scholarly journals Characterization of amalgamation tailings from ASGM in Sekotong area, West Nusa Tenggara, Indonesia, and its potential added value

2021 ◽  
Vol 882 (1) ◽  
pp. 012070
Author(s):  
A Wahyudi ◽  
W Surono ◽  
I Rodliyah ◽  
H E Mamby
Keyword(s):  
Particle Size ◽  
Gold Mining ◽  
Added Value ◽  
Small Scale ◽  
Gravity Concentration ◽  
Mineral Liberation ◽  
Liberation Analysis

Abstract Artisanal and small-scale gold mining (ASGM) in Indonesia still uses mercury in amalgamation process to extract gold form the ores. The process easily produces gold but at the same time produces very dangerous mercury waste. In this study, a comprehensive series of tests were carried out on amalgamation tailings from the ASGM in Sekotong area, West Nusa Tenggara. The tailings contain mercury up to 150 ppm, above the safe threshold, and gold up to 20 ppm which is intended to be recovered. Furthermore, mineral liberation analysis (MLA) and gravity recoverable gold (GRG) test were performed to determine the feasibility of recovering gold from the tailings. The liberation degree of the gold started from particle size of 37 \xm causes challenging to recover it. However, the GRG test confirmed that the gold was still feasible to be recovered by gravity concentration.

Characterization of a refractory arsenical silver ore by mineral liberation analysis (MLA) and diagnostic leaching

2019 ◽  
Vol 189 ◽  
pp. 105106 ◽  
Author(s):  
Oktay Celep ◽  
Ersin Y. Yazici ◽  
Pelin Altinkaya ◽  
Haci Deveci
Keyword(s):  
Mineral Liberation ◽  
Liberation Analysis

Process Mineralogy of Jinshan Gold Ore Based on Mineral Liberation Analysis System

2014 ◽  
Vol 1010-1012 ◽  
pp. 1613-1617
Author(s):  
Liu Lu Cai ◽  
Shuang Liu ◽  
Wen Juan Li ◽  
Cheng Ying Zhou ◽  
Wei Qu ◽  
...  
Keyword(s):  
Particle Size ◽  
Native Gold ◽  
Combined Process ◽  
Gold Ore ◽  
Mineral Liberation ◽  
Process Mineralogy ◽  
Liberation Analysis ◽  
Mineralogy Characteristic ◽  
Analysis System

Traditional measurement and modern SEM-based mineral liberation analysis (MLA) system were employed to obtain the process mineralogy characteristic of Jinshan gold ore which had high Au (6.20g/t) and low sulfide (0.25%). XBSE, XBSE_STD and SPL_Lt MLA modes are used in this case, which make the results timely, reliable and quantitative. The gold behaves irregular granular native gold or silver-bearing native gold of which the Au content ranging from 93%to 100%. Gold mainly occurred as liberated or in gold-carrying gangue minerals, such as quartz and biotite,rarely in pyrite in the form of fissure gold, inter-crystalline gold or inclusion gold . The particle size of the Gold minerals range from 0.001mm to 0.010mm , which is too fine to recover from beneficiating method. Combined process should be adopted.

scholarly journals Mineralogical Imaging for Characterization of the Per Geijer Apatite Iron Ores in the Kiruna District, Northern Sweden: A Comparative Study of Mineral Liberation Analysis and Raman Imaging

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 544 ◽  
Author(s):  
Patrick Krolop ◽  
Anne Jantschke ◽  
Sabine Gilbricht ◽  
Kari Niiranen ◽  
Thomas Seifert
Keyword(s):  
Raman Imaging ◽  
Northern Sweden ◽  
Quantitative Characterization ◽  
Advantages And Disadvantages ◽  
Mineral Liberation ◽  
Processing Strategies ◽  
Backscattered Electron ◽  
Liberation Analysis ◽  
Ore Types

