Hydrophobic Forces in Thin Water Films Stabilized by Dodecylammonium Chloride

Yoon, Roe‐Hoan; Aksoy, Bayram Suha

doi:10.1006/jcis.1998.5961

Cited by 71 publications

(72 citation statements)

References 31 publications

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“…The results showed that the use Al(OH) 3 -PAM alone led to a decrease in bitumen recovery due to the formation of large bitumen lumps during froth flotation. However, holistic improvements in bitumen recovery, froth quality and tailings settling were achieved when Al(OH) 3 -PAM was used in combination with Magnafloc 1011 at a low dosage. In the current work, a novel organic-inorganic hybrid polyacrylamide polymer, Al-PAM, was synthesized and used for the selective depression of ash-forming mineral matter in fine coal flotation.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, improving coal prices and technology have made the recovery of coal fines more viable, as they represent a notable economic resource base. At present, conventional froth flotation is the only commercially available method for the cleaning and recovering of coal fines [3]. The process utilizes differences in surface wettability between coal particles and ash-forming inorganic matter.…”

Section: Introductionmentioning

confidence: 99%

“…However, these polymeric surfactants were unable to reduce the ash content [7]. There is no literature available on the use of Al(OH) 3 -PAM (Al-PAM) hybrid polymers in coal flotation. However, Li et al investigated the effects of an Al-PAM hybrid polymer on the recovery of bitumen during the flotation of oil sands [13].…”

Section: Introductionmentioning

confidence: 99%

“…However, Li et al investigated the effects of an Al-PAM hybrid polymer on the recovery of bitumen during the flotation of oil sands [13]. In that study, Al(OH) 3 -PAM and partially hydrolyzed anionic PAM (Magnafloc 1011) were used either separately or together. The results showed that the use Al(OH) 3 -PAM alone led to a decrease in bitumen recovery due to the formation of large bitumen lumps during froth flotation.…”

Section: Introductionmentioning

confidence: 99%

“…In that study, Al(OH) 3 -PAM and partially hydrolyzed anionic PAM (Magnafloc 1011) were used either separately or together. The results showed that the use Al(OH) 3 -PAM alone led to a decrease in bitumen recovery due to the formation of large bitumen lumps during froth flotation. However, holistic improvements in bitumen recovery, froth quality and tailings settling were achieved when Al(OH) 3 -PAM was used in combination with Magnafloc 1011 at a low dosage.…”

Section: Introductionmentioning

confidence: 99%

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Ash Depression in Fine Coal Flotation Using a Novel Polymer Aid

Molatlhegi¹,

Alagha²

2016

IJCCE

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The current study investigated the effects of novel hybrid polyacrylamide polymers as ash (slime) depressants in fine coal flotation to enhance combustible recovery and ash rejection. Coal samples at P 80 of approximately 45 um with ~25% ash content were floated in the presence of in-house synthesized hybrid aluminum hydroxide polyacrylamide polymers (Al(OH) 3 -PAM, or Al-PAM). All flotation experiments were carried out in a 5-L Denver flotation cell. Various influencing factors were examined to optimize the flotation process in the presence of the Al-PAM polymers, including the Al-PAM dosage, Al-PAM conditioning time, impeller rotation speed and pulp pH. Comparative and synergistic studies were also performed using organic polyacrylamide polymers (PAMs), commercial dispersants and Al-PAM/dispersant system. Results showed a significant improvement in both combustible recovery and ash rejection at an Al-PAM dosage of 0.25 mg/L. The maximum combustible recovery obtained, at natural pH, with Al-PAM and Al-PAM/dispersant system was determined to be 70% and 66% at ash content of 7.74% and 7.4%, respectively. Zeta potential values of both the raw coal and concentrate products showed a large shift toward more positive values (from −50 mV to −13 mV), indicating a significant decrease in ash-forming minerals (slimes) when Al-PAM polymers were applied.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%