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Grinding and leaching pretreatment process of refractory gold ore

A technology for pretreatment and gold ore, which is applied in the field of grinding and leaching pretreatment process of refractory gold ore, can solve the problems of complicated furnace gas dust collection and purification device, incomplete decomposition of sulfide, affecting gold recovery rate, etc. Sub-wrapping, significant economic and social benefits, and the effect of accelerated leaching

Inactive Publication Date: 2018-11-30
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: ① release a large amount of SO 2 、As 2 o 3 and other toxic and harmful gases; ②The furnace gas dust collection and purification device is complicated, the operation cost is high, and the environment is seriously polluted; ③The process operation requirements are strict, and it is easy to cause "under-burning" or "over-burning", resulting in incomplete decomposition of sulfides or secondary packaging Gold, which affects the recovery rate of gold
(2) Pressurized oxidation method, oxygen needs to be introduced during the reaction process, which has high requirements on equipment, high temperature and high pressure, and there are potential safety hazards; high maintenance costs; strict process control conditions, the elemental sulfur produced by the reaction is easy to wrap gold again, affecting gold recovery

Method used

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  • Grinding and leaching pretreatment process of refractory gold ore
  • Grinding and leaching pretreatment process of refractory gold ore

Examples

Experimental program
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Effect test

Embodiment 1

[0053] In this embodiment, a refractory gold mine in Fujian is selected. Most of the gold is wrapped in sulfide, and its composition is 45.6g / t of gold, 15.8% of iron, and 26.4% of sulfur. The specific operation steps and process parameters adopted in this example are as follows: 100 grams of this refractory gold ore is crushed, ball milled, and the particle size is less than 0.074mm, accounting for 95%. Oxygen roasting, the roasting temperature is controlled at 1000°C, and the roasting time is 0.25 hours. The soot produced by roasting is cooled to obtain sulfur, and the grinding media zirconia balls are mixed and dry-milled at a mass ratio of 0.5:1 to the roasted slag, and the grinding time is 150 minutes. After grinding, take out the calcined slag, add acid iron solution containing 200g / L sulfuric acid and 10g / L ferric sulfate to adjust the slurry, the mass ratio of roasted slag and acid iron solution is 1:50. After mixing and sizing, place it in a reaction kettle, control ...

Embodiment 2

[0058] In this example, a refractory gold mine in Gansu is selected. The gold is wrapped in sulfide in the form of fine particles, and its composition is 52.4g / t of gold, 21.5% of iron, 23.6% of sulfur, 1.2% of copper, 7.8% of arsenic, antimony 2.3%. The specific operation steps and process parameters adopted in this example are as follows: 100 grams of this refractory gold ore is crushed, ball milled, and the particle size is less than 0.074 mm, accounting for 65%, and placed in a vacuum furnace for roasting, and the roasting temperature is controlled at 600 ° C. The calcination time is 4 hours, and the reaction residual pressure is 200Pa. Sulfur, arsenic, antimony, arsenic sulfide and antimony sulfide can be obtained by cooling the soot generated by roasting. Add silicon carbide balls with a mass ratio of 50:1 to the calcined slag, then add ferric acid solution containing 200g / L hydrochloric acid and 500g / L ferric chloride to adjust the slurry, the mass ratio of calcined sl...

Embodiment 3

[0063] In this embodiment, a refractory gold mine in Anhui is selected. Gold is wrapped in sulfide, and its main components are gold 65.9g / t, iron 19.1%, sulfur 20.2%, and carbon 1.7%. The specific operating steps and process parameters adopted in this example are as follows: get 100 grams of this refractory gold ore to be crushed, ball milled, and the particle size is less than 0.074mm, accounting for 50%, and placed in a heating furnace to feed a mixture of hydrogen and natural gas (both volume ratio 1:1) for calcination, the calcination temperature is controlled at 750°C, and the calcination time is 2 hours. The soot generated by roasting is cooled to obtain products such as hydrogen sulfide. Add ore particle grinding media with a mass ratio of 20:1 to the roasted slag, and then add acid iron solution containing 100g / L nitric acid and 200g / L ferric chloride to adjust the slurry, the mass ratio of roasted slag and acid iron solution The ratio is 1:10, and the slurry is adju...

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Abstract

The invention relates to a grinding and leaching pretreatment process of refractory gold ore. The process is mainly used for combined pretreatment of anaerobic roasting and mechanical activated leaching on the refractory gold ore. The process specifically comprises the following steps that S1, the gold ore is broken, and subjected to ball milling and powdering, and gold ore powder is obtained; S2,the obtained gold ore powder is placed in gas atmosphere without oxygen or vacuum to be roasted, and after roasting, roasting slag and smoke are obtained; S3, the roasting slag is subjected to grinding and pulp mixing, slurry is placed in a reaction kettle to be subjected to temperature control and stirring leaching, and a base metal leaching agent and leaching slag are obtained; S4, the leachingslag is subjected to desulfuration purification; S5, a gold lixiviant is used for carrying out gold extraction on purifying slag. The advantages of a roasting method and a mechanical activated leaching method are combined, and the beneficial effects of being high in raw material adaptability, gentle in operation condition, low in equipment requirement, obvious in environment and economic benefitand the like are achieved.

Description

technical field [0001] The invention relates to a grinding and leaching pretreatment process for refractory gold ore, belonging to the technical field of gold extraction. Background technique [0002] At present, refractory gold ore has become the main raw material for gold production. The gold particles in this type of ore are often wrapped by sulfides such as arsenopyrite and pyrite, and contain more impurity elements, such as sulfur, arsenic, antimony, copper, etc. and carbon etc. Using the traditional direct cyanide leaching process, the gold leaching rate is low and the consumption of cyanide is large. For this type of gold ore treatment, it is necessary to pre-treat the ore before cyanidation gold leaching to decompose the gold-coated ore and expose the gold so that the gold can be directly contacted with cyanide in the subsequent cyanide gold extraction process. A reaction occurs, thereby increasing the gold leaching rate. [0003] At present, the commonly used pre...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B11/00C01B17/64
CPCC01B17/64C22B1/02C22B11/04Y02P10/20
Inventor 陈国宝路远航张新明
Owner NORTHEASTERN UNIV
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