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Pneumatic Beneficiation of Mica.
Proc 14th Int'l Miner Proc Cong on Worlwide Ind Applic of Min Proc Tech Pp V6 1-v6 19 :V6.1-v6.19
The Bureau of Mines has conducted research into the pneumatic recovery of coarse mica pursuant to its objective of devising technology that will help maintain an adequate supply of minerals and metals to meet national economic and strategic needs. The pneumatic beneficiation technique may be advantageous in areas where water resources are limited. Researchers used a Bureau-designed system of crushers, screens, and zigzag air classifiers to concentrate coarse liberated mica particles from mica-bearing materials. A hammer mill, modified by removing 70 of its 80 free- swinging hammers and the crushing screen, proved effective for crushing and delaminating the mica without overgrinding. This pneumatic system was used to concentrate mica ores from Arizona, North Carolina, and South Dakota and waste tailings from Alabama, Georgia, and South Dakota. Using these samples, it was demonstrated that plus 0.21-Millimeter-size mica can be effectively recovered by the pneumatic method. Mica concentrates containing more than 90 percent mica were produced with attendant recoveries of up to 78 percent.
Proc. 14th Int'l Miner. Proc. Cong. on Worlwide Ind. Applic. of Min. Proc. Tech., Pp V6.1-v6.19
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Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division