水焦浆的制备及其流变特性

Preparation and Rheological Property of Char Water Slurry

为制备高浓度的水焦浆以代替水煤浆生产中的煤,采用成浆实验法对焦沫进行成浆实验,探讨添加剂、粒度级配对水焦浆成浆性能的影响。结果表明:以DCS-3为水焦浆添加剂,α组粒径(粒度级配中粒径≤75μm的颗粒占焦沫总质量比例)焦粉为75%时,可制备性能优良的水焦浆,其定粘浓度可达到70.63%。浆体呈假塑性流体,不仅具有良好的剪切变稀特性和流动性能,还具有良好的稳定性能,可保持7 d不产生软沉淀。粒度级配对焦沫的成浆性能有重要影响,随着α的增加,水焦浆的成浆浓度逐渐降低、稳定性能和假塑性特性逐渐增强。

The effect of additives and grinding process on slurry-ability of coal-char was investigated by conducting slurry performance experiment. Results showed that char water slurry of good property can be prepared by using Naphthalenelignin complex additive DCS- 3 and fine coal-char with particle size less than 75 μm accounting for 75 % of the total char's mass. Meanwhile,the slurry concentration can reach up to 70. 63 % and it can maintain the good stability for 7 days and still displays the good fluidity,pseudo-plastic and shear thinning behavior. Grinding process has great effect on the slurry-ability of coal-char. With increase of the fine coal-char with particle size less than 75 μm,the slurry concentration decreases,while the stability and pseudo-plastic behavior improve gradually.