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PEMECAHAN SENYAWA KOMPLEKS DALAM KAOLIN DAN PENGAMBILAN ALUMINA DENGAN METODE KALSINASI DAN ELUTRIASI

Jurnal Teknologi Technoscientia Vol 2 No 1 (2009): Vol 2 No 1 Agustus 2009
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

Caolin or chines clay seldom used in industry, is formed of very little particles especially caolinite, i.e. a mixture of aluminum oxyde (Al2O3), silika oxyde (SiO2) and wa-ter (H2O). Each composition posseses a different characteristic. The article discusses a separation alumina from caolin which was from Semin, Klaten, the midle of Java, by cal-cination and elutriation methods. The calcination method is a separation one by breaking the bond between the substances using heat. In this case, it was used 800oC because at this temperature it reached vitrification point and the complex bond was broken. The sam-ple was dried under the sun, crushed, and screened by multiple screening i.e. 200 mesh, 230 mesh, 270 mesh, 325 mesh and 400 mesh. From the screening process it was ga-thered fraction between 325 and 400 mesh as the most one, therefor this farction was us-ed as a sample. This one then was elutriated with fluid terminal velocity was varied. It was obtanied that the concentration of alumina incresed relatively high at the fluid velovity of 0.1278 cm/s and 0.2117 cm/s i.e. the alumina concentration increased of 5,2% dan 7,4% became 76.81%.

ETANOL DARI UMBI KAYU DAN KARAKTERISASI CAMPURANNYA DENGAN BENSIN SEBAGAI SUBSITUTUSI BENSIN

Jurnal Teknologi Technoscientia Vol 2 No 2 (2010): Vol 2 No 2 Februari 2010
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

The mixture of etanol and gasoline which is called bioetanol could be an alternatif for fuel. An etanol could be made of cassava. This article discusses a further development of ethanol production and its blend with gasoline and its characterization as a fuel. The experimental work was devided into three steps, i.e. material preparation, fermentation, and finally distillation at 80, 95 and 110 0C. The destillitation resulted a 95% ethanol and the conversion of carbohydrate to ethanol was about 93- 98%. The analysis results of the blend of gasoline and ethanol such as kynematic viscosity 100 oF at temperatures of 40 and 60 oC was 8,645 cSt dan 8,151 cSt respectively and the specific grafity at temperatures of  40 and 60 oC 0,7472 dan 0,743 respectively. The flame test of the blending of gasoline: ethanol volume of  9:1 and the 100 % gasoline results showed that the flame of bioethanol (9 :1) was about 39-40 second which was 4-6 second longer than the 100 % gasoline that the flame was about 34-35 second.