CN1114717C - Method for treating waste liquor from acid pickling steel plate with hydrochloric acid - Google Patents
Method for treating waste liquor from acid pickling steel plate with hydrochloric acid Download PDFInfo
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- CN1114717C CN1114717C CN 01108273 CN01108273A CN1114717C CN 1114717 C CN1114717 C CN 1114717C CN 01108273 CN01108273 CN 01108273 CN 01108273 A CN01108273 A CN 01108273A CN 1114717 C CN1114717 C CN 1114717C
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- hydrochloric acid
- film evaporator
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Abstract
The present invention relates to a method for treating waste liquid of the pickling of steel plates by using hydrochloric acid, and the main constituents of the waste liquid are hydrochloric acid and ferrous chloride. The method is characterized in that the waste liquid is put into a climbing film evaporator to be evaporated and is evaporated by a falling film evaporator; hydrochloric acid gas generated by the climbing film evaporator and the falling film evaporator becomes recovered hydrochloric acid after being cooled down by a condenser; ferrous chloride solids are obtained by cooling down and centrifugating high-temperature residual liquid generated by the falling film evaporator. By using the method, the labor intensity of workers can be decreased. The method has the advantages of low treatment cost and no pollution to environment and achieves the standards of zero discharge, and simultaneously, the recycle of waste has good economic benefit.
Description
The invention belongs to field of waste water treatment, be applicable to that steel plate or processing component clean the liquid waste disposal that is produced through hydrochloric acid.
Steel plate or steel band produce ferric oxide on the surface in the operation of rolling, China adopts hydrochloric acid as the pickle solution pickled plate since the later stage eighties, produces a large amount of spent pickle liquors, annual discharge 100 ten thousand steres, and concentration of hydrochloric acid is about about 8% in the waste liquid, Fe
2+Content is about 120g/l, as these waste liquids are not carried out processing and utilizing, both can cause environmental pollution, will waste resource again, and handling hydrochloric acid pickling waste liquor at present has following several method:
1. neutralisation is used always in the milk of lime and spent acid solution, makes the pH value reach the 6-9 emission standard.This method is simple.Shortcoming is: a large amount of free acids (4%-8%) are not utilized in the waste liquid, and equipment attrition is bigger, and labour intensity is big, and hygienic condition are poor, and processing cost is higher, and many middle-size and small-size slab yards adopt this method at present.
2. direct roasting method high-temperature roasting spent acid solution becomes hydrochloric acid and brown iron oxide with the iron protochloride redox, and Ruthner method and Lurgi method are arranged at present, advantage is: the basic realization with sour self-sufficient, shortcoming is: investment is big, and equipment corrosion is serious, maintenance maintenance expense height, system complex, secondary pollution is arranged, and owing to these reasons, the China that is applied in of direct roasting method is subjected to certain restriction, to middle-size and small-size iron and steel enterprise, working cost then is difficult to bear.
3. dialysis partition method it by means of dialyzer, utilize the difficult saturating molysite of its easily saturating hydrochloric acid that hydrochloric acid in the waste liquid and molysite are separated, closed circuit special ring of its characteristics, but that shortcoming is a treatment capacity is less, the industrialization difficulty is bigger.
The objective of the invention is provides the treatment process of the waste liquor from acid pickling steel plate with hydrochloric acid that a kind of labour intensity is little, processing cost is low at the characteristics of steel mill's spent pickle liquor and the deficiency of above-mentioned treatment process.
The technical scheme that realizes above-mentioned purpose is: a kind of treatment process of waste liquor from acid pickling steel plate with hydrochloric acid, its waste liquid major ingredient is hydrochloric acid and iron protochloride, waste liquid enters climbing-film evaporator and evaporates, again through the falling-film evaporator evaporation, the hydrochloric acid gas that climbing-film evaporator and falling-film evaporator produce becomes recovery hydrochloric acid after cooling off through condenser, and the high temperature raffinate that falling-film evaporator produces obtains the iron protochloride solid after overcooling, separation.
After adopting technique scheme, the entire treatment system is totally-enclosed system, reaches the zero release standard, not only solved environmental issue, and waste reclaimation has favorable economic benefit.
Just the present invention is further detailed explanation with enforcement below in conjunction with accompanying drawing.
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 is a process frame chart of the present invention.
