Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal Indonesian Mining Journal Indonesian Mining Journal
DESSY AMALIA
R & D Centre for Mineral and Coal Technology
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search
Journal : Indonesian Mining Journal

 1 
EXTRACTION OF POTASSIUM FROM FELDSPAR AND LEUCITE BY TWO DIFFERENT ACTIVATION METH- ODS: MECHANICAL ACTIVATION (MILLING) AND HIGH TEMPERATURE ACTIVATION (ROASTING) AGUS WAHYUDI; DESSY AMALIA; HADI PURNOMO
Indonesian Mining Journal Vol 14 No 2 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 2 June 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No2.2011.496

Abstract

One of the most important elements in fertilizers is potassium that can be devided from felsdpar and leucite minerals. Both are composed of various minerals and need to be separated from its impurities to get the desired minerals. In this research, test of mineral activation was performed using two different methods, namely mechanical activation (milling) and activation that used high temperature (roasting). The results were followed by potassium extraction process through leaching using sulfuric acid 6 N, 20% solids for 2 hours without heating. The best result was obtained from a 60-hour mechanically, activated leucite in leaching condition and conducted without heating. To evaluate potassium dissolution with soil when applied as fertilizer, the test of solubility in citric acid-the analogy of acid humus within soil-was conducted. The product with the best solubility was obtained from a 60-hour milling process. The results show that leucite, activated by milling process, was more easily extracted its potassium. However, further research is still needed to optimize the leachability of potassium extraction.
ALTERNATIVE METHOD OF THE ACTIVATION PROCESS FOR BENTONITE MINERAL DESSY AMALIA; MUCHTAR AZIZ; STEFANUS S. CAHYONO
Indonesian Mining Journal Vol 13 No 3 (2010): INDONESIAN MINING JOURNAL Vol. 13 No. 3 October 2010
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol13.No3.2010.516

Abstract

Biodiesel manufacture usually applies liquid catalyst (homogenic catalyst) that deals with some obstacles, such as difficulty in catalyst product separation as they are in the same liquid phase, corrosive characters, excessive catalyst cannot be reused, and complicated to be handled. An alternative for a better process is solid catalyst as a heterogeneous system between raw material and product. Bentonite has layer structures and a potential to be used as solid catalyst by activation process. Three methods of activation process had been conducted,namely 60°C-heating; 60°C-heating followed by 1 week settling and 2 weeks settlement. Each method was performed in sulphuric acid and the chemical content of Al2O3 and SiO2 was observed. An activated bentonite has a molar ratio of SiO2 and Al2O3 between 6 - 9. All methods resulted in expected molar ratio, but the 2 weeks settlement process without heating provided more significant result which means it performed energy saving compared to other methods.
Co-Authors AGUS WAHYUDI HADI PURNOMO MUCHTAR AZIZ STEFANUS S. CAHYONO