Dextrin as a non-toxic depressant for pyrite in flotation with xanthates as collector

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

“…It has been shown that the adsorption difference of Dextrin-WY on sulfide minerals and on the talc surface resulted in different densities of hydroxyl groups that were exposed to solution [4]. Additionally, the research showed that the molecular weight was a significant factor that affected the performance of polymers, and the larger molecular weight polymers were more selective towards hydrophilic gangue minerals at starvation dosage [10][11][12][13]. In industry, guar gum is the most widely used depressant for hydrophobic gangue minerals.…”

Electrochemistry aspects of pyrite in the presence of potassium amyl xanthate and a lignosulfonate-based biopolymer depressant

“…Pyrite (FeS 2 ), a common constituent of base metal ore deposits, is widely associated with other base metal sulfide minerals (e.g., chalcopyrite) and precious minerals (e.g., gold) [1][2][3][4][5]. It is usually perceived as a gangue mineral and removed from valuable minerals by flotation which exploits the difference in surface properties [6,7].…”

Adsorption of modified dextrins to a hydrophobic surface: QCM-D studies, AFM imaging, and dynamic contact angle measurements

“…In this work, we have set out to further investigate the effect of polymers on the dynamic contact angle of a bubble attaching to a hydrophobic surface, using the quartz crystal microbalance with dissipation monitoring (QCM-D) to characterize the polymer adsorption (adsorbed amount, conformation, kinetics of adsorption, water content) [17,18], atomic force microscopy to characterize the adsorbed layer morphology, and novel measurements of dewetting using bubble-surface collisions monitored using high speed video capture techniques [19]. The polymers (regular wheat dextrin -Dextrin TY; phenyl succinate dextrin -PS Dextrin; and styrene oxide dextrin -SO Dextrin) have been selected to enable us to investigate subtle effects in adsorption and dewetting due to minor variation in the substitution chemistry of a commonly studied flotation depressant [5,20,21]. The model hydrophobic surface (mixed -CH 3 and -OH-terminated alkanethiol layer on gold) has been chosen to give a contact angle similar to many hydrophobic minerals [22].…”