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Method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite from rotary kiln slag

A technology of rotary kiln and manganese sulfate, which is applied in the field of manganese sulfate, can solve the problems that steel plants are difficult to accept, and achieve the effects of cost saving, high iron content and high purity

Active Publication Date: 2021-05-11
广西埃索凯新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rotary kiln slag mainly contains chemical components such as elemental iron, ferrite, carbon powder, silicon dioxide, silicate, calcium oxide, alumina, magnesia, etc. It belongs to general solid waste. The main treatment methods for rotary kiln slag are: One is to obtain iron concentrate and tailings after crushing, magnetic separation, washing and other processes. The iron concentrate is returned to the ironworks for blast furnace ironmaking or sent to non-ferrous metal smelters for alloy smelting. However, due to the presence of sulfur, phosphorus, etc. Unfavorable elements make it unacceptable for iron and steel plants, so they can only be used in moderation as additives. Tailings are mainly discarded in landfills, and some are used for cement ingredients and roadbed landfills; another method is to use them for wastewater treatment after modification.

Method used

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  • Method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite from rotary kiln slag
  • Method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite from rotary kiln slag
  • Method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite from rotary kiln slag

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Experimental program
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Effect test

Embodiment 1

[0051] The method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite with rotary kiln slag comprises the following steps:

[0052] The main component detection of the pyrolusite involved in the present embodiment is as follows:

[0053] main ingredient MnO 2

Fe SiO 2

C Al 2 o 3

Ca Mg K content(%) 67.41 5.96 9.37 6.18 3.68 0.88 0.49 1.15 chemical composition Na Ni co Cr Pb Cd Zn Cu content(%) 0.84 0.031 0.011 0.018 <0.005

<0.001

0.02 0.0072

[0054] The detection of the main components of the rotary kiln slag involved in this embodiment is as follows:

[0055] main ingredient Fe C SiO 2

Fe 3 o 4

FeO FeS content(%) 43.34 8.10 14.33 4.67 14.11 1.46 main ingredient MgO MnO CaO ZnO K 2 o

Al 2 o 3

content(%) 2.37 1.39 4.21 3.48 0.12 4.76 main ingredient Cu Pb Ni co Cr C...

Embodiment 2

[0071] The method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite with rotary kiln slag comprises the following steps:

[0072] The chemical composition data of the pyrolusite of the present embodiment and the rotary kiln slag are identical with embodiment 1;

[0073] 1) Beating: Mix the pyrolusite and rotary kiln slag that have passed through a 100-mesh sieve at a mass ratio of 1:2 to obtain a mixture, and put the mixture and water into the stirring tank at a solid-to-liquid mass ratio of 1:2 for beating get the slurry;

[0074] 2) add promotor in the slurry that upward step obtains, after stirring evenly, add dropwise the concentrated sulfuric acid that mass content is 98% to carry out reduction leaching reaction, the addition of promotor is 3% of slurry quality, controls the adding speed of vitriol oil so that The reaction pH value is between 0-1.5, the reaction temperature is 70-80°C, the reaction time is 3h, and the leaching slurry is obta...

Embodiment 3

[0088] The method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite with rotary kiln slag comprises the following steps:

[0089] The chemical composition data of the pyrolusite of the present embodiment and the rotary kiln slag are identical with embodiment 1;

[0090] 1) Beating: Mix the pyrolusite and rotary kiln slag that have passed through a 100-mesh sieve at a mass ratio of 1:1 to obtain a mixture, and put the mixture and water into the stirring tank at a solid-to-liquid mass ratio of 1:1 for beating get the slurry;

[0091] 2) add promotor in the slurry that upward step obtains, after stirring evenly, add dropwise the concentrated sulfuric acid that mass content is 98% and carry out reduction leaching reaction, the addition of promotor is 5% of slurry quality, controls the adding speed of vitriol oil so that The reaction pH value is between 0-1.5, the reaction temperature is 90-100°C, the reaction time is 2h, and the leaching slurry is ob...

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Abstract

The invention discloses a method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite from rotary kiln slag, which comprises the following steps of: reacting the rotary kiln slag and the pyrolusite serving as main raw materials under a certain condition, conducting reducing and leaching, adding the rotary kiln slag again to adjust the acidity, and removing impurity heavy metals such as nickel, cobalt, lead, zinc and the like, and conducting heating, crystallizing and other processes to obtain a powdery feed-grade manganese sulfate product and a manganese sulfate product for batteries.

Description

【Technical field】 [0001] The invention relates to the technical field of manganese sulfate, in particular to a method for preparing high-purity manganese sulfate by reducing and leaching pyrolusite with rotary kiln slag. 【Background technique】 [0002] In the current development of science and technology, new energy, smart grid, electric vehicles and other industries will enter a period of explosive growth. As one of the main raw materials for cathode materials lithium manganate and ternary cathode materials, battery-grade manganese sulfate has a broad market demand prospect. The manganese ore raw materials for the production of manganese sulfate mainly include pyrolusite, rhodochrosite, and duromanganese ore. However, due to the increasingly scarce resources of rhodochrosite and duromanganese ore and the lower and lower mineral quality, the dominant position of pyrolusite as raw material will further increase. Consolidation, the common process of producing manganese sulfate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/10
CPCC01G45/10C01P2006/80C01P2004/60Y02P10/20
Inventor 梁余威肖宏赵思思吴文英黄炎善刘伟陈湘胡旺杨文秀许喆
Owner 广西埃索凯新材料科技有限公司
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