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Method for deeply removing molybdenum from solution of manganese sulfate for electrolytic manganese dioxide

A technology of electrolytic manganese dioxide and manganese sulfate solution, which is applied in the direction of manganese sulfate, etc., can solve the problem of long molybdenum removal period, generation of SO2 gas, and difficult molybdenum removal depth to meet the requirements of electrolytic manganese dioxide for mercury-free zinc-manganese alkaline batteries and other problems, to achieve the effect of no secondary pollution and short time

Active Publication Date: 2015-06-17
GUANGXI GUILIU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that the molybdenum can only be removed when the pH value is low enough, and harmful SO is produced during the molybdenum removal process 2 gas
Ion exchange method, solvent extraction method and selective precipitation method are also commonly used molybdenum removal methods. The disadvantage of these methods is that the molybdenum removal cycle is long, and the depth of molybdenum removal is difficult to meet the requirements for the use of electrolytic manganese dioxide for mercury-free zinc-manganese alkaline batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for electrolyzing manganese dioxide with manganese sulfate solution to remove molybdenum, the steps are as follows:

[0016] (1) Take 0.07mol / L MnSO with a volume ratio of 1:1 4 solution and 0.05mol / L KMnO 4 The solution was shaken and mixed at room temperature, and allowed to stand for 30 minutes, and the resulting precipitate was new ecological manganese dioxide.

[0017] (2) Take a manganese sulfate solution with a mass concentration of 100g / L (the mass concentration of molybdenum is 0.008mg / L) and heat it to 80°C, adjust the pH value to 4.5, and then add new ecological dioxide with a mass concentration of 12g / L Manganese suspension 9mL, microwave radiation, the power of microwave radiation is 600W, the time of microwave radiation is 12min, then add filter aid diatomaceous earth and stir for 30min, then separate solid-liquid and press filter to get the filtrate to obtain purified manganese sulfate Solution, the mass concentration of residual molybdenum is ...

Embodiment 2

[0019] A method for electrolyzing manganese dioxide with manganese sulfate solution to remove molybdenum, the steps are as follows:

[0020] (1) Take 0.06mol / L MnSO with a volume ratio of 1:1 4 solution and 0.07mol / L of KMnO 4 Solution, shake and mix at room temperature, let it stand for 25 minutes, and the resulting precipitate is new ecological manganese dioxide.

[0021] (2) Take a manganese sulfate solution with a mass concentration of 110g / L (the mass concentration of molybdenum is 0.009mg / L) and heat it to 70°C, adjust the pH value to 4.0, and then add new ecological dioxide with a mass concentration of 10g / L Manganese suspension 10mL, microwave radiation, the power of microwave radiation is 400W, the time of microwave radiation is 15min, then add filter aid diatomaceous earth and stir for 30min, and then separate solid-liquid and press filter to get the filtrate to obtain purified manganese sulfate Solution, the mass concentration of residual molybdenum is 0.005mg / L. ...

Embodiment 3

[0023] A method for electrolyzing manganese dioxide with manganese sulfate solution to remove molybdenum, the steps are as follows:

[0024] (1) Take 0.08mol / L MnSO with a volume ratio of 1:1 4 solution and 0.04mol / L KMnO 4 The solution was shaken and mixed at room temperature, and left to stand for 35 minutes, and the resulting precipitate was new ecological manganese dioxide.

[0025] (2) Take a manganese sulfate solution with a mass concentration of 150g / L (the mass concentration of molybdenum is 0.010mg / L) and heat it to 80°C, adjust the pH value to 4.5, and then add new ecological dioxide with a mass concentration of 15g / L Manganese suspension 8mL, microwave radiation, the power of microwave radiation is 700W, the time of microwave radiation is 10min, then add filter aid diatomaceous earth and stir for 30min, then separate solid-liquid and press filter to get the filtrate to obtain purified manganese sulfate Solution, the mass concentration of residual molybdenum is 0.0...

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Abstract

The invention discloses a method for deeply removing molybdenum with a manganese sulfate solution for electrolytic manganese dioxide. After irradiation, add filter aid and stir for 30 minutes, and then separate solid and liquid to take filtrate to obtain purified manganese sulfate solution; the power of the microwave irradiation is 400-700W, and the time of microwave irradiation is 10-15 minutes. This method uses new ecological manganese dioxide as an adsorbent, and under the action of microwave radiation, the performance of molybdenum adsorption is greatly improved, the adsorption rate of molybdenum is above 99.0%, and the mass concentration of molybdenum in manganese sulfate solution after molybdenum removal is lower than 0.003mg / L, fully meet the requirements for the production of electrolytic manganese dioxide for mercury-free alkaline zinc-manganese batteries.

Description

technical field [0001] The invention belongs to the field of metal solution purification, in particular to a method for deeply removing molybdenum by using manganese sulfate solution for electrolytic manganese dioxide. Background technique [0002] The raw materials for the production of electrolytic manganese dioxide (EMD for short) are generally rhodochrosite, pyrolusite, manganese ore, etc., and the manganese sulfate solution is obtained through sulfuric acid leaching, which contains potassium, iron, cobalt, nickel, molybdenum and other impurity elements. Will enter the product EMD. Mercury-free batteries make molybdenum one of the most harmful impurities in EMD. The Mo content of electrolytic manganese dioxide for mercury-free alkaline zinc-manganese batteries is required to be less than 0.5ppm. Therefore, the molybdenum content in the manganese sulfate electrolyte for preparing electrolytic manganese dioxide must be kept below 0.003mg / L in order to ensure the electroly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/10
Inventor 覃胜先黄绍锋韦善良陈寿芬吴元花许雄新
Owner GUANGXI GUILIU CHEM CO LTD