Most of the recycling and recovery processes are mainly dependent on the source materials. Several physical, chemical and metallurgical recovery methods prevail in E-waste recycling, some of them are economically feasible and others are not [].Generally, bioleaching process has got diverse benefits over traditional chemical and physical extractive leaching …
Semantic Scholar extracted view of "Recent trends and challenges in bioleaching technologies" by P. Kumar et al. ... Bioleaching and chemical leaching as an integrated process in the zinc industry. Adelson Dias de Souza P. Pina V. Leão. Environmental Science, …
The zinc extraction was 3.7-fold higher in the bioleaching compared to chemical leaching. The leaching rate of the sphalerite concentrate tended to decrease with decreasing pH from 1.8 to 1.2. ... Bioleaching and chemical leaching as an integrated process in the zinc industry. Miner. Eng., 591–599 (2007) Google Scholar. Deveci et al., 2004. H ...
Traditional hydrometallurgical processes, such as thermal and chemical leaching, allow the quick treatment and full annihilation of hazardous organic components in fly ash. ... Hence, this integrated bioleaching …
The results suggested that the integrated bioleaching-chemical oxidation process is an effective method for the complete leaching of valuable metals from the coked spent catalyst. SEM-EDX of spent ...
This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% Zn, 1.9% Pb, 31.8% S and 9.0% Fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the bioleaching residue were assessed.
Change in pH during bioleaching and chemical leaching is shown in Fig. 2 for 0 wt% (a), 30 wt% (b) pyrite addition. The pH of the solution was changed to initial pH by adding H 2 SO 4 and NaOH every day. In terms of bioleaching, it was seen increase in pH during chemical leaching (lag phase) for the both samples without mechanical activation ...
Hybrid bioleaching. Chemical leaching as the most preferred method for metal recovery is fast and efficient yet has its environmental concerns. The environmental issues of the chemical leaching agents lead to the utilization of expensive leaching materials that are not affordable (Pandey and Natarajan, 2015; Pant et al., 2012).
Bioleaching is a boom for metal recovery from metallurgical waste. •. Impact of mineral biochemistry on process performance is given. •. Role of OMICS and synthetic biology …
This review paper explores the potential of bioleaching as a sustainable alternative for recovering metals from solid matrices. With over 12 billion tons of solid waste annually worldwide, bioleaching provides a promising opportunity to extract metals from solid waste, avoiding harmful chemical processes. It explains bacterial and fungal bioleaching …
The results suggested that the integrated bioleaching-chemical oxidation process is an efective method for the complete leaching of valuable metals from the coked spent catalyst. Keywords …
The composition of bacterial populations in copper bioleaching systems was investigated by analysis of DNA obtained either directly from ores or leaching solutions or after laboratory cultures.
Recovery of rare earth elements from coal fly ash by integrated physical separation and acid leaching. Author links open overlay panel Jinhe Pan a b, Tiancheng Nie a, Behzad Vaziri Hassas b, ... Metal removal from Municipal Solid Waste Incineration fly ash: a comparison between chemical leaching and bioleaching. Waste Manag., 60 (2017), pp. 397 ...
the potential of an integrated bioleaching-chemical oxida-tion process for the improved leaching of valuable metals from spent hydroprocessing catalysts (coked and decoked). Bioleaching was conducted using sulfur-oxidizing micro-organisms with spent atmospheric residue desulfurization (ARDS) catalyst. The present study results will likely be
Introduction The application of bioleaching of metal sulfides (MS) and its understanding have evolved over the last decades. The mobilization of metal cations from often almost insoluble minerals in ores by biological acidification, oxidation, and complexation processes is referred to as bioleaching, and its application is termed biomining, being now a …
About 5% of the world copper production is obtained through bioleaching. iii. Uranium Leaching: In the uranium leaching process, insoluble tetravalent uranium is oxidized with a hot H 2 SO 4 /Fe 3+ solution to soluble hexavalent uranium sulfate. UO 2 + Fe 2 (SO 4) 3 → UO 2 SO 4 + 2FeSO. Uranium bioleaching process is more significant ...
