基于X射线智能分选的预先抛废在某低品位铅锌矿中的应用

Application of Pre-Discarding Based on X-Ray Intelligent Separation in A Low Grade Lead-Zinc Mine

为解决铅锌矿山低品位矿石保有量大的问题,研究以甘肃某铅锌矿为原料,选用XNDT-104智能分选机进行了实验室分选试验,并在此基础上进行了低品位铅锌矿的工业生产试验,探明了不同抛废率条件下预选粗精矿及废石的品位变化规律,讨论了预先抛废在低品位铅锌矿中的应用效果。结果表明,预先抛废在低品位铅锌矿中的应用效果较好,不仅在作业抛废率为75%时取得了预选粗精矿铅、锌富集比分别为3.5、3.2的良好指标,而且生产过程中废石的铅+锌品位低于浮选尾矿品位0.25%,达到了预先富集和预先抛废的目的。同时,预选粗精矿和废石的铅锌品位均随抛废率的增大呈上升趋势,这是因为较低品位的连生体被当作废石抛掉,不仅会增大预选粗精矿中高品位连生体的比例,从而提高预选粗精矿的品位,还会增加废石中的铅锌金属量,当废石中金属量的增速大于抛废率增速时废石的铅锌品位便会增大。研究不仅可以有效降低矿山的边界品位,增大矿山资源储量,还能使废石不再进入磨选阶段,从而降低选矿成本,满足矿山增储降本的发展需求。

In order to solve the problem of large quantities of low-grade ore in lead-zinc mines, laboratory sorting tests were carried out, using a lead-zinc ore in Gansu as raw materials and XNDT-104 intelligent sorting machine as the main equipment. And on this basis, the industrial production test of low-grade lead-zinc ore was carried out. The grade change law of pre-selected coarse concentrate and waste rock under different waste rate conditions was studied. And the application effect of discarding waste in advance in low-grade lead-zinc ore was discussed. The results show that discarding waste in advance has a better effect in low-grade lead-zinc mines. Not only did it achieve good indicators with the lead and zinc enrichment ratios of the pre-selected crude concentrate of 3.5 and 3.2 respectively when the waste rate of the operation was 75%, but the sum of lead and zinc grades of the waste rock during the production process was less than 0.25%, the grade of flotation tailings. The purpose of pre-enrichment and pre-throwing is achieved. In addition, the lead and zinc grades of the pre-selected coarse concentrate and waste rock both show an upward trend with the increase in the discard rate. This is because lower-grade conjoined bodies are thrown away as waste rock, which will not only increase the proportion of high-grade conjoined bodies in the pre-selected coarse concentrate, thereby increasing the grade of the pre-selected coarse concentrate, but also increase the amount of lead and zinc in the waste rock. The lead and zinc grade of the waste rock will increase when the growth rate of the metal content in the waste rock is greater than the growth rate of the waste rate. The research can not only effectively reduce the boundary grade of the mine, thereby increasing the reserves of mine resources, but also the waste rock will no longer enter the grinding and beneficiation stage, which can reduce the cost of beneficiation. The above meets the development needs of mines to increase reserves and reduce costs.