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Method for reduction, self vulcanization and dearsenification of refractory high-arsenic high-sulphur gold ore

An intractable, self-vulcanizing technology, applied in the field of gold smelting, can solve problems such as short process flow, and achieve the effect of short process flow, simple process and strong practicability

Inactive Publication Date: 2016-08-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the highly toxic As produced in the existing oxidative roasting dearsenic process 2 o 3 The purpose of the present invention is to provide a method for fully utilizing the arsenic and sulfur components of high-arsenic and high-sulfur gold ore itself, in the presence of reducing agents, to achieve deep arsenic and sulfur removal of high-arsenic and high-sulfur gold ore , the method does not pollute the environment with SO 2 and As 2 o 3 With short process flow, simple operation and low cost, it provides reliable technical support and valuable application reference value for today's non-ferrous metal industry to take the clean production route

Method used

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Effect test

Embodiment 1

[0035] A high-arsenic and high-sulfur gold mine in Hunan is used as raw material. The gold mine contains 8.26% As, 16.16% Fe, 10.76% S, 18.92% Si, 6.64% Al, 5.13% Ca and 32.90% O. After the gold ore is evenly mixed with 8% coal, it is roasted in a rotary kiln at 800°C, the material residence time is controlled at about 2 hours, and the hot calcined sand is directly water quenched after arsenic removal. The results show that the ignition loss rate of the material is about 23.31%, the removal rate of arsenic is 95.94%, the arsenic in the volatile matter is mainly arsenic sulfide, and the arsenic content of the sample after burning is only 0.48%.

Embodiment 2

[0037]Using a high-arsenic and high-sulfur gold mine in Yunnan as raw material, the gold mine contains As 6.72%, Fe 17.28%, and S 11.05. After roasting in an electric furnace at 700°C for 1.5h in 18% CO gas, stop heating, and cool to room temperature under nitrogen protection, take out the sample, weigh it, and take a sample for analysis. The results show that the loss on ignition rate of the sample is about 21.08%, the removal rate of arsenic is 93.66%, the arsenic in the volatile matter is mainly arsenic sulfide, and the arsenic content in the sample after burning is only 0.54%.

Embodiment 3

[0039] A high-arsenic and high-sulfur gold mine in Guangxi is used as raw material. The gold mine contains As 15.88%, Fe 22.22%, and S 21.32. After roasting in an electric furnace at 850°C for 2.5 hours in 68% CO gas, stop heating, cool to room temperature under nitrogen protection, take out samples, weigh them, and take samples for analysis. The results show that the burning loss rate of the sample is about 31.11%, the removal rate of arsenic is 96.4%, the arsenic in the volatile matter is mainly arsenic sulfide, and the arsenic content of the sample after burning is only 0.83%.

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Abstract

The invention discloses a method for reduction, self vulcanization and dearsenification of refractory high-arsenic high-sulphur gold ore. The method includes the steps that the high-arsenic high-sulphur gold ore is roasted on the condition of the medium and low temperature in the presence of a reduction agent; and the obtained roasted ore is isolated from air cooling, so that the gold ore product with arsenic removed is obtained. By means of the method, arsenic and sulphur in the high-arsenic high-sulphur gold ore are volatilized and removed as arsenic sulfide; since the arsenic sulfide is low in toxicity, and no external sulphur source or other additives is needed in the roasting process, compared with an existing oxidation roasting method, the method has the advantages of being economical and environmentally friendly. Besides, the technical process is short, practicability is high, and the method can be applied and popularized advantageously.

Description

technical field [0001] The present invention relates to a method for removing arsenic in refractory high-arsenic and high-sulfur gold ore, in particular to a method for removing arsenic and sulfur in the form of arsenic sulfide contained in high-arsenic and high-sulfur gold ore by reduction; It belongs to the technical field of gold smelting. technical background [0002] With the continuous development of the gold industry, the gold ore resources that are easy to be directly extracted are gradually exhausted, and the refractory gold ore containing arsenic and sulfur has become an important raw material for gold production. Due to the complex composition of arsenic-containing gold ore, the embedded distribution of gold is generally fine-grained or microscopic and submicroscopic and disseminated in pyrite, pyrrhotite and arsenopyrite. There are adverse effects, so that the recovery rate of gold under cyanide leaching conditions is very low, only 50% to 70%. Studies have sho...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B5/02
CPCC22B1/02C22B5/02
Inventor 刘维焦芬覃文庆蔡练兵韩俊伟杨康
Owner CENT SOUTH UNIV
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