复盐分解法制备固体铝酸钠

为寻找碳分母液中残留氧化铝的最佳利用途径,介绍了复盐分解法制备固体铝酸钠试验,着重进行了碳分母液直接通入CO2气体及添加碳酸氢钠作晶种碳分的对比研究。结果表明,加入碳酸氢钠作为晶种,碳分母液完全碳分产物为比较纯的丝钠铝石,将其在800~900℃焙烧制得比较纯净的固体铝酸钠;而不添加晶种,生成的碳分产物及焙烧后得到的固体铝酸钠中出现杂质氢氧化铝。利用前者,可将碳分母液中15g/L左右的氧化铝,全部转化为固体铝酸钠产品。

Preparing Solid Sodium Aluminates by Break down Double Salt

In order to find the best way to utilize residual Al2O3 in the spent carbonated liquor,this article introduced the experiments of preparing solid aluminates by break down double salt,put emphasis on the comparison tests of direct afflux of CO2 to spent carbonated liquor and adding sodium bicarbonate as crystal seed.The results showed that the offspring of completely carbonating decomposition by adding sodium bicarbonate was pure dowsonite and the products of pure solid sodium aluminate was made by roasting the dowsonite at 800～900 ℃;But the carbonating and roasting offspring that not added crystal seeds contained impurity of Al（OH）3.By the first method,the Al2O3 of about 15 g/L in the spent carbonated liquor could be changed to the product of solid sodium aluminates entirely.