ACARP ACARP ACARP ACARP
Coal Preparation

Froth Washing in Mechanical Cells

Coal Preparation » Fine Coal

Published: May 01Project Number: C7041

Get ReportAuthor: Bruce Atkinson, Noel Lambert, Graeme Jameson | University of Newcastle, OJK Technology, TUNRA

The objectives of this project were:

  • To demonstrate the effectiveness of froth washing on full-scale conventional flotation cells.
  • To develop design parameters for installation to any mechanical flotation bank.

Froth washing is used in mineral flotation to reduce the amount of entrained gangue material that reports with the valuable mineral in the froth concentrate. Clean water is introduced into or on top of the froth, and percolates downwards through it, replacing the water that has been entrained by bubbles. Since this water initially contains ash particles in the same concentration as in the tailings from the flotation cell, entrainment can lead to high-ash flotation product. If clean water is applied, it can replace most or all of the entrained water, leading to low-ash flotation product.

Froth washing was carried out on full-scale operating flotation cells at two coal preparation plants - Norwich Park CHPP, Queensland; and Macquarie CHPP, Hunter Valley. The campaign at Norwich Park gave inconclusive results, because of the inability to obtain sufficient wash water.

A successful campaign was conducted at the Macquarie CHPP. On average, there was a decrease in product ash from 10.6 to 9.1 percent. There was a reduction in the mass yield from 79 to 75 percent, and in the combustibles yield from 93 to 90 percent. Typical wash water ratios ranged from 1.1 to 4.9. The yield-ash data fitted well on an ultimate flotation response curve for the coal. The effect of the wash water was to move the point down the curve.

A design method applicable to any mechanical flotation cell has been developed. A tray distributor is used, constructed from HDPE or other corrosion-resistant material, with 5 mm diameter holes drilled on a triangular pattern. It is recommended that the installation should allow for wash water application rates of 0.13 to 0.3 cm/s on a superficial basis, corresponding to water rates of 4.7 to 10.8 m3/m2/hr.

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