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 treatmen

Method used

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  • Method for resource treatment of phosphatized sludge

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Example Embodiment

[0041] Example 1

[0042] Using the present invention to treat the phosphating sludge produced by a surface treatment enterprise in Jiangsu, the operating conditions are as follows: waste sulfuric acid with an acid concentration of 10% is used, and the dosage ratio of the phosphating sludge and the waste sulfuric acid (all in each embodiment) is: 1:5, the stirring and mixing time is 1h, after the reaction, the filter residue is pressure filtered and sent to the cement factory to make cement; the filtrate is added with a self-configured precipitant, and the proportion of the precipitant is NaOH:EDTA:FeSO 4 = 2:3:0.5, the dosage of the precipitant is 0.3% of the filtrate, and the reaction time is 1h; after passing through the anion exchange resin, the saturated resin is eluted with a rate of 1.4 volume column / hour, and in the eluent Add 10% slaked lime, react for 1.5h, and the reaction pH is 6 to form a phosphate pigment.

Example Embodiment

[0043] Example 2

[0044] Using the invention to treat the phosphating sludge of a chemical enterprise in Anhui, the operating conditions are as follows: waste sulfuric acid with an acid concentration of 5% is used, the dosage ratio of phosphating sludge and waste sulfuric acid is 1:15, and the stirring and mixing time is 2h After the reaction, the filter residue is pressure filtered and sent to the cement factory to make cement; the filtrate is added with a self-configured precipitant, and the proportion of the precipitant 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 saturated adsorption resin is eluted at a rate of 1.8 volumes of column / hour, and in the eluent. Add 15% slaked lime, react for 2 hours, and the reaction pH is 7 to form phosphate pigment.

Example Embodiment

[0045] Example 3

[0046] Using the invention to treat the phosphating sludge of 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 dosage ratio of the phosphating sludge and the waste sulfuric acid is 1:3, and the stirring and mixing time is 1.5h, after the reaction, the filter residue is pressure filtered and sent to the cement factory for making cement; the filtrate is added with a self-configured precipitant, and the proportion of the precipitant 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 saturated resin is eluted with a rate of 1.2 volume column / hour, and in the eluent Add 20% of slaked lime, react for 2.5 hours, and the reaction pH is 8 to form a 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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