scholarly journals Characterization of gold ore from Babakan Loa Sub-District and leaching study in cyanide solution

2021 ◽  
Vol 882 (1) ◽  
pp. 012027
Author(s):  
L O Arham ◽  
F R Mufakhir ◽  
I A Putri ◽  
Wahab ◽  
H Z Hakim ◽  
...  
Keyword(s):  
Grain Size ◽  
Clay Content ◽  
Xrd Analysis ◽  
Cyanide Solution ◽  
Gold Extraction ◽  
Gold Ore ◽  
Leaching Process ◽  
Wet Chemical ◽  
Ore Characterization

Abstract Research on the characterization of gold ore from Babakan Loa sub-district and studies of leaching in cyanide solution has been carried out. This research was conducted to determine the characteristics of gold ore from Babakan Loa and the leaching behavior in cyanide solution. The preparations carried out were crushing and grinding to obtain several size fractions. The ore characterization was carried out through XRD, XRF, SEM-EDX, and wet chemical analysis. XRD analysis results show that the main mineral phases are quartz, hematite, goethite, kaolinite, montmorillonite, and berlinite. The main constituents of the ore were Si (60.96%), Fe (10.71%), K (5.47%), and Al (19.53%). The Au content was 7.8 ppm, and the results of SEM-EDX analysis show that the gold grain size is smaller than 10µm. The leaching process showed that the highest percent gold extraction data of 92.7% was obtained in experiments with 1000 ppm sodium cyanide concentration, 10% solids percent, and 104-149µm grain size. Increasing the percentage of solids and the reduction in grain size led to a decrease in the percentage of gold extraction. The clay content was suspected to be the cause of the ineffectiveness of the leaching process in this study.

scholarly journals Studi Ekstraksi Bijih Emas Asal Pesawaran dengan Metode Pelindian Agitasi dalam Larutan Sianida

2020 ◽  
Vol 4 (2) ◽  
pp. 103
Author(s):  
La Ode Arham ◽  
Fika Rofiek Mufakhir ◽  
Hendra Saputra
Keyword(s):  
Grain Size ◽  
Chemical Analysis ◽  
Xrd Analysis ◽  
Gold Extraction ◽  
Gold Ore ◽  
Sieve Size ◽  
Mineral Phases ◽  
Ore Preparation ◽  
Wet Chemical ◽  
Ore Characterization

Research on the extraction of gold ore from Pesawaran, , Lampung, Indonesia, was carried out using the agitation leaching method in cyanide solution. This study aimed to obtain information on the use of conventional cyanidation methods for extracting gold from the Pesawaran gold ore. The ore preparation was carried out in the form of crushing, grinding and sieving to obtain samples with fraction sizes of -60 + 100 mesh, -100 +150 mesh, -150 + 200 mesh and -200 mesh. The ore characterization was performed using XRD, XRF, SEM-EDX, and wet chemical analysis. The XRD analysis showed that the main mineral phases were silica, hematite, aluminium hydroxide and orthoclase. The major constituents of the ore were Si (53,628%), Fe (15,996%), K (19,744%) and Al (8,045%). The Au content was determined by wet chemical analysis and was found to be 9.67 ppm. The experimental results show that the highest percentage of gold extraction of 83.33% was obtained using sodium cyanide at a concentration of 1000 ppm, a percent solids of 40% and a grain size of 200 mesh. Higher gold extraction was not achieved despite the use of a high cyanide concentration was probably because the remaining gold was not properly liberated. The results of SEM-EDX analysis showed that the gold grain size was <20 µm, while the grinding was performed only to a sieve size of -200 mesh (74 µm).

Synthesis and Characterization of Structure Controlled Nano-cobalt Particles

2002 ◽  
Vol 755 ◽  
Author(s):  
Shiqiang Hui ◽  
Mingzhong Wu ◽  
Shihui Ge ◽  
Dajing Yan ◽  
Y.D. Zhang ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Silica Coating ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Average Grain Size ◽  
Wet Chemical ◽  
Face Centered

ABSTRACTNanostructured cobalt particles with and without a ceramic coating have been synthesized using a wet chemical method. The structure and magnetic properties of synthesized powder were characterized using x-ray diffraction (“XRD”), high-resolution transmission electron microscopy (“HRTEM”), and a Quantum Design (SQUID) magnetometer. The cobalt nanoparticles are of either face-centered cubic (“fcc”) and/or hexagonally close-packed (“hcp”) crystalline structures. The average grain size is ∼14 nm for cobalt (either fcc or hcp) with an amorphous silica coating, and the average grain size is ∼9 nm for hcp cobalt and 26 nm for fcc cobalt without a silica coating. The effect of annealing temperature on grain size and magnetic properties are addressed.

