Study on the Effect of Calcium Fluoride on Iron Extraction from Desulfurization Slag and Preparation of Diopside Microcrystalline Glass
As a pretreatment method for molten iron,KR stirring can achieve desulfurization through mechanical stirring.In the experiment,taking KR desulfurization slag as raw material,NH4Cl is used for leaching to obtain ammonium leaching desulfurization slag,and the metal iron is extracted and microcrystalline glass is prepared through carbon thermal reduction reaction,and the effect of calcium fluoride on iron extraction and microcrystalline glass preparation is studied.The results indicate that as the amount of CaF2 introduced increases,the iron blocks obtained by carbon thermal reduction transform from whole blocks to incomplete multiple blocks,and the reduced slag undergoes a transition from amorphous phase to diopside,a mixed crystal phase of diopside and plagioclase,while the microcrystalline glass gradually shifts from the main crystal phase of diopside to plagioclase.Combining the main crystal phase and crystallization growth index,when the CaF2 addition amount is 1%,the performance of the microcrystalline glass is optimal,and the crystallization growth index is 2.75,which is close to volume crystallization.
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