Synthesis method of potassium hexatitanate whisker

Abstract

The invention discloses a preparation method of potassium hexatitanate crystal whiskers, which adopts a technique of melting and quenching for synthesis and has convenient and feasible process flow. First, raw materials containing titanium and gallium are mixed with fluxing agent, sintered in an elevated temperature vessel, taken out after being melted, and quenched on special quenching equipment, thereby producing well-proportioned fine powder with particle diameter less than 1mm. Then, the powder is put into a reactor with hot water; the quantity of potassium ion release is controlled by controlling the acidity of the solution. While the reaction is finished, the product is filtered, washed by deionized water at the temperature of 20 to 40 DEG C repeatedly, soaked by surface active agent, and sintered directly after being filtered, thereby obtaining the end product. There is no pollution throughout the process. The synthetic potassium hexatitanate crystal whiskers synthesized by themethod have the advantages of few un-needle-shaped particles, low cost, low thermal conductivity, high infrared reflectivity and good sound-absorbing property at high temperature, with the average length of the crystal whiskers being 5 to 30um and the average diameter being 0.5-3um, can be used as reinforcing material, friction material, thermal insulation material and the like, and have a yield higher than 97%.

Description

technical field [0001] The invention belongs to a method for manufacturing inorganic salt whiskers, in particular to a method for manufacturing potassium hexatitanate whiskers. Background technique [0002] In the prior art, Chinese patent application No. 200610029750.7 discloses a method for producing potassium hexatitanate whiskers. 2 :K 2 O = 1.9-2.0 molar ratio ratio weighing, after mixing evenly, enter the high-temperature furnace at 900-1300 ℃, and quench into a fine powder with a particle size of less than 1mm by a special quenching machine; according to the solid-liquid ratio of 1:15 to 1 : The ratio of 5 is put into the hot water reactor at 90-99°C; solid-liquid separation, the solid part is washed repeatedly with deionized water at 1-4°C, and the sulfate ions (SO 4 2- ), dry, and remove surface water; stay at 600-1000°C for 90-360 minutes to complete the recrystallization transformation, and it will be the finished product after cooling to room temperature. [...

AI Technical Summary

Problems solved by technology

[0004] 1. Repeated washing with deionized water at 1-4°C, the conditions are a bit harsh, especially difficult to achieve in summer

In addition, the lower the temperature, the lower the filtration rate of the alkaline solution, resulting in a reduction in production efficiency

[0005] 2. There will be agglomeration during the recrystallization sintering process, which requires a special crushing process, and then sieving and grading. Such mechanical crushing will inevitably lead to the breakage of some whiskers, which affects the uniformity of potassium titanate whiskers

[0006] 3. The process of drying and removing surface water is a relatively complicated process. The heating rate should not be too fast, otherwise hard blocks will appear. The heating rate is too low, which will affect the output of the product. In addition, this process is a waste of energy. larger process