Experimental study on preparing of CWS dispersants with humic acid from peat

Using orthogonal experimental design,adopts alkali extraction and sulfonation two step methods to produce humic acid CWS dispersants from peat,obtained better process parameters. In the alkali process extraction,the solid- liquid mass ratio is 1∶ 12,reaction temperature is 100℃,NaOH solution concentration is 2% and reaction time is 2 hours; In humic acid sulfonation process,the NaSO₃ dosage is 2. 4 g,sulfonation temperature is 40℃ and sulfonation time is 80 min. under above process conditions,19. 074 5 g humic acid CWS dispersant can be produced from 50 g peat. Using this kind of dispersant preparing CWS from Shenmu coal,when the CWS mass concentration is 60%,The dosage is 1%,and the CWS apparent viscosity is 602. 1 mPa·s。