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High purity manganese sulfate monohydrate and preparation method thereof

A technology of manganese sulfate and manganese sulfate solution, applied in the direction of manganese sulfate, etc., to achieve the effects of simple process, low process cost, process and easy control

Active Publication Date: 2010-11-03
贵州大龙汇成新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to make manganese sulfate meet this requirement by using traditional impurity removal methods, and deep impurity removal must be carried out to produce high-purity manganese sulfate raw materials suitable for power lithium-ion battery cathode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of high-purity manganese sulfate monohydrate of the present invention, it is to adopt following steps to prepare:

[0032] (1) one-step impurity removal: get 500g industrial manganese sulfate solid, record that K content in this industrial manganese sulfate solid by atomic absorption spectrophotometer is 1050ppm, Na content is 1470ppm, Ca content is 1195ppm, Mg content is 2255ppm, Fe Content is 97ppm, Cu content is 37ppm, Pb content is 56ppm, Zn content is 150ppm, add water and be settled to 1600mL to dissolve this industrial manganese sulfate solid, measure the Baume degree of the manganese sulfate solution after the dissolution with Baume meter: 28. Heat and stir to raise the temperature to 85°C, then add 9.6g Fe to the solution 2 (SO 4 ) 3 , adjust the pH value of the solution to 3.5, and filter the solution after stirring for 2 hours (2 hours to 10 hours);

[0033] (2) Two-step impurity removal: add MnCO to the filtered filtrate in the above step (1) 3 , ...

Embodiment 2

[0039] A kind of high-purity manganese sulfate monohydrate of the present invention, it is to adopt following steps to prepare:

[0040] (1) one-step impurity removal: get 1000g industrial manganese sulfate solid, record that the K content in this industrial manganese sulfate solid is 1050ppm, Na content is 1470ppm, Ca content is 1195ppm, Mg content is 2255ppm, Fe content by atomic absorption spectrophotometer Content is 97ppm, Cu content is 37ppm, Pb content is 56ppm, Zn content is 150ppm, add water and be settled to 2400mL to dissolve this industrial manganese sulfate solid, measure the Baume degree of the manganese sulfate solution after the dissolution with Baume meter: 36. Heat and stir to raise the temperature to 100°C, then add 30g Fe to the solution 2 (SO 4 ) 3 , adjust the pH of the solution to be 5, and filter the solution after stirring for 10 h;

[0041] (2) Two-step impurity removal: add MnCO to the filtered filtrate in the above step (1) 3 , adjust the pH val...

Embodiment 3

[0047] A kind of high-purity manganese sulfate monohydrate of the present invention, it is to adopt following steps to prepare:

[0048] (1) one-step impurity removal: get 2000g industrial manganese sulfate solid, record that K content in this industrial manganese sulfate solid by atomic absorption spectrophotometer is 1050ppm, Na content is 1470ppm, Ca content is 1195ppm, Mg content is 2255ppm, Fe Content is 97ppm, Cu content is 37ppm, Pb content is 56ppm, Zn content is 150ppm, add water and be settled to 5555mL to dissolve this industrial manganese sulfate solid, measure the Baume degree of the manganese sulfate solution after the dissolution with Baume meter: 32. Heat and stir to raise the temperature to 90°C, then add 39g Fe to the solution 2 (SO 4 ) 3 , adjust the pH of the solution to be 4, and filter the solution after stirring for 5 h;

[0049] (2) Two-step impurity removal: add MnCO to the filtered filtrate in the above step (1) 3 , adjust the pH value of the solu...

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PUM

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Abstract

The invention relates to manganese sulfate and a preparation method thereof, in particular to high purity manganese sulfate monohydrate and a preparation method thereof. In the high purity manganese sulfate monohydrate, the content of manganese is more than 32%; the content of impurities of K, Na, Ca and Mg are lower than 50ppm; and contents of heavy metal and iron impurity are both lower than 10ppm. The preparation method comprises the steps of: firstly adjusting the pH value of solution to 3.5 to 5 for remove impurities for the first time by using iron sulfate as an impurity removing agent; then adjusting the pH value to 4 to 7 using manganese carbonate; adding an adsorbent to remove the impurities for the second time; removing the impurities for the third time by using manganese fluoride as an impurity removing agent under the condition that the pH value is 4 to 7; then removing the impurities for the fourth time by using barium sulfide as an impurity removing agent under the condition that the pH value is 4 to 7; and finally concentrating, crystallizing, washing and drying to obtain the high purity manganese sulfate monohydrate. In the manganese sulfate monohydrate of the invention, the contents of all main metal impurities are lower; the content of the manganese is high; and the requirement of the anode material of a lithium-ion battery can be satisfied.

Description

technical field [0001] The invention relates to a manganese compound and a preparation method thereof, in particular to a manganese sulfate and a preparation method thereof. Background technique [0002] As a basic manganese salt, manganese sulfate is an important industrial intermediate product for the production of other manganese oxides and manganese salts, and is also widely used in medicine, chemical fertilizers, feed, food, pesticides, papermaking, catalysts and other industries. At present, manganese sulfate in my country is mainly obtained from manganese ore leached by sulfuric acid and then removed. The process of removing impurities is mainly to remove iron and some heavy metal impurities. Although my country's manganese ore resources are relatively rich, with reserves of nearly 700 million tons, the grade of manganese ore is generally low, and most of them are rhodochrosite with a grade of about 20%. As manganese ore is continuously mined, the grade of manganese o...

Claims

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Application Information

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IPC IPC(8): C01G45/10
Inventor 彭天剑申喜元唐素娟陈丽鹃
Owner 贵州大龙汇成新材料有限公司
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