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A New Experimental Approach to Evaluate Coal Particles Floatability: Bubble-Particle Attachment and Detachment
Lijuan Sun1, Yaowen Xing2, Haichang Yang1
1School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.
ACS Omega
|July 21, 2020
Summary
A new method using bubble-particle attachment kinetics (BPAK) effectively evaluates coal floatability. The modified attachment rate constant (k*) from BPAK accurately predicts flotation performance, outperforming other methods.
Area of Science:
- Mineral Processing
- Chemical Engineering
- Materials Science
Background:
- Accurate coal floatability evaluation is crucial for predicting flotation outcomes and designing efficient flotation circuits.
- Traditional methods may not fully capture the complex kinetics governing particle behavior during flotation.
Purpose of the Study:
- To introduce and validate a novel experimental approach for assessing coal particle floatability using bubble-particle attachment and detachment kinetics (BPAK and BPDK).
- To establish a reliable and quantitative method for predicting coal flotation performance.
Main Methods:
- Measured coating angles during bubble-particle attachment and detachment for different coal densities, fitting data to a first-order model.
- Determined modified attachment rate constant (k_a*) and detachment rate constant (k_d*) as floatability indicators.
- Compared BPAK/BPDK results with conventional flotation kinetics, induction time, and contact angle measurements.
Main Results:
- A consistent floatability sequence was observed: -1.4 > 1.4-1.6 > +1.6 g/cm³.
- A strong linear correlation was found between the modified flotation rate constant (k*) and the modified attachment rate constant (k_a*).
- k_a* proved to be a superior predictor of k* compared to k_d*, induction time, or contact angle measurements.
Conclusions:
- Bubble-particle attachment kinetics (BPAK) offers an effective and quantitative method for evaluating coal floatability.
- The modified attachment rate constant (k_a*) derived from BPAK is a robust yardstick for predicting flotation performance.
- This new approach provides a more accurate assessment for flotation process design and optimization.
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