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Method for removing chlorine from chlorine-containing zinc sulfate solution by using bismuth trioxide

A technology of bismuth trioxide and zinc sulfate solution is applied in directions such as improving process efficiency, can solve problems such as low chloride ion content, low chlorine removal efficiency, large economic burden, etc., and achieves high efficiency, low cost, and loss of bismuth. small effect

Active Publication Date: 2011-08-17
YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only has a low chlorine removal efficiency of only about 50%, but also consumes a lot of water for resin regeneration, and the chlorine ion content of the regenerated liquid is low, which brings a greater economic burden to the next step of regenerated liquid treatment.

Method used

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  • Method for removing chlorine from chlorine-containing zinc sulfate solution by using bismuth trioxide
  • Method for removing chlorine from chlorine-containing zinc sulfate solution by using bismuth trioxide

Examples

Experimental program
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example 1

[0033] 1. Dilute sulfuric acid conversion: 584mL of 60g / L dilute sulfuric acid solution prepared with tap water was added to a 1000mL beaker, the stirrer was started, 58.4g of analytically pure bismuth trioxide was slowly added to the beaker, heated to 60°C, and then concentrated h 2 SO 4 Keep the system content at 45g / L, filter the analysis solution after 60min (filtrate volume: 546mL, H 2 SO 4 : 45.8g / L, Bi: 532.34mg / L).

[0034]2. Chlorine removal: take 4000mL of zinc neutral leaching solution (Zn: 113g / L, Cl - : 2.20g / L, pH: 5.0) put it into a 5000mL beaker, start the stirrer, add dilute sulfuric acid to convert all bismuth subsulphate monohydrate [Bi(OH)SO 4 ·H 2 O] The feeding amount is equivalent to the removal of Cl - The required theoretical amount was filtered and washed after 60 minutes. Analyze the dechlorinated liquid (volume: 4020mL, Zn: 101.5g / L, Cl - : 199.23mg / L, Bi: 5.37mg / L, H 2 SO 4 : 3.25g / L). After washing (volume: 235mL, Zn: 44.59g / L, Cl - : ...

example 2

[0037] 1. Conversion of dilute sulfuric acid: 584mL of 70g / L dilute sulfuric acid solution prepared with tap water was added to a 1000mL beaker, the stirrer was started, and 58.4g of analytically pure bismuth trioxide was slowly added to the beaker, heated to 50°C, and then concentrated h 2 SO 4 Keep the system content at 55g / L, filter the analysis solution after 30min (filtrate volume: 526mL, H 2 SO 4 : 54.38g / L, Bi: 6144.34mg / L).

[0038] 2. Chlorine removal: take 4000mL of zinc neutral leaching solution (Zn: 113g / L, Cl - : 2.20g / L, pH: 5.0) into a 5000mL beaker, start the stirrer, add dilute sulfuric acid to convert all bismuth subsulfate monohydrate [Bi(OH)SO 4 ·H 2 O] The feeding amount is equivalent to the removal of Cl - The required theoretical amount was reacted at room temperature for 80 minutes and then filtered and washed. Analyze the dechlorinated liquid (volume: 4025mL, Zn: 102.35g / L, Cl - : 202.45mg / L, Bi: 4.85mg / L, H 2 SO 4 : 3.14g / L). After washing ...

example 3

[0041] 1. Conversion of dilute sulfuric acid: use tap water to make 1035mL of 40g / L dilute sulfuric acid solution into a 2000mL beaker, start the stirrer, slowly add 69g of analytically pure bismuth trioxide into the beaker, heat to 70°C, and then add concentrated H 2 SO 4 Keep the system content at 40g / L, filter the analysis solution after 90min (filtrate volume: 1000mL, H 2 SO 4 : 39.8g / L, Bi: 332.0mg / L).

[0042] 2. Chlorine removal: take 1000mL of the zinc extraction stock solution of the zinc electrolysis system (Zn: 24.80g / L, Cl - : 10.35g / L, pH: 5.0) into a 1000mL beaker, start the stirrer, add dilute sulfuric acid to convert all bismuth subsulfate monohydrate [Bi(OH)SO 4 ·H 2 O] The feeding amount is equivalent to the removal of Cl - The required theoretical amount was reacted at 60°C for 70 minutes and then filtered and washed. Analyze the dechlorinated liquid (volume: 1038mL, Zn: 22.43g / L, Cl - : 270.0mg / L, Bi: 20.44mg / L, H 2 SO 4 : 14.03g / L). After washing...

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Abstract

The invention relates to a method for purifying and separating chloride ions in chlorine-containing zinc sulfate solution in the zinc electrolyzing process, which belongs to a hydrometallurgical technology. The method comprises the following steps of: putting bismuth trioxide into 40 to 80 g / L of dilute sulphuric acid solution; converting into monohydrate basic bismuth sulfate precipitation; separating the dilute sulphuric acid solution from monohydrate basic bismuth sulfate; circulating the dilute sulphuric acid solution; putting the monohydrate basic bismuth sulfate into chlorine-containingzinc sulfate; stirring and dissolving to make Bi<3 +> re-complexed with Cl<-> in the solution to form bismuth oxychloride precipitation; putting the separated bismuth oxychloride into alkali solutionat the concentration of between 35 and 70 g / L in which bismuth trioxide seed crystals participate; converting into bismuth trioxide crystal precipitation and making Cl elements freed in the solution in an ion state; separating the bismuth trioxide from chloride solution; circulating the bismuth trioxide; and evaporating crystals to obtain solid chloride when the chloride solution is circulated toa set concentration. The method is low in operation cost, high in efficiency and low in bismuth loss.

Description

technical field [0001] The invention relates to a method for purifying and separating chloride ions in a chlorine-containing zinc sulfate solution in a zinc electrolysis process, which belongs to the hydrometallurgical technology. Background technique [0002] In the field of zinc hydrometallurgy, for a long time, the purification and separation of chloride ions in chlorine-containing zinc sulfate solution have been mainly adopted: ① silver sulfate precipitation method, ② copper slag dechlorination method and ③ ion exchange method. [0003] The main reaction formula of silver sulfate precipitation method is as follows: [0004] Ag 2 SO 4　 +2NaCl=Na 2 SO 4　 +2AgCl↓ . [0005] The silver sulfate precipitation method is to add silver sulfate to the chlorine-containing solution to make it react with chloride ions to form insoluble silver chloride precipitates. Although the method is simple to operate and has good chlorine removal effect, it is economically unreasonable bec...

Claims

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Application Information

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IPC IPC(8): C22B19/00C22B3/46
CPCY02P10/20
Inventor 罗玉德
Owner YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD