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Metal forming processes
Published in Andrew Livesey, Alan Robinson, The Repair of Vehicle Bodies, 2018
Ductility depends on tenacity or strength in tension and the ease with which a metal is deformed and is the property which enables a metal to be drawn out along its length, that is drawn into a wire. In wire drawing, metal rods are drawn through a hole in a steel die; the process is carried out with the metal cold, and the metal requires annealing when it becomes work hardened.
Optimisation of fine auriferous pyrite recovery using anionic and non-ionic collectors
Published in Mineral Processing and Extractive Metallurgy, 2018
In flotation of pyrite, the improved adsorption characteristics should result in improved floatability by increasing the bubble-mineral attachment tenacity, which would result in less mineral detachment and elutriation. The frother–collector interactions may also be increased and result in stronger mineral-bubble attachment. Hangone et al. (2005) reported that the mixed collector system produced a more stable froth because of the increased hydrophobicity, and wider range of particle sizes held in that froth. Better orientation of the different collectors to form a more evenly dispersed surface film than that of pure collectors was proposed by Plaskin and Zaitseva (1960). From the foregoing review of mechanisms, clearly any single collector will be less than satisfactory in recovering auriferous pyrite because that fine particles have low collision efficiencies with gas bubbles and float slowly (Bravo et al. 2005). The problem of recovering fine auriferous pyrite particles (<38 μm) continues to be a challenge for researchers (Valderrama and Rubio 1998; Forrest et al. 2001). Although there have been numerous reports on flotation of auriferous pyrite using the mixture of the two different collectors, a mixture collector of anionic/non-ionic collector has not been extensively studied in flotation of auriferous pyrite.
Optimization of reagent dosages with the use of response surface methodology and evaluation of test results with upgrading curves in graphite flotation
Published in Particulate Science and Technology, 2019
Ozcan Oney, Selcuk Samanli, Tomasz Niedoba, Agnieszka Surowiak, Paulina Pięta
The chemical nature of certain combinations of frothers and collectors may result in interactions occurring at the point of collision between mineral particles and bubbles which have been shown to decrease the induction time, increase the attachment efficiency, and increase the tenacity of attachment of the mineral to the bubble. The decreased induction time may result in improved kinetics of flotation and increased tenacity of the bubble–mineral bond which will result in better recoveries with less mineral detachment and elutriation (Shamsi et al. 2016). That is why, the addition of Aero 3477 promoter, as a collector, forms more stable froths in the graphite flotation. Besides, more selective separation can be provided on the fine graphite particles in the flotation step.
An unconventional approach in investigating wettability contact angle measurement in shale resources
Published in Petroleum Science and Technology, 2022
Salah Almudhhi, Mohammed Alostath, Waleed Al-Bazzaz, Hamid Sharifigaliuk, Ali Qubian
The second step for the unconventional mineralogy characterization is identifying the 18 minerals with their different physical properties (Sewailan and Al-Bazzaz 2019). There are 10 physical properties considered for the unconventional study of global shale rock minerals identification (Table 3). These physical properties are: chemical group, chemical sub-group, mineral name, chemical formula, mineral density, mineral cleavage, mineral tenacity, mineral hardness (Mohs Scale), mineral streak, mineral natural color, and mineral abundance in shale. Other physical properties will not be discussed in this study are mineral: luster, specific gravity, taste, odor, magnetism, and chemical reaction with acids.