摘要
针对天然优质的硅藻土资源逐渐减少而需求量逐年增加的现状,提出一种适用于工业化生产的用离心选矿机提纯硅藻土的方法。探讨了离心选矿机的圆筒锥角、圆筒转速、给料浓度、给料量和给料时间对硅藻土分选的影响,并通过响应面试验研究了这些因素之间的相关性,进一步优化了离心分选机的工况。结果表明:给料量对精矿SiO2含量和尾矿浓度的影响均较大;当离心选矿机的圆筒锥角为0.5°、转速为856r/min、给料浓度为24.66%、给料量为14L/min、给料时间为90s时,精矿SiO2含量为87.5%,尾矿浓度为6.98%。对最优组合进行了连续分选试验,得到精矿中含SiO2为87.61%、尾矿浓度为6.14%。硅藻精土通过SEM分析发现,硅藻壳体的孔隙堵塞得到明显改善;经图像分析仪检测,硅藻土矿经过中试线选矿后,硅藻破损率变化小于5%。论文的结论为硅藻土生产线的设计、生产和设备操作提供了理论指导。
Considering the situation that the natural quality resources are gradually decreasing but the demand is increasing year by year, this paper presents an industrialized beneficiation method for diatomaceous earths which is based on the size difference between the diatom and the impure minerals, the coarse class of the scoured diatomite ore slurry is wiped out by sieving, the rest slurry is purified by the centrifugal separator. The effects of the cone angle, drum speed, feed concentration, feed flow rate and feed time on the diatomite beneficiation are investigated, and the correlation of these factors is analyzed through the Response Surface Experiment design to further optimize the working conditions of the centrifugal separator. The results show that the feed flow rate has much influencing on the SiO2 content in the diatomite concentrate and the tailings concentration,and that the SiO2 content in the diatomite concentrate is 87.5%, the tailings concentration is 6. 98% when the cone angle is 0. 5°, the drum speed is 856r/min, the feed concentration is 24. 66%, the feed flow rate is 14L/min and the feed time is 90 seconds. The continuous pilot-scale experiment with the optimal combination above has the results that the SiO2 content in the diatomite concentrate is 87.61% and the railings concentration is 6.14%. The SEM picture of the diatomite concentrate shows he blocked pores with some deposited impurities are mostly cleaned. And the analysis with the JX-2000 image analyzer indicates the change of diatom damage rate is below 5% after the diatomite ore is processed by the pilot-scale experiment line. The research achievements provide the theoretical guidance for the design, production and machine operation of the diatomite preparation plant.
出处
《中国矿业》
北大核心
2013年第10期91-95,99,共6页
China Mining Magazine
基金
国家"十二五"科技支撑计划项目资助(编号:2011BAB03B07)
关键词
硅藻土
提纯
离心选矿机
响应面试验
diatomaceous earth
purifying
centrifugal separator
response surface experiment
