齐大山铁矿石高压辊磨产品磨矿及解离特性研究

Grinding and Liberation Characteristics of the High-pressure Grinding Roller Product for Qidashan Iron Ore

以齐大山铁矿细碎矿石为对象，考察其高压辊磨机粉碎产品的磨矿特性和单体解离特性，并与实验室颚式破碎机粉碎产品进行比较，结果表明：当目标粒度分别为0．074和0．280mm时，辊压产品的邦德球磨功指数分别比颚破产品的降低13．96％和28．23％；在-0．074mm占80％磨矿细度下，一3．2和3．2—0．074rnm辊压产品与对应颚破产品的相对可磨度分别为0．83和0．86；辊压产品与颚破产品相比，-0．5mm粒级中铁矿物的单体解离度高15．16个百分点，不同磨矿细度下的磨矿产物中铁矿物的单体解离度高5．55—0．98个百分点；辊压产品磨矿产物中的连生体属于二次磨矿时易于解离的连生体，而颚破产品磨矿产物中的连生体属于二次磨矿时难以完全解离的连生体。

Taking fine crushing ores from Qidashan iron ore as study object, the grinding characteristics and liberation characteristics of high pressure grinding roller product were investigated and compared with that of the laboratory jaw crush- ing products. The results showed that： the Bond ball mill work index of HPGR products were respectively lower by 13.96% and 28.23% than that of the jaw crushing product when the particle was in O. 074 mm and O. 280 mm. With regrinding fineness of - 0. 074 mm 80% , the relative grind-ability of HPGR and JC product in particle size of - 3.2 mm and 3.2 0. 074 mm reached 0.83 and 0.86. Compared with the JC products, the liberation degree of HPGR product in - 0.5 mm was increasing bylS. 16% , and the liberation degree of iron ore in HPGR product is higher by 5.55 to 0.98 percent point under different grinding fineness. In addition, the intergrowth of valuable minerals in HPGR product can be easily liberated at secondary grinding, while JC product was in reverse.