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Method for preparing positive plate for electrolyzing manganese dioxide

A technology for electrolyzing manganese dioxide and anode plates, which is applied to electrodes, electrolysis processes, electrolysis components, etc., can solve the problems of large-scale anode plates, limited application scope, unstable electrical contact, etc. Reduce production costs and achieve the effect of semi-continuous production

Active Publication Date: 2012-07-04
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ordinary vacuum sintering process requires large equipment investment, low production efficiency, and high preparation costs. The titanium-manganese anodes produced are fastened by bolts, and the electrical contact is not reliable. It needs to be reassembled from time to time, which also affects the large size of the anode plate. , thus limiting its scope of application

Method used

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  • Method for preparing positive plate for electrolyzing manganese dioxide
  • Method for preparing positive plate for electrolyzing manganese dioxide
  • Method for preparing positive plate for electrolyzing manganese dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The metal powder components are titanium and manganese, and the weight percentages of each component are as follows: titanium: 50%, manganese: 50%. Polyvinyl alcohol and water are prepared into an aqueous solution of a binder at a mass ratio of 1:100, and then metal powder is added to an aqueous solution of a binder 5 times the weight of the metal powder, stirred evenly, and then coated with a spray gun and pressed into an NW combination Type 1350mm×84mm×1.5mm pure titanium plate surface, leave 10mm at the lower end without coating, place it in a vacuum storage tank at room temperature after drying, and evacuate to 10 -5 Pa was filled with argon gas protection, and then the titanium plate coated with metal powder was continuously pulled to be heated by a constant temperature vacuum heating furnace located directly above the vacuum storage tank. When pulling, the effective heating time of each part of the workpiece is guaranteed to be 10 minutes. After heating, it is qui...

Embodiment 2

[0030] Other process conditions are the same as in Example 1, the constant temperature is 1300° C., and the determination of the pulling speed: ensure that the effective heating time of each part of the workpiece is 15 minutes. Under normal industrial electrolysis conditions, the current density is 100A / m 2 , the tank voltage is stable between 2.5 and 2.8 volts; the electrolytic manganese dioxide product has a good appearance.

Embodiment 3

[0032] Other process conditions are the same as in Example 1, the constant temperature is 1200° C., and the determination of the pulling speed: ensure that the effective heating time of each part of the workpiece is 30 minutes. Under normal industrial electrolysis conditions, the current density is 100A / m 2 , the tank voltage is stable between 2.6 and 2.9 volts; the appearance of the electrolytic manganese dioxide product is good.

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Abstract

The invention discloses a method for preparing positive plates for electrolyzing manganese dioxide, which belongs to the technical field of preparation of positive plates for electrolysis. The preparation method comprises the steps of coating a layer of metal powder on the surface of a titanium plate; conducting high-temperature vacuum pulling-sintering to the titanium plate coated with metal powder to form a compound positive strip with metal coating on the surface and titanium in the center; and conducting welding assembly and aluminum-casting assembly to a plurality of compound positive strips to obtain the positive plates, wherein the high-temperature vacuum pulling-sintering is carried out at the temperature of 1000 to 1400 DEG C; and the pulling speed is controlled to ensure that the effective heating time of each part of work pieces is between 5 and 120 minutes. The positive plate prepared by the method for electrolyzing manganese dioxide has high anti-passivation property, andbath voltage of the positive plate is lower than that of the pure titanium positive plate by more than 0.5 to 1 volt; after being discharged from a trough by electrolysis, the positive plates can be directly put in the trough to continue the electrolysis of the next cycle, without depassivation processes such as sand-blasting or anti-electrolysis and the like; therefore, the production efficiencyis high and the manufacturing cost is low; and the positive plates are ideal positive plates for electrolyzing manganese dioxide.

Description

technical field [0001] The invention belongs to the technical field of anode plate preparation for electrolysis, in particular to a method for preparing an anode plate for electrolytic manganese dioxide. Background technique [0002] The production of manganese dioxide, manganese, copper, cobalt, nickel, zinc and other materials by electrolysis is a method commonly used in industry. Due to the precipitation of oxygen or chlorine at the anode during the electrolysis process, there are higher requirements for the anode used. [0003] Since the industrial production of manganese dioxide by electrolysis, the anodes used have gone through the development process of graphite, lead-silver alloy, pure titanium, titanium-manganese-chromium-iron quaternary alloy and titanium-manganese coated anode. At present, graphite and lead-silver alloy anodes have been completely eliminated. [0004] Pure titanium has its unique advantages as a substitute for graphite and lead-silver alloy anod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/02C25B11/10C25B1/21
Inventor 沈化森张恒胡永海王占祥
Owner 有研资源环境技术研究院(北京)有限公司
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