Experimental Study on Optimization of Coal Electrochemical Desulfurization Process under Acidic Conditions

Abstract

The feasibility of using added catalysts and organic solvents to improve the efficiency of coal electrolytic desulfurization was explored based on the study of the optimal electrolytic desulfurization conditions under acidic coal conditions using Shanxi Shigejie coal samples as raw materials.The effects of inorganic catalyst and organic solvent on inorganic and organic sulfur in coal were investigated under the condition of Hcl as the electrolyte, and the changes of sulfur content in coal before and after the experiment were analyzed by Coulometric titration, AAS, GB/T 215-2003, and total sulfur differential subtraction method, and the changes of surface functional groups of organic sulfur model compounds before and after desulfurization were analyzed using infrared spectroscopy to study the mechanism of electrolytic desulfurization of sulfur in coal.Nacl, Mgcl2, Fe(NO3)3, MnSO4 and Fe2(SO4)3 were selected as inorganic catalysts, and DMF, CH3OH and DMSO were used as organic solvents to compare the desulfurization rates of inorganic and organic sulfur in coal samples before and after immersion and before and after electrolysis, respectively.The experimental results show that under the best electrolytic desulfurization conditions, manganese sulfate can significantly improve the inorganic sulfur removal efficiency, DMF+CH3OH, DMF organic solvent for immersion desulfurization is not obvious, but the organic sulfur removal efficiency is significant after electrolytic desulfurization.