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Effects of Ca2+ and SO4 2- ions on fluorite flotation

Xun Luobing, Hu Jiacheng, Shi Qing, Zhang Guofan

Physicochemical Problems of Mineral Processing

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2021

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Vol. 57, iss. 2

95--104

EN

The effects of Ca2+ and SO4 2- on the flotation behaviour of fluorite with sodium oleate as a collector and the underlying mechanism by which these effects were investigated via micro-flotation experiments, solution chemistry calculations, and X-ray photoelectron spectroscopy. The results indicated that the addition of SO4 2- and Ca2+ inhibited fluorite flotation and the inhibition effect was increased by the addition of pH. This was mainly due to the increase of the sulphate-containing components in the solution and the adsorption of SO4 2- on the surface of fluorite. With the increase of pH, the alkalinity of the solution increases, OH- and more SO4 2- are further adsorbed on the fluorite surface, thereby reducing the recovery of fluorite flotation.

2

Effect of depressants in the selective flotation of smithsonite and calcite using cationic collector

Liu Hongjiang, Zhang Guofan, Luo Yuanjia

Physicochemical Problems of Mineral Processing

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2020

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Vol. 56, iss. 1

1--10

EN

This work studied the effects of sodium hexametaphosphate (SHMP), tanning extract, water glass (WG) and calcium lignosulfonate (CLS) as depressants for the separation of smithsonite from calcite by using a cationic collector called octadecylamine acetate (ODA). Micro-flotation experimental tests showed that CLS can greatly and selectively depress calcite. When the dosages of CLS used were 20 and 40 mg/L, a concentrate with Zn grades of 42.54% and 49.32% and Zn recoveries of 81.66% and 68.00% was achieved in the flotation separation of mixed mineral (1:1 smithsonite:calcite). Zeta potential and adsorption measurements revealed that the adsorption of CLS on calcite’s surface was greater than that on smithsonite’s surface. When CLS was added, the adsorption of ODA was hindered greatly on the calcite’s surface but slightly on the smithsonite’s surface.

3

Effect of iodine value of sodium fatty acids on flotation of collophanite

Liu Runzhe, Zhang Guofan, Zhang Hui, Liu Lifen, He Lin, Chen Yanfei

Physicochemical Problems of Mineral Processing

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2019

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Vol. 55, iss. 3

770--778

EN

The sodium fatty acids were firstly prepared by fatty acids with different iodine values which were from surfactant extraction using soybean oil fatty acid as raw material in this study. Effects of iodine value of sodium fatty acids on the flotation of collophanite were then investigated by flotation tests, contact angle measurements, adsorption tests, Krafft point measurements, foaming ability tests, and the resistance to the hard water measurements. Results show that the final flotation recovery was directly proportional to the iodine value of sodium fatty acid. Sodium fatty acid with higher iodine value has higher solubility and dispersity in the solutions, and stronger foaming ability and resistance to hard water. After interacting with collophanite, sodium fatty acid with higher iodine value made the mineral more hydrophobic, thus contributing to better flotation performances.