Abstract: A composition to control acid rock drainage is provided. The composition includes a slurry made from water and solids, the solids containing powders of limestone, clay and magnesium oxide or magnesium hydroxide. In some instances, the slurry is thixotropic and contains between 10 to 75 weight percent of solid powders. The solid powders can include between 40 to 75 weight percent limestone, 10 to 35 weight percent clay and 10 to 30 weight percent magnesium oxide or a proportional concentration of magnesium hydroxide.

Abstract: A composition to control acid rock drainage is provided. The composition includes a slurry made from water and solids, the solids containing powders of limestone, clay and magnesium oxide or magnesium hydroxide. In some instances, the slurry is thixotropic and contains between 10 to 75 weight percent of solid powders. The solid powders can include between 40 to 75 weight percent limestone, 10 to 35 weight percent clay and 10 to 30 weight percent magnesium oxide or a proportional concentration of magnesium hydroxide.

Abstract: A composition to control acid rock drainage is provided. The composition includes a slurry made from water and solids, the solids containing powders of limestone, clay and magnesium oxide or magnesium hydroxide. In some instances, the slurry is thixotropic and contains between 10 to 75 weight percent of solid powders. The solid powders can include between 40 to 75 weight percent limestone, 10 to 35 weight percent clay and 10 to 30 weight percent magnesium oxide or a proportional concentration of magnesium hydroxide.

Abstract: The present invention is a colorimetric method, and kit therefore, for determining the level of elemental contaminants in a water source. In a preferred embodiment, the method comprises: (a) sampling a discrete amount of water to be tested, (b) contacting the water sample with a solid material having high specificity for reversibly binding to, or complexing with, the element to be detected, (c) separating the element-containing solid from the water sample, (d) eluting the element from the element-containing solid with an eluting solution, (e) adding a cation-containing solution capable of freeing the element to be detected from the eluting compound, (f) adding a buffer, (g) adding a colorimetric material capable of indicating the amount of metal present in the solution, (h) adding an oxidation-fixing reagent, and (i) estimating the amount of metal in the sample by comparing the solution to provided color standards.

Abstract: A method is disclosed for scrubbing SO.sub.2 and NO.sub.x containing gases with iron sulfide. The reaction proceeds only to the formation of FeS.sub.2 and FeSO.sub.4 without significant formation of sulfur or iron oxide. The reaction products are subsequently regenerated to FeS by heating and can be recycled for further scrubbing operations; elemental sulfur is recovered as a by-product.