Recovery of gold from arsenopyrite with the Arseno method
Co. Arseno hydrometallurgical process to develop a process for recovering gold from arsenopyrite iron ore. This new process eliminates the need for roasting arsenopyrite operations prior to gold extraction. Process Description The process has three main steps, namely concentrate leaching, which recovers gold and arsenic precipitation. 1 , concentrate leaching In concentrate leaching operations, arsenopyrite and other sulfide ore are decomposed in a stainless steel autoclave under aerobic pressure. The leaching speed is fast and the entire decomposition process is completed within 15 minutes without any re-generation of arsenic pyrite. All gold, elemental sulfur and insoluble silicate minerals remain in the leaching residue. Among all the sulfide ore that is symbiotic with arsenopyrite, pyrite is the most. In the deposit, a large amount of useless pyrite often symbiotics with gold-containing arsenopyrite. These two minerals must be selected before leaching in order to reduce unnecessary consumption of chemicals and reduce production costs. This has been achieved by flotation. 2 , sorting pyrite An important feature of this new process is the successful separation of pyrite from arsenopyrite by flotation. Pyrite (often containing little gold) participates in the process and does not consume chemicals. This separation method, which has proven to be difficult in the past, will allow many deposits that have not been treated by conventional methods to be utilized. 3 , recovery gold After the residue is subjected to caustic pretreatment, gold is recovered therefrom by a conventional cyanidation method. 4 , precipitation of arsenic The leachate contains dissolved arsenic, iron and sulfur. The solution was partially neutralized and then heated in a stainless steel autoclave to make it safe to iron arsenate, hematite and gypsum . These solids can be completely deposited in the tailings pond. There is a possibility of producing arsenic trioxide, but the market for this product has not yet been determined. Economic benefits of the process Investment and production costs are estimated based on laboratory test data and are prepared for a plant in Central South of British Columbia. These cost estimates are made for a daily processing capacity of 15 tons of wet arsenopyrite concentrate factory. The composition of the wet arsenic pyrite concentrate is as follows; ( 1 ) 10 tons / day arsenic pyrite, ( 2 ) 2 tons / day pyrite, ( 3 ) 1.3 tons / day gangue, ( 4 ) 1.7 tons / Daily water.    Capital costs (with 1983 first quarter as the base) to 4, 750, 000 Canadian dollars. Production costs are estimated at C $ 420 / ton, including: ( 1 ) Drug consumption     188 Canadian dollars / ton ( 45% ) ( 2 ) Labor costs     106 Canadian dollars / ton ( 25% ) ( 3 ) Energy costs     10 Canadian dollars / ton ( 2% ) ( 4 ) Indirect costs     118 Canadian dollars / ton ( 28% )
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