Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1979-07-06
1981-07-07
Caroff, Marc L.
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 10, 134 22R, 134 28, 134 30, 134 41, B08B 308
Patent
active
042772893
ABSTRACT:
A process for cleaning the walls of heat exchangers or reactors which are covered with essentially titaniferous incrustations but which can also contain silico-aluminous incrustations formed during the attack of ores and causing a considerable reduction in the heat exchange capacity, the said process being intended to restore the fundamental characteristics of the said walls, which is characterized in that the incrustations are removed by means of an aqueous treatment liquor containing from 3 to 30% by weight of hexafluosilicic acid and at most 10% by weight of hydrofluoric acid. The aqueous treatment liquor can contain a corrosion inhibitor and the treatment can be carried out at a temperature between 20.degree. C. and 80.degree. C.
REFERENCES:
patent: 2711364 (1955-06-01), Beach
patent: 3010854 (1961-11-01), Satterfield
patent: 3514407 (1970-05-01), Missel
patent: 3562013 (1971-02-01), Mickelson et al.
patent: 3725224 (1973-04-01), Kendall
patent: 3753776 (1973-08-01), Winkhaus et al.
patent: 3891456 (1975-06-01), Hohman et al.
Lectard Alain
Magrone Robert
Aluminum Pechiney
Caroff Marc L.
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