Pyrite and sphalerite were grounded to 0.147 mm in a cylinder mill and chalcopyrite and galena to 0.097 mm in an agate ball mill. The F-test results showed that the degree of homogeneity is satisfactory for all samples.

• 黄铁矿和闪锌矿用棒磨机少量多级粉碎至0.；147mm，方铅矿和黄铜矿用小型玛瑙球磨机粉碎至0