非洲某鳞片石墨矿梯级回收工艺研究

Beneficiation of Flake Graphite Ore from Africa for Staged Recovery

以非洲某鳞片石墨为研究对象,开展了不同粒级石墨资源梯级回收工艺研究。结果表明,原矿固定碳含量为32.54%,其中大鳞片石墨主要呈片状或条带状结构与脉石矿物相互交代连生;粗选适宜条件为:磨矿细度-0.074 mm粒级占72.87%,煤油用量50 g/t,2#油用量150 g/t;浮选工艺为一粗一扫四精,其中粗精矿经精选1直接浮选后进行筛分分离出大鳞片石墨,筛下产物依次再进行三次磨矿三次精选获得细鳞片石墨。闭路试验结果显示,精矿中+0.150 mm大鳞片石墨和-0.150 mm细鳞片石墨固定碳含量分别达96.53%和96.21%,其中大鳞片石墨回收率达22.74%,比传统再磨再选工艺提高了7.66个百分点。

With a flake graphite ore from Africa as the raw material,a beneficiation technique was adopted to recover graphite resource according to ore size fraction.The results show that the fixed carbon content of the graphite feed ore is 32.54%,and the large flake graphite mainly in sheet or banded structure is intergrown with feldspar minerals.The optimized roughing condition is determined as follows:grinding fineness of-0.074 mm 72.87%,kerosene dosage of 50 g/t and terpineol dosage of 150 g/t.A flotation process with one stage of roughing,one stage of scavenging and four stages of cleaning is adopted,in which the large flake graphite is screened from the flotation production of the 1st-stage of cleaning,while the undersize is treated further by three stages of grinding and three stages of cleaning to recover fine flake graphite.The closed-circuit test shows that the fixed carbon content in the large flake graphite(+0.150 mm)concentrate and the fine flake graphite(-0.150 mm)concentrate reaches 96.53%and 96.21%,respectively.The recovery rate of the large flake graphite reaches 22.74%,which is higher by 7.66 percentage points compared to that by conventional regrinding⁃separation approach.