For the gold-containing arsenic, pyrite concentrate dissociation of disseminated gold to cyanide Next, in recent years many new hydrometallurgical method. From the environmental point of view, it is reasonable to adopt these methods, but in addition to the process effects, these methods have many serious shortcomings. Mechanical crushing with planetary gear mills and jet mills is one of the promising processes in this area. In the ultra-fine grinding, the dissociation ability of the gold-containing sulfide minerals can be improved, and the decomposition of the gold mineral can be realized under the condition that the conditions are not strict, the chemical consumption is moderate, and the equipment shape is simple.
The raw material used in this test is one of the concentrates of Yakutia, and the concentrate is finely ground and then treated by hydrometallurgy. Use
Grinding is injected with MCII-05 and MCII-005 type mill. Using compressed air as the energy carrier, the gauge pressure is 0.45~0.50 MIIa , consumption
The rotation speed of the classifier rotor is increased from 20 to
The sulfide minerals in the concentrates in the above-mentioned size range are characterized by high chemical activity (and  The original mineral is 9-15 times higher than that of the original mineral , and it can be decomposed with sodium hydroxide solution at normal temperature and normal pressure. Under these conditions, mainly in the form of arsenate arsenic ions into the solution, and sulfur - in the form of sulfate and thiosulfate ions into solution. Under the optimal conditions, arsenic pyrite is decomposed by 80-85% and pyrite is -40~45% .
After mechanical crushing, the adsorption capacity of the pulverized mineral composite is increased.
In order to suppress secondary adsorption of Au and As , adsorption leaching must be carried out using an AM-26 type anion exchanger ( 8.05% ). The recovery of precious metals during cyanidation depends on the pre-alkali treatment time (Ï„)). If you increase this time from 12d to 48 hours,
In the case where other conditions are also ideal: liquid: solid = 6 : 1 , sodium oxygen oxide concentration is
Recovery of gold and silver from concentrates treated in different ways
At    Rational    square    law | Remaining content g / ton | Recovery rate % | ||
Au | Ag | Au | Ag | |
Adsorption cyanidation of grinding ore concentrates, jet grinding concentrate, alkali leaching, cyanidation | 12.50 | 76.00 | 77.30 | 91.30 |
-6 micron size, 90% | 6.10 | 10.00 | 88.90 | 96.20 |
-15 micron size, 90% | 5.80 | 8.00 | 89.50 | 97.00 |
Feeding ore size 70%-74 microns | 17.60 | 100.00 | 68.00 | 62.50 |
As can be seen from the table, the index of adsorption cyanidation of concentrates depends on the pre-alkali treatment scheme. When the spray process is combined with the leaching of sodium hydroxide solution (according to Table 1 ), the highest recovery of the precious metal is ensured. At this time, the recovery rate of gold was 88.9% and silver was 96.2% . Jet milling adsorbed cyanide ore concentrates, in the absence of pre alkali leaching, Au recovery rate of not more than 77.3%, As 71.3%, the content of leaching residue were 12.15 and
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