Settling characteristics of ultrafine iron ore slimes |
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Authors: | Chinthapudi Eswaraiah Surendra Kumar Biswal Barada Kanta Mishra |
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Institution: | 1.Institute of Minerals and Materials Technology (IMMT),Council of Scientific and Industrial Research (CSIR),Bhubaneswar,India |
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Abstract: | The slurry settling characteristics are the most important to design a thickener in process industries. In this work, the
iron ore slurry from the screw classifier overflow was used for the settling study. It was observed that the original slurry
exhibited a low settling velocity and a turbid supernatant during the settling process. Commercial flocculating agents with
anionic, cationic, and nonionic characters were used to improve the settling behavior of suspensions, which were added into
the slurry at different ranges of slurry pH values, respectively. The settling results show that the use of flocculants increase
the settling rate by several times. Compared with the cationic and nonionic flocculants, the anionic flocculant is more effective
in enhancing the slurry settling rate. The small dose of the anionic flocculant is found to be more effective, but the other
flocculants are less effective even at higher dosages. The simulation of an industrial thickener was carried out based on
the laboratory settling data, and the appropriate design and selection parameters of the industrial thickener were estimated. |
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Keywords: | |
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