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Effect of Power Ultrasound on Wettability and Collector-Less Floatability of Chalcopyrite, Pyrite and Quartz
Minerals ( IF 2.5 ) Pub Date : 2021-01-04 , DOI: 10.3390/min11010048
Ahmad Hassanzadeh , Hamed Gholami , Safak Gökhan Özkan , Tomasz Niedoba , Agnieszka Surowiak

Numerous studies have addressed the role of ultrasonication on floatability of minerals macroscopically. However, the impact of acoustic waves on the mineral hydrophobicity and its physicochemical aspects were entirely overlooked in the literature. This paper mainly investigates the impact of ultrasonic power and its time on the wettability and floatability of chalcopyrite, pyrite and quartz. For this purpose, contact angle and collectorless microflotation tests were implemented on the ultrasonic-pretreated and non-treated chalcopyrite, pyrite and quartz minerals. The ultrasonic process was carried out by a probe-type ultrasound (Sonopuls, 20 kHz and 60 W) at various ultrasonication time (0.5–30 min) and power (0–180 W) while the dissolved oxygen (DO), liquid temperature, conductivity (CD) and pH were continuously monitored. Comparative assessment of wettabilities in the presence of a constant low-powered (60 W) acoustic pre-treatment uncovered that surface of all three minerals became relatively hydrophilic. Meanwhile, increasing sonication intensity enhanced their hydrophilicities to some extent except for quartz at the highest power-level. This was mainly related to generation of hydroxyl radicals, iron-deficient chalcopyrite and elemental sulfur (for chalcopyrite), formation of OH and H radicals together with H2O2 (for pyrite) and creation of SiOH (silanol) groups and hydrogen bond with water dipoles (for quartz). Finally, it was also found that increasing sonication time led to enhancement of liquid temperature and conductivity but diminished pH and degree of dissolved oxygen, which indirectly influenced the mineral wettabilities and floatabilities. Although quartz and pyrite ultrasound-treated micro-flotation recoveries were lower than that of conventional ones, an optimum power-level of 60–90 W was identified for maximizing chalcopyrite recovery.

中文翻译:

功率超声对黄铜矿,黄铁矿和石英的润湿性和无极浮游性的影响

宏观上,许多研究已经探讨了超声作用对矿物漂浮性的作用。然而,声波对矿物疏水性及其物理化学方面的影响在文献中被完全忽略了。本文主要研究超声波功率及其时间对黄铜矿,黄铁矿和石英的润湿性和漂浮性的影响。为此,对超声预处理和未经处理的黄铜矿,黄铁矿和石英矿物进行了接触角和无收集器微浮选试验。超声过程是通过探头式超声(Sonopuls,20 kHz和60 W)在各种超声时间(0.5–30分钟)和功率(0–180 W)下进行的,而溶解氧(DO),液体温度,连续监测电导率(CD)和pH。在持续的低功率(60 W)声音预处理下对润湿性的比较评估发现,所有三种矿物的表面都变得相对亲水。同时,除最高功率水平的石英外,增加超声强度会在一定程度上增强其亲水性。这主要与生成羟基自由基,缺铁的黄铜矿和元素硫(用于黄铜矿),OH和H自由基以及H的形成有关2 O 2(用于黄铁矿)和形成SiOH(硅烷醇)基团并与水偶极子形成氢键(用于石英)。最后,还发现增加超声处理时间会导致液体温度和电导率的提高,但会降低pH和溶解氧的程度,从而间接影响矿物的润湿性和漂浮性。尽管石英和黄铁矿超声处理的微浮选回收率低于常规浮选回收率,但为使黄铜矿回收率最大化,最佳功率水平被确定为60–90W。
更新日期:2021-01-04
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