A method for recycling and treating waste pickling liquid of stainless steel containing iron, chromium and nickel

A technology for recycling and treating pickling waste liquid, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of pickling waste liquid environmental pollution and achieve ecological protection Environment, the effect of creating economic benefits

Inactive Publication Date: 2016-10-05
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this situation, the present invention proposes a treatment method for stainless steel pickling waste liquid using simple chemical reaction equipment and low-cost chemical reagents, effectively separating valuable metal elements in the pickling waste liquid, and creating economic benefits for enterprises. benefits, and at the same time, the environmental pollution problem of pickling waste liquid will also be solved

Method used

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  • A method for recycling and treating waste pickling liquid of stainless steel containing iron, chromium and nickel

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Get stainless steel pickling waste liquid 100mL and pour in the 500mL beaker, measure the concentration of iron ion through flame atomic absorption spectrophotometry about 83mg / L, chromium (III) ion concentration is 23mg / L, and nickel ion concentration is 21mg / L.

[0032] First, add 10 mL of oxidant sodium hypochlorite solution to the pickling waste liquid and add 2 mol / L sodium hydroxide solution to adjust the pH value to 10.5. After the precipitation is complete, filter, and the chromium element is completely oxidized to hexavalent chromate (CrO4 2- ) exists in the filtrate 1, and the filter residue 1 is to be treated for the subsequent separation of iron and nickel. Use 2mol / L sulfuric acid solution to adjust the pH value of the filtrate 1 to 3.5, add the reducing agent sodium sulfite, let it stand for half an hour, then use sodium hydroxide solution to adjust the pH value back to alkaline 10.3, and filter after the precipitation is complete to obtain Cr (OH) 3 The ...

Embodiment 2

[0036] Get stainless steel pickling waste liquid 100mL and pour in the 500mL beaker, measure the concentration of iron ion through flame atomic absorption spectrophotometry to be about 98mg / L, chromium (III) ion concentration is 27mg / L, and nickel ion concentration is 27mg / L. Compared with embodiment 1, according to the pH adjustment range in the dosage example 2 of the sulfuric acid that adds and sodium hydroxide solution is different.

[0037] First, add 12mL of oxidant sodium hypochlorite solution to the pickling waste liquid and add 2 mol / L sodium hydroxide solution to adjust the pH value to 11.2. After the precipitation is complete, filter, and the chromium element is completely oxidized to hexavalent chromate (CrO4 2- ) exists in the filtrate 1, and the filter residue 1 is to be treated for the subsequent separation of iron and nickel. Use 2mol / L sulfuric acid solution to adjust the pH value of the filtrate 1 to 2.2, add the reducing agent sodium sulfite, let it stand fo...

Embodiment 3

[0041] Get stainless steel pickling waste liquid 100mL and pour in the 500mL beaker, measure the concentration of iron ion through flame atomic absorption spectrophotometry to be about 91mg / L, chromium (III) ion concentration is 23mg / L, and nickel ion concentration is 27mg / L. Compared with Examples 1 and 2, the method for separating iron and nickel is route 2-fractional precipitation.

[0042] First, add 12 mL of oxidant sodium hypochlorite solution to the pickling waste liquid and add 2 mol / L sodium hydroxide solution to adjust the pH value to 11.5. After the precipitation is complete, filter, and the chromium element is completely oxidized to hexavalent chromate (CrO4 2- ) exists in the filtrate 1, and the filter residue 1 is to be treated for the subsequent separation of iron and nickel. Use 2mol / L sulfuric acid solution to adjust the pH value of the filtrate 1 to 3.1, add the reducing agent sodium sulfite, let it stand for half an hour, then use sodium hydroxide solution t...

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Abstract

The invention discloses a method for recycling and treating waste pickling liquid of stainless steel containing iron, chromium and nickel. It includes the following steps: (1) first oxidizing chromium (III) ions under alkaline conditions and separating them from iron and nickel; (2) reducing chromium to trivalent under acidic conditions and then precipitating it as hydroxide; ( 3) Use ammonia leaching or fractional precipitation to separate nickel and iron elements. The iron element is separated in the form of Fe(OH)3, and the final product is obtained in the form of nickel element in the form of NiS or Ni(OH)2. The invention not only has strong process versatility, can separate and treat waste stainless steel pickling liquids with different concentrations, but also has the characteristics of low cost, easy control of process conditions, simple equipment, high recovery rate of valuable metal elements, and the like. The invention can effectively solve the sewage pollution problem of stainless steel production enterprises, and at the same time, the recovered metal elements can be reused to increase the economic benefits of the enterprise, and has double positive significance of environmental protection and resource utilization.

Description

technical field [0001] The invention belongs to the technical field of resource recycling and reuse in environmental protection and industrial production, and in particular relates to a method for recycling and treating waste pickling liquid of stainless steel containing iron, chromium and nickel. Background technique [0002] Wastewater and waste residues containing heavy metal elements will be produced in industrial production in some different fields. These heavy metal elements are quite harmful to the natural environment and ecological balance. If these industrial wastes cannot be properly treated, heavy metal elements may be converted into more toxic compounds after flowing into the natural environment, and enter the living body through the ecological cycle of nature, especially posing a threat to human life and health. These heavy metals include elements such as nickel and chromium, which cannot be decomposed in water, and are easy to accumulate and difficult to remove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G49/02C01G37/00C01G53/04
Inventor 高远飞张晓莉谢明森朱原原谢海泉
Owner NANYANG NORMAL UNIV
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