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Fluidized bed type of harmless chromium slag pyrolysis process

A fluidized bed, harmless technology, applied in the field of environmental protection, can solve the problems of reduced reducing gas concentration, reduced reduction efficiency, weak reducing atmosphere, etc., and achieves reduction of cooling time, easy secondary utilization, and shortened reaction time. Effect

Active Publication Date: 2014-08-13
光大理工环境技术研究院(青岛)有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process has many defects. On the one hand, the process adopts the rotary kiln process, and the material stays in the kiln for a long time, so the processing efficiency is low.
On the other hand, since the process mixes organic matter and chromium slag in the low temperature area, during the process of the two moving to the high temperature area, the organic matter in the sludge will continuously produce tar gas and enter the tail gas along the air flow, and the tar gas contains a large amount of such as Carcinogens such as cycloaromatic hydrocarbons are easily discharged in the form of PM2.5 during the cooling process, which is extremely harmful, so secondary treatment is required for the exhaust gas
In addition, the tar gas produced by the organic matter in this process is diluted by the high-temperature gas flow, resulting in a decrease in the concentration of reducing gases in the gas flow, and the reduction atmosphere is not strong, which reduces the reduction efficiency of Cr(VI)

Method used

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  • Fluidized bed type of harmless chromium slag pyrolysis process

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example 2

[0026] 1. Crush the chromium slag, collect particles with a particle size of 0.5-3mm, and transport them to the pyrolysis furnace from the top chromium slag feed port. After passing through the fluidized layer, it reacts with the pyrolysis gas, and Cr(VI) is reduced. At the same time, the pyrolysis residual carbon adheres to the surface of the chromium slag during the fluidization process to protect the reduced Cr(III) in the chromium slag from secondary oxidation. The chromium slag finally flows out from the discharge port, and is discharged after being cooled by water to below 200°C;

[0027] 2. Biomass enters the fluidized bed pyrolysis furnace from the lower side of the chromium slag feed port, melts and pyrolyzes rapidly and distributes on the surface of chromium slag particles, releasing a large amount of pyrolysis gas at the same time. Control the mass ratio of biomass to chromium slag: biomass: chromium slag=0.7:1;

[0028] 3. In the reduction combustion furnace, the...

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Abstract

The invention relates to a fluidized bed type of harmless chromium slag pyrolysis process. The process is characterized in that biomass and chromium slag into are respectively added into a high temperature fluidized bed pyrolysis furnace, wherein the biomass rapid melts and pyrolyses to release a lot of pyrolysis gas in the process, so as to reduce Cr (VI); at the same time pyrolysis carbon residue attaches to fluidization process the chromium slag surface to protect the reduced Cr (III) reduction in chromium residue from secondary oxidation, and the chromium slag conducts effectively catalytic cracking on be produced pyrolysis gas to avoid generation of a lot of high-pollution tar gas. Compared with the traditional pyrolysis technology, the technology greatly shortens the residence time, at the same time produces energy tail gas with high heat value, and avoids the disposal of the exhaust.

Description

technical field [0001] The invention is a fluidized bed type chromium slag pyrolysis harmless process. Through process control, the Cr(VI) in the chromium slag can be efficiently reduced, and the reaction time can be greatly shortened. At the same time, the tail gas can be used as energy, saving energy. While saving energy, it avoids exhaust gas treatment. The invention belongs to the technical field of environmental protection. Background technique [0002] Chromium slag is a by-product emitted during the production of dichromate. Because it contains water-soluble Cr(VI), it is extremely toxic. If it is stacked in the open air without treatment, it will cause varying degrees of pollution to groundwater sources, rivers or sea areas, and seriously endanger human health and the growth of animals and plants. [0003] Generally speaking, the current detoxification methods for chromium slag (i.e. changing highly toxic Cr(VI) to Cr(III)) are divided into two categories: wet deto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 张大磊芦静路亮
Owner 光大理工环境技术研究院(青岛)有限公司
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