Tank leaching - BioMineWiki

May 16, 2008 ... Tank leaching can be performed as a batch process but is normally operated as a continuous process. Leaching is usually carried out in a series of tanks. In a continuous stirred tank reactor (CSTR) series leaching is co-current, i.e. a pulp of ore/concentrate and leaching reagents are pumped into the first...

Agitated Tank Bioleaching - MINTEK | MINTEK

Biotechnology. As near-surface oxide orebodies are depleted, mines are having to process deeper sulfide ores that are lower in metal grade and metallurgically more complex. Modern technologies that are simple, cost effective and environmentally sound are required for their extraction. In many cases, bioleaching is the...

Agitated Tank Bioleaching of Dirty Chalcopyrite Concentrate - Mintek

One application to which agitated tank bioleaching has been found particularly suitable is the treatment of dirty concentrate produced from mixed copper and zinc ore (which is also contaminated with lead, silver and other metals). It is not possible to produce clean flotation concentrates of copper and zinc separately, due to...

Review of Biohydrometallurgical Metals Extraction from ... - MDPI

Dec 24, 2014 ... with the successful applications of stirred tank bioleaching to a polymetallic tailings dump and heap bioleaching to a polymetallic black schist ore, there is no reason why those proven technologies should not be more widely applied. Keywords: polymetallic; concentrates; tailings; black shales; bioleaching;...

Lecture 5 Reactor Bioleaching And Developments In ... - nptel

Keywords: , Reactor Leaching, Bioleaching Of Metal Concentrates, Recent Developments. Metal sulfide concentrates are generally bioleached in stirred tank reactors (agitation leaching). Several designs of bioreactor configurations are available (Fig.5.1). Feed. Air. Pachuca Reactor. Air Input. Agitated Tank Reactor. Fig.

Bioleaching of uranium in batch stirred tank reactor: Process ...

To design industrial reactors, it is important to identify and optimize the effective parameters of the process. Therefore, in this study, a three-level Box–Behnken factorial design was employed combining with a response surface methodology to optimize pulp density, agitation speed and aeration rate in uranium bioleaching in...

Biotechnology Processes in Mining | Biotechnology - TechnoMine

Commercial applications include processing of refractory gold concentrates to release gold for conventional recovery and the bioleaching of copper in heap and dump leach operations. Commercial application of stirred tank bioleaching for the recovery of copper has also developed rapidly in recent years with the...

Bioleaching of Sulfide Mineral in Stirred Tank Reactors Operated in ...

Nov 28, 2010 ... This paper reviews analysis and modeling for the bioleaching of pyrite in stirred tank reactors operated in a variety of modes: batch, repeated-batch and continuous flow. In a batch reactor, rate data were consistent with a kinetic model assuming that the growth rate of adsorbed bacteria on the mineral...

Bioleaching of an organic-rich polymetallic concentrate using stirred ...

Sep 30, 2010 ... Bioleaching of an organic-rich polymetallic concentrate using stirred-tank technology. Pauline Spolaore, Catherine Joulian, Jérôme Gouin, A. Ibanez, Thierry Augé,. Dominique Morin, Patrick D'Hugues. To cite this version: Pauline Spolaore, Catherine Joulian, Jérôme Gouin, A. Ibanez, Thierry Augé, et al.

Operation Pilot Plant Stirred-Tank Bioleaching a ... - CiteSeerX

Aug 13, 2002 ... Microorganisms were enumerated and isolated on selective solid media from a pilot-scale stirred-tank bioleaching operation in which a polymetallic sulfide concentrate was subjected to biologically accelerated oxidation at 45°C. Four distinct prokaryotes were isolated: three bacteria (an Acidithiobacillus...

Oxygen and carbon dioxide kinetic challenges ... - Semantic Scholar

Abstract. Agitated bacterial tank bioleaching reactors are currently sparged with air to satisfy both oxygen and CO2 requirements of microbial cells. Under high-sulphide loading conditions, as is the case with high-grade metal sulphide concentrates, the microbial and chemical demand for oxygen is significantly increased...

Mineral bio-processing: an option for recovering strategic ... - prometia

Stirred tank leaching. • Used for mineral concentrates (chiefly refractory gold) and at pulp densities of. ~20%. • Most stirred tanks operate at between 35 and 45°C; cooling is a major operating cost. • Tanks are generally constructed of high-grade stainless steel. • Tanks are actively aerated. • Agitation (stirring) is another...

Quantitative Monitoring of Microbial Species during Bioleaching of a ...

Stirred tank bioreactors for the leaching of copper concentrate, housing a consortium of acidophilic, moderately thermophilic bacteria, relevant in several bioleaching operations, served as a model system. The microbial community analysis via qPCR allowed a precise monitoring of the evolution of total biomass as well as...

