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Method for cleaning lead-based silicofluoric acid waste electrolyte

A technology of silicofluoric acid electrolysis and cleaning treatment, applied in the field of metallurgy, can solve problems such as the blank of cleaning treatment technology

Inactive Publication Date: 2011-02-09
深圳中金岭南有色金属股份有限公司韶关冶炼厂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the above-mentioned cleaning treatment technology for the waste electrolyte containing lead and zinc fluorosilicate is still blank.

Method used

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  • Method for cleaning lead-based silicofluoric acid waste electrolyte
  • Method for cleaning lead-based silicofluoric acid waste electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The chemical composition of a kind of bottom lead silicofluoric acid electrolysis waste liquid raw material is: the H of the Pb of 94.01 g / L, the Zn of 29.58 g / L, 206.08 g / L 2 SiF 6 , 1.375 g / L of In, sulfuric acid is used as the lead sinking agent, and the amount of sulfuric acid is determined according to the content of lead in the bottom lead fluorosilicic acid electrolysis waste liquid. The amount of sulfuric acid is 1.0 times of the theoretical amount. Sulfuric acid is added to the waste liquid raw material, the temperature is 5-20°C, the stirring time is 0.5h, and the clarification time is 1h, the lead in the solution can be removed to Pb<0.97g / L, the lead sinking rate is 98.67%, and the lead sinking rate is 98.67%. The concentration of In in the back liquid is 1.18g / L; extraction and recovery of indium, the extraction rate of indium can be as high as 99.84%, and the stripping rate is almost 100%; the raffinate is neutralized, and the neutralizing ag...

Embodiment 2

[0024] Embodiment 2: the chemical composition of a kind of bottom lead silicofluoric acid electrolytic waste liquid raw material is: the H of the Pb of 92.62 g / L, the Zn of 16.30 g / L, 238.82 g / L 2 SiF 6 , 0.036 g / L of In, using sulfuric acid as lead sinking agent, determine the amount of sulfuric acid according to the content of lead in the bottom lead fluorosilicic acid electrolysis waste liquid, add sulfuric acid, sulfuric acid in the above-mentioned bottom lead fluorosilicic acid electrolysis waste liquid raw material The dosage is 1.5 times of the theoretical dosage, the temperature is 25-35°C, the stirring time is 2 hours, and the clarification time is 5 hours. The lead in the solution can be removed to Pb<0.13g / L, and the lead sinking rate is 99.80%. The concentration of In in the back solution is 0.03g / L; the concentration of indium in the solution after the sinking of lead is low, so the process of extracting and recovering indium is not carried out in this embodiment,...

Embodiment 3

[0025] Embodiment 3: the chemical composition of a kind of bottom lead silicofluoric acid electrolytic waste liquid raw material is: the H of the Pb of 64.80 g / L, the Zn of 8.03g / L, 153.43g / L 2 SiF 6 , using phosphoric acid as the lead sinking agent, according to the content of lead in the bottom lead fluorosilicic acid electrolysis waste liquid to determine the amount of phosphoric acid, add phosphoric acid to the raw material of the above bottom lead silicofluoric acid electrolysis waste liquid, the amount of phosphoric acid is 2.0 times the theoretical amount , the temperature is 70-80°C, the stirring time is 4 hours, and the clarification time is 10 hours. The lead in the solution can be removed to Pb

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Abstract

The invention relates to a method for cleaning lead-based silicofluoric acid waste electrolyte, which comprises the following process steps: firstly, adding a lead removing agent into the lead-based silicofluoric acid waste electrolyte for removing lead, and neutralizing the lead depositing liquid after the lead removing treatment; then, extracting zinc in the neutralizing liquid by a composite extracting agent, back extracting zinc in the loaded organic phase circularly by sulfuric acid, and returning the zinc extracting liquid for preparing silicofluoric acid electrolyte; and when the concentration of the zinc in the back extracting liquid meets the zinc electro-deposition requirement, conveying the back extracting liquid for electrolyzing zinc or producing zinc products. The invention can efficiently, quickly and cleanly separate and enrich lead and zinc in the lead-based silicofluoric acid waste electrolyte to remove the lead and the zinc until the content of the lead and the content of the zinc are respectively lower than 1.0g / L and 0.5g / L; and simultaneously, the invention is combined with the existing zinc electro-deposition process, fully utilizes zinc resources and recycles zinc in an electrolytic form, and zinc electro-deposition waste liquid returns and is used as a back extracting agent of zinc, thereby realizing the closed cycle of processes and achieving the purpose of clean production.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for removing zinc in a fluorosilicic acid solution to meet the requirements of the lead electrolyte in a wide range of pH values, and to clean and treat bottom lead fluorosilicic acid electrolytic waste liquid. Background technique [0002] In the process of indium-rich lead electrolysis, the potential of zinc is more negative than that of lead, and zinc will be dissolved into the lead electrolyte. With the circulation of the electrolyte, the concentration of zinc ions in the electrolyte will be enriched and affect the current. At the same time, it will be precipitated at the cathode due to cathodic polarization or concentration polarization, thereby affecting the quality of electric lead. Therefore, it is necessary to open a part of the lead electrolyte, that is, to purify the electrolytic waste liquid to meet the requirements of lead electrolysis. At present, the abo...

Claims

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Application Information

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IPC IPC(8): C25C1/22C25C1/18
CPCY02P10/20
Inventor 何静刘明海吴斌秀唐谟堂赖复兴鲁君乐黄玲王涛唐朝波杨声海杨建广
Owner 深圳中金岭南有色金属股份有限公司韶关冶炼厂