Process for reducing the grain size of phosphate rock

Details Process for reducing the grain size of phosphate rock Process for reducing the grain size of phosphate rock

1977-04-04

1978-09-26

Custer, Jr., Granville Y.

Solid material comminution or disintegration

Processes

With classifying or separating of material

241 81, B02C 2314

Patent

active

041163907

ABSTRACT:
Freshly mined phosphate rock is subjected to screen classification in at least two stages. Only coarse grained phosphate rock with a grain size over 2 mm from the last screen classification step is fed to a plain-roller grinding mill. The rollers of the grinding mill run at different peripheral speeds, so that the grains are ground by radial and tangential forces. This produces a fine grained phosphate rock whose natural moisture content is advantageous when further processed to phosphoric acid by means of sulphuric acid.

REFERENCES:
patent: 364984 (1887-06-01), Barnard
patent: 1349221 (1920-08-01), Nolen
patent: 2174116 (1939-09-01), Bilocq
patent: 2343270 (1944-03-01), Agnew
patent: 2987263 (1961-06-01), Senn

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