Study on the behavior of unburnt pulverized coal and reduction productions of TiO2 in high-titanium blast furnace slag
In this study,the viscosity of high-titanium blast furnace slags uniformly mixed with unburnt pulverized coal(UPC)was measured by using the method of rotating cylinder firstly.Then the distribu-tion and behavior of the residual UPC and the reduction products were analyzed according to the macro morphology of these samples and their microscopic morphology of different parts.It was found that TiO2 would inevitably be reduced by UPC,the high melting point reduction products such as Ti(C,N),TiCxOy and unburnt UPC distributed nonuniformly in the slag.As the initial UPC content increased from 0%to 5.51%,the total content of TiC and TiN increased from 0.456%to 2.515%.The high melt-ing point reduction products deposited downwards and aggregated,while the unburnt UPC floated up-wards and continued to react with TiO2 to form foam slag,resulting in a significant increase in both vis-cosity and its fluctuation.However,there were negligible residual unburnt UPC and high melting point reduction products in the middle of the slag.
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