Process for the separation of heavy metals from waste materials

Details Process for the separation of heavy metals from waste materials Process for the separation of heavy metals from waste materials

1990-01-09

1991-04-23

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210717, 210721, 210722, 210724, 210726, 210912, 210913, 423 43, 423 50, 423 55, 423 92, 423105, 423140, 423419R, C02F 152, C02F 172

Patent

active

050097938

ABSTRACT:
A process for the heavy-metal decontamination of contaminated substances such as natural and industrial sludges, thermal residues and soils. The contaminated starting substance is treated with an acid and the dissolved metal salts are precipitated as metal hydroxides in the pH range of about 3.5-11. The exact control of the pH value makes it possible to isolate individual metal fractions which can be used as raw materials in the metallurgical industry.

REFERENCES:
patent: 3800024 (1974-03-01), Forsell et al.
patent: 4018680 (1977-04-01), Kupfer
patent: 4025430 (1977-05-01), Pagel
patent: 4321149 (1982-03-01), Hawxhurst et al.
patent: 4338200 (1982-07-01), Zeijlstra
patent: 4419246 (1983-12-01), Jayawant
patent: 4680126 (1987-07-01), Frankard et al.

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