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Orientation formation of the fire cement mineral phase from Dolomite-Alumina compositions Abdul Rachman; Suhanda Suhanda; Muhammad Syaifun Nizar
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

The formation of the mineral phase of fine cement type mixture of calcium aluminate and magnesium aluminate has been made of a mixture of fine dolomite and alumina materials. The composition defined by cross system comparisons (75, 50, 25 : 25, 50, 75) % with the conditions and constant firing temperature 1200oC. Characterization of the test sample fired product include XRD, chemical analysis, and physical analysis, which showed the formation of the main mineral phases of calcium aluminate, magnesium aluminate and free alumina. The type and level of calcium aluminate phase stability of the composition is varied than magnesium aluminate phase; among the others forming grossit (CaAl4O7) for Al2O3 content of excess (code C) and Ca3Al2O6 for excess CaO constant (code A). Physical properties of the two types of cement fine in succession, the density are 2,0 and 2,5 gr/cm3, the porosity are 24,42 and 52,23 %, pH 10 and 8, the compression strength are 150 and 160 / 2 cm diameter of test pieces. The selected composition (C) is the best of the cement product made of dolomit -alumina. The purpose of the orientation of fire cement mineral phase formation, is to give direction forming system fire cement mixture CA / MA of dolomit alumina in the system (CaO-MgO-Al2O3) is controlled minerology and physics.

Modifikasi Filter Keramik dengan γ-alumina sebagai adsorbent logam berat Eneng Maryani; Suhanda Suhanda; Naili Sofyaningsih; Ayu Ratnaningsih
Jurnal Keramik dan Gelas Indonesia Vol 25, No 2 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Filter keramik adalah filter yang terbuat dari bahan baku keramik. Filter tersebut dapat didesain sedemikian rupa sehingga dapat digunakan untuk menyaring partikel suspensi, koloid, logam berat, ion-ion tertentu, serta mikroorganisme seperti bakteri, kuman, parasit, dan jamur. Pada penelitian ini filter keramik dibuat dari bahan keramik yaitu ball clay, alumina dan karbon yang dibentuk dengan cara slip casting. Untuk meningkatkan daya adsorpsi filter keramik terhadap logam berat maka dilakukan modifikasi filter dengan mengisi adsorben γ–alumina ke dalamnya.Filter tersebut memiliki mikrostruktur mesoporous dengan karakteristik tekstural: dpori rata-rata= 40,410 nm, Vpori total = 0,1146 cc/g dan luas permukaan = 11,348 m2/g untuk filter A serta dpori rata-rata= 29,458 nm, Vpori total = 0,0536 cc/g dan luas permukaan = 7,280 m2/g untuk filter B.Filter keramik dapat menyaring air berlumpur sehingga diperoleh air yang jernih. Filter keramik Aa1 dan Aa2 (diisi adsorben γ–alumina) serta filter B (tanpa diisi adsorben γ–alumina) telah berhasil mengadsorpsi logam berat terutama Pb sehingga diperoleh kadar Pb sampai batas kuantifikasi alat pengukuran. Adsorpsi logam arsen paling baik dilakukan menggunakan filter Aa1 dengan % removal 97,39. Adsorpsi logam kadmium (Cd) paling baik dilakukan menggunakan filter B dengan % removal 99,80. Filter keramik B dapat berfungsi ganda yaitu sebagai filter (penyaring) dan adsorben logam berat.

Effect of Precursor on the Mineralogy and Microstructure Characteristic of Nano Zirconia by Template Method Naili Sofiyaningsih; Suhanda Suhanda; Rifki Septawendar
Jurnal Keramik dan Gelas Indonesia Vol 29, No 1 (2020): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v29i1.6237

Nano zirconia were successfully synthesized from Zr(OH)4 dan ZrOCl2 using a template method. Polyvinyl alcohol was added as a template or a surfactant to control the particle size of nano zirconia. Zirconia precursors were reacted with polyvinil alcohol at a stoichiometric and nonstoichiometric ratio in water solvent at about pH 4 and then calcined at a temperature of 800⁰C. The result showed the precursor types obviously affected the mineralogy and microstructure characteristics of nano zirconia. The reaction between Zr(OH)4 and polyvinyl alcohol produces tetragonal zirconia in the form of nanorods with a diameter of 100 nm and 500 nm - 1μm in length, and elongated agglomerates consisting of nanoparticles less than 100 nm in sizes. Meanwhile, the reaction between ZrOCl2 precursor with polivinyl alcohol at pH 4 leaded to formation of monoclinic zirconia with microstructures such as nanorods with diameter of 10~100 nm and 100~500 nm in length, agglomeration of nanoparticles <100 nm, and packing sheets.

