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1. 发明授权

US5476642A Magnesium hydroxide and process for production thereof 失效
标题翻译：氢氧化镁及其生产方法
公开(公告)号：US5476642A
公开(公告)日：1995-12-19
申请号：US247784
申请日：1994-05-23
申请人： Pavol Skubla , Stefan Bezak , Ladislav Lencses , Eve Kukova
发明人： Pavol Skubla , Stefan Bezak , Ladislav Lencses , Eve Kukova
IPC分类号： C01F5/14 , C01F5/20 , C08K3/22
CPC分类号： B82Y30/00 , C01F5/14 , C01F5/20 , C08K3/22 , C01P2002/60 , C01P2004/54 , C01P2004/61 , C01P2004/64 , C01P2006/12 , C01P2006/90 , C08K2201/016
摘要： Magnesium hydroxide of the formula Mg(OH).sub.2 having a crystallite size in the direction greater than 150 .ANG. and smaller than 500 .ANG., an aspect ratio in the range from 2 to 5, a strain in the direction not greater than 4.2.times.10.sup.-3 and a strain in the direction not greater than 3.0.times.10.sup.-3. 50% of secondary particles with diameters smaller than 1.4 .mu.m and 100% of secondary particles with diameters not greater than 4.0 .mu.m, and a specific surface, determined by the BET method, smaller than 25 m.sup.2 /g. It is prepared by a two-step procedure; in the first step, magnesium nitrate is treated by an alkaline substance, preferably by ammonia, in an aqueous medium, with 1.5 to 6.0-multiple excess of ammonia, at a temperature of not more than 85.degree. C., at the atmospheric pressure, causing that basic magnesium nitrate is formed which, in the second step, decomposes at a temperature of 110.degree. to 150.degree. C. and at a pressure not greater than 1.5 MPa. It is profitable to use 3.0 to 5.0-multiple excess of ammonia at a temperature of 50.degree. to 75.degree. C. and to decompose the nitrate at a temperature of 120.degree. to 130.degree. C. at a pressure of 0.3 to 1.3 MPa.
摘要翻译：方向大小为150以上且小于500的微晶尺寸的Mg（OH）2的氢氧化镁，纵横比在2至5之间，方向不是大于4.2×10 -3，方向<110>的应变不大于3.0×10 -3。 50％的直径小于1.4μm的二次粒子和100％的直径不大于4.0μm的二次粒子，通过BET法测定的比表面积小于25m 2 / g。它是通过两步法制备的; 在第一步骤中，在大气压下，在不高于85℃的温度下，在含水介质中，用1.5〜6.0倍多的氨处理硝酸镁，优选用氨水，导致形成碱性硝酸镁，其在第二步中在110℃至150℃的温度和不高于1.5MPa的压力下分解。在50〜75℃的温度下使用3.0〜5.0倍的氨，在0.3〜1.3MPa的压力下，在120〜130℃的温度下分解硝酸盐是有利可图的。

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