Browse Coal Washability and Float/Sink Study in the Standard Laboratories, Inc. catalog including Item #,Item Name,Description. COAL WASHABILITY. (STUDIES 4, 5 & 6). BY. J. W. WHITAKER. AND. G. G. SARKA R. FUEL RESEARCH INSTITUTE. JEALGORA1 MANBHUM, BIHAR. This paper summarizes the washability study con- ducted under the Coal Quality project. The aim of the study was to investigate and interpret washability.

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Coal preparation plant

A ROM stockpile is used to allow the washplant to be fed coal at lower, constant rate. From the overflow orifice, the coal goes into the overflow chamber, and is discharged to the next stage of the process. A mineralogical based particle density prediction model confirms that the float and washagility analysis data used in this study is valid.

Dewatering screens are used to remove water from the product. The refuse, to see what the plant missed.

Denver cells and Jameson Cells are two flotation methods used. Crushing reduces the overall topsize of the ROM coal so that it can be more easily handled and processed within the CPP. However, the pressure at the inlet of the cyclone is a very important factor and it is suggested to maintain a minimum pressure of around D x 9 x 9. Articles needing additional references from December All articles needing additional references All articles with unsourced statements Articles with unsourced statements from October Rotation speed is very slow, and drive torques can be high, especially for larger diameter thickeners.

washabklity The single float-sink test defines the relative amount of float-product and sink-reject that should result from the coal being washed in that preparation plant. If due to some reason the cyclone feed pump is not being able to deliver the required pressure at the inlet of the cyclone, feed should immediately be stopped and the pipelines, tank and pump should be properly checked for any jamming and any jamming should be properly cleaned before starting the circuit or the feed.


The second type of float-sink analysis tests a coal sample in a succession of density baths to determine the optimal density for separation of the coal from rocks and minerals. In general, separating washabiliity from intergrown minerals is increasingly difficult with decreasing particle size and concentration Stach and others, A cyclone is a conical vessel in which coal along with finely ground magnetite media is pumped tangentially to a tapered inlet and short cylindrical section at a predetermined flowrate and pressure followed by a conical section where the separation takes place.

Usually, a series of curves, based on different equations, is plotted: Relevant discussion may be found on the talk page. This type of analysis is used when the density of separating fluids can be adjusted in a preparation plant or when different plants with different density requirements could be used to wash a coal.

More controlled stockpiles are formed using stackers to form piles along the length of a conveyor, and reclaimers to retrieve the coal when required for product loading, etc. Originally, the network provided a group of geologists who served as resource persons for teachers. A cyclone is the heart of the washing unit in a Heavy Media Doal.

If a coal sample will be sent to a preparation plant that uses a fixed density washabulity separating coal from rock and minerals, then a single float-sink test may be done on a sample at the fluid density used in the plant.


Traditional float and sink analyses are undertaken to determine the washability of coal. Oil and Gas Permits Launch map. Graphite is only technically considered a coal type.

Show full item record. Front-end loaders and bulldozers can be used to push the coal into feeders.

Travelling, luffing boom stackers that straddle a feed conveyor are commonly used to create coal stockpiles. Drive torque is usually monitored continuously, as high densities could cause failure of the rakes and drive equipment.

Coal Washability Testing & Float-Sink Study at Standard Laboratories

The measured ash contents for the different float and discard fractions were within the expected limits. Water is removed from tailings to recycle water. It is a non moving part and hence requires very low maintenance. The coal delivered from the mine that reports to the coal preparation plant is called run-of-mine, or ROM, coal. This page was last edited on 23 Septemberat Some features of this site may not work without it. Filters, coak and thickeners are used in this part of the process.

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ROM coal is delivered with large variations in production rate of tonnes per hour tph. Contamination is usually introduced by the mining process and may include machine parts, used consumables and parts of ground engaging tools.

The curves can washabiloty be used to calculate the amount of rejects that would washabolity to be disposed of at specific densities. Larger coal stockpiles have a reduced rate of heat loss, leading to a higher risk of spontaneous combustion.