印染废水制备水煤浆试验研究

Experimental Study on Preparation of Coal Water Slurry by Printing and Dyeing Wastewater

为了利用印染废水代替水煤浆制浆用水和分散剂,采用印染废水和煤样制备水煤浆,并与常规水煤浆成浆性能相比较,结果表明:当改性木质素分散剂质量分数为0.5%时,能够制备出质量分数为60%的常规水煤浆,水煤浆在剪切速率为100 s^(-1)时的表观黏度小于1 200 m Pa·s,且浆体流动性和稳定性好,为屈服假塑性流体;在不添加任何分散剂的情况下,印染废水能与煤样直接制得质量分数为60%的水煤浆,印染废水水煤浆在剪切速率为100 s^(-1)时的表观黏度小于1 200 m Pa·s,仍为屈服假塑性流体;对于采用印染废水制备的水煤浆,可以通过加入少量改性木质素分散剂提高水煤浆浓度;印染废水还能起到一定的固硫作用。

In order to make use of printing and dyeing wastewater instead of water and dispersant in coal water slurry preparation, coal water slurry was prepared by printing and dyeing wastewater and coal sample, and was compared with the conventional coal water slurry. The results showed that when the mass fraction of the modified lignin dispersant was 0.5%, conventional coal water slurry with mass fraction of 60% could be prepared. When the shear rate was 100 s-l,the apparent viscosity was less than 1 200 mPa＂ s, which was in good fluidity and stability and presented yield pseudoplastic fluid. Without any dispersants, coal water slurry with mass fraction of 60% could be prepared directly by printing and dyeing wastewater and coal sample, and when the shear rate was 100 s-~, the apparent viscosity was less than 1 200 mPa. s, which still presented yield pseudoplastic fluid. The concentration of coal water slurry prepared directly by printing and dyeing wastewater could be increased by adding a small amount of modified lignin dispersant. The experimental results showed that printing and dyeing wastewater could also play a role in sulfur fixation.