The Experiment Research On Preparation Of Dispersant Of Coal-water Mixture By Refined Cotton Wastewater

CWM(Coal-Water mixture) is a new clean coal-fuel. As an alternative fuel, it has been attended by the world. For the industrial production of CWM, the dispersant is the key factor of quality. Preparation of CWM by refined cotton wastewater is one of the methods of resource utilization of refined cotton wastewater.This experiment preliminarily studies the dispersant structure and performance of CWM which be made of refined cotton wastewater, and determines the optimum process parameters of extraction and sulfonation: the optimal reaction temperature range of extraction of lignin by acid is from 60℃to 80℃, and the optimal reaction pH is about 3.3; the optimal reaction temperature range of sulfonation of lignin is from 80℃to 90℃, and the optimal reaction time is about 180 minutes, and the best dosage of Na2SO3 is 0.8g/g(lignin), and the best dosage of HCHO is 0.6mL/g(lignin).By experiment research on performance of self-made dispersant for CWM in laboratory, it determines the best dosage of sulfonated lignin is 1.2%. In this condition, CWS can get to the highest concentration of 67.86% and the lowest viscosity of 820 mPa?s. and liquidity and stability to achieve the industry requirements. The experiment also had researched the preparation of CWM which be made of refined cotton wastewater which be diluted, and determined the prioritization scheme that wastewater will be diluted 1or 2 times. This can guarantee more than pulp concentration of 62%, and less than viscosity 1000mPa?s, and stability meet the requirement. that the CWM must be prepared before entering boiler.Meanwhile, this experiment will compare the performance of 1#CWM (made by the self-made dispersant) with the Performance of 2#CWM (made by diluted refined cotton wastewater) and 3#CWM (made by the dispersant which be sold on current market) respectively. The experiment found that the performance of sulfonated lignin which be made in laboratory is as the same as the one which be sold on current market. By diluting refined cotton wastewater to make the CWM directly, there is a gap with the performance of Sulfonated lignin,and it is limited that the CWM must be prepared before entering boiler.For the characteristics of refined cotton waste, this paper carried out experimental study on the comprehensive utilization of refined cotton wastewater by the numbers. These work provide references to solve the problem of controlling industrial pollution of refined cotton industry, and also to offer the basic parameters for the comprehensive utilization of lignin.