Influence of Particle Size in Talc Suppression by a Galactomannan Depressant
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Abstract:
Flotation behavior of different sizes of particles may follow different trends. The influence of particle size in talc suppression by a depressant galactomannan was studied in this research. The flotation response and mechanism were examined by flotation tests, modified flotation rate constant and entrainment recovery calculation, laser particle size experiments, adsorption tests, and advancing contact angle measurement as well as scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). The maximum recovery increased with particle size increases in the absence of galactomannan FPY (Fenugreek polysaccharide). The obviously suppressed effect was observed for the size fraction of −74 + 38 μm after reacting with FPY, but low efficiency was received for −38 μm and −10 μm, respectively. Laser particle size analysis indicated that the FPY has a certain function for the flocculation of fine particles. It is beneficial for reducing recovery by entrainment. EDS and advancing contact angle test results showed that the difference in contact angles probably is a result of genuine differences in the quantity of O and Mg bearing surface species, while the contact angle varied with particle size fraction in the absence of FPY. Adsorption and SEM test results demonstrated that in the case of −74 + 38 μm, the depressant adsorption density on the mineral surface is higher than the other two size fractions. On the whole, FPY probably is not enough of a depressant for talc suppression.Keywords:
Depressant
Talc
Particle (ecology)
Talc
Depressant
Beneficiation
Froth flotation
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Talc
Depressant
Zeta potential
Carrageenan
Froth flotation
Beneficiation
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Mineral chemistry of talc from the Dongyang talc deposits was studied to characterize the differences between dolomite-origin talc (talc I) and tremolite-origin talc (talc II). Average iron and aluminum contents are higher in talc II, 2.18 wt% FeO and 0.31 wt% O), than in talc I, 1.48 wt% FeO and 0.08 wt% O). Consistently lower Mg/(Mg+Fe+Mn) ratios and higher AI concentrations with uniform values of talc II compared to talc I seem to reflect the compositional differences of the original materials, tremolite and dolomite, respectively. Relative enrichment of Al as well as Fe in talc II compared to tremolite can be attributed to their immobile behaviors during alteration process and the rapid diffusion of hydrothermal fluids, which can accelerate instantaneous nucleation with immaturity growth of talc II. Increase in the concentrations of talc II can lower the ore grade by increasing concentrations of impure components such as AI and Fe, and by abundant presence of tremolite as well.
Talc
Tremolite
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ABSTRACT This paper is an attempt to explain the firing behavior of pure talc as well as talc‐clay, talc‐lime, talc‐clay lime, and some other high magnesia mixtures. Phase rule equilibrium diagrams are used. The study applies only to those mixtures where talc is present in amounts greater than 50% of the total composition.
Talc
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The experimental sample consists of talc, magnesite and a little quartz, the grade of talc is 80%. By the floatation flowsheet of rougher and two times cleaner, and middling after regrinding return to rougher, the high grade talc concentrate can be obtained. The concentrate contains talc 95.67% (SiO 2 61.68%). Talc recovery rate is 89.43%. By this way, the output of high class talc product is increased and talc resources are exploited very well.
Talc
Magnesite
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Talc
Depressant
Zeta potential
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Investigations have been carried out on the possibilities to improve talc quality by using flotation and determination of the optimum values of operating variables such as depressant dosage, frother dosage and solid concentration. Studies were focused to obtain good quality talc from mineral ore samples. Pine oil was used as frother and sodium hexametaphosphate was chosen as depressant. Optimum quantities of frother, depressant and feed concentrations were arrived at initially. Both continuous and batch column flotation studies were conducted. The actual ore contained 45 to 50 percent of talc. Recovery was good with the final product consisting about 90 percent of talc.
Talc
Beneficiation
Depressant
Sodium hexametaphosphate
Froth flotation
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The flotation separation of chalcopyrite from talc is difficult due to their good natural floatability. To solve this problem, the effect of gum Arabic (GA) on the flotation separation of chalcopyrite from talc was systematically investigated and its selective depression mechanism was discussed. Single mineral flotation test results showed the addition of GA could effectively depress the flotation of talc across the whole pH tested, while had a negligible effect on chalcopyrite in the pH range of 6–8. The mixed minerals flotation tests demonstrated that the effective separation of chalcopyrite from talc could be achieved with a concentrate of 31.36% Cu grade at 87.15% Cu recovery in the presence of GA. This was attributed to the greater adsorption density of GA on talc surface than that on chalcopyrite surface. In addition, compared to the concentrate (Cu grade: 27.01%, Cu recovery: 87.03%) with guar gum as the depressant, an increase of 4.35% of Gu grade was obtained with the use of GA. The results of X-ray photoelectron spectroscopy (XPS) measurements and zeta potential tests indicated that GA adsorbed on talc surface mainly via hydrophobic interaction and hydrogen bond may also play a role.
Talc
Depressant
Froth flotation
Zeta potential
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Talc
Pullulan
Depressant
Zeta potential
Beneficiation
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