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Method for producing iron-based water purifier by using pickling waste acid

A technology for pickling waste acid and water purifying agent, applied in the chemical industry, can solve problems such as resource consumption and increase cost, and achieve the effects of reducing dosage, harmless treatment and rational comprehensive utilization of resources

Inactive Publication Date: 2016-06-22
QINGDAO SANYOU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The above method either adds iron filings, or uses steam, or uses chlorate as an oxidant, which not only consumes resources, but also increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In a tower reactor with a length-to-diameter ratio of 40, the adjusted ferrous chloride content of 20%, free acid content of 6% pickling waste acid at a speed of 1500kg / h, 20% sodium nitrate and sodium nitrite weight The mixed solution with a ratio of 1:1 is continuously added at a rate of 2kg / h, and air or oxygen is introduced at the bottom of the tower to carry out the oxidation reaction. By controlling the circulation amount of the circulating liquid, the content of the liquid ferrous chloride discharged from the bottom of the tower is controlled to be ≤0.2 %, add ferrous chloride crystals or 30% hydrochloric acid in the circulating tank, adjust the content of ferrous chloride and hydrochloric acid in the circulating liquid, and make the top of the tower enter the liquid FeCl 2 The weight ratio of HCl / HCl is 3.5, part of the liquid discharged from the bottom of the tower enters the circulation tank, and part enters the intermediate storage tank. The liquid in the inte...

Embodiment 2

[0052] In a tower reactor with a length-to-diameter ratio of 20, the pickling waste acid with a ferrous chloride content of 24% and a free acid content of 7% is used at a speed of 400kg / h, and 20% sodium nitrite solution is used at a rate of 1kg / h. The speed is continuously added, and air or oxygen is introduced at the bottom of the tower to carry out the oxidation reaction. By controlling the circulation volume of the circulating liquid, the content of the liquid ferrous chloride discharged from the bottom of the tower is controlled to be ≤0.2%, and ferrous chloride crystallization is added to the circulating tank Or 30% hydrochloric acid, adjust the content of ferrous chloride and hydrochloric acid in the circulating liquid, so that the liquid FeCl enters the top of the tower 2 The weight ratio of HCl / HCl is 3.5, and part of the liquid discharged from the bottom of the tower enters the circulation tank, and part of it enters the intermediate storage tank. ≤0.2%, free acid ≤0...

Embodiment 3

[0054] In a tower reactor with an aspect ratio of 36, pickling waste acid with a ferrous chloride content of 20% and a free acid content of 6% is used at a speed of 2000kg / h, and the weight ratio of 20% sodium nitrate to sodium nitrite is 1 : The mixed solution of 1 is added continuously with the speed of 2kg / h, and air or oxygen are passed into at the bottom of the tower, carry out oxidation reaction, by controlling the circulation rate of circulating liquid, control the liquid ferrous chloride content≤0.2% of discharging at the bottom of the tower, Add ferrous chloride crystals or 30% hydrochloric acid into the circulation tank to adjust the content of ferrous chloride and hydrochloric acid in the circulating liquid, so that the liquid FeCl enters the top of the tower 2 The weight ratio of / HCl is 3.7, and the total iron content is 10-12%. The liquid discharged from the bottom of the tower enters the circulation tank partly, and partly enters the intermediate storage tank. Th...

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PUM

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Abstract

The invention discloses a method for producing an iron-based water purifying agent by using pickling waste acid. Introduce air or oxygen for oxidation, and part of the liquid discharged from the bottom of the tower circulates; adjust the circulation rate, control the content of ferrous chloride in the liquid ferrous chloride discharged from the bottom of the tower to ≤0.2%, and adjust the ferrous chloride in the pickling waste acid solution according to the requirements of the product. The ratio of iron to hydrochloric acid, the liquid discharged from the bottom of the tower can be concentrated to obtain the water purifying agent liquid ferric chloride or polyferric chloride that meets the national standard. The product solution prepared by this method can be used as a flocculant for the treatment of urban sewage and industrial wastewater. At the same time, the above method can treat the hazardous waste such as pickling waste acid with low consumption, cleanliness and harmlessness, and reduce the amount of catalyst .

Description

technical field [0001] The invention relates to a method for producing an iron-based water purifying agent by using pickling waste acid, which is a clean treatment method for hazardous waste and belongs to the technical field of chemical industry. Background technique [0002] At present, in the production process of the metal products industry, it is necessary to remove the iron scale on the surface of the steel for pickling. During the pickling process, a large amount of waste acid solution will be produced. The main components of the pickling waste solution are: free acid, ferrous chloride and water. . Its content varies with the pickling process, operating temperature, steel material, and specifications. Generally, it contains ferrous chloride: 16-32%, and free acid: 5-8%. According to market research, my country's steel output reached 630 million tons in 2010, and 100 million tons of steel products that need to be pickled are increasing at a rate of 10% per year. Gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/10
Inventor 隋建春毕宇悦心朱建丰田书龙周颖许向勇张秀琴郭凯华邹国顺
Owner QINGDAO SANYOU TECH