Resource recycling process of galvanizing waste acid

A recycling and waste acid technology, applied in zinc halides, chemical instruments and methods, calcium/strontium/barium halides, etc., can solve the problems of high operating costs, high energy consumption, and high investment costs, and simplify the subsequent processing process , Simple processing and low cost

Pending Publication Date: 2020-01-14
YUNNAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a recycling process of waste galvanizing acid, in order to solve the long-standing problems of high investment cost, high operating cost, and high energy consumption in the field of waste galvanizing acid treatment and resource recycling

Method used

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  • Resource recycling process of galvanizing waste acid

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Embodiment

[0027] Required equipment: pH adjustment pool, adsorption reaction box, high gradient magnetic separator, desorption reaction box, sedimentation tank, filter press, pH value detector, Zn 2+ Content analysis detector.

[0028] 1. Adjust pH

[0029] Taking the pH adjustment pool built by Kunming Yuegao Industry and Trade Technology Co., Ltd. as an example, its volume is 10m 3 . The specific gravity of galvanizing waste acid solution from Yunnan Jinling Material Technology Co., Ltd. is 1.41, 1m 3 About 1.41 tons. The pH value of the solution is detected in real time by a pH analyzer, and an appropriate amount of limestone (mainly composed of CaCO2) is automatically added in real time according to the detection result 3 ), the pH value of the control galvanizing wastewater is about 5, and the reaction is carried out at normal temperature.

[0030] According to statistics, 500.0kg of limestone is needed to control the pH value of galvanizing wastewater to about 5.

[0031] 2....

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Abstract

The invention belongs to the technical field of waste acid treatment and resource recycling, and particularly relates to a resource recycling process of galvanizing waste acid The process comprises the following steps: introducing the galvanizing waste acid into a pH regulating tank, adding a proper amount of limestone into the pH regulating tank, and regulating a pH value to 4-6; introducing thegalvanizing wastewater with the adjusted pH value into an adsorption reaction box; adding hydrochloric acid into the desorption reaction box; after reacting for a period of time, introducing a solution into a high-gradient magnetic separator; and introducing a residual solution in a high-gradient magnetic separator in the step 2 into a sedimentation tank, and adding a proper amount of quick lime into the sedimentation tank to completely precipitate Fe<2+> in the solution. The invention aims to solve the long-standing problems of high investment cost, high operation cost, high energy consumption and the like in the field of treatment and resource recycling of galvanizing waste acid.

Description

technical field [0001] The invention belongs to the technical field of waste acid treatment and resource recycling, and in particular relates to a resource recycling process of galvanizing waste acid. Background technique [0002] The main components of galvanizing waste acid produced during the process of galvanizing the surface of steel parts in galvanizing plants are: 5%-15% zinc, 15%-20% iron, and 5%-10% hydrochloric acid. Because galvanizing waste acid contains heavy metal zinc, and the acid content and salt content are high, it cannot be discharged directly, and it brings difficulties to the post-treatment process of galvanizing waste acid. [0003] At present, there are two main treatment methods for galvanizing waste acid: one is the acid-base neutralization method, and the acid-base neutralization method is to add alkaline substances to precipitate metal ions and neutralize the acid in the solution at the same time, and the metal ions The sediment is sent as sludge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C01G9/04C01G49/02C01F11/24B03C1/025
CPCB03C1/025C01F11/24C01G9/04C01G49/02C02F1/001C02F1/481C02F1/5236C02F1/66C02F9/00
Inventor 汤立红吴昊天
Owner YUNNAN UNIV
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