Pengaruh Penambahan Viscosity Modifier dan Hidrogen Peroksida (H2O2) terhadap Recovery Emas dan Perak

2021 ◽  
Vol 1 (9) ◽  
pp. 345-349
Author(s):  
Fitria Fitria ◽  
Saripah Sobah
Keyword(s):  

Metode ekstraksi emas yang saat ini banyak digunakan untuk keperluan eksploitasi emas skala industri adalah metode sianidasi dan metode amalgamasi. Recovery logam minor seperti emas dan perak untuk skala industri pada umumnya menggunakan teknik hidrometalurgi atau leaching (pelarutan selektif). Banyak reagen atau pereaksi yang bisa digunakan untuk proses leaching guna mengekstrak logam emas dan perak dari bijihnya, diantara reagen-reagen tersebut salah satunya menggunakan reagen sianida. tujuan dari percobaan Mengetahui Pengaruh viscosity modifier terhadap perolehan rekoveri  emas dan mengetahui pengaruh hidrogen peroksida (H2O2) terhadap perolehan recovery emas. Ore yang digunakan dalam penelitian berukuran 37 ?m, dimasukkan kedalam botol A, B, C, D, E dan F dan tambahkan air sebanyak 733 ml, viscosity modifier sebanyak 0, 100, 200, 300, 400 dan 500 ppm, diputar selama 5 menit kemudian ditambahkan CN 10% selanjutnya botol diputar selama 2, 4, 8, 24, 32 dan 48 jam hal yang sama dilakukan pada penambahan hidrogen peroksida. Dari hasil penelitian yang dilakukan penambahan viscosity modifier 100 hingga 300 ppm  dapat menaikkan recovery Au sebanyak 1,58 % untuk Ag tidak menunjukkan pengaruh kenaikan recovery. Penambahan H2O2 tidak berpengaruh terhadap kenaikan recovery Au (emas) tetapi dapat menaikkan recovery Ag sebesar 1,21747 % untuk 400 ppm, dan 1.58937 % untuk 500 ppm.

2018 ◽  
Author(s):  
Stefan C. Figueiredo ◽  
Oğuzhan Çopuroğlu ◽  
Erik Schlangen

2017 ◽  
Vol 25 (3) ◽  
pp. 185-193 ◽  
Author(s):  
Mouhamed Bayane Bouraima ◽  
Xiao-hua Zhang ◽  
Shui-wen Zhou ◽  
Yanjun Qiu

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Darya Ewaznezhad Fard ◽  
Saeideh Gorji Kandi ◽  
Marziyeh Khatibzadeh

Purpose The purpose of this study is to investigate the changes in the performance of ink formulations caused by the addition of compounds that improve the ink’s physical properties to achieve an optimum formulation for inkjet printing, because of the importance and simplicity of this method. Design/methodology/approach Ink samples were formulated using Acid Red 14 as ink colorant, different percentages of polymeric compounds including polyvinyl alcohol (PVA), polyvinylpyrrolidone and Carboxy methyl cellulose (CMC) as viscosity modifier compounds and surfactant as the surface tension enhancer. Formulated samples were adjusted in terms of fluid physical properties e.g. viscosity, density and surface tension, and the effect of used compounds on the improvement of both physical and colorimetric properties such as viscosity, surface tension, colorimetric coordinates and lightfastness has been evaluated to achieve the optimum printing inks to be printed on three different substrates. Findings The experimental observations showed that CMC was the most compatible compound as the viscosity modifier as its viscosity value was in the printable range of 2–22 cP. Moreover, a flow-curve test was applied to the ink samples and their Newtonian behavior was approved. Based on the spectrophotometric test results of printed samples, the samples containing PVA provided acceptable lightfastness in comparison to other ink samples on every used substrate. Originality/value An optimum relation between colorimetric coordinates of the printed samples and ink formulation could be considered and achieved.


2019 ◽  
Vol 212 ◽  
pp. 818-840 ◽  
Author(s):  
Stefan Chaves Figueiredo ◽  
Oğuzhan Çopuroğlu ◽  
Erik Schlangen

2021 ◽  
Vol 899 ◽  
pp. 309-316
Author(s):  
Ismel V. Musov ◽  
Azamat L. Slonov ◽  
Azamat A. Zhansitov ◽  
Zhanna I. Kurdanova ◽  
Svetlana Yu. Khashirova

The influence of the multiplicity of extrusion and melt viscosity on the residual length of discrete carbon fibers in composites based on polyetherimide for 3D-printing is estimated. A technique for measuring the residual length of carbon fibers in composites is proposed. The residual length of carbon fibers in composites containing from 10 to 40% fibrous filler with different initial linear dimensions has been determined. It was found that the addition of a melt viscosity modifier to a carbon-filled composite helps to maintain the linear dimensions of the fiber filler particles, thereby increasing the physical and mechanical properties of the material.


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