随着半自磨流程在国内大型矿山的日益普及,对如何处理半自磨机磨矿过程中产生的顽石,各选厂采用的方式不尽相同.利用半自磨机顽石充当立磨机磨矿介质处理这类顽石并对此开展顽石的磨矿条件试验研究,包括:磨矿时间、充填率、磨矿浓度和磨矿处理量等条件试验,以及顽石、钢球磨矿介质对比试验.试验结果表明:半自磨机顽石可以作为磨矿介质在立磨机内使用,其损耗量相比较于传统钢球的损耗量(大约0.05%)是较大的,一般在1%~2%之间.在磨矿时间3 min、填充率60%、磨矿浓度65%、磨矿量5 kg时可获得满足浮选要求的磨矿产品.在磨矿时间3 min、立磨机转速210 r/min、磨矿浓度65%、磨矿量5 kg、磨矿介质直径10~20 mm、充填率60%的条件下进行顽石和钢球磨矿介质的磨矿对比试验,结果表明,钢球磨矿产品的细度比顽石磨矿高16.72%,过粉碎粒级产率高2.35%,钢球的磨矿效率大于顽石,但顽石磨矿产品中0.045~0.038 mm的产率高于钢球磨矿,说明顽石充当磨矿介质时易使被磨矿物磨细到嵌布粒度的大小,会使产品粒度分布更合理.%With the rising popularity of Semi Autogenous Grinding (SAG) in domestic large mines, there are different ways to dispose the pebble from SAG. The pebble grinding effect tests were carried out using pebble as a kind of grinding media in the vertical mill to deal with the pebble, which included conditional experiments of grinding time, filling ratio, grinding concentration and grinding handling capacity, as well as media contrast experiments of pebble and steel ball grinding. The results show that the SAG pebble can be used as a kind of grinding media in the vertical mill. But the wastage of pebble is larger than the steel ball(about 0.05%), typically 1%~2%. When the grinding time is 3min, filling rate is 60%, grinding concentration is 65%, grinding weight is 5 kg, grinding effect can satisfy the requirement of flotation in practice. The contrast experiment of steel ball and pebble in the same conditions was studied under the grinding time of 3 min, the speed of 210 r/min, grinding concentration of 65 %, grinding quantity of 5 kg, medium diameter of 10~20 mm and filling rate of 60 %. The result shows that the fineness of steel ball is higher 16.72%than the pebble, overcrush is higher by 2.35%, but the 0.045~0.038 mm yield of pebble is higher than steel ball, indicating that pebble medium can easily make the size of mineral grinding to fine disseminated extent which makes the particle size distribution more reasonable.
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