CN101972597A - Method for preparing calcium sulfite by utilizing sulfur dioxide waste gas - Google Patents
Method for preparing calcium sulfite by utilizing sulfur dioxide waste gas Download PDFInfo
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- CN101972597A CN101972597A CN2010105192033A CN201010519203A CN101972597A CN 101972597 A CN101972597 A CN 101972597A CN 2010105192033 A CN2010105192033 A CN 2010105192033A CN 201010519203 A CN201010519203 A CN 201010519203A CN 101972597 A CN101972597 A CN 101972597A
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- sulfur dioxide
- calcium sulfite
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- calcium oxide
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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
The present invention relates to inorganic chemical industry lithopone and make the comprehensive utilization technique field of scrap lead slag, especially a kind of form waste gas of sulfur dioxide with the lithopone controlling waste residue prepares the method for calcium sulfite.
Technical background
Lithopone is being commonly called as of white senior pigment lithopone, and its main raw materials for production are zinc oxide, sulfuric acid, barite and anthracite.Be to carry out metathesis reaction and make by barium sulphide and zinc sulphide.In the process that lithopone is produced, produce the various heavy waste residue, solid useless as lead skim, cadmia, cadmium slag, barium slag, cinder etc., annual generation accumulation has about last kiloton approximately, not only polluted agricultural land, environment, the growth that harms the crops, but also caused lead, pick, copper, zinc and germanium in the waste residue, sowed, pluged with molten metal, the waste of several metal element such as inscription.Resource and contaminated environment are so not only wasted in the most air storage of present this waste residue or fill a vacancy, pave the way.People have carried out a large amount of research for this reason, study producing multiple product in 1973 01 phases " fine-chemical intermediate " with the lithopone waste residue, " Hunan chemical industry " 1992 the 22nd the 1st phase of volume has also been reported " research of producing lead sulfate from lithopone acidleach waste residue ", but all also just be in theoretical research in the literary composition, also actual without comparison processing and utilize method, utilize electric arc furnaces to handle and make the waste residue that lithopone produced, it is a kind of fairly simple and effective method, but at present it is handled the waste gas that is produced in the waste residue process, go back neither one good treatment method.
Summary of the invention
The invention provides a kind of method for preparing calcium sulfite with form waste gas of sulfur dioxide, this method has effectively been administered and has been utilized electric arc furnaces to handle in the process of making the waste residue that lithopone produced, the sulfur dioxide toxic gas of being emitted also produces value products such as calcium sulfite simultaneously.
To achieve the above object, technical scheme of the present invention is:
A kind ofly prepare the method for calcium sulfite, comprise being prepared as follows step with form waste gas of sulfur dioxide:
Steps A, will prepare waste residue that lithopone produces and transfer in the electric arc furnaces and calcine, the calcining remaining solid is discharged standby;
Step B, the useless body of the sulfur dioxide that produced in the calcination process in the steps A is passed in the reactor that fills calcium oxide solution, the agitator that slowly starts in the reactor makes it carry out chemical reaction, and the pure mass ratio between described sulfur dioxide and the calcium oxide is 1: 0.94～1.34;
Step C, step B gained product is filtered with nutsch filter;
Step D, pass through washer, drier and pulverizer successively with filtering the filter cake obtain among the step C, wash, dry and pulverize after be packaged to be the calcium sulfite product.
Wherein, among the described step B, the mass concentration of calcium oxide solution is 20%～50%.
Among the described step B, reactor is an enamel reactor.
The present invention mainly is the sulfur dioxide gas of being emitted when utilizing the technology of calcium oxide solution processing and utilizing electric arc furnaces to extract lithopone waste residue heavy metal, and use these gases to prepare the calcium sulfite product, the present invention has not only effectively eliminated poisonous sulfur dioxide gas, and has prepared value product; Alleviate the waste gas environmental pollution and made value product again simultaneously, had remarkable social benefit and economic benefit; Especially technology and production equipment are simple, are a kind of relatively actual processing and utilize method.
Reaction principle of the present invention is:
CaO+SO
2＝＝＝＝＝CaSO
3
Description of drawings
Fig. 1 is the process chart for preparing the method for calcium sulfite with form waste gas of sulfur dioxide;
Wherein:
The 1-electric arc furnaces, 2-reactor, 3-nutsch filter, 4-evaporimeter, 5-cooling tower, 6-pulverizer, 7-calcium sulfite product.
