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High-purity manganese metal and preparation method thereof

A manganese metal, purity technology, applied in the direction of improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of inability to wash and recycle slag, high consumption of sulfuric acid, low resource utilization rate, etc., to improve the utilization rate of manganese resources, improve the overall Manganese recovery rate and production cost reduction effect

Inactive Publication Date: 2014-12-17
GUIZHOU REDSTAR DEVING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the large consumption of sulfuric acid in the existing manganese metal production process, the slag cannot be washed and recovered, the slag contains a large amount of manganese sulfate and ammonium sulfate, the resource utilization rate is low and the environment is polluted, and the obtained manganese metal To solve the problem of high impurity content in the product, a manganese metal with a purity of more than 99.99wt% and its preparation method are provided. The vulcanization process is used to separate impurity ions such as calcium and magnesium, thereby ensuring that the purity of the manganese metal product reaches more than 99.99wt%; In addition, through the vulcanization process, the water balance problem of the existing manganese metal process that consumes a large amount of sulfuric acid is solved, so that the vulcanization reaction filter cake can be effectively washed, the utilization rate of manganese resources is improved, and environmental pollution is reduced.

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preparation example Construction

[0034] The present invention provides a method for preparing metal manganese with a purity of 99.99wt% or more. The method includes: a first step, mixing manganese sulfate solution with a concentration of 100-350g / L, preferably 250-300g / L, and NH 3 Gas and H 2 S gas carries out vulcanization reaction, and the pH value of the reaction solution during the vulcanization reaction is controlled within the range of 5.5-6.5 (preferably 5.71-6.24); in the second step, [Mn 2+ ] <200ppm, stop the vulcanization reaction, and then separate the solid and liquid to obtain the filter cake; the third step is to wash the filter cake, acidify the solution with sulfuric acid, and separate the solid and liquid to obtain the filtrate; the fourth step is to obtain the filtrate The filtrate is electrolyzed to obtain metal manganese.

[0035] The invention provides manganese metal with a purity of more than 99.99wt%. The content of Ca in the manganese metal is less than or equal to 0.0013%, and the ...

Embodiment 1

[0044] The flue gas uses industrial-grade barium carbonate carbon to reduce the exhaust gas of the rotary kiln, with an average gas volume of 25000Nm 3 / h, average SO 2 Content 13400mg / m 3 , The outlet temperature of the cyclone dust collector is about 170°C. Medium and low grade MnO 2 Mineral powder (15% by weight containing Mn) is beaten with the filtrate after washing with sulfurized reactants to obtain slurry, and then passed through sulfur-containing flue gas for reaction to generate manganese sulfate solution, and then adjust its concentration to 250g / L.

[0045] Add the manganese sulfate solution with a concentration of 250g / L into the third stage of the three-stage vulcanization device. Introduce NH in the first stage of the three-stage vulcanization unit 3 Gas and H 2 Mixed gas of S gas, NH 3 Gas and H 2 The molar ratio of S gas is 2:1. The gas velocity of the mixed gas in each stage of vulcanization device is controlled at 2m / sec, and the average flow rate ...

Embodiment 2

[0051] The flue gas uses industrial-grade barium carbonate carbon to reduce the exhaust gas of the rotary kiln, with an average gas volume of 25000Nm 3 / h, average SO 2 Content 13400mg / m 3 , The outlet temperature of the cyclone dust collector is about 170°C. Medium and low grade MnO 2 Mineral powder (containing Mn is 20% (by weight)) is beaten with the filtrate after washing with sulfurized reactants to obtain slurry, and then passed through sulfur-containing flue gas for reaction to generate manganese sulfate solution, and then adjust its concentration to 300g / L.

[0052] Add the manganese sulfate solution with a concentration of 300g / L into the third stage of the three-stage vulcanization device. Introduce NH in the first stage of the three-stage vulcanization unit 3 Gas and H 2 Mixed gas of S gas, NH 3 Gas and H 2 The molar ratio of S gas is 2:1. The gas velocity of the mixed gas in each stage of vulcanization device is controlled at 2m / sec, and the average flow ...

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Abstract

The invention relates to a high-purity manganese metal and a preparation method. The preparation method comprises the following steps of: firstly, carrying out a vulcanization reaction of a manganese sulfate solution with the concentration of 100-350g / L with NH3 gas and H2S gas, wherein the pH value of a reaction solution in the vulcanization reaction is 5.5-6.5; secondly, stopping the vulcanization reaction when Mn<2+> in the reaction solution when is smaller than 200ppm,and separating solid from liquid to obtain a filter cake; thirdly, washing the filter cake, acidifying with a sulfuric acid containing solution and carrying out solid-liquid separation to obtain filtrate; and fourthly, electrolyzing the filtrate to obtain manganese metal. According to the invention, foreign ions such as calcium and magnesium are separated in a vulcanization manner so that the purity of the manganese metal product is higher than 99.99wt%.

Description

technical field [0001] The invention relates to a high-purity manganese metal and a preparation method thereof, in particular to a method for preparing high-purity manganese metal by electrolyzing a manganese sulfate solution. Background technique [0002] At present, the domestic annual output of manganese metal has reached more than one million tons, and most of them adopt the process route of manganese carbonate-acid leaching-impurity removal-electrolysis. In recent years, the grade of manganese carbonate ore has decreased year by year, and the ore powder contains a large amount of calcium and magnesium impurities, resulting in a large consumption of sulfuric acid. At the same time, due to the restriction of the water balance of the system, the slag cannot be washed and recovered. In some areas, the consumption per ton of metal manganese ore has reached 12 tons. pollute. The reduction of the mineral powder leaching rate, coupled with the consumption of materials in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/10C22B1/00
CPCY02P10/20
Inventor 姜志光华东
Owner GUIZHOU REDSTAR DEVING
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