Differential adsorption of hydrolytic polymaleic anhydride as an eco-friendly depressant for the selective flotation of apatite from dolomite

Sodium tripolyphosphate as a selective depressant for separating magnesite from dolomite and its depression mechanism

In this study, we employed diammonium hydrogen phosphate (DHP) to regulate the flotation separation of brucite and calcite. Further, we investigated the activation and inhibition effects of DHP on calcite flotation and brucite flotation, respectively. The flotation test demonstrated that DHP enhances and reduces the floatability of calcite and brucite, respectively, resulting in a recovery difference of 77.54% with respect to the flotation separation of the two minerals. Contact angle measurements provided further evidence of the impact of DHP; it increases the contact angle and improves the floatability of calcite while decreasing the contact angle and reducing the floatability of brucite. Zeta potential analysis indicated that DHP can substantially reduce the adsorption of dodecylamine (DDA) on the surface of brucite but has little effect on the adsorption of DDA on the surface of calcite. Infrared analysis revealed that the adsorption of DHP on the surface of calcite benefits the collection of calcite using DDA, while its adsorption on the surface of brucite can hinder the collection of brucite by DDA. The X-ray photoelectron spectroscopy test demonstrated that DHP has a stronger affinity for the calcite surface than the brucite surface, and its adsorption effect on the calcite surface is more intensity. 

Activation–inhibition mechanism of diammonium hydrogen phosphate in flotation separation of brucite and calcite

The selective adsorption of xanthan gum on dolomite and its implication in the flotation separation of dolomite from apatite

Chlorite, as the most representative gangue mineral associated with specularite, of which the separation of these two minerals is difficult. This paper investigated the depression effect of taurine on specularite/chlorite separation via flotation experiments, adsorption tests, contact angle measurements, Zeta potential detection, FT-IR measurements, and XPS analyses. The results of single mineral flotation indicated that chlorite could be depressed selectively by taurine with the recovery of less than 30%, but the floatability of specularite remains high with recovery rate of 81.77% at pH 10. The artificial mixed mineral flotation results confirmed the effectiveness of taurine as a depressant. Surface adsorption, contact angle, and Zeta potential detection revealed taurine primarily adsorbs on the chlorite surface, which hampered the DDA’s subsequent adsorption and results in the chlorite’s poor floatability. The FT-IR spectra and XPS analyses provided further proof that taurine adsorbed on chlorite surface as an electron donor, and part of the electrons transferred from the sulfonic acid group of taurine to metal ions during the adsorption process. In addition, the hydrogen bond between amino-group of taurine and O ions in chlorite surface was also formed in the adsorption process. Finally, optimized adsorption configurations of taurine on chlorite surfaces were proposed. 

Selective depression action of taurine in flotation separation of specularite and chlorite

Selective adsorption of a new depressant Na2ATP on dolomite: Implications for effective separation of magnesite from dolomite via froth flotation

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Selective adsorption of a new depressant Na2ATP on dolomite: Implications for effective separation of magnesite from dolomite via froth flotation