Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1976-04-21
1977-05-03
Emery, Stephen J.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
23300, 23301, 106 42, 252 629, 423264, 423339, B01J 1704, C01B 3312
Patent
active
040212947
ABSTRACT:
A process for producing amethyst crystals involving growing of colorless quartz crystals by a hydrothermal method of a temperature drop in a high-pressure autoclave on crystalline quartz seed plates oriented parallel to the crystallographic planes of the major {1011} and minor {1101} rhombohedrons using crystalline quartz as a charge. Said growing is effected from aqueous solutions of potassium carbonate or potassium hydroxide having a concentration ranging from 4 to 7 wt.% and containing iron introduced into the autoclave in the form of metallic iron or in the form of its oxydic or hydroxydic compounds in an amount ranging from 5 to 30 g/l of the solution. The growing process is effected at a crystallization temperature within the range of from 300.degree. to 500.degree. C. under a pressure ranging from 200 to 1,700 kg/cm.sup.2 and a crystal growth rate of from 0.05 to 0.5 mm/day. It is advisable to introduce into the autoclave, prior to the crystal growing, lithium nitrite or lithium nitrate or manganese nitrate in an amount ranging from 1 to 10 g/l of the solution. The thus-grown colorless quartz crystals are exposed to an ionizing irridation. The process for growing crystals according to the present invention is well-reproducible, since it is performed at specfied physico-chemical parameters. The process of the present invention enables the production of amethyst crystals with a high color purity and a high transparency (i.e., with no cracks).
REFERENCES:
patent: 3356463 (1967-12-01), Ballimbu
patent: 3832146 (1974-08-01), Bresnahan
patent: 3936276 (1976-02-01), Balitsky
Tzinober et al., Synthetic Amethyst Quartz, Crystallography, vol. 4, No. 4, pp. 593-595, 1959.
White, The Synthesis and Uses of Artificial Gemstones, Endeavour, Apr. 1962, pp. 73-84.
Laudise et al., Pilot Plant Production, Synthetic Quartz, Chem. Eng. Prog., vol. 55, No. 5, May, 1959, pp. 55-59.
Brown et al., The Gr. prop. of Lg. Cryst. of Syn. Quartz, Mineralogical Magazine (London), vol. 29, No. 217, June 1952, pp. 858-874.
Brown et al., Resp. of Syn. Quartz to X-Ray Irrad., Nature, No. 4288, Jan. 5, 1952, pp. 35-36.
Butuzov Vladimir Petrovich
Khadzhi Valentin Evstafievich
Lelekova Margarita Vladimirovna
Novozhilova Zhanneta Viktorovna
Reshetova Galina Vasilievna
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