scholarly journals Optimization of ilmenite ore processing using induced roll magnetic separator

2021 ◽  
Vol 926 (1) ◽  
pp. 012106
Author(s):  
M R Virgiawan ◽  
J Pitulima
Keyword(s):  
Electric Current ◽  
Feed Rate ◽  
Current Strength ◽  
Optimization Process ◽  
High Grade ◽  
Magnetic Separator ◽  
Surface Method ◽  
Ore Processing ◽  
Best Parameter ◽  
Central Composite

Abstract PT Timah Tbk has been processing residual ore (SHP) with a low tin grade of ± 10-30% wt. To increase tins grade and associated mineral products to be a high grade (> 70% wt), an evaluation and optimization process is needed on Induced Roll Magnetic Separator processing equipment. The evaluation and optimization process was carried out on magnetic products, especially ilmenite minerals. Sampling is done on the feed and the product based on the tool parameter settings. The feed rate is set at 380, 320, 250, 420, and 470 gr/10s. The splitter opening is set at 10, 15, 20 mm of magnetic rollers. While the electric current is set at 2, 4, 6, 8, 10, 12, 14 amperes. Mass and grade data are then analyzed by regression and variance statistical methods and optimized by the response surface method. The evaluation results show that only the splitter opening parameters and electric current strength are significant in explaining the product results obtained with a level of hypothesis error of 5%. The results of IRMS optimization show that the best parameter conditions are in the 2-4 ampere of electric current and 10-15 mm of splitter openings with illmenite grade capable of> 80% wt in the second order of central composite design.

scholarly journals Influence of process parameters on surface roughness and forming time of Al-1100 sheet in incremental sheet metal forming

2019 ◽  
Vol 13 (2) ◽  
pp. 4911-4927
Author(s):  
Swagatika Mohanty ◽  
Srinivasa Prakash Regalla ◽  
Yendluri Venkata Daseswara Rao
Keyword(s):  
Surface Roughness ◽  
Response Surface ◽  
Sheet Metal ◽  
Process Parameters ◽  
Sheet Metal Forming ◽  
Feed Rate ◽  
Metal Forming ◽  
Wall Angle ◽  
Surface Method ◽  
Incremental Sheet Metal Forming

Product quality and production time are critical constraints in sheet metal forming. These are normally measured in terms of surface roughness and forming time, respectively. Incremental sheet metal forming is considered as most suitable for small batch production specifically because it is a die-less manufacturing process and needs only a simple generic fixture. The surface roughness and forming time depend on several process parameters, among which the wall angle, step depth, feed rate, sheet thickness, and spindle speed have a greater impact on forming time and surface roughness. In the present work, the effect of step depth, feed rate and wall angle on the surface roughness and forming time have been investigated for constant 1.2 mm thick Al-1100 sheet and at a constant spindle speed of 1300 rpm. Since the variable effects of these parameters necessitate multi-objective optimization, the Taguchi L9 orthogonal array has been used to plan the experiments and the significance of parameters and their interactions have been determined using analysis of variance (ANOVA) technique. The optimum response has been brought out using response surfaces. Finally, the findings of response surface method have been validated by conducting additional experiments at the intermediate values of the parameters and these results were found to be in agreement with the predictions of Taguchi method and response surface method.

Nonlinear Probabilistic Analysis of the Failure Pressure of NPP Shielding Plate

2016 ◽  
Vol 837 ◽  
pp. 214-221
Author(s):  
Juraj Kralik ◽  
Juraj Kralik Jr. ◽  
Maros Klabnik ◽  
Alzbeta Grmanova
Keyword(s):  
Monte Carlo ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Probabilistic Analysis ◽  
Nuclear Power ◽  
Safety Assessment ◽  
Fragility Curve ◽  
Failure Pressure ◽  
Surface Method ◽  
Central Composite

This paper describes the nonlinear probabilistic analysis of the failure pressure of the shielding plate of the reactor box of the nuclear power plant under a high internal overpressure and temperature. The scenario of the hard accident in Nuclear power plant (NPP) and the methodology of the calculation of the fragility curve of the failure overpressure using the probabilistic safety assessment PSA 2 level is presented. The fragility curve of the failure pressure was determined using 45 probabilistic simulations using the response surface method (RSM) with the Central Composite Design (CCD) for 106 Monte Carlo simulations for each model and 5 level of the overpressure.

