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A kind of methanesulfonic acid system bismuth sulfide concentrate oxygen pressure leaching method

A methanesulfonic acid and oxygen pressure leaching technology, which is applied in the direction of improving process efficiency, can solve the problems of high corrosion of equipment, complicated operation process, and low bismuth leaching rate, and achieve high solubility, simple operation, and high-efficiency leaching Effect

Active Publication Date: 2021-06-18
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for oxygen pressure leaching of bismuth sulfide concentrate in methanesulfonic acid system, to solve the problem of low bismuth leaching rate, complex operation process and pollution in the existing bismuth smelting process mentioned in the above background technology. High, high corrosion to equipment, high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Process principle of the present invention is as follows:

[0024] 2 Bi 2 S 3 +12CH 3 SO 3 H+3O 2 =4Bi(CH 3 SO 3 ) 3 +6S 0 +6H 2 o

[0025] A methanesulfonic acid system bismuth sulfide concentrate oxygen pressure leaching method comprises the steps of:

[0026] Take 125g of bismuth sulfide concentrate (containing 23% Bi) and carry out grinding work. Grind the bismuth sulfide concentrate to 97% so that the particle size of the concentrate is less than 30μm. Add 400g / L methanesulfonic acid and 9g / L iron to extract agent, make the volume of liquid and the mass ratio of solid be 8:1, then add surfactant, wherein surfactant adopts calcium lignosulfonate, the addition amount is 0.7% of raw material quality, the ore pulp prepared is added into autoclave, At the same time, the autoclave was heated to 135°C, and the temperature was controlled to be stable at 135°C, then oxygen was introduced, the pressure was 1.0MPa, the stirring speed was 400 rpm, and the reaction t...

Embodiment 2

[0028] Process principle of the present invention is as follows:

[0029] 2 Bi 2 S 3 +12CH 3 SO 3 H+3O 2 =4Bi(CH 3 SO 3 ) 3 +6S 0 +6H 2 o

[0030] A methanesulfonic acid system bismuth sulfide concentrate oxygen pressure leaching method comprises the steps of:

[0031] Take 125g of bismuth sulfide concentrate (containing 23% Bi) and carry out grinding work. Grind the bismuth sulfide concentrate to 97% so that the particle size of the concentrate is less than 50 μm. Add 280g / L of methanesulfonic acid and 9g / L of iron Leaching agent, make the volume of liquid and the mass ratio of solid be 8:1, then add surfactant, wherein surfactant adopts sodium lignosulfonate, and the addition consumption of sodium lignosulfonate is 0.7% of raw material quality, Put the prepared pulp into the autoclave, heat the autoclave to 135°C at the same time, and control the temperature to stabilize at 135°C, then feed oxygen, the pressure is 1.0MPa, the stirring speed is 400 rpm, the reactio...

Embodiment 3

[0033] Process principle of the present invention is as follows:

[0034] 2 Bi 2 S 3 +12CH 3 SO 3 H+3O 2 =4Bi(CH 3 SO 3 ) 3 +6S 0 +6H 2 o

[0035] A methanesulfonic acid system bismuth sulfide concentrate oxygen pressure leaching method comprises the steps of:

[0036] Take 100g of bismuth sulfide concentrate (containing Bi23%), and carry out grinding work. Grind the bismuth sulfide concentrate to 97%, so that the particle size of the concentrate is less than 30μm, and add a leaching agent containing 300g / L of methanesulfonic acid and 5g / L of iron , make the volume of liquid and the mass ratio of solid be 10:1, then add surfactant, wherein surfactant adopts lignite, and the addition consumption of lignite is 0.6% of raw material quality, the ore slurry that is prepared is added into autoclave, simultaneously The autoclave was heated to 90°C, and the temperature was controlled to stabilize at 90°C, then oxygen was introduced to control the pressure in the autoclave t...

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Abstract

The invention discloses a method for oxygen pressure leaching of bismuth sulfide concentrate in methanesulfonic acid system, comprising the following steps: S1, material pretreatment: adding bismuth sulfide concentrate into a vertical mill, and using the vertical mill to sulfide The bismuth concentrate is finely ground, and then the screened material is dried for later use; S2, liquid preparation: according to the iron-containing phase and iron content in the material, appropriately add iron powder to the methanesulfonic acid solution, and then stir the solution , so that iron powder and methanesulfonic acid solution are fully mixed to obtain iron-containing methanesulfonic acid leaching agent. The present invention replaces the traditional oxidation-reduction roasting fire process by adopting oxygen pressure leaching technology, extracts bismuth efficiently, and also avoids the generation of low-concentration sulfur dioxide from the root. High yield, up to more than 93%, and simple process, the method is simple to operate, can efficiently dissolve bismuth, obtain sulfur products, and does not produce SO 2 , has the advantage of environmental protection.

Description

technical field [0001] The invention relates to the related technical field of ferrous metal hydrometallurgy, in particular to an oxygen pressure leaching method of bismuth sulfide concentrate in a methanesulfonic acid system. Background technique [0002] The bismuth smelting process is divided into two types: pyromethod and wet method. Bismuth pyrometallurgy is suitable for raw materials with high bismuth content. The specific processes include smelting smelting, precipitation smelting, reduction smelting, mixing smelting and low-temperature alkaline smelting. For example, Chinese patent CN103305707A discloses a method for smelting bismuth concentrate; that is, metal oxide is used as a sulfur-fixing agent, sodium carbonate is used as a reaction solvent, and carbon is used as a reducing agent to melt at 750-950° C. to obtain rough bismuth; the method can Efficiently obtain coarse bismuth, simple equipment, short production cycle, but there is also low concentration of SO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B30/06C22B3/16
CPCC22B3/165C22B30/06Y02P10/20
Inventor 陈永明王恒辉邓鑫杰杨声海周晓源何静何醒民
Owner CENT SOUTH UNIV
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