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采用偏钛酸(H2TiO3)和碳酸钾(K2CO3)为原料,研究不同碳酸钾和偏钛酸中TiO2的摩尔比(n(K2CO3)/n(TiO2))、不同焙烧温度和焙烧时间对产物钛酸钾晶型与形貌的影响,并利用XRD和SEM对其相组成及形貌进行分析。结果表明,以偏钛酸为原料六钛酸钾的最佳合成工艺条件为:n(K2CO3)/n(TiO2)为1/3.5,经过(900℃,1h)+(1000℃,2h)+(1100℃,2h)+(1150℃,2h)高温下焙烧,即可得到平均直径为0.62μm、平均长度为11.06μm的六钛酸钾晶须。产物中六钛酸钾晶须的含量高达97.1%。合成的六钛酸钾晶须亮度为87.26,具有良好的白色颜料性能。
The molar ratio of n (K2CO3) / n (TiO2) to TiO2 in different potassium carbonate and metatitanic acid was studied by using H2TiO3 and K2CO3 as raw materials. The effects of calcination temperature and calcination time on the yield of titanium Potassium form and morphology, and the phase composition and morphology were analyzed by XRD and SEM. The results show that the optimal synthesis conditions of potassium hexatitanate using metatitanic acid as raw material are as follows: the molar ratio of n (K2CO3) / n (TiO2) is 1 / 3.5 and the temperature is 900 ℃ for 1h + 1000 ℃ for 2h + (1100 ℃, 2h) + (1150 ℃, 2h) at high temperature to obtain potassium hexatitanate whiskers with an average diameter of 0.62μm and an average length of 11.06μm. Product potassium hexatitanate whisker content of up to 97.1%. The synthesized potassium hexatitanate whisker brightness 87.26, with good white pigment properties.