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Method for producing iron series water purification agent by using pickling waste acid

A technology of pickling waste acid and water purifier, which is applied in the chemical industry, can solve the problems of increasing costs and consuming resources, and achieve the effects of reducing consumption, harmless treatment and rational and comprehensive utilization of resources

Inactive Publication Date: 2012-06-20
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 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%, 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 adds 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. The li...

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Abstract

The invention discloses a method for producing an iron series water purification agent by using pickling waste acid. The method is characterized in that pickling acid pickle and a catalyst solution are continuously added in an oxidation column with the length-diameter ratio being 20 to 40, meanwhile, air or oxygen is continuously fed into the oxidation column for oxidation, and liquid discharged from the bottom of the oxidation column is partially circulated; the circulating mass is regulated, the content of iron dichloride in the liquid discharged from the bottom of the oxidation column is equal to or smaller than 0.2 percent, the proportion of iron dichloride and hydrochloric acid in pickling acid pickle is regulated according to the product requirement, and the liquid discharged from the bottom of the oxidation column is concentrated to obtain the water purification agent-ferric trichloride or polyferric chloride conforming to the national standard. The product solution prepared by the method can serve as a flocculating agent used for treatment of urban sewage and industrial sewage, meanwhile, the method can carry out low-consumption, clean and harmless treatment to pickling waste acid (hazardous waste), and reduces the use amount of catalysts.

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 Applications(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
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