Microwave extraction method for pyrrhotite

A pyrrhotite and extraction method technology, applied in the field of hydrometallurgy, can solve problems such as low extraction rate and waste, and achieve the effects of improving leaching rate, improving production efficiency and accelerating reaction

Inactive Publication Date: 2016-12-14
铜仁市万山区盛和矿业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the extraction rate of gold extracted from the solution in the prior art is low, 80-90%, and a large amount of gold elements are discharged with the waste liquid, resulting in waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A microwave extraction method for pyrrhotite, comprising the following steps:

[0029] (1) Pretreatment: crush the pyrrhotite to a fineness of 80 meshes, and send the pyrrhotite powder into the reaction tank, and add the pyrrhotite powder to the reaction tank at a concentration of 1 times the weight of 2mol / L Nitric acid solution, and the stirring speed of the stirrer is 40r / min to stir for 1h, then add 0.7 times the weight of nitric acid solution to it, and the fineness is 300 mesh sodium nitrite, and after continuing to stir for 20min, it is placed at a temperature of Stand at 60°C for 10 minutes, then add hydrogen peroxide, wherein the amount of hydrogen peroxide is 1 times the weight of sodium nitrite, and control the temperature of the solution to 50°C, then use the calomel electrode as a reference electrode, Measure the potential potential in the solution, adjust and control the potential potential in the solution to ≤450mV, make it continue to react for 3 hours, ...

Embodiment 2

[0035] A microwave extraction method for pyrrhotite, comprising the following steps:

[0036] (1) Pretreatment: crush the pyrrhotite to a fineness of 200 meshes, obtain the pyrrhotite powder and send it into the reaction tank, and add the pyrrhotite powder to the reaction tank at a concentration of 3 times the weight of 3mol / L Nitric acid solution, and the stirring speed of the stirrer is 70r / min to stir for 2h, then add 0.9 times the weight of nitric acid solution to the fineness of 400 mesh sodium nitrite, and continue stirring for 30min, then place it at a temperature of Stand at 70°C for 20 minutes, then add hydrogen peroxide, the amount of hydrogen peroxide is 1.3 times the weight of sodium nitrite, and control the solution temperature to 60°C, then use the calomel electrode as a reference electrode, Measure the potential potential in the solution, adjust and control the potential potential in the solution to ≤450mV, make it continue to react for 4 hours, and obtain the p...

Embodiment 3

[0042]A microwave extraction method for pyrrhotite, comprising the following steps:

[0043] (1) Pretreatment: the pyrrhotite powder is pulverized to a fineness of 120 orders, and the obtained pyrrhotite powder is sent into the reaction tank, and the concentration of 2 times the weight of the pyrrhotite powder is added to the reaction tank to be 2.5mol / L nitric acid solution, and the stirring speed of the stirrer is 50r / min to stir for 1.5h, then add 0.8 times the weight of nitric acid solution to it, and the fineness is 350 mesh sodium nitrite, and after continuing to stir for 25min, place it in Stand at 65°C for 15 minutes, then add hydrogen peroxide, the amount of hydrogen peroxide is 1.2 times the weight of sodium nitrite, and control the solution temperature to 55°C, then use the calomel electrode as a reference Electrode, measure the potential potential in the solution, adjust and control the potential potential in the solution to ≤450mV, make it continue to react for 3...

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PUM

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Abstract

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a microwave extraction method for pyrrhotite. According to the microwave extraction method for the pyrrhotite, in step of pretreatment of the pyrrhotite, the redox potential in a solution is controlled, so that the gold loss ratio is made not to exceed 0.1%; and furthermore, in the leaching procedure, microwaves are made to act on substance molecules by means of the peculiar properties of the microwaves, so that the molecules are made to accelerate, mutual friction between the molecules is achieved to generate a large quantity of heat, a reaction is accelerated, the reaction time is greatly shortened, and the production efficiency is improved. In addition, the gold leaching rate is greatly increased.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a microwave extraction method for pyrrhotite. Background technique [0002] Gold is born with minerals, such as sulfide gold ore, which can be specifically divided into ore resources such as pyrite, pyrrhotite, and pyrrhotite. Moreover, the existence form of gold in the ore is mainly the combination of ultrafine particles and iron ore, and the ultrafine particles are small to the submicroscopic particle level, so that most of the gold is embedded in the molecular lattice of the ore, which is consistent with the iron ore. The ore forms a mutual solution; this feature makes it difficult to expose the gold from the ore when the ore is mechanically ground or crushed to the maximum fineness, especially the gold in pyrrhotite is adsorbed in the internal crystal lattice It is more difficult to expose, and then it is difficult to form gold particles on the free surface, which ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/04
CPCC22B3/045C22B11/04Y02P10/20
Inventor 袁再六
Owner 铜仁市万山区盛和矿业有限责任公司
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