Iron or aluminum precipitation in strong acid systems

Details Iron or aluminum precipitation in strong acid systems Iron or aluminum precipitation in strong acid systems

1987-06-30

1988-07-19

Garvin, Patrick P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423140, 423DIG2, 75108, 210702, 210729, 210735, C22B 2100

Patent

active

047584149

ABSTRACT:
The precipitation of iron and aluminum from their solutions in strong acids, eg. 18% HCl and 25% H.sub.2 SO.sub.4, is accomplished by adding to the acid solution certain organic aminophosphonic acids in which at least 50% of the amine hydrogens have been substituted with methylenephosphonic acid groups. Particularly preferred compounds are the methylenephosphonic acid derivatives of ammonia and polyalkylenepolyaminepoly(methylenephosphonic acids). The completely phosphonomethylated derivatives are most preferred.

REFERENCES:
patent: 2038078 (1936-04-01), Hardiek
patent: 2726953 (1955-12-01), Roy et al.
patent: 3288846 (1966-11-01), Irani et al.
patent: 3306702 (1967-02-01), Odland et al.
patent: 3779912 (1973-12-01), Redmore et al.
Chem. Abst. 84:83673e.
Chem. Abst. 101:178453s.
Chem. Abst. 100:195666.
Chem. Abst. 102(18):159728q.
"Comparison of the Metal-Binding Properties of Nitrilotri(methylenephosphonic) Acid and Nitrilotriacetic Acid: Calcium (II), Nickel (II), Iron (III), and Thorium (IV) Complexes", Analytical Chemistry by H. S. Hendrickson, pp. 998-1000; vol. 39, No. 8, 1967.

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