Classifying – separating – and assorting solids – Plural – diverse separating operations – Including electrostatic
Patent
1976-07-21
1979-05-29
Halper, Robert
Classifying, separating, and assorting solids
Plural, diverse separating operations
Including electrostatic
209166, 209211, B03B 700
Patent
active
041566432
ABSTRACT:
A concentrated calcium fluoride ore, having a decreased foam value which is particularly adapted for the manufacture of hydrogen fluoride is provided by a process which comprises: (a) grinding calcium fluoride ore containing calcite and quartzite particles to form calcium fluoride particles and to liberate at least a portion of said calcite and quartzite particles; (b) admixing the ground ore with aqueous medium and an effective amount of a suitable flotation agent to form a first aqueous slurry containing said flotation agent and calcium fluoride, calcite and quartzite particles; (c) contacting said first aqueous slurry with a gas under conditions sufficient to produce (i) a foam containing a major portion of said flotation agent and foamed particles comprising calcium fluoride particles together with a minor portion of the calcite and quartzite particles in said first slurry, and (ii) separated solids containing a major portion of the calcite and quartzite particles in said first slurry; (d) recovering at least a portion of said foam containing said foamed particles and said flotation agent portion as a second aqueous slurry; (e) removing from said second slurry a major portion of said foamed particles having a particle size of less than about 10 microns, thereby producing a thickened aqueous slurry containing calcium fluoride particles; and (f) recovering calcium fluoride particles from said thickened aqueous slurry as product.
REFERENCES:
patent: 2615572 (1952-10-01), Hodge
patent: 2849930 (1958-09-01), Freeman
patent: 2936887 (1960-05-01), Wilson
patent: 2982409 (1961-05-01), Boadway
patent: 3331505 (1967-07-01), Mercade
patent: 3428175 (1969-02-01), Hukki
patent: 3430763 (1969-03-01), Iwasaki
patent: 3430765 (1969-03-01), Allen
patent: 3635337 (1972-01-01), Mercade
Bean Samuel L.
Buckman Walter R.
Allied Chemical Corporation
Halper Robert
Stewart Anthony J.
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