USING APLICATIVE SOFTWARE AND SOFTWARE TOOLS FOR THE PERFORMANCE OF LEACHING AND BIO-LEACHING (original) (raw)
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Estimation of Reagent Consumption in Lead Flotation of a Zinc Leach Residue
Canadian Metallurgical Quarterly, 2005
Recovery of lead from a zinc leach residue of an oxidic ore was investigated using the sulfidization-flotation method on a laboratory scale. The residue was leached to eliminate its soluble compounds. The sulfidization-flotation experiments were carried out on a bench scale and different parameters such as sodium sulfide, collector concentration and pH were examined. Finally, the sodium sulfide and collector concentration resulting from the batch flotation were compared with the one estimated using the microflotation results in literature. Résumé-On a étudié la récupération du plomb à partir d'un résidu de lessivage du zinc d'un minerai oxydé en utilisant la méthode de sulfuration-flottation à l'échelle du laboratoire. On a lessivé le résidu pour éliminer ses composés solubles. On a effectué les expériences de sulfuration-flottation à l'échelle du laboratoire et l'on a examiné différents paramètres comme le sulfure de sodium, la concentration du collecteur et le pH. Finalement, on a comparé le sulfure de sodium et la concentration du collecteur résultant de la flottation en discontinu avec les valeurs estimées en utilisant les résultats de microflottation de la littérature.
E3S Web of Conferences, 2016
There are many test methods to assess the level of the release of heavy metals into the environment from mineral waste materials. Leaching methods can be different depending on the leaching time periods, leaching dynamics, sample preparation method or the pH of the elution medium. In Poland, little attention is paid to the research on the relationship between the leaching of particular heavy metals from mineral wastes and changes in environmental conditions, including the pH of the environment. Tests being carried out abroad have started to pay great attention to the pH-dependent impact of the environment and the liquid being in contact with the material on the degree of leaching contaminants from wastes. The solubility of all metals depends on the value of the pH. Authors of the paper will try to prove that Polish methods of waste characterization is incomplete and inconsistent with opinions prevailing in the global literature. The procedure described in the Polish standards are insufficient to determine the actual level of leaching of heavy metals having regard to the impact of multiple external conditions on the level of leaching of heavy metals. Paper will present a directions of development of research methods in the assessment of leaching of heavy metals from mineral waste.
The article reports the chemical characteristic of acid mining drainage waters as well as the results of leaching experiments conducted with and Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans at the same conditions in solution. The experiments were realized realized using tailing impoundment sediments and ore minerals from the Sb-(Au-) base metal deposit Pezinok (Malé Karpaty Mts., Western Carpathians, Slovakia). The research study shows the oxidation sequence and the leaching progression on surface of the following ore minerals: löllingite, arsenopyrite, stibnite, native Sb, gudmundite, berthierite, pyrite, sphalerite and chalcopyrite. The differences between chemical and biological-chemical leaching activity of various ore minerals on the polished sections surface is discussed. The extent and the kinetics of the biological-chemical leaching of ore minerals is significantly higher than the chemical leaching of ore minerals without bacteria.
Journal of Environmental Monitoring, 2001
The extent of pollution was investigated in sediments collected along the course of the river Meža and its tributaries in the lead and zinc mining area of the Mežica valley (Slovenia). In order to evaluate the heavy metal burden, total concentrations of Zn, Pb and Cd were determined and the partitioning of these metals between the easily and sparingly soluble sediment fractions was performed by the use of the slightly modified BCR sequential extraction procedure. The quality of analytical data was checked with Certified Reference Material CRM 601. Good agreement between the determined and certified or indicative metal concentrations was obtained. In order to estimate the natural and anthropogenic inputs of Zn, Pb and Cd in the sediments, normalisation to Al was applied. The results of the partitioning study indicate that Zn prevails in the most sparingly soluble fraction and is distributed between organic matter and sulfides, while a smaller proportion is found in the easily soluble fraction. Pb is distributed mainly between organic matter and sulfides, whereas Cd is predominantly associated with the most sparingly soluble fraction. Data from the normalisation procedure indicate that the anthropogenic inputs of Zn, Pb and Cd correlate with the very high total metal concentrations determined in sediments. The highest total Zn, Pb and Cd concentrations (16.3, 9.3 and 0.13 g kg 21 , respectively) were found in the sediment of the Helena rivulet, arising from former mining activities. In spite of the relatively low easily soluble metal fractions in the sediment, the concentrations of metals in these fractions are high, owing to the extremely high total metal concentrations. These data indicate severe pollution of the terrestrial and aquatic environment.
2007
In the northern part of Hungary in Matra-Mountains non-ferrous metal ore mining lasted through centuries up to 1986. Initially gold and silver, then lead and silver, and finally in the XX th century lead and zinc were the target metals. Nevertheless the real industrial-scale mining lasted only in the period 1950-1986 when mining ceased. From that time only mine water treatment has been carrying out. In this paper a general overview of the planned remediation of the site is presented. Detailed data are presented on reconstruction of the mine water treatment plant.
