Ultrasonic treatment improves the performance of starch as depressant for hematite flotation

Abstract

Highlights Ultrasonic treatment of starch led to higher surface wettability and lower entrainment loss of hematite. A selective flocculation of hematite and an increased concentrate Fe grade were observed when using ultrasonic treated starch. Ultrasonic treatment of starch improved its dissolution and acidity with more amylose content. Increased amylose in the ultrasound treated starch may benefit the selective flocculation of hematite.

Ultrasound Pretreatment for Enhancing Fine and Ultrafine Flake Graphite Flotation Beneficiation

“…In the negative pressure zone of the vibration, the surrounding liquid could not replenish quickly enough, forming myriad tiny vacuum bubbles. In the positive pressure zone, the tiny bubbles rapidly collapse under pressure, generating a powerful impact wave due to the mutual collision between the liquids. , These results in an instantaneous high pressures of up to several thousand atmospheres. , The continuous occurrence of instant high pressures produces a series of small “explosions,″ continuously impacting the graphite surface. This process removes the mineral cover and achieves the role of cleaning the surface of graphite particles. − The SEM images (Figure ) of the RO, CFC, and UFC for both graphite ores at the highest yield conditions support this information from the literature.…”

“…These air flocs have been observed during the ultrasound process, and several studies have confirmed their formation. 37,48−51 Zhang et al (2022) reported that the application of ultrasound created air flocs that consisted of graphite particles, air bubbles, and reagents, which increased the floatability of graphite particles. The formation of air flocs is critical in the flotation process as it facilitates adhesion between graphite particles and air bubbles, promoting premineralization and direct up-floating of graphite particles into the concentrate.…”

Effect of ultrasound power on HCl leaching kinetics of impurity removal of aphanitic graphite

“…Graphite beneficiation is primarily achieved through flotation (using various reagents, both conventional and column flotation) and leaching (which includes chemical leaching, roasting and leaching, and microwave methods) [ [1] , [8] , [9] ]. Ultrasound treatment shows promise for achieving better flotation results in mineral processing when compared to conventional flotation methods [ [10] , [11] , [12] , [13] , [14] ]. This is due to its ability to eliminate slime coating, remove oxidation films, aid in desulfuration, generate tiny bubbles, disperse flotation reagents, and facilitate aggregation [ 15 ].…”

Green hematite depression for reverse selective flotation separation from quartz by locust bean gum

“…These facts emerge from using selective and eco-friendly flotation chemicals throughout the process, enhancing process efficiency and reducing potential environmental issues 7 , 8 . Thus, several investigations have been conducted to explore a green approach for upgrading low-grade hematite ores by considering eco-friendly biodegradable depressants 1 , 9 – 17 .…”

“…Different depressants such as Starch 18 – 21 , Dextrin 9 , 10 , 17 , Carboxyl Methyl Cellulose 12 , 13 , humic acids 14 , 15 , and Tannin 16 have been successfully examined for such a purpose. These studies indicated that developing environmentally friendly depressants for the reverse flotation separation of hematite would facilitate the green transition toward sustainable development and cleaner production.…”