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Process for removing chloride fromiznc electrolytic solution by using silver hydroxide

A technology of electrolysis of silver hydroxide and zinc, which is applied in the direction of photographic process, photographic auxiliary process, process efficiency improvement, etc. It can solve the problems of difficult process conditions, low chlorine removal efficiency, high operating cost, etc.

Inactive Publication Date: 2008-06-11
YUNNAN AOSIDI INDAL
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Problems solved by technology

[0008] 1. Ion exchange method: Its principle is to use ion exchange resin to adsorb and remove chlorine in the electrolyte, but the efficiency of chlorine removal is not high and the operation cost is high, so it is rarely used in actual production.
[0009] 2. Copper slag dechlorination method: Its principle is based on the interaction between copper and copper ions and chloride ions in the electrolyte to form insoluble cuprous chloride precipitation, but the dechlorination efficiency of this method is not high, and the process conditions Difficult to master, high production cost, less used in actual production

Method used

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  • Process for removing chloride fromiznc electrolytic solution by using silver hydroxide

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Embodiment Construction

[0015] After the zinc sulfate leaching solution containing chloride ions is purified by the conventional three-stage zinc powder method, it is put into the 50m of the dechlorination workshop. 3 In the stirred tank, analyze the chlorine content of the solution, according to the reaction formula AgOH+Cl - =AgCl↓+OH - Calculate and add a certain amount of silver hydroxide, and after stirring for 30 minutes, take a sample to analyze the residual chlorine content in the solution, control the residual chlorine content of the solution in the range of 50-200 mg / liter, and then use the solution with 25m 2 The filter press is used to filter the solution, and the solution is sent to the electrolytic workshop to deposit zinc. The silver chloride slag obtained by filtering the filter press adopts a mature conventional method, namely: iron powder is replaced to obtain silver powder, silver powder is added with nitric acid to obtain silver nitrate, silver nitrate is added with sodium hydrox...

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Abstract

The invention relates to a technology to deprive chlorine from zinc electrolytic solution by silver hydroxide. It includes the following steps: using zinc oxide as raw material to form zinc sulfate leach solution that contains chlorine over 200mg / L, adding silver hydroxide into the solution, whisking for 30 minutes, after qualifying, filtering the solution, and the filtrate could be used to produce deposition zinc product, the leached residue is silver oxide that could be recycled.

Description

technical field [0001] The invention relates to the purification technology of electrolyte in zinc hydrometallurgy, in particular to a process for removing chlorine in zinc electrolytic solution using silver hydroxide. Background technique [0002] At present, more than 75% of zinc in my country is produced by the hydrometallurgy process. In the process of hydrometallurgy, the purification of zinc sulfate leaching solution is very important. The copper, cadmium, cobalt, nickel and fluorine in the leaching solution Harmful impurities such as chlorine and chlorine must be purified to below the allowable content, so that the electrodeposited zinc process can proceed smoothly, and the electrodeposited zinc sheet product will be qualified. [0003] When the chlorine content in the zinc sulfate leaching solution exceeds 200 mg / L, the electrolysis process will be manifested as the "burning plate" phenomenon of the anode plate being dissolved, the electric efficiency will decrease, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/46C25C1/16C22B19/00
CPCY02P10/20
Inventor 杨开黔郑军伟
Owner YUNNAN AOSIDI INDAL
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