微波助磨技术处理某钼矿

Microwave-assisted Grinding of a Molybdenum Ore

以金堆城低品位铜钼矿为研究对象,取破碎后粒度为-2 mm的矿石,分别经常规加热及微波加热预处理,然后水淬骤冷,考察相同磨矿条件不同预处理方式对试验样磨细的影响,通过力学分析经常规加热和微波加热预处理后试验样岩石强度的变化情况,并借助SEM-EDS研究了微波加热对矿石内部产生裂纹的影响。结果表明,对该试验样加热到相同温度时,采用微波加热的预处理方式,更易使试验样磨细。常规加热预处理和微波加热预处理后试验样岩石强度随加热温度的升高都有不同程度的减弱,但采用常规加热预处理方式较微波加热预处理方式岩石强度的减弱程度更大。采用微波加热的预处理方式,当温度达到350℃时,然后进行水淬处理,通过SEM可检测出辉钼矿和黄铜矿与硅酸盐矿物边缘处出现了裂缝。

With the low-grade copper-molybdenum ore from Jinduicheng as the research object, conventional heating and microwave heating were employed to previously deal with the crushed ore with a grain size of -2 mm, and followed by water quenching. The different pretreatment methods on the sample grinding were investigated under the same grinding conditions. Though mechanical analysis, variation of rock strength after conventional heating pretreatment and microwave heating pretreatment, respectively, was identified. The effect of microwave heating on the cracks in the ore was studied using scanning electron microscope coupled with energy dispersive spectroscope. The results show that with the microwave heating pretreatment the test sample is easier to milling under the same healing temperature condition. With the increasing of heating temperature, after pretreatment, the rock strength is decreased to varying degress. However with microwave heating pretreatment, the weakening extent of rock strength is bigger than that with conventional heating pretreatment. With microwave heating pretreatment, when the temperature reaches 350 ℃ and followed by water quenching, the intergranular cracks appear on the boundaries between molybdenite, chalcopyrite and silicate minerals by using scanning electron microscope.