碳分法制备易溶氢氧化铝研究  

Study on synthesis of easing soluble aluminum hydroxide by carbonation decomposition

作　　者：韩东战[1] 樊大林[1] 尹中林[1] 

机构地区：[1]中国铝业股份有限公司郑州研究院,河南郑州450041

出　　处：《无机盐工业》2015年第6期47-49,共3页Inorganic Chemicals Industry

摘　　要：通过无晶种碳分法制备了易溶氢氧化铝。研究了反应温度、通气速度、二氧化碳体积分数、铝酸钠溶液苛性比（氧化钠与氧化铝物质的量比）等条件对氢氧化铝酸溶率的影响。适宜工艺条件：反应温度为65-75℃、通气速度为400L/h、二氧化碳体积分数为30%-38%、铝酸钠溶液苛性比为1.48。在此条件下制得氢氧化铝酸溶率大于95%。X射线衍射（XRD）和扫描电镜（SEM）表征表明,物相组成是影响氢氧化铝产品酸溶性的主要原因。The easily soluble aluminum hydroxide was prepared by carbonation decomposition.The effects of decomposition temperature, gas passing velocity, volume fraction of CO2, and caustic molar ratio （amount-of-substance ratio of sodium oxide to alumina） of sodium aluminate solution etc.on the aluminum hydroxide＇s acid solubility were investigated.Results showed that the optimum conditions ： the carbonation decomposition temperature was 65-75 ~C, gas passing velocity was 400 L/h, the volume fraction of CO2 was 30%~38% ,and the caustic molar ratio of sodium aluminate solution was 1.48.The acid soluble rate of the product was more than 95% under those conditions.The product was characterized by XRD and SEM, and the re- sults showed the acid solubility mainly depended on the phase composition of aluminum hydroxide.

关 键 词：易溶氢氧化铝 碳分 二氧化碳 酸溶率 晶体结构 

分 类 号：TQ133.1[化学工程—无机化工]