The Per Geijer iron oxide apatite deposits are important potential future resources for Luossavaara-Kiirunavaara Aktiebolag (LKAB) which has been continuously mining magnetite/hematite ores in northern Sweden for over 125 years. Reliable and quantitative characterization of the mineralization is required as these ores inherit complex mineralogical and textural features. Scanning electron microscopy-based analyses software, such as mineral liberation analyzer (MLA) provide significant, time-efficient analyses. Similar elemental compositions of Fe-oxides and, therefore, almost identical backscattered electron (BSE) intensities complicate their discrimination. In this study, MLA and Raman imaging are compared to acquire mineralogical data for better characterization of magnetite and hematite-bearing ores. The different approaches demonstrate advantages and disadvantages in classification, imaging, discrimination of iron oxides, and time consumption of measurement and processing. The obtained precise mineralogical information improves the characterization of ore types and will benefit future processing strategies for this complex mineralization.

Cues to Greater Recycling Efficiency - Characterization of a Crushed Mobile Phone by Mineral Liberation Analysis (MLA)

2019 ◽  
Vol 959 ◽  
pp. 134-141 ◽  
Author(s):  
Dirk Sandmann ◽  
Hans Georg Jäckel ◽  
Jens Gutzmer
Keyword(s):  
Particle Size ◽  
Mobile Phone ◽  
Chemical Elements ◽  
Complex Mixture ◽  
Complex Composition ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Mineral Liberation ◽  
Measurement Mode ◽  
Liberation Analysis

In the year 2016 alone, more than 1.35 billion smartphones were manufactured globally. These smartphones contain up to 60 different chemical elements and the summarized metal weight of the 2016 production may have well exceeded 50,000 metric tons. At present, most elements contained in this very complex “mixture” represented by a smartphone have recycling rates well below 50%, and the recycling rates of rare earths, indium, tantalum or gallium are even below 1%. The major challenge of mobile phone recycling is the complex composition of the devices made of many individual components – and the lack of transparent information as to the composition of these components. This is aggravated by the fact that many elements occur in traces only and / or are located in highly complex material composites. To enable more effective recycling of mobile phones, it is thus imperative to characterize the constituent components, the presence of elements in it, as well as their behavior during comminution. In a pilot study, a Nokia mobile phone Model 5228 Type RM-625, crushed with a granulator UG300, was examined by Mineral Liberation Analysis. The analysis of three particle size fractions of the comminuted material was carried out in an automated measurement mode with a grid of energy-dispersive X-ray spectra. A total of 130 different phases were detected during this analysis. More than 100 of these phases occur at levels <1% by weight. This strongly illustrates the very complex composition of smartphones. A comparison of the modal content of the three particle size fractions showed good liberation of certain components and an enrichment of some components in specific fractions. These observations reveal the potential to successfully separate different technical components from one another with the goal to increase the resource efficiency of the recycling process.

Incorporation of micro/nanoparticles of PCL with essential oil of Cymbopogon nardus in bacterial cellulose

2018 ◽  
Vol 1 (2) ◽  
pp. 37
Author(s):  
Aline Krindges ◽  
Vanusca Dalosto Jahno ◽  
Fernando Morisso
Keyword(s):  
Particle Size ◽  
Particulate Matter ◽  
Essential Oil ◽  
Zeta Potential ◽  
Bacterial Cellulose ◽  
Culture Medium ◽  
Static Culture ◽  
Cymbopogon Nardus ◽  
Cellulose Membranes

Incorporation studies of particles in different substrates with herbal assets growing. The objective of this work was the preparation and characterization of micro/nanoparticles containing cymbopogon nardus essential oil; and the incorporation of them on bacterial cellulose. For the development of the membranes was used the static culture medium and for the preparation of micro/nanoparticles was used the nanoprecipitation methodology. The incorporation of micro/nanoparticles was performed on samples of bacterial cellulose in wet and dry form. For the characterization of micro/nanoparticles were carried out analysis of SEM, zeta potential and particle size. For the verification of the incorporation of particulate matter in cellulose, analyses were conducted of SEM and FTIR. The results showed that it is possible the production and incorporation of micro/nanoparticles containing essential oil in bacterial cellulose membranes in wet form with ethanol.

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