Absorbent assisted drying of spiral and flotation coal fines
R Erlank | August 2021
R1500,00
Description
This study investigated the drying of spiral and flotation coal filter cakes using activated alumina as an adsorbent. The experiments were done on a laboratory-scale rotating bed with the coal being dried in a cascading motion inside cylindrical vessels. The adsorbent-to-coal mass ratio, adsorbent particle size and adsorbent state (new, used or regenerated) were varied to study each variable’s effect on the drying performance. The coal’s heating values were measured at significant intervals during drying to do an energy balance on the process, determining the feasibility thereof from an economical and energy perspective. The study found that the spiral and flotation coal fines could be dried swiftly to a market specified moisture content of 10% w/w within two minutes’ contact sorption.
Related Products
Detection of Old Workings
2008
Review of earlier geophysical work plus literature, setting out method selection and test site requirements ahead of field trials, for engineers assessing undermined ground before development.
What this report foundMicrogravity, resistivity based methods including self potential, and time domain electromagnetics are identified as able to detect and delineate shallow old...
R1500,00
Microgravity, resistivity based methods including self potential, and time domain electromagnetics are identified as able to detect and delineate shallow old workings, with controlled source audio magnetotellurics useful below about 30 metres. How well each performs depends on target depth, the material filling the void and the overburden, and has never been quantified. Field trials were planned to close that gap.
Develop Methods to Prevent and Control Spontaneous Combustion Associated With Mining and Subsidence
2003
Fourth year of work at South African collieries, using borehole and infrared temperature monitoring, moisture testing and sealing trials, with control measures for opencast and underground operations.
What this report foundNo standard technique for predicting, controlling or extinguishing spontaneous combustion emerged, and the methods in use proved expensive and not routinely...
R1500,00
No standard technique for predicting, controlling or extinguishing spontaneous combustion emerged, and the methods in use proved expensive and not routinely successful. Because every mine differs, the work sets out a sequence of locating the fire, assessing the risk, choosing a strategy and method, then monitoring it. Separate control measures are given for old workings, exposed coal and spoil heaps.
Development of a Horizontal Winnower for the Beneficiation of Fine Coal
Proof of concept work on dry beneficiation of minus 6 mm coal, combining airflow modelling and simulation with a laboratory winnowing box, for plants short of process water.
What this report foundHorizontal air winnowing separated fine coal by particle size and density in laboratory experiments, supported by equation of motion modelling and...
R1500,00
Horizontal air winnowing separated fine coal by particle size and density in laboratory experiments, supported by equation of motion modelling and computational fluid dynamics. Modelling indicated that a chamber 0.6 m high and 1 m long is sufficient to displace any minus 6 mm particle at air velocities of 10 to 30 m/s.