摘要:

Interaction forces between hydrophobic coal particles and air bubbles during flotation are of significant academic and practical importance. When ionic surfactants are adsorbed by interacting surfaces, the flotation process can change due to changes in interfacial forces. An atomic force microscope (AFM) colloidal probe technique was used to measure the interaction forces between a coal surface and a polystyrene sphere in the presence of dodecylamine hydrochloride and sodium dodecylsulfate solutions. A significant dependence of these interaction forces on surfactant concentration was observed. In addition, zeta potential, bubble attachment time and contact angle measurements were performed, which together with AFM force measurements, give a more detailed description of this interfacial system involving two hydrophobic surfaces.

ISSN:0734-9343    

DOI:10.1080/07349340008945625

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

TurboFlotation is a new flotation system that has the advantage of large throughput per unit volume and low fluid inventory. The influence of process and design parameters on the performance of the TurboFlotation system as applied to coal flotation has been studied and statistical models developed to predict the performance of the system under various operating conditions. The study was done in two stages. The first part of the study involved the use of the Plackett-Burman screening experimental design to identify the important factors affecting the process performance, followed by a central composite design to optimize the system. Frother concentration, collector dosage, feed percent solids and feed flowrate were identified as the factors with significant effect on process performance.

ISSN:0734-9343    

DOI:10.1080/07349340008945626

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Washability analysis determines the best separation results that can be achieved in the operation of coal preparation plants. Unfortunately, there are no on-line techniques for determining this most fundamental information. It now appears possible to determine coal washability on-line through the use of X-ray computed tomography (CT) analysis. This paper presents the results for the development of a CT-based, on-line coal washability analyzer. The development of appropriate hardware and software necessary to adapt a CT analyzer for use in determining coal washability is discussed. Testing of the analyzer using well characterized coal samples is presented.

ISSN:0734-9343    

DOI:10.1080/07349340008945627

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The objective of this work is to study the feasibility of using vegetable oils which are available, renewable and nonpolluting energy resources as flotation reagents for the recovery of coal from coal fines wastes. To comply with this objective, crude SOC soyabean oil and a used AB olive oil of household origin were used as collectors in the flotation of the fines fraction of a coal dump from Ponferrada in Spain, which is currently being reclaimed in a nearby preparation plant. The results were evaluated by the yield of flotation concentrate, the ash content of the concentrate and the reagents cost. These results were compared with those obtained when a commercial reagent of mineral origin was employed, Ready to burn coal fines fuels were recovered from the waste by flotation with used AB and original SOC vegetable oils.

ISSN:0734-9343    

DOI:10.1080/07349340008945628

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor