煅烧温度对高岭土性质的影响

对湖北某地红岩崖的块状沉积型高岭土矿石进行化学成分分析、物相分析以及热重分析,原矿中高岭石含量达90%以上.探索了煅烧温度对产品白度、pH值的影响,结果显示最佳的煅烧温度区间为875～950℃,煅烧后产品白度≥80%,100g/L的高岭土产品悬浊液pH≤7,产品高岭土组分为偏高岭石.根据实验结果设定950℃的煅烧温度在某有限公司生产线进行了连续7天稳定生产的工业试验,得到白度为（82±1）、pH值为（6.20±0.2）,质量稳定且符合国家工业标准的产品.

Influence of calcination temperature on nature of kaolinite

Chemical composition analysis,phase analysis,and thermal gravimetric analysis were used to determine the basic nature of the massive sedimentary kaolinite in red rock cliff in Hubei province;the content of kaolinite in the crude ore is over 90%.The influence of calcination temperature on the whiteness,pH value of the product was explored.The results show that the optimum range of calcination temperatures is between 875 ℃ and 950 ℃,the whiteness of the product is greater than or equal to 80%,the pH of 100 g/L suspension of the product is less than 7.The calcination temperature was set at 950 ℃ based on the experimental results,continuous industrial test of stable production for 7 days was made in a special flour limited production line and the product was gained with whiteness（82 ± 1）,pH（6.20 ± 0.2）.The quality of product is stable,which meets the national industrial standard.