A new method of coal fine particles humidification and agglomeration: Synergistic dust suppression with composition of soap solution

Abstract

Coking plants usually use surfactants to increase the surface wettability of fine coking coal particles, promote its agglomeration, and achieve the purpose of reducing dust emission. The Soap solution as a chemical agent contains not only soap base active ingredients, but also abundant surfactants and antifouling redeposition agents. The aim of this study is to optimize the dust suppression effect by blending the chemical composition proportion of existing soap solution, and analyze the interaction mechanism of each component on the surface of fine particles, then realize the dust suppression with low cost and high dust suppressor effect. Keeping the other ingredients remain the same, the hydrophilic organosilicone and carboxymethyl starch were selected as antifouling redeposition agents; the anionic surfactant sodium fatty acid methyl ester sulfonate (MES), non-ionic surfactant fatty acid methyl ester ethoxide (FMEE) and fatty alcohol polyoxyethylene ether (AEO-9) were used to mix in different proportions. The wetting effect and adsorption rate of the compound soap solution on the surface coal were tested. Then the particle coating efficiency, size growth rate and dust removal amount during the spraying of compound soap solution were tested and mechanism analysis in the device developed by the laboratory. The result indicates the wettability and agglomeration efficiency of coal particles can be obviously improved by increasing the proportion of FMEE and AEO-9. Compared with carboxymethyl starch, using hydrophilic organosilicon as antifouling redeposition agent can increase the adsorption capacity of raw coal to surfactants by 5% and the particle growth rate by 2%.