公开(公告)号：US4276052A

公开(公告)日：1981-06-30

申请号：US21205

申请日：1979-03-16

申请人： Egon Boisen Schmidt ,  Josef K. S. Zechner ,  Gosta M. Frang

发明人： Egon Boisen Schmidt ,  Josef K. S. Zechner ,  Gosta M. Frang

IPC分类号： B01D9/02 ,  C01F7/74

CPC分类号： C01F7/746

摘要： A method of crystallizing a solution of aluminium sulphate to form crystal agglomerates having an essentially uniform grain size and being in the form of granules having a characteristic appearance and good storage properties. A solution having a temperature of 105.degree.-115.degree. C. and a concentration of 14.5-16.8% by weight of Al.sub.2 O.sub.3 is brought to crystallize onto a bed of crystalline aluminium sulphate in a drum, the length of which is considerably larger than the diameter, a temperature of 70.degree.-95.degree. C. being maintained in the bed. Part of the crystalline product discharged from the drum is ground and recycled to the drum in an amount of 40-200 percent by weight of added solution and air is passed through the drum to remove moisture evolved by the crystallization so as to form a final product with more than 75% by weight present in the crystalline state and containing 15.0-18.0% by weight of Al.sub.2 O.sub.3.

摘要翻译： 一种使硫酸铝溶液结晶以形成具有基本均匀晶粒尺寸并且具有特征外观和良好储存性能的颗粒形式的结晶聚集体的方法。 将温度为105-115℃，浓度为14.5-16.8％（重量）的Al2O3的溶液在鼓中结晶的硫酸铝床上结晶，其长度远大于直径 在床中保持70〜-95℃的温度。 从滚筒中排出的部分结晶产物被研磨并循环到滚筒中，其量为加入的溶液的40-200重量％，空气通过滚筒以除去通过结晶放出的水分，从而形成最终产物 存在结晶状态的超过75重量％并含有15.0-18.0重量％的Al 2 O 3。