Beneficiation of Flake Graphite Ore from Africa for Staged Recovery
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.
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