Method for preparing magnesium potassium titanate by directly utilizing magnesium oxide

A technology of potassium magnesium titanate and magnesium oxide, which is applied in the fields of chemical instruments and methods, inorganic chemistry, titanium compounds, etc., can solve the problems of restricting the large-scale popularization and application of potassium magnesium titanate, increasing the production cost of potassium magnesium titanate, and unfavorable scale Production and other problems, to achieve the effect of reducing equipment corrosion loss, reducing calcination time, and strong activity

Active Publication Date: 2011-11-02
北京无界实验科技有限公司
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Problems solved by technology

Ceramic brake pads containing potassium magnesium titanate have been widely used abroad, and are currently in a promotion stage in China. However, the high production cost has long restricted the large-scale promotion and application of potassium magnesium titanate in the Chinese domestic market.
[0003] The existing preparation method of potassium magnesium titanate often needs to add auxiliary solvents such as potassium chloride, potassium fluoride, potassium molybdate, potassium tungstate, etc., for example: patent CN 1444544A uses potassium chloride as auxiliary solvent, patent CN 101254945A Carnallite (KMgCl 3 ·6H 2 O) as cosolvent and magnesium source, although the use of cosolvent can reduce temperature of reaction, improve product quality, also brought following serious shortcoming to the production preparation of potassium magnesium titanate simultaneously: (1) cosolvent brings Alkaline environment leads to rapid equipment corrosion loss at high temperature; (2) The loss of co-solvent increases the production cost of potassium magnesium titanate; (3) The extensive use of co-solvent causes the mixed raw materials to soften severely at high temperature, even appearing in a liquid state, This is not conducive to large-scale production; (4) the use of cosolvent makes subsequent pickling and water washing indispensable, causing the production process to become complicated, for example: the CN 1444544A patent of Otsuka Chemical Co., Ltd. is to mix 294 grams of titanium dioxide, 128 grams Anhydrous potassium carbonate, 200 grams of KC1, 56 grams of magnesium hydroxide, 40 milliliters of water are fully mixed and uniform → pressed into a certain shape → calcined at 1050 ° C for 1 hour → crushed → pickling and washed at a certain pH value → drying → about 600 ° C Heat treatment for 12h
But the method for preparing potassium magnesium titanate directly with magnesium oxide as magnesium raw material has not yet been reported at present

Method used

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  • Method for preparing magnesium potassium titanate by directly utilizing magnesium oxide
  • Method for preparing magnesium potassium titanate by directly utilizing magnesium oxide
  • Method for preparing magnesium potassium titanate by directly utilizing magnesium oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Potassium carbonate, light-burned magnesia and titanium dioxide are respectively expressed in K 2 O, MgO, TiO 2 In terms of molar ratio K 2 O:MgO:TiO 2 =1.3:1:4, fully mix the above three raw materials, add an appropriate amount of water during the mixing process, and the amount of water added is based on the convenience of subsequent molding; then use the mold to pressurize the above mixture into a 5cm high , Cylindrical shape with a diameter of 6cm, the diameter of the channel is 6mm, and the distance between the holes is 1cm; the above-mentioned cylindrical blank is heated to 1100°C in a microwave shuttle kiln, kept for 2 hours, then cooled to 800°C with the furnace, and then air-cooled to room temperature ; Grind the calcined product to 150 mesh with a Raymond mill, and the product obtained is potassium magnesium titanate in the form of white powder. The X-ray diffraction analysis shows that the chemical formula of the product obtained is K 2 MgTi 4 o 10 , nam...

Embodiment 2

[0060] Potassium carbonate, modified activated magnesia and titanium dioxide were denoted by K 2 O, MgO, TiO 2 In terms of molar ratio K 2 O:MgO:TiO 2 =1.9:1:4, fully mix the above three raw materials, add an appropriate amount of water during the mixing process, the amount of water added is based on the convenience of subsequent molding; then use the mold to press the above mixture into a 6cm× 5cm×5cm cuboid, the diameter of the channel is 6mm, and the hole-to-hole spacing is 1cm; the above-mentioned cuboid blank is heated to 1150°C in a gas-fired shuttle kiln assisted by microwave heating, kept for 2 hours, and then cooled to 800°C with the furnace, Cool in air to room temperature; grind the calcined product to 100 mesh with a Raymond mill, then wash with water, stir, filter, and finally heat-treat at 600°C for 5 hours, and the product obtained is potassium magnesium titanate in the form of white powder. The X-ray diffraction analysis shows that the chemical formula of th...

Embodiment 3

[0062] Potassium carbonate, underburned magnesia and titanium dioxide are respectively expressed in K 2 O, MgO, TiO 2 In terms of molar ratio K 2 O:MgO:TiO 2 = 1.6:1:4, fully mix the above three raw materials, add an appropriate amount of water during the mixing process, the amount of water added is based on the convenience of subsequent molding; then use the mold to pressurize the above mixture into a 6cm× 5cm×5cm cuboid, the diameter of the channel is 6mm, and the hole-to-hole spacing is 1cm; the above-mentioned cuboid blank is heated to 1150°C in an electric heating shuttle kiln, kept for 2 hours, then cooled to 800°C with the furnace, and then air-cooled to room temperature; The calcined product was pulverized to 100 mesh with a Raymond mill, then washed with water, stirred, filtered, and finally heat-treated at 600°C for 5 hours, and the obtained product was potassium magnesium titanate in the form of white powder. The X-ray diffraction analysis shows that the chemical...

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Abstract

The invention discloses a method for preparing magnesium potassium titanate by directly utilizing magnesium oxide, belonging to the technical field of inorganic material preparation. The method is mainly characterized in that: magnesium oxide, titaniferous compound and potassium titanate are directly taken as raw materials, the raw materials are mixed to be uniform, the mixture is calcined for 30 minutes to 24 hours at high temperature of 900-1300 DEG C, magnesium potassium carbonate (K2MgTi4O10, namely K2O. MgO. 4TiO2) can be prepared by one-step synthesis, and the obtained magnesium potassium carbonate after calcination is smashed, thus the finished product is obtained. Magnesium oxide is utilized as a reaction raw material, material cost is reduced, no fluxing agent is used in the preparation process, and no alkali magnesium raw material is used, thus rapid equipment corrosion loss in the high temperature alkali environment is reduced in the preparation process of the magnesium potassium titanate, the method is more applicable to mass production, and the process is simplified; meanwhile, calcination under microwave catalysis is utilized to speed up synthetic reaction of the magnesium potassium titanate, thus the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation, and in particular relates to a method for directly using magnesium oxide to prepare potassium magnesium titanate. Background technique [0002] Potassium magnesium titanate (K 2 MgTi 4 o 10 , namely: K 2 O·MgO·4TiO 2 ) has excellent mechanical properties, and its special layered structure endows it with many unique physical and chemical properties, so it has attractive broad application prospects, especially in the automotive industry, and its application is increasingly valued. Japanese patent publication 5-221795 once described the preparation method of layered potassium magnesium titanate, and Japanese patent publication 2000-230618 described using it as a friction control agent for friction materials. The prepared friction materials have stable properties from low temperature to high temperature. Friction and wear properties. As a new generation of friction materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B29/64C30B1/10C01G23/00
Inventor 申玉田徐艳姬申偲伯王玺龙
Owner 北京无界实验科技有限公司
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