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Process for treating industrial waste hydrochloric acid in recycling way through salt fractionation method

A waste hydrochloric acid and recycling technology, applied in the purification of ferric halide, chlorine/hydrogen chloride, chlorine/hydrogen chloride, etc., can solve the problem of no salting-out method to treat waste hydrochloric acid, etc., and achieve the advantages of small investment, reduced processing cost, and increased concentration. Effect

Inactive Publication Date: 2015-04-08
TIANJIN VOCATIONAL INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] Through the search, no published patent documents have been found that use the salting-out method to treat waste hydrochloric acid

Method used

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  • Process for treating industrial waste hydrochloric acid in recycling way through salt fractionation method
  • Process for treating industrial waste hydrochloric acid in recycling way through salt fractionation method
  • Process for treating industrial waste hydrochloric acid in recycling way through salt fractionation method

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0029] The process for treating industrial waste hydrochloric acid involved in the present invention adopts a corresponding treatment system to process waste hydrochloric acid. In order to describe the process of the present invention more clearly, the applicant first explains the structure of the processing system:

[0030] This system includes iron powder reactor, waste hydrochloric acid ferrous chloride mixer, ferrous chloride crystallization tank, ferrous chloride finished product tank, washing tower, hydrochloric acid finished product tank, spray tower, neutralization tank, calcium chloride Crystallization tank, calcium chloride collection tank and exhaust machine, the front end of the iron powd...

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Abstract

The invention relates to a process for treating industrial waste hydrochloric acid in a recycling way through a salt fractionation method. The treatment of the industrial waste hydrochloric acid is carried out in a treatment system, and the treatment process comprises the following steps of: (1) iron powder reaction; (2) mixing of ferrous chloride; (3) neutralization and crystallization of ferrous chloride; (4) recycling of a ferrous chloride crystal or solution; (5) neutralization and crystallization of calcium chloride; (6) condensing and absorbing a separated gas. According to the process, the ferrous chloride crystal or solution is added to the industrial waste hydrochloric acid by utilizing common-ion effect, concentration is carried out under the conditions of negative pressure and heating, the separated gas can be partially condensed into hydrochloric acid for recycling, the rest is absorbed by using calcium oxide or calcium hydroxide, and finished products are ferrous chloride, calcium chloride and hydrochloric acid, so that secondary pollution can not be caused, and small investment and low operation cost are achieved. The process disclosed by the invention is a new process for realizing the recycling application of the industrial waste hydrochloric acid and has wide application prospect.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to the treatment of industrial waste hydrochloric acid, in particular to a process for recycling industrial waste hydrochloric acid by a salting-out method. Background technique [0002] As a commonly used chemical product, hydrochloric acid is widely used in carbon steel cold rolling, galvanizing and other processes. As a pickling medium, hydrochloric acid reacts with iron oxide on the surface of steel to generate ferrous chloride and ferric chloride and dissolve them in the acid solution. In the hydrochloric acid waste liquid that this reaction produces, contain the hydrochloric acid of 5% and the ferrous chloride of 10-12%, if directly discharge this part hydrochloric acid waste liquid, will cause serious environmental pollution to discharge area. In addition, the waste acid liquid contains ferrous chloride and hydrogen chloride, which can be considered as very good chemica...

Claims

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Application Information

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IPC IPC(8): C01G49/10C01F11/24C01B7/07
Inventor 王少杰刘炳光魏鹏汤越王泽乾曹雅静苏忠丹张海莹
Owner TIANJIN VOCATIONAL INST
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