RESEARCH ON DETERMINATION OF FIXED CARBON IN CARBONATE GRAPHITE ORE BY USING HIGH-FREQUENCY INFRARED METHOD

Method for determining fix carbon in carbonate type graphite ore is established by using high frequency IR-absorption spectrometry and the way of calibration curve is proposed.The sample weight,fluxing agent and the selection of acid and concentration are studied in detail.Precision and accuracy are in agreement with determined fixed carbon content of graphite ore.The method is validated by National Standard Reference materials with relative standard deviation of0.7%~3.37%(RSD,n=10),and with relative error of-1.03%~0.00%(RE%,n=10).Comparing with different testing methods,this method is simple,rapid,with good stability and high accuracy,greatly improved the detection efficiency of fixed carbon in graphite mine,especially suitable for measuring the content of carbon in graphite ore containing carbonate.