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Bio-Heap Leaching of Primary Copper Sulfide Ore by JOGMEC ...

JOGMEC has been carrying out the study on primary copper sulfide ores leaching for recovering copper economically and efficiently by heap leaching. In our study, we have been using the primary copper sulfide ore produced in an IOCG deposit. The ore is characterized by high iron content and high acid consumption in leaching. For the optimization of the leaching, the …

Biorecovery of copper from converter slags: Slags ...

Abstract This paper studies the ferric sulphate leaching of converter slag (9% Cu) in order to recover Cu through a process in which bacteria regenerate the leaching agent. For this purpose, the effect of variables such as pulp density, ferric concentration, temperature and size particle have been investigated. As the Cu extraction is limited by the physical refractoriness of slag, a …

Influence of Ferric and Ferrous Iron on Chemical and ...

Ahmadi, A. (2012) Influence of Ferric and Ferrous Iron on Chemical and Bacterial Leaching of Copper Flotation Concentrates. International Journal of Nonferrous Metallurgy, 1, 42-48. doi: 10.4236/ijnm.2012.13006.

Advances in high-temperature heap leaching of refractory ...

The heap leaching of copper ores is an example of such a trend, where heap leaching ... ISSN 2225-6253. This paper was first presented at the Percolation Leaching Conference, 8–9 November 2011, Misty Hills, Muldersdrift. ... When designing a bacterial heap leach process for sulphide ores, the rate and schedule of air delivery to the ...

COPPER BIOLEACHING | Wang Leiming | 1 updates | 6 ...

The highest bacteria concentration reached 9.54 × 107 cells·mL-1 with an increase by 69.15%. And a maximum of 95.32% copper leaching rate with a …

Minerals | Free Full-Text | Copper Bioleaching in China ...

The commercial application of copper bioleaching, an environmentally-friendly approach for low-grade and secondary mineral resources recycling, has increased worldwide since the 2000s. As the world's second-largest economic entity and the largest developing country, China has the largest demand for metal resources, significantly advancing the theory and industrial …

Bacterial and chemical leaching of copper-containing ores ...

Jan 25, 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 …

Bacterial and chemical leaching pattern on copper ores of ...

Pluskota, B. 1975 The copper ore bacterial leaching. Cuprum 1, 28–34. Google Scholar Rodriguez-Leiva, M. & Tributsch, H. 1988 Morphology of bacterial leaching patterns by Thiobacillus ferrooxidans on synthetic pyrite. Archives of …

The Method of Extracting Copper and Gold by Bacterial ...

Some mines make use of bacterial leaching as a means of extracting copper from low-grade ore and tailings from conventional mining. The bacteria thiobacillus ferro-oxidants and thiobacillus thio-oxidants get the energy they need to survive by oxidising Fe2+ ions and S2- ions. The S2- ions are present in insoluble copper minerals, zinc and lead.

Copper Mining Using Acidothiobacillus - microbewiki

Jul 23, 2011· Afterward, the dissolved copper ions are transformed to solid copper metal through a process called electrowinning that uses an electric current to reduce the dissolved metal and deposit it onto a cathode, at which point the solid elemental copper metal can be employed for its many uses (Siddiqui et al. 2009). Mechanism of Bacterial Leaching

A BACTERIAL HEAP LEACHING APPROACH FOR THE …

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 ...

(PDF) Bioleaching: A microbial process of metal recovery ...

The composition of bacterial populations in copper bioleaching systems was investigated by analysis of DNA obtained either directly from ores or leaching solutions or …

Microbiological leaching of copper from lead mattes ...

The possibility of recovering copper from lead blast furnace mattes by bioleaching, using bacteria of the genus Thiobacillus ferrooxidans, has been studied. In this paper, the influence of certain variables on the dissolution rate and the adaptation period of the bacteria have been evaluated, including energy source, nutrient, type of matte, type of stirring, pulp density, and …

Bacterial heap-leaching: Practice in Zijinshan copper mine ...

Sep 01, 2006· This paper describes metallurgical studies and pilot plant tests for Zijinshan Copper ore. A brief introduction to the mineralogy, bacterial culture, shake flask tests and column tests on bioleaching is presented. The performance of bio-heap leaching and SX–EW, acid and iron balance, operational cost of the pilot plant are discussed.

