Article Per Year (5 Year)
p-Index From 2020 - 2025
1.642
P-Index
This Author published in this journals
All Journal Rekayasa Mesin jurnal dikdas bantara International Journal of Innovation in Mechanical Engineering and Advanced Materials JPT : Jurnal Pendidikan Tematik
Sundari, Rita
Unknown Affiliation
Religion Automotive Engineering Chemistry Education Energy Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Other

Published : 7 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 7 Documents
Search

 1 
PYROMETALLURGICAL PROCESS FOR ZINC ANALYSIS IN SPHALERITE APPLYING XRD AND XRF Dahani, Wiwik; Kurniawati, Riskaviana; Sundari, Rita; Marwanza, Irfan; Rachman, Faisal
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1525

Abstract

This paper has analyzed dominant zinc element in sphalerite naturally found together with galena in mineral ore. Since pyrometallurgical route related to roasting process is very common to mineral dressing, therefore, this investigation has studied the effect of varied roasting time (30 min, 60 min, and 90 min) and temperature (500oC, 600oC, and 700oC) on zinc mineral examination using XRD (X-Ray Diffraction) and zinc element using XRF (X-Ray Fluorescence) analyses. Previous studies usually applied cheaper AAS (Atomic Absorption Spectrometer) for zinc analysis in aqueous solution, however, sphalerite is a solid matrix and therefore, this study has applied XRF to analyze zinc. Pyrometallurgical process of zinc mineral in sphalerite is related to mineral transformation in the form of ZnSO4, ZnS, and ZnO that cannot be detected by XRF. Therefore, this study has used XRD that can observe mineral transformation.   The XRD pattern shows four intense peaks at 2θ (28o, 47o, 56o, and 76o) justified sphalerite (ZnS) sample with little amount of pyrite (FeS2) and galena (PbS) as impurities. The XRF analysis shows from 30 min to 90 min, the Zn content has increased remarkably at 700oC and Zn content looked stagnant at 500oC, while Zn content increased dramatically from 60 min to 90 min at 600oC. During roasting process at high temperature, ZnS mineral converted to ZnO and expelled SO2 gas due to oxidation reaction causing weight reduction. The study is valuable for mineral processing in searching for optimization.
BUKU JENDELA DUNIA: PERAN PERPUSTAKAAN SEKOLAH DALAM MENINGKATKAN MOTIVASI DAN HASIL BELAJAR SISWA DI SDN 3 SITIREJO WAGIR Azizah, Nurul; Suswandari, Meidawati; Sundari, Rita; Milhani, Yuhanida
Jurnal Dikdas Bantara Vol.8 No.1 (2025)
Publisher : Universitas Veteran Bangun Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32585/dikdasbantara.v7i2.5740

Abstract

Artikel ini membahas tentang peran perpustakaan dalam mendukung proses pembelajaran untuk meningkatkan motivasi dan hasil belajar siswa di SDN 3 Sitirejo Kecamatan Wagir Kabupaten Malang. Pokok masalah yang diangkat dalam penelitian ini adalah bagaimana Peranan Perpustakaan dalam Mendukung Proses Pembelajaran Siswa SDN 3 Sitirejo dan faktor yang menjadi penghambat perpustakaan dalam mendukung proses pembelajaran. Tujuan dalam penelitian ini untuk mengetahui bagaimana Peranan Perpustakaan dalam Mendukung Proses Pembelajaran dan faktor yang menjadi penghambat perpustakaan dalam mendukung proses pembelajaran siswa SDN 3 Sitirejo Kecamatan Wagir Kabupaten Malang. Dalam penelitian ini, penulis menggunakan jenis penelitian deskriptif. Dengan menggunakan metode pendekatan kualitatif. Instrumen yang digunakan dalam penelitian ini adalah peneliti sendiri dengan alat bantu berupa pedoman wawancara, kamera handphone dan tape recorder. Teknik analisis data yang digunakan adalah teknik analisis data deskriptif kualitatif yaitu reduksi data, penyajian data dan verifkasi data. Hasil penelitian ini menunjukkan bahwa perpustakaan sangatlah berperan penting dalam mendukung proses pembelajaran siswa SDN 3 Sitirejo Kecamatan Wagir Kabupaten Malang karena siswa sudah memanfaatkaan perpustakaan dalam proses pembelajaran dan perpustakaan menyediakan koleksi yang dapat memenuhi kebutuhan informasi bagi pengguna dengan menyesuaikan kurikulum di sekolah sehingga dapat menunjang proses pembelajaran, hanya saja dari segi (SDM) pengelola perpustakaan yang tidak berlatar belakang ilmu perpustakaan sehingga belum memiliki mutu dan kualitas sebagai tenaga profesional apalagi dia juga merangkap sebagai tenaga pengajar sehingga pelayanan di perpustakaan tidak terlalu efektif selain itu kurangnya jumlah eksemplar buku dari sebagian mata pelajaran.
EFFECT OF SiO2 AND ZnO NANOPARTICLES TO INCREASE REFRIGERATION MACHINE PERFORMANCE Irwansyah, Dandi; Sundari, Rita; Anggraini, Rini; Arifin, Khuzaimah
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 5, No 2 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v5i2.21859

