Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1974-01-11
1977-05-17
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, 423339, 423264, 106 42, B01J 1704, C01B 3312
Patent
active
040240134
ABSTRACT:
A method of producing citrine crystals comprising the step of growing citrine crystals under hydrothermal conditions by the temperature difference method in a high-pressure autoclave on crystalline quartz seeding plates oriented in parallel with the pinacoid crystallographic plane {0001} or with planes inclined at an angle within the range of up to 20.degree. with respect to said pinacoid plane using a charge comprising crystalline quartz and aqueous solutions of potassium carbonate with a concentration of from 5-10 wt.%. Said solutions contain iron introduced in the autoclave in the form of metallic iron in an amount of from 2-20 g per lit. of the solution, as well as nitrites or nitrates of alkali metals or potassium permanganate which are introduced in the autoclave in an amount of from 1-20 g per lit. of the solution. The above-described method of growing citrine crystals is carried out at a crystallization temperature of from 300.degree.-345.degree. C, under a pressure of from 300-1500 kg/cm.sup.2 and at a rate of from 0.2-1 mm/day. The method according to the invention is characterized by simple production equipment and technological steps, and is reliably reproducable in high-pressure autoclaves having varying capacities. The method yields high-grade citrine crystals having various shades which are intesively colored over the entire volume of the monocrystalline layer grown. Such crystals may be widely used as semiprecious stones in jewelry.
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Khadzhi Valentin Evstafievich
Reshetova Galina Vasilievna
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