COPPER HEAP LEACHING - linkedin.com

The objectives of any copper heap bacterial leaching should encompass the following main points: 1) Characterise ore for particle size, elemental composition, mineralogy, acid …

LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY …

extraction of copper from the leach solution. This paper describes the influence of acid concentration and influence of solid/liquid ratio on copper leaching rate from the ore bodies Cerovo-Cementacija 2 (C2). 2. Experimental 2.1. Material The leaching experiments were conducted using two representative ore samples taken

The role of surface copper content on biofilm formation by ...

Oct 09, 2019· All the copper materials showed positive results on the control of single and dual species biofilms presenting high reductions of bacterial culturability > 4 log CFU per cm 2. The antimicrobial action of the selected materials seem not to be related to copper leaching or to the formation of reactive oxygen species.

Bacterial heap-leaching: Practice in Zijinshan copper mine ...

The Zijinshan copper mine is the largest secondary copper sulphide mine in China. It has an ore reserve of more than 400 million tonnes with an average copper grade of …

HEAP LEACHING Technology options and innovation for …

The heap leaching of sulfide ores, including chalcopyrite, via enhanced bacterial leaching is discussed. INTRODUCTION Over the last twenty years production of extremely pure copper from solvent extraction and electrowinning (SX/ EW) has become more common in a market of real declining prices for copper metal. This paper touches on a

Bacterial leaching of ores and other materials

In the U.S.A. 200,000 to 250,000 t of copper are produced annually by bacterial leaching, equivalent to 20 -25% of the total copper production. In the whole world about 5% of the total copper production is obtained by bacterial leaching. Bacterial leaching is a very slow process.

Microbial leaching - Online Biology Notes

Aug 27, 2020· Copper leaching plants have been in wide use throughout the world for many years, generally operated as simple heap leaching processes but sometimes as combinations of heap and in-situ leaching. The leaching solution (sulfate/Fe 3+ solution) carries the microbial nutrients in and the dissolved copper out.

Microbial leaching of metals from sulfide minerals ...

Copper, zinc, gold, etc. can be recovered from sulfide ores by microbial leaching. Mineral solubilization is achieved both by 'direct (contact) leaching' by bacteria and by 'indirect leaching' by ferric iron (Fe 3+ ) that is regenerated from ferrous iron (Fe 2+ ) by bacterial oxidation.

PAPER OPEN ACCESS Effect of carbonaceous matter on …

May 03, 2020· and copper leaching percent in WPCBs leached by bacteria. In the presence of different concentrations of humic acid, the leaching behavior of WPCBs by mixed acidophilic bacteria HQ0211 is shown in Fig. 2a-d, respectively. Fig. 2d shows that the copper leaching percent were 76.07%, 87.15%, 84.86% and

(PDF) A model for the bacterial leaching of copper sulfide ...

A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER. A model for the bacterial leaching of copper sulfide ores in pilot-scale columns. Download. A model for the bacterial leaching of copper sulfide ores in pilot-scale columns. Jorge Castillo. Related Papers. A comprehensive model for copper sulphide heap leaching.

Characterization of Extreme Acidophile Bacteria ...

In order to improve copper leaching efficiency from the flexible printed circuit board (PCB) by Acidithiobacillus ferrooxidans, it is necessary to quantitatively measure the bacteria bioleaching copper under extreme acidic condition from flexible PCB. The inductively coupled plasma-atomic emission spectroscopy (ICP-AES) is a very accurate way to analyze metals in solution; this …

PAPER OPEN ACCESS Effects of Copper Solvent Extraction ...

Oct 11, 2019· bacteria growing in the contaminated medium, cell morphology changes, and cell membrane breaks [4]. This paper aims to study the effects of the lost organic substance on the metabolism of the leaching bacteria. It is hoped that the key problems of low efficiency of heap bioleaching will be interpreted

BACTERIAL LEACHING OF COPPER FROM LOW GRADE …

Bacterial leaching TABLE III Results of the laboratory trial in leaching out copper jroln a sample of cha/c.o .. pyrite ore available at Ingladhal . . .. The amount of the ore taken 40 los The size of the ore (CuFeSs containing O· 6 per cent eu) ! inch The volume of the leach liquor (pH 5), i.e. the medium without

Microbial succession during a heap bioleaching cycle of ...

