Development of a Strategy for Selective Metal Recovery from Pregnant Leach Solutions of Kupferschiefer Bioleaching

2015 ◽  
Vol 1130 ◽  
pp. 255-258 ◽  
Author(s):  
Sabrina Hedrich ◽  
Axel Schippers ◽  
D. Barrie Johnson
Keyword(s):  
Ferric Iron ◽  
Low Ph ◽  
Metal Recovery ◽  
Novel Technique ◽  
Ph Values ◽  
Sulfate Removal ◽  
Iron Copper ◽  
Valuable Metals ◽  
Copper Zinc ◽  
High Concentrations

Pregnant leach solutions (PLS) resulting from bioleaching of copper concentrate from Kupferschiefer are characterized by low pH values and high concentrations of mainly ferric iron, copper, zinc and sulfate, as well as significant amounts of nickel and cobalt. In order to recover the valuable metals for further processing, a novel technique that promotes selective metal recovery and sulfate removal from acidic liquors, described in this study, is proposed.

Selective Chemical and Biological Metal Recovery from Cu-Rich Bioleaching Solutions

2017 ◽  
Vol 262 ◽  
pp. 107-112 ◽  
Author(s):  
Sabrina Hedrich ◽  
René Kermer ◽  
Tim Aubel ◽  
Mirko Martin ◽  
Axel Schippers ◽  
...  
Keyword(s):  
Low Ph ◽  
Metal Recovery ◽  
Process Scheme ◽  
Chemical Methods ◽  
Copper Concentrate ◽  
Sulfate Removal ◽  
Valuable Metals ◽  
Selective Chemical ◽  
High Concentrations

Pregnant leach solutions (PLS) resulting from bioleaching of copper concentrate from Kupferschiefer are characterized by low pH and high concentrations of Fe, Cu, Zn as well as significant amounts of Ni and Co. In order to recover the valuable metals for further processing, chemical methods and a novel biological-induced technique that promotes selective metal recovery and sulfate removal from acidic liquors were applied and a process scheme was developed.

Improvement in Metal Recovery from Laterite Tailings by Bioleaching

2009 ◽  
Vol 71-73 ◽  
pp. 489-492 ◽  
Author(s):  
Ianeya Hernández Díaz ◽  
Federico Galizia ◽  
Orquidea Coto ◽  
Edgardo R. Donati
Keyword(s):  
Sulphuric Acid ◽  
Bacterial Growth ◽  
Low Ph ◽  
Metal Recovery ◽  
Pulp Density ◽  
Acidithiobacillus Thiooxidans ◽  
Ph Values ◽  
Technology Process ◽  
High Nickel

In previous studies it has been showed that sulphuric bio-acid is a good leaching agent for laterite tailings. In this work we evaluated nickel and cobalt recoveries from tailings of Caron technology process using sulphuric acid produced by Acidithiobacillus thiooxidans cultures under different conditions. In studies where tailings were initially added to the cultures, high nickel and cobalt recoveries (about 60 % for cobalt and 85-100 % for nickel) were reached after 13 days when low pulp densities (1 % and 2.5 %) of laterite tailings were used. These high recoveries fitted very well with the low pH values measured in these cultures. However, metal recoveries were negligible when higher pulp densities were used. Due to such reason, the performance of pre-cultivation configuration was evaluated; for that laterite tailings were added to the cultures after 24 or 48 hours of bacterial growth. This configuration was very efficient even at high pulp density (like 10 %) reaching recoveries (almost 50 % for cobalt and 80 % for nickel) close to those observed where tailings at low pulp densities were initially added to the cultures.

Enrichment and isolation of acid-tolerant sulfate-reducing microorganisms in the anoxic, acidic hot spring sediments from Copahue volcano, Argentina

2019 ◽  
Vol 95 (12) ◽  
Author(s):  
Graciana Willis ◽  
Ivan Nancucheo ◽  
Sabrina Hedrich ◽  
Alejandra Giaveno ◽  
Edgardo Donati ◽  
...  
Keyword(s):  
Ferric Iron ◽  
Hot Spring ◽  
Low Ph ◽  
Acidophilic Microorganisms ◽  
Sulfate Reducing ◽  
Ph Values ◽  
Organic Electron ◽  
Acid Tolerant ◽  
Biotechnological Processes ◽  
Iron Precipitates

