Electrochemical leaching of gold-arsenic concentrates (1)

At present, it is an urgent task for the gold industry to seek and develop a reasonable gold - arsenic concentrate treatment technology. The authors studied the electrochemical oxidation leaching method with gold-containing sulfide concentrates. The purpose was to fully dissociate and expose the fine-grained dispersion gold in the sulfide, and then recover it by cyanidation. Gold - arsenic concentrates were tested in caustic soda solution by electrochemical leaching under laboratory conditions .

Three concentrates were selected belong to the same mine, but the content of the concentrate pyrite and arsenopyrite vary.

Concentrate Â Â Â Pyrite content % , Â Â Â Arsenic pyrite content, %

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â I Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 36.3 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 18.3

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â II Â Â Â Â Â Â Â Â 15.6 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 10.7

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â III Â Â Â Â Â Â Â Â Â 5 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 8.3

Gold is mainly attached to two minerals, but the gold content in arsenopyrite is higher than that of pyrite.

All concentrates are refractory concentrates in terms of processing technology. This can be demonstrated by the phase analysis of the gold in the concentrate (see Table 1 ). According firing - chemically treating with an acid or a base calcine - when the process concentrate residue was treated cyanide, cyanide tailings gold concentrate containing 4 to I 5 grams / ton, while the gold content of the cyanide tailings of concentrate II and concentrate III is not less than 9~ 9.4 grams / ton.

Electrochemical leaching test is in volume 1 liter The special structure of the electrolysis cell is carried out. A separate leaching unit is used for each concentrate. Weighing during the test 100 grams Material, the original concentration of caustic soda is 100 grams / liter, the solution temperature is 70 Â°C .

According to the research results, for the concentrate I with the highest sulfide content , the best leaching conditions for the gold content in the tailings after the subsequent cyanidation are: liquid: solid = 10 : 1 , current volume The density is 8.3 amps / liter and the leaching time is 8 hours. The optimum leaching conditions for concentrate II and concentrate III are: liquid: solid; 5 : 1 , current bulk density is 5 amps / liter. Concentrate II has a leaching time of 8 hours and concentrate III is 6 hours.

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