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INVENTION
Patent of the Russian Federation RU2178019
A METHOD FOR OBTAINING QUARTZ CRYSTAL PAINTS
Applicant's name: All-Russian Scientific Research Institute for Synthesis of Mineral Raw Materials
The name of the inventor: Stepanova TA; Sopeeleva EG; Mareeva TV; Mukhanova NG; Maryin AA; Shishminov A.V.
The name of the patent holder: All-Russian Scientific Research Institute of Synthesis of Mineral Raw Materials
Address for correspondence:
Date of commencement of the patent: 2000.04.24
The invention relates to a technology for producing colored quartz crystals and can be used in the jewelry industry. SUMMARY OF THE INVENTION: The method is carried out under hydrothermal conditions, by the temperature drop method, by recrystallization of the quartz charge to a seed from an aqueous solution of sodium carbonate in the presence of a cobalt-containing compound and aluminum in a solution with the following content of elements: Co (0.1-0.2) · 10 -3 G / l, Al (3.0-6.0) · 10 -3 g / l, followed by ionizing radiation. The invention makes it possible to grow colored quartz crystals in color, close to "sapphire".
DESCRIPTION OF THE INVENTION
The invention relates to a technology for producing colored quartz crystals and can be used for hydrothermal growth of quartz single crystals in color close to "sapphire", which can be used in the jewelry industry.
A method for growing crystals of quartz of blue color is known (author of the Czechoslovakia 153359, MCI: B 01 J 17/02, priority 29.10.70) by the hydrothermal method, when using as a transport medium a solution of a carbonate or an alkali metal hydroxide, with the addition of a solution NaCl, and the coloring additive, solid cobalt oxide, is introduced into the system, mixing it with a solid phase. However, this method does not allow obtaining the desired coloration, close to "sapphire".
The closest technical solution to the invention according to the technical essence and the result achieved with its use is the method for producing colored quartz crystals (author of the USSR 1834922, MKI: C 30 V 7/10, 29/18, priority 1, 10.91) , where Quartz crystals of blue-green color are obtained by hydrothermal method from an aqueous solution of sodium carbonate with iron impurities and K 2 CO 3 , and adding 0.02-2.00 g / l of cobalt oxide to the seed. This method does not allow to obtain a wide range of colored quartz, bringing it closer to a commercial shade in color, close to the "sapphire" used in the jewelry industry.
It is a technical object of the invention to grow colored quartz crystals in color close to "sapphire" in order to expand the color gamut of colored quartz crystals for the jewelry industry.
The technical problem is solved due to the fact that the growth of colored quartz crystals of "sapphire" color is carried out under hydrothermal conditions by the temperature drop method, by recrystallization of the quartz charge to a seed from a solution of sodium carbonate in which, together with the cobalt-containing compound, an addition of aluminum is additionally introduced with the following content of the elements: Co - (0.1-0.2) · 10 -3 g / l, Al - (0.3-6.0) · 10 -3 g / l, followed by ionizing irradiation of grown crystals.
Comparative analysis of the proposed invention with the prototype shows that the claimed method differs from the known method in that an addition of aluminum is added to the hydrothermal solution in addition to the cobalt-containing compound at the following content of the elements: Co - (0.1-0.2) · 10 -3 g / l , Al - (3,0-6,0) · 10 -3 g / l with the subsequent ionizing radiation. Thus, the claimed method corresponds to the criterion of the invention "novelty". The combined presence of additives, cobalt and aluminum compounds in the hydrothermal solution of sodium carbonate, allows the growing of colored quartz crystals in color close to "sapphire". The optimal concentration of elements in the hydrothermal solution, namely Co - (0.1-0.2) · 10 -3 g / l and Al - (3.0-6.0) · 10 -3 g / l is determined experimentally .
These combinations of additives allow you to adjust the desired shades and bring them closer to a commercial shade (in color, close to "sapphire"). An increase in the concentration of aluminum in the hydrothermal solution above this limit adversely affects the very process of quartz synthesis, namely, the degeneration surfaces appear, the properties under irradiation change, and quartz acquires a highly smoky color. The aluminum content below the specified limits does not ensure the production of (consumer) commercial color. Increasing the cobalt content in Na 2 CO 3 solutions above the limit does not provide the desired color tone of the "sapphire" color. Likewise, a decrease in the concentration of cobalt in the solution below these limits provides a mild blue color or leads to a nearly colorless quartz. In all these cases, the consumer properties of grown crystals, and consequently, the demand for them is reduced. The subsequent ionizing irradiation gives an approximation of the color of the blue quartz to the required gamma.
Example of specific implementation
The crystals of colored "sapphire" quartz were grown in an autoclave of 750 liters, in a 10% aqueous solution of Na2CO3 at a temperature of 300 ± 2 ° C and a pressure of 390 atm, with a temperature drop of 32 ± 2 ° C. The bottom zone of the autoclave was placed Quartz charge. The crystals were grown on quartz primers of basic orientation. Additives were added to the hydrothermal solution: a cobalt compound, for example Co 3 O 4, in terms of Co - (0.1-0.2) · 10 -3 g / l and aluminum in the form of chips in terms of Al - (3.0 -6.0) · 10 -3 g / l. The autoclave was sealed, put into operation, and a crystal growth cycle was carried out, which was then subjected to ionizing irradiation. As a result, crystals of the necessary commercial color of the "sapphire" color were obtained. The results of the experiments carried out in accordance with the above example, changing the ratio of the additives, are summarized in the table.
By this method, colored quartz crystals of specified shades are obtained, approaching a commercial shade close to "sapphire", which allows to expand the color spectrum of the colored quartz crystals used in the jewelry industry.
CLAIM
A method for producing colored quartz crystals under hydrothermal conditions by the temperature difference method by recrystallization of the quartz batch into a seed from an aqueous solution of sodium carbonate in the presence of a cobalt-containing compound, characterized in that aluminum is added to the solution in addition to the cobalt-containing compound at the following content of elements: Co (0.1-0 , 2) · 10 -3 g / l, Al (3,0-6,0) · 10 -3 g / l with the subsequent ionizing radiation.
print version
Date of publication 03.01.2007gg
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