Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1975-11-07
1977-04-26
Emery, Stephen J.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
156DIG85, 23305R, 423 93, 423433, B01J 1704, C01G 2114
Patent
active
040199509
ABSTRACT:
In a hydrothermal process for manufacturing crystals of metal carbonates, including single crystals of lead carbonate of the cerussite crystalline form, the nutrient material consists of a carbonate or basic carbonate of the said metal, the solvent medium consists of a 0.5 to 5.0 molar aqueous solution of an alkali metal bicarbonate, and the heating is carried out in an autoclave under controlled temperature conditions such that the exterior of the autoclave wall adjacent to the nutrient and the solvent medium in the vicinity thereof is maintained at 200.degree. C to 400.degree. C, and that the exterior of the autoclave wall adjacent to the region of the solvent medium remote from the nutrient is maintained at 170.degree. C to 315.degree. C and at a temperature from 5.degree. C to 150.degree. C lower than that of the exterior of the autoclave wall adjacent to the nutrient: a temperature gradient is thus produced in the solvent medium and crystalline metal carbonate is deposited in a region remote from the nutrient, as small crystals on the autoclave wall or as crystal growth on seeds.
REFERENCES:
patent: 1008977 (1911-11-01), Lyon
patent: 1886915 (1932-11-01), Sletzer
patent: 3959453 (1976-05-01), Torikai
Sinclair, Ph.D. Thesis, Carbonate and Bicarbonate Complexes of Lead in Hydrothermal Solutions From 25.degree. to 150.degree. C With Geological Applications, Univ. of Wisconsin, 1973, 122 pages Diss. Abstr. Int. B. 1974, vol. 34, No. 5032.
Croxall Derek Francis
Kell Robert Christopher
Lambert Robert
Emery Stephen J.
The General Electric Company Limited
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