Coal Preparation

Evaluation of Residual Frother Minimisation Strategies

Coal Preparation » Fine Coal

Published: December 18Project Number: C25013

Get ReportAuthor: Philip Ofori, Clint McNally | CSIRO

This project was undertaken to quantify the effectiveness of a number of approaches recommended for minimising unwanted frothing caused in part by residual frother in process streams in coal preparation plants.  In order to be able to make these assessments, a rapid, portable frother sensor able to detect the low residual frother concentrations was needed.  In the first part of the study, a reliable analytical sensor system and measurement technique were developed capable of determining low concentrations of frother as encountered in CHPP process streams. This instrument has been used to determine frother concentrations in aqueous solutions and slurry samples collected in laboratory, pilot-scale and CHPP process streams.

It examined frother concentration distribution in process streams and frother removal kinetics in flotation systems. The frother removal kinetics in two and three-phase batch flotation tests was found to be well described by the first order chemical reaction kinetics model. The role of frother adsorption onto coal particle surfaces in frother partition in three-phase flotation was also examined. It was found that surprisingly high proportion of initial frother added was adsorbed onto the coal water interface during the condition stage and the degree of adsorption was rank dependent. The higher the rank the greater the amount of frother adsorbed.

Frother removal in air stripping packed column system showed that it is effective in removing frother from aqueous solutions but at very high air/liquid ratios. Up to 80% of frother was removed in a pilot scale unit when operated at an air to liquid ratio of 680. Solids content of the liquid containing frother needed to be very low to prevent fouling and blockage of the channels in the packed bed. This is likely to make it difficult to apply it in the coal preparation environment.

The plant audit data showed that the actual frother dosage to primary flotation cells was lower than what was measured using the frother detector. This is an indication that the coal thickener was functioning to contain the frother associated with the concentrate within the ultrafines circuit and thus minimising the residual frother to other circuits where frothing is not required. It also showed that the frother partitioning to the product in the secondary flotation circuit was relatively small.


Health and safety, productivity and environment initiatives.


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


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