THERMAL TREATMENT OF WASTE

• Main Authors: TAKEUCHI YOSHIYUKI, FUJITA HARUYOSHI
• Format: Patent
• Language: English
• Published: 21.04.1998
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BLASTING; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMBUSTION APPARATUS; COMBUSTION PROCESSES; COMPOSITIONS BASED THEREON; CONSUMING WASTE PRODUCTS BY COMBUSTION; CREMATION FURNACES; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MAKING GRANULES OR PREFORMS; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for thermally treating wastes containing chlorine, capable of separating generated hydrogen chloride in high efficiency by subjecting the wastes to a preliminary dechlorination treatment. SOLUTION: This method for thermally treating chlorine-containing wastes comprises heating, preferably thermally decomposing, the wastes at 200-600 deg.C to remove the chlorine. Therein, a gas containing steam in a molar amount of >=0.5 time, preferably >=2 times, that of the contained chlorine is charged to highly efficiently separate the chlorine compounds in the wastes. The employment of an oxygen-short gas, preferably a substantially oxygen-free, oxygen- removed gas, as the steam-containing gas enables to suppress the combustion of combustible materials in the wastes and prevent the production of dioxin.