Research on the Method of Measuring Free Carbon Content in Chloride Molten Salt Using Oxygen Rich Combustion Infrared Absorption Method
Free carbon is one of the important reactants in molten salt chlorination,which has a significant impact on the rate of titanium dioxide chlorination reaction.Accurately measuring the content of free carbon in molten salt is of great guiding significance for controlling chlorination reaction and furnace charge addition.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 experiment proposed diluting petroleum coke standard samples with sodium chloride to prepare calibration samples of different concentrations of free carbon.At the same time,the instrument reagent tube was modified to absorb chlorine gas with quartz sand calcium hydroxide(3∶1,mass ratio),effectively solving the above problems.The experiment also discussed the effects of combustion temperature,oxygen pressure,and sample size on the determination of free carbon.The experimental results indicate that the optimal measurement conditions for free carbon in chloride molten salt are when the sample size is 0.15 g,the combustion temperature is 700℃,and the oxygen pressure is 0.50 MPa.Experimental methods were used to measure the chloride molten salt samples and calibration samples prepared during the production process.The precision of the method was less than 2.0%,and the measured values of the calibration samples were within the allowable error range of the experiment.
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