Resource utilization method after iron content of steel pickling sludge after quickly increasing iron contentis quickly improved

A technology for steel pickling and iron content, which is applied in chemical instruments and methods, sludge treatment, and oxidation treatment of sludge, etc., can solve the problems of complicated operation and high cost of steel pickling sludge treatment, and achieves a simple and clean process. The effect of producing environmental protection circular economy, the effect of reducing the burden

Inactive Publication Date: 2017-09-26
天津丰源首创环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for resource utilization of iron and steel pickling sludge after rapidly increasin

Method used

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  • Resource utilization method after iron content of steel pickling sludge after quickly increasing iron contentis quickly improved

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 A resource utilization method after rapidly increasing the iron content of iron and steel pickling sludge is shown, comprising the following steps:

[0029] (1) Add the ferric hydroxide sludge and the ferrous salt solution produced after the pickling waste water and press filtration into the mixing tank, and mix and stir;

[0030] (2) Regulate the pH of the mixture in the stirring tank, and adjust the pH of the mixture to be 6;

[0031] (3) transfer the homogeneous mixture in the step (2) to the oxidation tank and feed air into the oxidation reaction;

[0032] (4) Transfer the oxidized mixture in step (3) to the heating pool for heating reaction to generate regenerated ferric oxide. The specific heating method is gas steam heating, and the heating temperature is 100 ° C. The color of the mixture to be observed is Stop heating when it is black;

[0033] (5) The waste gas produced in the step (4) is transported to the waste gas absorption tower for pro...

Embodiment 2

[0039] Such as figure 1 A resource utilization method after rapidly increasing the iron content of iron and steel pickling sludge is shown, comprising the following steps:

[0040] (1) Add the ferric hydroxide sludge and the ferrous salt solution produced after the pickling waste water and press filtration into the mixing tank, and mix and stir;

[0041] (2) Regulate the pH of the mixture in the stirring tank, and adjust the pH of the mixture to be 7;

[0042] (3) transfer the homogeneous mixture in the step (2) to the oxidation tank and feed air into the oxidation reaction;

[0043] (4) Transfer the oxidized mixture in step (3) to the heating pool for heating reaction to generate regenerated ferric oxide. The specific heating method is gas steam heating, and the heating temperature is 85 ° C. The color of the mixture to be observed is Stop heating when it is black;

[0044] (5) The waste gas produced in the step (4) is transported to the waste gas absorption tower for proc...

Embodiment 3

[0050] Such as figure 1 A resource utilization method after rapidly increasing the iron content of iron and steel pickling sludge is shown, comprising the following steps:

[0051] (1) Add the ferric hydroxide sludge and the ferrous salt solution produced after the pickling waste water and press filtration into the mixing tank, and mix and stir;

[0052] (2) Regulate the pH of the mixture in the stirring tank, and adjust the pH value of the mixture to be 8;

[0053] (3) transfer the homogeneous mixture in the step (2) to the oxidation tank and feed air into the oxidation reaction;

[0054] (4) Transfer the oxidized mixture in step (3) to the heating pool for heating reaction to generate regenerated ferric oxide. The specific heating method is gas steam heating, and the heating temperature is 75 ° C. The color of the mixture to be observed is Stop heating when it is black;

[0055] (5) The waste gas produced in the step (4) is transported to the waste gas absorption tower fo...

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Abstract

The invention provides a resource utilization method after an iron content of steel pickling sludge after quickly increasing iron contentis quickly improved. The resource utilization method comprises the following steps: adding ferric hydroxide sludge and a ferrite solution which are generated by neutralizing and filter pressing pickling wastewater into a stirring tank and stirring; adjusting power of hydrogen of a mixture in the stirring tank until a the pH value reaches 6 to 9; transferring the evenly-stirred mixture into an oxidation pond and performing oxidation reaction; after reaction finishes, transferring the mixture into a warming tank and introducing steam to worm warm to generate recycled ferroferric oxide; transferring a generated recycled ferroferric oxide mixed material into a cooling tank to be cooled; performing filter pressing after cooling to obtain a black recycled ferroferric oxide magnetic mineral powder mud material; conveying filtration water generated in a filter pressing process into the stirring tank to be circulated and recycled. The resource utilization method disclosed by the invention has the advantages of simple technology, convenience in operation, safety, reliability, high treating efficiency, no secondary environmental pollution and the like; in addition, pollution sources are changed into recycled resources after the iron content is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel solid hazardous waste treatment, and in particular relates to a method for resource utilization of iron and steel pickling sludge after rapidly increasing the iron content. Background technique [0002] During the pickling process of steel processing, a large amount of pickling wastewater will be generated. Because the acid wastewater is produced in a large amount and has a low concentration, in general, enterprises will adopt acid-base neutralization methods for treatment. [0003] The treatment method of acid-base neutralization will produce a large amount of sludge, and the particle size of the sludge is mostly in the range of 1-100 nanometers. However, the iron content of the sludge after pressure filtration is very low, which has no practical use value, and it is easy to form fine particles into the air due to surface dehydration and weathering during long-term stacking, forming haze a...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/18C02F101/20C02F103/16
CPCC02F11/00C02F11/06C02F11/18C02F2101/203C02F2103/16
Inventor 卢树坤
Owner 天津丰源首创环保科技有限公司
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