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Effect of surface roughness on the flotation separation of hematite from fine quartz
Zhanglei Zhu,Zhen Li,Wanzhong Yin,Bin Yang,Ningning Zhang,Jinzhou Qu,Songjiang Chen,Jing Chang,Yuexian Yu,Lijun Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
Although the effect of surface roughness on the floatability of a single mineral has been investigatedextensively, a systematic study for the effect of surface roughness on the flotation separation of differentminerals, e.g., flotation recovery, has never been dwelled. To fulfill this gap, in this study, the effect of surfaceroughness on the flotation separation of hematite from quartz was investigated with a series ofexperiments and detections. Micro-flotation experiments demonstrated that hematite particles withhigher roughness resulted in higher recoveries for both hematite and quartz, but the improvement ofhematite recovery was more significant, which promoted the flotation separation of hematite fromquartz with a higher separation index (SI). Adhesion force measurements revealed that after interactingwith 125 mg/L sodium oleate at pH 9, increasing nano-scaled roughness improved the hydrophobicity ofhematite surface, and reduced the adhesion force of water droplet on hematite surface. Scanning ElectronMicroscope – Energy Dispersive Spectrometer observations confirmed that increasing nano-scaled roughnessincreased the number of fine quartz particles coating on hematite surface. Combined with the analysisof adhesion of water droplet and observation of fine particles coating on hematite surface, the effectof surface roughness on minerals flotation separation could be better understood.
Adsorption separation of vinyl chloride and acetylene on activated carbon modified by metal ions
Song Jiang,Gongying Wang,Tong Chen,Lilei Zhang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
This work mainly involved the adsorption separation of vinyl chloride and acetylene on modified activated carbons. Six metal ions with different hardness were loaded on activated carbon respectively. The effect of metal ions on the adsorption separation performance of vinyl chloride and acetylene was investigated. The experimental results shown that the separation factor of C2H3Cl to C2H2 over modified activated carbon followed the order: Al(III)/AC > Mg(II)/AC > Fe(III)/AC > AC > Zn(II)/AC Cu(II)/AC > Ag(I)/AC. The effect of the hardness of metal ions on the adsorption capacity of C2H2 was more remarkable than that of C2H3Cl, thus the separation factor of C2H3Cl to C2H2 increased with the rising of absolute hardness of the metal ions.