Abstract

In this investigation, the impact of silicon dioxide (SiO2) and zinc oxide (ZnO) nanoparticles on the performance of a refrigeration machine system was systematically examined. The focus was on evaluating the coefficient of performance (COP) concerning the utilization of a polyolester (POE) lubricant, R600a refrigerant, and distinct nanoparticles (SiO2 and ZnO) within the refrigeration system. The nanoparticles were individually introduced into the R600a refrigerant in masses of 0.5 g, 1.0 g, and 1.5 g. The experimental outcomes demonstrated a noteworthy enhancement in COP with the addition of nanoparticles. Specifically, the introduction of 1.5 g of SiO2 resulted in a substantial increase of 25.88% in COP, marking it as the most influential dosage. Similarly, the addition of 1.0 g of ZnO led to a significant COP increase of 13.6%, representing the optimal quantity for ZnO. Furthermore, the inclusion of 1.5 g of SiO2 brought about a remarkable reduction in energy consumption, with a decrease of 25.58%, while 1.5 g of ZnO resulted in a notable 16.28% decrease in energy consumption. The experimental configuration involved the use of 20 g of refrigerant and 500 ml of POE lubricant. Comparative analysis demonstrated that the refrigeration system incorporating nanoparticles outperformed the conventional R600a refrigeration system devoid of nanoparticles. This study contributes valuable insights into the potential enhancements in refrigeration system efficiency through the strategic incorporation of SiO2 and ZnO nanoparticles, offering a promising avenue for optimizing the performance of refrigeration technology.
Optimization of Titanium Recovery from Tin Tailings Using Flotation Route Subandrio, Subandrio; Dahani, Wiwik; Sundari, Rita; Kurniawati, Riskaviana; Marwanza, Irfan; Darren, Franko Sajow
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 6, No 3 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v6i3.28891

Abstract

Titanium has found widespread application across various industries due to its high corrosion resistance. It is commonly used in dental equipment, surgical instruments, bone implants, and marine components, and serves as an engine material in high-temperature environments. Because of its lighter weight compared to steel, titanium has also replaced stainless steel in many construction materials. In Bangka Island, Indonesia, tin tailings have been identified as a potential source of titanium, making the analysis of titanium in these tailings highly significant. This study employed the froth flotation method, known for its simplicity, speed, and cost-effectiveness, to analyze titanium content from tin tailings. Sodium oleate was used as the frother and collector, while sodium chlorate acted as the depressant. The mass ratios of depressant to collector were varied at fixed collector amounts (1:10, 5:10, 10:10, and 15:10) and fixed depressant amounts (10:3, 10:6, 10:9, and 10:12). The highest titanium concentration (2.03%) was achieved with a mass ratio of 10:12, while the optimal titanium recovery (45.51%) in the concentrate occurred with equal amounts (3.75 g) of depressant and collector, or at a mass ratio of 10:10, at 15 minutes of flotation time and neutral pH. X-ray fluorescence (XRF) and X-ray diffraction (XRD) analyses indicated that the tin tailings primarily contained silicate and zircon minerals, with traces of titanium in the form of rutile, ilmenite, and titanate. These findings contribute valuable insights for future titanium extraction and processing industries.
Pengaruh Pembelajaran Daring Melalui Whatsapp Terhadap Hasil Belajar Siswa Pada Mata Pelajaran Matematka di SDN 79 Kota Bengkulu Sundari, Rita; Ansyah, Edi; Sutrisno, Hengki
JPT : Jurnal Pendidikan Tematik Vol 2 No 3 (2021): Desember
Publisher : Yayasan Darussalam Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62159/jpt.v2i3.349

