Preparation method of high-purity anhydrous manganese chloride particles

An anhydrous manganese chloride and manganese chloride technology, applied in manganese halide and other directions, can solve the problem of difficult to achieve special chemical products and pharmaceutical production, difficult to prepare high-purity anhydrous manganese chloride particles, and poor dry and wet uniformity. Activity and other issues, to achieve the effect of easy industrial scale production, low cost and low production cost

Inactive Publication Date: 2017-05-17
CENT SOUTH UNIV
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Problems solved by technology

Using the traditional drying process, the drying process consumes a lot of energy, and there are side reactions such as oxidation and hydrolysis, resulting in impurities such as basic manganese chloride and manganese dioxide in the anhydrous manganese chloride product, and it is difficult for the anhydrous manganese chloride product to reach Some special chemical products and pharmaceutical production requirements
(2) Static tray drying method, this method has high labor intensity, the product is loose and easy to pulverize, the material does not flow, the dry and wet uniformity of the product is poor, and over-drying phenomena such as black spots and yellow spots are prone to affect the use activity of the product. The initial moisture is generally above 0.5%
(3) Metal manganese is prepared by reacting with chlorine gas at 700-1000°C. This process has disadvantages such as harsh reaction conditions, difficult reaction control, and complicated post-treatment process.
[0005] Therefore, the existing method is difficult to prepare high-purity anhydrous manganese chloride particles

Method used

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  • Preparation method of high-purity anhydrous manganese chloride particles

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preparation example Construction

[0029] refer to figure 1 , a preparation method of high-purity anhydrous manganese chloride particles, comprising the following steps:

[0030] (1) Grinding the manganese dioxide finely;

[0031] (2) Mixing the finely ground manganese dioxide with hydrochloric acid, stirring and reacting to obtain a manganese chloride solution;

[0032] (3) adding ethylsulfide nitrogen to the manganese chloride solution;

[0033] (4) filtering the solution obtained in step (3) to obtain a filtrate;

[0034] (5) Concentrating and crystallizing the filtrate to obtain crystal slurry;

[0035] (6) centrifuging the crystal slurry to obtain hydrated manganese chloride;

[0036] (7) drying the hydrated manganese chloride to obtain anhydrous manganese chloride;

[0037] (8) Granulating the anhydrous manganese chloride to obtain granular anhydrous manganese chloride;

[0038] (9) Classifying the granular anhydrous manganese chloride to obtain high-purity anhydrous granular manganese chloride with...

Embodiment 1

[0040] Synthetic manganese dioxide is selected as the raw material, and the synthetic manganese dioxide is ground until 90% of it passes through 100 mesh. The finer particle size is finer and easier to react fully. Dilute hydrochloric acid to a concentration of 20% in advance, then mix finely ground synthetic manganese dioxide and diluted hydrochloric acid at a mass ratio of 1:1.6, stir after mixing to react to obtain a manganese chloride solution. Add ethoxynitrogen to the manganese chloride solution, add ethoxynitrogen 0.2 g per liter of the solution, and filter the solution after the reaction is completed to obtain a filtrate. Concentrating and crystallizing the filtrate to obtain a magma; centrifuging the magma to obtain hydrous manganese chloride with a water content of 7%. The hydrated manganese chloride is dried at a temperature of 250° C. to obtain anhydrous manganese chloride. The anhydrous manganese chloride is granulated on a disc pelletizer, and the granulation ti...

Embodiment 2

[0042] Synthetic manganese dioxide is selected as the raw material, and the synthetic manganese dioxide is ground until 90% of it passes through 100 mesh, and the finer particle size is finer and easier to react fully. Dilute hydrochloric acid to a concentration of 20% in advance, then mix finely ground synthetic manganese dioxide and diluted hydrochloric acid at a mass ratio of 1:1.6, stir after mixing to react to obtain a manganese chloride solution. Add ethoxynitrogen to the manganese chloride solution, add ethoxynitrogen 0.3 g per liter of solution, and filter the solution after the reaction is completed to obtain a filtrate. Concentrating and crystallizing the filtrate to obtain a magma; centrifuging the magma to obtain hydrated manganese chloride with a water content of 8%. Dry the hydrated manganese chloride at a temperature of 280° C. to obtain anhydrous manganese chloride. The anhydrous manganese chloride is granulated on a disc pelletizer, and the granulation time i...

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Abstract

The invention relates to a preparation method of high-purity anhydrous manganese chloride particles. Synthetic manganese dioxide is adopted as a raw material, and hydrochloric acid is adopted as a leaching agent to react to obtain a manganese chloride solution; and the solution is subjected to impurity removal-crystallization-drying- granulation-drying to obtain uniform manganese chloride particles of which the particle sizes are 0.5-8mm. The preparation technology is simple, reaction conditions are easy to meet, the reaction is also easy to control, and a post-treatment process is simple. The synthetic manganese dioxide which is high in purity and low in impurity content is adopted as a preferred raw material, and the hydrochloric acid is adopted as a reactant, so that the cost is low. High-purity anhydrous manganese chloride particles with uniform particle sizes can be obtained, a product is good in quality, and the anhydrous manganese chloride product can meet the production requirements of some special chemical products and medicines.

Description

technical field [0001] The invention relates to the field of preparation of manganese series products, in particular to a preparation method of high-purity anhydrous manganese chloride particles. Background technique [0002] Manganese chloride is also known as manganese chloride; manganese dichloride; manganese chloride tetrahydrate and so on. Chemical formula: MnCl 2 , the appearance of hydrated manganese chloride is rose monoclinic crystal; the appearance of anhydrous manganese chloride is pink crystal. It is mainly used in the synthesis of medicines and the manufacture of feed additives, analytical reagents, dyes and pigments; the smelting of magnesium alloys and aluminum alloys, the production of brown and black bricks and tiles, and the manufacture of pharmaceuticals and dry batteries; it can also be used as a trace element fertilizer in agriculture. [0003] The density of anhydrous manganese chloride is 2.977g / cm 3 , melting point 650 ° C, sublimation at temperatu...

Claims

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Application Information

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IPC IPC(8): C01G45/06
CPCC01G45/06C01P2004/60C01P2006/80
Inventor 袁明亮闫冠杰
Owner CENT SOUTH UNIV
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