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Leaching method of manganese carbonate ore

A manganese carbonate ore and leaching technology are applied in the field of leaching of manganese carbonate ore to achieve the effects of simplifying the subsequent purification process, high speed and saving production costs

Inactive Publication Date: 2015-11-25
SICHUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 the forage powder of ≤1.5mm into the 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

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Embodiment 1

[0034] Embodiment 1: 1000g manganese carbonate ore powder (containing divalent manganese 25.2%, tetravalent manganese 3.1%, Fe 2 o 3 10.7%, particle size 180 mesh) and ≤1.5mm forage powder 49g was added to a titanium-lined pressure reactor with a volume of 5L, and 2700ml of 2.0mol / L sulfuric acid solution was added under the condition that the exhaust valve was opened and the intake valve was closed. Stir at 60-70°C (stirring speed 80r / min) for leaching for 2h. Then add nitric acid 6g (as HNO 3 meter), and continue the airtight leaching for 1h. After that open O 2 Intake valve into O 2 Oxidize the leach solution for 0.5h (the relative pressure in the reactor is 0.3MPa). After the leaching is finished, liquid-solid separation and washing of the leaching residue are carried out. According to the test and analysis results of the leached slag after washing, the leaching rate of manganese is 98.9%.

Embodiment 2

[0035] Embodiment 2: 10kg manganese carbonate ore powder (containing divalent manganese 25.2%, tetravalent manganese 3.1%, Fe 2 o 3 10.7%, particle size 180 mesh) and ≤1.5mm forage powder 590g was added to a titanium-lined pressure reactor with a volume of 150L, ​​and 0.446mol / L sulfuric acid solution 120L was added under the condition that the exhaust valve was opened and the intake valve was closed ( The sulfuric acid solution is prepared from the electrolytic raffinate produced by the electrolytic manganese plant, and the raffinate contains Mn 2+ 13.5g / L,H 2 SO 4 34.5g / L). Stir at 50-60°C (stirring speed 70r / min) for leaching for 3h. Then add nitric acid 720g (as HNO 3 meter), and continue the airtight leaching for 2h. Thereafter pass O 2 Oxidize the leachate for 1 hour (the relative pressure in the reactor is 0.1MPa). After the leaching, the liquid-solid separation and the washing of the leaching residue are carried out. According to the laboratory analysis result...

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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 forage grass powder 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 wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B47/00
CPCY02P10/234Y02P10/20
Inventor 龙炳清陈俊万旭
Owner SICHUAN NORMAL UNIV
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