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A kind of pretreatment method of silver-gold ore containing manganese

A silver-gold ore and pretreatment technology, which is applied in the direction of improving process efficiency, can solve the problems of HCN precipitation, dangerous accidents, and great influence of cyanide leaching, and achieves low cost, improved cyanide leaching rate, and simple process. Effect

Active Publication Date: 2016-08-17
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the above method is an acidic system, the acid in the leaching slag has a great influence on the subsequent cyanide leaching, which is likely to cause the precipitation of HCN and dangerous accidents, so cyanide enterprises rarely use acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Get 150g of manganese-containing silver-gold ore shown in Table 1, mix 300g of ammonia-ammonium chloride mixed solution with manganese-containing silver-gold ore with ammonium ion concentration of 6mol / L and ammonia concentration of 0.2mol / L, add metallic copper Silk 0.2g, stirring and leaching after 4 hours, solid-liquid separation, obtained leachate and leaching slag, after analyzing 30% manganese enters in leaching solution, gold, iron are not leached; Add leaching slag and 450g water in the cyanide leaching tank, use After the lime slurry is adjusted to a pH of about 10, NaCN is added, and the amount of NaCN is 3kg / t to treat the ore sample. After cyanide leaching for 36 hours, sampling analysis shows that the silver cyanide leaching rate is 50%, and the gold cyanide leaching rate is 91%; Compared with the comparative example, the silver leaching rate increased by 22%.

Embodiment 2

[0019] Get 150g of manganese-containing silver-gold ore shown in Table 1, mix 750g of ammonia-ammonium chloride mixed solution with manganese-containing silver-gold ore with ammonium ion concentration of 6mol / L and ammonia concentration of 6mol / L, and add metal copper wire 6g, after stirring and leaching for 8 hours, the solid-liquid separation was carried out to obtain the leach solution and the leaching residue. After analysis, 60% of the manganese entered the leach solution, and the gold and iron were not leached; After the slurry reaches a pH of about 10, NaCN is added, and the amount of NaCN is 3kg / t to treat the ore sample. After cyanide leaching for 36 hours, sampling analysis shows that the silver leaching rate is 83%, and the gold cyanide leaching rate is 93%; compared with the comparative example , Silver leaching rate increased by 55%.

Embodiment 3

[0021] Get 150g of manganese-containing silver-gold ore shown in Table 1, mix 1500g of ammonia-ammonium sulfate mixed solution with manganese-containing silver-gold ore with ammonium ion concentration of 3mol / L and ammonia concentration of 6mol / L, and add 15g of metal copper wire , after stirring and leaching for 20 hours, the solid-liquid separation was carried out to obtain leachate and leaching slag. After analysis, 62% of manganese entered the leachate, and gold and iron were not leached; the leaching slag and 450g of water were added to the cyanide leaching tank, and the slurry was mixed with lime When the pH is about 10, NaCN is added, and the amount of NaCN is 3kg / t to treat the ore sample. After cyanide leaching for 36 hours, sampling analysis shows that the silver leaching rate is 85%, and the gold cyanide leaching rate is 93%. Compared with the comparative example, The silver leaching rate increased by 57%.

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Abstract

The invention discloses a pretreatment method for manganese-containing electrum. The pretreatment method is characterized by comprising the following steps: mixing a mixed solution of ammonia water and ammonium salt with manganese-containing electrum according to a mass ratio of (2-10) to1, adding metal copper according to a mass ratio of metal copper to manganese-containing electrum being (0.1-10) to100, performing leaching under agitation for 2-20 hours, performing solid-liquid separation, thereby obtaining a leaching agent and leaching slag, and performing cyanide leaching on the leaching slag, thereby obtaining silver and gold. By adopting the method disclosed by the invention, the manganese-containing electrum can be further pretreated, the silver mineral can be dissociated from the manganese mineral, and thus later cyanide leaching is facilitated. The pretreatment method is simple in process and low in cost, and the cyanide leaching rate of silver is greatly increased.

Description

technical field [0001] The invention relates to a pretreatment method of manganese-containing silver-gold ore. Background technique [0002] At present, the cyanidation method is still the main method for extracting gold and silver from fine-grained gold ore. The advantage of the cyanidation method is that the process is mature, the gold and silver extraction rate is high, and the adaptability to ore is strong. When extracting gold and silver from gold-bearing ores and concentrates by cyanidation, certain non-precious metal minerals contained in them will react with cyanide, increasing solvent consumption; Solid solution reduces the leaching rate of gold and silver, so pretreatment is required. [0003] At present, many manganese-silver symbiotic deposits have been discovered at home and abroad. The manganese in the ore is mainly oxidized minerals such as pyrolusite and duromanganese, and the main form is MnO. 2 ; Its associated silver minerals are mainly in the form of f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/14C22B11/08
CPCY02P10/20
Inventor 邱显扬刘志强李伟朱薇黄清源何斌
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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