Role of Mixing Energy in the Flocculation of Mature Fine Tailings
| Autor: | Randy J. Mikula, Alebachew Demoz |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Flocculation
Environmental Engineering Materials science Shear thinning Mixing (process engineering) Fraction (chemistry) Dewatering Tailings Rushton turbine Chemical engineering Environmental Chemistry Geotechnical engineering Water treatment General Environmental Science Civil and Structural Engineering |
| Zdroj: | Journal of Environmental Engineering. 138:129-136 |
| ISSN: | 1943-7870 0733-9372 |
| Popis: | High-molecular-weight polymer flocculants are used for accelerated dewatering of mature fine tailings (MFTs) to reclaim the land occupied by containment ponds. Two anionic polymers were used to flocculate an MFT sample containing 98% by weight of fines smaller than 44 μm in diameter, with 85% of this fraction being clay minerals. The polymer solutions and polymer-treated MFT followed the Herschel-Bulkley and Bingham equations of state, respectively. The coupling of shear thinning and structural breakdown of the flocculated MFT gave rise to cavern formation during mixing. The mixing energy input for a series of MFT flocculation tests, in which other conditions were held constant, was proportional to the mixing time. The mixing tools used for the flocculation process were a Rushton turbine (RT), a pitched-blade turbine (PBT), a vane, and hydrofoil impellers. The flocculation outcome was evaluated on the basis of the amount of water released and the capillary suction test time (CST). The CST of the treated M... |
| Databáze: | OpenAIRE |
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