Method for recovering manganese and magnesium from complex salt crystals generated in manganese electrolysis process

An electrolytic manganese and crystallization technology is applied in the field of recovering manganese and magnesium from the double salt crystallization produced by the electrolytic manganese process.

Inactive Publication Date: 2011-08-17
CHONGQING ACADEMY OF SCI & TECH
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This not only caused considerable adverse effects on the environment, but also caused a lot of waste of resources.

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  • Method for recovering manganese and magnesium from complex salt crystals generated in manganese electrolysis process
  • Method for recovering manganese and magnesium from complex salt crystals generated in manganese electrolysis process
  • Method for recovering manganese and magnesium from complex salt crystals generated in manganese electrolysis process

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Embodiment Construction

[0014] The method of reclaiming manganese and magnesium from the double salt crystallization that electrolytic manganese process produces (reference figure 2 ), the method includes dissolving the double salt crystals completely with hot water to obtain a solution containing manganese sulfate and magnesium sulfate (1). In the present invention, in the step (1), the mass ratio of the double salt crystals to hot water is 0.3~0.5:1; the method also has the following steps:

[0015] (2) filtering the solution obtained in step (1) for the first time to obtain the filtrate;

[0016] (3) Add oxidant ammonium persulfate to the filtrate obtained in step (2) and mix thoroughly to prepare manganese dioxide by reacting with manganese sulfate in the filtrate, wherein the ammonium persulfate is added according to 1 to 1.4 times the reaction amount , the pH value of the reaction process is controlled between 5 and 6;

[0017] In the filtrate of this step, the reaction formula of manganese ...

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Abstract

The invention discloses a method for recovering manganese and magnesium from complex salt crystals generated in the manganese electrolysis process, which is characterized by recovering manganese and magnesium from complex salt crystals in the mode of preparing manganese dioxide and magnesium oxalate. The method comprises the following steps: totally dissolving the complex salt crystals by hot water to obtain a solution containing manganese sulfate and magnesium sulfate; filtering the solution, and adding an oxidant ammonium persulfate in the obtained filtrate to prepare manganese dioxide; continuously filtering the solution, adding a precipitator oxalate dehydrate into the obtained filtrate to prepare magnesium oxalate; and then, filtering again to obtain a filtrate containing ammonium sulfate and the like, wherein the filtrate can be reused when electrolytic manganese is produced. The manganese dioxide and the magnesium oxalate obtained with the method are pure and can be directly used as other raw materials for industrial production. The method has the characteristics of small investment, low cost and simple technology and is easy to operate, and the recovery rates of manganese and magnesium are respectively 97.9% and 98.7%.

Description

technical field [0001] The invention relates to a method for treating double salt crystals produced in electrolytic manganese process. Background technique [0002] In the process of electrolytic manganese, the electrolytic manganese qualified liquid is continuously transported to the electrolytic cell through the liquid supply pipe, and at the same time, the anolyte is continuously drawn out from the electrolytic cell through the liquid discharge pipe. With this continuous liquid supply and The continuous liquid discharge method can ensure the continuity of the electrolytic manganese process. However, because the electrolytic manganese qualified solution contains manganese sulfate, ammonium sulfate and magnesium sulfate, they are very easy to form double salt crystals in the liquid supply pipe, especially the discharge pipe (see figure 1 ). With the gradual increase of this double salt crystallization, the pipeline may be blocked, which will eventually affect the normal o...

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Application Information

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IPC IPC(8): C22B7/00C22B26/22C22B47/00
CPCY02P10/20
Inventor 陶长元孙思刘仁龙刘作华刁术华唐申王联杜军范兴周小霞孙大贵左赵宏李敏陈燕
Owner CHONGQING ACADEMY OF SCI & TECH
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