scholarly journals Visualization of Rare Metal-Enriched Zones in Waste Landfills Using Induced Polarization Method

Environments ◽  
2020 ◽  
Vol 7 (11) ◽  
pp. 95
Author(s):  
Kazuhiro Hidari ◽  
Masato Miyata ◽  
Sojiro Yamazaki ◽  
Kazuo Kamura
Keyword(s):  
Iron Sulfide ◽  
Rare Metal ◽  
Extraction Methods ◽  
Induced Polarization ◽  
Metal Extraction ◽  
Disposal Site ◽  
Investigation Methods ◽  
Metal Contents ◽  
Nondestructive Investigation ◽  
Exploration Area

We consider the studied landfill site an urban mine and developed a series of projects on metal endowment forms, nondestructive investigation methods for metal-enriched zones, metal extraction methods from enriched zones, and useful metal selection methods. This paper examines the exploration method. Induced polarization (IP) exploration was carried out at a T disposal site filled in the studied valley. In addition, three drillings were conducted in the studied exploration area. Using the core samples, IP parameters and metal contents were measured. Then, by comparing these data, we examined the effectiveness of the IP method for the visualization of metal-enriched zones in unsaturated landfills. The results of this experiment revealed that the iron-sulfide-enriched zone in the valley filling landfill can be identified by IP exploration. In addition, we clarified the types and contents of rare metals that coexist in iron sulfide. This process allows for further evaluation of landfills as a deposit.

scholarly journals A new approach to biomining: Bioengineering surfaces for metal recovery from aqueous solutions

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Jesica Urbina ◽  
Advait Patil ◽  
Kosuke Fujishima ◽  
Ivan G. Paulino-Lima ◽  
Chad Saltikov ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Metal Binding ◽  
Raw Materials ◽  
Extraction Methods ◽  
Metal Recovery ◽  
Consumer Electronics ◽  
Metal Extraction ◽  
Copper Binding ◽  
Metal Binding Peptides ◽  
Binding Peptides

Abstract Electronics waste production has been fueled by economic growth and the demand for faster, more efficient consumer electronics. The glass and metals in end-of-life electronics components can be reused or recycled; however, conventional extraction methods rely on energy-intensive processes that are inefficient when applied to recycling e-waste that contains mixed materials and small amounts of metals. To make e-waste recycling economically viable and competitive with obtaining raw materials, recovery methods that lower the cost of metal reclamation and minimize environmental impact need to be developed. Microbial surface adsorption can aid in metal recovery with lower costs and energy requirements than traditional metal-extraction approaches. We introduce a novel method for metal recovery by utilizing metal-binding peptides to functionalize fungal mycelia and enhance metal recovery from aqueous solutions such as those found in bioremediation or biomining processes. Using copper-binding as a proof-of-concept, we compared binding parameters between natural motifs and those derived in silico, and found comparable binding affinity and specificity for Cu. We then combined metal-binding peptides with chitin-binding domains to functionalize a mycelium-based filter to enhance metal recovery from a Cu-rich solution. This finding suggests that engineered peptides could be used to functionalize biological surfaces to recover metals of economic interest and allow for metal recovery from metal-rich effluent with a low environmental footprint, at ambient temperatures, and under circumneutral pH.

scholarly journals Spectral induced polarization and electrodic potential monitoring of microbially mediated iron sulfide transformations

2008 ◽  
Vol 113 (G2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yves Robert Personna ◽  
Dimitrios Ntarlagiannis ◽  
Lee Slater ◽  
Nathan Yee ◽  
Michael O'Brien ◽  
...  
Keyword(s):  
Iron Sulfide ◽  
Induced Polarization ◽  
Spectral Induced Polarization ◽  
Potential Monitoring

scholarly journals Development of methods for analytical determination and extraction of cobalt(II) ions from aqueous solutions by melting organic reagents

