A method for large-scale production of potassium titanate by utilizing ore-grade titanium-containing compounds

Abstract

The invention discloses a method for producing potassium titanate in a large scale by utilizing an ore-grade titanium-containing compound, belonging to the technical field of preparation of inorganic materials. The method is mainly characterized in that: the ore-grade titanium-containing compound and potassium-containing compound are directly taken as raw materials, the raw materials are mixed to be uniform, the mixture is subjected to high temperature calcining (microwave calcining preferably) for 30 minutes to 24 hours at the high temperature of 900-1300 DEG C, whisker potassium titanate or flaky potassium titanate can be prepared by one-step synthesis, and the potassium titanate obtained by calcination is smashed, thus the finished product is obtained. A cheap ore-grade titanium-containing compound is taken as a reaction raw material, no fluxing agent is used in a preparation process, and no magnesium-containing raw material is used in preparation of the flaky potassium titanate, thus the raw material cost is greatly reduced, the procedure is simplified, and the corrosion loss of equipment in a high temperature alkali environment is reduced, thus being more applicable to mass production; and meanwhile, calcinations under the catalysis of microwave is utilized to speed up synthetic reaction of the potassium titanate, and the production efficiency is improved.

Description

Technical field [0001] The invention belongs to the technical field of inorganic material preparation, and specifically relates to a method for large-scale production of potassium titanate by using ore grade titanium-containing compounds. Background technique [0002] Potassium titanate, including potassium hexatitanate (K 2 Ti 6 O 13 ) And potassium octatitanate (K 2 Ti 8 O 17 ), has excellent mechanical properties, and its special tunnel structure gives it many unique physical and chemical properties, such as: high infrared reflectivity, low thermal conductivity, high heat resistance, high wear resistance, high electrical insulation and medium The electrical constant, high chemical stability, etc., therefore have an attractive and broad application prospect, especially in the automotive industry, and its application is receiving increasing attention. As a new generation of friction material, the use of potassium titanate in brake pads can not only greatly improve braking perfor...

AI Technical Summary

Problems solved by technology

Excessive raw material costs, high-temperature alkaline corrosion, complicated procedures, and difficulty in achieving large-scale production are the main reasons for the high production cost of potassium titanate whiskers

[0004] At present, people cannot directly prepare flaky potassium titanate in one step, and its synthesis generally requires the addition of magnesium-containing raw materials, so what is actually obtained is flaky potassium magnesium titanate, not potassium titanate.

The preparation method of flaky potassium magnesium titanate often needs to add auxiliary solvents such as potassium chloride, potassium fluoride, potassium molybdate, potassium tungstate, for example: patent CN 1444544A uses potassium chloride as auxiliary solvent, and patent CN 101254945A uses potassium chloride as auxiliary solvent. 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

[0005] At present, in the actual production of potassium titanate whiskers and flaky potassium magnesium titanate, there are strict restrictions on the stacking height of the reaction raw materials, generally below 10cm, and the highest is no more than 20cm, so it is not true. Large-scale production, so the development of large-scale production methods for potassium titanate series products is also of great urgency

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