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All Journal Jurnal RISET Geologi dan Pertambangan Jurnal Zeolit Indonesia Jurnal Keramik dan Gelas Indonesia Jurnal Keramik dan Gelas Indonesia
Rifki Septawendar
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Materials Science & Nanotechnology

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Sifat Fisik Lempung Tanjung Morawa Dalam Transformasi Fasa Mineral Berdasarkan Investigasi Difraksi Sinar X Rifki Septawendar
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 17, No 1 (2007)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.859 KB) | DOI: 10.14203/risetgeotam2007.v17.141

Abstract

ABSTRAK Investigasi transformasi fasa mineral terhadap sifat fisik lempung Tanjung Morawa sebelum dan setelah proses pembakaran telah dilaksanakan dengan metode Difraksi Sinar X. Sebelum proses pembakaran, dilakukan uji pendahuluan terhadap lempung Tanjung Morawa seperti analisis kimia dan analisis keplastisan untuk mendukung hasil XRD; serta uji termal benda coba setelah dibakar pada suhu 11000C dan 12000C seperti susut bakar, kuat lentur bakar dan peresapan air. Adapun besar butir lempung yang digunakan dalam penelitian ini adalah lolos 80 mesh. Hasil uji pendahuluan menunjukkan; bahwa berdasarkan investigasi XRD, lempung Tanjung Morawa sebelum dibakar mengandung mineral felspar, haloysit, montmorillonit, kuarsa dan mika. Sedangkan pada pembakaran suhu 11000C dan 12000C, lempung Tanjung Morawa mengalami perubahan fasa mineral utama terhadap mullit, kristobalit dan α-kuarsa; dengan perbandingan intensitas peak/puncak yang berbeda. Perubahan ini pula akan mempengaruhi sifat fisis terhadap produk hasil bakar, antara lain: kuat lentur akan meningkat sebanding dengan peningkatan jumlah mullit dan kristobalit. Harga susut bakar akan meningkat disertai dengan penurunan peresapan air. Kuat lentur bakar, susut bakar dan peresapan air pada suhu bakar 11000C secara berturut-turut 435,91 kg/cm2; 10,29 %; dan 2,12 %. Sedangkan kuat lentur bakar, susut bakar dan peresapan air pada suhu bakar 12000C secara berturutturut 635,92 kg/cm2; 10,80 %; dan 0,37 % 
IMPROVEMENT REFRACTORY QUALITY OF ALUMINA SILICATE FOR BRASS SMELTING WITH INFILTRATION TECHNIQUE Ferli S. Irwansyah; Juliandri Juliandri; Iwan Hastiawan; Soewanto Rahardjo; Rifki Septawendar
Jurnal Zeolit Indonesia Vol. 9 No. 1 (2010)
Publisher : Jurnal Zeolit Indonesia

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Abstract

Requirement of refractory materials for manufacturing industry and metal smelting is increasing along technology development. Brass smelting needs a larger size ceramic crucible which is known by the name "kowi". Therefore, it needed a refractory material from local raw materials are higher quality, which has a low porosity, high density, and high mechanical strength. In this study was conducted increasing refractory quality of alumina silicate as a material for manufacturing a brass smelting kowi by infiltration technique. The raw materials such as kaolin, alumina, and magnesium oxide that has been determinate composition were brooded, printed, half-baked burned, infiltrated with a various concentrations, and then burned again, physical and chemical characteristic testing, and also used a Scanning Electron Microscope (SEM) to show morphology of refractory alumina silicate that have been infiltrated. The result showed that refractory alumina silicate was increase the qualities with porosity value of 11,36%, density value of 2,34 kg/m3, water absorbent of 4,85%, and mechanical strength of 129,072 kg/cm2 which can be used as "kowi" material for brass smelting industry.
hal depan jkgi vol.30 no.1 rifki septawendar
Jurnal Keramik dan Gelas Indonesia Vol 30, No 1 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i1.7169

Abstract

hal belakang jkgi vol.30 no.1 rifki septawendar
Jurnal Keramik dan Gelas Indonesia Vol 30, No 1 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i1.7173

Abstract

hal belakang jkgi vol.30 no.1 rifki septawendar
Jurnal Keramik dan Gelas Indonesia Vol 30, No 1 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i1.7173

Abstract

hal depan jkgi vol.30 no.1 rifki septawendar
Jurnal Keramik dan Gelas Indonesia Vol 30, No 1 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i1.7169

Abstract

Co-Authors Ferli S. Irwansyah Iwan Hastiawan Juliandri Juliandri Soewanto Rahardjo