Establishment of Quick-Precision Grindability Testing Method and Application to Measurement of the Grindability of Dozens Kinds of High Purity Minerals.

目前，F. C. Bond的磨矿功指数（Wi）在世界上被广泛使用。但是，Wi的测量需要相当多的时间、劳动力和大量的矿物样品（10 kg）。根据本研究建立的快速精密可磨性试验方法，只需5g试样即可测定矿物的可磨性指数（a），并可由a计算出Wi。用下式表示这种关系，并计算了47种矿物和3种合成材料的Wi（kWh/t）。典型的例子如下：方铅矿5.30，石膏6.44，黄铜矿7.78，闪锌矿8.84，针铁矿9.02，赤铁矿10.64，铌铁矿10.89，黄铁矿11.43，白铅矿12.86，辉铜矿13.78，辉铜矿14.64，石墨15.96，铬铁矿16.35，尖晶石17.23，磁黄铁矿18.87，锆石19.36，锆石23.11，毒砂24.72。硬度对矿物的可磨性有一定的影响，但与可磨性的相关程度不高。研究表明，脆性和解理也是影响矿物可磨性的重要因素。

At present, F.C.Bond's Grinding Work Index (Wi) is widely used in the world. But, measurement of Wi needs considerably much time, labor and a lot of mineral sample (10 kg). According to Quick-Precision Grindability Testing Method which was established in this study, the grindability index (a) of minerals can be measured using only 5g samples and it has been cleared that Wi can be calculated from a. This relationship is shown by the following equation.Wi(kWh/t) of forty-seven kinds of minerals and three kinds of synthetic materials ws calculated. Typical examples are as follows : galena 5.30, gypsum 6.44, chalcopyrite 7.78, sphalerite 8.84, goethite 9.02, hematite 10.64, columbite 10.89, pyrite 11.43, cerussite 12.86, chalcocite 13.78, molybdenite 14.64, graphite 15.96, chromite 16.35, spinel 17.23, pyrrhotite 18.87, corundum 19.36, zircon 23.11, arsenopyrite 24.72. It means that lower Wi material is more grindable than higher Wi one.The hardness effects on the grindability of minerals to some extent, but degree of relationship between the hardness and the grindability is not so high. From this study it was clarified that the friability and the cleavage are also important factors which effect on the grindability of minerals.