The oxidation induration and reduction swelling behavior of the chromium-bearing vanadium titanomagnetite pellets (CVTP) with B2O3 addition were investigated. Besides, the reduction swelling index (RSI) and compressiv...The oxidation induration and reduction swelling behavior of the chromium-bearing vanadium titanomagnetite pellets (CVTP) with B2O3 addition were investigated. Besides, the reduction swelling index (RSI) and compressive strength (CS) of the reduced CVTP were also examined using the simulated coke oven gas (COG). The results suggested that the CS of CVTP was increased from 2448 to 3819.2 N, while the porosity of CVTP was decreased from 14.86% to 10.03% with the increase in B2O3 addition amounts. Moreover, the B2O3 mainly existed in the forms of TiB0.024O2 and Fe3BO5 in both CVTP and the reduced CVTP. Specifically, the CS of the reduced CVTP was elevated from 901 to 956.2 N, while the RSI was reduced from 5.87% to 3.81% as the B2O3 addition amounts were increased. Taken together, B2O3 addition would facilitate the aggregation and diffusion of metallic iron particles, which contributed to reducing the formation of metal iron whiskers and weakening the reduction swelling behavior.展开更多
使用高温同步热分析仪,以10 K/min的升温速率对55%CaF2-20%CaO-3%MgO-22%Al2O3-x%B2O3(质量分数,x≤3.0)的失重率进行测定.根据测定结果确定挥发反应机理函数G(α)和动力学参数,并分析挥发反应机理.结果表明:随B2O3加入量增加,熔渣挥发...使用高温同步热分析仪,以10 K/min的升温速率对55%CaF2-20%CaO-3%MgO-22%Al2O3-x%B2O3(质量分数,x≤3.0)的失重率进行测定.根据测定结果确定挥发反应机理函数G(α)和动力学参数,并分析挥发反应机理.结果表明:随B2O3加入量增加,熔渣挥发失重量降低;温度≥1 673 K时,熔渣挥发机理函数为G(α)=α,符合Mampel power law (n=1),熔渣挥发受挥发组元的形核长大控制;加入质量分数0.5%B2O3使熔渣挥发活化能从458.69 kJ·mol^-1降低至431.54 kJ·mol^-1,但B2O3加入量≥1.0%,活化能变化不明显;B2O3加入可抑制熔渣吸潮,为降低熔渣烘烤成本,熔渣中B2O3加入量应≥1.0%;提高炉内CaF2分压,可大幅降低熔渣的挥发失重及熔渣挥发对冶炼铸锭质量的影响.展开更多
Hybrid nanomaterials have attracted considerable interest in environmental science,analytical chemistry and atomic spectroscopy.In the present study,a column solid phase extractioo procedure was developed for the sepa...Hybrid nanomaterials have attracted considerable interest in environmental science,analytical chemistry and atomic spectroscopy.In the present study,a column solid phase extractioo procedure was developed for the separation and preconcentration of indium in various matrixes by using hybrid nanomaterial B_2O_3/ZrO_2(HNMBZ).Various experimental and analytical parameters such as sample solution pH,sample solution volume,flow rate of sample solution and eluent,volume and concentration of eluent aod amount of HNMBZ,effect of common matrix ions and capacity of sorbent were investigated.The adsorbed metal ions on HNMBZ were eluted with 6mL of 1mol·L^(-1 )HNO_3solutions and their concentrations were determined by high-resolution continuum source flame atomic absorption spectrometry(HR-CS FAAS).Under the optimized conditions,detection limits for indium for 3pixels and 5pixels were found as 0.20and 0.16μg·L^(-1),respectively.The accuracy of the procedure was checked by spiked water samples.The developed procedure was successfully applied to real samples for the separation and determination of indium.展开更多
基金Projects(51674084,51174051,51574082)supported by the National Natural Science Foundation of China
文摘The oxidation induration and reduction swelling behavior of the chromium-bearing vanadium titanomagnetite pellets (CVTP) with B2O3 addition were investigated. Besides, the reduction swelling index (RSI) and compressive strength (CS) of the reduced CVTP were also examined using the simulated coke oven gas (COG). The results suggested that the CS of CVTP was increased from 2448 to 3819.2 N, while the porosity of CVTP was decreased from 14.86% to 10.03% with the increase in B2O3 addition amounts. Moreover, the B2O3 mainly existed in the forms of TiB0.024O2 and Fe3BO5 in both CVTP and the reduced CVTP. Specifically, the CS of the reduced CVTP was elevated from 901 to 956.2 N, while the RSI was reduced from 5.87% to 3.81% as the B2O3 addition amounts were increased. Taken together, B2O3 addition would facilitate the aggregation and diffusion of metallic iron particles, which contributed to reducing the formation of metal iron whiskers and weakening the reduction swelling behavior.
文摘使用高温同步热分析仪,以10 K/min的升温速率对55%CaF2-20%CaO-3%MgO-22%Al2O3-x%B2O3(质量分数,x≤3.0)的失重率进行测定.根据测定结果确定挥发反应机理函数G(α)和动力学参数,并分析挥发反应机理.结果表明:随B2O3加入量增加,熔渣挥发失重量降低;温度≥1 673 K时,熔渣挥发机理函数为G(α)=α,符合Mampel power law (n=1),熔渣挥发受挥发组元的形核长大控制;加入质量分数0.5%B2O3使熔渣挥发活化能从458.69 kJ·mol^-1降低至431.54 kJ·mol^-1,但B2O3加入量≥1.0%,活化能变化不明显;B2O3加入可抑制熔渣吸潮,为降低熔渣烘烤成本,熔渣中B2O3加入量应≥1.0%;提高炉内CaF2分压,可大幅降低熔渣的挥发失重及熔渣挥发对冶炼铸锭质量的影响.
基金the Scientific and Technological Research Council of Turkey(TUBITAK Grants no.110T111,214Z221)
文摘Hybrid nanomaterials have attracted considerable interest in environmental science,analytical chemistry and atomic spectroscopy.In the present study,a column solid phase extractioo procedure was developed for the separation and preconcentration of indium in various matrixes by using hybrid nanomaterial B_2O_3/ZrO_2(HNMBZ).Various experimental and analytical parameters such as sample solution pH,sample solution volume,flow rate of sample solution and eluent,volume and concentration of eluent aod amount of HNMBZ,effect of common matrix ions and capacity of sorbent were investigated.The adsorbed metal ions on HNMBZ were eluted with 6mL of 1mol·L^(-1 )HNO_3solutions and their concentrations were determined by high-resolution continuum source flame atomic absorption spectrometry(HR-CS FAAS).Under the optimized conditions,detection limits for indium for 3pixels and 5pixels were found as 0.20and 0.16μg·L^(-1),respectively.The accuracy of the procedure was checked by spiked water samples.The developed procedure was successfully applied to real samples for the separation and determination of indium.
