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Potassium titanate whisker and its synthesis

A technology of potassium hexatitanate whiskers and potassium tetratitanate, applied in the fields of titanium compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as container corrosion, and achieve reduced manufacturing costs, low thermal conductivity, and reasonable layout Effect

Inactive Publication Date: 2006-08-23
上海秀普复合材料有限公司
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Problems solved by technology

The disadvantage is that the flux method has the corrosion problem of the container

Method used

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Embodiment Construction

[0006] Titanium dioxide TiO 2 : Potassium oxide K 2 O molar ratio is 3.5: 1, the addition of boron compound is 5% of titanium dioxide weight, after above-mentioned raw material is mixed, put into alkali-resistant container, be heated up to 800 ℃, be heated up to 1200 ℃ with 1 ℃ / min, stay 4 Slowly lower the temperature to 800° C. and take it out to obtain whisker bundles of potassium tetratitanate; disperse the whisker bundles of potassium tetratitanate in cold water to obtain whiskers of potassium tetratitanate. Potassium tetratitanate whiskers were mechanically stirred in hot water at 100°C for 4 hours. The water in this process was reused for washing soluble potassium compounds in the subsequent process; neutralized the leached potassium ions with 15% dilute sulfuric acid, Potassium hexatitanate whisker amorphous hydrate is obtained, and the hydrate stays at a temperature of 1200°C for 6 hours to complete the crystallization transformation, and then washes all soluble potas...

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Abstract

The present invention is one new synthesis process of potassium titanate whisker. TiO2 and K2O in the molar ratio of 2.5-3.5 and boron compound in the amount of 1-5 wt% of TiO2 are mixed and the mixture is heated inside one alkali-resisting container first to 800 deg.c and then to 900-1200 deg.c at the raising rate of 1 deg.c / min, maintained for 1-4 hr and cooled slowly to 800 deg.c to obtain potassium tetratitanate whisker bundle. The potassium tetratitanate whisker bundle is stirred mechanically in hot water at 80-100 deg.c for 1-4 hr and neutralized in 5-15 % concentration dilute sulfuric acid solution to obtain amorphous hydrate of potassium hexatitanate whisker. Through further staying at 800-1200 deg.c for 2-6 hr to complete crystal conversion, washing in hot water (80-100 deg.C) to eliminate soluble potassium compound and drying at 200 deg.c over, potassium hexatitanate whisker product with average length of 10-50 micron and average diameter less than 0.5 micron is produced.

Description

technical field [0001] The invention belongs to a synthesis method of inorganic salt whiskers, in particular to potassium titanate whiskers and a synthesis method thereof. Background technique [0002] The composition of potassium tetratitanate whiskers is K 2 Ti 4 o 9 , the structure is a layered structure, K + Ions are in the interlayer. A direct consequence of this structure is that K + Ions are unstable, therefore, the main use of potassium tetratitanate whiskers is concentrated on K + ion instability. That is, the K in potassium tetratitanate whiskers + Ions are ion-exchangeable. According to this characteristic, it can be used in the treatment of nuclear waste, realizing the non-radiation treatment of nuclear waste. In addition, it is also used in PTC, fuel cells, etc. Potassium tetratitanate is also an intermediate in the synthesis of potassium hexatitanate and potassium octatitanate. It is relatively difficult to directly synthesize potassium hexatitanate,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00
Inventor 黄继芬张毅赵力力
Owner 上海秀普复合材料有限公司
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