Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1986-01-31
1987-11-17
Fisher, Richard V.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210691, 210716, 210723, 210906, B01D 1500
Patent
active
047072709
ABSTRACT:
The specification discloses a novel calcium silicate water-treating agent exhibiting a superior ability to remove various kinds of phosphorus compounds or other environmental pollutants contained in wastewater, the calcium silicate water treating agent comprising a burned product which is prepared by burning a mixture containing as main constituents calcium compound, thermally decomposable to calcium oxide (CaO), and SiO.sub.2 -containing compound at a temperature of 1300.degree. to 1600.degree. C., the molar ratio of CaO/SiO.sub.2 of the resultant burned product being in the range of 1.5 to 5.0, preferably 2.0 to 4.0. In this water treating agent, SiO.sub.2 component may be partially replaced by Al.sub.2 O.sub.3 and/or Fe.sub.2 O.sub.3. A further water treating agent is prepared by heating the hydrate of the burned product prepared above at a temperature of 50.degree. to 700.degree. C. By using the thus obtained water treating agents, water treatment can be carried out with a high efficiency, thereby the treatment time, labor and cost can be considerably saved.
REFERENCES:
patent: 4301014 (1981-11-01), Buckholtz et al.
patent: 4395357 (1983-07-01), Kramer et al.
patent: 4402833 (1983-09-01), Bennett et al.
Encylopedia of Chemical Technology, 3rd edition, vol. 5, John Wiley & Sons, N.Y., 1979, pp. 180-193.
Vinyard, D. L., "High-Calcium Fly Ash for Tertiary Phosphorous Removal", Water and Sewage Works, Jun. 1979, pp. 62-64 and 104.
Hirosawa Kozo
Kobayashi Waichi
Sadatani Tetsuya
Usui Koji
Fisher Richard V.
Peterson Jeffrey W.
Ube Industries Ltd.
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