Pre-Enrichment of Lead-Zinc Leaching Tailings by Hydrocyclone
2018
Bu calismada, tipik bir kursun-cinko lic tesisi kati atiklarinin on zenginlestirilmesi arastirilmistir. Lic islemi sonrasinda kalan minerallerin (filtre keki) tane boyutunun buyuk oranda dusmesi ve mineral kristal yapilarinin bozulmasi sebebi ile flotasyon, multi gravite separator (MGS), sallantili masa ve Knelson separatoru gibi cevher zenginlestirme yontem/makineleri ile kursun (Pb) ve cinko (Zn) icin verimli bir konsantre elde edilememistir. Tane boyutu faksiyonuna gore yapilan kimyasal analizlerde Pb ve Zn minerallerinin cok ince boyuttaki fraksiyonlarda (<75 µm) yogunlastigi tespit edildi. Boylece, zenginlestirme metodunun tane boyutuna gore siniflandirma ile yapilmasina karar verilmis ve zenginlestirme prosesinde sirasiyla 150 mikronluk elek ve hidrosiklon kullanilmistir. Eleme sonrasinda % 86,64 Pb ve % 64,84 Zn verimleri ile konsantre (agirlikca % 51,35) urun elde edilmis ve bu konsantre kullanilarak bir dizi hidrosiklon deneyleri ile zenginlestirme prosesine devam edilmi...
Studies on zinc recovery from technogenic waste
E3S Web of Conferences, 2021
Results from laboratory experiments are presented on extraction of zinc available in waste from lead-zinc metallurgy, mixed with lead-zinc flotation tailings and some waste rock, by leaching it under atmospheric conditions with sulfuric acid (H2SO4) solutions (5 and 10 wt. %) and 30 % hydrogen peroxide in the temperature range of 25 - 80 °C, at leaching time 30 - 120 min. Material leaching with 10 % H2SO4 solution at 70 °C for one hour brings into pregnant leach solution (PLS) around 80 % of zinc available. Imposing an electrochemical impact during the leaching process increases the quantity of leached zinc by around 5 %. Direct electrowinning from the PLS obtains zinc metal of grade 75-76 %. The suggested treatment removes metals-pollutants from accumulated mixed technogenic waste therefore rendering it more environmentally friendly. Experiments showed that old mixed waste from mining, mineral processing and metallurgy activities merits further studies as secondary source of metals.
Chemical Papers, 2019
This investigation compares bacterial leaching to chemical leaching to solubilize copper from a copper containing ore of the new site Northern Qarashoshaq in Zhylandy (Kazakhstan) which is currently under commercial development. From ICP-OES analysis the bulk ore sample contains 1.5% of Cu and a trace level at 0.0024 % of Ag. Phase analysis shows the main copper containing minerals are covellite, сhalcocite, malachite, chrysocolla and chalcopyrite. According to X-ray diffraction analysis silver is mainly presented as jalpaite (Ag3CuS2) minerals. Copper leaching was carried out by acidophilic bioleaching for comparison with extraction by chemical methods involving the addition of sulfuric acid and Fe3+ or only sulfuric acid in flasks, as well as column leaching tests to simulate heap leaching. Ag was extracted by cyanidation methods again in flasks as well as column leaching tests. Results showed that copper extraction is up to 95% when using bioleaching in the flask, 83% in the case of Fe3+ with sulfuric acid and 76% for sulfuric acid. Furthermore, subsequent extraction of Ag reaches 97% for bioleaching and 92% for chemical leaching. Column bioleaching tests showed an 82.3% yield of copper after 70 days of the experiment and a 70% of silver, whereas for chemical leaching the yield of copper is 66.8% and silver is 51%. In conclusion this investigation demonstrated higher extraction for both copper and silver from the primary ore in the bioleaching sample compared to the chemical leaching sample. More silver was extracted in the bioleaching case as there was less copper remaining to compete for the cyanide anions.
2018
Finding a cleaner, environmentally friendly and cost-effective way of metal and mineral extraction has a great importance in today’s world. Using microorganisms in bio-leaching and bio-oxidation process is of great value. From Archaea to bacteria and fungi, microorganisms can play an important role in extraction of metals from mine drainage and un-accessible sources, both in aquatic and terrestrial environments. Optimization of environmental factors such as the temperature, pH and substrate concentration is crucially important to access the optimum extraction of selected metals from an ore or mine drainage. The present paper will review the bio-leaching and bio-oxidation process of minerals with emphasis on the most well-known species of bacterial communities of such ability, through the literature.
Bacterial leaching of zinc from flotation tailings
The Journal of General and Applied Microbiology, 1991
Bacterial leaching (bioextraction) has been developed recently for the recovery of zinc from sulfide-bearing ores, and applied for commercial exploitation of low-grade sulfide-bearing ores and wastes (7). The bacterium responsible for the oxidation of metal sulfides, Thiobacillus ferrooxidans, is chemolithotrophic, i.e., it derives the necessary energy by oxidizing ferrous iron and reduced inorganic sulfur compounds (18); carbon is obtained from atmospheric carbon dioxide and nitrogen from dissolved ammonia and nitrate (4). Bioextraction is promising when the metal-to-gangue ratio is unfavorable for conventional pyrometallurgical or hydrometallurgical methods. Bacterial leaching of insoluble metal sulfides is by microbiological oxidation. For the oxidation of zinc sulfide, the overall equation can be written as (I1): ZnS + 202 T. ferrooxidans Zn504.