Heap Bioleaching of Refractory Arsenic Gold ... - EBSCOhost

INTRODUCTION. Since biooxidation has been used in pretreatment of refractory sulfidic gold ores, a few techniques and patent have been developed for this process, such as BIOX, BacTech,. MINBAC, BIONC, bio-leaching1,2. The main leaching proce- sses include agitated tank bioleaching and heap bioleaching.

Tank leaching - Wikipedia

The viscosity, in turn, controls the gas mass transfer and the leaching rate. Numbers of tanks - Agitated tank leach circuits are typically designed with no less than four tanks and preferably more to prevent short-circuiting of the slurry through the tanks. Dissolved gas - Gas is often injected below the agitator or into the vat to...

The microbiology of biomining: development and optimization of ...

tank results in a limited ecological niche that tends often to be dominated by two to four species, although smaller numbers of other micro-organisms may be present. (Table 1). For example, Mikkelsen et al. (2006) found that the microbial populations in thermophilic (78 uC) stirred tanks leaching chalcopyrite were entirely...

Design of a reactor bioleach process for refractory gold treatment

coalescence; and (viii) gas hold-up. In order to determine the key variables affect- ing oxygen mass transfer and hence enable the design of an efficient bioleach reactor, a clear. 3000-1 PVC test vessel was constructed. The ves- sel could be configured as a conventional stirred tank reactor (STR) or in a draft tube arrange-.

A Mintek perspective of the past 25 years in minerals bioleaching

This paper reviews the historical development of minerals bioleaching processes and gives an update on the current status of commercial tank and heap bioleach .... M., HALLBERG, K.B., and JOHNSON, D.B. Enumeration and characterization of acidophilic microorganisms isolated from a pilot plant stirred tank bioleaching...

Bioleaching of chalcopyrite concentrate by a moderately ...

Furthermore, after being adapted to gradually increased concentration of chalcopyrite concentrate, the tolerance of the mixed culture to chalcopyrite concentrate was brought up to 80 g/L. The effects of several leaching parameters on copper recovery in stirred tank reactor also had been investigated. The results of the...

Bioleaching of low-grade copper sulfide ores byAcidithiobacillus ...

The grown conditions of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans were investigated, and then experiments were conducted to research the bioleaching behaviors of crude ore of copper sulfide and hand-picked concentrates of chalcopyrite by Acidithiobacillus ferrooxidans and Acidithiobacillus...

A Fuzzy Logic Model to Predict the Bioleaching Efficiency of Copper ...

Multiplicity of the chemical, biological, electrochemical and operational variables and nonlinear behavior of metal extraction in bioleaching environments complicate the mathematical modeling of these systems. This research was done to predict copper and iron recovery from a copper flotation concentrate in a stirred tank...

Bioleaching of Arsenic-Rich Gold Concentrates by Bacterial Flora ...

Oct 30, 2013 ... In order to improve the bioleaching efficiency of arsenic-rich gold concentrates, a mixed bacterial flora had been developed, and the mutation ..... and Y. Guo, “UV induced mutations in Acidianus brierleyi growing in a continuous stirred tank reactor generated a strain with improved bioleaching capabilities,”...

Effect of Temperature Ramping on Stirred Tank Bioleaching of a ...

Aug 21, 2017 ... All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans. Tech Publications, www.scientific.net. (#106911637, Google Scholar-16/02/18,14:08:04)...

TRANSFER OF 0 2 FROM AIR TO MINERAL SLURRIES IN A ...

Oxygen transfer from dispersed air in agitated slurries represents an important unit operation ... treatment of gold containing ores prior to cyanide leaching has resulted in a large increase in gold recovery. Marchant ... Inclined Plate (DIP) bioreactor [4] with those for Rushton turbine agitated tanks, it was decided to measure.

Bioleaching is the extraction of metals from ores ... - Shodhganga

temperature increased the extent of metal extraction from certain minerals, most notably bioleaching of copper from chalcopyrite (CuFeS2). There is considerable interest today in applying thermophiles to bioleach chalcopyrite in stirred tank reactors and in bioheap leaching. The discovery of unusual, extremely thermophilic...

The microbial role in acid leaching sulphide environments

Tank Bioleaching. • Bacterial oxidation of ground mineral slurry can be carried out in aerated agitated vessels. • Due to capital costs usually only used for high grade ores. • Oxidation kinetics are much higher than in situ or heap systems...

US6063158A - Sulfide mineral concentrate bioleaching - Google ...

Stirred tank leaching of concentrates has several drawbacks, typically making it economically unviable. First, many concentrates are refractory to solubilization and require long residence times. Second, high power consumption is required for suspending and mixing of concentrates. In certain instances, stirred tank leaching...

