Research on the Method of Measuring Carbon Content in Chlorinated Molten Salt by Resistance Furnace Heating Coulomb Electrolysis
Carbon is one of the important reactants in molten salt chlorination,and its content directly affects the chlorination efficiency of titanium dioxide in titanium ore,while playing an important role in maintaining the thermal balance of the chlorination furnace.Chlorinated molten salt belongs to high chlorine samples.Currently,when using tube furnaces or high-frequency furnaces for combustion,there are problems with the lack of corresponding standard samples to establish instrument standard cost curves and the corrosion of instruments caused by chlorine gas generated by combustion when determining the carbon content in molten salt using infrared absorption method.The method of measuring carbon content in chloride molten salt samples using resistance furnace heating Coulomb electrolysis was experimentally studied.By modifying the instrument purification system,a 0.2 mol/L ferrous chloride solution was used to absorb the chlorine gas generated by combustion,effectively solving the interference of chlorine on carbon determination;Secondly,dilute the petroleum coke standard sample with sodium chloride and prepare carbon quality control samples of different concentrations to effectively monitor the experimental process and instrument status,ensuring accurate measurement results.The experimental results show that when the sample size is 400～450 mg and the heating temperature is 1 150 ℃,the carbon in the chloride molten salt is completely oxidized to carbon dioxide.The experimental method was used to measure the samples and quality control samples,and the precision of the method was less than 1.0％.The measurement results of the quality control samples were consistent with the theoretical values.
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