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

A technology of microwave roasting and sulfur-containing gold, which is applied in the direction of improving process efficiency, etc., to shorten the pretreatment time, reduce the cost of leaching gold, and reduce the pressure of environmental protection

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 component of lime sulfur mixture is calcium polysulfide (CaS x ) 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

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

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Experimental program
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Effect test

Embodiment 1

[0036] 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.

[0037] According to the above analysis results, the gold concentrate of the present embodiment is processed according to the following steps:

[0038] 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%;

[0039] 2) Use a jet machine whose gas source is nitrogen to pressurize the ore slurry into the reaction chamber of the microwave roasting furnace to make it form a mist in the reaction chamber of the microwave roasting furnace, and then carry out microwave radiation roasting in the reaction chamber,...

Embodiment 2

[0046] 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.

[0047] According to the above analysis results, the gold concentrate of the present embodiment is processed according to the following steps:

[0048] 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%;

[0049] 2) Pressurize the ore pulp into the reaction chamber of the microwave roasting furnace with a jet machine whose gas source is nitrogen, so that it forms a mist in the reaction chamber of the microwave roasting furnace, and then carry out microwave radiation roasting in the reaction chamber, and the roasting temperature is 300°C , the microwave power is 3kW, and the roasting time is 8 minutes; the sulfur is produced in the form of simple substan...

Embodiment 3

[0056] 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 3.

[0057] According to the above analysis results, the gold concentrate of the present embodiment is processed according to the following steps:

[0058] 1) Put 500g of gold concentrate with a particle size of -200 mesh in a mixing tank and add water to stir, and adjust the slurry until the concentration of the mass percentage of the slurry is 60%;

[0059] 2) Use a jet machine whose gas source is nitrogen to pressurize the ore slurry into the reaction chamber of the microwave roasting furnace, so that it forms a mist in the reaction chamber of the microwave roasting furnace, and then carry out microwave radiation roasting in the reaction chamber, and the roasting temperature is 500°C , the microwave power is 8kW, and the roasting time is 3 minutes; the sulfur is produced in the form of simple substa...

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Abstract

The invention discloses a method for microwave roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral, which includes the following steps: 1) blending 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 carrying out microwave radiation roasting in the reaction chamber; 3) discharging the calcine from the microwave roasting furnace, feeding lime powder, Fe2(SO4)3 and FeSO4 into the calcine, for fine grinding, and heating the fine ground ore pulp; and 4) feeding Na2SO3, ammonia water and copper sulfate into the heated 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. The elemental sulfur produced through anaerobic roasting is compounded into lime sulfur for non-cyanogen gold leaching, therefore the production efficiency and the gold leaching rate are effectively improved.

Description

technical field [0001] The invention relates to a method for microwave 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. Usually, ...

Claims

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Application Information

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