DETERMINATION OF CHLORINE IN FEATURES OF BLAST FURNACE

Production of ferrous metals, extraction and processing of raw  materials  are  environmentally  hazardous  industries.  In  addition to emissions of gases into the atmosphere and pollution of water bodies a lot of solid waste is formed. Chlorine plays a special role in blast furnace processes. The presence of chlorine compounds in the blast furnace gas leads to corrosion of pipelines, air heaters and tuyeres of  blast  furnaces.  Behavior  of  chlorine  in  blast furnace determines the properties of the agglomerate during the technological process of recovery. Monitoring the mineral chlorine in the sediments on the filters and dust collectors (in the form of chlorine associated with the metals) are important for estimating the toxicity of waste, as well as for evaluating the production process. In the practice of chlorine determination, a number of physical methods of analysis are used: AES,  ICP-MS, neutron activation analysis methods. But chemical methods:  titrimetric,  photometric,  electrochemical,  inframetrics  are  the  most widespread. The development of rapid and inexpensive methods for determining chlorine is relevant for the analysis of technological objects,  including  the  objects  of  metallurgical  production. The objects of research in this work were the samples of blast furnace slag enterprises for the production of cast iron of JSC «Tulachermet», as well as the dusty waste of the iron foundry of JSC «Kosogorsky metallurgical plant». A preliminary analysis of the composition of investigated samples was performed by X-ray fluorescent method. The interfering effect  of  the  accompanying  components  was  discussed. A  selective  method  for  ionometric  determination  of  chlorine  was  proposed  using  a  hard-crystalline  chloride-selective  electrode.  The  sample  was  decomposed by high-temperature sintering with a mixture of Na₂CO₃ and ZnO and subsequent leaching with water. The description of the  research method was given. The trueness of the analysis results was confirmed by the method of variation of the sample’s mass (n  =  10; t  =  2.26; P  =  0.95), and also by comparison with the results obtained  by the X-ray fluorescent method. The estimation of accuracy indicators of the method of ionometric chlorine determination in the objects  of blast furnace production was performed. The working interval of  the determined chlorine concentrations was 0.037 – 1.340  %  by mass.

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