Document Details

Document Type : Article In Journal 
Document Title :
Extraction of Alumina from Local Clays by Hydrochloric Acid Process
إنتاج الألومينا من الطفلة الوطنية بالمعالجة بحامض الأيدروكلوريك
 
Document Language : English 
Abstract : A bench work study was carried out to investigate the use of kaolinitic clay containing 29.4% Al2O3 extremely abundant in Saudi Arabia for the production of pure alumina by calcination at 700oC for 1h (recommended by previous investigators) then leached by hydrochloric acid. The effects of leaching temperature (25oC to boiling temperature), period of activation (10-150 minutes), acid concentration (1M – 6M), particle size (–8 to –200 standard Tyler screen mesh), acid to clay weight ratio (4:1 to 15: 1ml acid/gm clay) on alumina extraction were investigated. The recommended leaching conditions are: 6 molar for acid concentration at boiling conditions under reflux, one hour for leaching time, –100 mesh standard Tyler screens for particle size of calcined clay and 10 ml acid/gm clay for acid to clay weight ratio. Leaching this local clay sample under these conditions resulted in 32% alumina extraction. Local kaolinitic clay were calcined at temperatures varying between 400oC and 800oC at different calcination periods (5 to 120 minutes). The calcined clay was then leached with 3M HCl acid under the above-recommended leaching conditions. The optimum calcination conditions were 600oC and 1 hour for calcination temperature and time period, respectively. The corresponding alumina extraction from local clay sample is about 63%. 
ISSN : 1319-1047 
Journal Name : Engineering Sciences Journal 
Volume : 20 
Issue Number : 2 
Publishing Year : 1430 AH
2009 AD 
Article Type : Article 
Added Date : Tuesday, February 2, 2010 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عبدالرحيم أحمد عمر الزهرانيAl-Zahrani, Abdurraheem A.ResearcherDoctorate 

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