Method for producing manganese sulfate by acid leaching under pressure of pyrolusite and pyrite

A pyrolusite and pyrite technology, applied in manganese sulfate and other directions, can solve the problems of high manganese content in slag, poor pyrolusite leaching effect, weak reaction intensity, etc., and achieves simplified process flow, efficient direct leaching, and process enhancement. Effect

Inactive Publication Date: 2009-02-04
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the direct reduction and leaching of pyrolusite has the following disadvantages: under normal pressure, the reaction temperature is not high, and the maximum temperature is only about 90°C, so the reaction intensity is weak, the reaction time is long, and the ma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Embodiment 1: pyrolusite contains 20.93% manganese, and pyrite contains 39.52% iron.

[0012] Mix manganese-containing 20.93% pyrolusite and pyrite at a mass-to-weight ratio of 1:0.3-0.4, and then mix it with a sulfuric acid solution containing 100-140g / l of acid. After mixing, add a volume of 2L, made of titanium Nitrogen gas leaching is carried out in the acid-resistant autoclave made, and the pressure leaching is carried out by maintaining the pressure in the autoclave at 0.3Mpa and the temperature at 100°C-110°C. The leaching time is 60 minutes and the material is discharged, and the slag liquid is separated. 94.41%, and the leaching residue contains 1.48% manganese.

Example Embodiment

[0013] Embodiment 2: pyrolusite contains 20.93% manganese, and pyrite contains 39.52% iron.

[0014] Mix manganese-containing 20.93% pyrolusite and pyrite at a mass-to-weight ratio of 1:0.4-0.45, and then mix it with a sulfuric acid solution containing 140-180g / l of acid. After mixing, add a volume of 2L, made of titanium Carry out nitrogen gas leaching in the acid-resistant autoclave made, maintain the pressure in the autoclave of 0.3MPa, and carry out pressure leaching of pyrolusite at a temperature of 100°C to 110°C. After leaching for 120 minutes, the material is discharged, and the slag liquid is separated to obtain: manganese The leaching rate is 95.52%, and the leaching residue contains 1.11% manganese.

Example Embodiment

[0015] Embodiment 3: pyrolusite contains 31.07% manganese, and pyrite contains 39.52% iron.

[0016] Mix manganese-containing 31.07% pyrolusite and pyrite at a mass-to-weight ratio of 1:0.4-0.45, then mix with a sulfuric acid solution containing 140-180g / l of acid, and add a 2L volume made of titanium Carry out nitrogen gas leaching in an acid-resistant autoclave, maintain the pressure in the autoclave at 0.5Mpa and the temperature at 100°C to 110°C, and carry out pressure leaching of pyrolusite. The leaching time is 120 minutes, and the material is discharged, and the slag liquid is separated to obtain: manganese leaching rate It is 94.12%, and the leaching residue contains 1.33% manganese.

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Abstract

The invention discloses a method for producing manganese sulfate from the acid leaching of pyrolusite and pyrite under pressure, which includes the following steps: (1) after the pyrolusite and pyrite are mixed according to the proportions of 1:0.3 to 0.5 based on the mass ratio of the pyrolusite and pyrite, sulfate with the acidity of 100 to 220g/l is adopted for size mixing; (2) after the size mixing is finished, the materials are added into an autoclave, and the pressure in the autoclave is controlled from 0.3 to 1.0MPa, and the temperature is controlled from 100 to 110 DEG C for the manganese leaching reaction under pressure; after the time of reaction is for 60 to 180 minutes, the slag is discharged and the slag liquid is separated. The method can leach the manganese in the pyrolusite within a short time with different acidities under certain pressure and higher temperature and the leaching rate of the manganese is about 95 percent and the content of manganese in the slag is less than 1.5 percent.

Description

technical field [0001] The invention relates to the field of manganese hydrometallurgy, more specifically, a smelting method for producing manganese sulfate by reducing pyrolusite with pyrite under pressure. Background technique [0002] The traditional process of producing manganese sulfate from pyrolusite is reduction roasting and sulfuric acid leaching. The process of this method has a history of several decades, and the process is mature. It has been the main method of manganese sulfate production for a long time. However, due to material drying, fine grinding, reduction roasting, etc., this process results in high energy consumption, high labor intensity for workers, and high-temperature operations; at the same time, dust and smoke will be generated to pollute the environment, and the production cost is high. , the economic benefits are low. At present, the direct reduction leaching process of pyrolusite has been applied in industrial production. This method is an ide...

Claims

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Application Information

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IPC IPC(8): C01G45/10
Inventor 王吉坤阎江峰臧建李小英杨大锦彭建蓉
Owner KUNMING METALLURGY INST
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