Effect of Carboxymethyl Chitosan on the Depression Performance of Quartz/K-Feldspar Flotation under Weakly Alkaline Condition
Quartz and K-feldspar are co-associated silicate minerals characterized by similar properties.In order to miti-gate the environmental impact of acid leaching effluents associated with quartz flotation and the large amount of bubbles by the conventional collector dodecylamine not conducive to flotation,the depression effect of carboxymethyl chitosan on flotation of quartz and K-feldspar in weak alkaline environment was investigated by pure mineral flotation under the novel diamine collector system.The main mechanism of adsorption was analyzed by Zeta potential test,Fourier Transform Infrared Spectroscopy(FT-IR)and X-ray photoelectron spectroscopy(XPS).Comparative analysis of the flotation performance of two diamine collectors revealed that 1,10-diamino-decane(DAM)outperforms 1,8-octamethylene diamine(0DM).Specifically,under conditions of pH of 9 and DAM dosage of 20 mg/L,the addition of 120 mg/L CMC effectively suppresses quartz flotation within the quartz/K-feldspar system,resulting in a recovery difference of up to about 52 percentage points,the results of artificial ore mixing also prove that carboxymethyl chitosan can effectively separate quartz and K-feldspar.Mechanism analysis results showed that the multistage amine groups produced by carboxymethyl chitosan surface hydrolysis are adsorbed on the quartz surface through hy-drogen bonding.This adsorption significantly enhances the hydrophilicity of the quartz surface,thereby facilitating the effective separation of quartz and K-feldspar in an acid-free environment.
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