A novel fluidized bed reactor was designed and installed for bioleaching in a semi continuous way, by which a process for bioleaching cyanidation of Jinya refractory gold arsenical concentrate was studied. The arsenic...A novel fluidized bed reactor was designed and installed for bioleaching in a semi continuous way, by which a process for bioleaching cyanidation of Jinya refractory gold arsenical concentrate was studied. The arsenic extraction rate reaches 82.5% after 4 day batch biooxidation of the concentrate under the optimized condition of pH 2.0, ferric ion concentration 6.5?g/L and pulp concentration 10%. And leached rate of gold in the following cyanidation is over 90%. The parameters of three series fluidized bed reactors exhibit stability during the semi continuous bioleaching of the concentrate. Arsenic in the concentrate can be got rid of 91% after 6 day leaching. Even after 4 days, 82% of arsenic extraction rate was still obtained. The recovery rates of gold are 92% and 87.5% respectively in cyaniding the above bioleached residues. The results will provide a base for further commercial production of gold development.展开更多
Geological and geochemical studies and experiments on mineralization indicate that the source bed of the La' erma gold deposit in the south subbelt of the western Qinling Mountains is hydrothermal cherts in the Ca...Geological and geochemical studies and experiments on mineralization indicate that the source bed of the La' erma gold deposit in the south subbelt of the western Qinling Mountains is hydrothermal cherts in the Cambrian Taiyangding Group. Organic geochemical study of the cherts shows that the organic precursors intimately associated with gold are marine bacteria and algae. The gold content in chert,is positively correlated with the amount of bacterial and algal microfossils, and simulation experiments on biomineralization of modern bacteria and algae indicate that bacteria and algae played an important role in the formation of the La' erma gold deposit.展开更多
There are three types of gold deposits in the Jiaodong gold metallogenetic domain. The strata\|bound gold deposits are a new type, which occur in a hydrocarbon\|gold double\|source bed enriched in gold (Au 174 ng/g) a...There are three types of gold deposits in the Jiaodong gold metallogenetic domain. The strata\|bound gold deposits are a new type, which occur in a hydrocarbon\|gold double\|source bed enriched in gold (Au 174 ng/g) and organic carbon (0.007%-4.225%). At diagenetic and hydrothermal stages water and oil were simultaneously activated and the strata\|bound gold deposits were formed from interactions between water, oil and rocks. In the late Yanshanian period, gold orebodies were enriched and enlarged in response to tectonomagmatism and action of complex ore\|forming hydrothermal solutions. As a result, it is highly expected to find suparlarge gold deposits and the Yanzi area is expected to be a perspective target area.展开更多
The results have demonstrated that the studying area underwent four stages of geotectonie evolution,namely, pre-geosyneline, geosyneline, platform and diwa stages. The gold deposits were formed during diwa stage of th...The results have demonstrated that the studying area underwent four stages of geotectonie evolution,namely, pre-geosyneline, geosyneline, platform and diwa stages. The gold deposits were formed during diwa stage of the iste Yanshanian Age, undergoing multi-tectono-magmatic activities. Jiaodong Group of the Upper Archean Erathem was the source bed of gold deposits. Granitie msamatic aetivities dived the ore-forming elements transporting. Tectonic activities controlled the formation, the distribution of gold deposits and the scale and the shape of ore body, ete.. The gold deposits exhibit the eharacteristics multi-source of ore-forming elemcnts, multi-genesis, multi-ote-conttolling foctors, multi-genstical types and multi-stage mineralization. They belong to mantle-erust deposits.展开更多
文摘A novel fluidized bed reactor was designed and installed for bioleaching in a semi continuous way, by which a process for bioleaching cyanidation of Jinya refractory gold arsenical concentrate was studied. The arsenic extraction rate reaches 82.5% after 4 day batch biooxidation of the concentrate under the optimized condition of pH 2.0, ferric ion concentration 6.5?g/L and pulp concentration 10%. And leached rate of gold in the following cyanidation is over 90%. The parameters of three series fluidized bed reactors exhibit stability during the semi continuous bioleaching of the concentrate. Arsenic in the concentrate can be got rid of 91% after 6 day leaching. Even after 4 days, 82% of arsenic extraction rate was still obtained. The recovery rates of gold are 92% and 87.5% respectively in cyaniding the above bioleached residues. The results will provide a base for further commercial production of gold development.
基金This research was supported by the Youth Foundation of National Natural Science of China grant 49503048.
文摘Geological and geochemical studies and experiments on mineralization indicate that the source bed of the La' erma gold deposit in the south subbelt of the western Qinling Mountains is hydrothermal cherts in the Cambrian Taiyangding Group. Organic geochemical study of the cherts shows that the organic precursors intimately associated with gold are marine bacteria and algae. The gold content in chert,is positively correlated with the amount of bacterial and algal microfossils, and simulation experiments on biomineralization of modern bacteria and algae indicate that bacteria and algae played an important role in the formation of the La' erma gold deposit.
文摘There are three types of gold deposits in the Jiaodong gold metallogenetic domain. The strata\|bound gold deposits are a new type, which occur in a hydrocarbon\|gold double\|source bed enriched in gold (Au 174 ng/g) and organic carbon (0.007%-4.225%). At diagenetic and hydrothermal stages water and oil were simultaneously activated and the strata\|bound gold deposits were formed from interactions between water, oil and rocks. In the late Yanshanian period, gold orebodies were enriched and enlarged in response to tectonomagmatism and action of complex ore\|forming hydrothermal solutions. As a result, it is highly expected to find suparlarge gold deposits and the Yanzi area is expected to be a perspective target area.
文摘The results have demonstrated that the studying area underwent four stages of geotectonie evolution,namely, pre-geosyneline, geosyneline, platform and diwa stages. The gold deposits were formed during diwa stage of the iste Yanshanian Age, undergoing multi-tectono-magmatic activities. Jiaodong Group of the Upper Archean Erathem was the source bed of gold deposits. Granitie msamatic aetivities dived the ore-forming elements transporting. Tectonic activities controlled the formation, the distribution of gold deposits and the scale and the shape of ore body, ete.. The gold deposits exhibit the eharacteristics multi-source of ore-forming elemcnts, multi-genesis, multi-ote-conttolling foctors, multi-genstical types and multi-stage mineralization. They belong to mantle-erust deposits.
