ACARP ACARP ACARP ACARP
Coal Preparation

Washability Analysis of Fine Coal using a Water-Based Method

Coal Preparation » General

Published: June 14Project Number: C21046

Get ReportAuthor: Kevin Galvin, Simon Iveson & David Hunter | University of Newcastle

The aim of this project was to develop a water-based method for generating washability data and analysing the partition performance of separation operations. Fractionation experiments were performed in a laboratory Reflux Classifier on coal samples in the -0.250 +0.038 mm, - 2.0 +0.25mm and -16 +2.0mm size ranges. For the finest size fraction, using 1.7mm channels, using pure water as the fluidising medium gave a near perfect match to the float-sink curve.

 

For the coarser samples, the channel spacing had to be increased in order to accommodate the larger particles. This caused a reduction in performance when pure water was used. However, by using glycerol solutions to promote laminar high-shear rate flow, performance was improved, resulting in cumulative yield-ash results that closely matched those obtained by the float-sink method.

 

This excellent agreement with the float-sink results across a range of sizes from 0.038mm up to 16.0mm means that the laboratory Reflux Classifier fractionation method can potentially be used to analyse feed, product and reject samples to determine the partition performance of separation processes. Three case studies were undertaken to test the method. In each case, samples of the feed, product and reject streams were collected, processed in the batch Reflux Classifier, and then analysed to determine the partition performance. This result was compared to the partition curves calculated from float-sink measurements.

 

Given the great uncertainty in calculated partition values, we can instead evaluate the laboratory water-based method based on how well it measures the density distribution of material in each flow sample. When the laboratory water-based fractionation ash data was converted into a density distribution, it gave close agreement with the float-sink data. Hence, the method has done as well as can be expected. Small discrepancies in measuring the amount of near-density material amplify uncertainties in partition curves. This applies to any method, and should not be seen as a negative finding against the water-based fractionation method.

 

The laboratory Reflux Classifier fractionation method has been demonstrated to be able to reliably and accurately measure the yield-ash curve of coal samples varying from 0.038 mm up to as large as 16 mm. Under ideal conditions where the samples are representative and there is a sufficient mass of near cut-point density material, the method has also been proven to be capable of accurately obtaining the partition curve. Even when the coal is fragile, and hence vulnerable to significant breakdown in water, use of the glycerol solution reduces the level of attrition sufficiently to still obtain quite reasonable agreement.

Underground

Health and safety, productivity and environment initiatives.

Underground

Open Cut

Safety, productivity and the right to operate are priorities for open cut mine research.

Recently Completed Projects

C19024Establishing Ecologically Sustainable Mine Water Release Criteria In Seasonally Flowing Streams

Extreme rainfall conditions in the Fitzroy Catchment over an approxi...

C25030Coal Mine Open Pit Final Void Closure And Relinquishment - Addressing Uncertainty In Coal Mine Environmental Planning

This report addresses uncertainties faced by coal mine operators whe...

C27046Estimation Of True Deformation Vector From Slope Radar Monitoring

Slope deformation radar monitors are now widely used in open cut coa...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C27004Improving Coal Flotation With Oscillatory Air Supply

This report provides detailed information on coal flotation with os...

C25018Improving Solids Recovery And Moisture Reduction In Ultrafine Coal Dewatering

This report provides detailed information on fine coal dewatering in...

C27028Lab Froth Flotation Testing Guide With Coal Quality

Correct outcomes from laboratory froth flotation testing in coal bor...

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Recently Completed Projects

C26039Nanoporosity In Cokes: Their Origin, Control And Influence On CO2 Reactivity

This project using the outcomes of previous project C24060, examine...

C28063A Comprehensive Technical Review Of High-Efficiency Low-Emission (HELE) Pulverised Coal Combustion Technologies For Power Generation

Research and development has been undertaken worldwide to realise co...

C28064Carbon Structure Transformation During Coking Of Australian Coking Coals: Better Understanding The Coke Formation

Carbon structures of coke that are formed during the plastic layer a...

Technical Market Support

Mine Site Greenhouse Gas Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C28076Selective Absorption Of Methane By Ionic Liquids (SAMIL) - Phase 2 Demonstration In A Packed Bed Reactor

An alternative approach to high temperature oxidation of ventilation...

C26004CFD Modelling Of Reverse Thermal Oxidisers For VAM Abatement - CFD Modelling Of Fixed-Bed RTO Devices

The project is part of a larger multi‐phase program of study a...

C27058Technological Assessment Of A Recycle Reactor For VAM Abatement

Underground coal mining emits high volumes of methane, diluted in ve...

Mine Site Greenhouse Gas Mitigation

Low Emission Coal Use

Step-change technologies aimed at reducing greenhouse gas emissions.

Recently Completed Projects

C17060BGasification Of Australian Coals

Four Australian coals were trialled in the Siemens 5 MWth pilot scale ga...

C17060AOxyfuel Technology For Carbon Capture And Storage Critical Clean Coal Technology - Interim Support

The status of oxy-fuel technology for first-generation plant is indicate...

C18007Review Of Underground Coal Gasification

This report consists of a broad review of underground coal gasification,...

Low Emission Coal Use

Mining And The Community

The relationship between mines and the local community.

Recently Completed Projects

C16027Assessing Housing And Labour Market Impacts Of Mining Developments In Bowen Basin Communities

The focus of this ACARP-funded project has been to identify a number...

C22029Understanding And Managing Cumulative Impacts Of Coal Mining And Other Land Uses In Regions With Diversified Economies

The coal industry operates in the context of competing land-uses that sh...

C23016Approval And Planning Assessment Of Black Coal Mines In NSW And Qld: A Review Of Economic Assessment Techniques

This reports on issues surrounding economic assessment and analysis ...

Mining And The Community

NERDDC

National Energy Research,Development & Demonstration Council (NERDDC) reports - pre 1992.

Recently Completed Projects

1609-C1609Self Heating of Spoil Piles from Open Cut Coal Mines

Self Heating of Spoil Piles from Open Cut Coal Mines

1301-C1301Stress Control Methods for Optimised Development...

Stress Control Methods for Optimised Development and Extraction Operations

0033-C1356Commissioned Report: Australian Thermal Coals...

Commissioned Report: Australian Thermal Coals - An Industry Handbook

NERDDC