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Dechlorination process in zinc hydrometallurgy

A technology of hydrometallurgy and dechlorination, applied in the direction of improving process efficiency, etc., can solve the problems of low silver regeneration capacity, complicated treatment process, poor dechlorination effect, etc., achieve control of chloride ion concentration, simple and good treatment method The effect of dechlorination effect

Inactive Publication Date: 2017-12-15
SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY
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Problems solved by technology

Among them, the ion exchange method uses the exchangeable ions of the exchange resin to exchange with the ions in the electrolyte, so that the chloride ions in the solution are adsorbed on the exchange resin, and the sulfate radicals on the resin enter the solution; the disadvantage of this method is the dechlorination effect poor
The reaction equation of the silver sulfate precipitation method is Ag 2 SO 4 +2Cl - =AgCl↓+SO 4 2- ; The disadvantage of this method is that the regeneration ability of silver is low, the cost is high, and it is difficult to practice in production
The reaction equation of cuprous chloride precipitation method is Cu+Cu 2+ +2Cl - =Cu 2 Cl 2 ↓, usually add copper slag, use the disproportionation reaction of copper to generate insoluble cuprous chloride precipitation to remove Cl - The disadvantage of this method is that when the chlorine in the stock solution is high, there are problems such as large output of copper slag, complicated treatment process, long time, high cost, etc., and it is not suitable for large flow production

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  • Dechlorination process in zinc hydrometallurgy

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Embodiment Construction

[0018] see figure 1 , which is a schematic diagram of the dechlorination process flow of the embodiment, comprising the following steps:

[0019] Dechlorination treatment: the leaching solution after roasting the zinc concentrate in the hydrometallurgy (the chlorine concentration of the leaching solution is 500-800mg / L, and the amount of the leaching solution is 360m 3 ) into the dechlorination tank, add bismuth oxide 63kg, following reaction takes place: Bi 2 o 3 +6H + =2Bi 3+ +3H 2 O; Bi 3+ +3Cl - =BiCl 3 ↓; BiCl 3 +H 2 O=BiOCl↓+2HCl. Control the reaction temperature at 60-75°C, and the reaction time at 40-60 minutes. Add basic zinc carbonate at the end of the reaction, adjust the pH value to 3.5-4.5, and continue the reaction for 15-20 minutes. After the reaction, the mixture is pumped to the Chlorine filter press filter to obtain BiOCl precipitation and dechlorination leaching solution (chlorine concentration is about 200mg / L); dechlorination leaching solution f...

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Abstract

The invention relates to a dechlorination process in zinc hydrometallurgy. The dechlorination process in the zinc hydrometallurgy comprises the following steps: (1) bismuth oxide is added in leaching liquid after roasting of zinc concentrates for dechlorination to obtain bismuth oxychloride precipitates and dechlorinated leaching liquid; (2) the bismuth oxychloride precipitates are added in alkali solution for alkali washing to obtain bismuth oxide and chloride solution; and (3) bismuth oxide obtained by alkali washing is added in the acid solution for acid washing to obtain bismuth ion solution; and the bismuth iron solution is returned into the leaching liquid after roasting of the zinc concentrates for dechlorination. The dechlorination process is excellent in dechlorination effect, simple in treatment method, short in circulation period and low in unit consumption of a dechlorinating agent, and can effectively control the system chlorine ion concentration.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a dechlorination process in zinc hydrometallurgy. Background technique [0002] Zinc hydrometallurgy mainly includes roasting, leaching, purification and electrowinning processes. After the zinc concentrate is roasted, the electrolytic waste liquid is used for neutral leaching to dissolve most of the zinc oxide. The obtained pulp is separated into supernatant and underflow pulp. After the clear liquid is purified, metal zinc is produced by electrowinning, which is melted and cast into sinking ingots. Chloride ions in the purified zinc solution will affect zinc electrowinning. The existence of chloride ions is easy to corrode the plate, accelerate the consumption of the plate, make it difficult to strip zinc, and reduce the quality of zinc after electrowinning. And when the content of chlorine element in the system reaches a certain value, it will cause severe corrosion to the syste...

Claims

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Application Information

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IPC IPC(8): C22B19/20C22B3/44
CPCC22B3/44C22B19/26Y02P10/20
Inventor 郑莉莉李昭刘野平张登凯李铭高艳芬曾日明胡凯
Owner SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY
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