Heap leaching - Wikipedia
The mined ore is usually crushed into small chunks and heaped on an impermeable stone or clay lined leach pad where it can be irrigated with a leach solution to dissolve the valuable metals. While sprinklers are occasionally used for irrigation, more often operations use drip irrigation to minimize evaporation, provide more uniform distribution of the leach solution, and avoid damaging the exposed mineral. The solution then percolates through the heap and leaches both the target and other minerals. This process, called the "leach cycle," generally takes from one or two months for simple oxide ores (e.g. mo…
A BACTERIAL HEAP LEACHING APPROACH FOR THE TREATMENT …
leaching and bacterial leaching. There are currently no heap leach operations processing primary (chalcopyrite) copper sulphides. 80% of world copper resources consists of low grade chalcopyrite, where the grade is too low to concentrate and which cannot be economically processed in any way other than heap leaching. Mintek is currently ...
Bacterial heap-leaching: Practice in Zijinshan …
01-09-2006 · Several modifications to the heap-leaching and the SX–EW process were made to improve the performance of the pilot plant. 80% copper recovery was achieved within 200 days by the year 2003. Currently, a plant with a capacity of 10,000 t Cu/a, the first commercial plant of bio-heap leaching in China, is scheduled to be started up at the Zijinshan Copper Mine by the end of 2005.
Bacterial heap-leaching: Practice in Zijinshan …
The setting up and operation of bacterial heap leaching to produce 300 to 10,000 t y − 1 of cathode copper in the Zijinshan copper mine in China has been discussed by Ruan et al. (2006).
Bacterial heap leaching of refractory gold/sulphide ores
It may well be economic, however, to use a bacterial pre-leach of crushed material to release the encapsulated gold and make it amenable to a standard alkaline cyanide heap-leaching process or to a heap-leaching process using alternative gold lixiviants.The GENMIN Group has being carrying out research on the bacterial heap leaching process for a number of years, and has successfully ...
Microbial Leaching (Bioleaching, Biomining ...
Direct Bacterial Leaching ... 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 the pile. The liquid coming out of the bottom of pile reach in mineral.
Bacterial Leaching – Core Group
> Bacterial Leaching Core has extensive experience in testwork relating to bacterially assisted leaching of base metal sulphide and refractory gold ores. Test programmes carried out have included use of a range of bioreactors for oxidation of concentrates and aerated columns for heap leach simulation studies.
Heap Leaching - an overview | ScienceDirect Topics
2.1 Leaching. Most copper leaching is done by piling broken ore (∼0.5% Cu) into flat-surface, 3–10m high, 10 4 –10 5 m 2 heaps of ore and then sprinkling dilute sulfuric acid lixiviant on to the heap surface. The lixiviant trickles down through the heap and leaches copper from its minerals to produce a pregnant leach solution containing 1–5kg Cum −3.
Bioleaching - Wikipedia
Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt
Bacterial Leaching - ias.ac.in
Bacterial leaching is the extraction of metals from their ores using microorganisms. ... Heap leaching requires the preparation of the ore, primarily size reduction, so as to maximise mineral-lixiviant interaction and the laying of an impermeable base to prevent
Bacterial leaching - Indian Academy of Sciences
Bacterial Leaching Biotechnology in the Mining Industry Preston Devasia and K A Natarajan Bacterial leaching is the extraction of metals from their ores using microorganisms. Microbial technology offers an eco- nomic alternative for the mining industry, at a time …
Bacterial Leaching - SGS
Bacterial leaching is an established method of treating refractory gold and base metal ores or concentrates. SGS Minerals Services has undertaken testing for numerous projects for flowsheet development and optimization including bench scale and pilot plant testing, and audits and troubleshooting at operating plants in South Africa, Brazil, Ghana,
bacterial heap leaching of refractory gold sulphide …
a bacterial heap leaching approach for the . Copper is primarily produced by smelting and refining (80% of worldwide production), followed by oxide heap leaching (13%), secondary copper sulphide heap leaching (5%), and other hydrometallurgical routes such as concentrate pressure leaching and bacterial leaching.
8 Microbial Leaching of Metals - Wiley-VCH
8 Microbial Leaching of Metals HELMUT BRANDL Zürich, Switzerland 1 Introduction 192 2 ... 4.2 Models of Leaching Mechanisms 194 4.3 Factors Influencing Bioleaching 197 4.4 Bacterial Attachment on Mineral Surfaces 200 5 Microbial Diversity in Bioleaching Environments 200 6 Case Studies of Bioleaching ... Heap leaching techniques were assumed to ...
Bioleaching - LinkedIn SlideShare
Indirect bacterial leaching in this process the microbes are not in direct contact with minerals, but leaching agents are produced by these microbes which oxidize the ores. 7. There are three commercial process used in bioleaching; a. Slope leaching b. Heap leaching c. In situ leaching 8.
Bioleaching of Copper | SpringerLink
Copper Sulfide Leach Solution Copper Recovery Heap Leach Bacterial Leaching These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
The progression of metallurgical testwork during heap ...
bacterial heap leaching of low-grade chalcopyrite ores and the acid heap leaching of nickel laterites. A complete programme of heap leach testwork typically involves a sequence of bottle roll tests and column tests, followed by piloting on test heaps. The initial testwork is aimed at determining the amenability of the ore to heap leaching,
How to Extract Gold with Microbial Heap Leaching? …
Heap leaching is a popular way to separate gold from ore. Gravity, flotation, amalgamation, cyaniding, resin in pulp, carbon plasma adsorption and dump leaching are commonly used in gold processing.
copper leaching bacterial - weill-gilles.fr
Bacterial extraction of metals is not a new technology as it has been in application for ore leaching for centuries though the mechanism remained unknown Specifically copper was recov- Preston Devasia is a senior lecturer at the Vellore Institute of Technology …
Bacterial leaching of ores and other materials
Bacterial leaching of ores and other materials R. Näveke, Institut für Mikrobiologie, Technische Universität Braunschweig, Fed. Rep. Germany : Summary In nature sulfidic ores are decayed by weathering under the influence of oxygen and water. Microbiological investigations reveal that certain bacteria are the main agent in this process.