高压辊终粉磨条件下含铜银多金属矿的分选及其机理研究

Research on Separation of Copper-silver Polymetallic Ore by HPGR Final Grinding System and Its Mechanism

武平某含铜银多金属矿铜品位为0.24%、银品位为85.00 g/t。分别对采用常规碎磨流程和高压辊终粉磨流程获得的产品进行浮选条件试验,在各自最佳的条件下进行铜银混合浮选—混合精矿铜银分离浮选闭路试验。结果表明,高压辊终粉磨产品的选矿指标优于常规碎磨产品。分别采用最小二乘法拟合常规碎磨产品和高压辊终粉磨产品的粒度分布曲线和金属量分布曲线,结果表明：高压辊终粉磨产品的适合浮选粒级产率、易回收粒级金属量分布率均大于常规碎磨产品;高压辊终粉磨产品的粒度分布方差与金属量分布方差均远小于常规碎磨产品。采用MLA矿石自动分析仪测定矿物单体解离度,结果表明,高压辊终粉磨产品中0.01~0.1 mm的易浮选粒级单体解离度远高于常规碎磨产品。因此,高压辊终粉磨产品选矿指标优于常规碎磨产品。试验结果为选矿领域降低磨矿作业能耗提供了一种新的思路和方法。

There is 0. 24% copper and 85. 00 g / t silver in a copper silver polymetallic ore from Wuping. On the basis of flotation conditioning experiments on conventional crushing-grinding process（ CCG） products and final high pressure grinding roller（ HPGR） grinding system products respectively,closed-circuit flotation tests were conducted at optimum copper and silver bulk flotation-separation of copper from silver conditions,respectively. Results indicated that,beneficiation index on final HPGR grinding system is better than that of CCG. Particle size distribution curve and metal volume distribution curve for both CCG process and final HPGR grinding system were analyzed by least square method. Results indicated that final HPGR grinding system products were higher than that of CCG process in the yield of suitable flotation fraction and easily to be recycled metal quantity; variance on particle size distribution and metal quantity distribution of final HPGR grinding system is much smaller than that of CCG process. Liberation degree of valuable minerals analyzed by MLA（ Mineral Liberation Analyzer） show that： liberation degree of suitable flotation fraction（ 0. 01 ~ 0. 1 mm） by final HPGR grinding system is much higher than that of CCG process. Thus,separation indexes of final HPGR grinding system is much better than the CCG process. The experiments results provide a new clue or method for reduce energy consumption of grinding in mineral processing fields.