Determination of chlorine in iron ore by combustion furnace-ion chromatography
LI Ting1, REN Li-ping2, MIN Hong*2, LIU Shu2, ZHANG Lin-lin2, LIN Miao1
1. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China; 2. Shanghai Entry-Exit Inspection and Quarantine Bureau, Shanghai 200135, China
Abstract：The chlorine in iron ore is harmful to the steal smelting equipment and atmospheric environment, and it is an important index to evaluate the quality of iron ore. At present, the determination methods of chlorine in iron ore usually have some disadvantages. For example, the sample treatment process is complicated; the pretreatment and determination are not simultaneous. Aiming at these problems, the combined combustion furnace-ion chromatography method was adopted. In other words, the samples were decomposed and combusted in combustion furnace and the generated gases were absorbed followed by analysis by ion chromatography. This process realized the automation analysis of solid injection, combustion, absorption and determination. In order to improve the combustion efficiency of iron ore sample, the conditional experiments of sampling amount, combustion temperature, combustion time and flux were conducted. The results showed that the sample could be fully combusted without use of flux under the following conditions: the sampling amount was 50mg, the combustion temperature was 1050℃, and the combustion time was 500s. The linearity of calibration curve was good when the mass concentration of chlorine was in range of 0-25μg/mL. The linear correlation coefficient was R=0.9993, and the detection limit of method was 0.0007%. Five standard samples of iron ore were determined, and the relative standard deviations (RSD, n=6) were between 2.4% and 5.0%. The determination results were compared with those obtained by the current national standard method (GB/T 6730.69-2010 Determination of chlorine in iron ore by steam distillation-ion chromatography). F test and t test were conducted for verification. It was found that there was no significant difference between two methods. However, the degree of automation was higher for combustion furnace-ion chromatography. The determination of chlorine in iron ore could be finished within 20min.
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