锡石多金属硫化矿微波辅助磨矿机理研究

Study on Microwave-assisted Grinding Mechanism of Cassiterite-polymetallic Sulfide Ore

以锡石多金属硫化矿作为研究对象,通过微波加热预处理矿石,考察矿石预处理前后和不同冷却方式对磨矿产品可磨度等指标的影响。结果表明,经微波加热预处理后,矿石可磨度提高,邦德功指数下降。这是因为微波辐射致使锡石多金属硫化矿中的脆硫锑铅矿、黄铁矿、闪锌矿、锡石等金属矿物温度升高,而脉石矿物升温并不明显,致使金属矿物和脉石的温度梯度大,产生不均匀热膨胀,导致在矿石内部出现应力集中对矿物与脉石产生破坏,强化锡石多金属硫化矿磨矿效果。

Taking cassiterite polymetallic sulphide ore as the research object,the effects of preheating and different cooling methods on the grindability of grinding products were investigated after pretreatment of microwave heating.The results showed that after microwave heating,the grindability increased and the Bond work index decreased.This is mainly due to the fact that the microwave radiation increases the temperature of the metal minerals such as jamesonite,pyrite,sphalerite,cassiterite,etc.in the cassite polymetallic sulfide ore,and has less effect on the gangue minerals.The large temperature gradient between the metallic metal minerals and gangue minerals could produce uneven thermal expansion and promote the dissociation of metallic minerals and gangue minerals due to the high stress concentration inside the ore,thereby strengthening the grinding effect.