Pickling waste acid regeneration process

A technology for pickling waste acid and hydrochloric acid, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of difficulty in cost recovery and large investment, and achieve the effects of reducing investment, small footprint and significant environmental protection significance.

Inactive Publication Date: 2008-11-19
NANTONG CHENGGUANG GRAPHITE EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] These methods are all considered to recycle waste pickling acid from the perspective of environmental protection, but these methods require a lot of investment, and it is difficult to recover the cost through waste acid recovery
Moreover, there are still many defects in the process

Method used

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  • Pickling waste acid regeneration process
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Embodiment Construction

[0035] The following examples illustrate the method for regenerating waste pickling acid of the present invention without limitation in conjunction with the accompanying drawings. Those of ordinary skill in the art can also make various changes and modifications to the present invention without departing from the spirit and scope of the present invention, but all equivalent technical solutions belong to the category of the present invention, and the protection of the present invention The scope is defined by the claims of the present application.

[0036] The pickling waste acid sent from the production workshop of pickling waste acid mainly contains hydrochloric acid, ferrous chloride and waste residue. After being stored in the waste acid storage tank, pumping and filtering are used to filter out dirt and impurities, and the pickling waste acid after filtration and purification (mainly containing the waste hydrochloric acid mixture of ferrous chloride, the content of ferrous...

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Abstract

The invention relates to a method for recycling acid washing waste acid. The invention provides a method for regenerating the acid washing waste acid which contains hydrochloric acid and ferrous chloride. The method comprises the following steps of filtration, preheating, multi-effect evaporation, combustion and separation of the acid washing waste acid. The method has the advantages of obvious reduction of the cost of a recovery system, reduction of the operating cost, simplification of system equipment, reduction of the energy consumption and achievement of regeneration and recycle of resources.

Description

[0001] The present invention application claims the priority right of Chinese invention application CN 200710021924.X. 【Technical field】 [0002] The invention relates to a method for recovering industrial pickling waste acid, in particular to a method for recovering iron oxide and hydrochloric acid from pickling waste acid containing ferrous chloride. 【Background technique】 [0003] In the steel rolling industry, steel wire rope industry, and electroplating industry, due to the needs of electroplating, bluing, steel rolling and other refined processes, the rust and oxide layer on the surface of steel products are usually washed with hydrochloric acid to preserve the steel products or carry out further processing. After pickling iron and steel materials with hydrochloric acid, its concentration is reduced to a certain level and contains a large amount of iron ions, so it no longer has pickling ability and becomes pickling waste acid. The traditional method of industrial wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/36C01G49/06
Inventor 黄健
Owner NANTONG CHENGGUANG GRAPHITE EQUIP
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