Method for recycling waste acid residue resources generated in stainless steel industry

A stainless steel and industry technology, applied in the field of waste acid slag resource recycling generated by the stainless steel industry, can solve the problems of large processing capacity, low processing cost, and reducing the difficulty and cost of waste gas treatment

Active Publication Date: 2021-08-20
ZHEJIANG TELI RECYCLING RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the method of the present invention, the waste acid slag produced in the stainless steel industry is pretreated by water washing and deacidification, and aeration, stirring and rinsing is carried out through the specially designed aeration, stirring and rinsing device, so as to remove a large amount of metal ions and acidic components remaining in the acid slag in advance , nitrate, fluoride ions, etc., so that most of the pollutants that originally entered the smelting waste gas enter the rinsing and deacidification wastewater, while the pollutant treatment process in the deacidification wastewater is mature and stable, and the treatment capacity is large, the treatment cost is low, and the waste residue after deacidification It can directly enter the smelting process, effectively prevent pollutants from entering the exhaust gas, reduce the difficulty and cost of exhaust gas treatment, and effectively solve the limitation problem of pyro-smelting. At the same time, the products obtained from smelting can be directly reused in stainless steel production enterprises, effectively achieving resource recycling. use

Method used

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  • Method for recycling waste acid residue resources generated in stainless steel industry
  • Method for recycling waste acid residue resources generated in stainless steel industry
  • Method for recycling waste acid residue resources generated in stainless steel industry

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A resource for the stainless steel industry waste acid produced slag recycling method, comprising the steps of:

[0036] S1, the stainless steel washing waste, that is, the waste acid residue generated by the stainless steel industry, and feed into aerated stirring rinsing apparatus, and water is added;

[0037] S2, after the rinsing ends, solid-liquid separation is performed by filtration, to obtain a solid deacidized wastewater and liquid pickling wastewater;

[0038]S3, the deacidized wastewater is used to remove hydrogen, fluoride ions, and heavy metal ions, into the biochemical treatment system, remove the nitrate and COD; then discharged.

[0039] Preferably, in step S1, the water content produced by the stainless steel industry is between 13.68 to 61.31 wt%, between 0.37 to 4.29 wt%, between 2.37 ~ 37.59 wt%, CL. - Between 0.02 ~ 5.76 wt%, Fe is between 14.78 ~ 38.64 wt%, no 3 - Between 0.39 ~ 23.55 wt%.

[0040] Preferably, in step S1, the amount of water added and...

Embodiment 2

[0050] A method of recycling residue resource recycling in a stainless steel industry, including the following steps:

[0051] S1, the stainless steel washing waste, that is, the waste acid residue generated by the stainless steel industry, and feed into aerated stirring rinsing apparatus, and water is added;

[0052] S2, after the rinsing ends, solid-liquid separation is performed by filtration, to obtain a solid deacidized wastewater and liquid pickling wastewater;

[0053] S3, the deacidized wastewater is used to remove hydrogen, fluoride ions, and heavy metal ions, into the biochemical treatment system, remove the nitrate and COD; then discharged.

[0054] In the present embodiment, in step S1, the water content of the waste acid residue produced by the stainless steel industry is between 13.68 to 61.31% by weight, and Ni is between 0.37 to 4.29 wt%, and Cr is between 2.37 and 37.59 wt%. , CL - Between 0.02 ~ 5.76 wt%, Fe is between 14.78 ~ 38.64 wt%, no 3 - Between 0.39 ~ 23...

Embodiment 3

[0062] Based on Example 2, the aeration tube one 22, the aeration tube 23, and the aeration tube three 24 are provided with a vertical via hole 261 and a lateral through hole 262. like Figure 2 As shown, the increasing gas mixing effect is further strengthened by the vertical through hole 261 and the lateral via 262 in the plurality of directions.

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Abstract

The invention discloses a method for recycling waste acid residue resources generated in the stainless steel industry. The method comprises the following steps of S1, feeding stainless steel pickling wastes, namely waste acid residues generated in the stainless steel industry, into an aeration stirring rinsing device, and adding water for rinsing; S2, after rinsing is finished, carrying out solid-liquid separation in a filtering mode to obtain solid deacidified waste residues and liquid pickling waste water; S3, removing hydrogen ions, fluorine ions and heavy metal ions from the deacidified wastewater by adopting a chemical precipitation method, and then feeding the deacidified wastewater into a biochemical treatment system to remove nitrate radicals and COD; and discharging after reaching the standard. According to the method, the waste acid residues generated in the stainless steel industry are subjected to washing deacidification, aeration stirring rinsing is carried out through the specially-designed aeration stirring rinsing device, and a large number of residual metal ions, acid components, nitrate radicals, fluorine ions and the like in the acid residues are removed in advance; and then the deacidified wastewater and the deacidified waste residues are separately treated, cooperative treatment is carried out through a plurality of treatment measures, and discharging is carried out after reaching the standard.

Description

Technical field [0001] The present invention relates to the technical field of industrial waste treatment, in particular, to a resource for recycling of the stainless steel industry waste acid produced slag method. Background technique [0002] Stainless steel is a metal alloy composed of iron, chromium, nickel, carbon, silicon, and internal elements may also be present in addition to the above a number of trace elements, such as titanium, molybdenum, tungsten and the like. In steel making, hot rolling, heat treatment process, easy to form a surface layer of black iron oxide. Many stainless steel due to alloying elements added, the iron oxide composition is very complex, in addition to FeO, Fe 2 O 3 , Fe 3 O 4 Outside, as well as Cr 2 O 3 , NiO and combinations of these ingredients, such as spinel type FeOCr 2 O 3 (FeCr 2 ) Or Fe 2 O 3 CR 2 O 3 Etc., the thickness of the oxide scale and the number of layers than plain carbon steel. In order to obtain an ideal surface finish stain...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00B08B3/10
CPCB09B3/00B09B5/00B08B3/10B09B2101/02Y02P10/20
Inventor 易秉智陈剑峰彭金鑫
Owner ZHEJIANG TELI RECYCLING RESOURCES
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