兰炭末制备水炭浆的影响因素及工艺研究

STUDY ON PREPARATION OF PROCESS AND INFLUENCING FACTORS OF COKE WATER SLURRY FROM BLUE-COKE POWDER

利用陕北地区的兰炭末制备水炭浆,研究了兰炭末的粒度配比、制浆搅拌作用及温度对水炭浆表观黏度、流动性和稳定性的影响。兰炭末用实验室球磨机研磨好并筛合成〉830目（D1）,200目～320目（D2）,100目～200目（D3）和60目～100目（D4）四种粒径范围。结果表明,当兰炭末的粒度配比m（D1）∶m（D2）∶m（D3）∶m（D4）为5∶2∶2∶1,搅拌速率为1 500r/min,搅拌时间为15min,环境温度为30℃～40℃时,制备出的水炭浆质量分数可达到60%,表观黏度360mPa·s,浆体可以保持一个月内稳定并且流动性良好。随着细粒度兰炭颗粒加入量的增加,水炭浆表观黏度增大,流动性变差,稳定性增强。搅拌速率过高和搅拌时间过长会导致浆体老化,流动性变差。当温度逐渐升高时,水炭浆的表观黏度呈现出先降低后增加的趋势。

This paper investigated the effect of particle size distribution, slurry stirring and ambient temperature on the properties of coke water slurry, which was prepared by blue-coke fines in Northern Shaanxi. The blue-coke samples were ground with a laboratory size ball mill, and the particles were screened and separated into the following size range： 〉320 mesh（D1）, 320 mesh-200 mesh（De）, 200 mesh-120 mesh（D3）, 120 mesh-60 mesh（D4）. The results indica- ted that the optimum conditions for the preparation of coke water slurry were as following： the granularity ratio （D1 ： D2 ： D3 ： D4） is 5 ： 2 ： 2 ： 1; the stirring sPeed is 1 500 r/min; the stirring time is 15 min; the surrounding temperature at a range of 30 ℃ to 40 ℃. Under conditions above the slurry could keep its stability for one month long and show good fluidity, the mass fraction reached 60% and the apparent viscosity could reach 360 mPa · s. When adding fine-grained blue- coke particles, the apparent viscosity improved, fluidity reduced, and the stability reinforced. Excessive agitation had a contrary influence on the pulp, which would lead to poor fluidity and aging slurry. Along with the increase of temperature, apparent viscosity of coke water slurry de- creased firstly and then rose up, as a result, got the minimum value（360 mPa · s） in the range of 30 ℃ to 40 ℃.