| Datun mineral processing plant is main production unit of YunXi Group Corporation, it's floatation ability of sulphide ore is 2800T/d. At present, the product of tin is more than 50 percent of Group Corporation's self-product Sn, the product of copper is one third of it's self-product copper. In 1990's, Oxide ore floatation was half stopproduct because it couldn't provide enough oxide ore. With the successful product of Da Malu engineering, the product of Da Tun floatation concentrate went into formal track, it had given great achievement for Group Corporation.The geology department had carried out exploit work since 1981, They had given in report in 1997. The type of ore was SnO2 in this ore stage. It become the emphasis exploit project of Group Corporation because of great reserve, good resource and well exploit prospect. A new area was planned to product 5000 ton tin each year.The floatation research work of exploiting Da Malu Oxide ore resource is the important component of exploiting resource to take experiment research in all respects. So Group Corporation and Da Tun mineral processing plant took the research as study and research theme of engineering graduate.To aim cfirectly at the character of thick coexistence of Sn-Feore , wrapping each other ,the fine crystal size of tin ore (max is 0.5mm, min is less than 0.02mm, common is 0.15~0.074mm), the pole shape, irregular particle, needle assembly, the fine particle assembly and overcrushing etc, a lot of study and research and analysis indicated :(1) If floatation processing based on fine grinding feed for less 0.2mm, two stages grinding no classifying and de-slime before floatation, all size and all quantity two stages floatation, re-separating subconcentrate, mid-ore whisking concentration, the good result were achieved : tin grade was 16.12 percent and tin recovery was 74.33 percent; (2) According to the old product process stream ,namely two stages grinding, three stage floatation, artificial classify before the first floatation, de-slime, the particle of +0.074mm entering into sand to floatation, concentrating duplicate washing subconcentrate , the first fine grinding feed to less 0.2mm, the index achieved better than the index of rough grinding.According to the result of experiment and integrating the fact of production, the process stream was recommended as follow : the particle size of first grinding is -0.6mm, two stage crushing, three stage floatation, no classify and de-slime before the first shakingtable separation, using the processing of mingle floatation slime and sand, concentrating re-separating subconcentrate, thickening before each stage, using the slime of feed processing to float overflowagain.The product of coarse Sn-concentrate enter into magnetic separation or magnetic-float process to carry out deep process, it can get qualified tin concentrate, mingle ore and rich mid-ore, or it exchanged course tin concentrate for qualified tin concentrate with other department.The above research result is successful in production application and has notable technical and economical index. The product index of 1-6 months this year: tin grade of feeds is 1.315 percent, tin grade of concentrate is 13.25 percent, tin recovery is 76.41 percent.The ability of processing increases 145 ton each day than before, the cost of product descend from 38 Yuan each ton to 30 Yuan each ton.This research ore of Da Malu achieves some result not only in ore mineralogical research and mineral processing technology, but also in result application. Da Malu project is the strategy project of Group Corporation, it has great strategy significance. The study and research of mineral processing is important components of the project, the successful application of the result of study and research has some great significance in future long-term product. People have new knowledge among the relation of fine-grinding, overcrushingand recovery from fine-grinding entering floatation, no classify and de-slime, mingle floatation slime and sand, p... |
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