scholarly journals Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia

2021 ◽  
Vol 9 ◽  
Author(s):  
Yuri Choi ◽  
Insung Lee ◽  
Inkyeong Moon
Keyword(s):  
Cation Exchange ◽  
Electron Probe ◽  
Mineralization Process ◽  
Ore Deposit ◽  
Electron Probe Micro Analyzer ◽  
Mineralogical Characteristics ◽  
Fe Content ◽  
Geochemical Study ◽  
Different Types ◽  
Bottom To Top

The Morowali Ni-laterite deposit is located in the East Sulawesi Ophiolite, which is a large ophiolite belt on Sulawesi Island, Indonesia. The Morowali deposit is developed on a laterite profile due to ophiolite weathering, with saprolite, limonite, and ferruginous cap horizons from the bottom to top. Based on the occurrence of garnierite as the main ore, occurring in the saprolite horizon, it can be classified that the ore deposit is hydrous Mg silicate-type. The Ni ore is classified into different types based on color and XRD and electron probe micro-analyzer analyses. Whole-rock geochemical study was also conducted to understand the mineralization process. The Morowali Ni deposit consists of serpentine-like and talc-like phases. The serpentine-like phase consists of Ni-lizardite and karpinskite (0.76–38.26 wt% NiO) while the talc-like phase is mainly composed of kerolite (4.02–8.02 wt% NiO). The serpentine-like garnierite exhibits high Ni and Fe contents and occurrence similar to that of the serpentine observed in the saprolite horizon, suggesting the serpentine-like garnierite originated from the bedrock, and Mg-Ni cation exchange occurred during laterization. Contrastingly, the lower Fe content of the talc-like phase (0.01–0.05 wt%) than the serpentine-like phase (0.14–7.03 wt%) indicates that the talc-like garnierite is of secondary origin since Fe is immobile during weathering. The Morowali Ni-laterite deposit was mainly formed during laterization. The repetition of dry and wet cycles in each year results in the formation of secondary garnierite.

Effect of Fe Content on Microstructures and Mechanical Properties of the Heat-Treated Squeeze Cast Al-5.0Cu-0.6Mn Alloy

2015 ◽  
Vol 817 ◽  
pp. 82-89 ◽  
Author(s):  
Bo Lin ◽  
Zhao Hui Lou ◽  
Jian Lei Fan ◽  
Cheng Kun Zheng ◽  
Wei Wen Zhang
Keyword(s):  
Mechanical Properties ◽  
Electron Probe ◽  
Squeeze Casting ◽  
Cast Alloy ◽  
Electron Probe Micro Analyzer ◽  
Squeeze Cast ◽  
Fe Content ◽  
Heat Treated ◽  
Microstructures And Mechanical Properties ◽  
Scanning Electron

The microstructures and mechanical properties of T5 heat-treated Al - 5.0 wt % Cu - 0.6 wt % Mn alloys with different Fe content prepared by squeeze casting were studied by tensile test, optical microscopy (OM), scanning electron microscope (SEM) and electron probe micro-analyzer (EPMA). The results showed that the dominate Fe-rich intermetallics are α (CuFe) with a few Al3(FeMn),Al6(FeMn), and α-Fe in the alloys depending on different Fe content. With the increasing Fe content continually, the ultimate tensile strength and elongation of the alloys decreased gradually. This is attributed to the increasing amount of Fe-rich intermetallics, the decrease of precipitation particles in α (Al) matrix and the increase of α (Al) dendrite size. The elongation level of 13.7% was still obtained in the squeeze cast alloy even when the Fe content was as high as 1.5%.

