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Preparation method for high-purity calcium thiosulfate and sulfur dioxide under wet-process condition

A technology of pure calcium thiosulfate and calcium thiosulfate, applied in the fields of thiosulfate/dithionite/polythionite, chemical instruments and methods, sulfur compounds, etc., can solve the problem of high raw material cost and source Narrow, low purity of calcium thiosulfate solution, etc., to achieve the effect of increasing production rate and cheap price

Inactive Publication Date: 2019-11-05
BACKFILL ENG LAB SHANDONG GOLD MINING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the cost of raw materials is relatively high and the source is relatively narrow; and the purity of the calcium thiosulfate solution prepared by this method is not high, and there are many impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1), ripening stage

[0039] Put 800ml of water in a beaker, add 100g of analytically pure CaO into the beaker, stir and react for 40 minutes to fully mature.

[0040] (2), sulfur-alkali treatment

[0041] Add 120g of elemental sulfur to the ripening preparation to stir and relax Ca(OH) 2 In the slurry, start stirring, adjust the temperature control of the water bath to 90°C, keep heating and stirring for 3 hours until all the sulfur is completely reacted to form a lime sulfur mixture. As the reaction proceeded, red marks gradually appeared in the slurry, and brown slurry was formed in 3 hours, and the final filtrate color was dark reddish brown. The molar ratio between elemental sulfur and calcium hydroxide is 2:1.

[0042] (3), oxidation reaction

[0043] Transfer the lime sulfur mixture to the oxidation reactor equipped with a bubble dispersing device, turn on the stirring and water bath temperature control device, adjust the temperature to 60°C, and then feed ox...

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Abstract

The invention relates to a preparation method for high-purity calcium thiosulfate and sulfur dioxide under the wet-process condition. Firstly, elemental sulfur and a Ca(OH)2 sizing agent are uniformlymixed, and through a heating reaction, a calcium polysulfide and calcium thiosulfate mixture, namely lime sulphur is obtained; then, under the heating and stirring conditions, oxygen is introduced into the lime sulphur, and through a reaction, calcium polysulfide is oxidized into calcium thiosulfate; the pH value is adjusted to be 7-9, a flocculating agent is added, and through filtration, a calcium thiosulfate solution is obtained. Calcium thiosulfate crystals or the calcium thiosulfate solution is acidized, and sulfur dioxide gas is obtained. According to the method, sulfur dioxide or sodium sulfite does not need to be used as the raw material, and the elemental sulfur and quick lime are directly utilized for producing the calcium thiosulfate solution; according to the method, the sulfur dioxide is prepared by adopting a wet process, and the safe and environment-friendly purpose is achieved. According to the method, the elemental sulfur, the lime and the oxygen are used as the raw materials, the cost is low, and production is conveniently conducted.

Description

Technical field [0001] The invention relates to a preparation method of calcium thiosulfate and sulfur dioxide. It belongs to the technical field of chemical agent preparation. Background technique [0002] Most of the existing thiosulfate preparation methods are based on the preparation of sodium thiosulfate, including the following: [0003] (1) Using sulfur dioxide prepared by burning S as raw material: After dissolving soda ash, it reacts with sulfur dioxide (generated by sulfur burning) to generate sodium sulfite, then adds sulfur for boiling reaction, and undergoes filtration, concentration, and crystallization to obtain sodium thiosulfate. [0004] Na 2 CO 3 +SO 2 ==Na 2 SO 3 +CO 2 [0005] Na 2 SO 3 +S+5H 2 O==Na 2 S 2 O 3 ·5H 2 O [0006] (2) Alkali sulfide method: Utilize the alkali sulfide evaporation residue, the sodium carbonate and sodium sulfide in the barium sulfide wastewater to react with the sulfur dioxide in the sulfur waste gas, and obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/64C01B17/50
CPCC01B17/64C01B17/508C01B17/503
Inventor 徐超高腾跃张文平陈艳波秦广林蔡明明
Owner BACKFILL ENG LAB SHANDONG GOLD MINING TECH CO LTD
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