Method for removing nickel and chromium in acid pickling waste liquid

A technology of pickling waste liquid and nickel-chromium, which is applied in chemical instruments and methods, metallurgical wastewater treatment, neutralized water/sewage treatment, etc., can solve the problems of complex treatment process and unfavorable large-scale treatment of pickling waste liquid, and achieve Simple operation, less loss and less pollution

Pending Publication Date: 2021-03-16
江门市泰汇环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the treatment method of the above-mentioned pickling waste liquid can reduce the amount of nickel ions in the was

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0023] Example 1

[0024] A method for removing nickel and chromium in a pickling waste liquid, when the pickling waste liquid is a sulfuric acid pickling waste liquid, the method comprises the following steps:

[0025] (1) the pickling waste liquid to be treated is subjected to coarse filtration to remove the larger insoluble impurities of particle size, and the to-be-treated filtrate is collected;

[0026] (2) detect the pH value of the filtrate to be treated, when pH3.5, add sulfuric acid solution to adjust the pH of the filtrate to be treated to 3, the reactor is closed Isolate the air, add iron powder with a particle size of 100 mesh under stirring, and the dosage of iron powder in the filtrate to be treated is 750 mg / L, heat the steam to 80 ° C, and continue to stir for 180 min. After solid-liquid separation, the liquid is collected;

[0027] (3) put the nano-iron powder into the liquid collected in step (2), the nano-iron powder is obtained by ultrasonic dispersion tre...

Example Embodiment

[0029] Example 2

[0030] A method for removing nickel and chromium in a pickling waste liquid, when the pickling waste liquid is a sulfuric acid pickling waste liquid, the method comprises the following steps:

[0031] (1) the pickling waste liquid to be treated is subjected to coarse filtration to remove the larger insoluble impurities of particle size, and the to-be-treated filtrate is collected;

[0032] (2) detect the pH value of the filtrate to be treated, when pH3.5, add sulfuric acid solution to adjust the pH of the filtrate to be treated to 3, the reaction kettle Airtight and isolated from the air, add iron powder with a particle size of 100 mesh under stirring, and the dosage of iron powder in the filtrate to be treated is 500 mg / L, and the steam is heated to 90 ° C, and the solid-liquid separation is carried out after continuous stirring for 150 min, and the liquid is collected. ;

[0033] (3) put the nano-iron powder into the liquid collected in step (2), the nan...

Example Embodiment

[0035] Example 3

[0036] A method for removing nickel and chromium in a pickling waste liquid, when the pickling waste liquid is a sulfuric acid pickling waste liquid, the method comprises the following steps:

[0037] (1) the pickling waste liquid to be treated is subjected to coarse filtration to remove the larger insoluble impurities of particle size, and the to-be-treated filtrate is collected;

[0038] (2) detect the pH value of the filtrate to be treated, when pH3.5, add sulfuric acid solution to adjust the pH of the filtrate to be treated to 3, the reactor is closed Isolate the air, add iron powder with a particle size of 100 mesh in a stirring state, the dosage of iron powder in the filtrate to be treated is 1000 mg / L, heat the steam to 100 ° C, and continue to stir for 120 min. After solid-liquid separation, the liquid is collected;

[0039] (3) put the nano-iron powder into the liquid collected in step (2), the nano-iron powder is obtained by ultrasonic dispersion ...

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Abstract

The invention relates to a method for removing nickel and chromium in acid pickling waste liquid, belongs to the field of heavy metal wastewater treatment, and provides the following technical schemeaiming at the problems that the existing acid pickling waste liquid treatment technology is complex in operation and difficult in mass treatment, and the method comprises the following steps: (1) conducting rough filtering to remove insoluble substances in the acid pickling waste liquid; (3) adjusting the pH of to-be-treated liquid, sealing a reaction kettle to isolate air, adding iron powder, andconducting stirring; (4) adding nano iron powder, and continuously conducting stirring; and (5) carrying out solid-liquid separation to finish the operation of removing nickel and chromium in the pickling waste liquid. The treatment process is simple, the cost is low, and a large amount of pickling waste liquid can be conveniently treated.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, more specifically, it belongs to a method for removing nickel and chromium in pickling waste liquid. Background technique [0002] In the processing and production of steel products, the prepared steel or metal products are usually subjected to surface pickling operations, the purpose of which is to remove the rust or dirt attached to the surface of the steel or metal products during processing. Therefore, the pickling process In addition to ferrous ions, the generated waste liquid also contains heavy metal ions such as nickel and chromium. If these industrial wastewaters are discharged directly without treatment, they will cause serious pollution to the environment and even endanger human health. [0003] In order to reduce the damage to the environment caused by the processing and production of steel products, the waste pickling liquid should be treated before being discharged fr...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20C02F101/22C02F103/16
CPCC02F9/00C02F2103/16C02F2101/20C02F2101/22C02F1/70C02F1/705C02F1/66C02F1/001
Inventor 薛剑锋
Owner 江门市泰汇环保科技有限公司
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