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Method for preparing sodium bisulfite from sulfur dioxide waste gas

A technology for sodium bisulfite and sulfur dioxide is applied in the field of preparing sodium bisulfite from sulfur dioxide waste gas, which can solve problems such as harming the growth of crops, pollute the environment, waste resources, etc., and achieve significant social and economic benefits. The process and production equipment are simple, The effect of eliminating sulfur dioxide gas

Inactive Publication Date: 2011-04-13
汪晋强
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  • 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

Method used

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  • Method for preparing sodium bisulfite from sulfur dioxide waste gas
  • Method for preparing sodium bisulfite from sulfur dioxide waste gas

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Example Embodiment

[0020] Example 1

[0021] A method for preparing sodium bisulfite from sulfur dioxide waste gas, including the following preparation steps:

[0022] Step A: Transfer the waste slag generated from the preparation of lithopone powder to the electric arc furnace 1 for calcination, and the remaining solid after the calcination is discharged for use;

[0023] Step B. Into the reactor 1 containing the sodium hydroxide solution, sulfur dioxide gas is introduced at a pure mass ratio of sulfur dioxide to sodium hydroxide of 1:0.6, and the agitator in the reactor 1 is slowly started to perform a chemical reaction; The mass concentration of sodium hydroxide solution is 10%; the calculation is calculated as pure 800kg sodium hydroxide solution; that is, the sodium hydroxide that actually reacts with sulfur dioxide gas is 80kg;

[0024] Step C, filtering the reaction product obtained in step B with a suction filter 2, and the obtained filter cake impurities are incinerated and buried deeply;

[002...

Example Embodiment

[0027] Example 2

[0028] A method for preparing sodium bisulfite from sulfur dioxide waste gas, including the following preparation steps:

[0029] Step A: Transfer the waste slag generated from the preparation of lithopone powder to the electric arc furnace 1 for calcination, and the remaining solid after the calcination is discharged for use;

[0030] Step B. Into the reactor 1 containing the sodium hydroxide solution, sulfur dioxide gas is introduced at a pure mass ratio of sulfur dioxide to sodium hydroxide of 1:0.8, and the agitator in the reactor 1 is slowly started to perform a chemical reaction; The mass concentration of sodium hydroxide solution is 20%; the calculation is calculated as pure 800kg sodium hydroxide solution; that is, the sodium hydroxide that actually reacts with sulfur dioxide gas is 160kg;

[0031] Step C, filtering the reaction product obtained in step B with a suction filter 2, and the obtained filter cake impurities are incinerated and buried deeply;

[00...

Example Embodiment

[0034] Example 3

[0035] A method for preparing sodium bisulfite from sulfur dioxide waste gas, including the following preparation steps:

[0036] Step A: Transfer the waste slag generated from the preparation of lithopone powder to the electric arc furnace 1 for calcination, and the remaining solid after the calcination is discharged for use;

[0037] Step B. Into the reactor 1 containing the sodium hydroxide solution, sulfur dioxide gas is introduced at a pure mass ratio of sulfur dioxide to sodium hydroxide of 1:1.00, and the agitator in the reactor 1 is slowly started to perform a chemical reaction; The mass concentration of the sodium hydroxide solution is 30%; the calculation is based on the pure 800kg sodium hydroxide solution; that is, the sodium hydroxide that actually reacts with the sulfur dioxide gas is 240kg;

[0038] Step C, filtering the reaction product obtained in step B with a suction filter 2, and the obtained filter cake impurities are incinerated and buried deep...

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Abstract

The invention relates to the technical field of comprehensive utilization of waste lead skim produced in the preparation of inorganic chemical lithopone, in particular to a method for preparing sodium bisulfite from a sulfur dioxide waste gas during the treatment of lithopone waste residues. The method is mainly used for preparing sodium bisulfate products from a sulfur dioxide gas, wherein the sulfur dioxide gas is generated when heavy metals are extracted from the lithopone waste residues by arc furnace technology and is treated by solution of sodium hydroxide. In the method, the toxic sulfur dioxide gas is eliminated effectively; valuable products are prepared; environmental pollutions caused by the waste gas are reduced; remarkable social and economical benefits are achieved; particularly, the process and the production equipment are simple; and the method is a 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 sodium bisulfite from sulfur dioxide waste gas treated with lithopone waste slag. 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, and ...

Claims

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Application Information

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IPC IPC(8): C01D5/14
Inventor 王嘉兴
Owner 汪晋强
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