PROCESS FOR PRODUCTION OF POLY(ALUMINUM-INORGANIC MONOBASIC ACID SALT HYDRATE) AND/OR AQUEOUS ALUMINA SOL, AND POLY(ALUMINUM INORGANIC MONOBASIC ACID SALT HYDRATE) AND/OR AQUEOUS ALUMINA SOL OBTAINED BY THE PROCESS

摘要

A process for producing a poly(aluminum-inorganic monobasic acid salt hydrate) and/or an aqueous alumina sol which have high binder performance from a raw material alumina having ?- and ?- crystal structures at a high degree of conversion to an objective product. A poly(aluminum-inorganic monobasic acid salt hydrate) and/or an aqueous alumina sol which have high binder performance can be produced at a high degree of conversion by subjecting a liquid preparation to aging and/or hydrothermal reaction at a temperature of 40 to 250°C, said liquid preparation being a preparation which consists of an alumina having ?- and ?-structures and a median particle diameter (D50) of 5µm or below, water, and an inorganic monobasic acid or a salt thereof and in which the inorganic monobasic acid/alumina molar ratio is adjusted to 0.03 to 2.0 and the alumina concentration is adjusted to 3 to 50wt%.  Further, the particle shape of aqueous alumina sol can be controlled to a plate-, tape- or fiber-like shape.