Alexey Shapovalov, Roman Dema, Sergey Nefedyev, Constantine Solomonov, Rozina Yordanova
2017 Journal of Chemical Technology and Metallurgy   unpublished
A set of pilot experiments to improve pelletizing through the use of sinter charge humidification of water-soluble organic surface-active agents (surfactants) has been performed in the sintering plant of JSC "Ural Steel". It has been found that the surfactants use provides improved granularity of sinter charge and increase of its gas perme-ability during sintering that ensures better technology and quality. Maximum efficiency from the surfactants use is manifested in the area of optimum
more » ... of optimum moisture content of the sinter charge (7 %-8 %) at a flow rate of the experimental binder of 1,2 l/h-1,6 l/h (the surfactant concentration in the aqueous solution is 0,3 ml/l-0,4 ml/l). INTORDUCTION Sinter production is being carried out on four sin-tering machines on a sintering area of 84 m 2 at JSC "Ural Steel". Key performance indicators of the sinter plant at JSC "Ural Steel" for 2010-2014 are presented in Table 1. Despite the limited amount of fine-grained concentrates in the sinter charge, the acceptable specific lime consumption (29 kg/t) and the hot return use, the performance indicators of the sinter charge production of the JSC «Ural Steel» are among the lowest in the industry. This is primarily due to the poor technical condition of the vacuum system with limited power exhausters. However, it is difficult to expect a quick solution of the sinter plant technical modernization in the existing economic environment. Therefore, to improve the performance of the sinter plant at JSC «Ural Steel» special attention should be given to increase the quality of the sinter charge through changing the technology of its preparation. The preparation of the sinter charge to be sintered in the sintering plant of the JSC «Ural Steel» is carried out in two stages: (i) mixing (with humidity up to 3,5 %-4,0 %) in the mixing drum SB-2,8×6 that is installed under the angle of 2° to the horizon and rotating at the speed of 6.6 rpm; (ii) pelletizing and humidifying to the optimum level of 6,5 %-8,0 % in the drum SB-2,8×6 installed at an angle of 1°30' to the horizon and rotating at 6 rpm. The main factor determining the quality of the sinter charge preparation under the conditions of the existing production is the mode of humidification referring to the degree and stability of the moisture content of the sinter charge, the water properties, the manner and place of feed, the use of additives, etc. The consumption of