黑岱沟选煤厂高浓度煤泥浆制备

Preparation of high concentration coal slurry in Heidaigou Coal Preparation Plant

以黑岱沟选煤厂煤泥为研究对象,采用单因素试验法探究了剪切强度、剪切时间、煤浆浓度、添加剂用量、添加剂种类及温度对高浓度煤泥浆流变特性及稳定性的影响规律,得到了满足中远距离管道输送要求的高浓度煤泥浆制备条件。结果表明,符合中远距离管道输送要求的高浓度煤泥浆最佳制备条件为:剪切时长15 min、剪切强度2500 r/min、添加剂用量0.5%、浆体浓度64%~65%。在最佳条件下制备的浆体表观黏度为492 mPa·s,沉降15 d后,仍能保持较好的流动性;添加剂种类对于煤浆流变特性改善效果影响显著,对于黑岱沟煤泥,准能矸电公司提供的水煤浆添加剂可达到最优降黏效果,相较木质素磺酸盐类及萘系添加剂,降黏效果分别超过700、200 mPa·s;选用准能矸电公司水煤浆添加剂及最佳制备条件下,高浓度煤泥浆的流变特性及稳定性完全满足中远距离管道输送要求。

Taking the slime of Heidaigou Coal Preparation Plant as the research object,the single factor test method was used to explore the effects of shear strength,shear time,coal slurry concentration,additive dosage,additive type and temperature on the rheological properties and stability of high concentration coal slurry.The preparation conditions of high concentration coal slurry which can meet the requirements of medium and long distance pipeline transportation were obtained.The results show that the best preparation conditions of high concentration coal slurry which meet the requirements of medium and long distance pipeline transportation are as follows:shear time 15 min,shear strength 2500 r/min,additive dosage 0.5%,slurry weight concentration 64%-65%.The apparent viscosity of the slurry prepared under the optimum conditions is 492 mPa·s,which can still maintain good fluidity after settling for 15 days.The kinds of additives have obvious influence on the improvement of the rheological properties of coal slurry,and the coal water slurry additives provided by Heidaigou coal slime and quasi-energy gangue power company can achieve the best viscosity reduction effect,which is higher than 700 and 200 mPa·s respectively compared with lignin sulfonates and nano-series additives.The rheological properties and stability of high concentration coal slurry under the best preparation conditions and the selection of coal water slurry additive of Quasi-energy Gangue Power Company can fully meet the requirements of medium and long distance pipeline transportation.