 5 and a pulverizer ...

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Abstract

The invention relates to the technical field of comprehensive utilization of waste lead slag manufactured by inorganic chemical lithopone, in particular to a method for preparing barium sulfite by using sulfur dioxide waste gas treated by lithopone waste slag. The sulfur dioxide gas discharged at the same time of extracting heavy metals of the lithopone waste slag by treating barium oxide through an arc furnace is mainly used in the method, and the gas is used for preparing a barium sulfite product. Therefore, the method not only effectively eliminates the toxic sulfur dioxide gas, but also prepares the valuable product; the method prepares the valuable product at the same time of relieving the pollution of the waste gas to the environment, and has remarkable social benefit and economic benefit; and in particular, the method has simple process and production equipment, and is a more 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 inorganic chemical lithopone powder, in particular to a method for preparing barium sulfite from sulfur dioxide waste gas treated with lithopone powder waste residue. technical background [0002] Lithopone is the common name for white high-grade pigment lithopone. Its main production materials are zinc dioxide, sulfuric acid, barite and anthracite. It is produced by the metathesis reaction of barium sulfide and zinc sulfide. During the production of lithopone, a variety of heavy metal residues are produced, such as lead slag, zinc slag, cadmium slag, barium slag, coal slag, and other solid wastes, which accumulate about thousands of tons each year, which not only pollutes farmland and environment, but also harms crops Growth, but also caused the waste of lead, pickaxe, copper, zinc and several metal elements such as germanium, gallium, indium, and insc...

Claims

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Application Information

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IPC IPC(8): C01F11/48B01D53/78B01D53/50
Inventor 王嘉兴
Owner 汪晋强
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