Method for resource treatment of phosphatized sludge

A technology of phosphating sludge and disposal method, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of difficult treatment of phosphating wastewater and high treatment cost, and achieve low treatment cost , high processing efficiency, and the effect of resource utilization

Inactive Publication Date: 2017-05-31
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the characteristics of the existing phosphating wastewater that is difficult to handle and has relatively high treatment costs, the present invention provides a new device and method for co-processing ammonia nitrogen wastewater with phosphating wastewater

Method used

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  • Method for resource treatment of phosphatized sludge

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Effect test

Embodiment 1

[0042] Adopt the present invention to process the phosphating sludge that certain surface treatment enterprise of Jiangsu produces, and its operation condition is: adopt the waste sulfuric acid that acid concentration is 10%, the dosing ratio of phosphating sludge and waste sulfuric acid (each embodiment is) is: 1:5, stirring and mixing time is 1h. After the reaction, filter the filter residue and send it to the cement plant to make cement; the filtrate is added with a self-precipitating agent, and the ratio of the precipitating agent is NaOH:EDTA:FeSO 4 =2:3:0.5, the dosage of precipitant is 0.3% of the filtrate, and the reaction time is 1h; after passing through the anion exchange resin, the adsorbed saturated resin is eluted at a rate of 1.4 volume columns / hour, and in the eluent Add 10% slaked lime, react for 1.5h, and the reaction pH is 6 to form phosphate pigment.

Embodiment 2

[0044] Using the present invention to treat phosphating sludge from a chemical enterprise in Anhui, the operating conditions are as follows: waste sulfuric acid with an acid concentration of 5% is used, the dosing ratio of phosphating sludge to waste sulfuric acid is 1:15, and the mixing time is 2 hours , after the reaction, the filter residue is press-filtered and sent to the cement plant to make cement; the filtrate is added with a precipitant prepared by itself, and the precipitant configuration ratio is NaOH:EDTA:FeSO 4=6:1:1, the dosage of the precipitant is 1.2% of the filtrate, and the reaction time is 1.5h; after passing through the anion exchange resin, the adsorbed saturated resin is eluted at a rate of 1.8 volume columns / hour, and in the eluent Add 15% slaked lime internally, react for 2 hours, and the reaction pH is 7 to form phosphate pigment.

Embodiment 3

[0046] Using the present invention to treat phosphating sludge from a stainless steel production enterprise in Anhui, the operating conditions are as follows: waste sulfuric acid with an acid concentration of 20% is used, the ratio of phosphating sludge to waste sulfuric acid is 1:3, and the stirring and mixing time is 1.5h, after the reaction, filter the filter residue and send it to the cement plant to make cement; the filtrate is added with a self-precipitating agent, and the ratio of the precipitating agent is NaOH:EDTA:FeSO 4 =3:2:0.8, the dosage of the precipitant is 1.5% of the filtrate, and the reaction time is 0.5h; after passing through the anion exchange resin, the adsorbed saturated resin is eluted at a rate of 1.2 volume columns / hour, and in the eluent Add 20% slaked lime internally, react for 2.5 hours, and the reaction pH is 8 to form phosphate pigment.

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Abstract

The invention discloses a method for resource treatment of phosphatized sludge, and belongs to the field of solid waste resource utilization. The method is characterized in that for the problem of limitation to the resource utilization of the phosphatized sludge by the heavy metal impurities in the phosphatized sludge, the acid extraction and physical-chemical treatment type is adopted, so as to realize the resource utilization of the phosphatized sludge. The method has the advantages that by using waste phosphate to perform acid extraction, while the phosphatized sludge is utilized in a resource way, the waste acid is also treated, so as to greatly reduce the operation and treatment cost of the technology, realize the new concept of using wastes to treat wastes, and effectively combine the waste treatment and the resource utilization; the economic benefit and environment benefit are good, and the method is suitable for being popularized and used.

Description

technical field [0001] The invention belongs to the field of environmental protection and resource regeneration, and in particular relates to a method for resourceful disposal of phosphating sludge. Background technique [0002] With the rapid development of automobile manufacturing, electronic processing, electroplating and other industries, metal surface phosphating treatment technology has been widely used. Phosphating treatment is the process of forming an insoluble phosphate film on the metal surface by using a solution containing phosphoric acid or phosphate, which is a commonly used process technology for metal surface treatment. The general phosphating process includes alkali cleaning to remove oil, pickling and rust removal, phosphating and passivation treatment, during which a large number of pollutants are produced, such as emulsified oil, surfactants and phosphate, etc. The amount is relatively large, exceeding the standard seriously, and due to the wide variety...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12C02F11/14C02F1/42C02F9/04C01B25/26C02F101/20C02F101/22
Inventor 张后虎叶飞赵泽华焦少俊张俊王玉婷许元顺王俊杰刘茹张静
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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