Abstract: A method is shown for recycling asphalt pavement. A high solids lime slurry is prepared by either slaking quicklime or by slurrying dry, hydrated lime. The high solids lime slurry is mixed with crushed aggregate which has been collected by scraping the top surface of an old roadway. The treated aggregate is deposited onto the old roadway and compacted to form a new roadway.

Abstract: A method is shown for improving the properties of hot mix asphalt by treating the aggregate which is combined with bituminous binder with lime. A hot quicklime slurry is produced by slaking quicklime with water at the site of the hot mix asphalt plant using a portable mixing tank. The hot quicklime slurry is then applied to the aggregate, the aggregate is dried and combined with the binder to produce the hot mix asphalt.

Abstract: A method and apparatus for providing a continuous product stream of lime slurry to a job site which is located remote from a permanent lime production plant utilizes a primary and auxiliary tank which are mounted on a portable frame structure. Lime and water are mixed in the primary tank to form a lime slurry. The lime slurry is then introduced into the auxiliary tank. A product stream of lime slurry is drawn from the primary tank until it is depleted. Lime slurry is then drawn from the auxiliary tank to supply a continuous stream of lime slurry to the job site while the primary tank is being refilled with lime and water to form a second lime slurry. The second lime slurry is then introduced into the auxiliary tank so that it is filled again and a second product stream of lime slurry is drawn from the primary tank. The process is repeated until a desired amount of lime slurry is supplied to the job site.

Abstract: An apparatus and method are shown for treating waste sludge. The apparatus includes a mixer housing having an elongated mixing auger therein. The housing has an inlet opening and an outlet opening with the elongated mixing auger being rotatably mounted within the housing between the inlet and outlet openings. A sludge conveyor supplies waste sludge to the inlet opening of the elongated mixer housing. An additive hopper contains an additive material to be combined with the sludge introduced within the mixer housing. A metering auger and series of spaced delivery conduits gradually introduce the additive material over a substantial interval of the mixing chamber beginning at a point downstream of the inlet opening to the mixer housing.

Abstract: An apparatus is disclosed for treating waste sludge. The apparatus includes a mixer housing having an elongated mixing auger therein. The housing has an inlet opening and an outlet opening with the elongated mixing auger being rotatably mounted within the housing between the inlet and outlet openings. A sludge conveyor supplies waste sludge to the inlet opening of the elongated mixer housing. An additive hopper contains an additive material to be combined with the sludge introduced within the mixer housing. A metering auger and series of spaced delivery conduits gradually introduce the additive material over a substantial interval of the mixing chamber beginning at a point downstream of the inlet opening to the mixer housing.

Abstract: A method and formulation are shown for capping the exposed surface of an aggregate of materials, such as exposed land areas with fine particulate mining wastes. A mineral formulation is prepared by mixing together lime, a pozzolanic component, a sulfate component, a cellulosic component and water. The mineral formulation is applied to the exposed aggregate and is allowed to harden to form a surface coating thereon. A seed component or a coloring additive can be incorporated within the slurry for revegetating land areas and to enhance the esthetic appearance of the hardened cap.

Abstract: A method and formulation are shown for capping dust-emitting bulk materials, such as materials being conveyed in open rail cars. A mineral formulation is prepared by mixing together lime, a pozzolanic component, a sulfate component, a fibrous component and water. The mineral formulation is applied to the surface of the dust-emitting bulk material and is allowed to harden to form a surface coating thereon.

Abstract: A method is shown for stabilizing clay bearing soils in which a silica compound is incorporated into the soils in addition to the application of lime. The silica compound can be either an amorphous, silica fume, a crystalline silica, a silica gel, sodium silicate, potassium silicate, finely ground glass or combinations thereof. The silica compound promotes the formation of calcium silicate hydrates over the formation of calcium aluminate hydrates in the resulting pozzolanic reaction occurring in the clay bearing soils. The silica compound and lime can be incorporated into the soils in a single step.

Abstract: An invention is shown in which a quicklime is hydrated in the presence of a special chemical modifier to produce a controlled temperature hydrate having improved plastic properties and greater surface areas.

Abstract: A method is shown for stabilizing sulfate bearing soils in which a silica compound is incorporated into the soils with the soils being further stabilized by the application of lime. The silica compound can be either an amorphous, flume silica, a crystalline silica, a silica gel, sodium silicate, potassium silicate or combination thereof. The silica compound and lime can be incorporated into the soils in a single step.

Abstract: A process is shown where an arc dust waste produced by an electric arc furnace is conducted to silos and converted to a reusable co-product by means of the addition of a special blend of high calcium and dolomitic quicklime, calcium stearate and pulverized waste paper. The mixture is compressed into compact pellets which, due to their impact integrity and improved shelf life can be pneumatically conveyed intact into storage silos for recycling of the waste electric arc flue dust into the furnace melt. Components of the arc dust deemed leachable and hazardous in landfills, such as zinc, lead and chromium are increased in concentration to a point where it is economical to extract them for resale.

Abstract: A method is shown for reducing the swelling action of sulfates in clay bearing soils while increasing the bearing strength values of the soils by treating soils having high sulfate content with a barium containing compound in an amount effective to react with the sulfate present in the soils, thereby forming less soluble reaction products and decreasing the tendency of the soil to form ettringite. The soil is further stabilized by the application of lime.

Abstract: A binder composition is shown for agglomerating ore fines in a heap leaching ore recovery process. The binder composition comprises a calcareous component, a sulfate component and a siliceous-aluminous component such as fly ash. The ore fines are agglomerated by adding the binder composition thereto and a leach bed is formed of the agglomerated ore. The leach bed is leached with a leaching agent to form a leach liquor the metal values are recovered from the leach liquor.