【摘要】 针对西藏某大型选矿厂在处理高海拔复杂氧化铜浮选精矿时存在品位不合格、回收率不理想的问题,对矿物开展工艺矿物学研究,基于此开展磨矿细度及浮选药剂制度优化试验。工艺矿物学研究表明:原矿铜氧化率为36.80%,其中结合氧化铜占16.59%,铜品位为0.51%,金品位为0.25×10-6,银品位为14.24×10-6,矿石中含铜量较高的次生铜矿物砷黝铜矿多与黄铁矿连生或共生,影响到铜精矿的质量和铜的回收率;矿石中含有一定的白云母、长石、石膏和方解石等,在磨矿过程中极易产生泥化现象,影响铜矿物上浮。为此现场在选矿中通过添加大量石灰,利用高碱度和新型药剂T506来抑制黄铁矿的上浮。试验室闭路试验表明:采用现场一粗三扫三精浮选流程,在粗选作业段采用新型抑制剂T506替代部分石灰,并适当增加Na2S用量,精选作业段在pH=11的基础上适量增加T506用量,可获得精矿铜品位为19.72%,金品位为2.66×10-6,银品位300.36×10^-6,铜回收率为65.50%,金回收率为18.36%,银回收率为35.92%的试验指标。精矿品位较现场生产条件提高了9.18%,铜选矿作业回收率提高了4.87%。更多还原

【Abstract】 The grade of high-altitude complex copper oxide flotation concentrates treated in a large-scale concentrator in Tibet was unqualified,and the recovery rate was not satisfactory.Through the study of mineralogy of minerals,the embedding characteristics of metal minerals and gangue minerals was obtained.The secondary copper ores with high copper content as well as the mineral arsenic bismuth copper ore are closely embedded with pyrite,where a mixture of copper and iron minerals often forms,which can affect the quality of copper concentrate and the recovery rate of copper. There are a certain amount of muscovite,feldspar,gypsum and calcite in the ores. Muddy phenomenon is prone to occur during the grinding process,which can affect the copper mineral floating. Thus,the optimization of grinding fineness and flotation reagent system for this refractory oxide copper ore was carried out in this study.On the spot,a large amount of lime was added,and the pH value was adjusted to 11 using high alkalinity to inhibit the rise of pyrite. From the study of process mineralogy,it was known that pyrite was dissolved by pyrite,and pyrite was suppressed at the same time.It will affect the rise of copper minerals.The new drug T506 is an inhibitor developed for the characteristics of pyrite.This inhibitor interacts with the surface of pyrite by adjusting the arrangement of polar groups to achieve the effect of inhibiting the rise of pyrite.The laboratory closed-circuit test was conducted in condition of the copper oxidation rate of ore is 36.80%,where combined copper oxide is 16.59%,copper grade is 0.51%,gold grade is0.25×10-6,and silver grade is 14.24×10-6.In the selection process,the new inhibitor T506 is used to replace part of the lime in the rough selection section,and the amount of sodium sulfide is appropriately increased.On the basis of ensuring the pH value of 11 in the selected operation section,the amount of T506 is increased in an appropriate amount to obtain a concentrate with a copper grade of 19.72%,a gold grade of 2.66×10^-6,a silver grade of 300.36×10-6,a copper recovery rate of 65.50%,a gold recovery rate of 18.36% and a silver recovery rate of 35.92%. The concentrate grade increased by 9.18% compared with the one in on-site production conditions,and the copper beneficiation recovery rate increased by 4.87%. Under the premise of ensuring the qualified copper grade of the produced concentrate,the recovery rate of copper is correspondingly increased,and the purpose of increasing the economic benefits of the enterprise and comprehensively utilizing valuable mineral resources is achieved.更多还原