Guizhou Disk Northern Coal Slurry System Cws Grading Technology Research And The Analysis Of Thermal Characteristics

At present, there is plenty of sludge insufficiently used in our country's mining areas, which both wastes resources and contaminates environment, at the same time, affects the normally producing of coal washery. The technology of burning CWM, made of sludge, can not only solve these problems but simplify the processing flow of sludge water in coal washery, save construction expenditure of coal washery and lower the cost of coal dressing.This paper chose the sludge of Panbei coal washery in Guizhou to do the experiments of pulping, and studied the graded technology, which id one of the factors affecting the property of pulping during mentioned above process, including separate experiments of pulping using coarse and fine particle, double-humped graded experiments, multiple-perked graded experiments and theoretical graded experiments, in order to find an optimum gradation of particle size, thus its made-up CWM can meet the demand on density, viscosity and stability. Through multiple experiments, we have got the optimum mixture ratio of particle size of sludge (-320,320-200,200-100,100-60 sieve number): 60:10:20:10, under this condition, viscosity number is 1026 mPa·s, time of stability is 6 days and the highest pulping density is 62%.In the aspect of understanding the combustion characteristics of CWM, this paper analysed the thermal performance of CWM made by optimum gradation and primary sludge using the technology of TG-DTG-DTA thermal analysis, and compared their differences of combustion characteristics of CWM under different density, then will give a certain estimation of its combustion characteristics for commercial run.