Patent ID: 7604791

Claim:
A recycling method, comprising: a first step of injecting inert gas through an inert gas supply apparatus into a container containing agricultural wastes as an object to be treated and replacing the atmosphere in the container with an oxygen-free atmosphere; a second step of heating the object in the container to a temperature between the boiling temperature of water and 150° C. using a heater preinstalled in the container and controlling the heater so as to provide the temperature of about 150° C. for a period of time sufficient to substantially complete extraction of the water content of the object, while maintaining the oxygen-free atmosphere in the container in order to liberate vapor from the object, and guiding the liberated vapor as a first product to a device outside the container; a third step of heating the object from which all water content has been extracted in the container to a temperature of about 200-350° C. using the heater preinstalled in the container while maintaining the oxygen-free atmosphere in the container in order to liberate chlorine from the object, and guiding the liberated chlorine gas to a device outside the container while maintaining the chlorine gas in a state isolated from the air to obtain the chlorine gas in a fluid state; a fourth step of heating the object in the container to a temperature of no higher than 450° C. using the heater preinstalled in the container while maintaining the oxygen-free atmosphere in the container in order to liberate other gas from the object, and guide the liberated gas to a device outside the container while maintaining the gas in a state isolated from the air to obtain the gas in a fluid state; a fifth step of maintaining the temperature in the container at no higher than 450° C. for a period of time sufficient for providing carbonized object while maintaining the oxygen-free atmosphere in the container; and a sixth step of cooling the inside of the container to a temperature lower than the temperature at which carbonized object will burn while continuously maintaining the oxygen-free atmosphere in the container and obtaining a residue remaining in the container as a second product.