Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1994-05-23
1995-12-19
Langel, Wayne
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
106 1826, 423158, 423173, 423274, 423635, 423639, C01F 514, C01F 520
Patent
active
054766427
ABSTRACT:
Magnesium hydroxide of the formula Mg(OH).sub.2 having a crystallite size in the direction <004> greater than 150 .ANG. and smaller than 500 .ANG., an aspect ratio in the range from 2 to 5, a strain in the direction <004> not greater than 4.2.times.10.sup.-3 and a strain in the direction <110> 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.
REFERENCES:
patent: 4145404 (1979-03-01), Miyata et al.
patent: 4695445 (1987-09-01), Makaya et al.
patent: 5143965 (1992-09-01), Mertz
Bezak Stefan
Kukova Eve
Lencses Ladislav
Skubla Pavol
Duslo, a.s.
Langel Wayne
Rauchfuss, Jr. George W.
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