PENGARUH BAYANGAN TERHADAP OUTPUT TEGANGAN DAN KUAT ARUS PADA PEMBANGKIT LISTRIK TENAGA SURYA (PLTS)

ROTOR ◽  
2018 ◽  
Vol 11 (2) ◽  
pp. 47
Author(s):  
Hattu P D Edwin ◽  
Wabang A Jhon ◽  
Tuati Ambros ◽  
Palinggi Aris
Keyword(s):  
Solar Cell ◽  
Electric Current ◽  
Output Voltage ◽  
Electrical Energy ◽  
Current Strength ◽  
The Sun ◽  
Solar Panels ◽  
Shadow Area ◽  
Strong Current ◽  
Cloud Condition

Electrical energy is a very important requirement for the community, along with the development of the era and technological advances that are urgently needed, the need for electrical energy is very large, while the source of electricity that is currently being used still uses energy derived from fossil fuels. As we know that the source of energy derived from fossils is very limited, therefore other energy sources are sought or we are more familiar with renewable energy, one of which is the energy source that comes from the sun, which is better known as solar cell. The electricity from this solar cell is very dependent on sunlight which must illuminate the solar panels so that solar energy can be converted into electrical energy. The output from these solar panels is in the form of voltage and electric current. Some factors that can affect the amount of output or output voltage of electric current in PLTS is, temperature, shadow, (cloud condition, and surrounding environment), and wind speed. Therefore, the purpose of this research is to find out how much the shadow effect on the output voltage and electric current produced by PLTS. It is expected that this research can increase the knowledge of energy derived from the sun in this case the solar cell and know the effect of the shadow on the output voltage and electric current from solar panels.The results showed that there was a shadow effect on voltage reduction and current strength in the PLTS system, namely the 10% shadow area and 12.44 volt DC solar panel current and 2.54 amperage, 100% area covering the voltage output panel and the current of solar panels 12.10 volt DC and 0.22 amperage. The area of the shadow that covers the solar panel affects the output voltage and the strong current of the battery that is the area of the shadow 10% voltage and strong current battery 12.35 volt DC and 18.54 amper, 100% area cover the output panel voltage and strong current battery 11.90 volt DC and 13.85 amperes The shadow area covering the solar panels influences the output voltage and current strength of the inverter, namely the area of the shadow 10% voltage and 226.4 volt AC inverter current and 0.97 amperage, 100% covering the output voltage panel and 220.2 volt AC and 0.66 amperage current. Keywords: Electrical energy, Solar cell, Shadow (cloud condition)

scholarly journals Decolarization of methylene blue and methyl orange with Ag doped TiO2 under UV-A and UV-Visible conditions: process optimization by response surface method and toxicity evaluation

2016 ◽  
Vol 18 (2) ◽  
pp. 371-380 ◽  
Keyword(s):  
Methylene Blue ◽  
Degradation Pathways ◽  
Composite Analysis ◽  
Photocatalytic Process ◽  
Wastewater Discharge ◽  
Toxicity Evaluation ◽  
Surface Method ◽  
Photocatalytic System ◽  
Uv Visible ◽  
Central Composite

<div> <p>MB decolarization with pure TiO<sub>2</sub> and Ag doped TiO<sub>2</sub> based photocatalytic system were investigated under UV-A and UV-Visible conditions. Different ratios of Ag were used as metal dopant. 1% Ag-TiO<sub>2</sub> increased the decolorization efficiencies of MB and MO dyes, also the k<sub>app</sub> constant enhanced under UV-A and UV-Visible conditions. A central composite analysis showed the effect of initial dye concentration, pH, Ag-TiO<sub>2</sub> concentration and the reaction time of photocatalytic process under UV-A irridation in both dyes. The photocatalytic degradation pathways of both dyes by Ag doped TiO<sub>2</sub> catalyst were obtained in this study. According to these results, the application of Ag-TiO<sub>2</sub> catalyst are proved to be more effective than pure TiO<sub>2</sub> catalyst for both MB and MO removal. The toxicity test of Daphnia Magna shows that non toxic wastewater discharge to the receiving environment could be possible with photocatalytic degration by Ag-TiO<sub>2</sub> catalyst.</p> </div> <p>&nbsp;</p>

scholarly journals THE MAGNETIC PROPERTIES MEASUREMENT OF COIL FOR GRAVITATIONAL ACCELERATION DETERMINATION

2020 ◽  
Vol 5 (2) ◽  
pp. 119-128
Author(s):  
Cherly Salawane ◽  
Supriyadi Supriyadi ◽  
Ronaldo Talapessy ◽  
Mirtha Yunitha Sari Risakotta
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Field Strength ◽  
Electric Current ◽  
Graphical Method ◽  
Current Strength ◽  
Gravitational Acceleration ◽  
The Earth ◽  
The Magnetic Field ◽  
A Current