Orientation formation of the fire cement mineral phase from Dolomite-Alumina compositions Abdul Rachman; Suhanda Suhanda; Muhammad Syaifun Nizar
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v26i1.3916

The formation of the mineral phase of fine cement type mixture of calcium aluminate and magnesium aluminate has been made of a mixture of fine dolomite and alumina materials. The composition defined by cross system comparisons (75, 50, 25 : 25, 50, 75) % with the conditions and constant firing temperature 1200oC. Characterization of the test sample fired product include XRD, chemical analysis, and physical analysis, which showed the formation of the main mineral phases of calcium aluminate, magnesium aluminate and free alumina. The type and level of calcium aluminate phase stability of the composition is varied than magnesium aluminate phase; among the others forming grossit (CaAl4O7) for Al2O3 content of excess (code C) and Ca3Al2O6 for excess CaO constant (code A). Physical properties of the two types of cement fine in succession, the density are 2,0 and 2,5 gr/cm3, the porosity are 24,42 and 52,23 %, pH 10 and 8, the compression strength are 150 and 160 / 2 cm diameter of test pieces. The selected composition (C) is the best of the cement product made of dolomit -alumina. The purpose of the orientation of fire cement mineral phase formation, is to give direction forming system fire cement mixture CA / MA of dolomit alumina in the system (CaO-MgO-Al2O3) is controlled minerology and physics.

Modifikasi Filter Keramik dengan γ-alumina sebagai adsorbent logam berat Eneng Maryani; Suhanda Suhanda; Naili Sofyaningsih; Ayu Ratnaningsih
Jurnal Keramik dan Gelas Indonesia Vol 25, No 2 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v25i2.2665

Filter keramik adalah filter yang terbuat dari bahan baku keramik. Filter tersebut dapat didesain sedemikian rupa sehingga dapat digunakan untuk menyaring partikel suspensi, koloid, logam berat, ion-ion tertentu, serta mikroorganisme seperti bakteri, kuman, parasit, dan jamur. Pada penelitian ini filter keramik dibuat dari bahan keramik yaitu ball clay, alumina dan karbon yang dibentuk dengan cara slip casting. Untuk meningkatkan daya adsorpsi filter keramik terhadap logam berat maka dilakukan modifikasi filter dengan mengisi adsorben γ–alumina ke dalamnya.Filter tersebut memiliki mikrostruktur mesoporous dengan karakteristik tekstural: dpori rata-rata= 40,410 nm, Vpori total = 0,1146 cc/g dan luas permukaan = 11,348 m2/g untuk filter A serta dpori rata-rata= 29,458 nm, Vpori total = 0,0536 cc/g dan luas permukaan = 7,280 m2/g untuk filter B.Filter keramik dapat menyaring air berlumpur sehingga diperoleh air yang jernih. Filter keramik Aa1 dan Aa2 (diisi adsorben γ–alumina) serta filter B (tanpa diisi adsorben γ–alumina) telah berhasil mengadsorpsi logam berat terutama Pb sehingga diperoleh kadar Pb sampai batas kuantifikasi alat pengukuran. Adsorpsi logam arsen paling baik dilakukan menggunakan filter Aa1 dengan % removal 97,39. Adsorpsi logam kadmium (Cd) paling baik dilakukan menggunakan filter B dengan % removal 99,80. Filter keramik B dapat berfungsi ganda yaitu sebagai filter (penyaring) dan adsorben logam berat.

Effect of Precursor on the Mineralogy and Microstructure Characteristic of Nano Zirconia by Template Method Naili Sofiyaningsih; Suhanda Suhanda; Rifki Septawendar
Jurnal Keramik dan Gelas Indonesia Vol 29, No 1 (2020): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v29i1.6237

Nano zirconia were successfully synthesized from Zr(OH)4 dan ZrOCl2 using a template method. Polyvinyl alcohol was added as a template or a surfactant to control the particle size of nano zirconia. Zirconia precursors were reacted with polyvinil alcohol at a stoichiometric and nonstoichiometric ratio in water solvent at about pH 4 and then calcined at a temperature of 800⁰C. The result showed the precursor types obviously affected the mineralogy and microstructure characteristics of nano zirconia. The reaction between Zr(OH)4 and polyvinyl alcohol produces tetragonal zirconia in the form of nanorods with a diameter of 100 nm and 500 nm - 1μm in length, and elongated agglomerates consisting of nanoparticles less than 100 nm in sizes. Meanwhile, the reaction between ZrOCl2 precursor with polivinyl alcohol at pH 4 leaded to formation of monoclinic zirconia with microstructures such as nanorods with diameter of 10~100 nm and 100~500 nm in length, agglomeration of nanoparticles <100 nm, and packing sheets.

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