As Fig. 1, shown in 2, a kind of treatment process of waste liquor from acid pickling steel plate with hydrochloric acid, its waste liquid main component is hydrochloric acid and iron protochloride, waste liquid at first enters under meter 9 from header tank 1 by pipeline 11, through after the preheating, enter climbing-film evaporator 2 by pipeline 11, again through falling-film evaporator 3 evaporations, and control certain input speed and heating steam temperature, the hydrochloric acid gas that climbing-film evaporator 2 produces becomes recovery hydrochloric acid after cooling off through graphite condenser 7, the hydrochloric acid gas that falling-film evaporator 3 produces becomes recovery hydrochloric acid after cooling off through graphite condenser 6 through climbing-film evaporator 2 earlier again, recovery hydrochloric acid in graphite condenser 6 and the graphite condenser 7 enters hydrochloric acid storage tank 8 from pipeline 11, the high temperature raffinate that falling-film evaporator 3 produces enters cooling reactor 4 coolings, 5 separation obtain the iron protochloride solid through whizzer, simultaneously, centrifuge mother liquor enters Lower tank 10, squeezes into header tank 1 recovery again and uses.
As shown in Figure 1, falling-film evaporator 3 is by the water vapor heating, and climbing-film evaporator 2 is by the hydrochloric acid gas heating of falling-film evaporator 3 generations.Adopt this method, energy is fully utilized.
Climbing-film evaporator 2 and falling-film evaporator 3 all can adopt graphite evaporator.Adopt graphite evaporator can prevent the corrosive nature of hydrochloric acid.
Claims (3)
1, a kind of treatment process of waste liquor from acid pickling steel plate with hydrochloric acid, its waste liquid major ingredient is hydrochloric acid and iron protochloride, it is characterized in that: waste liquid enters climbing-film evaporator (2) and evaporates, pass through falling-film evaporator (3) evaporation again, the hydrochloric acid gas that climbing-film evaporator (2) and falling-film evaporator (3) produce becomes recovery hydrochloric acid after cooling off through condenser, and the high temperature raffinate that falling-film evaporator (3) produces obtains the iron protochloride solid after overcooling, separation.
2, the treatment process of waste liquor from acid pickling steel plate with hydrochloric acid according to claim 1 is characterized in that: falling-film evaporator (3) is by water vapor heating, the hydrochloric acid gas heating that climbing-film evaporator (2) is produced by falling-film evaporator (3).
3, the treatment process of waste liquor from acid pickling steel plate with hydrochloric acid according to claim 1 and 2 is characterized in that: climbing-film evaporator (2) and falling-film evaporator (3) are graphite evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108273 CN1114717C (en) | 2001-02-28 | 2001-02-28 | Method for treating waste liquor from acid pickling steel plate with hydrochloric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108273 CN1114717C (en) | 2001-02-28 | 2001-02-28 | Method for treating waste liquor from acid pickling steel plate with hydrochloric acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1321794A CN1321794A (en) | 2001-11-14 |
| CN1114717C true CN1114717C (en) | 2003-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01108273 Expired - Fee Related CN1114717C (en) | 2001-02-28 | 2001-02-28 | Method for treating waste liquor from acid pickling steel plate with hydrochloric acid |
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| Country | Link |
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| CN (1) | CN1114717C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10231308C5 (en) * | 2002-07-10 | 2009-10-15 | Cmi Uvk Gmbh | Process and apparatus for recycling stainless steel pickling baths |
| CN100369804C (en) * | 2006-05-29 | 2008-02-20 | 冶金部建筑研究总院上海分院 | Regenerating acid method by sulfuric acid substitution |
| CN101172727B (en) * | 2007-10-16 | 2010-05-19 | 中冶南方工程技术有限公司 | Waste hydrochloric acid liquid cleaning treatment technique |
| CN101767847B (en) * | 2010-02-10 | 2013-08-14 | 大连屹东膜工程设备有限公司 | Method for purifying and recycling acid waste liquor based on membrane technology |
| CN104098213A (en) * | 2014-06-29 | 2014-10-15 | 扬州祥发资源综合利用有限公司 | Comprehensive recycling and utilizing method and device for ferrum-containing waste hydrochloric acid |
| CN106282577B (en) * | 2016-08-31 | 2018-01-05 | 重庆大学 | The recycling and processing method of a kind of stainless steel acid cleaning waste water |
| CN108394865B (en) * | 2018-04-04 | 2021-07-16 | 青海盐湖工业股份有限公司 | Hydrogen chloride analysis system and process thereof |
| CN111349065B (en) * | 2020-03-14 | 2022-08-30 | 大连新阳光材料科技有限公司 | Preparation method of 3,3',4,4' -diphenyl ether tetracarboxylic dianhydride |
| CN111607800A (en) * | 2020-06-24 | 2020-09-01 | 江苏苏讯新材料科技有限公司 | Stainless steel strip hydrochloric acid pickling circulation system and method thereof |
| CN112808171B (en) * | 2020-12-30 | 2023-01-31 | 邓会秋 | Pump valve-free corrosive liquid feeding system and process |
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2001
- 2001-02-28 CN CN 01108273 patent/CN1114717C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1321794A (en) | 2001-11-14 |
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