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Use of halide solution to improve the RDI and RI of sinter : A Case Study

Sanjay Srivastava

The reduction-degradation index (RDI) of sinter is an important parameter to estimate the quality of sinter in low temperature zone (450-550?C) of blast furnace. Hence, it is of great importance to reduce the RDI of sinter which improve the permeability of blast furnace burden column for a stable and smooth performance resulting high yield and low consumption. In the last few years, many researchers have studied and reported the method for improving sinter quality by adding halide solution on to surface of the manufactured sintered ore. Some sinter producers also established from practices that spraying CaCl₂ solution on to the sinter surface will reduce the RDI of sinter.

In this paper, at Jindal Steel & Power Ltd., Raigarh, under laboratory conditions, a study was conducted on the RDI and RI (reduction index) of sinter, which was immersed with different concentrations of CaCl₂ solution. The lab results showed the RDI and RI of sinter decrease with the increase of Cl- concentration. With comprehensive consideration of the RDI and RI of sinter, when the concentration of Cl- reaches a certain level (let say X%), the RDI of sinter will be significantly reduced and at the same time RI will not be affected. On the basis of the laboratory results, a pilot plant study has been done and finally the same has been erected for the existing sinter plant successfully.

Key Words: RDI & RI, Sinter, CaCl₂, Blast Furnace