A hydrometallurgical process for refractory gold-bearing arsenosulfide concentrates at ambient temperature and pressure was presented, including fine grinding with intensified alkali-leaching (FGIAL), enhanced agita...A hydrometallurgical process for refractory gold-bearing arsenosulfide concentrates at ambient temperature and pressure was presented, including fine grinding with intensified alkali-leaching (FGIAL), enhanced agitation alkali-leaching (EAAL), thiosulfate leaching and displacement. Experimental results on a refractory gold concentrate showed that the total consumption of NaOH in alkaline leaching is only 41% of those theoretically calculated under the conditions of full oxidization for the same amount of arse- nides and sulfides transformed into arsenates and sulfates, and 72.3% of gold is synchro-dissoluted by thiosulfate self-generated during alkaline leaching. After alkaline leaching, thiosulfate leaching was carried out for 24 h. The dissolution of gold is increased to 91.9% from 4.6% by cyanide without the pretreatment. The displacement of gold by zinc powder in the solution gets to 99.2%. Due to an amount of thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal.展开更多
The thiourea leaching of gold from the calcine of gold-bearing arsenical pyrite concentrate of Kangjiawan mine was studied.The effects of the leaching time,the concentrations of thiourea,hydrochloric acid and initial ...The thiourea leaching of gold from the calcine of gold-bearing arsenical pyrite concentrate of Kangjiawan mine was studied.The effects of the leaching time,the concentrations of thiourea,hydrochloric acid and initial ferric ion on the leaching recovery of gold were investigated,and a regressive model has been established,which showed that the concentrations of thiourea and hydrochloric acid were the most important factors,leaching time the second,and concentration of the initial ferric ion the least・Under the optimal conditions,that is,temperature 50℃,the ratio of liquid to solid 4:1,thiourea 12g/L,hydrochloric acid 1 mol/L,and initial ferric ion 1 g/L,the leaching recoveries of gold and silver were more than 81%and 73%,respectively.The increase of silver recovery and the reduction of thiourea consumption could be attained when sodium sulphite was added.展开更多
The mineralogical characterization of antimony-bearing refractory gold concentrates and the antimony extraction by ozonein HCl solution were investigated.The mineralogical study shows that there exist stibnite(Sb2S3),...The mineralogical characterization of antimony-bearing refractory gold concentrates and the antimony extraction by ozonein HCl solution were investigated.The mineralogical study shows that there exist stibnite(Sb2S3),arsenopyrite(FeAsS),pyrite(FeS2)and quartz in the concentrates,and the gold is mainly(67.42%)encapsulated in sulfides.The antimony extraction by ozone inhydrochloric acid was employed and the influences of temperature,liquid/solid ratio,HCl concentration and stirring speed on theextraction of antimony were investigated.High antimony extraction(93.75%)is achieved under the optimized conditions.After thepretreatment by ozone,the antimony is recovered efficiently and the gold is enriched in the leaching residue.展开更多
以锑金精矿与铅精矿为研究对象,采用热力学软件FactSage计算协同熔炼过程各金属硫化物反应趋势、Me-S-O系优势区图及物相平衡分配规律。热力学分析表明,控制适宜的氧分压和硫分压可实现协同熔炼过程处在Pb(l)+Sb(l)热力学稳定区域,协同...以锑金精矿与铅精矿为研究对象,采用热力学软件FactSage计算协同熔炼过程各金属硫化物反应趋势、Me-S-O系优势区图及物相平衡分配规律。热力学分析表明,控制适宜的氧分压和硫分压可实现协同熔炼过程处在Pb(l)+Sb(l)热力学稳定区域,协同熔炼过程Sb_(2)O_(5)与PbS发生交互反应生成金属Pb、Sb的趋势较大,有利于实现熔炼过程Sb的回收和Au的捕集。验证试验表明,在熔炼温度1200℃、CaO SiO_(2)=0.40、Fe SiO_(2)=1.05、富氧浓度90%的条件下,锑金精矿与铅精矿协同熔炼过程可顺利进行,合金中Pb、Sb收率均大于88%,渣中Pb、Sb含量均小于1%,合金中Au含量达78 g t。展开更多
