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Chromium enrichment in different crystalline phases of Cr-containing slag under various basicities and equilibrium temperatures

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Journal of Iron and Steel Research(International) 2022年第9期29卷 1412-1422页

作者： Shao-wen Wu Yan-ling Zhang Shuai Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The effects of basicities and equilibrium temperatures on the enrichment of chromium in different mineral phases of synthesized argon-oxygen decarburization slags were investigated to understand the cr concentrating behavior into Mg(cr,Al)2O4 spinel phase and to determine the leaching stability of Cr-containing slag.The results showed that when the basicity decreased from 1.0 to 0.6 and temperatures decreased from 1600 to 800℃,the cr content of amorphous phase and crystalline phase gradually decreased,with a subsequent increase in the cr content of spinel phase.The range of cr enrichment in spinel of slags S1,S2,and S3 is 92.03-96.89,91.63-96.36,and 90.67-95.42,respectively.The mass fraction and the size of spinel increased with the decreasing equilibrium temperatures,and the cr leaching values decreased simultaneously.Therefore,the trend of the amount of cr-related ions in the leachate was consistent with the trend of cr in the amorphous phase,diopside,and akermanite.The results suggest that the lower basicity and equilibrium temperatures could be conducive to stabilizing cr into spinel phase to minimize cr leaching into the environment.

关键词： Chromium enrichment Leaching behavior Basicity Temperature Cr-containing slag

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Effect of Al_(2)O_(3) content on the viscosity and structure of CaO-SiO_(2)-cr_(2)O_(3)-Al_(2)O_(3) slags

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1522-1531页

作者： Fang Yuan Zheng Zhao Yanling Zhang Tuo Wu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The effect of Al_(2)O_(3) content on the viscosity and structure of CaO-SiO_(2)-cr_(2)O_(3)Al_(2)O_(3) slags was investigated to facilitate recycling of cr in steelmaking slags.The slags exhibit good Newtonian behavior at high temperature.The viscosity of acidic slag first increases from 0.825 to 1.141 Pa·s as the Al_(2)O_(3) content increases from 0 to 10wt%and then decreases to 1.071 Pa·s as the Al_(2)O_(3) content increases further to 15wt%.The viscosity of basic slag first increases from 0.084 to 0.158 Pa·s as the Al_(2)O_(3) content increases from 0 to 15wt%and then decreases to 0.135 Pa·s as the Al_(2)O_(3) content increases further to 20wt%.Furthermore,cr_(2)O_(3)containing slag requires less Al_(2)O_(3) to reach the maximum viscosity than cr_(2)O_(3)free slag;the Al_(2)O_(3) contents at which the behavior changes are 10wt%and 15wt%for acidic and basic slags,respectively.The ac-tivation energy of the slags is consistent with the viscosity results.Raman spectra demonstrate that[AlO_(4)]tetrahedra appear initially and were replaced by[AlO_(6)]octahedra with further addition of Al_(2)O_(3).The dissolved organic phosphorus content of the slag first increases and then de-creases with increasing Al_(2)O_(3) content,which is consistent with the viscosity and Raman results.

关键词： viscosity structure Cr-containing slag Raman spectra

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