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AssigneeCement-Lock Group, L.L.C.
InventorsRichard L. Kao, Sarabjit S. Randhava, Surjit S. Randhava, Michael C. Mensinger, Amirali G. Rehmat, Anthony L. Lee
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This invention relates to thermo-chemical remediation and decontamination of sediments and soils contaminated with organic contaminants as well as inorganic materials with subsequent beneficial reuse. Novel environmentally stable products of commercial value are produced when certain additives such as calcium and metal oxides are mixed with the contaminated materials. In the process, the mixture is heated to 1150.degree. C..about.1500.degree. C. to produce a molten reaction product with at least part of an excess amount of oxygen mixture or air is continuously bubbled through the melt in order to provide mixing and achieve high thermal destruction and removal efficiencies of the organic contaminants. The melt is then quickly quenched in moist air, steam, or water to avoid the transformation of the amorphous material into crystals. The inorganic contaminants such as chromium, nickel, zinc, etc. are incorporated and completely immobilized within the amorphous silicate network. Atmospheric emissions resulting from this process are nontoxic and capable of meeting currently specified health and environmental requirements. The amorphous material can be pulverized to yield a powder which evinces cementitious properties either by reaction with alkali solution or by blending it with other materials to produce blended cements. The compressive strengths of the concretes made from the powder of the subject invention and blends thereof are comparable to, or greater than the ASTM requirements for general purpose concrete applications. The powder of the subject invention, blended cements, and concrete/mortar derived therefrom also easily pass the EPA TCLP leach test to achieve environmental acceptability.
An environmentally stable substantially non-leaching cement product of a process for thermo-chemical remediation and decontamination of sediments and soils contaminated with organic materials as well as inorganic contaminants and heavy metals, the process comprising the steps of:
A generally homogeneous non-leaching reactive cementitious melt product which is amorphous and comprising:
A blended cement comprising a mixture of portland cement and a reactive melt product, said reactive melt product is a generally homogeneous amorphous non-leaching cementitious melt product comprising CaO, SiO.sub.2, Al.sub.2 O.sub.3, Fe.sub.2 O.sub.3 and CaF.sub.2, the weight ratio of reactive melt product to portland cement being from about 10 parts of reactive melt product to about 90 parts of portland cement up to about 70 parts of reactive melt product to about 30 parts of portland cement, said melt product leaching less than 0.01 mg/L of Cd, and less than 0.05 mg/L of Pb.
Dependencies are inferred from the claim text.