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排序方式: 共有263条查询结果,搜索用时 15 毫秒
1.
结合东同矿业公司井下原地溶浸的试验研究情况,分析了细菌浸出-萃取-电积工艺过程中存在的问题并提出了解决方法,探讨了该工艺应用研究的发展方向与前景。 相似文献
2.
In the flotation of copper ores, several processing plants report that copper recovery is affected by the proportion and reactivity of pyrite in the ore, with the effect becoming more intense when the feed particles are finer as a result of regrinding. In this work, a mixed model mineral system consisting of chalcopyrite (CuFeS2) and pyrite (FeS2) with varying pyrite content (20–80 wt.%) was used to investigate the effect of pyrite on the pulp chemistry and chalcopyrite recovery. Flotation tests showed that chalcopyrite flotation rate, recovery and grade, as well as the pulp oxidation potential, decreased with increasing pyrite content whilst pyrite recovery increased. Surface analysis (XPS, ToF-SIMS and EDTA) indicated that copper activation of pyrite increased with increasing pyrite content, facilitating pyrite recovery. The decrease in chalcopyrite recovery can be attributed to increased surface oxidation. 相似文献
3.
The bioleaching of pure chalcopyrite by thermophilic Archaea strain Acidianus manzaensis YN-25 under different constant pH was first comparatively investigated. Then the relevant sulfur speciation was analyzed by synchrotron radiation based X-ray diffraction (SR-XRD) and S K-edge X-ray absorption near edge structure (XANES) spectroscopy. The acidity of the leaching solution was monitored at 3-h intervals to make it steady at pH 1.25, 1.50, 1.75, 2.00, 2.25 and 2.50, respectively. Leaching results showed that the copper ion extraction increased during chemical leaching but decreased during bioleaching when pH value decreased from 2.50 to 1.25. SR-XRD analysis showed that, during bioleaching, new elemental sulfur (S0) phase was detected at all tested pH cases; new jarosite phase was detected at cases of pH 1.50 to 2.50; and jarosite gradually became a major phase when pH value increased. XANES analysis further showed that covellite was detected during bioleaching at cases of pH 1.25 to 2.00 at higher redox potential (ORP) value, while chalcocite and bornite were detected at cases of pH 2.25 and 2.50 at lower ORP value. These results suggested that the formation of S0 was mainly accounting for hindering the dissolution of chalcopyrite while the formation of bornite could accelerate the dissolution of chalcopyrite by A. manzaensis. 相似文献
4.
The cooperative interactions between chalcopyrite and bornite during bioleaching by mixed moderately thermophilic culture were investigated mainly by bioleaching experiments and electrochemical experiments. Bioleaching results showed that a cooperative effect existed between chalcopyrite and bornite. When the mass ratio of chalcopyrite to bornite was 3:1, an extremely high copper extraction of more than 88% was achieved after bioleaching for 27 days. One of the major reasons for the cooperative effect was that a certain redox potential range (370–450 mV vs. Ag/AgCl) could be maintained for a long period of time during bioleaching due to the mixture of chalcopyrite and bornite. Electrochemical measurements revealed that chalcopyrite was much easier to be reduced than oxidized, while bornite was prone to be directly oxidized. Hence, galvanic effect between chalcopyrite and bornite enhanced the reduction of chalcopyrite to secondary copper-iron species and promoted the oxidative dissolution of bornite. Therefore, redox potential controlling and galvanic effect both contributed to the cooperative bioleaching of chalcopyrite and bornite. 相似文献
5.
R. Klenk J. KlaerCh. Köble R. MainzS. Merdes H. Rodriguez-AlvarezR. Scheer H.W. Schock 《Solar Energy Materials & Solar Cells》2011,95(6):1441-1445
Starting from a small area cell published in 1993, CuInS2 technology has been continuously improved with respect to performance and manufacturability. Major milestones include successful preparation by rapid thermal processing, a monolithically integrated module test structure on a 5×5 cm2 substrate, implementation of an industrial pilot line, incorporation of gallium for higher open circuit voltages and better performance and demonstration of Cd-free devices. Phase formation, reaction pathways and interdiffusion mechanisms have been investigated and modelled as have been electronic and device properties such as current transport. This review summarizes the most significant aspects of development and our current understanding of the technology. 相似文献
6.
