Direct production of electron grade high purity trimangnese tetraoxide from ores

A technology of trimanganese tetroxide and manganese oxide, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems that the manganese sulfate solution method does not give a specific technical plan, does not make specific requirements for raw materials, and the process is not perfect, etc., to achieve improvement Resource utilization rate, low production cost and good product quality

Inactive Publication Date: 2005-07-27
UNIV OF SCI & TECH BEIJING
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  • Summary
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Problems solved by technology

Chinese patent CN1295978 patent provides a kind of using pyrolusite or manganese sulfate as raw material to adopt the method for flocculating and filtering with organic polymer flocculant to directly produce manganese tetraoxide with large specific surface area, and the manganese content of the product is 70~71%, but in The process of preparing manganese tetraoxide from pyrolusite raw materials is not perfect. Firstly, there are no specific requirements for the raw materials of pyrolusite. Secondly, no specific technical scheme is given on the method of preparing manganese sulfate solution. The process of trimanganese oxide is not supported by the examples
The article published on pages 22-24 of China Manganese Industry Volume 18, Issue 3, uses primary manganese ore to produce high-purity manganese tetraoxide, uses manganese sulfate-manganese carbonate mixed ore, and leaches with sulfuric acid at a temperature of 80°C. Precipitate manganese hydroxide, filter, oxidize and dry to prepare high-purity trimanganese tetraoxide, but the specific surface area is small, and its value is 11.71m 2 / g

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Low-grade manganese-silver ore, containing 28% manganese, manganese minerals are mainly pyrolusite, followed by duromanganese ore, ferromanganese and so on. Silver exists in the manganese mineral crystal lattice in the form of isomorphism. In this embodiment, only metal manganese minerals are recovered, and the silver enters the slag for additional treatment after leaching manganese. Grinding fineness: -200 mesh 90%, normal temperature and pressure, liquid-solid ratio 4:1, leaching time 4h, SO 2 The weight percent concentration is 5%, and the manganese sulfate solution is obtained by filtration. The manganese leaching rate is 98%. Be that 25% ammoniacal liquor regulates pH=4.5 of manganese sulfate solution with weight percent concentration, removes iron by filtration; Add (NH 4 ) 2 S saturated solution removes heavy metal ions, the temperature is 60°C; (NH 4 ) 2 The molar concentration of S is 0.1M; add NF 4 F except magnesium and calcium, NF 4 The weight percen...

Embodiment 2

[0020] Low-grade manganese ore, containing 18% manganese, manganese minerals are mainly pyrolusite. Grinding fineness: -200 mesh 85%, normal temperature and pressure, liquid-solid ratio 4:1, leaching time 3.5h, SO 2 The weight percent concentration is 5%, and the manganese sulfate solution is obtained by filtration. The manganese leaching rate is 96%. Be that 20% ammoniacal liquor regulates pH=4~6 of manganese sulfate solution with weight percent concentration, removes iron by filtration; Add (NH 4 ) 2 S saturated solution removes heavy metal ions, the temperature is 60°C; (NH 4 ) 2 The molar concentration of S is 0.1M; add NF 4 F except magnesium and calcium, NF 4 The weight percent concentration of F is 1%, and the impurity precipitate is filtered to obtain a purified manganese sulfate solution. Pass the obtained purified manganese sulfate solution into ammonia water with a concentration of 20% by weight, adjust pH=10, keep the solution temperature at 70°C, pass throu...

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PUM

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Abstract

Production of electronic high purity manganic manganous oxide by manganese oxide ore is characterized by taking manganese oxide ore as materials, immersing manganese from manganese oxide ore under ordinary pressure and temperature by sulfur dioxide, removing iron, copper, nickel, lead heavy metal ion in manganese sulfate mother liquid, obtaining purified manganese sulfate solution, coordinating the ammonia water and ammonium acid carbonate, depositing manganese, obtaining hydrated manganic hydroxide and manganese carbonate mixture, high temperature roasting the mixture, cooling washing for 3-5 times, drying to obtain manganic manganous oxide or inducing directly the purified manganese sulfate solution into ammonia water, regulating pH value 8-10 with solution temperature 50-70deg.C, inducing the dried air or oxygen for 6-9hrs, washing 3-5 times, filtering, drying to obtain manganic manganous oxide . It achieves low cost, high utilizing rate and product purity.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, in particular to a method for directly producing electronic-grade high-purity manganese tetraoxide by using manganese oxide ore. Background technique [0002] High-purity trimanganese tetroxide is the main raw material for the production of high-quality soft ferrite. The soft ferrite made of it has a narrow remanence induction curve and can be magnetized repeatedly; at the same time, its high DC resistivity can avoid more eddy current losses Therefore, it is widely used in industries such as electronics, electrical appliances, and electric power. The preparation methods of trimanganese tetraoxide include roasting method, reduction method, oxidation method and electrolysis method. At present, domestic industrial production of manganese tetroxide mainly adopts metal manganese powder suspension oxidation method, which requires electrolytic manganese as raw material, high cost, high i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 卢惠民
Owner UNIV OF SCI & TECH BEIJING
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