The paper Bacterial succession in bioheap leaching (Brierley, 2001) showed the search for methods to analyze the microbial dynamics in bioleaching industrial processes as a key challenge for advancing commercial bioheap applications."Chemical and physical conditions within bioheaps change radically from the time the bioheap is stacked and inoculated until bioleaching is …

Copper leaching from waste electric cables by ...

coming from the chemistry and the real benefit of bacteria pres-ence. This paper focuses on the comparison of the chemical leach-ing and the indirect bacterial leaching in terms of leaching time and copper extraction. The objective is to evaluate the technical efficiency of both hydrometallurgical routes. Therefore at this

Recovery of copper by dump leaching with use of bacteria ...

In 1972 industry began using these ores for recovering copper by means of microbial leaching. The present paper discusses the results obtained during, the 18-year period of the industrial copper dump) leaching operation. The flowsheet is presented and each separate component of the complex production process is described.

Bioleaching of copper from waste printed circuit boards …

Feb 22, 2018· The toxicity of waste printed circuit boards (PCBs) to bacteria was considered as the major limitation in bioleaching of copper from PCBs. To reduce the toxicity of PCBs, copper extraction from PCBs was investigated using bacteria-free cultural supernatant from some metallurgical microbial consortium, whose predominant organisms were Leptospirillum …

(PDF) ENVIRONMENTAL BIOTECHNOLOGY Relationship between ...

37 Full PDFs related to this paper Read Paper ENVIRONMENTAL BIOTECHNOLOGY Relationship between bioleaching performance, bacterial community structure and mineralogy in the bioleaching of a copper concentrate in stirred-tank reactors

Microbial leaching of metals from sulfide minerals ...

Apr 01, 2001· Microbial leaching is an economical method for the recovery of metals from low-grade mineral ores. Two thousand years ago, microbial leaching of copper as copper sulfate from sulfide ores and recovery of metallic copper by 'cementation' was known both in Europe and China (Fossi, 1990): CuSO 4 +Fe 0 →Cu 0 +FeSO 4.

Environment Protection Engineering

The paper presents the results of laboratory tests of bacterial leaching of metals from electronic scrap. It describes the mechanisms of this process and the factors influencing the chemical reaction. The paper also presents preliminary results of experimental studies on the copper bioleaching from electronic waste with the

16.6A: Microbial Ore Leaching - Biology LibreTexts

Jan 03, 2021· The electrons pass into the cells and are used in biochemical processes to produce energy for the bacteria while reducing oxygen to water. The critical reaction is the oxidation of sulfide by ferric iron. The main role of the bacterial step is the regeneration of this reactant. Copper leaching has a very similar mechanism.

Study on Recovery of Associated Copper Oxide Ore by ...

bacteria is the control link of the whole bacterial leaching process. Bacterial leaching is sometimes dominated by direct action and sometimes by indirect action. However, in the process of leaching, both functions exist simultaneously and cannot be excluded. 3. Factors Affecting Bacterial Leaching of Associated Copper Oxide Ore

Bacterial Leaching of Kure Copper Ore | Request PDF

In this leaching process, using "Acidithiobacillus ferrooxidans" culture, bacteria count, pH, copper and iron recoveries are monitored during the …

Bioleaching of a Copper Sulphide Concentrate by Two ...

Jan 06, 2012· Results further showed minor dissolution of copper in chemical as well as bio-leaching, but there was some effect of bacterial oxidation on leaching of nickel and cobalt. 4.2. Bioleaching with shaking Bioleaching of concentrate (≤200 μm size) was carried out with shaking without additive (data not shown).

Innovations in Copper: Mining & Extraction: Producing ...

The bacteria, which were native to the soil, in effect created a completely natural metallurgical processing plant. Until recently, conventional acid-leaching of copper was utilized as a means of recovering copper from low-grade materials such as waste rock and flotation tailings and was conducted in dumps that were already in place.

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