| The nature of some mining ores is complex, which contains copper-sulfur mineral. This ore mineral composition is complex. Especially, the copper ore species have eight kinds. The structure of mineral is also complicated. The embedding is different granularity, having three granularitise, which is medium,thin and micro. But its main granularity is thin and micro. The mineral monomer disaggregation is very poor.Therefore, the separation of copper-sulfur ore is very difficult.The purpose of the paper is studying the low alkali separation technology of complex copper-sulfur ore, looking for the high selective separation flotation reagents and flow-sheet, which is suitable for the complicated copper-sulfur ore, taking potential controlled flotation technology as the mainly guiding ideology. Firstly, understand comprehensively the various flotation electrochemical properties of this chalcopyrite and pyrite,based on the studying of chalcopyrite and pyrite single mineral flotation. And then, studied successfully the low alkali separation technology of complex copper-sulfur ore, taking the flotation test results of single mineral as a guide, according to the studying of the actual mineral process mineralogy. The paper explain the action of collector (QX) and mineral surface, in order to explain better the mechanism of the action, by the ultraviolet spectrum test and infrared spectroscopy test. Moreover, clarify the surface oxidation mechanism of chalcopyrite and pyrite by the thermodynaic analysis.Results of the research show that: (1)The best one is collcetor-indueed flotation, the second one is sulfur-induced flotation, and self-induced flotation is the worst, between the three induced flotations. The flotability of chalcopyrite and pyrite is very good under the condition of neutral pulp, but the flotability is poor under the condition of acidic or alkaline pulp, especially under the condition of strong acid or strong alkali pulp. (2)The best inhibition effect is lime (CaO), between hyposulphite (Na2S2O3), times calcium chloride (Ca(ClO)2) and lime (CaO), under the condition of taking QX as collector. (3)When pyrite is separated from chalcopyrite, it is very important to choice pulp potentian. But, at the same time ,the matching between pulp pH, reagent and pulp potential are also important. As long as they are matched, two minerals can be separated. (4)Through the ultraviolet spectrum test and infrared spectroscopy test showing that: The adsorption of collector-QX is more obvious on chalcopyrite surface, under the condition of with and without inhibitor lime (CaO). But the adsorption of collector-QX is not clear on pyrite surface, under the condition of with inhibitor lime (CaO). (5)Thermodynamic analysis shows that: if pulp potential is appropriate, two kinds of minerals surface are likely to be oxidated to element sulfur S0 in the whole pH range. (6)The actual ore had a grade of 18.43% and a copper recovery of 87.54%, taking stage selective flotation middling-regrinding and reprocessing as flow-sheet processing, when collector is QX and inhibitor is lime (CaO). That is suit for the complex nature of the actual mineral. |
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