Method for synchronously electrolyzing metal lead and manganese dioxide in chloride medium

A technology of manganese dioxide and metal lead, applied in the electrolysis process, electrolysis components, process efficiency improvement, etc., can solve problems such as waste of electric energy, achieve the effects of reducing tank pressure, improving utilization level, and saving energy

Inactive Publication Date: 2007-12-12
SHENYANG RES INST OF NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is just to overcome above-mentioned deficiency that prior art exists, for PbCl 2 The anode of aqueous solution electrolysis releases chlorine gas to pollute the environment and MnCl 2 Hydrogen gas is precipitated at the cathode of aqueous solution electrolysis, and electric energy is wasted in vain. A new method for simultaneously electrolytically extracting metallic lead and manganese dioxide from the chloride salt medium is proposed.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] First prepare PbCl by steps 1 and 2 of the present invention 2 and MnCl 2 , and then the quantitative PbCl 2 Soluble in MnCl containing NaCl 2 Diaphragm-free electrolysis is carried out in the solution. The electrolyte composition is: manganese concentration 55g / L, lead concentration 15g / L, NaCl concentration 2mol / L, hydrochloric acid concentration 4g / L, no additives are added to the electrolyte, and the current density is 70A / L m 2 The electrolysis ends after 2 hours at an electrolyte temperature of 85°C. The cathode product is washed three times with hot water at 40-50°C and then dried. The anode product is processed according to the conventional treatment process for electrolytic manganese dioxide finished products, and the obtained cathode current efficiency can reach 95. % or more, the anode current efficiency can reach more than 90%, and the resulting cathode lead is denser, with less dendrites and bright metallic luster; the anode MnO 2 The deposition is unif...

Embodiment 2

[0035] First prepare PbCl by steps 1 and 2 of the present invention 2 and MnCl 2 , and then the resulting PbCl 2 and MnCl 2 The solution is electrolyzed with a cloth bag diaphragm. The cloth bag is made of high-strength polyester cotton. The composition of the electrolyte in the cathode chamber: lead concentration 20g / L, NaCl concentration 4mol / L, hydrochloric acid concentration 4g / L, no glue additives, and electrolyte composition in the anode chamber : The concentration of manganese is 50g / L, the concentration of hydrochloric acid is 8g / L, the temperature of the electrolyte in the cathodic chamber is controlled at 80°C, the temperature of the electrolyte in the anode chamber is slightly lower at 75-78°C, and the current density of the cathode and the anode are consistent, both being 80A / m 2 , the electrolysis ends after 5 hours. The cathode product is washed three times with hot water at 40-50°C and then dried. The anode product is processed according to the conventional ...

Embodiment 3

[0037] First prepare PbCl by steps 1 and 2 of the present invention 2 and MnCl 2 , and then the resulting PbCl 2 and MnCl 2 The solution is electrolyzed with a cloth bag diaphragm, the cloth bag is made of cotton canvas, the composition of the electrolyte in the cathode chamber: lead concentration 15g / L, the concentration of NaCl 4.5mol / L, the concentration of hydrochloric acid 2g / L, no glue additives, the composition of the electrolyte in the anode chamber: manganese The concentration of hydrochloric acid is 50g / L, the concentration of hydrochloric acid is 4g / L, the temperature of the electrolyte in the cathodic chamber is controlled at 70°C, and the temperature of the electrolyte in the anode chamber is slightly lower, which is 65-67°C. The cathode current density and the anode current are consistent, both are 80A / m 2 , the electrolysis ends after 5 hours. The cathode product is washed three times with hot water at 40-50°C and then dried. The anode product is processed acc...

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Abstract

The invention relates to a method for electrolyzing metal lead and manganese dioxide in chlorine salt medium. It comprises following steps: preparing PbCl2: conversing concentrate lead sulfide to lead dichloride through ferric chloride at low temperature, separating lead dichloride from other components through flotation; preparing MnCl2: enriching manganese ore, immersing in hydrochloric acid to get MnCl2 solution; it is characterized in that it aslo comprises electrolyzing mixed solution of PbCl2 and MnCl2, the metal lead is decoded on stainless steel cathode, MnO2 is decoded on ruthenium dioxide coating anode. The invention is characterized by low requirement for device and process, high anode and cathode current efficiency, stable electrolyser voltage, reusable hydrochloric acid and sodium chloride generated during electrolysis, reduced production cost and wastewater discharge.

Description

technical field [0001] The invention relates to a hydrometallurgical process for extracting metallic lead and manganese dioxide, in particular to a method for simultaneous electrolysis of metallic lead and manganese dioxide in a chloride salt medium, that is, lead chloride, sodium chloride and chloride The manganese mixed solution is electrolyzed in the same electrolytic cell, lead and manganese are precipitated at the same time, the process of producing metallic lead on the cathode and manganese dioxide on the anode belongs to the non-ferrous hydrometallurgy technology. Background technique [0002] Today's lead smelting process is in a period of change, and the traditional pyro-method lead smelting process has been restricted in countries all over the world due to environmental pollution and lead poisoning. Although some modern fire-method lead smelting technologies such as Kivcet, QSL, and bottom-blowing lead smelting have solved the problem of acid treatment in lead smel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/18C25B1/21
CPCY02P10/20
Inventor 王德全舒方霞刘瑶尹文新丛自范李辉
Owner SHENYANG RES INST OF NONFERROUS METALS
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