Recovery processing method of stainless steel acid pickling waste liquid containing iron, chromium and nickel

A technology for pickling waste liquid, recycling and processing, applied in the recovery and treatment of nickel stainless steel pickling waste liquid, chromium, iron-containing fields, can solve the problems of environmental pollution of pickling waste liquid, and achieve the goal of protecting the ecological environment and creating economic benefits. Effect

Inactive Publication Date: 2015-07-22
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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  • Recovery processing method of stainless steel acid pickling waste liquid 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 for ...

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 recovery processing method of stainless steel acid pickling waste liquid containing iron, chromium and nickel. The recovery processing method comprises the following steps: (1) oxidizing chrome (III) ions in an alkaline condition, and separating the oxidized chrome (III) ions from iron and nickel; (2) reducing chrome in an acidic condition to trivalent chrome, and precipitating the trivalent chrome in the form of hydroxide; (3) separating nickel and iron elements through the ammonia leaching or fractional precipitation method, separating the iron elements in the form of Fe (OH)3, and obtaining the final product of the nickel element in the form of NiS or Ni(OH)2. According to the invention, the technological universality is high, the stainless steel acid pickling waste liquid with different concentrations can be separated, the characteristics of low cost, easiness in control of technological conditions, simple equipment and high recycling rate of valuable metal elements are realized, the problem about the sewage pollution of a stainless steel production enterprise can be effectively solved, the recycled metal elements can be reutilized, the economic benefit of the enterprise can be increased, and the dual significances of environmental protection and resource utilization are realized.

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 Applications(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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