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• Methods for producing alumina from clay :an evaluation of five hydrochloric acid processes
• Methods for producing alumina from clay :an evaluation of the sulfurous acid-caustic purification process
• Methods for producing alumina from clay :an evaluation of three sulfuric acid processes
• Methods for producing alumina from clay :an evaluation of a nitric acid process
• Methods for producing alumina from clay :an evaluation of two ammonium alum processes