Research on Flotation Separation of Fine-grained Hematite/Quartz Based on Asynchronous Agglomeration Regulation
To address issues such as mechanical entrainment of fine mineral particles and low flotation efficiency in the flotation separation process of hematite and quartz,asynchronous flocculation was introduced.This involved selectively flocculating fine hematite and quartz particles in a staggered manner using starch and PEO to form appropriately sized hematite and quartz flocs.The behavior and mechanism of asynchronous flocculation flotation in the hematite and quartz system were investigated through flotation tests,sedimentation tests,scanning electron microscopy(SEM),and Zeta potential measurements.The results showed that asynchronous flocculation followed by flotation using dodecyl trimethyl ammonium bromide as a collector could enhance the separation efficiency of hematite and quartz.Specifically,selective flocculation of hematite and quartz was achieved by sequentially adding starch and PEO,with the best flotation performance observed at a PEO dosage of 40 g/t,resulting in hematite concentrate grades and recovery rates of 62.13％and 93.16％,respectively.PEO was found to flocculate quartz,promote the flotation of cationic collectors,increase quartz flotation recovery,reduce entrainment of quartz in hematite concentrates,and consequently improve the grade and recovery of hematite concentrates.
fine particlesquartzhematiteselective flocculationflotation separation
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