Wet grinding phosphate rock in an acidic slurry

Details Wet grinding phosphate rock in an acidic slurry Wet grinding phosphate rock in an acidic slurry

1984-08-07

1986-03-25

Goldberg, Howard N.

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 21, 241 30, 423167, 423320, B02C 2336

Patent

active

045778043

ABSTRACT:
Phosphate rock contained in an acidic slurry is ground by equipment wherein the acidic slurry contacts the metallic surfaces of the equipment. A method for monitoring and controlling grinding ball consumption is provided in which acid-neutralizing particulate iron contained in the acidic slurry is measured and correlated to control curves, which relate particulate iron concentration to slurry pH and slurry pH to the rate grinding ball consumption. If the measured particulate iron concentration equates to an unacceptable ball corrosion rate, the equilibrium of the slurry pH and particulate iron concentration can be varied to maintain a predictable ball consumption. When making the slurry, waste water from other steps of the wet process manufacture of phosphoric acid can be used as part of an acidic diluting medium.

REFERENCES:
patent: 3699212 (1972-10-01), Palm
patent: 4044107 (1977-08-01), Houghtaling
patent: 4402923 (1983-09-01), Lang
An Article, Productions of Wet-Process Phosphoric Acid, by T. P. Hignett.
W. R. Parish and J. V. Galluzzo, "A Concept for Wet Grinding Using Pond Water", May 1981.

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