周秋生1, 丁安平2， 李 明2， 劉業(yè)翔1
(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院， 長沙 410083；
2. 中國鋁業(yè)股份有限公司 山西分公司， 河津 043300)
摘 要: 為對高濃度鋁酸鈉溶液碳酸化分解過程中產(chǎn)品雜質(zhì)含量的控制提供理論依據(jù)， 分析了鋁酸鈉溶液碳酸化分解過程的熱力學(xué)， 認(rèn)為該過程中Al(OH)3析出的真正機理是過飽和鋁酸鈉溶液的自發(fā)結(jié)晶； 而基于分解過程中平衡濃度的熱力學(xué)計算表明， 在碳酸化分解過程中SiO2的變化規(guī)律與公認(rèn)的三段變化規(guī)律一致， 說明該過程產(chǎn)品中SiO2的含量取決于它在溶液中的平衡濃度， 而非吸附所致； 同時還分析了絲鈉鋁石的形成熱力學(xué)。
關(guān)鍵字: 鋁酸鈉溶液; 碳酸化分解; 熱力學(xué); 機理
aluminate solution
LIU Gui-hua1, ZHOU Qiu-sheng1, DING An-ping2, LI Ming2, LIU
（1. College of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China;
2. Shanxi Company, China Aluminium Corporation Ltd, Hejin 043300, China）
Abstract:The mechanism of carbonization process of aluminate solution was analyzed thermodynamically. The results show that the internal reason of precipitation of Al(OH)3 in the process is its spontaneous nucleation caused by supersaturation of aluminate solution. The behaviors of SiO2 in the process are in accordance with that from published experiment, which implies that the content of product SiO2 from carbonization depends on its solubility but is not the result of absorption. The thermodynamic calculation for forming Na2O·Al2O3·2CO2· nH2O was achieved.
Key words: aluminate solution; carbonization; thermodynamics; mechanism
