Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1990-03-27
1992-05-19
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210669, 210670, 210677, 210686, 210724, 210726, 210911, 423602, C02F 900
Patent
active
051145928
ABSTRACT:
The invention involves a process as well as apparatus for the separation of arsenic from waste material. The process includes precipitation of arsenic in the form of low solubility calcium magnesium arsenates by adding calcium and magnesium compounds to the waste, separation of calcium magnesium arsenates, putting the waste in contact with an ion exchanger, regenerating the ion exchanger after reaching the charge limit, adsorptively separating the arsenic by putting the waste in contact with active carbon, and separating the charged active carbon by itself or along with precipitation products. The process allows for a separation of arsenic from waste which is hard to be treated or contains heavy metals such as lead or contains sulfates to residual amounts as low as <0.3 mg As/l.
REFERENCES:
patent: 3414512 (1968-12-01), Johnson
patent: 4341636 (1982-06-01), Harder et al.
patent: 4366128 (1982-12-01), Weir et al.
patent: 4566975 (1986-01-01), Allgulin
Chemical Abstract, vol. 97, No. 2, Jul. 12, 1982; "Dearsenization of Wastewater by Oxidation-Precipitation Method," H. Wang et al.
Kaestle Hans
Schuster Georg
Cintins Ivars
Walhalla-Kalk, Entwichlungs- und Vertriebsgesellschaft mbH
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