+ 86 13953560679
Leaching mechanisms. Some of the best known bioleaching reactions include when metal is released from sulfide minerals by Fe 3+ oxidation of the metal sulfide bond and is catalyzed by acidophilic iron oxidizing microorganisms that convert the resulting Fe 2+ back to Fe 3+.
The bioleaching unlike the leaching is a process catalyzed by bacteria to obtain copper. Generally, the material containing copper is previously agglomerated to build piles. A three dimensional mathematical model to describe the fluid mechanics, mass and heat transport that consider source terms
In recent years, investigations were carried out on the application of the bioleaching technique to recover the nonferrous metals from pyrometallurgical slags, involving copper smelting slags [37, 38].
Apr 29, 19990183;32;The bacteria were isolated from post flotation wastes in the course of copper bioleaching research. The strains were cultivated on mineral medium with post flotation wastes as a substrate (thiosulphate in mineral Beijerinck's medium was replaced by 10 g post flotation waste).
The bioleaching data from copper smelters dust followed the diffusion controlled 400 shrinking core kinetic model at the temperature 32 8C and up to 4% 300 of solid concentration. Higher pulp density about 7% may interfere with the mass transfer of oxygen and carbon dioxide.
A Column Bioleaching Model for Chalcocite An Investigation of Oxygen Limitation and Bacterial Inoculation on Leaching Martin J. Leahy 1,2, Malcolm R. Davidson 1 and M. Philip Schwarz 2 1Department of Chemical and Biomolecular Engineering, The
In 2001, bioleaching constituted approximately 10% of Chilean copper production and heap and dump leaching, in general, constituted approximately 30% of Chilean production. 2 The first Chilean plant to be put into operation was S.M. Pudahuel.
A Coupled Model for Solution Flow and Bioleaching Based on the basic seepage law, equations have been derived to descript the solution flow within the copper
Beginnings of rational bioleaching and highlights in the development of biohydrometallurgy A brief history Bioleaching is an industrially exploitable process involving the mobilization of metals from ores with the copper led in time to mobilization of the copper, which could then be recovered from solution as cupric
copper production from the process increasing from 0.2% to approximately 8 10%. Bioleaching of copper in heaps was first recorded at the Rio Tinto mine in 17th century. The first modern industrial scale copper heap bioleach, producing 14,000tpa, commenced in 1980 at Lo Aguirre in Chile.
Based on the basic seepage law, equations have been derived to descript the solution flow within the copper ore heap which is treated as anisotropy porous media. The relationship between heap permeability and pore ratio has been revealed. Given the consideration of cover pressure and particle dissolution, pore evolution model has been set up.
Copper Leaching from Chalcopyrite Concentrates Shijie Wang progress may be made. shown in Equations 1 and 2 (all equations are shown in Table I). The corresponding tion plant for the bioleaching of copper concentrates in Monterrey, Mexico.13 Conducted in a series of countercur
The highest copper recovery was equivalent to 69.91%, obtained after 21 days at 35 degrees using the Acidi Thiobacillus Ferrooxidans bacteria and a K9 medium with a pulp density of 10% and pH 1.5. Keywords Optimization, Copper, Bioleaching, Bacteria, Acidi Thiobacillus Ferrooxidans .
during the reaction are called spectator ions. Spectator ions can be left out of the equation, giving. Fe (s) + Cu 2+ (aq) Fe 2+ (aq) + Cu (s) This is the ionic equation for the reaction between iron and copper(II) sulfate. Iron is oxidised and copper is reduced. Similarly, the reaction between tin and lead chloride may be written as
Key words bioleaching, shrinking core model, black shale INTRODUCTION Much attention was focused on studies of shrinking core models in the last years (Brochot, 2004; Crundwell, 1997; Lapidus, 1992; Pritzker, 1996, 2003; Vegli242;, 2001; Velardo, 2002, and others). They adapted earlier model equations to their experiments.
