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A real-time light-scattering technique for tailings solids measurement.

Manisha Gupta1, Tim Ho1, Tulika Srivastava1

  • 1Dep. of Electrical and Computer Engineering, Univ. of Alberta, Edmonton, AB, T6G 2R3, Canada.

Journal of Environmental Quality
|March 22, 2021
PubMed
Summary

A new economic in situ light-scattering sensor accurately measures solid content in tailings facilities in real-time. This technology offers effective tailings management by correlating scattered light intensity with solids concentration.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Engineering

Background:

  • Real-time monitoring of solid content in tailings facilities is crucial for effective management and environmental safety.
  • Traditional methods for measuring solids content can be time-consuming and may not provide continuous data.
  • Existing technologies may lack the economic viability for widespread implementation in tailings management.

Purpose of the Study:

  • To develop and validate an economical in situ light-scattering sensor for real-time measurement of solids content in tailings.
  • To establish the relationship between scattered light intensity and solids concentration using different materials.
  • To assess the sensor's performance against established measurement techniques in a large-scale settling column.

Main Methods:

  • Construction of an experimental setup utilizing a blue laser diode (405 nm) and silicon photodiodes to measure scattered light intensity at various angles.
  • Characterization of light scattering behavior for tailings and kaolin, identifying a cos^n(θ) relationship with n ≈ 1.5.
  • Development and testing of an insertion-based prototype in a 2.7 m settling column, comparing results with gravimetric and gamma-ray measurements.

Main Results:

  • Scattered light intensity increases with solids content, showing similar settling behavior for tailings and kaolin, albeit on different timescales.
  • An optimal scattering angle of θ = 20° was identified for sensor design due to a high signal-to-noise ratio.
  • The prototype sensor demonstrated good agreement with standard gravimetric and gamma-ray methods, indicating its potential for tailings management.

Conclusions:

  • The developed light-scattering sensor is a cost-effective and reliable tool for in situ, real-time monitoring of solids content in tailings facilities.
  • The sensor's ability to correlate light scattering with solids concentration provides valuable data for optimizing tailings management practices.
  • Further validation in the absence of optical fouling confirms the sensor's potential for practical application in the mining industry.