Hot-pressure acid leaching of Cu is operated at 110 ℃ and 0.45 MPa of oxygen partial pressure,with the advantage of high recovery for valuable elements,simple technology and less pollution. The extraction rates of gold、silver、copper and sulfur are 98.3%,82.7%,98.1% and 99.2% respectively.
In order to provide reliable criteria for industrial test,a new separation technology for comprehensive recovery of valuable elements such as molybdenum,Zinc,iron and sulphur was examined on the basis of laboratory experimental research.
Hot-pressure acid leaching of Cu is operated at 110 ℃ and 0.45 MPa of oxygen partial pressure,with the advantage of high recovery for valuable elements,simple technology and less pollution. The extraction rates of gold、silver、copper and sulfur are 98.3%,82.7%,98.1% and 99.2% respectively.
In order to provide reliable criteria for industrial test,a new separation technology for comprehensive recovery of valuable elements such as molybdenum,Zinc,iron and sulphur was examined on the basis of laboratory experimental research.
The separation and enrichment of valuable elements in copper residue slag leached by chlorine in Jinchuan company were studied by the method of sodium sulfide leaching and SO_2 neutralization. The effect of temperature, concentration of Na_2S, molar ratio of Na_2S to S~0 and leaching time on leaching process were researched.
It shows that at 80℃ with a acidity of 180 g/L the leaching rate of Ga and Ge can reach 96.8% and 68.4%, respectively. Solvent extraction was employed to purify the valuable elements.
Analysis of the trace elements in the manganese nodules from the northern part of the Central Pacific Ocean shows that economically valuable elements such as Ni, Cu, Zn, Co, Pb, and Sr are quite rich in the investigation area.
Ore from Fankou Lead-Zinc mine is not only abundant in Pb、 Zn、 Ag and S, but also rich in rare metal resources such as germanium(Ge) and gallium(Ga), so it is worthwhilw to recover these valuable elements.
This paper analyzed the physical and chemical characteristics of thermal ground water in Shanxi province,as well as discussed the valuable elements and its origin of the thermal ground water and the drinking natural mineral water.
Selective chlorination of raw, unroasted samples with Cl2 + air, Cl2 + N2, and Cl2 + CO + N2 gas mixtures have been investigated for the recovery of valuable elements.
Support for the valuable elements in the European dimension of civic education does not entail support for a contrived notion of citizenship for inhabitants of nations who have long civic traditions of their own.
A hydrometallurgical process for recovering some valuable elements from the dust in smelting manganese-rich dregs is proposed. The dust is first treated with sulfuric acid, and then at appropriate pH, zinc together with manganese is separated by precipitation and subsequently converted into the corresponding sulfate and carbonate.
According to characteristics of uranium-bearing coal, this paper discusses the utilization of coal in processing the uranium-bearing coal, provides the techniques for the recovery of uranium from the uranium-bearing coal or coal ash, gives the applications of separation methods in its processing and studies the recovery of other associated valuable elements from it.
Guangxi-Dachang's jamesonite concentrate is a category of complex sul-fide concentrate which has been proved to be difficultly treatable. Thisthesis describes a new metallurgical process-oxidation-dry distillation pro-cess, which might be used for the treatment of such concentrate. The firststep of the process was to treat the concentrate to produce volative metalchlorides, residue and leached solution. Secondly, by use of various generalprocesses the intermediate products might be treated to extract antimo...