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Method for leaching sulfide gold concentrate by virtue of combination of acid pressure leaching and alkali pressure leaching

A technology of oxygen pressure acid leaching and oxygen pressure alkali leaching, which is applied in the field of oxygen pressure acid leaching and oxygen pressure alkali leaching combined to leaching gold from sulfide gold concentrate, which can solve the problems of high cost and large amount of thiosulfate , to achieve the effects of low production cost, environmental friendliness and high gold leaching rate

Inactive Publication Date: 2015-07-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after long-term research, it is found that there is a problem of high cost due to the large amount of thiosulfate used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: adopt oxygen pressure acid leaching pretreatment-oxygen pressure alkali leaching process. The oxygen pressure acid leaching conditions are: feed fineness -0.045mm accounts for 90%, reaction temperature 140°C, oxygen partial pressure 1.0MPa, reaction time 3h, liquid-solid mass ratio 4, initial H 2 SO 4 The concentration is 145g / L, and the stirring intensity is 700r / min. Under these conditions 61% of the elemental sulfur in the gold concentrate was converted to sulfur. Oxygen pressure alkali leaching conditions are: the amount of calcium oxide added is 50Kg / t 金精矿 , the reaction temperature is 90°C, the oxygen partial pressure is 0.30MPa, the liquid-solid mass ratio is 4, the time is 6h, and the stirring intensity is 650r / min. Under these conditions, the leaching rate of gold is 85.8%.

Embodiment 2

[0026] Embodiment 2: adopt oxygen pressure acid leaching pretreatment-oxygen pressure alkali leaching process. The oxygen pressure acid leaching conditions are as follows: feed fineness -0.045mm accounts for 90%, reaction temperature 150°C, oxygen partial pressure 1.2MPa, reaction time 3h, liquid-solid mass ratio 4, initial H 2 SO 4 The concentration is 145g / L, and the stirring intensity is 700r / min. Under these conditions 56% of the elemental sulfur in the gold concentrate was converted to sulfur. Oxygen pressure alkali leaching conditions are: the amount of calcium hydroxide added is 150Kg / t 金精矿 , Reaction temperature 100°C oxygen partial pressure 0.35MPa, liquid-solid mass ratio 4, time 6h, stirring intensity 650r / min. Under these conditions, the leaching rate of gold is 86.3%.

Embodiment 3

[0027] Embodiment 3: adopt oxygen pressure acid leaching pretreatment-oxygen pressure alkali leaching process. The oxygen pressure acid leaching conditions are as follows: feed fineness -0.045mm accounts for 90%, reaction temperature 160°C, oxygen partial pressure 1.4MPa, reaction time 3h, liquid-solid mass ratio 4, initial H 2 SO 4 The concentration is 145g / L, and the stirring intensity is 700r / min. Under these conditions 51% of the elemental sulfur in the gold concentrate was converted to sulphur. Oxygen pressure alkali leaching conditions are: the amount of sodium hydroxide added is 200Kg / t 金精矿 , Reaction temperature 110°C oxygen partial pressure 0.40MPa, liquid-solid mass ratio 4, time 6h, stirring intensity 650r / min. Under these conditions, the leaching rate of gold is 85.5%.

[0028] Raw material condition 2: The multi-element analysis and gold phase analysis of a certain gold concentrate are shown in Table 3 and Table 4:

[0029] Table 3 Multi-element analysis of g...

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Abstract

The invention relates to a method for leaching sulfide gold concentrate by virtue of combination of acid pressure leaching and alkali pressure leaching. The method comprises an acid pressure leaching pretreatment stage and an alkali pressure leaching stage; firstly, in an acid pressure leaching process, reaction conditions are controlled, so that sulfides are oxidized, part of elemental sulfur is converted into a simple substance sulphur and thus gold is dissociated and exposed. Acid pressure leaching residues are subjected to alkali pressure leaching stage after being washed; in the alkali leaching process, the dosage of alkali substances is controlled, and the reaction temperature and the oxygen partial pressure are kept at a relatively low level, so that the sulphur in the acid pressure leaching residues is oxidized into ligands, namely thiosulfate ions and polysulfide ions, which are coordinated with gold, so that efficient gold leaching is realized under a condition of no additional leaching agent. The method is environmentally friendly and low in production cost.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for leaching gold from sulfide gold concentrates in combination with oxygen pressure acid leaching and oxygen pressure alkali leaching. Background technique [0002] With the increasing depletion of easy-to-handle gold mines, difficult-to-handle gold mines have become an important resource for gold production. Sulfide gold ore is the most common refractory gold ore, in which gold is often coated with sulfide such as pyrite and arsenopyrite in the form of fine particles. Sulfide gold ore generally needs to be enriched by flotation before leaching, so as to improve the grade of gold in the raw material and reduce the treatment capacity. The gold concentrate obtained by flotation must also undergo oxidation pretreatment to increase the exposure of gold. At present, the domestic pretreatment method is mainly oxidative roasting, which easily leads to the "secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B3/08C22B3/12C22B11/00
CPCY02P10/20
Inventor 杨永斌徐斌李骞姜涛周思洁刘诗倩李光辉郭宇峰陈许玲范晓慧黄柱成张元波许斌彭志伟甘敏
Owner CENT SOUTH UNIV
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