CN105540683A - Method for preparing FeCl3 in filler tower by using iron-steel hydrochloric acid washing waste liquid - Google Patents
Method for preparing FeCl3 in filler tower by using iron-steel hydrochloric acid washing waste liquid Download PDFInfo
- Publication number
- CN105540683A CN105540683A CN201410595858.7A CN201410595858A CN105540683A CN 105540683 A CN105540683 A CN 105540683A CN 201410595858 A CN201410595858 A CN 201410595858A CN 105540683 A CN105540683 A CN 105540683A
- Authority
- CN
- China
- Prior art keywords
- feed liquid
- waste liquid
- hydrochloric acid
- fecl3
- acid washing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Abstract
The invention relates to a method for preparing FeCl3 in a filler tower by using an iron-steel hydrochloric acid washing waste liquid, and belongs to the field of iron-steel processing industry waste liquid treatment. In the prior art, the acid washing waste liquid is not recovered and utilized. Based on the problem in the prior art, the invention provides a method for converting FeCl2 in an acid washing waste liquid into FeCl3. According to the present invention, the acid washing waste liquid and the hydrochloric acid are adopted as the raw materials and the catalytic oxidation reaction is performed in the filler tower to generate FeCl3; and with the method, the resource utilization of the acid washing waste liquid is achieved, the production process is simple, and the produced FeCl3 can be used for preparing the water treatment agent of a variety of iron salts.
Description
Technical field
The invention belongs to iron and steel processing industry field of waste liquid treatment.
Background technology
In order to remove steel surface iron scale in iron and steel processing industry, use hydrochloric acid to carry out pickling, can produce a large amount of hydrochloric acid pickling waste liquors in acid cleaning process, in waste liquid, general hydrochloric acid massfraction is about 3% ~ 5%, FeCl
2be about 17% ~ 22%, if rationally do not disposed, serious pollution can be caused to environment.
Summary of the invention
The object of this invention is to provide that a kind of technique is simple, production cost is low, can by FeCl in waste liquid
2be converted into FeCl
3method.
The present invention is achieved by the following technical programs: one utilizes steel hydrochloric acid pickling waste liquid to prepare FeCl in packing tower
3method, spent pickle liquor and hydrochloric acid are pressed n (FeCl
2): n (HCl)=l:l is made into feed liquid, by feed liquid preheating, feed liquid enters packing layer through recycle pump outer circulation from the pouring of packing tower top spray, sodium nitrite in aqueous solution catalyzer is added bottom packing tower, pass into oxygen simultaneously, maintain reaction pressure in reaction process at 0.01 ~ 0.02MPa, temperature of reaction 60 ~ 80 DEG C, serial sampling, measures Fe
2+content, directly causes Fe
2+complete oxidation, generates FeCl
3, tail gas adopts alkali liquor absorption.
Described feed liquid is preheating to 60 DEG C.
Bottom packing tower, 1m is added after described feed liquid preheating
3remain feed liquid after feed liquid to be circulated by recycle pump.
Described feed liquid circular flow is 6m
3/ h.
The present invention has following beneficial effect:
Achieve the utilization of resources of spent pickle liquor, conversion process is simple, and production cost is low, the FeCl of generation
3can be used for preparing the water conditioner of various molysite.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.
