Coaltech Research Association

Upgrading of Coal With The Aid of a Knelson Concentrator

R1500,00

Description

A lot of coal fines are generated during the crushing, screening and washing processes. Currently, it is difficult to successfully recover these coal fines. Conventional gravity processes generally have poor efficiencies in treating coal less than 1mm. The centrifugal separators have been proved to be the better route for processing these coal fines (Uslu, Sahinoglu and Yavuz, 2012). The study herein focused on the upgrading of coal with the aid of a Knelson concentrator (KC) specifically the deashing of coal fines (-1 mm size fraction). The experiments were conducted at the University of Pretoria with a laboratory KC-MD3 batch type Knelson concentrator.
Download to read more…

Related Products

R.P.van Wyk

Cost Evaluation of Different Medium Solids for Air Dense Medium Fluidized Bed Coal Separation

Kundayi Marshall Chagwedera

2017

University laboratory work on air fluidised bed separation, testing pyrrhotite, blast furnace slag, silica sand and coal discards against magnetite, for engineers considering waterless coal washing.

What this report foundMagnetite and pyrrhotite each gave the most uniform and stable fluidised bed densities, with bed density variation under 0.7 per cent.

R1500,00

R1500,00

Kundayi Marshall Chagwedera

What this report found

Magnetite and pyrrhotite each gave the most uniform and stable fluidised bed densities, with bed density variation under 0.7 per cent. A pyrrhotite and magnetite blend at a weight ratio of 40:60 beat magnetite alone, producing a product of 14.50% ash and 27.30 MJ/kg from a feed of 39.27% ash and 18.76 MJ/kg.

Demonstrate the efficiency of UAV-GPR for assessment of rehabilitation sites and detection of subsurface cavities

Michael van Schoor

2023

Field trials at two South African collieries comparing drone mounted ground penetrating radar against ground based surveys, for measuring rehabilitation soil thickness and locating shallow voids. For rehabilitation teams.

What this report foundGround based radar mapped rehabilitation soil profiles well enough to replace much of the auger sampling normally needed, and a 100 MHz system picked out...

R1500,00

R1500,00

Michael van Schoor

What this report found

Ground based radar mapped rehabilitation soil profiles well enough to replace much of the auger sampling normally needed, and a 100 MHz system picked out anomalies at about 5 to 6 m depth that were likely old mining voids and related subsidence. Penetration below roughly 6 m needs lower frequencies, which cost resolution and require larger antennas.

The impact of cattle grazing on rehabilitated land

Two annual surveys of species composition, biomass and soil sampling inside and outside fenced plots on rehabilitated pasture at an opencast colliery near Ogies, with benchmark sites for comparison.

What this report foundGrazing pressure on the rehabilitated block ran at roughly three times the estimated carrying capacity.

R1500,00

R1500,00

What this report found

Grazing pressure on the rehabilitated block ran at roughly three times the estimated carrying capacity. The sward was dominated by low quality grasses with a high proportion of bare ground and a raised erosion risk. Fenced exclosures over one year changed the abundance of a few species, but the vegetation showed no clear direction of recovery.

Shopping Basket