7.
以黄铜矿为研究对象,在温度较低的浸出条件下(15℃)采用正交试验的方法考察了矿石粒度、矿浆浓度、酸度、接种量以及起始Fe2+浓度对氧化亚铁硫杆菌(T.f菌)摇瓶浸出黄铜矿浸出过程的影响。试验结果表明:初始Fe2+浓度对细菌浸铜工艺影响最为显著;在15℃下的最佳浸出工艺条件为初始Fe2+浓度为6g/L,酸度控制在pH=2.0,接种量保持在15%,矿浆浓度为15%,矿石粒度为-200目。 相似文献
8.
AgInSe2 powders were successfully prepared via mixing sol-gel derived precursors, followed by a selenization process. To obtain the pure AgInSe2 compound, excess amounts of In3+ ions were added into the starting solution to compensate the loss of In2O3 during the selenization process. A figure that depicts the relationship between the resultant compounds and different selenization temperatures was constructed according to the formed phases. The Raman spectrum and Rietveld refinement confirmed that the prepared AgInSe2 belonged to the chalcopyrite structure. With increasing selenization temperatures, the AgInSe2 powder particle sizes as well as the crystallinity increased significantly. The AgInSe2 formation mechanism during the selenization process is proposed as a two-step process. Ag2Se is formed in the first step and then induces the second-step reaction to produce AgInSe2. The sol-gel route with a selenization process is introduced as a new approach to fabricate pure AgInSe2 powders for use in thin-film solar cells. 相似文献
9.
This paper studies the effects of quartz on bioleaching of chalcopyrite by Acidithiobacillus ferrooxidans, LD-1 through shaking flask experiments. The results showed that quartz concentration can affect the copper extraction. After 32 days, copper extraction of the leaching system at 50 g L−1 quartz concentration increased by about 20%, compared with that of the leaching system without quartz. XRD analysis showed that the amounts of jarosite on the chalcopyrite surface may reduce by the mechanical friction action between fine particles of quartz and chalcopyrite. The analysis of SEM indicated that the surfaces of chalcopyrite particles were eroded by different degrees and the degrees of change were the same as the effects of quartz concentration on copper extraction. 相似文献
10.
Structural aspects of adamantine like multinary chalcogenides 总被引:2,自引:0,他引:2
S. Schorr 《Thin solid films》2007,515(15):5985-5991
The present state of knowledge of structure, phase relations and metal ordering in 2(ZnX)x(CuBX2)1 − x (B = Ga, In and X = S, Se, Te) and Cu2ZnxFe1 − xSnS4 multinary compounds is discussed. The chemical disorder process in 2(ZnX)x(CuBX2)1 − x alloys leads to a phase separation, i.e. in a certain composition range (2-phase field) two phases, tetragonal domains and a cubic matrix, coexist. Its width depends on the three-valent cation only and is independent from the size of anion. In the subsolidus region of the 2(ZnX)x(CuBX2)1 − x system the stability range of tetragonal mixed crystals as well as the miscibility gap is decreasing, the stability range of cubic mixed crystals is increasing. The process of structural disorder in 2(ZnX)x(CuBX2)1 − x as well as Cu2Fe1 − xZnxSnS4 alloys is connected to the cation substructure. In tetragonal 2(ZnX)x(CuInX2)1 − x alloys a non-random Zn distribution on the both cation positions of the chalcopyrite-type structure was revealed, whereas a random distribution of Zn and Cu on two different sites of the kesterite type structure was obtained in Cu2ZnSnS4 in contradiction to literature. The crossover from stannite (x = 0) to kesterite (x = 1) in Cu2Fe1 − xZnxSnS4 is considered as a three-stage process of cation restructure involving Cu+, Zn2+ and Fe2+, whereas Sn4+ does not take part in this process. In tetragonal 2(ZnX)x(CuInX2)1 − x alloys the anion displacement is decreasing with increasing ZnX content in CuInX2 indicating a decreasing tetragonal distortion. Here the disorder process in the cation substructure and the displacement process in the anion substructure are coupled. 相似文献