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Preparation method and application of manganese hydroxide

A manganese hydroxide and metal manganese technology, applied in manganese oxide/manganese hydroxide, chemical instruments and methods, manganese compounds, etc., can solve the problems of high environmental protection treatment cost, increase in production cost, increase in equipment investment, etc., and reduce energy consumption. consumption, improve safety, and reduce pollution

Active Publication Date: 2022-03-25
GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Moreover, the production process of the above manganese-based functional materials involves high environmental protection treatment costs
When ammonia catalyst is used, ammonia nitrogen treatment is required, ammonium sulfate and ammonium chloride by-products in the process need to be recycled, and a large amount of rinsing wastewater needs to be purified, which will also lead to an increase in equipment investment and production costs.

Method used

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  • Preparation method and application of manganese hydroxide
  • Preparation method and application of manganese hydroxide
  • Preparation method and application of manganese hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A preparation method for manganese hydroxide, comprising the following steps:

[0050] Squeeze and pulverize the electrolytic manganese metal sheet with a pair of rollers, and pass through a 150 mesh sieve to obtain -150 mesh manganese metal coarse powder;

[0051] Get 200g metal manganese coarse powder, according to the ratio of the solid-liquid ratio of metal manganese coarse powder and water 1:8, metal manganese coarse powder and water are placed in the stainless steel pressure reaction kettle of 1L volume 316L material airtight barrier oxygen, stir After the temperature rises to 150°C, the temperature rise is stopped, and the temperature and pressure in the kettle are adjusted to the set reaction temperature and pressure range through the self-exothermic reaction of the metal manganese coarse powder and water and the self-generated hydrogen, and then the temperature and pressure in the kettle Constantly rising, when the pressure in the kettle reaches 3.0MPa (gauge p...

Embodiment 2

[0053] A preparation method for manganese hydroxide, comprising the following steps:

[0054] Squeeze and crush the electrolytic manganese metal flakes with a pair of rollers, pass through a 100-mesh sieve, and obtain -100-mesh manganese metal coarse powder;

[0055] Get 2000g of manganese metal powder, put the metal manganese coarse powder and water in a 316L stainless steel pressure reactor with a volume of 10L in a closed oxygen barrier according to the solid-to-liquid ratio of the metal manganese coarse powder and water, and stir After the temperature rises to 180°C, the temperature rise is stopped, and the temperature and pressure in the kettle are adjusted to the set reaction temperature and pressure range through the self-exothermic reaction of the metal manganese coarse powder and water and the self-generated hydrogen, and then the temperature and pressure in the kettle Constantly rising, when the pressure in the kettle reaches 3.5MPa (gauge pressure), open the exhaust...

Embodiment 3

[0057] A preparation method of high-purity trimanganese tetraoxide, comprising the following steps:

[0058] The manganese hydroxide slurry prepared in Example 1 was oxidized at normal temperature and pressure under stirring conditions with enough air until the pH of the mother liquor was lower than 7.5 and then continued to oxidize for half an hour, then suction filtered, and the filter cake was Dry at 120° C. for 24 hours to obtain high-purity manganese tetraoxide, and the waste water after suction filtration can be directly returned to prepare the aforementioned manganese hydroxide slurry. After testing, the particle size D50 of the prepared high-purity manganese tetraoxide is 8.1 μm, and the specific surface area is 8.4m 2 / g, the manganese content is 71.5%, the iron content is 0.0028%, the sulfate radical content is 0.062%, and the chloride ion content is 0.0064%.

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Abstract

The invention discloses a preparation method of manganese hydroxide, which comprises the following steps: placing metal manganese coarse powder and water in a pressure reaction kettle according to a set solid-to-liquid ratio, raising the temperature in the kettle to 120 DEG C or above under the conditions of sealing, oxygen isolation and stirring, controlling the pressure in the kettle to 0.2 MPa or above, and fully and completely reacting to obtain manganese hydroxide slurry. And introducing air or oxygen into the manganese hydroxide slurry at normal temperature and normal pressure for oxidation, and after the reaction is completed, carrying out solid-liquid separation and drying to obtain the high-purity manganous-manganic oxide. High-purity manganous-manganic oxide is subjected to a reduction reaction in an atmosphere furnace at a high temperature, and high-purity manganous-manganic oxide can be obtained. And introducing carbon dioxide into the manganese hydroxide slurry, stirring and reacting completely under the reaction pressure of not more than 1.0 MPa, and then carrying out solid-liquid separation and drying to obtain the high-purity manganese carbonate. The high-purity manganese carbonate is subjected to high-temperature roasting, and high-purity manganese monoxide can be obtained. The purity advantage of the electrolytic manganese metal product is kept, energy consumption can be reduced, safe and clean production is achieved, and the environmental protection problem is avoided.

Description

technical field [0001] The invention belongs to the technical field of manganese series materials and their preparation and application, and specifically relates to the generation of manganese hydroxide products and various downstream applications thereof. Background technique [0002] Electrolytic manganese metal is a product prepared by using manganese ore as raw material through crushing, leaching, impurity removal and electrolysis. ≤0.01%, sulfate radical ≤0.1%, chloride ion ≤0.01%. As of the end of 2020, the annual production capacity of electrolytic manganese metal in my country is about 1.5 million tons, of which about 90% are used in the iron and steel metallurgy industry, and about 10% are used in batteries, electronics, specialty chemicals and other industries, mainly for the magnetic material trioxide Manganese, manganese sulfate for batteries, manganese tetraoxide for batteries, high-purity manganese carbonate, high-purity manganese monoxide and other manganese-b...

Claims

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Application Information

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IPC IPC(8): C01G45/02C01G45/00
CPCC01G45/02C01G45/00C01P2004/61C01P2006/80
Inventor 刘务华管晓东李达飞谌红玉黄亚君易鑫
Owner GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD