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A method for synergistic reduction of pyrolusite by low-carbon organic matter

A technology for organic matter and pyrolusite, applied in the field of pyrolusite reduction, can solve the problems of difficult waste liquid treatment, low current efficiency, anode plate corrosion, etc., to reduce the concentration of incomplete oxidation products, improve the leaching rate, and complete the reduction reaction. Effect

Inactive Publication Date: 2015-09-30
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the organic reduction method of pyrolusite, such as the complex oxidation product of the reducing agent, the corrosion of the anode plate, the low current efficiency, and the difficulty of waste liquid treatment, etc., and to provide a method for producing no or low-concentration oxidation products. The organic reduction method of pyrolusite

Method used

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  • A method for synergistic reduction of pyrolusite by low-carbon organic matter
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  • A method for synergistic reduction of pyrolusite by low-carbon organic matter

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Effect test

Embodiment 1

[0029] 1. Raw material composition and weight:

[0030] 10Kg pyrolusite, 18Kg concentrated sulfuric acid, 90Kg water, 1.8Kg formic acid, 0.8Kg oxalic acid.

[0031] 2. Preparation method:

[0032] Take 10Kg of pyrolusite in the reaction kettle, add 90Kg of water, stir and heat to 90-95°C, stop heating, slowly add 18Kg of concentrated sulfuric acid, then continue stirring for 20 minutes, then add 0.8Kg of oxalic acid, and react at 90-95°C for 1.5 Hour, finally add formic acid 1.8Kg, continue stirring reaction 2 hours, filter, obtain manganese sulfate solution. Determination of manganese content in manganese sulfate solution by conventional methods, calculation of manganese leaching rate, while using high performance liquid phase determination of organic content.

Embodiment 2

[0034] 1. Raw material composition and weight:

[0035] 10Kg pyrolusite, 14Kg concentrated sulfuric acid, 95Kg water, 1.5Kg formaldehyde, 0.6Kg oxalic acid, 1.0Kg glucose.

[0036] 2. Preparation method:

[0037] Take 10Kg of pyrolusite in a reaction kettle, add 95Kg of water, stir and heat to 90-95°C, then stop heating, slowly add 14Kg of concentrated sulfuric acid, then continue stirring for 30 minutes, add glucose 1.0Kg, oxalic acid 0.6Kg, 90-95 The reaction was carried out at ℃ for 2 hours, and finally 1.5Kg of formaldehyde was added, and the reaction was continued to stir for 3 hours, and filtered to obtain a manganese sulfate solution. Determination of manganese content in manganese sulfate solution by conventional methods, calculation of manganese leaching rate, while using high performance liquid phase determination of organic content.

Embodiment 3

[0039] 1. Raw material composition and weight:

[0040] 10Kg of pyrolusite, 22Kg of concentrated sulfuric acid, 90Kg of water, 1.2Kg of formic acid, 0.2Kg of lactic acid, 0.2Kg of citric acid, and 0.5Kg of oxalic acid.

[0041] 2. Preparation method:

[0042] Take 10Kg of pyrolusite in a reaction kettle, add 90Kg of water, stir and heat to 90-95°C, then stop heating, slowly add 22Kg of concentrated sulfuric acid, then continue stirring for 30 minutes, add 0.2Kg of citric acid, 0.2Kg of lactic acid, and 0.5 Kg, react at 90-95°C for 2 hours, finally add 1.2Kg of formic acid, continue to stir and react for 3 hours, filter to obtain manganese sulfate solution. Determination of manganese content in manganese sulfate solution by conventional methods, calculation of manganese leaching rate, while using high performance liquid phase determination of organic content.

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Abstract

The invention discloses a method for synergistically reducing pyrolusite by using organic matters with low carbon numbers. The method is characterized in that raw components comprise 10 parts of pyrolusite, 0.5-2.5 parts of C1 organic reducing agent, 0.1-1.8 parts of Cn (n is greater than or equal to 2 and is less than or equal to 6) organic reducing agent, 8-30 parts of concentrated sulfuric acid and 70-100 parts of water in parts by weight. The technological processes comprise infiltration, two-step synergistic reduction reaction, filtration and the like. According to the method, the reduction of the pyrolusite is realized by two-step reduction through the synergistic effect of one or more than one Cn (n is greater than or equal to 2 and is less than or equal to 6) organic reducing agents and the C1 organic reducing agent so as to obtain a manganese sulfate solution with relatively low organic content. The organic reducing agents with the low carbon numbers have excellent synergistic reduction property and high manganese leaching efficiency; the problem that the single organic reducing agent generates lots of incomplete oxidative products is solved; the cost of the organic reducing agents is reduced through the synergetic effect; the method has low requirements on two-step reduction reaction conditions and relatively good economic benefits and social benefits, is simple in process, easy to operate and relatively low in production cost and facilitates industrial production.

Description

technical field [0001] The invention belongs to the technical field of pyrolusite reduction, relates to a method for organic matter wet reduction of pyrolusite, in particular to a method for synergistically reducing pyrolusite with low-carbon organic matter. Background technique [0002] To produce electrolytic manganese from pyrolusite (manganese dioxide), the tetravalent manganese must first be reduced to divalent manganese. There are two reduction methods: fire reduction and wet reduction. The fire method is generally to reduce and roast the soft manganese ore with a reducing agent such as coal, so that the high-priced MnO in the ore is transformed into low-priced MnO, and then leached with sulfuric acid. Although this method has been industrialized for many years, there are problems such as large equipment investment, high energy consumption, poor operating conditions, and serious environmental pollution. The wet reduction method uses inorganic, organic reducing agents...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B47/00
Inventor 袁爱群卢有志郭雨桐马少妹黄增尉周泽广
Owner GUANGXI UNIV FOR NATITIES
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