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Method for purifying industrial manganese sulfate through cooperation of concentrated sulfuric acid and absolute ethyl alcohol

An anhydrous ethanol, industrial sulfuric acid technology, applied in manganese sulfate and other directions, can solve the problems of high production cost, complex process, environmental pollution, etc., and achieve the effects of less environmental pollution, simple operation, and improved purity

Active Publication Date: 2021-05-25
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional preparation methods of high-purity manganese sulfate mainly include evaporative crystallization method, fluoride precipitation method and extraction method. Among them, evaporative crystallization method needs to carry out evaporative crystallization under the condition of 120-180 ℃, which leads to high energy consumption and high production cost; fluorine The chemical precipitation method needs to add ammonium fluoride, sodium fluoride, barium fluoride, etc. as a precipitant, which will introduce new impurity ions, and the process is relatively complicated; the extraction method needs to use an organic phase (such as Versatic10 and sulfonated kerosene) as the extraction phase , will cause environmental pollution

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  • Method for purifying industrial manganese sulfate through cooperation of concentrated sulfuric acid and absolute ethyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Purify the manganese sulfate solution obtained from the manganese ore leached by the sulfuric acid method in Chongzuo Branch of CITIC Dameng Mining Co., Ltd. The manganese ion content in the manganese sulfate solution is 130g / L, and other ion concentrations are shown in Table 1.

[0036] Other ion concentration in table 1 manganese sulfate solution

[0037]

[0038] The purification method is as follows:

[0039] (1) Add 50 mL of industrial manganese sulfate solution to the beaker, add 6 mL of concentrated sulfuric acid with a concentration of 98 wt% at room temperature at 25 ° C, and stir for 3 hours at a rate of 300 rpm while adding dropwise, precipitate manganese sulfate crystals, and leave it at room temperature Filter after 24 hours;

[0040](2) add deionized water to gained manganese sulfate crystal, be mixed with saturated manganese sulfate solution;

[0041] (3) adding 6mL concentration to the saturated manganese sulfate solution is the concentrated sulfuri...

Embodiment 2

[0045] The industrial manganese sulfate solution that element content is as shown in table 1 is purified, and method is as follows:

[0046] (1) Add 50 mL of industrial manganese sulfate solution into a beaker, add 9 mL of concentrated sulfuric acid with a concentration of 98 wt% at room temperature at 25 ° C, and stir for 0.5 h at a rate of 200 rpm while adding dropwise, manganese sulfate crystals are precipitated, and left to stand at room temperature Filter after 12 hours;

[0047] (2) add deionized water to gained manganese sulfate crystal, be mixed with saturated manganese sulfate solution;

[0048] (3) adding 9mL concentration to the saturated manganese sulfate solution is the concentrated sulfuric acid of 98wt%, repeat steps (1) and (2) 3 times, obtain the manganese sulfate crystal of multiple crystallization;

[0049] (4) Add 18 mL of absolute ethanol to the multi-crystallized manganese sulfate crystals, stir and wash twice, filter, and dry the obtained solid in an ov...

Embodiment 3

[0052] The industrial manganese sulfate solution that element content is as shown in table 1 is purified, and method is as follows:

[0053] (1) Add 50 mL of industrial manganese sulfate solution into a beaker, add 15 mL of concentrated sulfuric acid with a concentration of 98 wt% at room temperature at 25° C., and stir for 0.2 h at a speed of 800 rpm while adding dropwise, manganese sulfate crystals are precipitated, and left to stand at room temperature filter after 1 hour;

[0054] (2) add deionized water to gained manganese sulfate crystal, be mixed with saturated manganese sulfate solution;

[0055] (3) adding 15mL concentration to the saturated manganese sulfate solution is the concentrated sulfuric acid of 98wt%, repeat steps (1) and (2) 4 times, obtain the manganese sulfate crystal of multiple crystallization;

[0056] (4) Add 20 mL of absolute ethanol to the multi-crystallized manganese sulfate crystals, stir and wash twice, filter, and dry the obtained solid in an o...

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Abstract

The invention provides a method for purifying industrial manganese sulfate through cooperation of concentrated sulfuric acid and absolute ethyl alcohol, belonging to the technical field of manganese sulfate purification. According to the method, concentrated sulfuric acid and an industrial manganese sulfate solution are stirred and mixed at normal temperature, and manganese sulfate crystals are separated out by utilizing the same ion effect generated by excessive sulfate radicals, so calcium ions and magnesium ions in the industrial manganese sulfate solution are preliminarily separated; and a saturated manganese sulfate solution is prepared from the manganese sulfate crystals, and the saturated manganese sulfate solution and excessive concentrated sulfuric acid are recrystallized, so calcium and magnesium ions in the manganese sulfate solution can be further separated, and the purity of the manganese sulfate crystals is improved. According to the method, absolute ethyl alcohol is adopted for washing, the absolute ethyl alcohol has a separation effect on calcium and magnesium ions in the manganese sulfate crystals, and meanwhile, the phenomenon that the crystals are too high in viscosity and difficult to dry due to the fact that concentrated sulfuric acid is excessively used can be relieved. Meanwhile, the method is simple, low in cost and free of environmental pollution.

Description

technical field [0001] The invention relates to the technical field of manganese sulfate purification, in particular to a method for purifying industrial manganese sulfate with concentrated sulfuric acid and absolute ethanol. Background technique [0002] With the continuous development of new energy vehicles, new energy vehicles have gradually become an important force leading the transformation of the world's automobile industry. The positive electrode material of power battery is a major bottleneck restricting the development of new energy vehicles. At present, the positive electrode materials of power batteries mainly include lithium manganese oxide, lithium iron phosphate, and ternary positive electrode materials with nickel salt, cobalt salt, and manganese salt as raw materials. Manganese sulfate is one of the raw materials of ternary cathode materials, and its purity directly affects the performance of power batteries. [0003] High-purity manganese sulfate is mainl...

Claims

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Application Information

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IPC IPC(8): C01G45/10
CPCC01G45/10C01P2006/80
Inventor 王开拓陈厚杨韦悦周明宪权詹锋
Owner GUANGXI UNIV
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