MAGNESIUM HYDROXIDE, METHOD FOR PRODUCING MAGNESIUM HYDROXIDE AND A FIRE RETARDANT COMPRISING THE MAGNESIUM HYDROXIDE, AND A FIRE-RETARDED RESIN COMPOSITION CONTAINING THE MAGNESIUM HYDROXIDE

摘要

Magnesium hydroxide having a large specific surface area is provided. A magnesium-containing matter is chemically decomposed by a solution of acid, and a primary solution of alkali with weak alkalinity is obtained by adding a solution of alkali to the solution of acid, and impurities contained in the primary solution of alkali are eliminated, and a secondary solution of alkali with strong alkalinity is obtained by adding a solution of alkali to the primary solution of alkali, and successively a magnesium hydroxide is deposited in secondary solution of alkali.