C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
71/28, 23/76
C01B 25/22 (2006.01) C01B 25/234 (2006.01) C01B 25/46 (2006.01) C05B 11/08 (2006.01)
Patent
CA 1084240
Abstract of the Disclosure In the process according to the invention, raw phosphate rock is decomposed with a aqueous solution of sulphuric acid and ammonium sulphate recycled from the conversion step of phospho-gypsum into chalk, and then the decomposition liquor stream is divided into a partial acid plant stream /Liquor I/ to be converted into phosphoric acid and a partial fertilizer plant stream /Liquor II/ to be processed to a multi-component mineral fertilizer. From the acid plant stream /Liquor I/ con- stituting up to 30 per cent by weight of total decomposition stream, ammonium sulphate is precipitated and introduced into the fertilizer plant stream /Liquor II/, all the above mentio- ned processes or decomposition, separation and precipitation being carried out in continuous way. Another embodiment of the process according to the inven- tion, wherein the partial acid plant stream /Liquor I/ consti- tutes a partial phosphate plant stream; the acid stream compri- sing aqueous-solvent phosphoric acid solution after precipita- tion of impurities is neutralized with ammonia, alkali metal hydroxides or alkali metal carbonates to yield crystalline phosphate salts of high purity and a homogenous mixture of organic solvent and water which may be easily separated by distillation.
244355
Gorecki Henryk
Hnatowicz Roman
Schroeder Jerzy
Synowiec Jerzy
Wolnicki Zdzislaw
Fetherstonhaugh & Co.
Przedsiebiorstwo Projektowania I. Dostaw Kompletnych Obiektow Pr Oddzial W. Krakowie
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