کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
213256 462089 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Precipitation of boehmite in sodium aluminate liquor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Precipitation of boehmite in sodium aluminate liquor
چکیده انگلیسی

Gibbsite is generally precipitated from sodium aluminate liquor in the presence of huge quantity of gibbsite seed at a temperature between 60 and 70 °C. This gibbsite is then calcined to produce alumina. Boehmite is a stable phase at higher temperature (> 100 °C) and formation of boehmite below 100 °C in supersaturated sodium aluminate liquor is unusual. In the present study an attempt has been made to produce boehmite under atmospheric pressure conditions. Effect of various parameters such as temperature, alumina/caustic (Al2O3/Na2O) ratio, seed size, amount of seed, organic additives, precipitation time, etc., on boehmite formation has been investigated. At higher temperature and low alumina/caustic ratio, boehmite is found to be precipitated under atmospheric pressure by adding boehmite seed. The optimum quantity of seed required for precipitation has been found to be 300 g L− 1. Reduction in precipitation temperature could be achieved by using different organic additives. Tartaric acid has been found to be highly effective in reducing the temperature of boehmite precipitation to 50 °C. Increase in precipitation time increased boehmite production.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 95, Issues 3–4, February 2009, Pages 297–301
نویسندگان
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