| Copper-molybdenum separation has been a difficult problem in the beneficiation technology for its mineralogy for a long time.A copper-molybdenum flotation plant has been ran for nearly two years.But the complex mineralogy characteristic results in the poor effect of copper-molybdenum separation,the instable result,the low quality of production. The Cu concentrate and Mo concentrate for sale are hard to satisfy the request for grade. The grade of Cu concentrate is usually between 14% and 16%.The grade of Mo concentrate is usually between 23% and 26% after eight cleaning. According to standard criterion. The grade of ll-level Cu concentrate is 20%, but the grade of present production is about between 14% and 18%,which only belongs to between 14-level and 12-levelCu concentrate. The grade of Mo concentrate is at least 40%.The lower Mo concentrate is at least 35%.Obviously, the production doesn't satisfy the request.The thesis mainly takes the copper-molybdenum concentrate as research object, which focuses on several aspects including ore mineralogy, the test for copper-molybdenum separation, the test for Mo concentrate cleaning and the test applying conclusion in lab into practice.With the research on ore mineralogy, it is knowed that Mo concentrate includes a large quantity of Si, Mg, Ca, Na, K, which show that Mo concentrate includes a lot of gangue with garnet, diopside, zoisite, tremolite, dolomite, quartz and so on.The molybdenite and chalcopyrite accrete together in the ore, which brings the large difficulty to the copper-molybdenum separation. The molybdenite is hard to be separated from chalcopyrite and gangue for its scalelike. Because molybdenite has the similar surface characteristic with garnet, diopside, dolomite, amphibole and zoisite under the reagent. It is hard to separate molybdenite from gangue. It is hard to upgrade the Mo concentrate grade.In order to improve copper-molybdenum separation. The condition tests are done on several factors affecting copper-molybdenum separation.The conclusion as follows:Omin for grinding time,20% for pulp concentrate,40 kg·t-1 for the dosage of Na2S,1 kg·t-1 for the dosage of Na2Si03,0.5 kg·t-1 for the dosage of coal oil.Under the foundation of these the most optimum value, The compositive open circuit test of copper-molybdenum concentrate is done, one roughing, one scavenging and four cleaning is adopted to get Mo flotation concentrate with 24.56% for Mo grade and 65.01% for Mo recovery and to get Cu flotation concentrate with 20.92% for Cu grade and 91.46% for Cu recovery.In order to improve Mo concentrate grade,The condition tests are done on several factors affecting Mo concentrate cleaning.The conclusion as follows:10min for grinding time,15% for pulp concentrate,17min for flotation time,10 kg·t-1 for the dosage of Na2SiO3,1 kg·t-1 for the dosage of coal oil. Under the foundation of these the most optimum value,The compositive open circuit test of Mo concentrate is done, regrinding and two cleaning is adopted to get Mo flotation concentrate with 48.10% for Mo grade and 74.18% for Mo recovery and 0.22% for Cu grade.In order to put the conclusion into the practice, three comparative test are done in the plant, including no-grinded and grinded copper-molybdenum concentrate, no-grinded and grinded molybdenum concentrate and circle water and water in practice. The conclusion as follows:Whether grinding has little effect on Mo grade and recovery of copper-molybdenum concentrate,before separation flotation,grinding isn t important.the Mo grade and recovery of regrinded Mo concentrate in is better than no-grinded.the Mo recovery of applying circle water is 76.19%, while Mo recovery of applying water is 92.04%. |
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