Search

Copyright of Studia Archaeologica Brunensia is the property of Masaryk University, Faculty of Arts and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of the Archaeological Museum in Zagreb / Vjesnik Arheološkog Muzeja u Zagrebu is the property of Archaeological Museum in Zagreb and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bankarstvo Magazine is the property of Association of Serbian Banks and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper reports the effect of the components of a direct leaching residue (jarosite and elemental sulfur), on the recovery of valuable metals such as gold and silver. Leaching media such as cyanide and mixtures of cyanide with glycine were used to recover the gold and silver from the residue; however, a low recovery of these metals was obtained. This occurred due to the negative effect of its components which caused problems in the extraction process such as encapsulation of silver (due to jarosite) and the formation of thiocyanate and re-precipitation of silver (due to sulfur). Various treatments prior to leaching were tested, finding that when the residue was desulfurized with perchlorethylene and subjected to an oxidizing alkaline hydrothermal treatment, the gold extraction increased from 39.73 to 88% and the silver extraction of 64.76 to 94.29%. Additionally, it was determined that when cyanide was assisted by glycine, the latter decreased the cyanide consumption by inhibition of the dissolution of iron and sulfur in cyanide. [ABSTRACT FROM AUTHOR]

Copyright of Industry / Industrija is the property of Economics Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Fórum pro Konzervátory-Restaurátory is the property of Technical Museum in Brno and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Gold flotation concentrate may contain relatively high concentrations of valuable metals such as iron, copper, and zinc, and occasionally, even precious metals such as gold. The major components of the concentrate are SiO2, Fe2O3, and Al2O3, but it also contains reactive sulphide minerals such as pyrite. The sulphides in the flotation concentrate are fully converted into an oxide form during oxidative roasting, therefore, the chemical composition of the roasted concentrate is considered to be a copper slag. High temperature smelting with additives to dissolve Au from the gold concentrate into a molten copper was used in the research. Gold greatly dissolved at 1600°? under a CaO/SiO2 ratio of 1.25, suggesting the increase in the dissolution of gold into molten copper with decreasing viscosity of the molten slag-like concentrate at high temperatures. [ABSTRACT FROM AUTHOR]

Copyright of European Journal of Applied Economics is the property of Singidunum University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Constantine's Letters / Konštantínove Listy is the property of Institute for Research of Constantine & Methodius's Cultural Heritage and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In 2014 a flat cremation cemetery dating from the early phase of the Late Bronze Age was investigated near the village of Kukle near Tálín. A total of three definite, strongly damaged graves were registered. The discovery of fragments of an unspecified object made of gold sheet is very significant, because gold artefacts are rather rare in the Knovíz culture. The site is situated in a landscape with abundant deposits of gold, however, the origin of the material used for the manufacture of the gold piece of jewellery could not been ascertained. Not far from the cemetery, on the opposite bank of the brook, a similarly dated settlement was discovered through fieldwalking. [ABSTRACT FROM AUTHOR]

Veľké množstvá odpadov z elektrických a elektronických zariadení sa hromadia v celej Európe. Každý spotrebiteľ vyprodukuje priemerne 16 kg tohto odpadu za rok, čo v Európe predstavuje celkovo šesť miliónov ton za rok. Ide o obrovské plytvanie zdrojmi. Znamená to taktiež veľké ekologické nebezpečenstvo, keďže elektrické spotrebiče a elektronické zariadenia obsahujú vysoko toxické ťažké kovy a organické znečisťujúce látky. Podľa nových predpisov EÚ budú musieť výrobcovia odteraz platiť za zber a likvidáciu týchto výrobkov. Odpady ušľachtilých kovov Au-Ag predstavujú širokú škálu typov a foriem odpadov s rôznymi balastnými prvkami aj zložkami. Problematika spracovania odpadov s obsahom Au a Ag je vysoko aktuálnou v celosvetovom meradle z hľadiska hodnoty a špecifických vlastností týchto kovov ako aj ich nenahraditeľnosti v oblasti bankovníctva, zdravotníctva, priemyslu a v neposlednom rade aj v samotnej výrobe a predaji zlatníckych výrobkov. Predkladaný návrh možnosti spracovania Au-Ag zlatníckych a elektronických odpadov si kladie za cieľ získať zlato a striebro v kovovej forme. Aplikácia navrhovaného procesu spracovania uvedených Au-Ag odpadov predstavuje pre spoločnosť praktický, ekonomický a zároveň ekologický význam pri ich spracovávaní. Získavanie zlata, resp. striebra z Au-Ag odpadov je mimoriadne dôležité v podmienkach inflačného vývoja, kedy tieto ušľachtilé kovy sú stabilným zdrojom pokrývania potrieb spoločnosti.