基金This project was financially supported by the Natural Science Foundation of Liaoning Province of China (No.2001101015) and theFree Study Item of the Institute of Metal Research, Chinese Academy of Sciences (No.AM05-0866)
文摘A hydrometallurgical process for refractory gold-bearing arsenosulfide concentrates at ambient temperature and pressure was presented, including fine grinding with intensified alkali-leaching (FGIAL), enhanced agitation alkali-leaching (EAAL), thiosulfate leaching and displacement. Experimental results on a refractory gold concentrate showed that the total consumption of NaOH in alkaline leaching is only 41% of those theoretically calculated under the conditions of full oxidization for the same amount of arse- nides and sulfides transformed into arsenates and sulfates, and 72.3% of gold is synchro-dissoluted by thiosulfate self-generated during alkaline leaching. After alkaline leaching, thiosulfate leaching was carried out for 24 h. The dissolution of gold is increased to 91.9% from 4.6% by cyanide without the pretreatment. The displacement of gold by zinc powder in the solution gets to 99.2%. Due to an amount of thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal.
文摘The thiourea leaching of gold from the calcine of gold-bearing arsenical pyrite concentrate of Kangjiawan mine was studied.The effects of the leaching time,the concentrations of thiourea,hydrochloric acid and initial ferric ion on the leaching recovery of gold were investigated,and a regressive model has been established,which showed that the concentrations of thiourea and hydrochloric acid were the most important factors,leaching time the second,and concentration of the initial ferric ion the least・Under the optimal conditions,that is,temperature 50℃,the ratio of liquid to solid 4:1,thiourea 12g/L,hydrochloric acid 1 mol/L,and initial ferric ion 1 g/L,the leaching recoveries of gold and silver were more than 81%and 73%,respectively.The increase of silver recovery and the reduction of thiourea consumption could be attained when sodium sulphite was added.
基金Project(51474257) supported by the National Natural Science Foundation of ChinaProject(2015zzts037) supported by the Postgraduate Research and Innovation Projects of Hunan province,ChinaProject(2015JC3005) supported by the Key Technology Research and Development Program of Hunan Province,China
文摘The mineralogical characterization of antimony-bearing refractory gold concentrates and the antimony extraction by ozonein HCl solution were investigated.The mineralogical study shows that there exist stibnite(Sb2S3),arsenopyrite(FeAsS),pyrite(FeS2)and quartz in the concentrates,and the gold is mainly(67.42%)encapsulated in sulfides.The antimony extraction by ozone inhydrochloric acid was employed and the influences of temperature,liquid/solid ratio,HCl concentration and stirring speed on theextraction of antimony were investigated.High antimony extraction(93.75%)is achieved under the optimized conditions.After thepretreatment by ozone,the antimony is recovered efficiently and the gold is enriched in the leaching residue.
文摘以锑金精矿与铅精矿为研究对象,采用热力学软件FactSage计算协同熔炼过程各金属硫化物反应趋势、Me-S-O系优势区图及物相平衡分配规律。热力学分析表明,控制适宜的氧分压和硫分压可实现协同熔炼过程处在Pb(l)+Sb(l)热力学稳定区域,协同熔炼过程Sb_(2)O_(5)与PbS发生交互反应生成金属Pb、Sb的趋势较大,有利于实现熔炼过程Sb的回收和Au的捕集。验证试验表明,在熔炼温度1200℃、CaO SiO_(2)=0.40、Fe SiO_(2)=1.05、富氧浓度90%的条件下,锑金精矿与铅精矿协同熔炼过程可顺利进行,合金中Pb、Sb收率均大于88%,渣中Pb、Sb含量均小于1%,合金中Au含量达78 g t。