The flotation behavior of chalcopyrite in the presence of bentonite in salt water containing Na+ and K+

Gu, Guohua; Song, Siyu; Du, Shiya; Wang, Yanhong

doi:10.1016/j.mineng.2022.107767

Cited by 5 publications

(1 citation statement)

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“…The use of seawater for mineral flotation processes has significantly addressed the issue of freshwater scarcity, particularly in the development of deep-sea mineral resources, which can significantly reduce transport and extraction costs at the same time [13][14][15]. However, the presence of various ions in seawater is considered detrimental to mineral flotation under alkaline conditions, especially for Ca 2+ and Mg 2+ [16][17][18]. Castro et al found that the hydroxy complexes and the precipitates by Ca 2+ and Mg 2+ adsorbed on the molybdenite surface and then formed a hydrophilic coating that hinders the adsorption of a collector [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Acidified Sodium Silicate on the Flotation Separation of Microfine Apatite from Chlorite in Seawater

Liao

Wu²,

Xiong

et al. 2023

Minerals

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In this work, selective flotation separation of microfine apatite and chlorite was achieved by using sodium oleate (NaOL) as a collector with a low dosage of acidified sodium silicate (ASS) as a depressant. The optimum ratio of sodium silicate to sulfuric acid for ASS was 5:3, and a good separation effect was also achieved in the mixed ore system. Compared to the deionized water system, the ions of Na+, Ca2+ and Mg2+ in seawater adsorbed on the surfaces of apatite and chlorite, which made the zeta potential of the two minerals shift positively. This presented a challenge to the selection of reagents for mineral separation. The addition of ASS changed the pH value of the pulp from weak alkalinity caused by seawater to weak acidity, which allowed the metal ions adsorbed on the mineral surface to desorb. Meanwhile, ASS can selectively adsorb on the desorbed chlorite surface in the form of Si(OH)4, which hindered the action of NaOL, leading to the depression of chlorite. NaOL adsorbed well on the desorbed surface of apatite and increased the apatite particle size from 27 μm to 229 μm, with a hydrophobic agglomeration effect, thus enhancing the flotation of microfine apatite.

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