Method of providing silver on calcium carbonate material such as

Details Method of providing silver on calcium carbonate material such as Method of providing silver on calcium carbonate material such as

1991-03-20

1992-12-08

Beck, Shrive

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427343, 4273833, 4274431, 4274432, 75636, B05D 724

Patent

active

051696827

ABSTRACT:
A method of providing silver on a calcium carbonate material having fine pores, such as coral sand, oyster shells, and crab shells, including (a) contacting a calcium carbonate material with an aqueous solution of silver nitrate for a time effective for the silver nitrate to react with the calcium carbonate to form silver carbonate on the surface of the calcium carbonate material; (b) dewatering the calcium carbonate material after step (a); and (c) treating the calcium carbonate material after step (b) in an aqueous solution containing from 5 to 15 weight % of a reducing agent selected from the group consisting of ascorbic acid, a derivative of ascorbic acid, erythrobic acid, and a derivative of erythrobic acid to reduce the silver carbonate on the surface of the calcium carbonate to silver. Preferably contacting is by injection of an upward stream of the aqueous solution of silver nitrate through a layer of the calcium carbonate material. Instead of or in addition to employing a reducing agent, the silver carbonate may be reduced directly by uniformly heating the calcium carbonate material after step (b) at a temperature of at least 200.degree. C., and preferably at a temperature ranging from 300.degree. to 400.degree. C.

REFERENCES:
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patent: 4045553 (1977-08-01), Mitsumori et al.
patent: 4078918 (1978-03-01), Perman
patent: 4201875 (1980-05-01), Wu et al.
patent: 4407865 (1983-10-01), Nice
patent: 4463031 (1984-07-01), Someya
patent: 4652465 (1987-03-01), Koto et al.
patent: 5045349 (1991-09-01), Ferrando

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