Compositions: coating or plastic – Coating or plastic compositions – Proteinaceous material containing
Patent
1978-08-28
1979-07-24
Poer, James
Compositions: coating or plastic
Coating or plastic compositions
Proteinaceous material containing
423171, 423555, C04B 1100
Patent
active
041621700
ABSTRACT:
A combined method for granulation and defluoration of phosphogypsum, suitable for subsequent fluidized bed disassociation to lime and sulphur dioxide is described. The new phosphogypsum, obtained from phosphoric acid production, containing residual combined fluorine, is dried to reduce its residual water. It is moistened with sulfuric acid and aqueous solutions of binding agent additives and then granulated. The granules are heat-treated at temperatures between 170.degree. C. and 700.degree. C. During the heat treatment the residual fluorine residue is volatilized and the granules increase in strength sufficient for use in subsequent fluidized bed treatments.
REFERENCES:
patent: 2230211 (1941-01-01), Dailey
patent: 3547581 (1970-12-01), Gauster et al.
Bakalova Yovka P.
Dombalov Ivan P.
Grancharov Ivan N.
Pelovski Yoncho G.
Tudjarova Fanka D.
Poer James
Ross Karl F.
Vish Chimiko-Technologicheski Institute
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