Synthesis and Characterization of In Situ AlN Reinforced Magnesium Matrix Composites

2012 ◽  
Vol 710 ◽  
pp. 377-382
Author(s):  
Sreeja Kumari Sukumaran Suseelammaa ◽  
Uma Thanu Subramonia Pillai ◽  
Sujayakumar Prasanth ◽  
Bellampettu Chandrasekhar Pai
Keyword(s):  
Grain Size ◽  
Xrd Analysis ◽  
Synthesis And Characterization ◽  
Matrix Composites ◽  
Nitrogen Gas ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
Gas Bubbling

In situ Mg-AlN composite has been synthesized by nitrogen gas bubbling method. The morphology of the particles is found to be hexagonal by SEM. The size of the AlN particles is found to be in the range from nano, submicron to a few microns. XRD analysis of the samples confirms the formation of AlN in the melt. Further, the grain size of the magnesium matrix has been reduced by the presence of AlN particles. Hardness of the composite is significantly increased in the particle rich area due to the presence of hard AlN particles.

Preparation and Characterization of Different Metal Modified BaTiO3 Powders

2010 ◽  
Vol 105-106 ◽  
pp. 342-344 ◽  
Author(s):  
J.L. Li ◽  
S.E. Hao ◽  
C.Y. Wang ◽  
F.X. Kong ◽  
W. Wang
Keyword(s):  
Grain Size ◽  
Significant Influence ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Room Temperature Resistivity ◽  
Peak Width ◽  
Small Grains ◽  
Temperature Resistivity ◽  
Sem Investigation

BaTiO3 powders modified with Sm, La, Cu, Al, Zn were prepared by solid doping and gaseous penetration method and their components, structure, superficies and electric properties were characterized. The results show that the resistivity of the modified powders is decreased after both solid doping and gaseous penetration, and it is more obviously after gaseous penetration. Among all the metals being discussed, Sm has the most significant influence on decreasing the resistivity of modified powders. The room temperature resistivity of Sm-penetrated BaTiO3 powders is the lowest, which decreases from 8.3×1010Ω•m (pure BaTiO3 powders) to 1.65×105Ω•m. SEM investigation illustrates that the powders are in uniform grain size. No apparent pores and small grains are found. XRD analysis indicates that the doping process only leads to the changes of the peak width and intensity without new phases appearing, but characteristic peaks of Sm2TiO5, SmTiO3, and Ba10.37Sm17.08Ti36O108 can be detected after gaseous penetrated, which leads to the decrease of the resistivity of modified BaTiO3 powders.

Preparation and Characterization of Cube-Textured Ni-5 at.% W Substrates for Coated Conductors

2013 ◽  
Vol 537 ◽  
pp. 269-273
Author(s):  
Xing Pin Chen ◽  
Jing Peng Zhang ◽  
Xue Chen ◽  
Yong Bin Ji
Keyword(s):  
Grain Size ◽  
Cube Texture ◽  
Xrd Analysis ◽  
Coated Conductors ◽  
Coated Conductor ◽  
High Temperature Annealing ◽  
Full Width ◽  
Half Maximum ◽  
Out Of Plane

The goal of present study was to manufacture and characterize the Ni-5 at.% W alloy substrates for coated conductor applications with a strong cube texture. Cube-textured Ni-5 at.% W alloy substrates were fabricated by heavy cold rolling (98%) and a high temperature annealing (1200°C). From the EBSD and XRD analysis of the fully recrystallized tapes, the cube texture component in the tape was found to reach a proportion as high as 99.5% within a tolerance angle of less than 9o, while the FWHM (full width at half maximum) values of the out-of-plane and in-plane textures are about 5.8o and 6.9o, respectively. Moreover, the grain size distribution is homogeneous, and there is a large amount of low angle grain boundaries (95.6%). This process is very suitable for preparation of substrates for coated conductors.

Structural and Electrical Characterization of Shaped Beam Laser Recrystallized Polysilicon on Amorphous Substrates

1981 ◽  
Vol 4 ◽  
Author(s):  
T. J. Stultz ◽  
J. F. Gibbons
Keyword(s):  
Grain Size ◽  
Electrical Characterization ◽  
Grain Structure ◽  
Electrical Characteristics ◽  
Shaped Beam ◽  
Beam Laser ◽  
Cw Laser ◽  
Amorphous Substrates ◽  
Circular Beam

ABSTRACTStructural and electrical characterization of laser recrystallized LPCVD silicon films on amorphous substrates using a shaped cw laser beam have been performed. In comparing the results to data obtained using a circular beam, it was found that a significant increase in grain size can be achieved and that the surface morphology of the shaped beam recrystallized material was much smoother. It was also found that whereas circular beam recrystallized material has a random grain structure, shaped beam material is highly oriented with a <100> texture. Finally the electrical characteristics of the recrystallized film were very good when measured in directions parallel to the grain boundaries.

Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction

2021 ◽  
Vol 164 ◽  
pp. 106822
Author(s):  
Hong Qin ◽  
Xueyi Guo ◽  
Qinghua Tian ◽  
Dawei Yu ◽  
Lei Zhang
Keyword(s):  
Gold Extraction ◽  
Gold Ore ◽  
Refractory Gold
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