A Longi LGS 500 wet high intensity magnetic separator(WHIMS) was used to concentrate a fine, low grade South African hematite ore. The ore was prepared into different size fractions and was subjected to changes in pul...A Longi LGS 500 wet high intensity magnetic separator(WHIMS) was used to concentrate a fine, low grade South African hematite ore. The ore was prepared into different size fractions and was subjected to changes in pulp density, magnetic field intensity and pulsation frequency which followed a 33 full factorial matrix. The concentrate mass yield and Fe grade were selected as the dependent responses to the changes. The analysis of variance(ANOVA) shows that the variables investigated are significant to the material's response to magnetic separation. This significance was in the order of magnetic field intensity followed by pulsation frequency and then pulp density. It was also noted that a single stage magnetic separation has a potential to upgrade a feed( 75 lm and 40% Fe) to a 55% Fe grade, as the pulsation frequency increases. In addition, the model predictions and actual data were in good agreement, reporting regression coefficients within acceptable ranges.展开更多
文摘目的 建立武汉地区表观健康成人血清可溶性转铁蛋白受体(soluble transferrin receptor,sTfR)和可溶性转铁蛋白受体与血清铁蛋白常用对数的比值(sTfR/log serum ferritin index,sTfR/lgSF)参考区间,为临床对铁缺乏和缺铁性贫血诊治提供依据。方法 选取武汉亚心总医院表观健康体检者和献血屋献血者273名,检测sTfR、其他铁代谢指标以及超敏C-反应蛋白(high sensitivity C-reactive protein,hsCRP),并计算sTfR/lgSF值,采用百分位数法(P2.5~P97.5)建立sTfR和sTfR/lgSF参考区间。采用Spearman相关分析评价sTfR、sTfR/lgSF与其他铁代谢指标、hsCPR相关性。结果 sTfR水平(M,mg/L)男女(1.01 vs 1.07)间差异不具统计学意义(P>0.05),但男性sTfR/lgSF水平明显低于女性(0.45 vs 0.62),差异有统计学意义(P<0.05);各年龄组间sTfR(M,mg/L)、sTfR/lgSF(M)比较,分别为(1.07 vs 1.02 vs 1.00)、(0.52 vs 0.53 vs 0.51),差异均不具统计学意义(P>0.05);sTfR参考区间为(0.72~1.68)mg/L,根据性别建立sTfR/lgSF参考区间为男性(0.31~0.88)、女性(0.37~1.19);相关性分析结果显示:sTfR、sTfR/lgSF与hsCRP无相关性(r=0.043,P>0.05)、(r=-0.064,P>0.05),而血清铁蛋白(serum ferritin,SF)、血清铁(serum iron,SI)、转铁蛋白饱和度(transferrin saturation,TSAT)与hsCRP均有相关性(r=0.128,P<0.05)、(r=-0.195,P<0.01)、(r=-0.173,P<0.01);sTfR与SF无相关性(r=-0.115,P>0.05),而sTfR/lgSF与SF有显著性相关(r=-0.685,P<0.01)。结论 初步建立了武汉地区表观健康成人血清sTfR及sTfR/lgSF的参考区间。sTfR和sTfR/lgSF不受炎性因子影响,对在炎症作用下血清铁蛋白升高的贫血患者,鉴别是否存在铁缺乏方面有着重大意义。
基金NRF SARCh I Clean Coal Technology, Mintek – South Africa and the University of the Witwatersrand for making funds available for the research study
文摘A Longi LGS 500 wet high intensity magnetic separator(WHIMS) was used to concentrate a fine, low grade South African hematite ore. The ore was prepared into different size fractions and was subjected to changes in pulp density, magnetic field intensity and pulsation frequency which followed a 33 full factorial matrix. The concentrate mass yield and Fe grade were selected as the dependent responses to the changes. The analysis of variance(ANOVA) shows that the variables investigated are significant to the material's response to magnetic separation. This significance was in the order of magnetic field intensity followed by pulsation frequency and then pulp density. It was also noted that a single stage magnetic separation has a potential to upgrade a feed( 75 lm and 40% Fe) to a 55% Fe grade, as the pulsation frequency increases. In addition, the model predictions and actual data were in good agreement, reporting regression coefficients within acceptable ranges.
