Online hydrochloric acid cyclic utilization method and device on steel acid pickling line

A technology of hydrochloric acid circulation and pickling line, applied in the field of steel pickling, can solve the problems of inability to directly discharge waste acid, high cost, environmental pollution, etc., to avoid waste acid treatment costs and acid replacement costs, reduce energy consumption, The effect of protecting the environment

Active Publication Date: 2016-11-09
TIANJIN RUNJIE INNOVATION ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The obtained waste acid cannot be discharged directly. In order to recycle and utilize these waste acid liquid and ferrous chloride, a relatively large investment is required to build corresponding recovery and treatment equipment
The discharge of waste acid in our country is very huge, and most of the small and medium-sized enterprises have not put into operation the waste acid regeneration device. Under the current situation, many enterprises discharge secretly. Once the direct discharge occurs, it will cause serious pollution to the environment.

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  • Online hydrochloric acid cyclic utilization method and device on steel acid pickling line

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Embodiment Construction

[0032] The on-line hydrochloric acid recycling method and its device on the steel pickling line of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0033] Such as figure 1 Shown, the on-line hydrochloric acid recycling method on steel pickling line of the present invention, comprises the following steps:

[0034] Step 1, collect the pickling liquid containing ferrous chloride and hydrochloric acid on the pickling line 1, and transport it to the first filter device 2 to filter out the solid impurities, and then transport the pickling liquid to the vapor-liquid separator 3;

[0035] Step 2, the dosing device 4 adds oxalic acid to the vapor-liquid separator 3, so that the oxalic acid and the pickling liquid are fully reacted by stirring and mixing in the vapor-liquid separator 3;

[0036] Step 3, the mixed liquid is forced to circulate between the vapor-liquid separator 3 and the acid-resistant and high-temper...

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Abstract

The invention discloses an online hydrochloric acid cyclic utilization method on a steel acid pickling line. The method includes the following steps that firstly, acid pickling liquid on the acid pickling line is collected and filtered and is conveyed to a vapor-liquid separator; secondly, oxalic acid is added into the vapor-liquid separator through a chemical adding device; thirdly, mixed liquid is forcefully cycled between the vapor-liquid separator and an acid-resisting and high-temperature-resisting heating evaporation device, acid vapor and a super-saturated solution containing ferrous oxalate crystals are formed, and the acid vapor is conveyed to the acid pickling line; fourthly, a crystallizing tank is used for separating out ferrous oxalate and conveying the ferrous oxalate to a second filtering device; fifthly, the ferrous oxalate crystals are filtered through the second filtering device; and sixthly, the above steps are repeated. According to the online hydrochloric acid cyclic utilization method on the steel acid pickling line, low-concentration hydrochloric acid obtained after acid pickling is converted into high-concentration hydrochloric acid which can be cyclically used through the oxalic acid and is conveyed to the acid pickling line again, meanwhile, due to the reaction of the oxalic acid and ferrous chloride, the ferrous oxalate is generated and can also be used as a raw material of lithium batteries and the like, cost is saved, and profits are generated.

Description

technical field [0001] The invention relates to the technical field of steel pickling, in particular to an online hydrochloric acid recycling method and device on a steel pickling line. Background technique [0002] The hot-rolled strip and steel coil produced by the hot rolling mill is rolled and coiled. The oxide scale formed on the surface of the strip under corresponding conditions can firmly cover the surface of the strip and cover the surface of the strip. Defects. Iron oxide scale will damage the surface of the roll during cold rolling and cause defects on the surface of the strip steel. Therefore, the strip steel must be pickled to remove the scale on the surface of the raw material coil that is harmful to cold rolling before cold rolling. [0003] At present, there are a large number of cold-rolled steel strips, pickled steel strips, steel pipes, steel wires and other production lines in the country. During the deep processing of their products, the surface needs t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/36C23G3/02
CPCC23G1/36C23G3/025
Inventor 郝聿铭
Owner TIANJIN RUNJIE INNOVATION ENVIRONMENTAL PROTECTION TECH
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