Harmless fixed bed thermolysis system for zinc and cadmium super accumulator plant

Abstract

The invention discloses a harmless fixed bed thermolysis system for zinc and cadmium super accumulator plant. The dried zinc and cadmium supper accumulator plant is in the thermolysis in the thermolysis furnace, the thermolysis gas produced in the thermolysis is treated again and is burnt by the burning comprehensive utilization system, the hot smoke from the burning comprehensive utilization system is used partly for drying the zinc and cadmium super accumulator plant and partly for supplying the heat for the thermolysis furnace, the thermolysis temperature depends on the heat released from the hot smoke produced in the burning of fuel oil, part hot smoke from the burning comprehensive utilization system and the thermolysis and burning reaction of the zinc and cadmium supper accumulator plant in the thermolysis furnace, after the hot smoke from the burning comprehensive utilization system is used for drying zinc and cadmium super accumulator plant, the smoke is purified by the adsorption of the activated carbon and discharged. The thermolysis is adopted, over 90% of cadmium and over 99% of zinc can be fixed in the thermolysis coke, the harmless treatment of the zinc and cadmium super accumulator plant and the energy comprehensive utilization.

Description

technical field [0001] The invention relates to a non-toxic fixed bed pyrolysis system for zinc and cadmium hyperaccumulation plants. Background technique [0002] The heavy metal pollution caused by industrial production activities has gradually spread to the soil, and the soil heavy metal pollution in some areas is showing an increasing trend. According to relevant reports, the area of ​​cultivated land polluted by heavy metals such as mercury (Hg), cadmium (Cd), chromium (Cr), and lead (Pb) in China is 2×10 8 hm, accounting for about one-fifth of the total arable land; the country's annual grain production reduction and pollution economic losses caused by heavy metal pollution are at least 20 billion yuan. In order to achieve a sustainable development strategy, the research on soil heavy metal pollution remediation technology has become a hot spot and difficulty in the prevention and control of environmental pollution. [0003] Soil heavy metal pollution remediation tec...

AI Technical Summary

Problems solved by technology

Taking the heat treatment method as an example, the popular pyrolysis gasification treatment technology at home and abroad is mainly aimed at conventional biomass such as crop straw, but there is little research on the treatment technology of biomass rich in heavy metals and potentially harmful to the environment: in In terms of incineration, Xing Qianguo and others from South China University of Technology conducted exploratory research on the wild plant Osmanthus spp. rich in cadmium (Cd) and lead (Pb). The loss of heavy metals in the bottom ash after incineration is serious, which is not conducive to recovery; in terms of pyrolysis, Catherine Keller et al. conducted exploratory research on Thlaspicaerulescens, a hyperaccumulative plant rich in cadmium (Cd) and zinc (Zn), and found that it is closely related to Pyrolysis can improve the recovery of heavy metals in bottom ash compared to incineration methods in the oxidized state

[0005] But so far, there is no report on the harmless heat treatment technology for zinc and cadmium hyperaccumulation plants at home and abroad.

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