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Bismuth extraction method based on bismuth sulfide ore phase conversion

A technology of bismuth sulfide ore and phase transformation, applied in the direction of improving process efficiency, etc., can solve the problem of low content of impurity elements in the leaching solution, and achieve the effect of low iron concentration

Active Publication Date: 2019-12-31
CINF ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the increasingly stringent environmental protection requirements and certain defects in the existing bismuth extraction process, one of the purposes of the present invention is to provide a two-stage leaching method for extracting bismuth based on the phase transformation of bismuth sulfide ore, which is simple to operate and can efficiently dissolve Bismuth, the obtained leaching solution contains less impurity elements and does not produce SO 2 , the environmental protection advantage is obvious

Method used

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  • Bismuth extraction method based on bismuth sulfide ore phase conversion

Examples

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Effect test

Embodiment 1

[0039] Take 125g of bismuth sulfide concentrate (containing Bi23wt%), grind until 97% of the concentrate particle size is less than 30μm, add a phase inversion agent containing 100g / L of methanesulfonic acid and 40g / L of iron, and the liquid-solid mass ratio is 8:1, The surface active agent is calcium lignosulfonate, the dosage is 0.7% of the raw material mass of bismuth sulfide concentrate, and it is prepared into pulp; the prepared pulp is put into the autoclave, and oxygen is introduced, and the temperature is controlled at 160°C, the pressure is 1.6MPa, and the stirring speed is 400 rpm, reaction time 100min, carry out oxygen pressure phase inversion reaction, liquid-solid separation after the reaction, after drying the phase inversion slag, add leaching agent (containing 4mol / L methylsulfonate acid; the addition amount is 1.4 times the theoretical amount of bismuth), and under the condition of stirring intensity of 200 rpm, after leaching for 120 minutes, the solid and liq...

Embodiment 2

[0041]Take 125g of bismuth sulfide concentrate (containing Bi23wt%), grind until 97% of the concentrate particle size is less than 50μm, add a phase inversion agent containing 200g / L of methanesulfonic acid and 20g / L of iron, and the mass ratio of liquid to solid is 8:1. Sodium lignosulfonate is used as the surfactant, and the amount added is 0.7% of the mass of the bismuth sulfide concentrate raw material, and it is prepared into a pulp; the prepared pulp is added to the autoclave, and oxygen is introduced, and the temperature is controlled at 140°C, the pressure is 1.2MPa, and the stirring speed is 400 rpm, reaction time 120min, oxygen pressure phase inversion reaction, liquid-solid separation after the reaction, drying the phase inversion slag, and then adding leaching agent to the phase inversion slag at 70°C (addition amount is 1.2 times bismuth theory amount; containing 3mol / L hydrochloric acid), under the condition of stirring intensity of 200 rpm, after leaching for 120...

Embodiment 3

[0043] Take 125g of bismuth sulfide concentrate (containing Bi23wt%), grind until 97% of the concentrate particle size is less than 30μm, add a phase inversion agent containing 300g / L of methanesulfonic acid and 40g / L of iron, and the liquid-solid mass ratio is 10:1. The surface active agent is lignite, and the added amount is 0.6% of the raw material mass of bismuth sulfide concentrate, and it is prepared into a slurry; the prepared slurry is put into an autoclave, and oxygen is introduced, and the temperature is controlled at 140°C, the pressure is 1.1MPa, and the stirring speed is 500 rpm , the reaction time is 150min, the oxygen pressure phase inversion reaction is carried out, the liquid-solid separation is carried out after the reaction, the phase inversion slag is dried, and the leaching agent is added to the phase inversion slag at 90°C (the addition amount is 1.3 times the theoretical amount of bismuth; containing 5mol / L fluorosilicic acid), under the condition of sti...

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Abstract

The invention relates to a bismuth extraction method based on bismuth sulfide ore phase conversion. The bismuth extraction method comprises the following steps of, mixing a phase conversion agent andbismuth sulfide ore to obtain mixed slurry, wherein the phase inversion agent comprises sulfonic acid, preferably, the bismuth sulfide ore is bismuth sulfide concentrate; placing the mixed slurry in areaction kettle, performing oxygen pressure phase conversion reaction treatment, and performing solid-liquid separation to obtain phase conversion slag and phase conversion liquid; and carrying out acid leaching treatment on the phase inversion slag, and then carrying out solid-liquid separation to obtain leachate and leaching slag. The bismuth extraction method can realize selective leaching ofbismuth, reduce the purification burden of impurity elements such as iron, lead, silicon and the like in leaching solution, and simplify the process flow of recovering bismuth products such as subsequent neutralization hydrolysis, electrodeposition.

Description

technical field [0001] The invention relates to a method for extracting bismuth based on the phase transformation of bismuth sulfide ore, in particular to a two-stage method for extracting bismuth based on the phase transformation of bismuth sulfide ore, which belongs to the technical field of non-ferrous metal wet smelting. Background technique [0002] The wet bismuth smelting process is suitable for bismuth-containing materials with low grade and complex composition. The main processes include leaching, purification and impurity removal (Chinese patent CN106978538A), neutralization and hydrolysis (Chinese patent CN108557881A) or electrodeposition (Chinese patent CN101775619A). For bismuth oxide ores, acidic leaching is generally adopted. For bismuth sulfide ores, most of the bismuth is leached into the solution through oxidation leaching in the chloride salt system. The oxidants used include oxygen, FeCl 3 , Cl 2 , chlorate, nitric acid, etc. After the bismuth leaching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/06C22B3/06C22B3/16
CPCC22B3/06C22B3/165C22B30/06Y02P10/20
Inventor 王恒辉陈永明周晓源邓鑫杰何醒民杨声海何静
Owner CINF ENG CO LTD
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