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A method for removing impurity magnesium in electrolytic manganese system by utilizing fluorine-containing minerals

A technology of electrolytic manganese and minerals, applied in the field of metallurgy, can solve the problems of low precipitation efficiency and high price, and achieve the effects of abundant sources, reduced cost of magnesium removal, and simple operation

Active Publication Date: 2018-01-09
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to magnesium ammonium sulfate double salt crystallization method, extraction method, recrystallization and other magnesium removal methods, a lot of research has been done on chemical precipitation methods. Precipitants mainly include fluoride, oxalate, carbonate, phosphate and composite precipitation. However, the above-mentioned precipitants generally have factors such as high price, low precipitation efficiency, or the introduction of other impurities
Therefore, there is no economically feasible method for the removal of impurity magnesium in the electrolytic manganese system.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method of the present invention utilizing fluorine-containing minerals to remove impurity magnesium in the electrolytic manganese system comprises the following steps:

[0028] 1) First mix amorphous silica and CaF 2 (Si and CaF in amorphous silica 2 F in the solution is added at a molar ratio of 0.5) into the sulfuric acid solution with a concentration of 100g / L, stirred and reacted at a temperature of 40°C for 30min to obtain a reaction slurry.

[0029] 2) Add ammonia water to the reaction slurry after step 1) to adjust the pH of the reaction system to neutral, continue to stir and react for 10 minutes, and obtain filter residue (unreacted amorphous silica, CaF 2 and the resulting SiO 2 and other substances) and ammonium fluoride filtrate with a concentration of 6.73g / L.

[0030] 3) Slowly add the ammonium fluoride filtrate obtained in step 2) into the electrolytic manganese anolyte (Mn ion concentration is 12g / L, Mg ion concentration is 25g / L, (NH 4 ) 2 SO 4 ...

Embodiment 2

[0032] A method of the present invention utilizing fluorine-containing minerals to remove impurity magnesium in the electrolytic manganese system comprises the following steps:

[0033] 1) First add silica gel and fluorite concentrate (Si in silica gel and F in fluorite concentrate are added in a molar ratio of 3) into the sulfuric acid solution with a concentration of 500g / L, stir and react at a reaction temperature of 80°C The reaction was carried out for 300 min to obtain a reaction slurry.

[0034] 2) Add ammonia water to the reaction slurry after step 1) to adjust the pH of the reaction system to neutral, continue to stir and react for 120 minutes, and separate the solid and liquid to obtain the filter residue (unreacted fluorite concentrate, silica gel and generated SiO 2 and other substances) and ammonium fluoride filtrate with a concentration of 14.80g / L.

[0035] 3) Slowly add the ammonium fluoride filtrate obtained in step 2) into the electrolytic manganese anolyte ...

Embodiment 3

[0037] A method of the present invention utilizing fluorine-containing minerals to remove impurity magnesium in the electrolytic manganese system comprises the following steps:

[0038] 1) First add amorphous quartz and fluorite concentrate (Si in quartz and F in fluorite concentrate are added at a molar ratio of 3) into the sulfuric acid solution with a concentration of 300g / L, stir and react at a temperature of React at 60°C for 90 minutes to obtain a reaction slurry.

[0039] 2) Add ammonia water to the reaction slurry after step 1) to adjust the pH of the reaction system to neutral, continue to stir and react for 30 minutes, and separate the solid and liquid to obtain the filter residue (unreacted fluorite concentrate, quartz, and generated SiO 2 and other substances) and ammonium fluoride filtrate with a concentration of 7.40g / L.

[0040] 3) Slowly add the ammonium fluoride filtrate obtained in step 2) into the qualified electrolytic manganese solution (Mn ion concentrat...

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Abstract

The invention discloses a method for removing magnesium impurities in an electrolytic manganese system through fluorine-bearing minerals. The method comprises the steps that firstly, an ammonium fluoride solution is prepared through the fluorine-bearing minerals; secondly, the ammonium fluoride solution is added into electrolytic manganese anolyte or qualified liquid and is subjected to a reaction, and the electrolytic manganese anolyte or the qualified liquid subjected to magnesium fluoride sediment and magnesium removal is obtained after solid-liquid separation, wherein the method for preparing the ammonium fluoride solution through the fluorine-bearing minerals specifically comprises the following steps that 1, an addition agent and the fluorine-bearing minerals are added into a sulfuric acid solution, and the mixture is stirred and subjected to a reaction for a period of time to obtain reaction slurry; 2, the pH of a reaction system is adjusted to be neutral by adding ammonia water into the reaction slurry obtained in the first step, stirring and the reaction are continued for a period of time, solid-liquid separation is conducted, and filter residues and ammonium fluoride filter liquor are obtained. Through the process method, the magnesium impurities in the system are removed without changing the original production process of electrolytic manganese and increasing additional equipment investment, the magnesium removing cost can be greatly lowered, and industrial production can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for removing impurity magnesium in an electrolytic manganese system by using fluorine-containing minerals. Background technique [0002] my country's manganese ore resources are relatively poor, the grade of manganese ore is low, and manganese carbonate ore accounts for a large proportion. Manganese carbonate ore generally contains more impurities such as calcium carbonate and magnesium carbonate. During the leaching process of manganese ore, calcium carbonate and magnesium carbonate will react with sulfuric acid and enter the solution. Calcium ions will form calcium sulfate and enter the slag phase to be discharged, but magnesium will be in the solution. Gradually accumulated in the form of magnesium sulfate, resulting in excessive magnesium content in the solution, causing a large number of disordered crystals in the entire electrolytic manganese product...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/10C25C7/06
CPCC25C1/10C25C7/06Y02P10/20
Inventor 李重洋
Owner CHANGSHA RES INST OF MINING & METALLURGY
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