METHOD AND APPARATUS FOR TREATING WASTE INCLUDING CHLORINE-CONTAINING PLASTIC

• Main Authors: TAKEUCHI YOSHIYUKI, ODA NAOYOSHI, FUJITA HARUYOSHI
• Format: Patent
• Language: English
• Published: 28.04.1997
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MAKING GRANULES OR PREFORMS; 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; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PROBLEM TO BE SOLVED: To make it possible to efficiently remove chlorine content from waste by comminuting the waste, separating it into light-duty content and heavy-duty content according to specific gravity difference, and thermally decomposing the heavy-duty content at a specific temperature to be removed. SOLUTION: Plastic mixture containing chlorine-containing plastic and waste containing an inorganic content are first comminuted to a suitable size. The comminuted waste is classified to light-duty content containing light-duty plastic as a main body and heavy-duty content containing heavy-duty plastic and metals as main bodies according to a specific gravity difference in gas or water. Since the separated heavy-duty content is concentrated at the chlorine-containing plastic such as PVC in the waste, it is supplied to thermally decomposing means, and thermally decomposed at 250 to 400 deg.C. Thus, the chlorine content is separated as hydrochloride, and simultaneously slight thermally decomposed gas is generated. The generated hydrochloride, thermally decomposed gas and thermally decomposed residue of solid content are separated. The obtained residue is gasified or heat-treated.