Technology for preparing thiosulfate on site and extracting gold from refractory gold ore

A technology for thiosulfate and refractory gold ore, which is applied in the direction of thiosulfate/dithionite/polythionate, etc., which can solve the problems of low antimony removal rate, high design and material requirements, and recycling Difficulties and other problems, to achieve the effect of reducing production costs and environmental pressure, significant economic effects, and easy separation and recovery

Active Publication Date: 2018-04-10
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The disadvantage is that the roasting is carried out in an oxygen-containing atmosphere, which releases a large amount of SO 2 、As 2 o 3 and other toxic and harmful gases; the furnace gas dust collection and purification device is complicated, the operating cost is high, and the environment is seriously polluted; the process operation requirements are strict, and it is easy to cause "under-burning" or "over-burning", which affects the recovery rate of gold; the removal rate of antimony is low; Subsequent recycling difficulties
However, the disadvantages of this process are: the design and material requirements of the equipment are very high; the investment in infrastructure is large, and only the construction of a large-scale treatment plant is economically reasonable
The disadvantages are: large amount of waste water, difficult to deal with; poor adaptability to raw materials, not suitable for processing gold-containing charcoal and materials with high arsenic and sulfur content; large consumption of reagents; difficult recovery of arsenic, sulfur and other base metals
However, there are still many problems for thiosulfuric acid leaching gold. The solution of thiosulfate gold leaching system is very complicated, and it also involves S 2 o 3 2- A series of redox reactions of its own, the chemical properties of thiosulfate are unstable, leading to some side reactions, the resulting large consumption of reagents and difficulties in recovery have been difficult to solve

Method used

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  • Technology for preparing thiosulfate on site and extracting gold from refractory gold ore
  • Technology for preparing thiosulfate on site and extracting gold from refractory gold ore

Examples

Experimental program
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Effect test

Embodiment 1

[0148] Example 1 selects a refractory gold mine in Gansu, its composition is gold 46.80g / t, iron 21.91%, sulfur 30.63%, arsenic 3.26%, antimony 4.52%. Take 100g of the refractory gold ore to be crushed and milled to make powder. The powder with a particle size of less than 0.074mm accounts for 50% of the total mass of all powders. Put it into a corundum crucible and put it in a closed heating furnace. The heating furnace is heated by electricity. Nitrogen is used for one-stage roasting, the roasting temperature is controlled at 950°C, and the roasting time is 0.5h. After roasting, primary calcined sand and flue gas A are formed. Put the primary calcined sand in another heating furnace, pass air into it and use microwave heating for secondary roasting, the roasting temperature is 550°C, and the roasting time is 4h, and the roasting will form the secondary calcined sand and gas B. Lower the temperature of gas A to 450°C, mix and react with hydrogen (the molar ratio of gas A to h...

Embodiment 2

[0151] Example 2 selects a refractory gold mine in Anhui, and its composition is 55.8g / t of gold, 21.7% of iron, 20.7% of sulfur, 7.23% of arsenic, and 4.2% of antimony. Take 100g of the refractory gold ore to be crushed and milled into powder. The powder with a particle size of less than 0.074mm accounts for 95% of the total mass of all powders. Put it into a corundum crucible and put it into a closed heating furnace. The heating furnace is heated by hot air. Argon is used for roasting, the roasting temperature is controlled at 650 ° C, and the roasting time is 4 hours. After roasting, a calcined sand and flue gas A are formed. Put the primary calcined sand in another heating furnace, feed a mixed gas with an oxygen content of 10%, and use electric heating for secondary roasting. The roasting temperature is 750°C, and the roasting time is 0.5h. The roasting forms the secondary calcined sand and gas B. . Lower the temperature of gas A to 650°C, mix and react with hydrogen (th...

Embodiment 3

[0154] Example 3 selects a refractory gold mine in Liaoning, and its composition is 35.65g / t of gold, 22.57% of iron, 27.98% of sulfur, and no arsenic and antimony. Take 100g of the refractory gold ore to be crushed and milled into powder. The powder with a particle size of less than 0.074mm accounts for 75% of the total mass of all powders. Put it into a corundum crucible and put it into a closed heating furnace. The heating furnace is heated by electricity. Nitrogen is used for roasting, the roasting temperature is controlled at 700°C, and the roasting time is 2 hours. After roasting, a calcined sand and flue gas A are formed. Put the primary calcined sand in another heating furnace, feed a mixed gas with an oxygen content of 65%, and use electric heating for secondary roasting. The roasting temperature is 650°C, and the roasting time is 2 hours. The roasting forms the secondary calcined sand and gas B. After the gas B is cooled to below 100°C, it is fully absorbed with milk...

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Abstract

The invention relates to a technology for preparing thiosulfate on site and extracting gold from refractory gold ore. The technology comprises the following steps: crushing sulfur-containing refractory gold ore, and powdering by ball milling; roasting the powdered gold ore in one time under inert gas to obtain primary roasted ore and smoke A; roasting the primary roasted ore for the second time inair or oxygen-containing oxide mixed gas so as to obtain secondary roasted ore and gas B; cooling the gas B and charging into an alkaline solution for absorbing, so as to obtain a solution C; mixingthe smoke A and excessive hydrogen, and reacting to obtain a gas product D; reacting the cooled and dedusted gas D and B to generate sulphur; reacting sulphur and the solution C to obtain a thiosulfate solution. In case of gold ore without arsenic antimony, the technology comprises the following steps: cooling the smoke A, and reacting with the solution C to prepare thiosulfate solution; cooling and performing size mixing on the secondary roasted ore; and adding the thiosulfate solution to extract gold. The technology has the advantages of being green, environmentally friend, extracting gold without cyanogen, low in energy consumption, low in cost, high in economic benefit, high in social benefit, and high in environmental benefit.

Description

technical field [0001] The invention belongs to the field of mineral gold extraction, in particular to a process for preparing thiosulfate on site and extracting gold from refractory gold ores. Background technique [0002] Gold is one of the important precious metals. Due to its special physical and chemical properties, gold is not only used for jewelry and financial reserves, but also widely used in electronics, computers, precision instruments, aviation, aerospace and other fields. With the gradual depletion of mineral resources in the world, gold mines are more prominent, and refractory gold mines will become the main resource of gold ore in the future. [0003] The reserves of refractory gold mines account for more than 60% of the world's total gold reserves. This type of gold mines is mainly due to the presence of harmful elements such as sulfur, arsenic, and antimony, which affect the leaching of gold. Especially for gold mines with high sulfur content, there is no e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/14C22B11/00C01B17/64
CPCC01B17/64C22B1/02C22B3/14C22B11/04
Inventor 陈国宝李振溱秦勇朱张甫
Owner NORTHEASTERN UNIV
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