{"content":[{"text":"IUTAM Symposium on Growing solids \n June 23-27, 2015, Moscow, Russia \n a result, there occur gas inclusions and porosity. \n A decrease in chemical reaction temperature and \n aluminothermic melting intensity is possible by using thermite \n mixture components involving alkaline metals, for instance, Na and \n K. These metals make it possible to produce steel of high quality at \n low temperatures. They also affect the fluidity of dross generated in \n oxidation-reduction process. \n Thus, the aim of this investigation was to study KCl and NaCl \n impact on steel manufacturing process and steel properties in \n aluminothermic reduction of iron from mechanical engineering \n wastes. \n There were two problems stated. The first problem was to \n determine the influence of alkaline metals chlorides on the intensity \n of oxidation-reduction process and metal extraction. The second one \n was to study the impact of these chlorides on the properties of \n obtained alloys. \n It has been found experimentally that the mass content of NaCl \n in the thermite mixture more than 11% results in inhibition or full \n stop of thermochemical process of Fe reduction and interaction \n between accompanying components. The quality of obtained metal \n considerably deteriorates, and consequently, such content proves to \n be inappropriate. In the same way, the maximum permissible content \n of KCl in the thermite mixture comes out to be 13 %. \n The analysis of relationships between chloride content in \n thermite mixture and mass metal extraction as a result of \n aluminothermic process shows that the maximum efficiency is \n accomplished when NaCl content constitutes 3.5 % or when KCl \n content constitutes 4 %. \n When used NaCl and KCl in small amounts, mass metal \n extraction is more than estimated value (50 %) and experimental \n value (47 %) of metal extraction at thermite mixtures combustion \n without these chlorides. When NaCl and KCl content exceeds 7 % \n and 7.25 %, respectively, mass metal extraction becomes less than \n foregoing experimental value. \n 93","bbox":{"left":0.142788,"top":0.047714,"width":0.772107,"height":0.9031649999999999}}],"images_bbox":[],"images_bbox_not_text_overlap":[]}