Method for removing anode slime of porous anode

A technology of porous anode and anode slime, applied in the fields of materials, chemical industry and metallurgy, can solve the problem of inappropriate porous anode, and achieve the effect of being suitable for industrial application, simple method and excellent porous interface

Active Publication Date: 2014-11-05
CENT SOUTH UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing anode slime removal method is not suitable for porous anodes, and provide a simple, efficient, economical and environmentally friendly method for removing porous anode slime

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The porous anode plate to which the anode slime was attached was taken out from the electrolyzer and weighed, and it was 25.3 kg. Add ferrous sulfate to the electrolytic waste liquid containing 170g / L of sulfuric acid, control the concentration of ferrous sulfate to 15g / L, and prepare a reducing solution at a temperature of 50°C. The anode is immersed, and the reaction is accelerated by mechanical stirring, and the reaction time is 6h. Then, it was washed with clean water at 30°C for 2 hours, weighed, and it was 24.8kg, and 0.5kg of anode slime was removed.

Embodiment 2

[0022] The porous anode plate with the anode slime attached was taken out from the zinc electrolytic cell and weighed, which was 22.9 kg. Immerse the anode in the pre-iron removal solution of zinc wet process direct leaching containing sulfuric acid 20g / L and ferrous sulfate concentration of 3g / L. The system temperature is 70°C, stirred by liquid flow, and reacted for 12h. Then, it was washed with clean water at 50°C for 4 hours, weighed, and it was 22.3kg, and 0.6kg of anode slime was removed.

Embodiment 3

[0024] The porous anode plate to which the anode slime was attached was taken out from the electrolytic cell and weighed, and it was 24.4 kg. Use a spray gun to spray a solution containing 100g / L of hydrochloric acid and a concentration of 45g / L of ferrous chloride to the anode for 1.5h, the injection pressure is 2MPa, and the solution temperature is 25°C. Then it was ultrasonicated in clean water at 70°C for 2 hours, weighed, and it was 23.7kg, and 0.7kg of anode slime was removed.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for removing anode slime of a porous anode. The method aims to solve the problem that the anode slime using MnO2 as the main component is deposited gradually on the surface of and inside of the porous anode adopted in the zinc electrodeposition and manganese electrodeposition processes so as to block up holes. The method is essentially characterized in that n reducing agent is adopted to dissolve the anode slime in an acidic system. Due to the adoption of the method, a majority of the anode slime can be removed, the blocking to holes is eliminated, the interface resistance is reduced, the specific surface area of the anode plate is recovered, and the low-current density is maintained so that the advantage of the porous anode is developed. A solution obtained after reduction and a waste cleaning solution can be returned to an iron-removing process for cyclic circulation. The method disclosed by the invention has the advantages of simplicity, low cost, zero discharge, environmental friendliness and applicability to industrial application.

Description

technical field [0001] The invention relates to a method for removing porous anode slime, in particular to a method for removing porous anode slime for zinc electrowinning or manganese electrowinning, and relates to the technical fields of materials, chemical industry and metallurgy. Background technique [0002] Patent ZL200710034340.6 shows that when Pb or Pb-based alloy porous energy-saving anode is used in the zinc electrowinning process, it can reduce the real current density of the anode, reduce electrochemical polarization, reduce oxygen evolution overpotential, save energy consumption, and improve power efficiency. When used in electrowinning of Cu, Zn, Mn, Ni, Co, Cd, etc., the anode oxygen evolution overpotential can be reduced by 50-180mV, and the current efficiency can be increased by 1-10%. In addition, it can also reduce the creep and deformation of the anode, make the oxide film formed on the surface more compact, reduce the corrosion rate of the anode, and im...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02C25C1/10C25C1/16
CPCY02P10/20
Inventor 蒋良兴赖延清李劼刘业翔吕晓军洪波郝科涛李渊
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap