Cold-rolled acid wastewater resource and zero-emission method

A technology for recycling acidic wastewater, applied in chemical instruments and methods, metallurgical wastewater treatment, iron oxide, etc. Issues such as emission reports, to achieve good social and environmental benefits

Inactive Publication Date: 2017-05-10
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

[0008] The main problem of the lime neutralization process is that the treated wastewater has high conductivity and high calcium ion content, which is not conducive to subsequent desalination and reuse. The concentrated brine produced by desalination and reuse has no good outlet and can only be used for slag flushing Other occasions that do not require high water quality, but the impact on the subsequent use o

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  • Cold-rolled acid wastewater resource and zero-emission method

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[0033] Example 1

[0034] Cold-rolling pickling wastewater first enters the pretreatment system for filtration to filter out particulate matter above 5-30 μm. The filtration facilities and pipelines used need to be resistant to acid corrosion. Filters with fillers such as quartz sand and anthracite can be used, or inorganic ceramic membrane filtration or sintered organic membrane filtration can be used.

[0035] The backwash water produced by the filter backwash is mixed with dilute alkali wastewater, and the suspended solids in the backwash water are also mixed into the sludge produced by dilute alkali wastewater.

[0036] Firstly, the filtered pickling wastewater is heated at 50-100°C with low-temperature steam on site, enters the water storage tank, and is lifted to the membrane module by a circulating pump. The water vapor on the acidic wastewater side passes through the membrane and enters the steam side, where it is used The vacuum pump pumps the water vapor passing thr...

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Abstract

The invention relates to a cold-rolled acid wastewater resource and zero-emission method, which specifically comprises: (1) filtration pre-treatment: filtering cold-rolled acid washing wastewater as pre-treatment to filter out particles having a particle size of more than 5-30 [mu]m so as to obtain filtered acid washing wastewater; (2) membrane concentration: concentrating the filtered acid washing wastewater by using an efficient membrane concentration technology to obtain concentrated acid and pure water; and (3) acid regeneration: carrying out acid regeneration on the main components such as the acid and the Fe<2+> in the concentrated acid after the concentration with the membrane concentration process, the acid washing waste liquid and the like, wherein the acid generated during the acid regeneration process re-enters the acid washing system so as to be recycled, and the Fe<2+> finally form iron oxide red as the product for sale. According to the present invention, through the wastewater filtration, the membrane concentration and the acid regeneration, the resource recovery and utilizations of the acid and the water in the acid wastewater are respectively achieved, no sludge is generated, and the zero emission of the solid and the liquid is achieved.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of wastewater treatment, in particular to a method for recycling acidic wastewater from cold rolling and zero discharge. [0003] 【Background technique】 [0004] Pickling is one of the indispensable processes in cold rolling mills. During the production process, the cold-rolled steel needs to be pickled to remove the oxide scale on the steel surface, and after pickling, the steel surface needs to be rinsed with pure water to clean the residual acid on the steel surface. Therefore, acid pickling waste liquid and acid rinse water are produced. Usually, most of the waste acid in the pickling process is returned to the acid regeneration system for regeneration and reuse. The rinse water cannot be regenerated because the acid concentration is too low, so it can only be discharged. [0005] The patent application number is 200310120052.4, which relates to a neutralizer for treating cold-rolled acid wastew...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01G49/06C02F103/16
Inventor 侯红娟李恩超尹婷婷武晟殷玫婕丁宗琪邱煜施瑞康吴昊
Owner BAOSHAN IRON & STEEL CO LTD
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