Preparation and influence factors of coal pitch water slurry

 The medium temperature coal tar pitch was used as the raw material to prepare coal tar pitch powder with certain particle size distribution by freezing and then pulverizing. By adding proper amount of dispersant and water, the coal tar pitch powder was made into the coal pitch water slurry (CPWS) at high agitating speed. The screening experiments show that the JL-C01 emulsifier has the best dispersion effect. The effect of the dispersant dosage and slurry concentration on the slurry-ability, rheological behavior and static stability of CPWS were investigated. The maximum slurry-ability concentration is 70%. The apparent viscosity of CPWS firstly decreases and then increases with increasing shearing rate when the dispersant dosage is same. For different slurry concentrations, the apparent viscosity of CPWS presents a decreasing tendency with increasing shearing rate. Under the same shearing rate, the apparent viscosity goes up as the slurry concentration increases. The CPWS is a pseudo-plastic fluid. The best rheological behavior is obtained when the slurry concentration is 69%. When the slurry concentration is 70%, the slurry maintains stable for 21d. Referring to coal water slurry criterion GB/T18856-2002, the combustion analysis of CPWS was made. The low heat value, ash, and the volatile matter all meet the first grade standard for coal water slurry. In addition, the sulfur content achieves the second grade standard.