北衙金礦鐵錳氧化物中銅、銀賦存狀態(tài)及其形成過程模擬研究
[Abstract]:Iron manganese oxide is an important mineral resource. The main minerals are limonite, permanganite and associated valuable elements such as Au,Ag,Cu,Pb, which have huge reserves. Ag,Cu and other associated elements have very similar geochemical parameters to iron and manganese. This leads to the complex occurrence of associated elements in iron and manganese oxides. At present, the study on the occurrence of associated elements in ferromanganese oxides is insufficient, especially on the dispersion form of associated elements. However, the associated elements in mineral form can only be recovered in production, but it is difficult to recover the associated elements in dispersed form effectively, which leads to a low recovery rate of associated elements. In this paper, the composition and content of minerals were analyzed by chemical analysis and MLA detection, and the occurrence states of copper and silver in iron and manganese oxides were fully studied by microscope observation, MLA,XRD,EPMA binding adsorption test and electrodialysis test. The formation process of copper and silver in iron and manganese oxide was simulated by roasting test, adsorption test and electrodialysis contrast test. The following conclusions were obtained: the limonite of Beiya gold deposit in Dali, Yunnan Province was taken as the object of study. The single mineral of limonite extracted from raw ore was analyzed by chemical analysis and MLA analysis. Limonite is of high purity and contains a small amount of permanganite, lead permanganite and other minerals. The element content of limonite is analyzed by Fe52.42%,Mn3.08%,Cu0.33%,Ag50.16g/t.. Studies on the occurrence of copper and silver show that a small amount of copper and silver occur in the form of independent minerals and fine inclusions in ferromanganese oxide ores. The mineral forms are snail sulfide silver, hornblende, natural silver, malachite, chalcopyrite, inhomogeneous distribution of grain size between 1~30um. Most of the copper and silver are dispersed in limonite and permanganite in the form of ion adsorption and isomorphism. The adsorption of copper and silver ions on the surface layer of limonite and permanganite was studied by using the synthetic ferric oxide and manganese oxide colloid. The adsorption test results show that the adsorption capacity of manganese oxide is stronger than that of iron oxide under the same conditions. The adsorption of copper and silver on manganese oxide surface includes specific coordination adsorption and electrostatic adsorption, but only specific coordination adsorption on iron oxide surface. The adsorbed iron oxide and manganese oxide colloid were roasted and recrystallized. The results show that the electrodialysis rate constant of copper and silver in crystal is smaller than that in colloid. It is inferred that part of copper and silver in limonite and permanganite in recrystallization process are transformed from initial adsorption state to metamorphic form into limonite and permanganite lattice.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TD91
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