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Waste acid and wastewater reuse production process for hot galvanizing

A production process and hot-dip galvanizing technology, which can be used in metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Effect

Active Publication Date: 2014-04-30
CHANGSHU FENGFAN POWER EQUIP
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Problems solved by technology

The usual method is to heat the temperature of the fluxing solution to above 65°C, and then add hydrogen peroxide oxidant to make the ferrous salt become ferric salt precipitation, but if the ferrous salt content is too high, only discharge and redistribution is required, which is quite inconvenient

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  • Waste acid and wastewater reuse production process for hot galvanizing

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Embodiment Construction

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] A kind of hot-dip galvanized waste acid waste water reuse production process, such as figure 1 As shown, the production process steps include:

[0020] (1) Electrolyze hot-dip galvanized reuse water with an ion generator to generate chlorine gas and generate sodium hydroxide solution;

[0021] (2) Pass the plating flux in the plating flux into the flux spray tower, and send the chlorine gas generated in the ion generator into the flux spray tower through the induced draft fan to react with the flux, and The ...

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Abstract

The invention discloses a waste acid and wastewater reuse production process for hot galvanizing. The production process comprises the following steps: (1) electrolyzing reuse water of hot galvanizing to generate chlorine and sodium hydroxide liquor; (2) introducing assistant plating liquor to a spraying tower and sending the chlorine to the spraying tower to react with the assistant plating liquor, returning the generated liquor to an assistant plating tank, and adjusting pH value by ammonium water to obtain a precipitate; (3) pumping rinse water to the spraying tower by a pump to react with the chlorine, returning the generated liquor to a treatment tank, introducing the sodium hydroxide liquor into the treatment tank for treatment to obtain a precipitate; and (4) inputting the precipitates obtained in the steps 2 and 3 into a waste acid treatment pool to react with hydrochloric acid, and after the hydrochloric acid is fully consumed, introducing the chlorine, and completely consuming the residual precipitate to generate new liquor. The production process disclosed by the invention has the advantages that the investment of integral equipment of waste acid and wastewater assistant liquor treatment in the hot galvanizing industry is reduced, thus the cost is reduced, the resources are saved, and waste is turned into wealth by recycling.

Description

technical field [0001] The invention relates to the field of hot-dip galvanizing, in particular to a hot-dip galvanizing waste acid waste water recycling production process. Background technique [0002] Hydrochloric acid is usually used for pickling steel parts in the hot-dip galvanizing production process. In addition, ferrous ions will be produced during the absorption process. When the ferrous ions in hydrochloric acid reach 200g-300g / L, the ferric ions in hydrochloric acid will be saturated. When the acid concentration drops to 5-8%, it is generally not used, and can only be treated as waste acid. Most factories of waste acid outsource the treatment of waste acid by paying fees. [0003] Steel parts after pickling need water to rinse the surface, which is called rinsing. Pickling steel parts continuously brings acid and ferrous ions into the rinsing water. The process requires that the less ferrous ions in the water body, the better, so the water must be treated regu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/16
Inventor 赵金元赵月华顾小蕾
Owner CHANGSHU FENGFAN POWER EQUIP
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