Internal Features of Glass Filled Ruby Samples Probed by EPMA

2017 ◽  
Vol 744 ◽  
pp. 409-413
Author(s):  
Natthapong Monarumit ◽  
Chakkrich Boonmee ◽  
Sermrak Ingavanija ◽  
Thanapong Lhuaamporn ◽  
Pornsawat Wathanakul ◽  
...  
Keyword(s):  
Electron Probe ◽  
Treatment Process ◽  
High Alumina ◽  
Lead Glass ◽  
Chemical Additives ◽  
Electron Probe Micro Analyzer ◽  
Macro Scale ◽  
Different Types ◽  
Chemical Content ◽  
Non Destructive

Glass filled ruby is one of the treated rubies that consist of the additive substance to improve the clarity of ruby. There are many variations of glass filled rubies based on their chemical additives to fulfill the fractures during heat treatment process. However, the quality and the price of ruby are related to the different types of glass materials. Thus, the aim of this study is important to classify the type of glass materials inside the ruby samples by a non-destructive property such as their internal features. In this research, the glass filled ruby samples were collected including lead-glass filled rubies and high alumina-glass filled rubies. The surface and internal features in macro scale of the samples were observed by gem microscope. Moreover, their internal features were magnified to detect the chemical content of fractures and groundmass using electron probe micro analyzer (EPMA). As the results, there are high PbO and SiO2 in the fractures of lead-glass filled rubies. Besides, there are high Al2O3 mixing with SiO2 in the fractures of high alumina-glass filled rubies. It could be summarized that the varieties of glass filled ruby samples have been classified by the glass materials in their fractures.

Mineralogical Characteristics of Exsolved Spinel in the Panzhihua V‐Ti Magnetite Deposit, Sichuan: Implications for the Mineralization Process

2018 ◽  
Vol 92 (5) ◽  
pp. 1784-1797 ◽  
Author(s):  
Zhibin ZHANG ◽  
Fei HUANG ◽  
Miaomiao XING ◽  
Quan WAN ◽  
Wenyuan GAO ◽  
...  
Keyword(s):  
Mineralization Process ◽  
Mineralogical Characteristics

Mineralogical Study of Huashan Granite-Type Uranium Ore Deposit in Northeast of Guangxi

2012 ◽  
Vol 621 ◽  
pp. 17-22 ◽  
Author(s):  
Zhi Qiang Kang ◽  
Zuo Hai Feng ◽  
Yong Gao Huang ◽  
Hong Yi Chen ◽  
Wei Fu ◽  
...  
Keyword(s):  
Uranium Mineral ◽  
Ore Deposit ◽  
Granite Pluton ◽  
Uranium Ore ◽  
Mineralogical Characteristics ◽  
Granite Type ◽  
Mineralogical Study ◽  
Mineral Compositions ◽  
The Difference ◽  
Main Component

Huashan granite-type uranium ore deposit is originated within the Huashan granite pluton in northeast of Guangxi, the mineral (mineralization) occurrences already found include Changchong, Baishijiao and Caomiping. Previous studies are relatively weak, especially in mineralogical characteristics, in this paper, a detailed study of minerals has been carried out through EPMA and EDS, the results show that the uranium mineral compositions of the three mineral (mineralization) occurrences are significantly different, but all of them are of secondary uranium minerals, among them, the main component of Changchong mineral (mineralization) occurrence is (meta-) autunite, of Baijiaoshi mineral (mineralization) occurrence is kasolite, and of Caomiping mineral (mineralization) occurrence is torbernite and zeunerite, which reflect the difference of their minerals sources.

scholarly journals Purification and properties of glutathione S-transferases from larvae of Wiseana cervinata

1984 ◽  
Vol 217 (1) ◽  
pp. 41-50 ◽  
Author(s):  
A G Clark ◽  
B Drake
Keyword(s):  
Cation Exchange ◽  
Ethacrynic Acid ◽  
Catalytic Properties ◽  
Exchange Chromatography ◽  
Cation Exchange Chromatography ◽  
Purification And Properties ◽  
Different Types ◽  
Glutathione S Transferases ◽  
Physical And Chemical ◽  
Kinetics Of

