Design of a continuous pilot-scale deslime thickener
Thickening is used during two primary mineral processing operations: water removal and desliming. During water removal, the pulp density is increased through the injection of flocculants. These flocs settle and create a dense pulp while clarified water is removed through the overflow. During desliming, fine particles are removed through the overflow. Desliming can also be used as a mineral separation process known as selective flocculation-dispersion, where valuable minerals are flocculated and gangue minerals remain dispersed and exit through the overflow.
There are many ways to analyze thickener performance on a laboratory scale, but these analyses often do not correlate well with full-scale performance. Some pilot-scale systems have been designed using a semicontinuous approach, but the amount of material required to perform their tests can make semicontinuous pilot thickeners impractical for most applications. This paper focuses on the design and optimization of a continuous pilot-scale deslime thickener that requires minimal material to operate. The design, optimization strategy, and an example study of reagent selection are demonstrated.
Key wordsThickening Iron Ore Desliming Flocculation Design
Unable to display preview. Download preview PDF.
- ASTM International, 2011, “E1070-11 Standard Test Method for Determination of Phosphorus in Iron Ores by Phospho-Molybdenum-Blue Spectrophotometry,” Conshohocken, PA.Google Scholar
- Bolen, J., 2014, “Modern air pollution control for iron ore induration,” Minerals & Metallurgical Processing, Vol. 31, No. 2, pp. 103–114.Google Scholar
- Braun, C., 2013, Laboratory thickener design suggestions, personal communication, Aug. 13, 2013.Google Scholar
- Carlson, J.J., and Kawatra, S.K., 2008, “Effect of particle shape on the filtration rate in an industrial iron ore processing plant,” Minerals & Metallurgical Processing, Vol. 25, No. 3, pp. 165–168.Google Scholar
- Coe, H.S., and Clevenger, G.H., 1916, “Methods for determining the capacity of slime-settling tanks,” Transactions of the American Institute of Mining Engineers, AIME, New York, NY, Vol. 58, p. 102.Google Scholar
- Halt, J.A., 2014, “Increasing the preheat strength of cornstarch-bonded pellets,” Minerals & Metallurgical Processing, Vol. 31, No. 3, pp. 179.Google Scholar
- Halt, J.A., and Kawatra, S.K., 2014, “Review of organic binders for iron ore concentrate agglomeration,” Minerals & Metallurgical Processing, Vol. 31, No. 2, pp. 73–94.Google Scholar
- Haselhuhn, H.J., 2012, “Water chemistry effects on the zeta potential of concentrated hematite ore,” Minerals & Metallurgical Processing, Vol. 29, No. 2, pp. 135–136.Google Scholar
- Haselhuhn, H.J., 2013, “Dispersant adsorption and effects on settling behavior of iron ore,” Minerals & Metallurgical Processing, Vol. 30, No. 3, pp. 188–189.Google Scholar
- Haselhuhn, H.J., Carlson, J.J., and Kawatra, S.K., 2012, “Water chemistry analysis of an industrial selective flocculation dispersion hematite ore concentrator plant,” International Journal of Mineral Processing, Vol. 102–103, pp. 99–106, https://doi.org/10.1016/j.minpro.2011.10.002.CrossRefGoogle Scholar
- Haselhuhn, H.J., Swanson, K.P., and Kawatra, S.K., 2012b, “The effect of CO2 sparging on the flocculation and filtration rate of concentrated hematite slurries,” International Journal of Mineral Processing, Vol. 112–113, pp. 107–109, https://doi.org/10.1016/j.minpro.2012.04.006.CrossRefGoogle Scholar
- Laros, T., Slottee, S., and Baczek, F., 2002, “Testing, Sizing, and Specifying Sedimentation Equipment,” Mineral Processing Plant Design, Practice, and Control, A.L. Mular, D.N. Halbe and D.J. Barratt, eds., Society for Mining, Metallurgy & Exploration Inc., Englewood, CO, Vol. 2, pp. 1295–1312.Google Scholar
- Liu, S., Zhau, Y., Wang, W., and Wen, S., 2014, “Beneficiation of a low-grade, hematite-magnetite ore in China,” Minerals & Metallurgical Processing, Vol. 31, No. 2, pp. 136–142.Google Scholar
- Ma, X., 2011a, The Dispersion of Kaolinite, Iron Ore, The Australian Institute of Mining and Metallurgy, Perth, Australia.Google Scholar
- Manouchehri, H.R., 2014, “Pyrrhotite flotation and its selectivity against pentlandite in the beneficiation of nickeliferous ores: An electrochemistry perspective,” Minerals & Metallurgical Processing, Vol. 31, No. 2, pp. 115–125.Google Scholar
- Sandvik, K.L., and Larsen, E., 2014, “Iron ore flotation with environmentally friendly reagents,” Minerals & Metallurgical Processing, Vol. 31, No. 2, pp. 95–102.Google Scholar
- Semberg, P., Andersson, C., and Bjorkman, B., 2014, “Interaction between iron oxides and olivine in magnetite pellets during reduction at 500°–1,300°C,” Minerals & Metallurgical Processing, Vol. 31, No. 2, pp. 126–135.Google Scholar
- Siirak, J., and Hancock, B.A., 1988, “Progress in developing a flotation phosphorus reduction process at the tilden iron ore mine,” XVI International Mineral Processing Congress, Elsevier, Stockholm, Sweden, pp. 1393–1404.Google Scholar
- Stroop, R., 2013, Dispersant use suggestions, personal communication, Oct. 20, 2013.Google Scholar