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Parameter effects on wet ultrafine grinding of limestone through slurry rheology in a stirred media mill
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
2006 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 161, no 1, p. 10-21Article in journal (Refereed) Published
Abstract [en]

Wet ultra-fine grinding of a limestone powder ( less than or equal 100 μm) has been investigated in a stirred media mill with respect to the effect of slurry rheology. The grinding results obtained by various parameters (i.e., molecular weight of a dispersant, solids concentration, additive dosage, addition method and beads load) are evaluated in terms of energy efficiency and the fineness of a product. A polymeric dispersant called Dispersant S40 with a molecular weight of 5500 gives the best grinding results. For a certain level of beads load, an optimal solids concentration exists. In the case of the additive dosage of Dispersant S40 at 0.1 wt.% or more, a smaller additive amount of Dispersant S40 gives a higher energy efficiency and a smaller median size at a lower level of specific energy input. However, the excessive amount of the dispersant could cause a cushion layer formed on milling beads and thus lowers stress intensities from the collisions of milling beads, leading to an inefficient milling operation. This can be avoided by either the multi-point addition of the dispersant or a higher beads load ( greater than or equal 83 vol.%). In addition, it was found that the higher the beads load, the better the cumulative energy efficiency, and the smaller the product size at the same specific energy consumption. For a given solids concentration, the relationships between the specific surface area and the particle size of an FP product and the additive amount of Dispersant S40 are explored, respectively. Furthermore, an empirical particle size-energy model provides a good fit (R2 > 0.991) to the grinding results under the experimental conditions investigated.

Place, publisher, year, edition, pages
2006. Vol. 161, no 1, p. 10-21
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-9739DOI: 10.1016/j.powtec.2005.08.026ISI: 000234880500002Scopus ID: 2-s2.0-30144442528Local ID: 86772d50-c357-11db-9ea3-000ea68e967bOAI: oai:DiVA.org:ltu-9739DiVA, id: diva2:982677
Note
Validerad; 2006; 20070111 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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He, MingzhaoWang, YanminForssberg, Eric

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