Eric S Goldman

US Patent:

53047109, Apr 19, 1994

Filed:

Feb 18, 1993

Appl. No.:

8/019089

Inventors:

Mark Y. Kigel - East Brunswick NJ
John F. Shultis - Plainsboro NJ
Eric S. Goldman - Metuchen NJ
Mark K. Demytrk - North Bergen NJ

Assignee:

Envar Services, Inc. - Cranford NJ

International Classification:

B09B 300

US Classification:

588257

Abstract:

A method for treating chromium ore waste contaminated soils by detoxification, fixation, immobilization and stabilization comprising the steps of soil grinding, pre-activating, reducing chromium valiancy, forming insoluble metal hydroxides, and incapsulating the chromium compounds containing agglomerates to prevent potential chromium leaching from the soil according with the standard toxicity characteristic leaching procedure requirements. Additive agents such as an acidic solution, a bivalent iron sulfur containing salt, e. g. ferrous sulfate, an alkalifying agent, e. g. calcium lime slurry or lime kiln dust or caustic, a stabilizing agent, e. g. cement, cement kiln dust, silicates, polyelectrolytes, and the like are also disclosed as assisting in the chromium immobilization reactions by reacting with certain constituents in the soil.