Faktori koji određuju stopu procesa isparavanja komponenata metalne kupke

This paper provides a discussion on the impact of selected factors on the rate of the process of evaporation of volatile metal bath components. The main determinants of the evaporation process are considered to be the pressure inside the metallurgical aggregate, type of the gaseous atmosphere, rate of the bath mixing as well as its composition.U referatu se raspravlja o utjecaju odabranih faktora na proces isparavanja hlapljivih komponenata metalne kupke. Glavni faktori koji određuju process isparavanja smatra se da su tlak unutar metalurškog agregata. vrsta plinovite atmosfere, stopa miješanja kupke, te njene komponente

Lead and zinc removal from alloy Zn-Ag-Pb under reduced pressure

The presented work shows the results of vacuum melting of industrial Zn-Ag-Pb alloy arising from the processing of silver-bearing foam. The tests were carried out in an induction vacuum aggregate in the temperature range 773 - 873 K and pressure 10 - 1 000 Pa. Based on the results obtained, the values of the density of the evaporating stream of zinc and lead were estimated, which were at the level from 3,95×10-4 to 9,53×10-4 gZncm-2 s-1 and from 5,39×10-5 to 30,9×10-5 gPbcm-2 s-1 . In addition, silver losses were estimated in the analysed process. The maximum degree of dezincification of the alloy achieved for the assumed temperature and pressure was 99 %

Lead and zinc removal from alloy Zn-Ag-Pb under reduced pressure

The presented work shows the results of vacuum melting of industrial Zn-Ag-Pb alloy arising from the processing of silver-bearing foam. The tests were carried out in an induction vacuum aggregate in the temperature range 773 - 873 K and pressure 10 - 1 000 Pa. Based on the results obtained, the values of the density of the evaporating stream of zinc and lead were estimated, which were at the level from 3,95×10-4 to 9,53×10-4 gZncm-2 s-1 and from 5,39×10-5 to 30,9×10-5 gPbcm-2 s-1 . In addition, silver losses were estimated in the analysed process. The maximum degree of dezincification of the alloy achieved for the assumed temperature and pressure was 99 %

The effects of mass transferin the liquid phase on the rate of aluminium evaporation from the Ti-6Al-7Nb alloy

In the present paper, the rate of aluminium evaporation from the Ti-6Al-7Nb alloy during smelting with the use of VIM method at 5 to 1 000 Pa and 1 973 to 2 023 K has been discussed. It has been observed that pressure reduction and temperature rise affect aluminium elimination from the alloy. Based on the determined values of overall mass transfer coefficients and mass transfer coefficients in the liquid phase, it has been found that the resistance related to aluminium mass transfer in the liquid phase is about 8 % of the overall process resistance

Research on the reduction of cooper slag using an alternative coal range

Blister copper smelting in a flash furnace results in the generation of slag with a Cu content greater than 15 percent. In the process of reduction in an electric furnace, coke or coke breeze is used as a carbon-bearing material. The presented work shows the results of studies on the reduction of the slag with a carbon flotoconcentrate as a substitute for coke breeze. The microstructure, chemical composition and phase composition of slag samples were analyzed. Based on the results of chemical composition of the Cu-Pb-Fe alloy and the post-reduction slag, it was shown that carbon flotoconcentrate might be considered as an alternative for currently used reducers

Application of fine-grained coke breeze fractions in the process of iron ore sintering

The testing cycle, described in the paper, included fine-grained coke breeze granulation tests and iron concentrate sintering tests with the use of selected granulate samples. The use of granulated coke breeze in the sintering process results in a higher process efficiency, shorter sintering duration and fuel saving

The obtained of concentrates containing precious metals for pyrometallurgical processing

In the presented study the flotation process has been proposed as a method of enrichment of silver-bearing jewellery waste. This method, traditionally used for the enrichment of non-ferrous metal ores, is based on differences in wettability between individual minerals. Flotation concentrate, enriched with Ag, was subjected to further processing by the pyrometallurgical method in order to produce silver from these wastes

The role of a gas phase in the evaporation process of volatile components of the metal bath

In the paper, the role of the gas phase in the process of evaporation of metal bath volatile components, considering mass transfer, is presented

A study on the process of fine-grained plumbiferous material agglomeration

In the paper, results of a study on the agglomeration process of fine-grained plumbiferous materials, belonging to basic resources for lead recovery, are presented. For the agglomeration tests, a laboratory drum granulator and a balling disc were utilized. The obtained granules were tested for compression strength with the use of a so-called Michaelis testing device as well as for drop strength, determined per the standards. The results allowed for evaluating the effects of the composition of the blend of materials subjected to agglomeration on the quality of obtained granules

Application of waste anthracite dust in the process of copper matte smelting

This study presents the results of research on the process of smelting of copper matte with the use of anthracite waste dust as fuel. A method of introducing this carbon-bearing waste into the technological process carried out in a shaft furnace in the form of an additive to briquettes with copper concentrate was developed. These briquettes were tested for the required strength properties