Bioleaching of uranium and copper has been widely commercialized. But large scale leaching process may cause environmental problems when dump is not managed properly. This results in seepage of leach fluids containing large quantity of metals and low pH into nearby natural water supplies and ground water.
Concept diagram for the purification of copper by electrolysis of copper salts solution with copper electrodes. ELECTROCHEMISTRY INDEX 1. INTRODUCTION to electrolysis electrolytes, nonelectrolytes, electrode equations 2. Electrolysis of acidified water (dilute sulfuric acid) 3.
At this stage of the process, the chemical reactions begin. They convert the copper minerals into copper metal. We can illustrate the types of process using the example of chalcopyrite CuFeS 2.From the formula, it is clear that iron and sulphur have to be removed in order to produce copper.
of copper dissolution but when ferric iron was added, despite a higher initial rate of copper dissolution, leaching process stopped. Addition of both ferrous and ferric iron to the bioleaching medium levelled off the copper extraction and had an inhibitory effect which decreased the final redox potential.
Copper ores include copper(II) oxide and copper(II) sulfide. Copper ( II ) oxide can be reduced by reaction with carbon . Some c opper ores may contain only small amounts of copper .
Based on the momentum and mass conservation equations, a comprehensive model of heap bioleaching process is developed to investigate the interaction between chemical reactions, solution flow, gas flow, and solute transport within the leaching system.
1 (a) (iii) One way to extract copper from low grade ore is to use bioleaching. Bioleaching is a method where bacteria grow on low grade ore and produce a solution of copper sulfate. The copper is extracted from the solution using scrap iron. Explain why scrap iron is used to extract the copper from copper sulfate solution. [2 marks]
Bioleaching is an efficient, simple and eco friendly process for metal extraction from ores and concentrates as compared to other conventional processes. Bioleaching is used essentially for the recovery of gold, copper, cobalt, nickel, zinc and uranium , .
In bioleaching of copper concentrates, redox potential is one of the most important environmental parameters which affect biological and chemical subsystems. It increases by the activity of
= residual copper concentration. Another application was in precious metals, cyanidation of gold ore. Here the rate equation was as in (10) gt; @ [ ] [ * ] dt Au. k C C. Au d Cu (10) In (10), [C* Au] = concentration of completely refractory gold. In both examples, the proposed model showed good agreement with experimental data.
studies on the bioleaching of arsenopyrite and pyrite in an attempt to identify areas which require further research in order to develop a model which can be used to accurately describe the kinetics of the process. The bioleaching of arsenopyrite From Equation  it is clear that the bioleaching of
equations for bioleaching of copper Producing Copper Nature's Way BioleachingIn 2001, bioleaching constituted approximately 10% of Chilean copper production and heap and dump leaching, in general, constituted approximately 30% o
Lecture 5 Reactor Bioleaching And Developments In Bioleaching Of Concentrates NPTEL Web Course 2 Course Title Metals Biotechnology Course Co ordinator Prof. K. A. Natarajan, IISc Bangalore Bioleaching of base metal concentrates A number of companies have developed biooxidation processes for use in metal extraction.
The dissolved copper concentration in the medium of bioleaching step 5 strongly increased until day 4 and only increased slightly in the following days to about 14440 mg/L Cu after 10 days (Figure 3A).Similar kinetics were observed for iron dissolution with a maximum of 4180 mg/L Fe on day 4 of the bioleaching.
Read quot;Differential bioleaching of copper by mesophilic and moderately thermophilic acidophilic consortium enriched from same copper mine water sample, Bioresource Technologyquot; on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Xinhai provides optimized solutions for your mine, one-stop service for mineral processing plant, include sample test, mine design, equipment manufacture, etc.
Address:No. 188, Xinhai Street, Fushan high-tech industrial development district, Yantai, Shandong, China
© 2017 Shandong Xinhai Mining Technology & Equipment Inc.