(1. 中南工業(yè)大學(xué)冶金系，長沙 410083； 2. 中州鋁廠，焦作454174)
摘 要: 研究了氧化鈣、氫氧化鈣與濃堿鋁酸鈉溶液的反應(yīng)特性。在相同條件下，氧化鈣的反應(yīng)活性高于氫氧化鈣，這歸結(jié)于氧化鈣在水化放出大量熱量的同時(shí)，固相顆粒細(xì)化，比表面積增大。較多量的氧化鈣加入反應(yīng)體系后，體系主要因固相顆粒團(tuán)聚容易發(fā)生膨脹。渣相的掃描電鏡分析表明：加入表面活性劑后，表面活性劑可能因吸附“擠占”了新生固相表面吸附的小分子，破壞或削弱了體系的團(tuán)聚，從而消除了體系的膨脹；同時(shí)，表面活性劑的吸附降低了固液界面張力，使顆粒細(xì)化，從而提高了反應(yīng)的比表面積，促進(jìn)了反應(yīng)的進(jìn)行。
關(guān)鍵字: 氧化鈣；氫氧化鈣；鋁酸鈉溶液；反應(yīng)活性
（1. Department of Non-ferrous Metallurgy, Central South University of Technology, Changsha 410083, P.R.China;
2. Zhongzhou Alumina Factory, Jiaozuo 454174, P.R.China）
Abstract:The reaction between calcium oxide or calcium hydroxide and aluminate solution with heavy caustic soda was studied. The reaction activity of CaO was better than that of Ca(OH)2 under the same condition, which was attributed to that the grain size became smaller when the CaO being hydrated, besides the reaction gave out lots of energy and formed a series of active substances. When more amount of CaO was added into the aluminate solution, the slurry's swell changed the system into paste. When some surfactants were added into the reaction system, because the surfactant was adsorbed on the interface between solid and liquid, and the extent of grain agglomeration was reduced, the slurry's swell disappeared. The adsorption of surfactant on the grain stabilized the fine grain, led to increasing the specific surface area and promoting the rate of reaction.
Key words: calcium oxide; calcium hydroxide; aluminate solution; reactivity
