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Impurity removal method of electrolytic manganese dioxide

A technology of electrolytic manganese dioxide and manganese dioxide, applied in the direction of manganese oxide/manganese hydroxide, electrolytic components, electrolytic process, etc., can solve the problems of large water consumption, long soaking time, poor washing effect of impurities, etc., and achieve Good effect, short processing time, and the effect of improving discharge performance

Active Publication Date: 2015-01-28
GUANGXI GUILIU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The past industrial production method is to use hot water, stir and soak for a long time and repeatedly wash repeatedly, and then filter. The disadvantage of this method is that it consumes a lot of water, soaks for a long time, and the effect of washing out impurities is not good.

Method used

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  • Impurity removal method of electrolytic manganese dioxide

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Effect test

Embodiment 1

[0019] A method for removing impurities from electrolytic manganese dioxide, which is carried out according to the following steps: crush the manganese dioxide peeled off from the anode to 200 mesh, add dilute sulfuric acid and nitric acid with 2.0% of the mass of manganese dioxide, mix well, dilute sulfuric acid and nitric acid The mass ratio is 1:0.3, the concentration of dilute sulfuric acid is 0.05mol / L, and the mass percentage of nitric acid is 4%; after mixing evenly, place the manganese dioxide at 250°C for 40min and then burn it at 5°C / min. Speed ​​is cooled to 80 ℃, filters after cooling, and the manganese dioxide that filter stays pickles with dilute sulfuric acid, after pickling, mix with a small amount of water (in the present invention, there is no limitation for the proportioning of manganese dioxide and water, as long as the Add the water in the container to cover the electrolytic manganese dioxide), heat to 70°C with microwave, microwave power is 300W, and use 3...

Embodiment 2

[0021] A method for removing impurities from electrolytic manganese dioxide, which is carried out according to the following steps: crush the manganese dioxide peeled off from the anode to 300 mesh, add dilute sulfuric acid and nitric acid with 1.5% of the mass of manganese dioxide, mix evenly, dilute sulfuric acid and nitric acid The mass ratio is 2:0.3, the concentration of dilute sulfuric acid is 0.08mol / L, and the mass percentage of nitric acid is 3%; after mixing evenly, place manganese dioxide at 240°C for 45min, and then burn it at 7°C / min. Speed ​​is cooled to 75 ℃, filters after cooling, and the manganese dioxide that filter stays pickles with dilute sulfuric acid, after pickling, mixes with a small amount of water (in the present invention, there is no limit for the proportioning of manganese dioxide and water, as long as the Add the water in the container to cover the electrolytic manganese dioxide), heat to 60°C with microwave, microwave power is 250W, and use 35KHz...

Embodiment 3

[0023] A method for removing impurities from electrolytic manganese dioxide, which is carried out according to the following steps: crush the manganese dioxide peeled off from the anode to 400 mesh, add dilute sulfuric acid and nitric acid with 1.0% of the mass of manganese dioxide, mix well, dilute sulfuric acid and nitric acid The mass ratio is 1.5:0.3, the concentration of dilute sulfuric acid is 0.10mol / L, and the mass percentage of nitric acid is 2.5%; after mixing evenly, place the manganese dioxide at 230°C for 50 minutes, and then burn it at 8°C / min. Speed ​​is cooled to 70 ℃, filters after cooling, and the manganese dioxide that filter stays pickles with dilute sulfuric acid, after pickling, mix with a small amount of water (in the present invention, there is no limitation for the proportioning of manganese dioxide and water, as long as the Add the water in the container to cover the electrolytic manganese dioxide), heat to 50°C with microwave, microwave power is 200W,...

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Abstract

The invention discloses an impurity removal method of electrolytic manganese dioxide. The method comprises the following steps: crushing manganese dioxide falling from anodes, adding dilute sulfuric acid and nitric acid, mixing evenly, sintering the mixture at 200-250 DEG C for 40-50 minutes, cooling the mixture to 70-80 DEG C at a speed of 5-10 DEG C / min, filtering, pickling manganese dioxide left after the filtering treatment by using the dilute sulfuric acid, mixing the pickled manganese dioxide with a small amount of water, heating to 50-70 DEG C through microwave, treating with 30-40 KHz ultrasonic wave for 10-20 minutes, drying, and treating the dry manganese dioxide in a dry magnetic separator for 0.5-2 hours to obtain refined manganese dioxide. The method can be used for not only effectively removing such impurities in the electrolytic manganese dioxide as low-valent manganese oxide, lead, copper, sulfate radical, molybdenum and iron, but also improving the discharge performance of the electrolytic manganese dioxide.

Description

technical field [0001] The invention belongs to the field of post-treatment of electrolytic manganese dioxide, in particular to a method for removing impurities of electrolytic manganese dioxide. Background technique [0002] At present, zinc-manganese batteries are still the most important chemical power sources. Because the battery has the characteristics of good discharge performance, easy to carry, easy to use, safe and reliable, and low price, it is widely used in small household appliances, toys, instruments and meters, etc. The battery is a disposable battery composed of manganese dioxide as the anode material, metal zinc as the negative electrode material, and some auxiliary materials. The earliest battery anode material was obtained by beneficiating natural manganese dioxide, but due to its low grade, high impurity content, and complex structure, the discharge performance of the battery was not ideal. In the early 1960s, electrolytic manganese dioxide (also known ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02C25B1/21
Inventor 吴元花涂忠益梁乐忠黄庆强罗冰徐星意
Owner GUANGXI GUILIU CHEM CO LTD
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