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Method for treating stainless steel pickling waste liquid

A technology of pickling waste liquid and treatment method, applied in energy waste water treatment, metallurgical waste water treatment, filtration treatment and other directions, can solve the problems of enterprise survival and hidden dangers, etc.

Inactive Publication Date: 2016-07-27
张石海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current status quo is that many enterprises have adopted stockpiling and other methods, which have laid great hidden dangers for the survival of enterprises, and at the same time put forward a severe test for environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Oxidation of ferrous ions: pass hot air into the concentrated solution of stainless steel pickling waste liquid, and oxidize most of the ferrous ions in the stainless steel pickling waste liquid into ferric ions;

[0028] (2) Precipitation of ferric ions by iron ore method: adjust the pH of the pickling waste liquid after the hot air oxidation section to about 4, and the precipitation of iron ore method will make the iron precipitate mainly consist of Fe 2 o 3 ·H 2 Formed in the form of O, if the shape of the iron slag generated at this time is not good, you can add Fe appropriately 2 o 3 ·H 2 O is used as a crystal seed to optimize the morphology of the generated iron slag, thereby facilitating the filtration of ferric ions precipitated by the iron ore method;

[0029] (3) Co-precipitation of trivalent chromium ions and nickel ions: filter the iron precipitate in step (2), add alkali to the filtrate to adjust the pH to 8.5 so that trivalent chromium ions and ni...

Embodiment 2

[0032] (1) Oxidation of ferrous ions: pass hot air into the concentrated solution of stainless steel pickling waste liquid, and oxidize most of the ferrous ions in the stainless steel pickling waste liquid into ferric ions;

[0033] (2) Precipitation of ferric ions by iron ore method: adjust the pH of the pickling waste liquid after the hot air oxidation section to about 4, and the precipitation of iron ore method will make the iron precipitate mainly consist of Fe 2 o 3 ·H 2 Formed in the form of O, if the shape of the iron slag generated at this time is not good, you can add Fe appropriately 2 o 3 ·H 2 O is used as a crystal seed to optimize the morphology of the generated iron slag, thereby facilitating the filtration of ferric ions precipitated by the iron ore method;

[0034] (3) Precipitation of trivalent chromium ions: filter the iron precipitate obtained in step (2), and add alkali to the filtrate to adjust the pH to 6 so that the Cr 3+ A precipitate of chromium h...

Embodiment 3

[0038] (1) Oxidation of ferrous ions: Pass hot air into the dilute solution of stainless steel pickling waste liquid, and oxidize most of the ferrous ions in the stainless steel pickling waste liquid into ferric ions;

[0039] (2) Precipitation of ferric ions: add alkali to adjust the pH so that ferric iron is dissolved in Fe(OH) 3 form, and at the same time makes the Cr in the stainless steel pickling waste 3+ does not form a precipitate;

[0040] (3) Co-precipitation of trivalent chromium ions and nickel ions: filter the iron precipitate obtained in step (2), and add alkali to the filtrate to adjust the pH so that trivalent chromium ions and nickel ions co-precipitate (this part Refer to Example 1) or adjust the pH so that trivalent chromium ions are precipitated first, filter the chromium precipitate and then adjust the pH to precipitate nickel ions (this part refers to Example 2);

[0041] (4) Comprehensive utilization of iron precipitates: drying and dehydrating the iro...

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PUM

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Abstract

The invention provides a method for treating stainless steel pickling waste liquid, comprising the following steps: (1), oxidizing ferrous ions: introducing an oxidant or hot air into stainless steel pickling waste liquid to oxidize most ferrous ions in the stainless steel pickling waste liquid into trivalent iron ions; (2) settling the trivalent iron ions by iron ore process: precipitating by iron ore process so that the trivalent iron ions obtained in step (1) generate iron precipitate mainly in the form of Fe2O3 H2O; (3), precipitating trivalent chromium ions and nickel ions: filtering the iron sediment obtained in step (2), adding a base to filtrate to adjust pH so that the trivalent chromium ions and the nickel ions co-precipitate, or to adjust pH so that the trivalent chromium ions precipitate first, filtering chromium precipitate, and adjusting pH to precipitate the nickel ions.The method provided herein enables iron resources and chromium-nickel resources to be recycled and solid hazardous waste to be avoided.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a treatment method for stainless steel pickling waste liquid. Background technique [0002] With the rapid development of the stainless steel industry, a large amount of mixed solid hazardous waste containing nickel, chromium and iron produced after the precipitation treatment of stainless steel pickling wastewater has become an extremely serious bottleneck for the development of the industry: 1. How to rationalize the large amount of hazardous waste disposal? 2. Is the enterprise able to afford the huge disposal fee required by entrusting a hazardous waste disposal enterprise? [0003] The current situation is that many enterprises have adopted stockpiling and other methods, which have laid great hidden dangers for the survival of enterprises, and also put forward a severe test for environmental protection. Contents of the invention [0004] The purpose of the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCY02W10/37C02F9/00C02F1/001C02F1/5236C02F1/66C02F1/74C02F2103/16
Inventor 张石海
Owner 张石海
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