Key Terms. ore leaching: The process of recovering metals from ores by using a number of different techniques.; Microbial ore leaching (bioleaching) is the process of extracting metals from ores with the use of microorganisms. This method is used to recover many different precious metals like copper, lead, zinc, gold, silver, and nickel.
Bioleaching has several advantages compared to conventional hydrometallurgy (the leaching of metals with acids or bases) or pyrometallurgy (the leaching of metals using thermal treatment), which have high energy requirements, require a large amount of chemicals, and also produce high levels of environmental pollution (Zeng et al., 2013).
The recovery of copper from secondary waste resources (e.g. electronic wastes, slag, fly-ash, sludge and spent catalysts) via oxidative and reductive bioleaching becomes a running trend and a potential alternative to limited metal supply. The motive of this review is to ponder over recycling of secondary waste towards the circular economy to reduce …
Integrated acid leaching and biological sulfate reduction of phosphogypsum for REE recovery ..., Bashlykova et al. (2012) presented results from the use of acidophilic thiobacteria (VUR-9) in an aerated tank for bioleaching of PG, reporting a yield of 55–70% ... Sulfuric acid was selected as the leaching chemical due to the compatibility of ...
that is holistic and integrated in order to improve resource use in. ... Chemical leaching took shorter than bioleaching, but the leaching yield was lower, i.e. 41% for 4 h from Ghent samples, 44 ...
Methodology: In this study, bioleaching integrated with an electrokinetic approach for heavy metal remediation from MSW incineration fly ash using Acidithiobacillus ferrooxidans and ...
The bacterial leaching of zinc and iron from solid wastes at the Isdemir iron and steel plant has been investigated using Acidithiobacillus ferrooxidans as the bacterial agent. The effects of a range of operational parameters, including particle size, solids concentration and pH, on the efficiency of the bioleaching process were investigated. In each test, several variables …
1. Introduction. Bioleaching refers to the extraction of metals from insoluble ores/secondary wastes by the activity of leaching microorganisms (Mishra et al., 2005).Owing to its low cost, simple operation, mild reaction and environment-friendly advantages, bioleaching has been used widely to solubilize/extract various metals, such as copper, zinc, uranium, …
Severe corrosion of 316 L SS was caused by Acidithiobacillus ferrooxidans in an extremely acidic bioleaching condition. The corrosion current density (i corr) increased from 118 ± 10 nA cm −2 in sterile M882 medium to 575 ± 63 nA cm −2 in A. ferrooxidans broth.Leaching of pyrite further accelerated the corrosion of A. ferrooxidans and the i corr reached 2.55 ± 0.21 …
Chemical leaching is rapid and efficient but causes secondary pollution. Bioleaching is a promising approach, eco-friendly and economically feasible, but it is slower process. This review considers the recycling potential of microbes and suggests an integrated bioleaching approach for Cu extraction and recovery from WPCBs.
The motivation for the study was to cut down the cost involved in oxygen consumption due to suppression of sulfur oxidation and activating iron oxidation activity. This …
A novel sequential process of bioleaching and chemical leaching for dissolving Ni, V, and Mo from spent petroleum refinery catalyst. Hydrometallurgy (2013) ... Several two-stage sequential integrated bioleaching processes were evaluated to verify the effectiveness of recovering vanadium and nickel from spent refining catalysts. The experimental ...
This study is aimed to review existing processes to produce zinc metal and evaluate parameters of bio and direct leaching of zinc sulfide concentrates. The experiments, …
Abstract Bioleaching of metal sulfides is performed by diverse microorganisms. The dissolution of metal sulfides occurs via two chemical pathways, either the thiosulfate or the polysulfide pathway. These are determined by the metal sulfides' mineralogy and their acid solubility. The microbial cell enables metal sulfide dissolution via oxidation of iron(II) ions and …
• Leaching of metal sulfides is strongly enhanced by microorganisms. • Biofilm formation and extracellular polymer production influences bioleaching. • Cell interactions in …
This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% …
This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% …
In a similar study by Dolker and Pant, an integrated chemical-biological process for metal recovery from a lithium-ion battery waste. The authors reported that lithium (25%) separation by bioleaching and cobalt (98%) by adsorption. ... Wu HY, Ting YP (2006) Metal extraction from municipal solid waste (MSW) incinerator fly ash—chemical ...
