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Method for microwave plasma roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral

A technology of microwave plasma and microwave plasma, which is applied in the direction of improving process efficiency, can solve problems such as groping, and achieve the effect of reducing the pressure of environmental protection and reducing costs

Inactive Publication Date: 2012-10-31
FUJIAN SHUANGQISHAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main components of lime sulfur are calcium polysulfide (CaSx) and calcium thiosulfate (CaS 2 o 3 ), the gold leaching process of the LSSS method can be considered as the combined effect of polysulfide and thiosulfate gold leaching, and its process research is still in the exploratory stage

Method used

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  • Method for microwave plasma roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The gold mineral of this embodiment is the flotation gold concentrate of quartz and pyrite, and the multi-element analysis table of the gold concentrate is shown in Table 1. The valuable element in the gold concentrate is gold, the metal sulfide minerals are mainly pyrite, and the other minerals are mainly quartz and sericite.

[0036] According to the above analysis results, the gold concentrate of the present embodiment is processed according to the following steps:

[0037] 1) Add 300g of gold concentrate with a particle size of -200 mesh into a mixing tank and stir it with water, and adjust the slurry until the concentration of the mass percentage of the slurry is 70%;

[0038] 2) Use a jet machine whose gas source is nitrogen to pressurize the ore slurry into the reaction chamber of the microwave roasting furnace with microwave plasma support, so that it forms a mist in the reaction chamber of the microwave roasting furnace, and use nitrogen as the gas source The ...

Embodiment 2

[0045] The gold mineral of this embodiment is the flotation gold concentrate of quartz and pyrite, and the multi-element analysis table of the gold concentrate is shown in Table 2.

[0046] According to the above analysis results, the gold concentrate of the present embodiment is processed according to the following steps:

[0047] 1) Stir 500g of gold concentrate with a particle size of -200 mesh in a mixing tank with water, and adjust the slurry until the mass percentage concentration of the slurry is 60%;

[0048] 2) Use a jet machine whose gas source is nitrogen to pressurize the ore pulp into the reaction chamber of the microwave roasting furnace with microwave plasma support, so that it forms a mist in the reaction chamber of the microwave roasting furnace, and use nitrogen as the gas source 15g of lime powder is sprayed into the reaction chamber by a jet machine, and then microwave plasma treatment is carried out in the reaction chamber. The roasting temperature is 320°...

Embodiment 3

[0055] The gold mineral of this embodiment is the flotation gold concentrate of quartz and pyrite, and the multi-element analysis table of the gold concentrate is shown in Table 2.

[0056] According to the above analysis results, the gold concentrate of the present embodiment is processed according to the following steps:

[0057] 1) Add 500g of gold concentrate with a particle size of -200 mesh into a mixing tank and stir it with water, and adjust the slurry until the concentration of the mass percentage of the slurry is 80%;

[0058] 2) Use a jet machine whose gas source is nitrogen to pressurize the ore slurry into the reaction chamber of the microwave roasting furnace with microwave plasma support, so that it forms a mist in the reaction chamber of the microwave roasting furnace, and use nitrogen as the gas source 10g of lime powder is sprayed into the reaction chamber by a special jet machine, and then microwave plasma treatment is carried out in the reaction chamber. Th...

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Abstract

The invention discloses a method for microwave plasma roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral, which includes the following steps: 1) feeding water to blend gold concentrate or gold ores into ore pulp; 2) spraying the newly-pressurized the ore pulp into the reaction chamber of a microwave roasting furnace to form spray, and simultaneously spraying lime powder to carry out microwave plasma treatment in the reaction chamber; 3) discharging the calcine from the microwave roasting furnace, feeding Fe2(SO4) 3 and FeSO4 into the calcine, and feeding water for fine grinding; and 4) feeding Na2SO3, copper sulfate and ammonia water into the fine ground ore pulp, and carrying out first-stage LSSS leaching; adding lime sulfur into the washed leaching residue after the first-stage LSSS leaching for second-stage LSSS leaching; and recovering the pyrrhotite from the leaching residue through the magnetic separation method after the second-stage LSSS leaching. By adopting the technical scheme, the leaching rate of the gold in the sulfur-bearing gold mineral or the gold concentrate can be improved to more than 97%.

Description

technical field [0001] The invention relates to a method for microwave plasma roasting and non-cyanide gold leaching of sulfur-containing gold minerals, which is used for pretreatment of sulfur-containing gold ores and gold concentrates. Background technique [0002] With the gradual increase in the price of gold and the increasing application of gold in aerospace, electronics, medicine, information technology and new material industries, the development of gold has also attracted much attention, which has promoted the expansion of the scale of the gold industry and technological progress. In the metallurgical industry, with its excellent characteristics such as selective heating, uniform heating, internal heating, and rapid heating, microwave has made continuous progress in many aspects such as refractory ore pretreatment, mineral leaching, microwave calcination, microwave sintering, microwave drying, and microwave plasma. Progress, microwave metallurgy gradually rises. Us...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B11/00C22B3/14
CPCY02P10/20
Inventor 陈金武郑新烟谢文清
Owner FUJIAN SHUANGQISHAN MINING