从钨尾矿回收长石的瓷球磨矿工艺设计

Design of Porcelain Ball Milling Process for Recovery of Feldspar from Tungsten Tailings

本研究以福建某钨选厂尾矿为研究对象,根据其1 000 t/d的处理量要求和-0.075 mm占75%的入选细度要求,进行全瓷球磨矿工艺设计,以回收钨尾矿中的长石资源。设计选用了带预先分级的一段闭路磨矿分级流程,要求瓷球磨矿排矿细度应达到-0.075 mm占40%以上,保证满足入选粒度要求。通过试验确定了瓷球磨矿工艺参数为:磨矿浓度60%、充填率40%、瓷球配比Φ25 mm:Φ20 mm:Φ15 mm为30%:40%:30%。与钢球磨矿对比,瓷球磨矿有着充填率高、磨矿浓度低、产品粒度分布好和磨矿能耗低等特点;球磨功指数试验结果显示,瓷球磨矿的可磨度比钢球高28.55%,功指数低18.54%;在功耗法对磨机选型的基础上,结合瓷球磨矿特点,对瓷球磨机筒体进行延长,进而增加磨矿时间,改造溢流堰而保证高充填率,完成了瓷球磨机的选型。结果表明瓷球磨机体积要大于钢球磨机,但所需功率更低。

In this research,the tailings of a tungsten processing plant in Fujian Province were taken as the research object.According to the requirements of the processing capacity of 1000 t/d and the fineness of-0.075 mm account for 75%,the all-porcelain ball grinding process was designed to recover the feldspar resources in tungsten tailings.A section of closed-circuit grinding classification process with preclassification is selected in the design,which requires that the fineness of porcelain ball grinding should be more than-0.075 mm account for 40%,which can ensure that the selected particle size can be met.Through the experiment to determine the porcelain ball grinding process parameters are:grinding concentration 60%,filling rate 40%,porcelain ball ratio of 25 mm:20 mm:15 mm=30%:40%:30%.Compared with steel ball milling,it is found that porcelain ball milling has the characteristics of high filling rate,low grinding concentration,good particle size distribution and low grinding energy consumption.The experimental results show that the grinding degree of porcelain ball mill is 28.55%higher than that of steel ball,and the work index is 18.54%lower.On the basis of the type selection of the mill by power consumption method,combined with the characteristics of the porcelain ball mill,the cylinder of the porcelain ball mill was extended to increase the grinding time,the overflow weir was modified to ensure the high filling rate,and the selection of the porcelain ball mill was completed.The results show that the volume of the porcelain ball mill is larger than that of the steel ball mill,but the power required is lower.