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High-purity trimanganese tetroxide and preparation method of same

A high-purity technology of trimanganese tetraoxide, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of removal, unexplained, incomplete absorption, etc., and achieve the goal of improving specific surface area, avoiding secondary pollution, and reducing decomposition temperature Effect

Active Publication Date: 2012-08-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Problems in this method: (1) how to remove impurities such as iron, aluminum, potassium and sodium from the manganese ore leach solution
(2) The calcination atmosphere (vacuum, non-vacuum, nitrogen protection, etc.) is not specified, and the gas generated by calcination is considered to be a mixed gas of sulfur dioxide and sulfur trioxide, which is absorbed by a mixed slurry composed of pyrolusite, manganese carbonate and water. In the context of the depletion of manganese carbonate resources, the practical value is not great, and the wet absorption of sulfur trioxide gas is easy to produce acid mist, resulting in incomplete absorption and secondary pollution problems
(3) The product standard of trimanganese tetroxide is not specified

Method used

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  • High-purity trimanganese tetroxide and preparation method of same
  • High-purity trimanganese tetroxide and preparation method of same

Examples

Experimental program
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Effect test

Embodiment 1

[0028]Add high-purity manganese sulfate meeting quality standards into acetone with 2% by weight as an organic activator, and then mix and activate in a ball mill for 3 hours. Send the mechanically activated raw materials into the calcination equipment, control the temperature at 900°C, and calcine in the air atmosphere for 3 hours. The amount of air introduced is based on the volume concentration of the sulfur dioxide gas that can be produced by the pyrolysis of manganese sulfate mixed with the introduced gas. 15% (V / V) is controlled to generate qualified manganese tetraoxide powder, and simultaneously the sulfur dioxide gas generated by calcination is drawn out and the Chinese patent 200510021926. 200910058061.2 A reactor suitable for leaching pyrolusite with sulfur dioxide gas, 200910058062.7 A method for preparing manganese sulfate solution by leaching pyrolusite with sulfur dioxide gas, 200910060313.5 Inhibiting dithionic acid in the process of leaching pyrolusite with sul...

Embodiment 2

[0030] Add high-purity manganese sulfate meeting the quality standard into glycerol with a mass of 4% as an organic activator, and then mix and activate in a mixer for 4 hours. Send the mechanically activated raw materials to the calcination equipment, control the temperature at 950°C, and calcine for 3.5 hours under a nitrogen atmosphere. The volume concentration is 10% (V / V) to control to generate qualified manganese tetraoxide powder, and simultaneously lead out the sulfur dioxide gas generated by calcination and use Chinese patent 200510021926. Method for desulfurizing exhaust gas with pH buffer as composite absorbent, 200910058061.2 Reactor suitable for leaching pyrolusite with sulfur dioxide gas, 200910058062.7 Method for preparing manganese sulfate solution by leaching pyrolusite with sulfur dioxide gas, 200910060313.5 Inhibiting continuous pyrolusite during leaching of pyrolusite with sulfur dioxide gas The method for manganese disulfate generation is to absorb and gen...

Embodiment 3

[0032] Add high-purity manganese sulfate meeting the quality standard into its mass percent acetaldehyde as an organic activator, and then seal and mix in a ball mill for activation for 2.5 hours. Send the mechanically activated raw materials into the calcination equipment, control the temperature at 1000°C, and calcine for 3.5 hours in an atmosphere of air and nitrogen mixed gas. The volume concentration after the mixed gas is controlled by 5% (V / V), and the manganese manganese tetraoxide powder that meets the requirements is generated, and the sulfur dioxide gas generated by calcination is simultaneously drawn out and the Chinese patent that the patent applicant of the present invention has been authorized is adopted. 200510021926.X Method for waste gas desulfurization using pyrolusite and pH buffer as composite absorbent, 200910058061.2 Reactor suitable for leaching pyrolusite with sulfur dioxide gas, 200910058062.7 Method for preparing manganese sulfate solution by leaching...

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Abstract

The invention discloses high-purity trimanganese tetroxide and a preparation method of the same. The high-purity trimanganese tetroxide is spherical, has mass content of manganese being greater than or equal to 71%, apparent density being smaller than or equal to 1.5g / m<3>, specific surface area being smaller than or equal to 1.0m<2> / g, mass contents of potassium, sodium, calcium and magnesium being respectively smaller than or equal to 50ppm, mass content of lead being smaller than or equal to 10ppm, mass content of sulphate being smaller than or equal to 200ppm by taking SO4 as reference, and residue on a test sieve of 45 mu m being smaller than or equal to 25%. The preparation method comprises the steps of adding high-purity manganese sulfate in organic activator for mechanical activation; after mechanical activation, conducting calcination under air or nitrogen atmosphere; allowing sulfur dioxide gas produced in calcination to be subjected to absorption leaching by a compound absorbent prepared from pyrolusite; preparing a high-purity manganese sulfate solution by a purification method of conducting induction in manganese sulfate solution to generate hydroxyl free radical.OH; and heating the high-purity manganese sulfate solution by high-temperature calcining tail gas, concentrating and crystallizing to obtain high-purity manganese sulfate returning-recycling as required.

Description

Technical field: [0001] The invention relates to the technical field of raw materials for producing soft ferrite, in particular to a high-purity trimanganese tetraoxide and a preparation method thereof. Background technique: [0002] High-purity trimanganese tetroxide is mainly used in the electronics industry. It is an important raw material for the production of soft ferrite. It can be used as magnetic cores, disks and tapes for storing information in electronic computers, transformers for telephones and high-quality inductors, and return transformers for TVs. , Magnetic recording heads, inductors, magnetic amplifiers, saturated inductors, antenna rods. In addition, it can also be used as a pigment for some paints or coatings. Paints or coatings containing high-purity manganese tetraoxide are better in corrosion resistance than those containing titanium dioxide or iron oxide when sprayed on steel. High-purity manganese manganese tetroxide technology is a new technology ju...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 苏仕军丁桑岚
Owner SICHUAN UNIV
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