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Circular processing method of stainless steel acid washing waste liquid

A technology for pickling waste liquid and recycling treatment, applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. The effect of reducing costs

Inactive Publication Date: 2015-04-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this treatment method can reduce the amount of sludge to about 1 / 3 of the original amount, there are also obvious shortcomings: (1) the cost of adding NaOH lye is relatively high; (2) not all the polluting ions Carry out comprehensive pollution-free disposal; (3) The cost of tail liquid treatment is relatively high
But there are also some disadvantages: (1) a large amount of concentrated H needs to be added in the process of preparing ferrite 2 SO 4 , NaOH and other agents, the environmental burden is heavy, and the cost is relatively high; (2) the preparation of ferrite by this method is complicated and economical, and it is not easy to be used in large-scale industrial production
[0010] To sum up, the common disadvantage of the existing technology is that the treatment of stainless steel waste liquid is not a complete system, and the recycling value of various metal ions is not considered comprehensively, the disposal cost is high, and the secondary discharge is large

Method used

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  • Circular processing method of stainless steel acid washing waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using lye as NaOH and Na 2 CO 3 Add the mixed solution of stainless steel pickling waste liquid to neutralize and precipitate, wherein the gram equivalent of NaOH is Cr 3+ 、Ni 2+ , Fe 2+ and Fe 3+ 1.1 times of the sum of the gram equivalents, and the pH value is adjusted to be 7. metal ion and OH - After precipitation, it was filtered and dried to obtain Cr(OH) 3 , Ni(OH) 2 , Fe(OH) x Metallurgical raw materials that can be recycled and reused. To the filtrate 1, add gram equivalents of F - , CO 3 2- and SO 4 2- Lime with 1.1 times the sum of gram equivalents has a pH value of 8. F in filtrate 1 - , CO 3 2- and SO 4 2- with Ca 2+ CaF was obtained by precipitation filtration 2 , CaCO 3 and CaSO 4 . Add gram equivalents to the filtrate 2 again and be Ca(OH) 2 Na with 1.1 times the gram equivalent 2 CO 3 , the Ca(OH) 2 converted to CaCO 3 Precipitated, filtered to obtain CaCO 3 and containing NaOH, Na 2 CO 3 Filtrate 3. The filtrate 3 is di...

Embodiment 2

[0024] Using lye as NaOH and Na 2 CO 3 Add the mixed solution of stainless steel pickling waste liquid to neutralize and precipitate, wherein the gram equivalent of NaOH is Cr 3+ 、Ni 2+ , Fe 2+ and Fe 3+ 1.5 times of the sum of the gram equivalents, and the pH value is adjusted to 9.5. metal ion and OH - After precipitation, it was filtered and dried to obtain Cr(OH) 3 , Ni(OH) 2 , Fe(OH) x Metallurgical raw materials that can be recycled and reused. To the filtrate 1, add gram equivalents of F - , CO 3 2- and SO 4 2- Lime with 1.5 times the sum of gram equivalents has a pH value of 10. F in filtrate 1 - , CO 3 2- and SO 4 2- with Ca 2+ CaF was obtained by precipitation filtration 2 , CaCO 3 and CaSO 4 . Add gram equivalents to the filtrate 2 again and be Ca(OH) 2 Na with 1.5 times the gram equivalent 2 CO 3 , the Ca(OH) 2 converted to CaCO 3 Precipitated, filtered to obtain CaCO 3 and containing NaOH, Na 2 CO 3 Filtrate 3. The filtrate 3 is di...

Embodiment 3

[0026] Using lye as NaOH and Na 2 CO 3 Add the mixed solution of stainless steel pickling waste liquid to neutralize and precipitate, wherein the gram equivalent of NaOH is Cr 3+ 、Ni 2+ , Fe 2+ and Fe 3+ 1.3 times of the sum of the gram equivalents, and the pH value is adjusted to be 8.5. metal ion and OH - After precipitation, it was filtered and dried to obtain Cr(OH) 3 , Ni(OH) 2 , Fe(OH) x Metallurgical raw materials that can be recycled and reused. To the filtrate 1, add gram equivalents of F - , CO 3 2- and SO 4 2- Lime with 1.3 times the sum of gram equivalents has a pH value of 9. F in filtrate 1 - , CO 3 2- and SO 4 2- with Ca 2+ CaF was obtained by precipitation filtration 2 , CaCO 3 and CaSO 4 . Add gram equivalents to the filtrate 2 again and be Ca(OH) 2 Na with 1.3 times the gram equivalent 2 CO 3 , the Ca(OH) 2 converted to CaCO 3 Precipitated, filtered to obtain CaCO 3 and containing NaOH, Na 2 CO 3 Filtrate 3. The filtrate 3 is ...

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Abstract

The invention belongs to the technical field of waste processing and circular economy, in particular to a circular processing method of stainless steel acid washing waste liquid. The circular processing method comprises the steps of: in allusion to various acid radical ions and metal ions (SO4<2->, F<->, Cr<3+>, Ni<2+>, Fe<2+>, Fe<3+>) in the stainless steel acid washing waste liquid, firstly regulating the pH value of the acid washing waste liquid to 7-10 by using alkaline liquid, and precipitating and drying the metal ions Cr<3+>, Ni<2+>, Fe<2+> and Fe<3+> to form a metallurgical raw material; then adding lime to a filtrate to precipitate F<->, CO3<2-> and SO4<2-> in the forms of CaF2, CaCO3 and CaSO4; and finally adding Na2CO3 to the filtrate to obtain CACO3 precipitation, wherein the filtrate is the mixed solution of NaOH and Na2CO3 and directly returns the filtrate to the stainless steel acid washing waste liquid to precipitate the metal ions. The circular processing method realizes ultralow emission of the stainless steel acid washing waste liquid, danger-free solid waste emission, harmless reutilization of heavy metal ions and recycling of tail liquid, and has obvious economic, environmental and social benefits.

Description

[0001] The invention provides a recycling treatment method for the reduction and harmlessness of stainless steel pickling waste liquid, which belongs to the field of metallurgy and environmental protection, and particularly relates to the harmless recycling of heavy metal ions in stainless steel pickling liquid and the recycling of tail liquid method of use. Background technique [0002] Stainless steel has the characteristics of high strength, corrosion resistance and good plasticity, and is widely used in transportation, decoration, catering and other industries. Stainless steel production is an industry with serious pollution, such as air pollution, dust pollution, and pickling waste liquid pollution caused by production, which restricts its development to a certain extent. Before cold rolling, stainless steel is subjected to pickling surface treatment such as sulfuric acid, hydrofluoric acid, etc., resulting in a large amount of acidic waste liquid containing toxic and har...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/16
Inventor 张深根邝春福田建军潘德安陈根刘波
Owner UNIV OF SCI & TECH BEIJING
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