| Jinchuan No.2 mining areas rich ore and Longshou mining ore belong to the different mining areas. The nature of the ore of the two mining areas also have some differences. In practice, the differences of processing flowsheet, reagents system and flotation indexes also exist.To strength the competition ability, JNMC made a strategic target to do greatly and stongly. But from the farsigted programming of the company , the ability of mineral processing will become a weak link in the main flowsheet of the company after 2008(the gap of mineral processing ability will be 4.4 miliion t/a till 2010 year).Therefore,the company made a decision that a new system of 14000t/d mineral processing will be built and apply large modern equipment to construct the new system. But the new system can't use the method that applies different system of production to the different ores at present. So we plan to mix the No.2 mining areas rich ore with Longshou mining ore. Then deal with them by the newly-built system — Mineral Processing 14000t/d.The researchers focus the test on the mixing-flotation of Jinchuan No. 2 mining areas rich ore and Longshou mining ore. The purpose is to make sure the feasibility of mixing-flotation of the two kinds of ores and find the new technology by the test of mineral processing. At the same time, it can provide the referential material to the newly-built system of 14000t/d in Jinchuan mineral processing plant.On the foundation of the research of the mineral component and disseminated characteristics of No.2 mining areas rich ore and Longshou mining ore, researchers carried on the mineral processing experiment to separate the two kinds of ore respectivly,and optimize the main reagentsunder on the mineral processing flowsheet condition of the two ores at present,then the grade of Ni concentrate in No.2 mining areas rich ore is 8.98%,Cu 4.67%, MgO 6.64%,and the recovery of Ni is 86.92%, Cu 70.97%;the grade of Ni concentrate in Longshou mining areas is6.32% > Cu5.269^ MgO8.16%;and the recovery of Ni is 83.00% > Cu73.74%.we conduct the research on the mixing-flotation from reagents system and flowsheet structure according to the proportion of the two mining areas ores that come out. We confirm that the grinding fineness of the mixing-ore mineral processing is the primary stage 70%-0.074mm and the secondary stage 85%-0.074mm. Flotatio? n technology is the primary stage one roughing, two cleaning.The secondary stage one roughing,two scavenging, three cleaning. Flotation reagents is ammonium sulfate,sodium hexametaphosphate, copper sulfate, xanthate collectors BD, frothers QJ. the grade of Ni concentrate of the mixing-ore is 8.07% >. Cu5.02> MgO6.47%;and the recovery of Ni is 86.24% > Cu72.84%.The grade of Ni concentrate is 0.15% higher Cu 0.19%higher^ MgO 0.63% lower,the recovery of Ni is 0.62% higher Cu 0.90% higher. The index of mixing-ore is not lower than the result of the average separation index when the two ores processed separately,so the mixing-flotation of No.2 mining areas rich ore and Longshou mining ore is fessible.In order to improve the separation index of the mixing-ore,we carry research on the new technology of the mixing-ore mineral processing. By the comparison of several flowsheet structures test, two grindings and two flotations, the secondary stage middling focus regrinding and reflotation, the flowsheet of one concentrate product project separation effect is better. The flowsheet resulted in experiment index are: the grade of Ni concentrate is 8.10%^ Cu 4.98% > MgO 6.36%;the recovery of Ni is 87.12% > Cu 73.39%. The new technology of middling regindind-reflotation have some effect to improve the quality of concentrate and recovery.The research found that mixing-flotation of No. 2 mining areas rich ore and Longshou mining ore is feasible, so the newly-built system — Mineral Processing 14000t/d can be carried out all right. |
PDF Full Text Request