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Method for leaching manganese carbonate ore

A manganese carbonate ore leaching technology, applied in the field of manganese carbonate ore leaching, to achieve the effects of saving production costs, increasing leaching rate, and avoiding environmental pollution

Inactive Publication Date: 2015-07-15
SICHUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the current problem of manganese carbonate leaching, the purpose of the present invention is to find a method for leaching manganese carbonate with high leaching rate, fast leaching speed, low energy consumption and no increase in subsequent process burden, which is characterized in that manganese carbonate ore powder of ≤180 mesh Add rice bran ≤ 1.5mm into a pressure-resistant, sulfuric acid and nitric acid corrosion-resistant reaction kettle, add sulfuric acid solution for the first stage of leaching, and the CO produced by leaching 2 Exhaust from the exhaust port

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: 1000g of manganese carbonate ore powder (containing 25.2% divalent manganese, 3.1% tetravalent manganese, Fe 2 O 3 10.7%, particle size of 180 mesh) and 49g of ≤1.5mm bran are added to a 5L titanium-lined pressure reactor, and 2700ml of 2.0mol / L sulfuric acid solution is added under the condition that the exhaust valve is opened and the intake valve is closed. Stir at 60~70℃ (stirring speed 80r / min) for 2h. Then add 6g of nitric acid (with HNO 3 Calculate), continue to seal and leaching for 1h. Afterwards open O 2 Inlet valve into O 2 Oxidize the leachate for 0.5h (relative pressure in the reactor is 0.3MPa). After the leaching is completed, liquid-solid separation and leaching residue washing are performed. According to the analysis result of the leaching residue after washing, the leaching rate of manganese is 99.0%.

Embodiment 2

[0035] Example 2: Combine 10kg of manganese carbonate ore powder (containing 25.2% divalent manganese, 3.1% tetravalent manganese, Fe 2 O 3 10.7%, particle size of 180 mesh) and 590g of rice bran ≤ 1.5mm were added to a 150L titanium-lined pressure reactor, with the exhaust valve opened and the intake valve closed, 120L of 0.446mol / L sulfuric acid solution was added ( The sulfuric acid solution is prepared from the electrolytic residue produced by the electrolytic manganese plant, and the residue contains Mn 2+ 13.5g / L, H 2 SO 4 34.5g / L). Stir at 50~60℃ (stirring speed 70r / min) for 3h. Then add 720g of nitric acid (with HNO 3 Calculate), continue to seal and leaching for 2 h. Access O afterwards 2 Oxidize the leachate for 1h (relative pressure in the reactor is 0.1MPa). After the leaching is completed, liquid-solid separation and leaching residue washing are performed. According to the analysis results of the leaching residue after washing, the leaching rate of manganese ...

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Abstract

The invention discloses a method for leaching manganese carbonate ore. The method comprises the steps of adding manganese carbonate ore powder and rice bran together into a reaction kettle which is resistant to pressure and the corrosion of sulfuric acid and nitric acid, adding a sulfuric acid solution to carry out first-stage leaching, and exhausting CO2 which is generated during leaching from an exhaust opening; when CO2 is basically exhausted completely, adding nitric acid to carry out second-stage closed leaching; after the second-stage closed leaching is ended, introducing industrial pure oxygen to oxidize a leachate.

Description

technical field [0001] The invention relates to a leaching method of manganese carbonate ore. Background technique [0002] Manganese carbonate ore is an important raw material for the production of manganese metal, manganese sulfate, manganese dioxide, manganese nitrate and other materials. The wet process is the main process for producing the above materials, and the leaching process is an essential process in this process. In the wet process of producing metal manganese, manganese sulfate and manganese dioxide, sulfuric acid leaching system is basically used. Since manganese carbonate contains a certain amount of MnO 2 , MnO 2 It is insoluble in sulfuric acid, so that when sulfuric acid is used to leach manganese carbonate ore, the leaching rate of the target metal manganese is not high, resulting in waste of resources. Although adding Fe to the leaching system 2+ , glucose and other reducing agents can increase the leaching rate of manganese, but adding Fe 2+ It w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B47/00
CPCY02W30/54Y02P10/20
Inventor 龙炳清曹攀秦丹
Owner SICHUAN NORMAL UNIV