Coaltech Research Association

DyVar Pilot Test Report

Tecroveer

Batch pilot trial of a salt concentration unit on saline coal mine effluent at the eMalahleni reclamation plant, for mines weighing brine treatment and salt recovery.

What this report found

A pilot brine concentrator treated Stage 3 reject effluent from a mine water reclamation plant, raising total dissolved solids from 24 g/L to 154 g/L at 88 per cent water recovery. The condensate met the national potable water specification. A separate run concentrated brine from 76 g/L to 145 g/L, solid salts were precipitated, and no scaling or fouling was seen.

R1500,00

Description

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What this report foundExisting thermal imagery of the Witbank coalfield was traced to its holders and assessed for format, quality, resolution and coverage, then brought into one...

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What this report found

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BCI Chemical Research & Analysis – Eutectic Freeze Crystallisation

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Desktop market and technology review of brine from coal related waste, covering global and South African demand, plant energy use and laboratory crystalliser results, for water treatment planners.

What this report foundEutectic freeze crystallisation was compared with evaporative crystallisation as a route for treating hypersaline mine brine.

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Jacques Magliolo

What this report found

Eutectic freeze crystallisation was compared with evaporative crystallisation as a route for treating hypersaline mine brine. Optimised commercial evaporative crystallisers use 40 to 50 kWh per cubic metre of feed. Laboratory work measured a eutectic temperature of -21.1 degrees Celsius for pure sodium chloride solution, and found that a large difference between coolant and solution caused scaling on the heat exchanger wall.

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Underground Trials of Seismic-counter and Goafing Characteristics in Pillar Extraction

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Underground trials at South African collieries of a seismic early warning instrument first developed for an Australian longwall, with analysis of how roof layers fail during pillar extraction.

What this report foundA stand-alone device was built that detects micro-seismicity within 100 m of the roof and raises an alarm when preset thresholds are exceeded, giving early...

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What this report found

A stand-alone device was built that detects micro-seismicity within 100 m of the roof and raises an alarm when preset thresholds are exceeded, giving early warning of goafing. Input parameters proved not to vary with geotechnical setting. Man-made noise triggering false alarms remained the main obstacle, addressed by signal conditioning and sensor placement.

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