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US 5,977,224 AGranted
Roll press grinding aid for granulated blast furnace slag
AssigneeW.R. Grace & Co.-Conn.
InventorsJosephine Ho-wah Cheung, James Michael Gaidis
Life of this patent
Estimating the term…
Abstract
A grinding aid and an enhanced roll press method of grinding granulated blast-furnace slag by treating the slag feed of the roll press with from about 0.002 to 0.2 weight percent of polyacrylic acid or its alkali metal salt in combination with up to about 4 weight percent water.
Claims14
A grinding aid composition useful in grinding granulated blast-furnace slag by a roll press process, comprising:
- [which is comprised of] an aqueous solution having dissolved therein from about 10 to 50 weight percent polyacrylic acid of a weight average molecular weight of at least 25,000 or its alkali metal salts or mixtures thereof;
- and said composition further incorporating an amine comprising a triisopropanolamine, diethanolamine, diethylethanolamine, diethanolethylamine, or a mixture thereof.
A grinding aid composition useful in grinding granulated blast-furnace slag by a roll press process, comprising:
- an aqueous solution having dissolved therein from about 10 to 50 weight percent polyacrylic acid of a weight average molecular weight of at least 25,000 or its alkali metal salts or mixtures thereof;
- said composition further comprising an alkanolamine selected from the group of triisopropanolamine and tertiary alkanolamines comprising diethanolethylamine, diethylethanolamine, or a mixture thereof, said tertiary alkanolamine being water soluble and miscible in said polyacrylic acid aqueous solution;
- said amine and said polyacrylic acid being used in a ratio of 0.1 to 10.
Dependencies are inferred from the claim text.