The glutathione S-transferases from the porina moth, Wiseanna cervinata, were purified by affinity chromatography, cation-exchange chromatography and preparative isoelectrofocusing. The major transferase (IV) was purified to homogeneity by a factor of 530-fold with a yield of 83%. Other transferases present were purified to a smaller degree (approx. 50-fold) to a stage of near-homogeneity. The transferases examined all had Mr values about 45 000-50 000. They appeared to be homodimers of either of two types of subunit, of Mr 22 800 and 24 600. Enzymes consisting of the different types of subunit were not immunologically cross-reactive. The major enzyme fractions separated by cation-exchange chromatography were both active with 1-chloro-2,4-dinitrobenzene, 1,2-dichloro-4-nitrobenzene, ethacrynic acid and iodomethane, but were inactive with 4-nitropyridine N-oxide, 1,2-epoxy-3-(p-nitrophenoxy)propane, bromosulphophthalein and p-nitrobenzyl chloride. The kinetics of the enzyme-catalysed reaction with enzyme IV were non-Michaelean with respect to both substrates. Both products were inhibitory. The results appear to be compatible with a random steady-state mechanism. It is concluded that these enzymes are very similar, in their physical and chemical constitution, in their catalytic properties and in their relationships with each other, to those enzymes that have been isolated from vertebrate organisms.

Preparation of Al2O3/Al-Si Composites by In Situ Reaction of Fe2O3+MnO2/Al System

2015 ◽  
Vol 816 ◽  
pp. 48-53
Author(s):  
Jing Zhang ◽  
Hua Shun Yu ◽  
Xin Ting Shuai ◽  
Hong Mei Chen ◽  
Guang Hui Min
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Electron Probe ◽  
Room Temperature ◽  
Manganese Content ◽  
Hardness Test ◽  
Test Results ◽  
Electron Probe Micro Analyzer ◽  
Transmission Electron ◽  
Polygonal Shape

Al2O3 particles reinforced ZL109 composites were prepared by in-situ reaction between Fe2O3+MnO2 and Al in this paper. The influence of ratio of Mn to Fe on the morphologies of Al-Si-Mn-Fe phase and mechanical properties of the composites was investigated. The microstructure was studied by electron probe micro-analyzer (EPMA) and transmission electron microscopy (TEM). The results show that the Al2O3 particles displaced by the Fe2O3+MnO2/Al system are in nanosize. The acicular Al-Si-Fe phases change from acicular to polygonal shape and become smaller with the increase manganese content. The hardness test results have no big difference on the composites. However, the ultimate tensile strength at room temperature and 350°C enhance evidently with the increasing of Mn/Fe.

scholarly journals Studies on Structure and Coloring of Aluminum Anodic Oxide Films by Electron Probe Micro-Analyzer

1972 ◽  
Vol 23 (1) ◽  
pp. 18-24 ◽  
Author(s):  
Toshiro TAKAHASHI ◽  
Toshihiro NAGANO ◽  
Kenji WADA ◽  
Masashi IKEGAYA ◽  
Hideo TAGAI
Keyword(s):  
Electron Probe ◽  
Oxide Films ◽  
Anodic Oxide ◽  
Anodic Oxide Films ◽  
Electron Probe Micro Analyzer

scholarly journals ĐẶC ĐIỂM QUẶNG HÓA VÀ KHOÁNG VẬT CÁC MỎ KẼM CHÌ KHU VỰC LÀNG HÍCH

2011 ◽  
Vol 33 (1) ◽  
pp. 85-93
Author(s):  
Phạm Ngọc Cẩn ◽  
Trần Tuấn Anh ◽  
Trần Trọng Hòa ◽  
Phạm Thị Dung ◽  
Ngô Thị Phượng ◽  
...  
Keyword(s):  
Ore Deposit ◽  
Mineralogical Characteristics ◽  
Mineral Assemblages ◽  
Very High

Chemical and mineralogical characteristics of Zn-Pb ores in Lang Hich areaLang Hich ore deposit consisting of 6 mining places (West Metis, East Metis, Hang Chua, Bac Lau, Mo Ba - 1Aoven, Mo Ba - 1B) was discovered in 1905 and has been exploited since 1913. Anually, the mine have been exploited ~20000 T, inspite of lacking detail investigation in mineralogy and chemistry of ores.Two mineral assemblages have been clafsified in Lang Hich deposit as followed : 1) pyrite-galenite-sphalerite (Metis,Mo Ba), 2) galenite-sphalerite (Bac Lau, Hang Chua). Basically, sphalerites, have low Fe, In contents ; Bi is medium ; Mn and Cd is high, especially, Cd have very high content. While galenite contains Ag at economical value, besides, the presence of Sb is recored. Other investigation also shows the existing of tetraedrite group, an Ag bearing mineral group, and bournonite, a Sb bearing mineral.

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