Effects of pH and ionic strength on kinetics of oil agglomeration of fine coal

Allen, Ray; Wheelock, T.D.

doi:10.1016/0892-6875(93)90166-k

Cited by 11 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous work in our laboratory had shown that changes in the turbidity of a suspension undergoing agglomeration provided a reliable means for observing agglomeration of dilute suspensions (refs. [1][2][3], and a report in the literature suggested that changes in agitator torque could provide a means for tracking agglomeration of concentrated suspensions (ref. 4).…”

Section: Introductionmentioning

confidence: 99%

Development of a gas-promoted oil agglomeration process. Technical progress report, October 1, 1993--September 30, 1994

Wheelock¹

1994

Self Cite

View full text Add to dashboard Cite

During the first year of the project two model mixing systems, which differed in size but were similar in design, were constructed and tested. The systems were equipped for measuring agitator speed and torque and for measuring the turbidity of coal particle suspensions undergoing agglomeration. Preliminary measurements of aqueous suspensions of coal particles showed that the Beer-Lambert law applies to such suspensions at least for low concentrations. Therefore, the measured turbidity can be used as an indicator of particle concentration and a means for monitoring the progress of oil agglomeration. However, the method is not applicable for large particle concentrations so a different technique was tested for monitoring the agglomeration of large concentrations. This technique involves measuring agitator torque and observing changes in torque while agitator speed is held constant. The results of preliminary tests of the technique were encouraging. In these tests significant changes in agitator torque were observed .when particle agglomeration took place as long as solids concentration of 25 w/v% or more were utilized.A number of agglomeration tests were conducted using either one or the other of the two monitoring techniques. Both methods showed that even very small amounts of air can promote the oil agglomeration of coal particles suspended in water. Even the amount of air dissolved in water at room temperature and pressure can affect the process providing the air is displaced from the solution by a slightly soluble agglomerant such as heptane. The apparent rate of agglomeration was observed to increase as more air was introduced and also as agitator speed was increased.

show abstract

Section: Introductionmentioning

confidence: 99%