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Pressurizing and reductive leaching method of pyrolusite powder

A technology of pyrolusite powder and leaching, which is applied in the field of manganese hydrometallurgy and hydrometallurgy, can solve the problems of unsuitable low-grade pyrolusite treatment, serious environmental pollution, and strong corrosion of materials, and achieve low material prices and high process efficiency. Simple process and high leaching rate

Inactive Publication Date: 2012-03-07
YUNNAN JIANSHUI MANGANESE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these leaching methods have complex processes, high production costs, or strong corrosive materials and serious environmental pollution, so they are not suitable for the treatment of low-grade pyrolusite

Method used

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  • Pressurizing and reductive leaching method of pyrolusite powder
  • Pressurizing and reductive leaching method of pyrolusite powder
  • Pressurizing and reductive leaching method of pyrolusite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1: The low-grade pyrolusite contains 21.14wt% manganese.

[0055] Mix low-grade pyrolusite powder containing 21.14% manganese with finely ground pyrite powder, and mix the mixed mineral powder with a sulfuric acid solution with an acid concentration of 140g / L; add the slurry to 2L of titanium In the acid-resistant autoclave, continuously feed compressed air to maintain the pressure in the autoclave at 0.5MPa and the temperature at 120°C for pressure leaching, and the leaching time is 60min. After leaving the kettle, solid-liquid separation is carried out to obtain manganese sulfate solution.

Embodiment 2

[0056] Example 2: The low-grade pyrolusite contains 28.38% manganese. .

[0057] Mix low-grade pyrolusite powder containing 28.38% manganese with finely ground pyrite powder, and mix the mixed mineral powder with a sulfuric acid solution with an acid concentration of 120g / L; add the slurry to 2L of titanium In the acid-resistant autoclave, continuously feed nitrogen to maintain the pressure in the autoclave at 0.8Mpa and the temperature at 100°C, and perform pressure leaching for 120 minutes. After leaving the kettle, solid-liquid separation is carried out to obtain manganese sulfate solution.

Embodiment 3

[0058] Example 3: The low-grade pyrolusite contains 26.53% manganese.

[0059] Mix the low-grade pyrolusite powder containing 26.53% manganese with the finely ground pyrite powder, and mix the mixed mineral powder with a sulfuric acid solution with an acid concentration of 80g / L; add the slurry to 2L of titanium In the acid-resistant autoclave, continuously feed compressed air to maintain the pressure in the autoclave at 1.2Mpa and the temperature at 150°C, and perform pressure leaching for 90 minutes. After leaving the kettle, solid-liquid separation is carried out to obtain manganese sulfate solution.

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Abstract

The invention discloses a pressurizing and reductive leaching method of pyrolusite powder. The method comprises the following steps of: a) mixing pyrolusite powder and iron sulfide powder to obtain mixed powder; b) adding a sulphuric acid solution in the mixed powder to pulp and obtain mixed slurry; c) adding the mixed slurry in an autoclave; d) injecting a gas in the autoclave to ensure that the inner pressure of the autoclave reaches a preset pressure value continuously and perform acid leaching under a pressure, then discharging to obtain an acid leaching mixture; and e) performing solid-liquid separation to the acid leaching mixture to obtain a manganese sulfate solution, wherein the pyrolusite powder contains 13-35wt% of manganese. According to the pressurizing and reductive leaching method of pyrolusite powder in the embodiment of the invention, by adopting the pressurizing and leaching method, the manganese in low-grade pyrolusite powder can be leached fast and effectively.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to the technical field of manganese hydrometallurgy. Background technique [0002] my country's pyrolusite reserves are about 50 million tons, most of which are low-grade lean ore. At present, the shortage of manganese ore resources is restricting the production and sustainable development of manganese products in my country. In some areas where the production of manganese products is concentrated in China, the grade of manganese carbonate ore used has been reduced from 18% to 20% manganese to only 13% to 15%. On the other hand, a large amount of pyrolusite (mainly composed of manganese dioxide) containing 20% ​​to 25% manganese cannot be utilized because of the high cost of the reduction process or serious environmental pollution. It can be seen that the research on how to use pyrolusite economically and rationally, especially to solve the bottleneck technical problem of ...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B47/00
Inventor 王吉坤王运正谢红艳张承贵嵇晓沧马进杨世诚李天杰纳吉信张学文彭东
Owner YUNNAN JIANSHUI MANGANESE
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