Dispersed ore gold characterisation

Amdur, A. M.; Pavlov, V. V.; Fedorov, S. A.; Matushkina, A. N.

doi:10.1080/00084433.2020.1780558

Cited by 2 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such impurities are characteristic of this alloy [18]. The platinum content decreases, as in the case of dispersed Au particles, which was established earlier [19], with a decrease in the thickness of the PtFe formations, Fig. 2.…”

Section: Resultssupporting

confidence: 64%

Behavior of platinum in the system of the matte-slag in the processing of copper-nickel materials

Amdur

Selivanov

Fedorov

et al. 2021

J min metall B Metall

View full text Add to dashboard Cite

Copper-nickel sulfide ores are one of the main sources of platinum. One of the ways to extract precious metals from such ores involves melting of a concentrate in electric ore smelting furnaces, where the melt is divided into matte and slag. Platinum is generally concentrated in matte; however, some its part remains in the slag, thus leading to metal losses. In order to reduce platinum losses, the forms of platinum in these phases should be studied. It was found that during the melting of this ore, iron, nickel, and copper are reduced. The mineral composition of matte has been studied. Platinum in matte is present in the form of intermetallics with Fe and Ni. The PtFe intermetallic is a dispersed needle formation with a length of 20 to 500 ?m and a thickness of up to 10 ?m. The size effect is revealed: the content of platinum in the PtFe intermetallic decreases with decreasing the thickness of needle formations. The decreases in the content of platinum in dispersed needle formations can be explained by an increase in the thermodynamic activity and changing properties of the dispersed substance and a corresponding increase in solubility. It was found that matte drops, together with their associated platinum-containing particles of no more than 5-7 ?m in size, were carried into the slag by gas bubbles using flotation. The conditions for the rise of a matte drop, together with a bubble in the slag, consist in the fact that the adhesive force of the drop with the bubble and the buoyancy force acting on the bubble must be greater than the gravity of the drop.

show abstract

Section: Resultssupporting

confidence: 64%

Behavior of platinum in the system of the matte-slag in the processing of copper-nickel materials

Amdur

Selivanov

Fedorov

et al. 2021

J min metall B Metall

View full text Add to dashboard Cite

show abstract

“…It has an irregular shape and a maximum size of 2 μm. Earlier, we found [13] that the amount of metallic impurities in dispersed particles of ore gold (in particular, in goldbearing copper-pyrite ore, Table 1) increases with decreasing their size (with a particle size less than 3 μm). In our opinion, the size effect is associated with the amorphization of particles smaller than 3 μm, a sharp change in the structure and properties in comparison with the bulk material and, as a consequence, an increase in the solubility of metals in gold due to an increase in the Gibbs energy.…”

Section: The Form Of Finding Of Gold and Platinum In The Melting Products Of Sulfide Materialsmentioning

confidence: 87%

Transfer of Gold, Platinum and Non-Ferrous Metals from Matte to Slag by Flotation

Amdur

Fedorov

Yurak

2021

Metals

View full text Add to dashboard Cite

One of the stages of extracting gold and platinum from sulfide materials and circulating slags is the melting stage in ore-thermal and electric furnaces, where the melt is separated into matte and slag. Gold, platinum, and non-ferrous metals are concentrated in the matte. However, a significant portion of them ends up in the slag, which reduces recovery and increases environmental pollution. The main reason for their transition to slag is the flotation of sulfide droplets by gas bubbles, a significant proportion of which occurs during the decomposition of sulfides. Gold and platinum are associated with matte droplets during flotation. Evaluation of adhesion showed that it is large and comparable to the cohesion of these metals. One of the options to reduce the loss of valuable components is to add fluxes to the slag. The influence of calcite and fluorite on the distribution of gold and platinum over the melting products of copper–nickel sulfide materials (matte and slag) has been experimentally studied based on the above theoretical concepts of droplet flotation. When calcite was added to sulfide ore, there was a significant decrease in the sulfur content in the slag (more than 3 times). This, in turn, led to a decrease in non-ferrous metals in the slag by 2–3 times, with gold from 0.45 to 0.29 g/t and platinum from 2.15 to 2.06 g/t. The addition of fluorite to the mixture of copper–nickel matte and model slag (CaO/SiO2/Al2O3 = 40/40/20) significantly reduced the sulfur content and non-ferrous metals by 1.5 times, whereas gold was not found in the slag. The decrease in the number of sulfides in the slag is mainly because the listed additives reduce its viscosity. This leads to acceleration of the coagulation of sulfide drops, which are inevitably carried into the slag during flotation, and increases the rate of their settling to the slag–matte boundary, where they merge with the matte mass.

show abstract

Dispersed ore gold characterisation

Cited by 2 publications

References 5 publications

Behavior of platinum in the system of the matte-slag in the processing of copper-nickel materials

Behavior of platinum in the system of the matte-slag in the processing of copper-nickel materials

Transfer of Gold, Platinum and Non-Ferrous Metals from Matte to Slag by Flotation

Contact Info

Product

Resources

About