2020 ◽  
Vol 130 (1) ◽  
pp. 48-53
Author(s):  
А.Sh. Kulankadir ◽  
◽  
S.S. Dosmagambetova ◽  
K.S. Tosmaganbetova ◽  
◽  
...  
Keyword(s):  
Rare Metal ◽  
Extraction Methods ◽  
Analytical Determination ◽  
Nuclear Materials ◽  
Standard Samples ◽  
Organic Reagents ◽  
Physicochemical Basis ◽  
Nickel Ores ◽  
Pure Substances ◽  
Toxic Organic Solvents

Cobalt is a relatively rare metal, and its rich deposits are now almost exhausted. The main sources of industrial production of metallic cobalt are copper-nickel ores containing cobalt as an impurity. The processing of these ores is very complex and involves pyro- and hydrometallurgical methods depending on the composition of the ore. The result is a solution of cobalt and nickel chlorides containing impurities of copper(II), lead(II), bismuth(III) ions. Extraction is increasingly used to purify cobalt from associated impurities. Extraction methods are widely used in hydrometallurgy, the nuclear materials industry, the technology of rare metals and the production of highly pure substances, as well as in analytical chemistry. However, despite this they have a number of drawbacks the main one is the use of fire hazardous and toxic organic solvents; therefore, the principles of eliminating toxic components from the process are becoming more common. The physicochemical basis of the extraction of cobalt (II) ions was studied by a stearic acid melt.The possibilities of practical application are considered of research results. Solid extracts of cobalt(II) were obtained with low-melting organic extractants. They meet all the requirements of standard samples: they differ in homogeneity of distribution, in similarity of composition with the analyzed samples and they can be used for several years.

scholarly journals Stream Sediments Geochemical Exploration in Wadi El Reddah area, Northeastern Desert, Egypt

2020 ◽  
Vol 10 (8) ◽  
pp. 809
Author(s):  
Hamed Ibrahim Mira ◽  
Hussein Kamal Hussein ◽  
Sameh Zakaria Tawfik ◽  
Neveen Salah Abed
Keyword(s):  
Correlation Coefficient ◽  
Sedimentary Rocks ◽  
Alkali Feldspar ◽  
Rare Metal ◽  
Stream Sediments ◽  
Strong Positive Correlation ◽  
Geochemical Exploration ◽  
Metal Contents ◽  
Positive Correlation Coefficient ◽  
The Relationship

<p>Wadi El Reddah representing a semi-closed basin, extends in the N-S direction. It has only one outlet at the northern tip while the wadi collects floodwater from internal tributaries along wall rocks. The present study discusses the relationship between geology and geochemistry data to detect anomalous radioactive locations. The geochemical maps show the mineralization areas with abnormal rare metal contents. This led to two uranium occurrences (GXXIII and GXXIV) at Gabal Gattar in the perthitic leucogranite. At Wadi El Reddah, high contents of pathfinder elements (REE, Y, Zn, Nb and As) were discovered at the southern and eastern boundaries. This may be attributed to the presence of alkali feldspar granite at Gabal Gattar at the upstream of Wadi El Reddah and also to the sharp contact between Gabal Gattar and Hammamat Sedimentary rocks. A strong positive correlation coefficient between Fe<sub>2</sub>O<sup>t</sup> and or Al<sub>2</sub>O<sub>3</sub> with Zr, Hf, Nb, Ta, REE, U, Rb, and Th reflects their association with thematization processes.</p>

Reprocessing potential of pegmatite tailings for rare metal extraction and brick fabrication, Uis, Namibia

2021 ◽  
Author(s):  
S. Lohmeier ◽  
B.G. Lottermoser ◽  
T. Schirmer ◽  
W. Fuchsloch
Keyword(s):  
Clay Mineral ◽  
Mineralogical Composition ◽  
Rare Metal ◽  
Local Economy ◽  
Source Rocks ◽  
Metal Extraction ◽  
Rare Metals ◽  
Fine Grained ◽  
Fired Bricks ◽  
Tailings Impoundments