Specific embodiment: the present invention is as follows according to principle, and the catalyzed oxidation of Fe2+ mainly contains two kinds of approach, respectively:
Approach one:
2N0+0
2=2N0
2
2HCl+N0
2+2FeCl
2=2FeCl
3+N0+H
20
Approach two:
Fe
2++N0=Fe[N0]
2+
4Fe[N0]
2++0
2+4H
+=4Fe
3++4N0+2H
20
Spent pickle liquor and hydrochloric acid are pressed n (FeCl by the present invention
2): n (HCl)=l:l is made into feed liquid, feed liquid is preheating to 60 DEG C, adds 1m after preheating bottom packing tower
3feed liquid, feed liquid enters packing layer through recycle pump outer circulation from the pouring of packing tower top spray, and feed liquid circular flow is 6m
3/ h, adds sodium nitrite in aqueous solution catalyzer bottom packing tower, and the amount of catalyzer is that 0.3%(add-on is in the massfraction of raw material total mass), pass into oxygen simultaneously, maintain reaction pressure in reaction process at 0.01 ~ 0.02MPa, temperature of reaction 60 ~ 80 DEG C, serial sampling, measures Fe
2+content, directly causes Fe
2+complete oxidation, generates FeCl
3, whole reaction process continues 80 ~ 120min, and tail gas adopts alkali liquor absorption.
FeCl described in the embodiment of the present invention
3preparation method, achieves the utilization of resources of spent pickle liquor, and production process is simple simultaneously, and the time is short, and cost is low, the FeCl of preparation
3can as molysite class water conditioner raw material.
Above content is the further description done the present invention in conjunction with concrete embodiment, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. one kind utilizes steel hydrochloric acid pickling waste liquid to prepare FeCl in packing tower
3method, it is characterized in that: by spent pickle liquor and hydrochloric acid by n (FeCl
2): n (HCl)=l:l is made into feed liquid, by feed liquid preheating, feed liquid enters packing layer through recycle pump outer circulation from the pouring of packing tower top spray, sodium nitrite in aqueous solution catalyzer is added bottom packing tower, pass into oxygen simultaneously, maintain reaction pressure in reaction process at 0.01 ~ 0.02MPa, temperature of reaction 60 ~ 80 DEG C, serial sampling, measures Fe
2+content, directly causes Fe
2+complete oxidation, generates FeCl
3, tail gas adopts alkali liquor absorption.
2. the method for claim 1, is characterized in that: described feed liquid is preheating to 60 DEG C.
3. method as claimed in claim 1 or 2, is characterized in that: bottom packing tower, add 1m after described feed liquid preheating
3remain feed liquid after feed liquid to be circulated by recycle pump.
4. method as claimed in claim 3, is characterized in that: described feed liquid circular flow is 6m
3/ h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410595858.7A CN105540683A (en) | 2014-10-30 | 2014-10-30 | Method for preparing FeCl3 in filler tower by using iron-steel hydrochloric acid washing waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410595858.7A CN105540683A (en) | 2014-10-30 | 2014-10-30 | Method for preparing FeCl3 in filler tower by using iron-steel hydrochloric acid washing waste liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105540683A true CN105540683A (en) | 2016-05-04 |
Family
ID=55820318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410595858.7A Pending CN105540683A (en) | 2014-10-30 | 2014-10-30 | Method for preparing FeCl3 in filler tower by using iron-steel hydrochloric acid washing waste liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105540683A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745321A (en) * | 2016-12-27 | 2017-05-31 | 唐山市斯瑞尔化工有限公司 | The production method of graininess Iron(III) chloride hexahydrate |
| CN111153439A (en) * | 2020-01-14 | 2020-05-15 | 斯瑞尔环境科技股份有限公司 | Process for producing ferric chloride or polyferric chloride by continuous oxygen oxidation method |
-
2014
- 2014-10-30 CN CN201410595858.7A patent/CN105540683A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745321A (en) * | 2016-12-27 | 2017-05-31 | 唐山市斯瑞尔化工有限公司 | The production method of graininess Iron(III) chloride hexahydrate |
| CN106745321B (en) * | 2016-12-27 | 2019-01-29 | 唐山市斯瑞尔化工有限公司 | The production method of graininess Iron(III) chloride hexahydrate |
| CN111153439A (en) * | 2020-01-14 | 2020-05-15 | 斯瑞尔环境科技股份有限公司 | Process for producing ferric chloride or polyferric chloride by continuous oxygen oxidation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160504 |
|
| WD01 | Invention patent application deemed withdrawn after publication |