Concrete embodiment
Embodiment 1
A kind ofly prepare the method for calcium sulfite, comprise being prepared as follows step with form waste gas of sulfur dioxide:
Steps A, will prepare waste residue that lithopone produces and transfer in the electric arc furnaces 1 and calcine, the calcining remaining solid is discharged standby;
Step B, toward 2 li of reactors that fill calcium oxide solution, with sulfur dioxide and the pure mass ratio of calcium oxide feeding in 1: 0.94 sulfur dioxide gas, the agitator that slowly starts 2 li of reactors makes it carry out chemical reaction; Wherein the mass concentration of calcium oxide solution is 20%; Calculate by pure 600kg calcium oxide solution during calculating; The promptly actual calcium oxide that reacts with sulfur dioxide gas is 120kg;
Step C, step B gained product is filtered with nutsch filter 3;
Step D, pass through washer 4, drier 5 and pulverizer 6 successively with filtering the filter cake obtain among the step C, wash, dry and pulverize after be packaged to be 141.02kg calcium sulfite product 7.
A kind ofly prepare the method for calcium sulfite, comprise being prepared as follows step with form waste gas of sulfur dioxide:
Steps A, will prepare waste residue that lithopone produces and transfer in the electric arc furnaces 1 and calcine, the calcining remaining solid is discharged standby;
Step B, toward 2 li of reactors that fill calcium oxide solution, with sulfur dioxide and the pure mass ratio of calcium oxide feeding in 1: 1.14 sulfur dioxide gas, the agitator that slowly starts 3 li of reactors makes it carry out chemical reaction; Wherein the mass concentration of calcium oxide solution is 30%; Calculate by pure 600kg calcium oxide solution during calculating; The promptly actual calcium oxide that reacts with sulfur dioxide gas is 180kg;
Step C, step B gained product is filtered with nutsch filter 3;
Step D, pass through washer 4, drier 5 and pulverizer 6 successively with filtering the filter cake obtain among the step C, wash, dry and pulverize after be packaged to be 257.13kg calcium sulfite product 7.
Embodiment 3
A kind ofly prepare the method for calcium sulfite, comprise being prepared as follows step with form waste gas of sulfur dioxide:
Steps A, will prepare waste residue that lithopone produces and transfer in the electric arc furnaces 1 and calcine, the calcining remaining solid is discharged standby;
Step B, toward 2 li of reactors that fill calcium oxide solution, with sulfur dioxide and the pure mass ratio of calcium oxide feeding in 1: 1.34 sulfur dioxide gas, the agitator that slowly starts 2 li of reactors makes it carry out chemical reaction; Wherein the mass concentration of calcium oxide solution is 50%; Calculate by pure 600kg calcium oxide solution during calculating; The promptly actual calcium oxide that reacts with sulfur dioxide gas is 300kg;
Step C, step B gained product is filtered with nutsch filter 3;
Step D, pass through washer 4, drier 5 and pulverizer 6 successively with filtering the filter cake obtain among the step C, wash, dry and pulverize after be packaged to be 428.55kg calcium sulfite product 7.
The foregoing description is preferred embodiment of the present invention, is not to be used for limiting the scope of the present invention, so all equivalences of being done with described feature of claim of the present invention and principle change or modify, all should be included within the claim scope of the present invention.
Claims (3)
1. one kind prepares the method for calcium sulfite with form waste gas of sulfur dioxide, it is characterized in that, comprises being prepared as follows step:
Steps A, will prepare waste residue that lithopone produces and transfer in the electric arc furnaces (1) and calcine, the calcining remaining solid is discharged standby;
Step B, the useless body of the sulfur dioxide that produced in the calcination process in the steps A is passed into reactor (2) lining that fills calcium oxide solution, the agitator that slowly starts reactor (2) lining makes it carry out chemical reaction, and the pure mass ratio between described sulfur dioxide and the calcium oxide is 1: 0.94～1.34;
Step C, step B gained product is filtered with nutsch filter (3);
Step D, pass through washer (4), drier (5) and pulverizer (6) successively, wash, be packaged to be calcium sulfite product (7) after the dry and pulverizing filtering the filter cake obtain among the step C.
2. according to claim 1ly prepare the method for calcium sulfite, it is characterized in that among the described step B, the mass concentration of calcium oxide solution is 20%～50% with form waste gas of sulfur dioxide.
3. according to claim 1ly prepare the method for calcium sulfite, it is characterized in that among the described step B, reactor is an enamel reactor with form waste gas of sulfur dioxide.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105192033A CN101972597A (en) | 2010-10-25 | 2010-10-25 | Method for preparing calcium sulfite by utilizing sulfur dioxide waste gas |
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| CN2010105192033A CN101972597A (en) | 2010-10-25 | 2010-10-25 | Method for preparing calcium sulfite by utilizing sulfur dioxide waste gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451163A (en) * | 2014-12-15 | 2015-03-25 | 湖南省加嘉锑业科技有限公司 | Heavy metal treatment device |
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2010
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451163A (en) * | 2014-12-15 | 2015-03-25 | 湖南省加嘉锑业科技有限公司 | Heavy metal treatment device |
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Application publication date: 20110216 |