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Further, the leaching data were analyzed using shrinking core model which revealed that the rate of leaching was inhibited by diffusion through product layer. Reaction kinetics is also to be contrasted with thermodynamics. Using Arrhenius law of thermodynamics, it was found that activation energy for Zn bioleaching reaction was 39.557 kJ mol−1.
Abstract: Chemical and biological leaching is practiced on a commercial scale for the mining of metals from ores. Although bioleaching is an environmentally-friendly alternative to chemical leaching, one of the principal shortcomings is the slow rate of leaching which needs to be addressed.
Chemical oxidation integrated into bioleaching of p yrite and chalcop yrite using immobil ized biomass Fig. 4. Rate of generation of Fe 2+ during chemical oxidati on of pyrite at dif ferent pulp ...
Souza AD, Pina PS, Lea˜o VA .2007. Bioleaching and chemical leaching as an integrated process in the zinc industry. Minerals Engineering Journal 20: 591–599. Svens K, Kerstiens K, Runkel M. 2003. Recent experiences with modern zinc processing technology. Erzmetall 56: 94–103.
Jun 26, 2008· The bacterial leaching of zinc and iron from solid wastes at the Isdemir iron and steel plant has been investigated using Acidithiobacillus ferrooxidans as the bacterial agent. The effects of a range of operational parameters, including particle size, solids concentration and pH, on the efficiency of the bioleaching process were investigated.
This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% Zn, 1.9% Pb, 31.8% S and 9.0% Fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the bioleaching residue were assessed.
In an ultrasound-assisted bioleaching process for the recovery of Zn, Cu, and Co from black shale, one group of researchers achieved optimal leaching efficiencies of 92% Cu and 87% Zn and 71% Co, respectively, at a sonication time of 7 min with 15 d of pre-growth and 36 d of bioleaching. 20 In the bioleaching of printed circuit boards (PCBs ...
2. Heap Leaching. In this technique, the ore is arranged in large heaps. During heap leaching, an aqueous mixture of microorganisms is sprinkled over the leach pile. Then, the solution is collected and processed to help recover even more metal. 3. In-situ Leaching. The ore remains in its natural state while the leaching process takes place.
Biological leaching of fly ash from municipal waste incineration by Aspergillus niger was examined in batch cultures and compared with chemical leaching. A. niger grew in the presence of up to 10% (w/v) of fly ash in the medium. In the presence of fly ash A. niger produced gluconate, whereas in its absence citrate was produced. Variation of the fly ash concentration in the growth medium (one ...
May 01, 2007· Considering bioleaching and chemical leaching as integrated processes, the overall leaching time is reduced as compared to that observed by Pani et al. (2003) for the complete bioleaching of ZnS; nevertheless the residence time is still relatively large. As a result, this route would be most suitable for small expansions in RLE plants, such as ...
Mar 01, 2019· Bioleaching experiments with a mixed Acidithiobacillus-culture were carried out in shake flasks as well as in column percolators with crushed and sieved sphalerite-rich ore from a former mine in the German Harz Mountains.Efficient sphalerite dissolution in the bioleaching assays was observed in contrast to the chemical leaching experiments.
Bioleaching experiments were successfully performed in this medium to recover gold and copper from telecommunication printed circuit boards. The results of inductively coupled plasma (ICP) analysis confirmed that gold recovery peaked out at around 55% after 4 days, whereas copper recovery continued to increase for several more days, peaking out ...
Bioleaching and chemical leaching as an integrated process in the zinc industry Adelson D. de Souza a, Pablo S. Pina b, Versiane Albis Lea˜o b,* a Votorantim Metais Zinc – Technologies Development Centre, BR 040, Km 274-Treˆs Marias, MG 39205-000, Brazil b Universidade Federal de Ouro Preto, Department of Metallurgical and Materials Engineering, Nu´cleo de Valorizac¸a˜o de Materiais ...
Bioleaching does not recover the precious metals in the ore. The precious metals are often an important component in the profitability of the operation. The requirement for the smelter to produce acid for conventional leaching and to supplement bioleaching if the ore body is high in acid consuming minerals.
Jul 14, 2020· S. Mithra Last Modified Date: July 14, 2020 . Bioleaching is the use of bacterial microorganisms to extract precious metals, such as gold, from ore in which it is embedded.As an alternative to smelting or roasting, miners use bioleaching when there are lower concentrations of metal in ore and they need an efficient, environmentally responsible method to extract it.
This work investigated the effects of Fe3+, H+ and adsorbed leaching bacteria on the bioleaching of pentlandite. Collectively, an integrated model for the oxidation and decomposition of pentlandite was built to describe the behaviors of different components in a bioleaching system. Proton ions and ferric ions could promote the break and oxidation of Ni-S and Fe-S bonds.
In bioleaching of pyrite there is an initial chemical leaching where Fe 3+ oxidises the mineral: 4FeS 2 + 4Fe 2 (SO 4 ) 3 → 12Fe(SO 4 ) + 8S The ferrous sulphate and elemental sulphur formed is then oxidised with the aid of microbes according to the following reactions:
Jul 01, 2012· de SOUZA A D, PINA P S, LEAO V A. Bioleaching and chemical leaching as an integrated process in the zinc industry [J]. Minerals Engineering, 2007, 20(6): 591–599. Article Google Scholar . HOANG J, REUTER M A, MATUSEWICZ R, HUGHES S, PIRET N. Top submerged lance direct zinc smelting [J]. Minerals Engineering, 2009, 22(9/10):742–751.
This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% Zn, 1.9% ...
Bioleaching has been discussed with copper, uranium, gold, silver and silica. Copper Leaching Throughout the world copper leaching plants have been widely used for many years. It is operated as simple heap leaching process or combination of both heap leaching and in situ leaching process. Dilute sulphuric acid (pH 2) is percolated down through ...
Abstract This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% Zn, 1.9% Pb, 31.8% S and 9.0% Fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the bioleaching residue were assessed.
Nov 01, 2015· Recently, a novel integrated bioleaching system with stable pH-silver ion-chloride ion has been proposed to enhance bioleaching efficiency of chalcopyrite using mixed strains of Acidithiobacillus (Feng et al., 2013). Thorough this integrated system, the formation of S° and jarosite precipitation was largely minimized.
It is as-sumed that chemical leaching by biogenic Fe3+ integrated into the processes of leaching of PCB's may contribute to intensification of extraction of copper and other valuable metals from different secondary resources. ... Long-term objective is to study the peculiarities of bioleaching of secondary raw materials, reveal the role of ...
4 Factors influencing bioleaching. The leaching effectiveness depends largely on the efficiency of the microorganisms and on the chemical and mineralogical composition of the ore to be leached. The maximum yields of metal extraction can be achieved only when the leaching conditions correspond to the optimum growth conditions of the bacteria ...
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