公开(公告)号：US4399119A

公开(公告)日：1983-08-16

申请号：US252654

申请日：1981-04-09

Applicant: Shizuo Takumi ,  Toshio Hashimoto ,  Masaru Tatsushima

Inventor： Shizuo Takumi ,  Toshio Hashimoto ,  Masaru Tatsushima

IPC: B01J2/08 ,  B01J21/04 ,  C01F7/02

CPC classification number: C01F7/02 ,  C01P2004/32 ,  C01P2006/22

Abstract: A method of manufacturing spherical alumina particles which comprises the steps of digesting, at an elevated temperature and an elevated pressure, gibbsite with an aqueous hydrochloric acid solution and then forming an aqueous basic aluminum chloride solution; adding, at an elevated temperature, an aqueous ammonia to said aqueous basic aluminum chloride solution to form an alumina hydrosol containing ammonium chloride; commingling said alumina hydrosol with a gelling agent; thereafter dispersing droplets of said mixture in a suspending medium under conditions effective to transform said droplets into hydrogel particles; ageing said hydrogel particles first in said suspending medium and then in aqueous ammonia; and then washing said hydrogel particles with water, drying and calcining to obtain spherical alumina particles.

Abstract translation: 一种制造球形氧化铝颗粒的方法，其包括在高温和高压下用盐酸水溶液消化三水铝沸石，然后形成碱性氯化铝水溶液的步骤; 在高温下加入氨水至碱性氯化铝水溶液中以形成含有氯化铵的氧化铝水溶胶; 用胶凝剂混合氧化铝水溶胶; 然后在有效将所述液滴转变为水凝胶颗粒的条件下将所述混合物的液滴分散在悬浮介质中; 在所述悬浮介质中首先将水凝胶颗粒老化，然后在氨水中老化; 然后用水洗涤水凝胶颗粒，干燥并煅烧，得到球形氧化铝颗粒。