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Non-salt roasting mechanism of V–Cr slag toward efficient selective extraction of vanadium
Zhichao Yao,Qing Zhang,Ling Wang,Wenjuan Zhang,Baozhong Ma,Chengyan Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Developing a clean method for the sustainable utilization of reducing slag containing vanadium and chromium(V–Cr slag) is necessary, with the non-salt roasting method exhibiting considerable potential. Inthis study, we conducted a detailed analysis of the mechanisms driving non-salt roasting of the V–Cr slagby investigating phase transformations, valence transition, and redistribution of vanadium and associatedtransition elements. Based on our findings, we performed efficient selective extraction experimentsand revealed that spinel (Fe,Mn)(V,Cr)2O4, the carrier of vanadium, is converted to acid-soluble products,including VO2, Mg2V2O7, and Mn2V2O7, and acid-insoluble products, such as (Fe,Cr)2O3, TiO2, MnO2, andFe2TiO5 at a roasting temperature of 700 C; At roasting temperatures > 850 C, MnO2 is converted to halfMn2V2O7 and half (Fe,Cr,Mn)2O3. Vanadium is separated from Fe, Cr, Ti, Si, and half Mn via selective leaching. Under optimized conditions, the leaching efficiency of V reached 94.55%, and those of Fe, Cr, Ti, Si,and Mn were 0.71%, 0.50%, 0.44%, 0.23%, and 50%, respectively. This study provides a technical and theoreticalbasis for cleaner and safer utilization of V–Cr slag.
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Study on flow fields of centrally fuel rich swirl burner and its applications
Zhichao Chen,Zhengqi Li,Jianping Jing,Lizhe Chen,Shaohua Wu,Yang Yao 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
Experiments on a single-phase test facility were done to optimize primary air outlet cones of a centrally fuel rich swirl coal combustion burner. On the basis of optimized results from the single-phase test, a three-component particle-dynamics anemometer was used to measure, in the near-burner region, the characteristics of gas/particle two-phase flows for the burner with two primary air outlet cones, on a gas/particle two-phase test facility. Velocities, RMS velocities and particle volume flux profiles were obtained. According to the results, the primary air outlet cone structure of the centrally fuel rich burner was matching a 670 ton per hour boiler. The performance of the burner on a 670 ton per hour boiler was studied.
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