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Effect of compound phosphate collector on flotation separation of jamesonite from marmatite and insights into adsorption mechanism

Huang Weiqin, Gu Guohua, Chen Xiong, Wang Yanhong

Physicochemical Problems of Mineral Processing

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2021

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Vol. 57, iss. 1

294--304

EN

Separating jamesonite and marmatite is difficult due to their similar response to traditional collectors. To improve the selectivity of the collector and simplify the reagent system, compound phosphate (MP) as a collector for the separation of jamesonite from marmatite was studied in this study. The flotation tests revealed that, compared with the most used butyl xanthate (BX), MP had the advantages of lower dosage and stronger selectivity under weak acid pulp. Under the optimum flotation conditions, a concentrate with the grade of 31.54% Pb, 6.93% Zn and the recovery of 89.87% Pb, 12.31% Zn could be obtained from mixed binary minerals flotation (mass ratio of 1:1). Adsorption, zeta potential, FT-IR and XPS analysis demonstrated that MP performed strong chemisorption on jamesonite surface while underwent weak physisorption on marmatite, this difference was responsible for the excellent selectivity of MP toward jamesonite flotation and weak collecting capacity to marmatite.

2

The flotation separation of barite-calcite using sodium silicate as depressant in the presence of sodium dodecyl sulfate

Chen Xiong, Gu Guohua, Liu Donghui, Zhu Renfeng

Physicochemical Problems of Mineral Processing

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2019

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Vol. 55, iss. 2

346--355

EN

The flotation separation of barite from calcite using sodium dodecyl sulfate (SDS) as the collector and sodium silicate (SS) as the depressant has been concretely studied in this paper. The results show that SDS has high collecting ability for both barite and calcite and that the flotation separation of barite from calcite cannot be achieved by using SDS alone. The depressant sodium silicate has a selective depression effect on calcite by the control of the pulp pH at 9.0 in the presence of SDS. Through locked cycle tests, a concentrate containing 95.54% BaSO4 can be obtained from an actual ore containing 24.5% BaSO4, with a recovery of 86.11%. The zeta potential measurements, adsorption analysis and infrared spectrum studies reveal that the pre-adsorption of sodium silicate strongly favors the adsorption of SDS on the calcite surface and adversely affects SDS adsorption on the barite surface. This property is the reason for the selective depression of SS on calcite.

3

Selective separation of chalcopyrite from jamesonite with guar gum

Chen Xiong, Gu Guohua, Zhu Renfeng, Wang Chongqing

Physicochemical Problems of Mineral Processing

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2019

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Vol. 55, iss. 1

237--247

EN

A novel reagent, guar gum (GG), is investigated as the depressant on the depression of chalcopyrite and jamesonite, when mixed aerofloat (CSU11) is used as the collector in flotation tests. Kinetics, dynamic potential, adsorption and infrared spectra analysis are performed to study the interaction mechanism between GG and minerals. The flotation results display that selective flotation separation of chalcopyrite from jamesonite is achieved under conditions of depressant GG 2.5 mg/dm3, collector CSU11 10 mg/dm3 and frother MIBC (Methyl isobutyl carbinol) 10 mg/dm3 at pH 5.3. As to mixed minerals flotation, the Cu grade and recovery in the concentrate is 21.35 % and 85.12 %, respectively, indicating that GG has a selective depression effect on jamesonite. Flotation kinetics shows that the addition of GG can dramatically reduce the floatability of jamesonite but hardly influences that of chalcopyrite. The zeta potential and adsorption reveal that the depressant GG adsorbs strongly on the surface of jamesonite. Infrared spectra reveal a dominant chemisorption between GG and jamesonite, while GG occurs weak chemisorption on chalcopyrite surface. This is the reason why GG has excellent selectivity for jamesonite and less effect on chalcopyrite.

4

Effect of food-grade guar gum on flotation separation of chalcopyrite and monoclinic pyrrhotite in low-alkali systems

Chen Xiong, Gu Guohua, Li Lijuan, Chen Zhixiang

Physicochemical Problems of Mineral Processing

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2019

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Vol. 55, iss. 2

437--447

EN

The flotation separation of chalcopyrite from monoclinic pyrrhotite using food-grade guar gum (FGG) as a depressant was studied through micro flotation and flotation kinetics experiments, zeta potential, adsorption measurements and scanning electron microscope (SEM) analysis as well as infrared spectroscopy analysis. The flotation tests showed that the reagent scheme of depressant FGG 40 mg/dm3, collector PAX (potassium amyl xanthate) 10 mg/dm3 and frother MIBC (Methyl isobutyl carbinol) 10 mg/dm3 at pH 8.0 could achieve selective flotation separation of chalcopyrite from monoclinic pyrrhotite (a concentrate with Cu grade of 22.35% and recovery of 82.52% was achieved from the mixed minerals flotation), which indicated that FGG exhibited a selective depression effect on monoclinic pyrrhotite The kinetics, zeta potential, adsorption, SEM and infrared studies revealed that the depressant FGG could absorb more strongly on the surface of monoclinic pyrrhotite than chalcopyrite. Additionally, the results revealed that the interaction of FGG with the monoclinic pyrrhotite surface was governed primarily by strong chemisorption, whereas FGG mainly bonded to chalcopyrite through hydrogen bonding bonding. This property was the reason why FGG had excellent depression selectivity toward monoclinic pyrrhotite and weak depression effect on chalcopyrite flotation.