周秋生1， 丁安平2，李光柱2， 李 明2
(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 山西分公司技術(shù)中心，
河津 043300)
摘 要: 對(duì)高濃度鋁酸鈉溶液碳酸化分解過程中Na2O的析出行為和產(chǎn)品中Na2O的存在形式進(jìn)行了實(shí)驗(yàn)研究。 結(jié)果表明： 溶液中NaAl(OH)4的過飽和度是高濃度鋁酸鈉溶液碳酸化分解的主要?jiǎng)恿Γ⒅苯佑绊懏a(chǎn)品中吸附堿和晶間堿含量水平； 提高分解溫度、 添加晶種或鉀堿均可以明顯降低產(chǎn)品的Na2O含量；表面吸附和晶間夾雜存在的可洗堿一般占?xì)溲趸X產(chǎn)品中Na2O含量的20%~30%， 而晶格堿和含堿化合物雜質(zhì)等不可洗堿是產(chǎn)品中Na2O的主要存在形式。
關(guān)鍵字: 碳酸化分解; Na2O; 析出行為
LIU Gui-hua1, ZHOU Qiu-sheng1, DING An-ping2,
LI Guang-zhu2, LI Ming
（1. School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China;
2. The Technological Center of Shanxi Branch,
China Aluminum Ltd, Hejin 043300, China）
Abstract:Nowadays the Al2O3 content in the sodium aluminate solution is generally not more than 110g/L in the industrial production, which has become one of the primary factors restricting the equipment productivity, while soda is still one of the primary impurities influencing the quality of the product in sintering process and Bayer-sintering combining process. The experimental research on the carbonization precipitation of sodium aluminate solution with high content Al2O3 (170~190g/L) is carried out. It is demonstrated that the soda pick-up behavior is mainly determined by the liquor super-saturation and the experimental result indicates that the Na2O content in Al(OH)3 can be reduced by increasing precipitation temperature or adding seeds. Finally the existence formation of Na2O in aluminum trihydroxide is also investigated.
Key words: carbonization precipitation; soda; pick-up behavior
