Preparation method of non-fibrous potassium octatitanate

Abstract

The preparation method sequentially comprises the following steps: S1, mixing a titanium-containing raw material and a potassium-containing raw material according to the ratio of Ti / K2 = 1.5-3, grinding and crushing after mixing, then putting into a high-temperature furnace for calcining, setting the firing temperature to be 800-1000 DEG C, the heating rate to be 5-10 DEG C / min, calcining for 4-8 hours, and then cooling to room temperature according to the rate to be 2-5 DEG C / min; s2, crushing the product obtained in the step S2, sequentially adding a titanium-containing raw material and a phosphorus-containing auxiliary agent according to 1.5-2.5 times and 1-5% of the mass of the crushed material, and mixing; s3, putting the mixed materials into a high-temperature furnace to be calcined, setting the firing temperature to be 900-1200 DEG C, the heating rate to be 5-10 DEG C / min and the firing time to be 4-8 hours, and then cooling to room temperature according to the rate of 2-5 DEG C / min; and S4, crushing and grading the cooled material to obtain a product. The preparation method disclosed by the invention is simple in synthesis process and is obtained by a two-step sintering method.

Description

technical field [0001] The invention relates to potassium titanate, in particular to a preparation method of non-fibrous potassium octatitanate. Background technique [0002] Potassium titanate refers to the chemical formula K 2 O nTiO 2 (n=2, 4, 6, 8), it is a crystalline substance tested by a target X-ray powder diffractometer. Wherein, n=2 is called potassium dititanate, n=4 is called potassium tetratitanate, n=6 is called potassium hexatitanate, and n=8 is called potassium octatitanate. Different n, potassium titanate has different crystal structures, so its physical and chemical properties are significantly different, among which potassium octatitanate (K 2 TiO 17 ) crystal structure is based on TiO 6 The octahedron is a chain tunnel-like structure connected by common planes and common edges. K + Occupy the middle of the tunnel. This unique crystal structure endows potassium octatitanate with excellent physical and mechanical properties and good photocatalytic a...

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Problems solved by technology

Moreover, since potassium titanate whiskers are fibrous and have poor fluidity, they tend to deposit on the walls of the feed channels and block the channels when manufacturing friction materials, which has become a problem in this field.

At the same time, because whisker materials are easy to inhale the respiratory tract and endanger human health, many countries have proposed restrictions on the use of whisker materials.

Potassium octatitanate disclosed in existing patents is fibrous and has complicated production process and high production cost

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