Chromium-containing solid waste and organic material synergistic pyrolysis harmless treatment device and method

Abstract

The invention discloses a chromium-containing solid waste and organic material synergistic pyrolysis harmless treatment device and method. The device comprises a pyrolysis chamber, a gasification chamber, a combustion chamber and the like. The dried chromium-containing solid waste and organic materials are crushed, mixed and granulated, particles enter the pyrolysis chamber to be pyrolyzed to generate reductive pyrolysis gas and pyrolysis solid, and hexavalent chromium in the chromium-containing solid waste is reduced into trivalent chromium through the pyrolysis gas. Carbon and the like in the pyrolysis solid are subjected to a gasification reaction with water vapor to be converted into synthetic gas, so that residues are reduced, reduced trivalent chromium is prevented from being oxidized again, subsequent chromium recycling is facilitated, and pyrolysis gas and the synthetic gas are finally introduced into the combustion chamber to be combusted to generate high-temperature flue gasto provide heat for the heating chamber. According to the chromium-containing solid waste and organic material synergistic pyrolysis harmless treatment device and method, solid residues are reduced while the chromium-containing solid waste is subjected to harmless treatment, generated gas is clean combustible gas, heat is provided for the system after sufficient combustion, the heat utilization efficiency is improved, and a feasible technical route is provided for harmless, reduction and recycling treatment of the chromium-containing solid waste.

Description

technical field [0001] The invention belongs to the field of harmless reduction treatment of chromium-containing solid waste, and in particular relates to a harmless treatment device and method for collaborative pyrolysis of chromium-containing solid waste and organic materials. Background technique [0002] my country is a big producer of chromium salts, and the amount of chromium-containing solid waste discharged every year is about 700,000 tons or more. Chromium usually exists as Cr(III) and Cr(VI) in the environment. Cr(Ⅵ) is highly toxic and carcinogenic to humans and animals, and its toxicity is 100 times higher than that of Cr(Ⅲ). Due to the lack of awareness of environmental protection and pollution prevention and control measures, most chromium slags are disposed of simply by stockpiling. The highly toxic substance Cr(VI) in chromium slag is leached out by exposure, weathering and rainwater erosion, etc., and enters the nearby soil, water, etc. Pollution, endange...

AI Technical Summary

Problems solved by technology

The traditional chromium-containing solid waste detoxification has the problem of high energy consumption or high cost; the solidification treatment method has a large volume and cannot be further processed and disposed of

For chromium-containing organic solid waste such as chromium-containing sludge, if the incineration method is used, the Cr(Ⅵ) in it cannot be reduced to the less toxic Cr(Ⅲ), and the insoluble Cr(Ⅲ) is easily oxidized to become more soluble The Cr(Ⅵ) content not only increases the toxicity, but also increases the leaching toxicity. For the new pyrolysis technology, the organic components in some chromium-containing solid wastes are low, the reducibility of the pyrolysis process is low, and the energy consumption is high.

At present, there is still a lack of a feasible technical route for the harmless and reduction treatment of chromium-containing solid waste

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