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Flotation separation of dolomite and apatite using polyaspartic acid as inhibitor

Kang Yuntao, Zhang Qin

Physicochemical Problems of Mineral Processing

2021

Vol. 57, iss. 6

113--126

In this paper, polyaspartic acid (PASP) was exploited as a novel dolomite depressant for flotation separation of apatite and dolomite. A series of tests with Zeta potential, FTIR and XPS were used to reveal the inhibitory mechanism of PASP on dolomite. The microflotation test illustrated that PASP has a strong inhibitory impact on dolomite, and little effect on the floatability of apatite in the pH range of 9-11. When using 2.7 Mg/L PASP as the depressant under sodium oleate (NaOl) system, the flotation recovery of dolomite dropped dramatically to 9.95%, and the recovery of apatite remained at about 88.27% at pH 10. Both dolomite and apatite have calcium ion on the surface. The calcium ion on the surface of apatite were strongly inhibited and repelled by the localized anions, while the important role on the surface of dolomite was positively charged magnesium ion and localized calcium species. PASP could ionize carboxylate ion under alkaline conditions, which could chemically chelate with the exposed metal ion and be adsorbed on the surface of dolomite. And then prevent the further adsorption of NaOl onto dolomite, which greatly weaken the floatability of dolomite and enhanced the flotation separation of the two minerals.

Use of PASP and ZnSO4 mixture as depressant in the flotation separation of chalcopyrite from Cu-activated marmatite

Wei Qian, Jiao Fen, Qin Wenqing, Dong Liuyang, Feng Liqin

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 5

1192--1208

In this study, the synergistic depressive effect of polyaspartic acid (PASP) and zinc sulfate (ZnSO4) in the flotation separation of chalcopyrite from Cu-activated marmatite was investigated by micro-flotation experiments and ore sample flotation tests, and the possible depressive mechanism was proposed from contact angle measurements, fourier transform infrared (FT-IR) analysis, inductively coupled plasma (ICP) measurements and X-ray photoelectron spectroscopy (XPS) analysis. Microflotation tests indicated that the mixed depressant PASP/ZnSO4 (PZ) exerted strong depressive effect on Cu-activated marmatite in the pH range of 9~12, but it had little effect on chalcopyrite flotation. The ore sample flotation experiments indicated the PZ system decreased the grade of Zn in Cu concentrate by 4.18%, and the depressant consumption was reduced by more than a half. The results from contact angle measurement demonstrated that the hydrophobicity of Cu activated-marmatite surface was higher than that of chalcopyrite surface in presence of PZ. FT-IR analysis demonstrated the more intensive chemisorption of PZ on Cu-activated marmatite surface. ICP measurements showed that PASP had an excellent complexing ability with Cu2+ and Zn2+, which not only reduced the activation of Cu species, but also generated Zn-PASP complex on marmatite surface. XPS analysis indicated a stronger interaction between PZ and Cu-activated marmatite surface, and the depressant PZ may mainly react with Cu-activated marmatite surface through the copper atoms.