In this study, bottom ash from the Tuncbilek power plant has been characterized by X-ray fluorescence, X-ray diffraction, and infrared analysis. The bottom ash sample is potentially of class C type and has unburned carbon. The unburned carbon was separated from the bottom ash in a laboratory flotation cell. In the flotation experiment, sodium silicate (as a potential dispersant and depressant), butanol (promoter), kerosene oil (collector), and pine oil (frother) were used and the optimization of these flotation reagents were done through statistical modeling using a full two-level factorial design in order to evaluate the main and interaction effects of variables in flotation of unburned carbon; the evaluation of the results was done by Yates' notation. Test results showed that a product with 45.41% combustible grade at 40.0% recovery and 94.86% ash rejection was obtained at 1.98 g/kg sodium silicate, 1.38 g/kg promoter, 4.95 g/kg collector, and 2.41 g/kg frother.
In this article, the efficiency of microwave pretreatment, which is an environmentally friendly, low-energy consuming method for recovery from refractory gold-silver ores, was investigated. The ore sample belonged to the oxidized Bolkardağ deposit, which contains carbonate (calcite, dolomite, smithsonite, hydrozincite), silicate (quartz, hemimorphite), sulfate (beudantite, plumbo-jarosite), and iron oxy/oxyhydroxide (hematite, limonite) minerals. Sulfur/sulfate-bearing silver and gold minerals are found either together with gangue minerals or in inclusions. Approximately 90% gold and 48% silver recovery efficiencies were achieved with the cyanide process after microwave preroasting from the ore. Additionally, the ore, heat treatment product, and waste samples were investigated by characterization studies. In these studies, bond structures, mineral content, sample mass losses, element percentage content differences, and mineral percentage content differences in the samples were determined. As a result, the microwave pretreatment application in cyanidation was presented as a new research topic in terms of its application in the valuable refractory content of this type of oxide.
Bu çalışma da, Niğde Ulukışla Gossan yapılı altın gümüş cevherlerine, alkali ortamda siyanür parametresinin etkinliği incelenmiştir. Cevherin mineral yapısında; demir cevherleri (limonit-götit-lepidokrosit), çinko mineralleri (smitsonit-hidrozinkit-hemimorfit), kurşun mineralleri (serüzit-plumbojarosit) ve gang mineralleri (kil-kuvars-kalsit) bulunmaktadır. Tüm bu minerallerin yanı sıra cevherdeki farklı jarosit formları da Gossan cevheri yapısı ile uyumludur. Cevher mikroskobisi ile altının limotit-götit-lepidokrosit mineralleri ile beraber bulunduğu belirlenmiştir. Direk siyanürleme testlerinde altın ve gümüş düşük verimlerle kazanılmıştır. Bu amaçla, siyanürleme öncesinde sıcak alkali kireç ön işlemi ve ardından da siyanür araştırmaları gerçekleştirilmiştir. Siyanür miktarı tayini 24 saat ve 60°C sıcaklıkta, 0,125-4 g/L NaCN konsantrasyonları arasında, siyanür süre araştırmaları ise, 1,5 g/L NaCN konsantrasyonunda, 60 °C sıcaklıkta, 1-84 saat arasındaki sürelerde gerçekleştirilmiştir. Sonuçta, altının % 64-97 arasına, gümüşün de % 55-76 arasına kadar arttığı belirlenmiştir.
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