ABSTRACT The geothermal Copahue-Caviahue (GCC) system (Argentina) is an extreme acidic environment, dominated by the activity of Copahue volcano. Environments characterised by low pH values, such as volcanic areas, are of particular interest for the search of acidophilic microorganisms with application in biotechnological processes. In this work, sulfate-reducing microorganisms were investigated in geothermal acidic, anaerobic zones from GCC system. Sediment samples from Agua del Limón (AL1), Las Máquinas (LMa2), Las Maquinitas (LMi) and Baño 9 (B9–2, B9–3) were found to be acidic (pH values 2.1–3.0) to moderate acidic (5.1–5.2), containing small total organic carbon values, and ferric iron precipitates. The organic electron donor added to the enrichment was completely oxidised to CO2. Bacteria related to ‘Desulfobacillus acidavidus’ strain CL4 were found to be dominant (67–83% of the total number of clones) in the enrichment cultures, and their presence was confirmed by their isolation on overlay plates. Other bacteria were also detected with lower abundance (6–20% of the total number of clones), with representatives of the genera Acidithiobacillus, Sulfobacillus, Alicyclobacillus and Athalassotoga/Mesoaciditoga. These enrichment and isolates found at low pH confirm the presence of anaerobic activities in the acidic sediments from the geothermal Copahue-Caviahue system.

scholarly journals Adaptation of Lactobacillus plantarum IMDO 130201, a Wheat Sourdough Isolate, to Growth in Wheat Sourdough Simulation Medium at Different pH Values through Differential Gene Expression

2011 ◽  
Vol 77 (10) ◽  
pp. 3406-3412 ◽  
Author(s):  
Gino Vrancken ◽  
Luc De Vuyst ◽  
Tom Rimaux ◽  
Joke Allemeersch ◽  
Stefan Weckx
Keyword(s):  
Gene Expression ◽  
Lactobacillus Plantarum ◽  
Differential Gene Expression ◽  
Lipoteichoic Acid ◽  
Low Ph ◽  
Exponential Growth Phase ◽  
Cellular Mechanisms ◽  
Content Type ◽  
Ph Values ◽  
Differential Gene

ABSTRACTSourdough is a very competitive and challenging environment for microorganisms. Usually, a stable microbiota composed of lactic acid bacteria (LAB) and yeasts dominates this ecosystem. Although sourdough is rich in carbohydrates, thus providing an ideal environment for microorganisms to grow, its low pH presents a particular challenge. The nature of the adaptation to this low pH was investigated forLactobacillus plantarumIMDO 130201, an isolate from a laboratory wheat sourdough fermentation. Batch fermentations were carried out in wheat sourdough simulation medium, and total RNA was isolated from mid-exponential-growth-phase cultures, followed by differential gene expression analysis using a LAB functional gene microarray. At low pH values, an increased expression of genes involved in peptide and amino acid metabolism was found as well as that of genes involved in plantaricin production and lipoteichoic acid biosynthesis. The results highlight cellular mechanisms that allowL. plantarumto function at a low environmental pH.

scholarly journals Mechanism of Coagulation of Humic Acid in Presence of Metal Ion Coagulants at Low pH Values

1970 ◽  
Vol 73 (5) ◽  
pp. 874-878 ◽  
Author(s):  
Takao YOTSUYANAGI ◽  
Katsumi GOTO ◽  
Masaichi NAGAYAMA
Keyword(s):  
Humic Acid ◽  
Metal Ion ◽  
Low Ph ◽  
Ph Values

Synthesis of chelated compounds of amino acids with metals

2021 ◽  
Author(s):  
A.A. Yamskikh ◽  
L.A. Ivanova
Keyword(s):  
Amino Acids ◽  
Physicochemical Properties ◽  
Alkaline Earth ◽  
Alkaline Earth Metals ◽  
Iron Copper ◽  
Copper Zinc ◽  
Glycine Synthesis

The article describes the reactions of glycine synthesis with alkaline, alkaline-earth and divalent 3-d metals, which were carried out during the experiment. Hydroxides or sulfates of lithium, magnesium, calcium, manganese, iron, copper, zinc, cobalt and sodium were used as reagents for the synthesis. The physicochemical properties of the obtained compounds were studied. Keywords: chelates, glycinates of alkaline and alkaline earth metals, glycinates of divalent 3-d metals.

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