JPS6096522A - Preparation of jadeite crystal - Google Patents

Abstract

PURPOSE:To prepare jadeite crystal efficiently, by sintering a raw material containing a sodium component, an aluminum component, a silicon component, an oxygen component, and an iron component in a specific ratio at high temperature at high pressure in a gas atmosphere or in vacuum. CONSTITUTION:Na2O is blended with Al2O3, SiO2 and Fe2O3 to give a raw material contqining 1mol Na, 1mole Al, 2mol Si, 6mol O, and 0.01-0.1mol Fe, which is molded into a proper shape. This molded article is sintered by the use of HIP at high temperature at high pressure in a gas atmosphere or in vacuum. Consequently, translucent crystal consisting only of jadeite is obtained in high sintering density.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a method for producing dieidite crystals.

(Prior art) Conventionally, jadeite (NaAtBi206), nefeline (NaAIEJi04), albite (NcL
kl Sis Os), and it was difficult to produce a product containing only dieidite.

(Objective of the present invention) An object of the present invention is to solve the above-mentioned problems and provide a method for efficiently producing jadeite crystals.

(Summary of the Invention) In the present invention, a raw material having a molar ratio of Na AI S 1xoa and 0.01 to 0.1 mole of iron added thereto is heated at high temperature, high pressure, in a gas atmosphere, or in a vacuum. NcLMS
Promotes the reaction that forms i20a. ■By accelerating sintering, the sintered density is increased and translucent jadeite is obtained, making it possible to obtain jadeite crystals.

Example 1 Sodium oxide (N(Z20) 15.4wt, aluminum oxide i=ub (ktzos) 25.2wt, silicon oxide (fMOz)'r59.4w%, iron oxide (F20++) 01-1tI) and mold the mixed raw materials into a suitable shape. Set this to HIP. H
IP is a device that uses gas to apply pressure to raw materials and sinter them at high temperatures. At that time, the temperature was 1400 to 1600℃ and the pressure was 20 to 9 with argon gas containing water chart gas of DO1~01.
Sintering is carried out for 200 to 500 hours at 2 to 40 kg of seagull/2 of seagulls. Translucent jadeite crystals were obtained by kneading, and were confirmed to be mostly jadeite by X-ray diffraction.

Example 2 Seven tablespoons of the same raw materials as in Example 1 were added to HTP.

Next, the pressure was increased to 20 Kf6/m" with pure argon gas.
~40Kg/2 cranes, 50 at 1750℃~1850℃
Sinter for ~100 hours. As a result, translucent jadeite was obtained. Example 5 The procedure was the same as in Example 12, except that the sintering time was 1 to 5 hours, and the HTP treatment was performed. Next, apply this to a doble in a vacuum. Pressure is 10-20 Kn 2, time is 1
0-100 o'clock lI41. As a result, translucent jadeite was obtained.

(Effect of the invention) According to the present invention, formation of quaidite is obtained, and this is because the reaction proceeds in the direction of forming jadeite by applying pressure, and by carrying out the reaction at a high temperature, the reaction proceeds further. . Therefore, the present invention can obtain crystals of only jadeite, which have not been obtained conventionally.

that's all Applicant: Suwa Seikokin Co., Ltd.

Claims (1)

[Claims] Raw material lotus) IIium component (1 mol of N(7,), 1 mol of aluminum component cd), 2 mol of silicon (SZ), 6 mol of oxygen component (0), and 0.0 mol of iron component (Fe).
1. A method for producing a diadite crystal comprising 01 to 0.1 mole of diadite crystal, characterized by sintering it at high temperature and pressure, in a gas atmosphere or in vacuum.