膜技术在铜钼分选中的运用研究

【作者】 龚达盛；

【导师】 黄万抚；

【作者基本信息】 江西理工大学 ， 环境工程， 2008， 硕士

【摘要】 我国共伴生矿产资源综合利用率不到20%,矿产资源总回收率只有30%,而国外先进水平均在50%以上,差距分别为30和20个百分点,如何有效地降低消耗的同时提高矿产资源回收率是摆在我们面前急需解决的难题之一。本文研究了以膜技术为手段,以铜钼分离浮选为研究背景,针对浮选前旋流器溢流液以及旋流器给矿中钼的回收进行了有益的探讨,分别确定了在采用膜技术处理旋流器溢流液、旋流器给矿的最佳压力、膜通量的变化规律以及膜组件浓缩分离时间,并就采取膜技术与不采用膜技术两种工艺下对浮选药剂量的需求、钼粗精矿的品位和钼的回收率进行了比较试验。研究结果表明:采用膜技术对旋流器溢流液中钼的回收时,膜组件的运行压力在20KPa时为宜,膜通量下降的速率逐渐减小并在500mL/min时达到稳定,在膜组件运行180min时溢流液的浓度可达到50%;在运用膜技术对旋流器溢流液进行浓缩分离后,其铜钼浮选分离所需的Na2S用量可以大幅降低,同时钼粗精矿的品位、钼的回收率皆有不同程度的提高,试验还表明运用:膜技术—硫化钠脱药—浮选,这一工艺时药剂用量最小,钼的品位、回收率最高。采用膜技术对旋流器给矿中钼的回收时,膜组件的运行压力在30KPa时为宜,膜通量下降的速率逐渐减小并在600mL/min时达到稳定,在膜组件运行60min时溢流液的浓度可达到60%以上,在采用膜技术后对药剂的用量、钼粗精矿品位和钼的回收率也有相同的结论。通过粒度分析表明,旋流器溢流液通过膜浓缩分离后,其颗粒尺寸分布明显变窄,主要颗粒尺寸由6.1μm提高到8.7μm,旋流器给矿颗粒粒径则在11μm。这说明钼品位和回收率的高低与颗粒的粒径大小有着很大的关系。更多还原

【Abstract】 China has comprehensive utilization of mineral resources associated with less than 20 percent, total recovery of mineral resources, only 30 per cent, while foreign advanced water in more than 50 per cent on average, the gap was 30 and 20 percentage points, how to effectively reduce the consumption of mineral at the same time improve Resource recovery is one of the urgent need to resolve problems before us.In this paper, a membrane technology as a means to flotation for copper and molybdenum separation research background, in view of flotation of the former Cyclone and Cyclone overflow to the recovery of molybdenum ore a useful discussion were identified in the film taken technology cyclone overflow liquid cyclone to mine the best pressure, the changes of flux concentration, as well as membrane separation time, and on the adoption of membrane technology and do not use membrane technology for two of the flotation reagent in the demand for crude molybdenum and molybdenum concentrate grade of the recovery test were compared.Using membrane of the cyclone overflow in the recovery of molybdenum, the operating pressure in the membrane 20 KPa when suitable, the rate of decline in flux gradually decreased and 500 mL/min to achieve stability in the module running 180 min When the concentration of liquid overflow could reach 50% in the use of membrane technology for cyclone overflow of enrichment after the separation of its flotation separation of copper and molybdenum Na2S required dosage can be reduced substantially, while molybdenum concentrate rough grade, Mo varying degrees of recovery both increased use of tests also showed that: membrane technology - from drug sodium sulfide - flotation, this process when the smallest amount of Pharmacy, molybdenum grade, the highest recovery.Using membrane of the cyclone to mine in the recovery of molybdenum, the operating pressure in the membrane 30 KPa when suitable, the rate of decline in flux gradually decreased and 600 mL/min to achieve stability in the module running 60 min overflow when the concentration of more than 60% can be achieved in the use of membrane technology for pharmaceutical dosage, molybdenum concentrate rough grade and the recovery of molybdenum have the same conclusion.Through particle size analysis shows that cyclone overflow condensed liquid membrane separation through after its apparent narrow particle size distribution, particle size from 6.1μm raised to 8.7μm, cyclone to mine the particle size in 11μm. This shows that the recovery of molybdenum grades and the level of the particle size and particle has a great relationship.更多还原