Patent
Method of making a pigment based on calcium carbonate and silicium dioxide usable as filler for paper
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TLDR
In this article, a method for preparing a mixed pigment of calcium carbonate and silica, useful as a filler for paper, was described, in which lime milk and an aqueous sodium silicate solution are mixed and the temperature of the mixture is raised to 55-170 DEG C, and thereafter carbon dioxide is supplied to the mixture until the pH falls to 7 or below.Abstract:
The invention relates to a method for preparing a mixed pigment of calcium carbonate and silica, useful as a filler for paper In accordance with the method, lime milk and an aqueous sodium silicate solution are admixed and the temperature of the mixture is raised to 55-170 DEG C, and thereafter carbon dioxide is supplied to the mixture until the pH of the mixture falls to 7 or below, thus precipitating a mixed pigment comprising calcium carbonate and silicaread more
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The use of calcium carbonate in an acidic aqueous media
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