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Method for preparing electrolytic manganese by using pyrolusite

A technology of pyrolusite and electrolytic manganese, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of large iron-containing waste residue, high energy consumption of electrolysis, and high sulfur content of electrolytic manganese, and achieve long residence time and high reaction rate. The effect of simple device, accelerated absorption and reaction rate

Pending Publication Date: 2019-10-15
贵州合众锰业科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for preparing electrolytic manganese by using pyrolusite, which can effectively solve the problem of dithionite generated in the pyrolusite sulfur dioxide leaching method, which leads to high energy consumption for electrolysis and low electrolytic manganese production. High sulfur content and the problem of producing a large amount of iron-containing waste residue in the pyrolusite ferrous sulfate leaching method

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  • Method for preparing electrolytic manganese by using pyrolusite

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Embodiment 1

[0035] A method of utilizing pyrolusite to prepare electrolytic manganese, comprising the following steps:

[0036] (1) manganese ore leaching: the manganese content is 20% pyrolusite pulverization, and the particle size is 40 order pyrolusite particles, 112kg pyrolusite particles and 1000L are mixed with the mixed solution containing ammonium sulfate, manganese sulfate and ferrous sulfate to obtain slurry, and then reacted for 0.5h under stirring conditions to leach the manganese in the pyrolusite; wherein, the Mn in the mixed solution 2+ The mass concentration of ammonium sulfate is 15g / L, the mass concentration of ammonium sulfate is 110g / L, and the molar concentration of ferrous sulfate is 1.0mol / L; the mol ratio of manganese element and ferrous sulfate in pyrolusite is 0.4:1;

[0037] (2) Neutralize heavy iron: under stirring conditions, add calcium hydroxide to the slurry obtained in step (1), adjust the pH value to 5.0, and then feed oxygen to make Fe in the solution 2...

Embodiment 2

[0042] A method of utilizing pyrolusite to prepare electrolytic manganese, comprising the following steps:

[0043] (1) Manganese ore leaching: the manganese content is 17% pyrolusite pulverization, and the particle size is 200 mesh pyrolusite particles, 187.5kg pyrolusite particles and 1500L containing ammonium sulfate, manganese sulfate and ferrous sulfate mixed solution mix slurry, Obtain slurry, then under stirring condition, react 5h, the manganese in leaching pyrolusite; Wherein, the mass concentration of manganese in the mixed solution is 25g / L, the mass concentration of ammonium sulfate is 130g / L, the amount of substance of ferrous sulfate The concentration is 0.86mol / L; the molar ratio of manganese to ferrous sulfate in pyrolusite is 0.45:1;

[0044] (2) Neutralize heavy iron: under stirring conditions, add calcium hydroxide to the slurry obtained in step (1), adjust the pH value to 7.0, then add hydrogen peroxide, so that Fe in the solution 2+ Concentration is 0.9mg...

Embodiment 3

[0049] A method of utilizing pyrolusite to prepare electrolytic manganese, comprising the following steps:

[0050] (1) manganese ore leaching: the manganese content is the pulverization of 23% pyrolusite, and the particle size is 60 order pyrolusite particles, and 500kg pyrolusite particles and 5000L are mixed with the mixed solution containing ammonium sulfate, manganese sulfate and ferrous sulfate to obtain Slurry, then under stirring condition, react 2.5h, the manganese in leaching pyrolusite; Wherein, the mass concentration of manganese in the mixed solution is 20g / L, the mass concentration of ammonium sulfate is 120g / L, the amount of the substance of ferrous sulfate The concentration is 1.2mol / L; the molar ratio of manganese to ferrous sulfate in pyrolusite is 0.35:1;

[0051] (2) Neutralize heavy iron: under stirring conditions, add calcium hydroxide to the slurry obtained in step (1), adjust the pH value to 6.0, and then feed oxygen to make Fe in the solution 2+ Conce...

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Abstract

The invention discloses a method for preparing electrolytic manganese by using pyrolusite, and the method comprises the following steps of leaching manganese ore: crushing pyrolusite, mixing a mixed solution containing ammonium sulfate, manganese sulfate and ferrous sulfate with pyrolusite particles to obtain slurry, and leaching; neutralizing and precipitating iron: adding calcium-based neutralizer into the slurry, adjusting pH value, adding oxidant to enable Fe<2+> concentration in the solution to be lower than 1 mg / L, and filtering to obtain manganese sulfate solution and iron hydroxide filter residue; carrying out heavy metal removal: adding a vulcanizing agent into the manganese sulfate solution to enable the concentration of heavy metal ions in the solution to be lower than 1 mg / L, and then filtering to obtain vulcanized slag and electrolyte; and carrying out electrolytic recovery of manganese metal: electrolyzing the obtained electrolyte to prepare electrolytic manganese and electrolytic manganese anolyte containing sulfuric acid. The method can effectively solve the problem that dithionate is generated in the pyrolusite sulfur dioxide leaching method, thereby causing the problems of high electrolysis energy consumption, high sulfur content of electrolytic manganese and large amount of iron-containing waste residue generated in the pyrolusite ferrous sulfate leaching method.

Description

technical field [0001] The invention relates to the technical field of preparation of manganese sulfate electrolyte, in particular to a method for preparing electrolytic manganese from pyrolusite. Background technique [0002] Due to its high purity and less impurities, electrolytic manganese is an important alloying element in the production of stainless steel, high-strength low-alloy steel, aluminum-manganese alloy, copper-manganese alloy, etc. It is an indispensable raw material in the production of manganese salt, and has a very important strategic position in the national economy and social development. [0003] Using manganese ore as raw material, leaching, purification and electrolysis are common steps in the production of electrolytic manganese. Manganese carbonate (MnCO 3 ) and pyrolusite (MnO 2 ) are the two main types of manganese ores that exist in nature. However, the manganese carbonate ore-sulfuric acid leaching electrolyte production process has been used...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C22B47/00C25C1/10
CPCC22B3/08C22B3/44C22B47/00C25C1/10Y02P10/20
Inventor 刘星朱学成高利宇善臣
Owner 贵州合众锰业科技有限公司