( 1. 東北大學 材料與冶金學院， 沈陽 110004；
2.中國鋁業(yè)股份有限公司鄭州研究院 氧化鋁研究所， 鄭州 450041)
摘 要: 對我國兩個主要礦區(qū)的鋁土礦進行了雙流法預熱條件下礦漿中含硅礦物及含鈦礦物反應行為的實驗研究， 考察了礦漿固含不同時含硅和含鈦礦物反應行為的變化。在較長的預脫硅時間條件下， 隨著礦漿固含的增加， 預脫硅效率及礦漿液相中的SiO2濃度呈下降的趨勢。在礦漿預熱過程中， 脫硅效率隨著礦漿固含的增加而增加， 當固含增加到一定程度時， 脫硅效率反而下降， 脫鈦效率隨礦漿固含的變化規(guī)律和脫硅效率相同； 礦漿液相中的SiO2濃度隨礦漿固含的增加而下降。 在雙流法預熱條件下， 礦漿固含越高， 礦漿預熱過程中含硅礦物、含鈦礦物及含鎂礦物的結疤速率越低。
關鍵字: 一水硬鋁石型鋁土礦； 雙流法； 礦漿固含； 礦漿預熱； 結疤
two stream process of diasporic bauxite in China
（ 1. School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China;
2. Alumina Research Department, Zhengzhou Research Institute,
Aluminum Corporation of China Limited, Zhengzhou 450041, China）
Abstract: Experimental investigation of reaction behavior of Si-containing and Ti-containing minerals in preheating process of bauxite slurry of two main mining areas in China is carried out under the condition of two stream process. The change of reaction behavior of Si-containing and Ti-containing minerals is investigated with the change of solid content of bauxite slurry. Predesilication efficiency is decreased with the increase of solid content of slurry when the predesilication time is up to a some extent. Desilication efficiency is increased with the increase of solid content of slurry, but is decreased when the solid content of slurry is increased up to a some extent in the preheating process of bauxite slurry. The relationship between reaction efficiency of Ti-containing minerals and solid content of bauxite slurry is as same as that of Si-containing minerals. And SiO-2 concentration in liquor in slurry is decreased with the increase of solid content of slurry in predisication and preheating process of bauxite slurry. The higher the solid content of bauxite slurry, the lower the scale formation of Si-, Ti- and Mg-containing minerals in preheating process under the condition of two stream process of diasporic bauxite in China.
Key words: diasporic bauxite; two stream process; preheating process; reaction efficiency; scale formation
