Asbestos treatment with metal sulfides
AssigneeThe Dow Chemical Company
InventorPaul A. Pezzoli
Life of this patent
Estimating the term…
Abstract
A method of treating asbestos comprising depositing on at least a portion of the asbestos a material consisting essentially of at least one metal sulfide.
Claims36
A method of treating asbestos comprising depositing on at least a portion of the asbestos a material consisting essentially of at least one metal sulfide to provide an asbestos material having lower hemolytic activity than the untreated asbestos.
A method for treating asbestos comprising:
- (a) slurrying the asbestos with a sufficient amount of an aqueous solution of an ionizable salt of at least one first metal selected from the group consisting of magnesium, titanium (IV), chromium, iron (II), cobalt, nickel, yttrium, zirconium, silver, zinc, cadmium, aluminum, tin (II), tin (IV), and lead to deposit at least a portion of the ionizable salt of at least one first metal on at least a portion of the asbestos;
- (b) slurrying the asbestos from step (a) with an aqueous solution of a sulfide salt of at least one alkali metal to form a sulfide salt of at least one first metal on at least that portion of the asbestos wherein the ionizable salt of the first metal was deposited.
A fibrous asbestos material consisting essentially of asbestos fibers and at least one metal sulfide deposited on at least a portion of the asbestos fibers, said material further characterized as having reduced hemolytic activity in comparison to asbestos fibers with no metal sulfide deposited thereon.
Dependencies are inferred from the claim text.