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Ultrafine grinding of several industrial minerals by the attrition grinding process.

Stanczyk MH; Feld IL

Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 7641, 1972 Jan; :1-25

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10008881

Ultrafine grinding of the industrial minerals, mica, pyrophyllite, talc, marble, barite, and fluorite was accomplished using the Bureau- developed and patented attrition-grinding process. The materials, representing minerals of diverse physical characteristics, were batch ground in a 10-inch-diameter machine using statistically designed experimental test programs. The tests were made to determine large effects of variables such as feed pulp density, grinding medium size, and quantity of the electrical energy consumed during grinding on product particle size and bulk density. In designing the test programs, it was assumed that there was no interaction between the variables. Relatively coarse commercial flotation concentrates of mica, barite, and fluorspar and mine-run products of pyrophyllite, talc, and marble were readily ground into subsieve size ranges. Considering the great amount of particle size reduction obtained, the electrical energy requirements for grinding were very low. In general, the test results indicated that the best conditions for particle size reduction were approached when grinding with the coarser fraction of sand grinding media, the higher sand-to- mineral weight ratio, and the higher feed pulp density. Work done in cooperation with the University of Alabama.

19720101

IH; Report of Investigations

1972

PB-210983

A03

RI-7641

TURC

Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 7641

AL