Technology of sintering chromium residue detoxified in vertical kiln at high temperature for ironmaking

A technology of chromium slag and high temperature, which is applied in the field of chromium slag treatment and comprehensive utilization, can solve the problems of increasing chromium slag hexavalent chromium ironmaking plant surrounding environmental pollution possibility and risk, and achieves obvious environmental benefits

Inactive Publication Date: 2011-10-05
TIANJIN ORIENT ENVIRONMENTAL PROTECTION ENERGY SAVING ENG TECH
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Problems solved by technology

[0002] At present, the chromium slag is directly transported to the iron-making plant for sintering, which is used for iron-making, replacing the high-temperature detoxification method of dolomite, and increasing the pollution possibility and risk of hexavalent chromium in the transportation of chromium slag and the surrounding environment of the iron-making plant.

Method used

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  • Technology of sintering chromium residue detoxified in vertical kiln at high temperature for ironmaking
  • Technology of sintering chromium residue detoxified in vertical kiln at high temperature for ironmaking

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Embodiment Construction

[0007] According to the schematic diagram of the project in Figure 1, put the chromium slag in the dryer to dry, and then enter it separately with coal and clay through the batching scale. Then enter the raw material powder and grind it into raw material powder, then go through the elevator, pre-add water, form a ball, and then enter the shaft kiln for firing. ℃ above 2, the sintered material for ironmaking is fired in the carbon monoxide atmosphere, and the sintered material discharged from the shaft kiln is rapidly cooled with water to meet the regulations on hexavalent chromium in GB5085.3-1996 "National Hazardous Waste Identification Standards" Index ≤ 1.5mg / L becomes sintering material for ironmaking.

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Abstract

The invention belongs to the technology of treatment and comprehensive utilization of chromium residues. Since the content of CaO and MgO in chromium residues is the same as that in dolomite, sintered chromium residues can be used to fully or partially substitute dolomite as the sintering material for ironmaking. According to the invention, when the reducing atmosphere generated by sintering the chromium residues with deep and hidden fire in the vertical kiln at a temperature of 900 DEG C passes through a preheating zone with a temperature of more than 900 DEG C, hexavalent chromium in the chromium residues is reduced to trivalent chromium which is melted in a molten mass; the trivalent chromium in the sintered chromium residues is oxidized by quenching with water in a cooling zone at a temperature of between 750 and 850 DEG C; therefore, the chromium residues are detoxified and are prepared into a sintering material used in ironmaking enterprises. The invention is a comprehensive utilization technology for chromium residues, which is safe, produces no secondary pollution, and has significant economic benefits, social benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the treatment and comprehensive utilization technology of chromium slag. In particular, it relates to reducing the hexavalent chromium in the chromium slag to trivalent chromium during the sintering process at high temperature in a vertical kiln, so that the chromium slag forms a sintered material to achieve harmless treatment and become a sintered material for ironmaking. The content of CaO and MgO in chromium slag is consistent with the sum of the two contents in dolomite. Realize that the chromium slag sintering material replaces or partly replaces dolomite as the sintering material for ironmaking. Background technique [0002] At present, the chromium slag is directly transported to the ironworks for sintering and used in ironmaking to replace the dolomite high-temperature detoxification method, which increases the possibility and risk of pollution of chromium slag during transportation and the surrounding environment of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D101/43C22B1/214C01G37/02A62D3/37
Inventor 刘志刚谢学农郑暘
Owner TIANJIN ORIENT ENVIRONMENTAL PROTECTION ENERGY SAVING ENG TECH
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