Laboratory study of CaCO3 decomposition, influence of BOF converter slag
Metallurgical and Ecological Engineer School, University of Science and Technology Beijing, Beijing 100083, P.R. China
Received: 5 June 2016
Accepted: 17 November 2016
In this paper, the influence of BOF converter slag on CaCO3 decomposition was studied by laboratory experiments. FeOx, SiO2, MnOx and pre-melted slags were mixed with CaCO3 according to a predetermined proportion to simulate the environment of limestone in converter slag. TG-DTA results indicated that individual components of slag, including FeOx, SiO2 and MnOx, all had obvious effects on reducing the decomposition temperature of CaCO3. Multiple components of pre-melted slags had further reducing effects than individual components. XRD results showed that converter slag components would react with decomposition product of CaCO3 and generate solid solution or oxide, reducing the activity of CaO and the decomposition temperature of CaCO3. In the end, burned lime and natural limestone were mixed with pre-melted slag and TG-DSC results showed that limestone showed a stronger ability to react with pre-melted slag than burned lime does.
Key words: CaCO3 / limestone / converter slag / thermal analysis / decomposition temperature / XRD
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