Abstract Historic tin mining and mineral processing of the Uis pegmatite deposit (Namibia) has resulted in a series of tailings impoundments. In this study, Uis tailings were characterised to establish their suitability for brick manufacturing and reprocessing potential for rare metals (Be, Li, Nb, Ta). Tailings occur on-site as two distinct types (a) fine- to medium-grained sand (d50 = 120 to 420 μm) in dune-like spoil dumps; and (b) fine- to medium-grained sand (Fraction A: d50 = 120 to 410 μm; ~25% of tailings type) and fine-grained silt (Fraction B: d50 = 18 to 83 μm; ~75% of tailings type) in four low-lying dried-out waste impoundment cells. The two tailings types have a similar and homogeneous mineralogical composition, comprising quartz, plagioclase, K-feldspar and mica as well as minor cassiterite, columbite-tantalite and petalite, reflecting the micaceous quartzo-feldspathic composition of the source rocks. The main clay mineral is illite with minor (ferroan) clinochlore, cookeite and kaolinite. Such a mineralogical composition allows contemporary brick fabrication due to illite as the main clay mineral, a large proportion of quartz as a stabilizer and only trace amounts of minerals that could have a detrimental effect (e.g. Fe oxides and pyrite). Consequently, the consistent particle size distribution and homogeneous mineralogical composition allow present-day production of high-quality fired bricks from tailings. To date, the use of Uis tailings for brick manufacturing supports the local economy, aids building development and removes silica-rich mine wastes prone to dust dispersion in a remote part of Namibia. In addition, geochemical analysis of the tailings reveals strongly elevated mean concentrations of rare metals (~2 760 mg/kg Li, ~140 mg/kg Be, ~41 mg/kg Ta, ~55 mg/kg Sn, ~74 mg/kg Nb). Resource estimates suggest the presence of ~25 200 t Li2O, ~1 600 t BeO and significant Nb-Ta-Sn in impoundment cell material and a total resource of ~365 000 t Li2O and ~27 900 t BeO in bulk tailings. Thus, Uis tailings also offer the opportunity for reprocessing and extraction of rare metals.

scholarly journals SPESIASI DAN BIOAVAILABILITAS Pb DAN Cu DALAM TANAH PERTANIAN ORGANIK DI BEDUGUL SERTA KANDUNGAN LOGAM TOTALNYA DALAM SAYUR BROKOLI

Jurnal Kimia ◽  
2019 ◽  
pp. 145
Author(s):  
I M. Siaka ◽  
H. Nurcahyani ◽  
I B. P. Manuaba
Keyword(s):  
Sequential Extraction ◽  
Organic Agriculture ◽  
Organic Soil ◽  
Extraction Methods ◽  
Metal Extraction ◽  
Organic Soils ◽  
Organic Farm ◽  
Wet Digestion ◽  
Agriculture Soil ◽  
Before And After

Bedugul area is a vegetable producing center in Bali that also develops organic farming. This study aimed to determine the bioavailability of Pb and Cu in an organic farm in Bedugul and the content of both metals in broccoli before planting and at harvest. Metal extraction was carried out through wet digestion and its bioavailability was determined by the application of the sequential extraction methods. The measurement of the two metals was accomplished by using AAS. The total Pb content in the organic soils before and after harvesting were found to be 746.102-897.3754 mg/kg and 277.778-328.88217 mg/kg, while Cu were of  93.1212-11-114.3259 mg/kg, and 48,608-92.3708 mg/kg, respectively. The bioavailability of Pb and Cu in soils before planting was different from that of at harvest. Pb metal in organic soil before planting which were readily bioavailable, bioavailable, and nonbioavailable were were found to be (17.80-21.62)%, (44.07-47.65)%, and (30.73-36, 89 )%, while Cu were of (5.02-7.89)%, (55.73-60.57)%, and (32.81-39.25)%, respectively. The total Pb and Cu contents in broccoli were of (27,2968-30,3621) mg/kg and (27,0303-30,0223) mg/kg, respectively. Keywords: bioavailability, broccoli, organic agriculture soil, Pb and Cu, speciation

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