Method for producing mercury-free alkaline manganese electrolytic manganese dioxide

A technology of electrolytic manganese dioxide and production methods, applied in the direction of electrolysis process, electrolysis components, improvement of process efficiency, etc., can solve the problems of long turnaround time, low leaching rate, long process flow, etc., and achieve good economic and social benefits , reduce production costs, and shorten the process flow

Active Publication Date: 2010-11-24
GUANGXI NON FERROUS METALS GROUP HUIYUANMENGYE
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Problems solved by technology

[0003] At present, in the process of producing electrolytic manganese dioxide, manganese carbonate ore or manganese oxide ore is mainly used as raw material. In the process of smelting and production, domestic manganese carbonate ore is used as raw material. Due to the low content of manganese carbonate in the ore (below 30%), the consumption of manganese ore It is very large and the production cost is too high; using manganese oxide ore as raw material, the main process methods currently used are leaching liquid preparation after reduction and roasting of manganese oxide ore or using the "two-mine method" to produce electrolytic manganese dioxide, and leaching after reduction and roasting of manganese oxide ore The technical method of liquid preparation has the disadvantages of long process flow, high production cost, and easy pollution to the surrounding environment of the factory area; high-grade manganese oxide ore is used as raw material to produce electrolytic manganese dioxide by the "two-mine method", that is, two The manganese oxide ore is leached together with the reducing agent pyrite to prepare the solution. At present, the manganese ore in the domestic manganese metallurgy industry adopts a discontinuous leaching process, that is, the manganese ore is directly dissolved into the solution in only one leaching tank. This process is suitable for low-grade manganese ore with a grade of 25%. The following ores have disadvantages such as low leaching rate, long turnover time between materials between equipment, increased number of equipment and low utilization rate; and the use of such high-grade manganese ore resources (grade above 25%) is decreasing day by day, it will be difficult to long-term production
Guangxi is rich in manganese ore resources, but most of them are low-grade manganese ores, which are characterized by low manganese content and high impurity content, and have not been fully developed and utilized for a long time

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  • Method for producing mercury-free alkaline manganese electrolytic manganese dioxide

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Effect test

Embodiment 1

[0016] Mix manganese oxide ore powder containing 14.32% of manganese and pyrite powder with sulfur content of 44.54% at a dry ratio of 1:0.24, add water to 98% sulfuric acid to prepare a 100g / L dilute sulfuric acid solution, mix The final manganese oxide powder and pyrite powder and the prepared sulfuric acid are continuously added into the continuous leaching tank at the same time according to the ratio of 1:0.47, and are stirred continuously at the same time. The continuous leaching tank is composed of one leaching tank to form a one-stage continuous process. Leaching, the effective volume of the leaching tank is 1m 3 , the tank temperature is 95°C, the leaching reaction time is 3 hours from feeding to the material liquid coming out of the leaching tank, and when the pH value reaches 3 to 3.5, it indicates that the leaching reaction has been completed. Stir continuously during the reaction, and the material liquid flowing out of the leaching tank Enter the neutralization tan...

Embodiment 2

[0019] Mix manganese oxide ore powder containing 15.56% of manganese and pyrite powder with sulfur content of 40.54% according to the dry specific gravity of 1:0.24, add water to 98% sulfuric acid to prepare a 100g / L dilute sulfuric acid solution, mix The final manganese oxide powder and pyrite powder and the prepared sulfuric acid are continuously added into the continuous leaching tank at the same time according to the ratio of 1:0.47, and are stirred continuously at the same time. The continuous leaching tank is composed of three leaching tanks connected in series to form three Level continuous leaching, the effective volume of each leaching tank is 1m 3 , the material liquid enters the second-level leaching tank and then enters the third-level leaching tank. The temperature of each tank is 93°C. The leaching reaction time from feeding to the material liquid coming out of the third-level leaching tank is 3.5 hours. Stir continuously during the reaction , the feed liquid flo...

Embodiment 3

[0022] Mix manganese oxide ore powder containing 13.58% of manganese and pyrite powder with sulfur content of 47.44% according to the dry ratio of 1:0.24, add water to 98% sulfuric acid to prepare a 100g / L dilute sulfuric acid solution, mix The final manganese oxide powder and pyrite powder and the prepared sulfuric acid are continuously added into the continuous leaching tank at the ratio of 1:0.47 at the same time, and are stirred continuously at the same time. The continuous leaching tank is composed of seven leaching tanks connected in series to form seven leaching tanks. Level continuous leaching, the effective volume of each leaching tank is 1m 3, the feed liquid enters the second stage leaching tank and then enters the third to seventh stage leaching tanks. The temperature of each tank is 95°C. The leaching reaction time from feeding to feed liquid coming out of the seventh stage leaching tank is 4 hours. The reaction process Stirring continuously in the middle, the mat...

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Abstract

The invention discloses a method for producing mercury-free alkaline manganese electrolytic manganese dioxide, which comprises the following steps of: (1) mixing manganese oxide ore and iron pyrite, adding the mixture and sulfuric acid into a continuous leaching tank formed by connecting 1 to 7 stirring leaching tanks in series simultaneously and forming one-stage or multistage continuous leaching, and performing a process reaction at the temperature of between 90 and 95 DEG C for 3 to 4 hours to obtain solution of manganese sulfate; (2) purifying the solution of manganese sulfate for impurity removal; and (3) after performing ultrafiltration on the purified solution of manganese sulfate, heating the solution of manganese sulfate by a plate-type heat exchanger to 90 to 100 DEG C, allowing the solution to enter a head tank and adding a prepared suspending agent and a foaming agent simultaneously, supplying the mixture to each electrolytic bath through a pipeline, and electrolyzing to obtain the mercury-free alkaline manganese electrolytic manganese dioxide. The method has the advantages of wide adaptability of the manganese oxide ore, short process flow, low production cost and the like.

Description

technical field [0001] The invention relates to a production method of mercury-free alkaline manganese type electrolytic manganese dioxide, in particular to a method for producing mercury-free alkaline manganese type electrolytic manganese dioxide by leaching ultra-low-grade manganese oxide ore using the "two-mine method". Background technique [0002] As the high-power battery with the best performance and price ratio in the battery industry, alkaline manganese battery has stable working voltage, high current continuous discharge, excellent performance, long storage time (up to 3 to 5 years), low temperature performance and good leak-proof performance And other characteristics, welcomed by the vast number of consumers at home and abroad. Mercury-free alkaline manganese electrolytic manganese dioxide, the main raw material used in the production of alkaline manganese batteries, has a global annual consumption of more than 300,000 tons and is increasing at a rate of more than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C25B1/21
CPCC22B47/0081C22B3/20C22B3/08C22B47/00C25B1/21C22B3/44Y02P10/20
Inventor 陈奇志
Owner GUANGXI NON FERROUS METALS GROUP HUIYUANMENGYE
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