Abstract

Pembelajaran daring adalah merupakan sebuah inovasi pendidikan yang melibatkan unsur teknologi informasi dalam pembelajaran. Hasil belajar adalah kemampuan yang diperoleh anak setelah melalui kegiatan belajar. Belajar itu sendiri merupakan suatu proses dari seseorang yang berusaha untuk memperoleh suatu bentuk perubahan perilaku yang relatif menetap. Penelitian bertujuan untuk mengetahui apakah ada pengaruh pembelajaran daring melalui whatsapp terhadap hasil belajar siswa pada mata pelajaran matematika di SD Negeri 79 Kota Bengkulu. Variabel penelitian ini terdiri dari variabel bebas yaitu pembelajaran sistem daring variabel (X) dan variabel terikat yaitu hasil belajar variabel (Y). Jenis penelitian ini yaitu kuantitatif dengan pendekatan ekspo facto. Teknik pengambilan sampel dalam penelitian ini adalah non-probability sampling. Sampel penelitian sebanyak 26 orang dari 102 orang populasi. Teknik pengambilan datanya yaitu angket dan dokumentasi teknik analisis data yang digunakan adalah uji T. Hasil penelitian menunjukkan bahwa berdasarkan uji T diketahui bahwa nilai thitung = 5,127 dan nilai ttabel pada taraf signifikan α = 0,05 dan dk = 26-2 = 24, = 2,064 lebih besar dari rtabel, 5,127 ≥ 2,064, yang artinya nilai tersebut sginifikan dan ada hubungan atau pengaruh antara variabel X dan variabel Y yaitu sebesar 5,127. Sementara itu, persamaan regersi linier atau sumbangan pengaruh untuk variabel X (pembelajaran sistem daring) dan variabel Y (hasil belajar) dapat dilihat dari persamaan regresi linier. Dari hasil hitung, didapatkan nilai persamaan regersi linier sebesar -1,003
PYROMETALLURGICAL PROCESS FOR ZINC ANALYSIS IN SPHALERITE APPLYING XRD AND XRF Dahani, Wiwik; Kurniawati, Riskaviana; Sundari, Rita; Marwanza, Irfan; Rachman, Faisal
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1525

Abstract

This paper has analyzed dominant zinc element in sphalerite naturally found together with galena in mineral ore. Since pyrometallurgical route related to roasting process is very common to mineral dressing, therefore, this investigation has studied the effect of varied roasting time (30 min, 60 min, and 90 min) and temperature (500oC, 600oC, and 700oC) on zinc mineral examination using XRD (X-Ray Diffraction) and zinc element using XRF (X-Ray Fluorescence) analyses. Previous studies usually applied cheaper AAS (Atomic Absorption Spectrometer) for zinc analysis in aqueous solution, however, sphalerite is a solid matrix and therefore, this study has applied XRF to analyze zinc. Pyrometallurgical process of zinc mineral in sphalerite is related to mineral transformation in the form of ZnSO4, ZnS, and ZnO that cannot be detected by XRF. Therefore, this study has used XRD that can observe mineral transformation.   The XRD pattern shows four intense peaks at 2θ (28o, 47o, 56o, and 76o) justified sphalerite (ZnS) sample with little amount of pyrite (FeS2) and galena (PbS) as impurities. The XRF analysis shows from 30 min to 90 min, the Zn content has increased remarkably at 700oC and Zn content looked stagnant at 500oC, while Zn content increased dramatically from 60 min to 90 min at 600oC. During roasting process at high temperature, ZnS mineral converted to ZnO and expelled SO2 gas due to oxidation reaction causing weight reduction. The study is valuable for mineral processing in searching for optimization.
EFFECT OF ACID CONCENTRATION AND ROTATION RATE ON PB LEACHING FROM GALENA ORES Sundari, Rita; Dahani, Wiwik; Marwanza , Irfan; Subandrio, Subandrio; Herdiyanto, Rizky B.
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1583

Abstract

This research is related to lead (Pb) leaching from galena ores using acid leaching method. The galena ores have been treated through pyrometallurgy method by roasting at 600oC 1h to yield galena concentrate. The Pb concentration has been determined by AAS (Atomic Absorption Spectrophotometry) using acid leaching method. This study has observed the effect of leaching acid concentration (acetic and sulfuric acids) and rotation rate on Pb leaching at 50oC 45 min. This study shows that varied acetic acid concentrations gave more effect on Pb extraction. Optimum condition achieved for 2.0 M acetic acid for all given rotation speeds (200 rpm, 300 rpm, and 400 rpm). For sulfuric acid leaching, optimum condition achieved at 1.0 M H2SO4 at 400 rpm. From the results, it is apparent that varied rotation speed (200 rpm, 300 rpm, 400 rpm) gave lesser effect on Pb leaching rather than varied acid concentration effect (0.5 M, 0.75 M, 1.0 M, 2.0 M, and 3.0 M).  In addition, the XRF (X-Ray Fluorescence) analysis on galena ores shows the existence of lanthanum, ytterbium, and europium (rare earth elements) in significant amount since rare earth elements displays important role in modern industry for nuclear battery, dental apparatus, microchips, hybrid vehicles, catalyst for cracking, audio device, and ceramic agent. Statistical and numerical analysis are briefly included in this study to determine the dominant factor and process optimization.
Co-Authors Ansyah, Edi Arifin, Khuzaimah Asadullah, Mas'ud Darren, Franko Sajow Faisal Rachman Herdiyanto, Rizky B. Irfan Marwanza Irwansyah, Dandi Kurniawati, Riskaviana Marwanza , Irfan Meidawati Suswandari, Meidawati NURUL AZIZAH Rinaldi, Ali Rini Anggraini, Rini Sagir Alva Subandrio, Subandrio Sudiono Sudiono, Sudiono Sutrisno, Hengki wiwik dahani, wiwik Yuhanida Milhani