Analysis of Dust Formation in the Oxygen Flash Smelting of Lead-Bearing Feeds in the Kivcet Smelter

AbstractThere are only a few smelters processing copper concentrates directly into blister copper. Despite the many advantages of this process, a serious challenge of this technology is the need to process the resulting flash smelting slag. It contains 12–15% copper and 2.5–4% lead. In this form, it cannot be considered as waste material and, therefore, a high-temperature reduction process is carried out. This decopperization process is energy- and time-consuming. The use of mineralurgical and hydrometallurgical processes, selective enrichment of the appropriate slag fractions in copper and lead, followed by its hydrometallurgical processing and recovery of Cu and Pb could be an interesting supplement to the methods used so far. The article presents results of research on the possibility of separation of useful components from copper slag using the original method of sieve analysis, gravitational enrichment and magnetic separation. Preliminary results of tests were made on a laboratory scale. Then, selective leaching of copper and lead from flash smelting slag was carried out, obtaining very promising results.

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Optical/infrared observations of RV Tauri stars

Symposium - International Astronomical Union ◽

10.1017/s0074180900157262 ◽

1987 ◽

Vol 122 ◽

pp. 537-540

Author(s):

M. J. Goldsmith ◽

A. Evans ◽

J. S. Albinson ◽

M. F. Bode

Keyword(s):

Dust Formation ◽

Infrared Excess ◽

Infrared Observations ◽

Dust Shells ◽

Discernible Difference

Optical/infrared observations of RV Tauri stars obtained at SAAO have allowed the natures of the dust shells around stars with infrared excess to be investigated. The data suggest that dust formation occurs sporadically and that some stars have multiple shells. There is no photometrically discernible difference between carbon- and oxygen-rich stars or their dust shells. There is some evidence that stars with higher metallicity have more dust.

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Zooming into the complex dusty envelopes of C-rich AGB stars

Proceedings of the International Astronomical Union ◽

10.1017/s1743921318006300 ◽

2018 ◽

Vol 14 (S343) ◽

pp. 456-457

Author(s):

Foteini Lykou ◽

Josef Hron ◽

Daniela Klotz

Keyword(s):

Temperature Distribution ◽

Near Infrared ◽

Angular Resolution ◽

High Angular Resolution ◽

Dust Formation ◽

Agb Stars ◽

Circumstellar Envelopes ◽

Recent Advances ◽

Multi Wavelength

AbstractRecent advances in high-angular resolution instruments (VLT and VLTI, ALMA) have enabled us to delve deep into the circumstellar envelopes of AGB stars from the optical to the sub-mm wavelengths, thus allowing us to study in detail the gas and dust formation zones (e.g., their geometry, chemistry and kinematics). This work focuses on four (4) C-rich AGB stars observed with a high-angular resolution technique in the near-infrared: a multi-wavelength tomographic study of the dusty layers of the circumstellar envelopes of these C-rich stars, i.e. the variations in the morphology and temperature distribution.

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