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Fuzzy association rule-based set-point adaptive optimization and control for the flotation process

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Abstract

Froth flotation is a complicated process which is difficult to establish its first-principle model. Due to the fluctuations in the grade of raw ore, adaptively adjusting the set-points is extremely important in the flotation process. The inappropriate set-points easily lead to the instability of the process. This paper presents a fuzzy association rule-based set-point adaptive optimization and control strategy for the antimony flotation process without knowing the system model. Firstly, a fuzzy neural network is constructed as a soft-sensor to estimate the feed grade online because of the lack of efficient measurement equipment. Then, fuzzy association rule is used to mine the hidden relationship between the feed grade with reagent dosages and the optimal set-points. Through data mining from the quantitative database, the fuzzy inference system generates the optimal set-points. To implement satisfactory tracking performance, predictive controller is used to compute the control inputs. Because the system dynamics is unknown, long short-term memory network model is established to predict the future behaviors of the process. Finally, simulations and experiments are carried out to demonstrate the effectiveness of the proposed strategy. Compared to the manual manipulation, which is widely used in flotation processes, our control strategy achieves a better control performance, and the concentrate grades are more in line with the process requirement.

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Acknowledgements

This work was supported by the National Science Fund for Distinguished Young Scholars of China (Grant No. 61725306), the National Natural Science Foundation of China (Grant No. 61751312), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 61621062), and the Fundamental Research Funds for the Central Universities of Central South University (Grant Nos. 2018zzts168 and 2018zzts543).

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Authors and Affiliations

  1. School of Automation, Central South University, Changsha, 410083, Hunan, China

    Mingxi Ai, Yongfang Xie, Shiwen Xie, Jin Zhang & Weihua Gui

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  1. Mingxi Ai
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  2. Yongfang Xie
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  3. Shiwen Xie
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Correspondence to Shiwen Xie.

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Ai, M., Xie, Y., Xie, S. et al. Fuzzy association rule-based set-point adaptive optimization and control for the flotation process. Neural Comput & Applic 32, 14019–14029 (2020). https://doi.org/10.1007/s00521-020-04801-1

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