錫石及煤的選擇性磨碎現象是有害的，對其回收不利，所以就應該采用作用相反的設備，來保護有用礦物少遭磨碎的球磨機及ji篩shai子zi來lai抵di消xiao這zhe種zhong現xian象xiang，或huo稱cheng之zhi為wei弱ruo化hua。對dui於yu礦kuang物wu的de選xuan擇ze性xing磨mo碎sui現xian象xiang有you害hai的de情qing況kuang

，企qi圖tu從cong礦kuang物wu自zi身shen去qu弱ruo化hua大da概gai是shi不bu可ke能neng的de
，也ye沒mei有you人ren在zai這zhe方fang麵mian進jin行xing研yan究jiu。因yin此ci，選xuan擇ze性xing磨mo礦kuang作zuo用yong的de弱ruo化hua隻zhi能neng通tong過guo球qiu磨mo機ji磨mo礦kuang分fen級ji設she備bei的de調tiao節jie作zuo用yong來lai實shi現xian。所suo以yi，在zai此ci僅jin指zhi出chu以yi下xia幾ji點dian，對dui球qiu磨mo機ji選xuan擇ze性xing磨mo礦kuang的de應ying用yong有you參can考kao價jia值zhi。
        （1）zaisuoyouchangjiandemokuangshebeizhong

，qiumojimosuichanpinchangchengduojiaoxing，kelibianyuanjianrui，kelizhonglianshengtibilijiaoduo。zhedagaishiyouyuqiumojideposuizuoyongshigangqiuzhijiande“點接觸”造zao成cheng的de，在zai點dian打da擊ji下xia過guo載zai荷he破po碎sui的de情qing況kuang不bu少shao，自zi然ran使shi貫guan穿chuan破po碎sui作zuo用yong增zeng多duo
，故gu解jie離li性xing差cha的de破po碎sui現xian象xiang增zeng多duo
，連lian生sheng體ti顆ke粒li增zeng多duo，同tong時shi產chan品pin中zhong礦kuang泥ni增zeng多duo。
        （2）zaimuqianchangjiandefenjishebeizhong，shuyushuilifenjideluoxuanfenjijijishuilixuanliuqidexuanzefenjizuoyongyejiaocha，yinweifenjishoumiduyingxiangda
，zaichenshazhongchangchuxiandamidukuangwudefuji，fanhuiqiumojizaimoyizaochengguomojiguofensui，congerjiangdizheleikuangwu（常常是回收的目的礦物）回收的效率。
        （3）qiumojijishuilifenjijijunshixuanzexingmosuizuoyongbushihenhaodeshebei，tamendetongxiangdiejiajiangjuyoujiaochadexuanzemosuizuoyong，tamenyuqitashebeidezuheyenengruohuaqitashebeidexuanzexingmosuizuoyong。lirubangmojibenlaijuyouqiangdexuanzexingmosuizuoyong（選擇性地破碎粗粒而保護細粒，對保護脆性大比重礦物的作用強），但dan如ru果guo與yu螺luo旋xuan分fen級ji機ji組zu合he使shi用yong，則ze螺luo旋xuan分fen級ji機ji加jia速su脆cui性xing大da密mi度du礦kuang物wu的de扮ban碎sui作zuo用yong將jiang抵di消xiao棒bang磨mo機ji的de保bao護hu作zuo用yong，較jiao使shi此ci機ji組zu選xuan擇ze性xing保bao護hu脆cui性xing大da比bi重zhong礦kuang物wu的de作zuo用yong變bian差cha。
　　采cai用yong選xuan擇ze性xing磨mo碎sui作zuo用yong差cha的de設she備bei或huo者zhe它ta們men的de組zu合he，可ke以yi顯xian著zhu弱ruo化hua選xuan擇ze性xing磨mo碎sui作zuo用yong。過guo去qu有you人ren認ren為wei選xuan擇ze性xing磨mo礦kuang難nan於yu應ying用yong
，原yuan因yin之zhi一yi就jiu是shi他ta們men是shi根gen據ju選xuan擇ze性xing磨mo礦kuang作zuo用yong差cha的de設she備bei及ji組zu合he的de緒xu果guo所suo得de出chu的de結jie論lun。但dan是shi如ru果guo采cai用yong選xuan擇ze性xing磨mo碎sui作zuo用yong強qiang的de設she備bei及ji組zu合he的de同tong向xiang疊die加jia，這zhe時shi隻zhi要yao礦kuang物wu的de選xuan擇ze性xing磨mo碎sui現xian象xiang比bi較jiao顯xian著zhu便bian可ke以yi采cai用yong選xuan擇ze性xing磨mo礦kuang，且qie可ke以yi取qu得de高gao效xiao率lv及ji低di消xiao耗hao的de良liang好hao結jie果guo。
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