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Chromium slag processing method

A treatment method, chromium slag technology, applied in the direction of improving process efficiency, etc., can solve the problems of complex process, secondary pollution, high treatment cost, etc., and achieve the effect of no secondary pollution, high strength, and effective resource saving

Active Publication Date: 2015-11-11
河南景耀热电环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing technology mostly adopts the wet method to reduce and detoxify the chromium slag. After the chromium slag is finely ground and alkaline hydrolyzed, the Cr 6+ It is reduced to Cr under the action of reducing agent 3+ , the process is complex, easy to cause secondary pollution, and the treatment cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for treating chromium slag, comprising the steps of:

[0023] (1) Ingredients: weigh the chromium slag and raw coal, and blend them with a weight ratio of 1:9, then crush the mixture to make the fineness R 90 15%;

[0024] (2) Incineration and detoxification: spray the mixed material obtained in step (1) into the cyclone furnace with hot air for high-temperature incineration. The incineration temperature is 1600°C and the time is 2s; the temperature of the hot air is 160°C and the flow rate is 86888m 3 / h, the flow rate is 30-35m / s; the air volume ratio in the cyclone furnace is: primary air rate 16.9%, primary air temperature 237°C, primary air velocity 26.7m / s, primary air volume 86888m 3 / h; secondary air rate 62.3%, secondary air temperature 353°C, secondary air velocity 69.4m / s, secondary air volume 395277m 3 / h; the rate of the third wind is 20.8%, the temperature of the third wind is 60°C, the speed of the third wind is 55m / s, and the volume of the thi...

Embodiment 2

[0031] A method for treating chromium slag, comprising the steps of:

[0032] (1) Ingredients: weigh the chromium slag and raw coal, and blend them so that the chromium slag accounts for 4% of the total weight of the mixture, and then crush the mixture to make the fineness R 90 12%;

[0033] (2) Incineration and detoxification: spray the mixed material obtained in step (1) into a cyclone furnace with hot air for high-temperature incineration. The incineration temperature is 1400°C and the time is 5s; the temperature of the hot air is 150°C and the flow rate is 86888m 3 / h, the flow rate is 30-35m / s; the air volume ratio in the cyclone furnace is: primary air rate 16.9%, primary air temperature 237°C, primary air velocity 26.7m / s, primary air volume 86888m 3 / h; secondary air rate 62.3%, secondary air temperature 353°C, secondary air velocity 69.4m / s, secondary air volume 395277m 3 / h; the rate of the third wind is 20.8%, the temperature of the third wind is 60°C, the speed o...

Embodiment 3

[0040] A method for treating chromium slag, comprising the steps of:

[0041] (1) Ingredients: weigh the chromium slag and raw coal, and blend them so that the chromium slag accounts for 12% of the total weight of the mixture, and then crush the mixture to make the fineness R 90 20%;

[0042] (2) Incineration and detoxification: spray the mixed material obtained in step (1) into a cyclone furnace with hot air for high-temperature incineration. The incineration temperature is 1500°C and the time is 4s; the temperature of the hot air is 170°C and the flow rate is 86888m 3 / h, the flow rate is 30-35m / s; the air volume ratio in the cyclone furnace is: primary air rate 16.9%, primary air temperature 237°C, primary air velocity 26.7m / s, primary air volume 86888m 3 / h; secondary air rate 62.3%, secondary air temperature 353°C, secondary air velocity 69.4m / s, secondary air volume 395277m 3 / h; the rate of the third wind is 20.8%, the temperature of the third wind is 60°C, the speed ...

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PUM

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Abstract

The invention relates to a chromium slag processing method which includes the steps of weighing and blending of ash of a refuse incineration power plant, medical incineration ash and raw coal, incineration and detoxification, fly ash remelting, smoke exhausting, water quenching and sealing, and the like. Poisonous chromium slag is detoxified by reduction at high temperature through a cyclone furnace. By making the best of the characteristic that a reducing area formed in operation with high heat strength, sufficient reducing power and a small air coefficient of excess air of the cyclone furnace reduces hexavalent chromium into trivalent chromium, the process of chromium slag processing is finished on the premise of guaranteeing the heat generation capacity. The chromium slag processing method is thorough in detoxification and free of secondary pollution, the chromium slag is recycled, and both positive benefits and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a method for treating chromium slag. Background technique [0002] Chromium slag is an industrial waste slag produced during the production of metallic chromium and chromium salts. Its chemical composition is: silicon dioxide accounts for 4-30%, aluminum oxide accounts for 5-10%, calcium oxide accounts for 26-44%, magnesium oxide Accounted for 8 to 36%, ferric oxide accounted for 2 to 11%, chromium hexoxide (Cr 2 o 6 ) accounted for 0.6 to 0.8% and sodium dichromate (Na 2 Cr 2 o 7 ) accounted for about 1%. Due to the existence of hexavalent chromium, chromium slag is harmful to human beings, and more than 20 provinces and cities in China currently discharge chromium slag, which brings great pressure to the environment. [0003] At present, the existing technology mostly adopts the wet method to reduce and detoxify the chromium slag. After the chrom...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/32
CPCY02P10/20
Inventor 王慧智
Owner 河南景耀热电环保科技有限公司
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