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A process for eliminating red smoke from waste acid regeneration unit

A technology of regeneration device and red smoke is applied in the technical field of eliminating red smoke from waste acid regeneration device, and can solve the problem of "red smoke from waste acid regeneration device".

Active Publication Date: 2015-11-25
CHENGDU HUAXI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a process for eliminating the red smoke from the waste acid regeneration device, so as to solve the problem of "red smoke" in the waste acid regeneration device in the prior art

Method used

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  • A process for eliminating red smoke from waste acid regeneration unit
  • A process for eliminating red smoke from waste acid regeneration unit
  • A process for eliminating red smoke from waste acid regeneration unit

Examples

Experimental program
Comparison scheme
Effect test

comparative approach 1

[0040] Supplementary acid comparison scheme 1: 18% regenerated acid is used for replacement. If the replacement is 10m3 / h per hour, it takes 82 minutes when the HCl concentration reaches 11.39%; when the HCl concentration reaches 14.21%, it takes 178 minutes. That is, in order to reach the standard HCl concentration and completely eliminate the phenomenon of red smoke, it takes too long for the dechlorination tower to reach the required concentration before the conversion operation.

comparative approach 2

[0041] Supplementary acid comparison scheme 2: If 18% regenerative acid is used for replacement, 25m per hour 3 / h, it takes 71min when the HCl concentration reaches 14.21%.

comparative approach 3

[0042] Supplementary acid comparison scheme 3: use 31% new hydrochloric acid, use 15m 3 / h for replacement, it takes 27min when the concentration of HCl reaches 14.21%; with 10m 3 / h for replacement, it takes 40 minutes for the HCl concentration to reach 14.21%.

[0043] From the above, it can be seen that using new hydrochloric acid (31% HCl new acid) as supplementary acid to supplement the dechlorination tower, when the concentration of hydrochloric acid in the dechlorination tower reaches the standard, the time spent is the shortest.

[0044] Secondly, after the concentration of HCl in the new circulating liquid in the dechlorination tower reaches 14% or more (it takes about 27 minutes), stop adding new hydrochloric acid and switch to supplementing regeneration acid; at this time, the preconcentrator directly enters the filter After the waste acid enters the dechlorination tower, it forms a circulating acid (liquid) and then goes to the waste acid tank; the specific operati...

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Abstract

The invention discloses a process for eliminating red fume discharged by a waste acid regenerating device and aims to solve the problem that the waste acid regenerating device has the phenomenon of discharging the red fume in the acid water conversion process in the prior art. According to the process, as a dechlorinating tower is added between a preconcentrator and an absorption tower, and new acid and regenerated acid are introduced into the dechlorinating tower, on one hand, the acid concentration of the preconcentrator is increased, and the purpose that a ferric oxide powder is fully reacted with free acid in the preconcentrator is reached; on the other hand, ultrafine ferric oxide powder enters the dechlorinating tower and is removed, so that the phenomenon that the acid regenerating device discharges the red fume can be completely avoided, and discharged tail gas of a roasting furnace can be fully ensured to reach Emission Standard of Air Pollutants for Steel Rolling Industry GB28665-2012 which is newly issued by the country. Therefore, the process is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of waste liquid treatment, and in particular relates to a process for eliminating red smoke from a waste acid regeneration device. Background technique [0002] In the cold rolling pickling factory, when using hydrochloric acid solution to pickle the steel plate, the iron oxide on the surface of the plate is washed off by hydrochloric acid to form ferrous chloride or ferric chloride is dissolved in the pickling solution to form waste acid. Along with the carrying out of pickling process, the ferric ion concentration in waste acid solution can increase, and the concentration of free HCl decreases accordingly, in order to keep the free HCl concentration in pickling solution, remove the ferric ion that increases in pickling solution, Quantitatively send the waste acid solution to the waste acid regeneration device, and regenerate the free HCl acid liquid through the waste acid regeneration device, that is, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/36
Inventor 苏宗华宋兵
Owner CHENGDU HUAXI CHEM TECH CO LTD
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