Coal Preparation

Density/Percent Solids Gauge for Slurries

Coal Preparation » Process Control

Published: November 00Project Number: C9043

Get ReportAuthor: Allen Hundley | Offshore Scientific

Offshore Scientific P/L has completed a preliminary study of an acoustic based percent solids / density gauge to be used in coal preparation circuit pipes. This low cost scoping study forms a basis for possible future development of a density gauge that would be low cost, and an alternative to nuclear-based gauges currently in use for measuring the material properties of slurries flowing in pipes.

This project was performed in co-operation with the CSIRO QCAT facility and staff in Pinjarra Hills, Qld, with the CSIRO acting in a sub-contract role with testing, advisement and reporting responsibilities. A separate (independent) report compiled by CSIRO staff can be found appended to this document.

The goals of this project included:

  1. To measure the effect of an enclosed pipe environment upon underwater acoustic sensors and gauge system proven to be successful in "open water" environments.
  2. To measure the effect of fluid mix flow upon these sensors and system.
  3. To obtain an indication of inherent, or potential accuracy of this system.
  4. To obtain estimates of cost and technical effort required to bring the system up to operational performance levels.

Two series of tests were carried out. The first test series was an initial "quick look" series of data acquisition at the CSIRO facility to obtain estimates of the electronic, acoustic and data acquisition requirements needed for a more complete second test series. The second test series was completed in October 2000.

This final test used improved electronics, sensors and data acquisition techniques. Three mixes were used for the flowing slurries in the 6 inch diameter pipe:

a) Thickener feed/rejects
b) Flotation feed ROM coal
c) Dense Medium cyclone/magnetite

Overall, the results of this preliminary study were promising. With respect to the objectives listed above, it was found that the enclosed pipe environment did not affect the performance of this technology. Next, the effect of fluid flow upon this technology was significant. This effect includes turbulence, bubbles and other sources of flow noise. It was found that reasonable results could be obtained at lower flow velocities (typically less than 1.5 metres per second). Testing at higher velocities offset the gauge data, and at high velocities (greater than 2 m/s) the gauge had difficulties obtaining quality measurements. The accuracy of the system was good (as judged by CSIRO staff) for two out of the three mixes at lower flow velocities. Finally, it is estimated that further work involved with the development of this system in order to bring it up to operational levels would be at least several multiples of the cost and effort used for this project.


Health and safety, productivity and environment initiatives.

Recently Completed Projects

C27039True Triaxial Strength Of Coal Measure Rocks And Its Impact On Roadway Stability And Coal Burst Assessment

Rocks in the ground are subject to a range of stresses. The stresses...

C3063Underground Vehicle Design Standards And Statutory Implications

The Australian underground diesel vehicle fleet has evolved since di...

C3064Conveyor Belting And Lagging Shear Characteristics - Drive Drum Slip

The primary aim of this project was to investigate the relationsh...


Open Cut

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

Recently Completed Projects

C26029Geological Controls On Fluorine And Phosphorus In Bowen Basin Coals

Increasing global restrictions on fluorine in product coal prompted ...

C28033Raw Ash To Yield Relationships

Correct outcomes in yield predictions for product ash from coal bore...

C27038Establishing Self-Sustaining And Recognisable Ecological Mine Rehabilitation

In recent years an increasing interest has been placed on mining ope...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C27064Dry Beneficiation Using FGX And X-Ray Sorters

Conventional dry processing methods engage a single beneficiation de...

C26010Multi-Sloped Screening Efficiency With Changing Strokes, Frequencies, Feed Solids And Feed Rates-Pilot Plant Study

Optimising multi-sloped screens is often described as an art and the...

C28059Impact Of Water Quality In Coal Handling And Preparations Plants

The objective of this project was to deliver a concise reference do...

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Technical Market Support

Mine Site Greenhouse Gas Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C23052Novel Stone Dust Looping Process For Ventilation Air Methane Abatement

This multi‐phase project is concerned with the mitigation of m...

C27054Optimisation Of A Thermal Flow Reversal Reactor For Ventilation Air Methane Mitigation

Ventilation air methane (VAM) generally accounts for 50-85% of the t...

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...

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