Chromium slag pyrolysis treatment method with high efficiency, low consumption, and low pollution

A treatment method and low-polluting technology, applied in the direction of solid waste removal, etc., can solve the problems of great harm, waste of energy, reduction of reduction efficiency, etc., and achieve the effects of reducing the discharge of harmful substances, saving energy, and simplifying control.

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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Problems solved by technology

However, this process has many defects. On the one hand, because the process mixes organic matter and chromium slag in the low-temperature area, during the movement of the two to the high-temperature area, the organic matter in the sludge will continuously produce tar gas and enter the tail gas along the airflow, while the tar gas Contains a large amount of carcinogens such as polycyclic aromatic hydrocarbons, and is easily discharged in the form of PM2.5 during the cooling process, which is extremely harmful,

Method used

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  • Chromium slag pyrolysis treatment method with high efficiency, low consumption, and low pollution

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example 2

[0028] 1. After the chromium slag is ground to <2mm, it is sent to the tail of the first-stage internal heating rotary kiln, and then the first-stage internal heating rotary kiln is turned to make the chromium slag gradually drive from the kiln tail to the kiln head;

[0029] 2. The chromium slag is mixed with high-temperature exhaust gas at the head of the first-stage rotary kiln to be heated, and the temperature of the head of the first-stage rotary kiln is controlled at 600°C. The heated chromium slag enters the tail of the second-stage internal heating rotary kiln from the kiln head through a chain conveyor belt, and a silo is set at the upper part of the second-stage rotary kiln to add straw to mix the straw with the high-temperature chromium slag at a mixing ratio of straw : High temperature chromium slag=1:10. The mixed straw and chromium slag arrive at the kiln head of the secondary rotary kiln after 10 minutes of operation in the secondary rotary kiln, and are dischar...

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Abstract

The invention discloses a chromium slag pyrolysis treatment method capable of realizing high efficiency chromium slag treatment, and reducing emission amount of harmful substances such as tar at the same time. According to the chromium slag pyrolysis treatment method, chromium slag and straw are mixed and reacted at a high-temperature area; obtained high-temperature tar gas flows to a low-temperature area, a part of the high-temperature tar gas is cooled onto the surface of the chromium slag which is delivered to the high-temperature area, and is reacted with Cr (VI) on chromium slag surface, and the other part of the high-temperature tar gas is removed via reaction with oxygen at the low-temperature area; at the same time, because of full utilization of the tar gas, effective reduction of Cr (VI) in the chromium slag is realized, and oxidation of chromium is controlled effectively; and in addition, another by-product of the chromium slag pyrolysis treatment method, high temperature tail gas is taken as a heat source to heat the chromium slag, so that energy consumption is reduced greatly.

Description

technical field [0001] The invention is a high-efficiency, low-consumption and low-pollution pyrolysis treatment method for chromium slag. Through process control, Cr(VI) in chromium slag can be efficiently reduced, and at the same time, the emission of tar gas and other harmful substances in tail gas can be greatly reduced, and at the same time, the Energy saving. 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:...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 张大磊王亚空孙英杰芦静
Owner 光大理工环境技术研究院(青岛)有限公司
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