Study On Thiourea-Ammonium Thiocyanate Leaching From Fine Disseminated Gold Mines
Keywords
Fine Disseminated Gold Ore, Thiourea, Ammonium Thiocyanate, Leaching
Abstract
The chemical analysis results of a certain fine disseminated gold ore show that the gold grade is 3.51×10-6, the SiO2 content is high (71.88%), and the organic carbon mass fraction is as high as 2.51%. XRD and gold phase analysis show that the main minerals in the ore are Quartz, calcite and sulfide ores, gold ores are mainly fine-grained disseminated types, or wrapped in quartz, silicate, sulfide ores and carbonate minerals. When leaching with a single system of roasting-thiourea or ammonium thiocyanate, the gold leaching rate is low; when leaching with a mixed system of roasting-thiourea and ammonium thiocyanate, a better leaching rate can be obtained. The effects of ammonium thiocyanate, thiourea (Tu) and iron sulfate on gold leaching were studied through factorial experiments. The results showed that iron sulfate and ammonium thiocyanate interacted significantly. By optimizing the leaching time, pH value and liquid-to-solid ratio, optimal conditions for gold leaching in the mixed system were obtained. The results show that when the roasting temperature is 600℃, the roasting time is 60min, pH=1.06, the dosage of iron sulfate is 14kg/t, the dosage of ammonium thiocyanate is 10kg/t, the dosage of thiourea is 2kg/t, the leaching time is 7h and the liquid Under the condition that the solid ratio is 3:1, a gold leaching rate of 75.03% can be obtained.
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Originate research is done by Tang Lijing, Tang Yun, Li Jiaojiao, Yang Dianqi DOI: 10.11872/j.issn.1005-2518.2015.04.097, PP. 97-101
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