Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1978-06-02
1979-05-01
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
423165, 423167, 423319, C01F 1118
Patent
active
041523970
ABSTRACT:
Magnesium-bearing phosphate rock in small grain size is converted into phosphoric acid so that no by-products, which are difficult to dispose of are produced. The crushed rock is mixed with water and subsequently acidified with nitric acid, the reaction product being filtered and washed before the neutralization point is reached. The wet and filtered rock is treated with nitric acid to form phosphoric acid and a slurry of calcium nitrate tetrahydrate. The previously formed filtrate is mixed with the calcium nitrate tetrahydrate slurry and this mixture is reacted with ammonia and carbonic acid to form ammonium nitrate, magnesium carbonate and calcium carbonate, which are then separated into an ammonium nitrate solution and a mixture of magnesium and calcium carbonates.
REFERENCES:
patent: 1816285 (1931-07-01), Johnson
patent: 3382035 (1968-05-01), Slater
patent: 3493340 (1970-02-01), Bosen et al.
patent: 3518071 (1970-06-01), Villiers-Fisher et al.
Holtmeier Ferdinand
Wengeler Wilhelm
Wolstein Friedrich
Fraser Malcolm W.
Langel Wayne A.
Uhde GmbH
Vertiz O. R.
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