Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1977-10-12
1978-10-10
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
209 39, 423170, C01F 1146
Patent
active
041197003
ABSTRACT:
A new simplified process is described for producing pharmaceutical barium sulphate in which the barium sulphate does not require dissolution for purification. The new process comprises grinding a naturally occurring barite ore containing individual crystals of substantially pure barium sulphate together with gangue minerals to form a finely divided particulate ore material, passing this finely divided ore through a high intensity wet magnetic separator to remove magnetic particles, leaving a non-magnetic fraction containing barium sulphate and low specific gravity minerals, subjecting the non-magnetic fraction to gravity separation to separate a substantially pure barium sulphate fraction, subjecting this barium sulphate fraction to further grinding in an attrition mill with a particulate grinding medium which is non-contaminating of the pure barium sulphate to form a finely divided barium sulphate having a maximum particle size in the order of about 1 micron, leaching the barium sulphate fraction with sulphuric or hydrochloric acid to remove acid soluble impurities and washing the leached product.
REFERENCES:
patent: 1533779 (1925-04-01), Washburn
patent: 2159909 (1939-05-01), Price
patent: 2847169 (1958-08-01), Hartman
patent: 3008656 (1961-11-01), Weston
Lawuer et al., "West Magnetic Separation of Weakly Magnetic Particles", Minerals Sci. Engrg, vol. 6, No. 3 (Jul. 1974).
Sherman, "Sink-Float Processes", Chemical Engineering (Jan. 1949), pp. 106-115.
Langel Wayne A.
Vertiz O. R.
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