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2 Physicochemical Problems of Mineral Processing

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The effect of lizardite on talc flotation using carboxymethyl cellulose as a depressant

Deng Jie, Yang Siyuan, Zhang Wencai, Liu Cheng, Li Hongqiang

Physicochemical Problems of Mineral Processing

2020

Vol. 56, iss. 4

702--709

The effect of lizardite on talc flotation when using carboxymethyl cellulose (CMC) as a depressant was studied by micro-flotation experiments and adsorption measurements, zeta-potential measurements, magnesium ion dissolution analysis, and solution chemistry calculation. The results for the micro-flotation experiments showed that the addition of lizardite further decreased the floatability of talc at pH 8.5 when using CMC as the depressant. The mechanism was that magnesium ions dissolved from lizardite lattice, then formed hydrolyzed species of magnesium cations and interacted with talc surfaces, which promoted CMC adsorption, and thus decreasing talc floatability.

Utilization of N-carboxymethyl chitosan as a selective depressant for talc in flotation of chalcopyrite

Liu Cheng, Feng Qiming, Shi Qing, Zhang Wencai, Song Shaoxian

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 1

108--115

Flotation separation of chalcopyrite from talc is difficult because of the natural hydrophobicity of two minerals. In this work, the flotation separation of chalcopyrite from talc using N-carboxymethyl chitosan as a depressant for talc was studied. The micro-flotation results indicated that the flotation separation of chalcopyrite from talc cannot be realized effectively at pH 9 with low concentration of N-carboxymethyl chitosan, in the presence of calcium ions, talc was more efficiently depressed by N-carboxymethyl chitosan, while the chalcopyrite recovery was not influenced. Contact angle, zeta potential and adsorption results showed that Ca2+ and CaOH+ absorbed on the talc surface and increased the absorption amount of N-carboxymethyl chitosan on the mineral surface, and increased hydrophilicity of talc surface, resulting the selective depression for talc in chalcopyrite flotation.