Non-cyanide leaching agent and method for gold mine leaching thereof

A leaching agent, non-cyanide technology, applied in the field of non-cyanide extraction of gold ore, can solve the problems of small range of applicable ore samples, strong acidity of the leaching agent, instability of the leaching agent, etc., to achieve favorable leaching effect, high leaching pH, pH Wide range of effects

Active Publication Date: 2017-12-05
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can quickly and low-cost leaching gold and silver in sulfur-arsenic gold ore, but the leaching agent is highly acidic, and the acid consumption is high, which is easy to caus

Method used

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  • Non-cyanide leaching agent and method for gold mine leaching thereof
  • Non-cyanide leaching agent and method for gold mine leaching thereof
  • Non-cyanide leaching agent and method for gold mine leaching thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 non-cyanide leaching agent and gold ore leaching

[0043] Mix ammonium thiocyanate, thiourea, thiocyanate and ammonium cyanate in a molar ratio of 6:1:2:1 to prepare a non-cyanide leaching agent.

[0044] The gold mineral in this embodiment is sulfide ore flotation gold concentrate, the gold ore contains 9.206%, 12.694%, and 2.7% of sulfur, iron, and arsenic respectively, and the gold grade is 98.34g / t, which is a high-sulfur and high-arsenic gold ore . Phase analysis shows that the metal minerals are 42.71% pyrite, 1.26% rutile, 5.62% arsenopyrite, and trace amounts of chalcopyrite, sphalerite and gold minerals. The gangue minerals are mainly quartz and feldspar, of which the quartz mineral content is 45.19%, and the feldspar content is 3.59%. In addition, the gangue minerals also contain a small amount of sericite and chlorite.

[0045] Take 50g of the above-mentioned refractory gold concentrate into a crucible, roast it in a muffle furnace at 750°C for...

Embodiment 2

[0048] Embodiment 2 non-cyanide leaching agent and gold ore leaching

[0049] Mix ammonium thiocyanate, thiourea, thiocyanate and ammonium cyanate in a molar ratio of 5:1:3:1 to prepare a non-cyanide leaching agent.

[0050] The gold mineral in this embodiment is sulfide ore flotation gold concentrate, the gold ore contains 16.29% sulfur and 26.694% iron respectively, and the gold grade is 64.79g / t, which is sulfide ore gold ore. Phase analysis shows that the metal minerals are mainly 51.31% pyrite, and trace amounts of chalcopyrite, galena and sphalerite. The gangue minerals are mainly quartz and feldspar, of which the quartz mineral content is 42.38%, and the feldspar content is 4.03%. In addition, the gangue minerals also contain a small amount of mica.

[0051] Take 200g of the above-mentioned refractory gold concentrate into a crucible, roast it in a muffle furnace at 700°C for 1 hour, and then take it out after cooling. The roasted ore was milled in a ball mill with wa...

Embodiment 3

[0054] Embodiment 3 non-cyanide leaching agent and gold ore leaching

[0055] Mix potassium thiocyanate, thiourea, thiocyanate and sodium cyanate in a molar ratio of 8:0.5:0.5:1 to prepare a non-cyanide leaching agent.

[0056] The gold minerals in this embodiment are sulfide ore flotation gold concentrates, and the main metal minerals in the ore are pyrite, arsenopyrite and a small amount of galena, sphalerite and chalcopyrite. Non-metallic minerals are quartz, chlorite, calcite and a small amount of garnet, fluorite, muscovite and so on. The main chemical composition of gangue minerals in the ore is SiO 2 , CaO, Al 2 o 3 , The content is 47.28%, 6.72%, 5.81%. The main elements of metal minerals are TFe, S, As, the element content is 11.45%, 7.41%, 2.45%, and the original ore is arsenic-containing sulfide ore gold ore.

[0057] Take 500g of the above-mentioned refractory gold concentrate and put it into a porcelain bowl, roast it in a muffle furnace at 650°C for 2 hours,...

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Abstract

Disclosed is a non-cyanide leaching agent. The non-cyanide leaching agent comprises thiocyanate, thiourea, thiocyanogen and cyanate. The molar ratio of each component is 4-8:0.5-1:0.5-3:1-2. The non-cyanide leaching agent has the advantages of being high in leaching rate, high in leaching speed, stable in performance, wide in applicable range, low in cost, high in adaptive capacity to environment and simple and convenient in technology, and the leaching rate of gold in sulfuration gold mine with high sulfur and high arsenic and difficult to process is improved to above 96%.

Description

technical field [0001] The invention relates to the field of gold ore extraction by a non-cyanide method, in particular to a non-cyanide leaching agent and a method for leaching gold ore. Background technique [0002] With the depletion of resources and the gradual expansion of industrial demand, the recovery of gold mines is becoming more and more difficult. The recovery of gold from refractory gold mines has been paid more attention and has become the main raw material for extracting gold. Leaching is the main means of recovering refractory gold ores, and the cyanidation method has become the main means of gold extraction due to its mature technology, wide adaptability, stable indicators, simple operation, high leaching efficiency, and good economic benefits. However, the cyanidation method is easily affected by impurity minerals, and the leaching time is long. At the same time, the severe toxicity of cyanide leaching agent has brought great harm to the environment and st...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/08
CPCC22B3/08C22B11/04Y02P10/20
Inventor 黄万抚吴浩李新冬
Owner JIANGXI UNIV OF SCI & TECH
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