Bioleaching of chalcopyrite - Core

bioleaching of the chalcopyrite concentrate in a stirred tank bioreactor for the purpose of scaling up, and investigated the effects of agitation speeds. Finally, the bioleaching of low-grade copper ores has been briefly studied. The results show that the rate of copper dissolution has a positive relationship with bacterial growth...

Microbial Leaching of Uranium Ore - InTechOpen

Sep 9, 2011 ... In general, types of microorganisms found in heap leaching processes are similar to those found in stirred tank processes, however, the proportions of the microbes may vary depending on the mineral and the conditions under which the heaps or tanks are operate. In processes that operate from ambient...

The use of reactors in biomining processes - Bioline International

Tel: 56-32-273644. Fax: 56-32-273803. E-mail: [email protected] Financial support: FONDECYT Grants 1980338 and 1000284 UCV Projects 203.703/98 and 203.715/00. Keywords: bacterial leaching, bioleaching, biooxidation, bioreactors, stirred tanks, Thiobacillus. Microbial processes applied to mining operations are.

Microbial oxidation of gold ores and gold bioleaching

leaching of the parent ore would require addition of sulfuric acid due to low concentrations of sulfide in the ore. A refractory flotation concentrate (4 g t -1 gold) of waste tailings from a New Guinea gold ore was bio-oxidized in semi-continuous and con- tinuous stirred tank reactors [16]. Biooxidation of. 50% of the pyrite...

BIOLEACHING OF LOW -GRADE NICKEL ... - uO Research

considerable phenotypic heterogeneity within the species. Additional stirred-tank bioleaching experiments were conducted with five other nickel sulphide ores from different geographical locations across Canada. Mineralogical and chemical examination revealed considerable variability between the samples, particularly in.

MEI Blog: International Biohydrometallurgy Symposium (IBS) 2017 ...

Oct 23, 2017 ... Today began with a session on "Tank Leaching" and the first of ten keynote lectures. Patrick d'Hugues, Head of the Waste and Raw Material Unit at BRGM, France, presented, "Bioleaching in stirred tanks reactors to process Kupferschiefer type of ore: A review", in which he gave an overview of the work...

Ali Ahmadi - Google Scholar Citations

Separation of Cu from dilute Cu–Ni–Co bearing bioleach solutions using solvent extraction with Chemorex CP-150. AS Sadat, A Ahmadi, H Zilouei. Separation Science and Technology 51 (18), 2903-2912, 2016. 1, 2016. A Fuzzy Logic Model to Predict the Bioleaching Efficiency of Copper Concentrates in Stirred Tank...

Bioleaching Provides Better Alternative to Copper Smelting |

Jan 21, 2015 ... Taking this in mind, a dump leach operation may take four or more years to produce results, while heap leaching may take between five and ten months, and a stirred tank reactor may take less than a month. Bioleaching can also be applied to treat a variety of environmental problems. It can be used to treat...

Bioleaching of chalcopyrite by pure and mixed culture

commercial biooxidation tanks that operate at 40 ℃ [J]. Applied and Environmental Microbiology, 2003, 68(2): 838−845. [8]. OKIBE N, GERICKE M, HALLBERG K B, JOHNSON D B. Enumeration and characterization of acidophilic microorganisms isolated from a pilot plant stirred-tank bioleaching operation [J]. Applied and...

'Zimbabwe should harness biomining' | The Chronicle

Apr 10, 2017 ... Copper dump and heap-leaching applications have been used mainly in South America while globally; there has been agitated tank bioleaching of refractory gold concentrates. “More recently, agitated tank bioleaching of copper and nickel sulfide concentrates has been done.” In Chile, scientists are using...

Leaching Agitation Tank - Shandong Xinhai Mining Technology ...

In the gold extraction process, leaching agitation tank is applied to leach and carbon-absorb gold ore pulps. Xinhai leaching tank is more professional.

Biohydrometallurgy '18

12.30 Influence of CO2 supplementation on bioleaching kinetics in stirred tank reactor. A.-G. Guezennec, C. Joulian, J. Jacob, F. Bodenan and P. d'Hugues (BRGM, France). 12.50 Lunch. 14.00 Technical Session 2. Chairmen: TBA. 14.00 A novel understanding of chalcopyrite and bornite bioleaching mechanism: redox...

An update on possibilities of metals recovery from Polish copper ...

a continuous stirred tank reactors technology (CSTR) [5]. The solid/liquid ratio applied in the bioleaching circuit was 15%. As one of the main results of this project, a general concept of the bioleaching technology for the. Lubin copper concentrate was proposed. Within this concept, the bioleaching of the Lubin concentrate in.

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