Method for producing granulated porous corundum
    2.
    发明授权
    Method for producing granulated porous corundum 失效
    生产造粒多孔刚玉的方法

    公开(公告)号:US3950507A

    公开(公告)日:1976-04-13

    申请号:US453004

    申请日:1974-03-19

    IPC分类号: C01F7/02 C09C1/68

    摘要: The invention relates to a method for producing granulated porous corundum having a homogeneous porous structure with a total pore volume of 0.3 to 1.0 cm.sup.3 /g and predominant pore size of 5000 to 30000 A. The method comprises subjecting the granules of active alumina or aluminum hydroxide having a porous structure with a total pore volume of 0.3 to 1.0 cm.sup.3 /g and pore size of 20 to 5000 A to heat treatment by increasing the temperature from 20.degree.C to 700.degree.C during a period of at least 0.5 hour, thereafter the granules are heat treated at a temperature range of from 700.degree.C to 1000.degree.C for at least 0.5 hour, and then at a temperature range of from 1000.degree.C to 1400.degree.C for at least 0.5 hour, the heat treatment in the temperature range of from 20.degree.C to 1000.degree.C being carried out in an atmosphere of hydrogen fluoride which is present in amounts of from 0.01 to 2.0 percent of the weight of active alumina. The method of the invention can be effected by carrying out the heat treatment either in a stationary mode, or by a combination of stationary and continuous modes, or in a purely continuous mode. The method permits the use of initial granules of active alumina or aluminum hydroxide having any pore size distribution within the above-specified range; it also prevents the sintering of initial granules when heat treated, thus preventing any decrease in the total pore volume and linear dimensions of the granules and yields a granulated porous corundum having high mechanical strength (crushing strength of up to 160 kg/cm.sup.2). The method requires no sophisticated technology or equipment.

    摘要翻译: 本发明涉及一种具有总孔体积为0.3〜1.0cm 3 / g,主孔径为5000〜30000A的均匀多孔结构的粒状多孔刚玉的制造方法。该方法包括使活性氧化铝或氢氧化铝 具有总孔体积为0.3〜1.0cm 3 / g,孔径为20〜5000的多孔结构,在至少0.5小时内将温度从20℃升温至700℃进行热处理,之后, 将颗粒在700℃至1000℃的温度范围内热处理至少0.5小时,然后在1000℃至1400℃的温度范围内进行至少0.5小时的热处理,在温度 在氟化氢气氛中进行20℃至1000℃的范围,其存在量为活性氧化铝重量的0.01-2.0%。 本发明的方法可以通过以固定模式或通过静态和连续模式的组合或纯连续模式进行热处理来实现。 该方法允许使用任何孔径分布在上述范围内的活性氧化铝或氢氧化铝的初始颗粒; 也可以防止热处理时初始颗粒的烧结,从而防止颗粒的总孔体积和线性尺寸的任何降低,并产生具有高机械强度(高达160kg / cm 2)的破碎强度的造粒多孔刚玉。 该方法不需要先进的技术或设备。