Research On Pulverization Of Iron Sinter In Low-temperature Reduction And Non-chlorine Green Inhibitors

Iron ore prices jump with the demand of iron and steel market increasing and global high-quality iron ore resource continues to drop. Blast furnace is still can not be replaced in our ironmaking technology and the quality of the iron ore is strict with the ironmaking technology. In order to deal with the problem of iron ore resources, the quality of sinter should be improved.The subject of this study is the sinter reduction degradation behavior in low temperature, focusing on inhibition of this behavior, the method used in this experiment is to control raising temperature between the range of 200℃ and 900℃ in order to simulate blast furnace production and monitor how carbon monoxide concentration changes along with the temperature. Depending on characteristics of low temperature sinter reduction degradation, the degradation behavior can be categorized into 3 stages:initial degradation stage (200℃-400℃), dramatic degradation stage (400℃-600℃), and final degradation stage (600℃-900℃). Compare to the whole process, rather high with more than 50% degradation behavior included in second stage. The study also discuss about how different concentration of carbon monoxide can affect low temperature sinter reduction degradation behavior.Base on characteristics and mechanisms of low temperature sinter reduction degradation behavior, start as the non-chlorine green inhibitors, did researched on the effect of inhibition by multiple types of additive on sinter reduction behavior, and select the best ones:The non-chlorine inhibitor selected is composed mainly by 70% boric acid,10% calcium bicarbonate and 20% calcium metaborate. Inhibitor of choice is the best at a concentration of 1.5%, at which point the drum tumble tests of sinter has an RDI+6.3mm of 79.65% after 10 minutes. The final step will be is to test how the inhibitor influences the high temperature metallurgical properties of sinter and found out the selected inhibitor will not have direct impact on the high temperature metallurgical properties of sinter. However, the use of inhibitor revise the structure of sinter and therefore brings advantage to the high temperature metallurgical properties of sinter.