C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
117/71
C23F 11/18 (2006.01) C02F 5/08 (2006.01)
Patent
CA 1250493
ABSTRACT OF THE DISCLOSURE. The present invention relates to a method for obtaining a tenacious in-situ coating deposition of calcite on the inner surface of water pipes at very high rates. The calcite producing ingredients are supplied to the water stream in quantities supplementing concentrations available in the natural water used, giving the required supersaturation levels by addition of suitable salts to provide an aqueous lining solution supersaturated with respect to calcium carbonate containing dissolved calcium and carbonate ions. The method consists in maintaining the suspended calcium carbonate particles concentrations in the lining solution below 300 ppm, the excess suspended particles being removed by physical means. The calcite coating deposition according to the present invention has the advantage that it occurs at the rate of above 5 microns/h and even above 50 microns/h, maintaining a completely corrosion-free system during the coating. The method is applicable to lead pipes, cement mortar linings or asbestos pipes.
492246
Hasson David
Karmon Mordechai
Mekoroth Water Co.
Sim & Mcburney
Technion Research & Development Foundation Ltd.
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