This document is available in the Adobe Acrobat PDF Format. The Sulchem Process mixes the material being treated with elemental sulfur at elevated temperatures in an inert reactor system. Organic hydrocarbons react with the sulfur to form an inert fine solid of carbon and sulfur, hydrogen sulfide gas, and modest a mounts of carbon disulfide.
Heavy metals react to form sulfides or sulfidecoated particles which are less soluble.
The acid gases formed may be scrubbed or treated to recover elemental sulfur using an auxiliary process unit. Cadmium was reduced below TCLP limits when the concentration in the original soil was below several thousand ppm.