Region Železných hor zaujímá plochu necelých 900 km2, přičemž na tomto relativně malém prostoru jsou zastoupeny téměř všechny geologické útvary, které v Českém masívu evidujeme. Tomu odpovídá i pestrá mineralogická a petrografická struktura. Sám název pohoří zmíněný již ve Zbraslavské kronice indikuje povědomí středověkého člověka o nerostném bohatství v této oblasti. Dosavadní archeologické bádání nevěnovalo problematice těžby nerostných surovin v převážně zalesněném prostoru Železných hor dostatečnou pozornost. V souvislosti s průzkumem zaniklých středověkých vsí se naše pozornost zaměřila nejen na podobu a strukturu zdejšího osídlení, ale i na počátky kolonizace zdejší oblasti, na způsoby exploatace místního nerostného bohatství a základní komunikační schéma oblasti. Jako modelová oblast výzkumu posloužil z písemných pramenů dobře známý tzv. bojanovský újezd vilémovského kláštera. Při severní hranici bojanovského újezdu se nalézají dvě sousedící rýžoviště zlata, která byla dřívějším bádáním kladena do laténského období. Jak ukazuje vazba na středověké osídlení, farní a komunikační síť, vrchol těžby leží ve 13. a na počátku 14. století.

Copyright of Prilozi za Istrazivanje Hrvatske Filozofske Bastine is the property of Institut za Filosofiju and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A non-cyanide gold bath has been used to deposit gold film on a brass substrate through electroplating process using supercritical carbon dioxide emulsion. The hardness of the deposited gold film was considered as a response variable to optimize the process parameters of electroplating operation by statistical experimental methods. Effects of current density, pressure temperature, and chemical composition of the solution were investigated to select the optimal operation factors. Scanning electron microscopy and micro- -hardness testing were applied to determine the characteristics of the metallic film. The screening of significant variables was examined by a 25-1 fractional factorial design with V resolution method. The experimental results showed that the significant variables affecting the deposition of gold film were current density, pressure and temperature. Based on Box-Behnken design and response surface methodology (RSM), a regression model was built by fitting the experimental results with a polynomial equation. The optimal operating variable conditions can be searched at a specified hardness for industrial hard and soft gold application ranged from 83.8 to 157.7 HV. [ABSTRACT FROM AUTHOR]

Copyright of Archaeologia Historica is the property of Masaryk University, Faculty of Arts and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Composition analysis of the so-called red corrosion on gold coins, plus discussion on its origin and possibilities of removal of the red stains are presented. Suggestion of a new alternative non-chemical method in cleaning of gold coins is published. [ABSTRACT FROM AUTHOR]

This paper deals with gold, which is described as a chemical element. Special attention is paid to its physical-chemical properties and, furthermore, where or in what form it can be found in nature. We discuss the role it has played through history and we inform how gold has been developed to the level it has reached today's value. Still more, when gold is broken into nanoparticles, this form could be highly useful for a wide range of processes, including general nanotechnology, electronics manufacturing and the synthesizing of different functional materials. It is important that we know that gold is also used in industry in many engineering applications (contacts in micro-electronics) and medicine (dental alloys, implants). [ABSTRACT FROM AUTHOR]

The article focuses on the value of gold coins and the Euros on the Greek-Turkish border. It says that gold coins and the Euros have the capacity to cross borders without the need for currency conversion. It states that gold sovereigns were used in social exchanges within and between families across the Aegean Sea. Moreover, it highlights the social implications of the shift from gold to Euros as a transnational currency for the peoples of Mytilene and their shifting relations with Ayvalik.

Copyright of Sociologija/Sociology: Journal of Sociology, Social Psychology & Social Anthropology is the property of MOD International and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)