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Method for preparing trimanganese tetroxide by using rhodochrosite

A technology of trimanganese tetroxide and rhodochrosite, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of high impurity content, low quality, chemical impurity removal and incomplete purification, etc., so as to improve product quality and reduce production cost , The effect of eliminating the electrolysis process

Active Publication Date: 2011-07-27
CHANGSHA RES INST OF MINING & METALLURGY
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  • Claims
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Problems solved by technology

[0005] In general, the existing raw manganese ore or manganese sulfate is the method for preparing trimanganese tetraoxide as a raw material, the chemical removal and purification of its raw materials are not thorough, and the impurity content is relatively high in the trimanganese tetraoxide finished product that is finally obtained ( Compared with the trimanganese tetroxide produced by electrolysis), the quality is also lower, which is a major factor that affects the existing method for preparing trimanganese tetraoxide as raw material with primary manganese ore or manganese sulfate and cannot be applied in a large scale

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  • Method for preparing trimanganese tetroxide by using rhodochrosite

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Embodiment

[0031] a kind of like figure 1 In the shown method for preparing trimanganese tetroxide from rhodochrosite, the manganese content of the rhodochrosite ore is 15.14%, and the grinding fineness is: -100 mesh 100%. The preparation method specifically includes the following steps.

[0032] 1. Acid leaching: select sulfuric acid solution to leach the above-mentioned rhodochrosite at normal temperature and pressure, in the acid leaching process, the mass ratio (i.e. acid ore ratio) of sulfuric acid and this rhodochrosite is 0.6: 1, and the sulfuric acid solution used and the rhodochrosite The mass ratio of manganese ore (ie liquid-solid ratio) is 4:1, the acid leaching time is 30min, and manganese sulfate solution is obtained after filtration. The leaching of rhodochrosite with sulfuric acid can be carried out at room temperature, the reaction time is short, the leaching rate of manganese can reach over 99% when leaching for 30 minutes, and the recovery rate of manganese leaching ca...

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Abstract

The invention discloses a method for preparing trimanganese tetroxide by using rhodochrosite, comprising the following steps of: lixiviating the rhodochrosite by using a sulfuric acid solution to prepare a manganese sulfate solution; then purifying the manganese sulfate solution; then adding ammonia water to the purified manganese sulfate solution so that divalent manganese ions contained in the manganese sulfate solution generate manganese hydroxide precipitates; desulphurizing and washing the manganese hydroxide precipitates, and then oxidizing the washed manganese hydroxide precipitates by utilizing air or oxygen; and finally washing and drying to obtain a trimanganese tetroxide finished product. The preparation method not only has a simple process and low cost, but also has high purity and recovery rate and large specific surface area of a prepared product.

Description

technical field [0001] The invention relates to a preparation method of manganese oxide, in particular to a preparation method of trimanganese tetraoxide. Background technique [0002] High-purity manganese tetraoxide is one of the important raw materials for the production of manganese-zinc-oxygen soft magnetic materials in the electronics industry. With the implementation of the national "green lighting" project, the rapid development of televisions, mobile communications, computers and energy-saving lamps, the demand for soft ferrites has grown rapidly, which has led to a rapid increase in the demand for manganese tetraoxide. The development and production of manganese tetraoxide has a broad market prospect. [0003] The existing preparation methods of trimanganese tetroxide mainly include electrolysis method, oxidation-reduction method using primary manganese ore or manganese sulfate as raw materials. At present, the production of trimanganese tetroxide mostly adopts t...

Claims

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Application Information

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IPC IPC(8): C01G45/02
Inventor 李先柏陈一波许彬段兴无习小明
Owner CHANGSHA RES INST OF MINING & METALLURGY
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