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Wiji Mangestiono
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PENGARUH ADITIF ION Cu TERHADAP MORFOLOGI KERAK GIPSUM PADA PIPA BERALIRAN LAMINER DENGAN PARAMETER LAJU ALIR Mangestiono, Wiji
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (350.043 KB) | DOI: 10.14710/metana.v6i2.3855

Abstract

Abstract Parameter in this experimental is flowrate which has some effect on the morfology of cristals  produced  such  as crystal system and crystal size. Study of morfology in this research were needed to justify what kind the crystals is and to know the effects of the adition some aditives. To fullfil this demand analysis of Scaning Electron Microscopy were done and also measurement the mass of crystals. The result of this experiment : the mass of crystals decrease by adition ion Cu2+ five ppm and 10 ppm, but crystal morfology has no difference in its siystem otherwise in its length. Crystal system still orthorhombic. Keywords : crystal, flowrate,morfology, aditive
MICROANALYSIS PEMBENTUKAN KRISTAL CALSIUM SULFAT PADA PIPA BERALIRAN LAMINER DENGAN PARAMETER LAJU ALIR Mangestiono, Wiji
METANA Vol 7, No 01 (2011): Juli 2011
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (223.069 KB) | DOI: 10.14710/metana.v7i01.4028

Abstract

Abstract   Gypsum (CaSO4. 2H2O) scaling inside pipe is very problematic for industries since it causes narrowing of pipe diameter, thickening of heat transfer surfaces, lenghthening the process time and finally increase the cost of production. It is therefore necessary to prevent the occurance of gypsum scaling in a piping system. This report describes an experiment on gypsum scale formation utilizing CaCl2.2H2O and Na2SO4 solutions to form gypsum ( CaSO4. 2H2O). The concentration the calcium ions selected was 3,500 ppm. The experiment was carried out a pipe with several coupons made of copper representing common pipe material used in industry. Flowrate of gypsum solution as one of process parameters for gypsum scaling was varied: 30, 40 and  50 ml/minute  respectively. In addition, Cu2+ as impurities was aded into the solution : 5 and 10 ppm respectively. In adition, a microanalysis on the scale was also caried out using EDAX. The mass of the scale formed was calculated in order to determine the rate of the gypsum scale growth. Keywords : flowrate, gypsum, impurities, piping system.
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