Author:
Baba Alafara A.,Raji Mustapha A.,Muhammed Muhammed O.,Abdulkareem Aishat Y.,Olasinde Fausat T.,Ayinla Kuranga I.,Adekola Folahan A.,Bale Rafiu B.
Abstract
Increasing demands for aluminium and aluminium oxide with diverse industrial applications have prompted the development of a low-cost and eco-friendly technique as a substitute for conventional ore treatments by reduction-roasting route, requiring high energy consumption. For example, the demand for high-grade industrial alumina (Al2O3) as valuable materials in refractories, pigments, adsorbents, catalysis, water purification, aluminium production and metallurgical applications cannot be over emphasized. Thus, the upgrading of a Nigerian biotite-rich kaolinite ore containing admixture of kaolinite (Al2.00Si2.00O9.00: 96-900-9231), biotite (Mg6.55Fe3.46Al5.29Ti1.34Si11.36K4.00O48.00: 96-900-0844) and quartz (Si3.00O6.00: 96-900-9667) impurities by hydrometallurgical route was investigated in phosphoric acid media. During leaching, parameters such as leachant concentration, particle size and reaction temperature on the extent of ore dissolution were accordingly examined. At optimal leaching conditions (2.0 mol/L H3PO4, 75 °C), 87.0% of the initial 10 g/L ore reacted within 120 min. The activation energy of 16.6 kJ/mol supported the diffusion control reaction mechanism. The unreacted product (∼13.0%) analyzed by XRD was found to contain siliceous impurities including iron silicate and manganese silicate which could serve as valuable by-products for some defined industries. The leach liquor at optimal leaching conditions was accordingly treated to obtain pure aluminium solution which was further beneficiated to obtain high-grade alumina (α-Al2O3) of industrial value with 96.3% purity.
Subject
Materials Chemistry,Metals and Alloys,Mechanics of Materials,Computational Mechanics
Reference50 articles.
1. Grimshaw R.W.,
Physics and Chemistry of Clay, 4th ed.
Ernest Benn,
London,
1971, 0510-47701-7
2. Characterization, beneficiation and utilization of a kaolinite clay from Assam, India
3. Wu H.,
Yu J.,
Zhang J.,
Study on crystallinity and order degree of coal-series kaolin from different districts,
Non-Met. Mines 04,
(2010)
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献