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Recovery of zinc and iron from high iron-bearing zinc calcine by selective reduction roasting
Junwei Han,Wei Liu,Wenqing Qin,Bing Peng,Kang Yang,Yongxing Zheng 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
A novel method to recover zinc and iron from high iron-bearing zinc calcine by reduction roasting-lowacid leaching-magnetic separation was proposed. The effects of roasting and leaching conditions wereinvestigated and their optimum conditions were established. Meanwhile, the mineralogical changesduring the processes were characterized by XRD, VSM, SEM and LPSA. The results show the ZnFe2O4 inthe calcine was decomposed into ZnO and Fe3O4, and about 92.6% Zn was extracted from the roastedcalcine with reporting most of iron as magnetite into the residue. Finally, more than 90% Fe wasrecovered from the residue by magnetic separation method.
Drying features of microwave and far-infrared combination drying on white ginseng slices
Xiaofeng Ning,Yulong Feng,Yuan Juan Gong,Yong Liang Chen,Junwei Qin,Danyang Wang 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.4
In this study microwave and far-infrared combinationdrying were conducted to investigate the effect ofmicrowave and far-infrared heating mode switching pointwater content (SW), ginseng slice thickness, and far-infrareddrying temperature on drying indicators (surfacecolour difference, ginsenosides content, and surfaceshrinkage rate) and drying efficiency (drying time) duringthe process of drying white ginseng slices. Regardingmicrowave drying, the microwave drying time cannotexceed 150 s, and the ginseng slice water content cannot beless 50%. For the combination drying, SW, far-infrareddrying temperature and slice thickness increased, the colourdifference and surface shrinkage rate first decreasedand then increased, and the content of ginsenosides firstincreased and then decreased. In addition, the combinationdrying showed faster drying rate, higher ginsenosidescontents value, colour difference (DE) value and lowersurface shrinkage rate than single far-infrared drying.