The value of the gravitational acceleration of the earth above the earth’s surface depends on the position of the latitude and longitude of the earth’s surface, in other words, because the shape of the earth’s surface is not round like a ball. The magnitude of gravity is not the same everywhere on the surface of the earth. The purpose of this study is to analyze the value of the earth’s gravitational acceleration in a laboratory using a current balance with a graphical method. Fluctuations in the value of the magnetic field strength (B) and the value of the electric current strength (i) on the current balance cause the value of laboratory gravitational acceleration (glab) to vary in the transfer of electric charge (q) according to coil type. The magnitude of the earth’s gravitational acceleration value obtained in a laboratory with a current balance for each type of coil is as follows: SF-37 glab-nr=9.89 m/s2, SF-38 glab-nr=9.90 m/s2, SF-39 glab-nr=9.76 m/s2, SF-40 glab-nr=9.95 m/s2, SF-41 glab-nr=9.75 m/s2 dan SF-42 glab-nr=9.93 m/s2. The results obtained indicate that the value of the earth’s gravitational acceleration in a laboratory close to the literature value is the value of the glab-nr in the SF-37 coil type of 9.89 m/s2.

scholarly journals Karakterisasi Mutu Ekstrak Kopi Hijau di Jawa Timur untuk Meningkatkan Nilai Ekonominya sebagai Bahan Sediaan Obat

2020 ◽  
Vol 9 (3) ◽  
pp. 228-240
Author(s):  
Claudia Gadizza Perdani ◽  
◽  
Dodyk Pranowo ◽  
Susinggih Wijana ◽  
Delia Muliawati ◽  
...  
Keyword(s):  
Central Composite Design ◽  
Response Surface ◽  
Response Surface Method ◽  
Surface Method ◽  
Central Composite

Kandungan polifenol dalam kopi hijau berpotensi menurunkan akumulasi lemak viseral sehingga dapat menurunkan kadar kolesterol total secara signifikan. Kopi hijau memiliki rasa kurang nikmat ketika dikonsumsi, sehingga perlu penelitian mengenai ekstraksi polifenol untuk diolah sebagai produk bernilai jual tinggi. Tujuan dari penelitian ini adalah optimasi kombinasi konsentrasi dan rasio penambahan pelarut yang optimal dalam menghasilkan rendemen dan kadar fenol tertinggi pada proses ekstraksi senyawa polifenol biji kopi hijau. Metode optimasi yang digunakan adalah Response Surface Method dengan Central Composite Design. Penelitian dilakukan menggunakan dua variabel optimasi yaitu konsentrasi pelarut etanol (60–90%) dan rasio pelarut (20–40 ml/g). Respon yang diukur adalah total fenol dan rendemen ekstrak. Kondisi optimum yang diperoleh adalah pada ekstraksi menggunakan konsentrasi pelarut 84,92% dan rasio 40 ml/g dengan desirability sebesar 0,87. Hasil prediksi program menghasilkan total fenol sebesar 534,50 mg GAE/g dan rendemen ekstrak 17,179%. Hasil verifikasi solusi optimal adalah total fenol sebesar 538,83 mg GAE/g dan rendemen 15,39%.

scholarly journals Investigation of the optimal treatment condition for flax rove in supercritical CO2

2018 ◽  
Vol 22 (4) ◽  
pp. 1613-1619
Author(s):  
Juan Zhang ◽  
Jin-Song Wu ◽  
Xian-Dong Jing ◽  
Zhao-Tie Liu ◽  
Lai-Jiu Zheng
Keyword(s):  
Supercritical Co2 ◽  
Treatment Condition ◽  
Treatment Process ◽  
Polynomial Equation ◽  
Green Solvent ◽  
Surface Method ◽  
Final Response ◽  
Temperature And Pressure ◽  
Experimental Values ◽  
Central Composite

Three treatment parameters of supercritical CO2 have been optimized by a response surface method using central composite design to obtain isolate yield of flax rove. Influence of operating parameters including dosage of cellulase, temperature, and pressure on final response is evaluated. The results show that the experimental values are adequately fitted to a quadratic polynomial equation. The optimal isolate yield is obtained with 2% cellulase dosage under temperature of 50?C and pressure of 20 MPa. Mathematical model is also applied to describe the kinetic behavior of the treatment process, revealing that supercritical CO2 is a promising green solvent for the scouring and bleaching of flax rove.

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