CN101537306A - Aluminum die-casting waste gas treatment technology - Google Patents
Aluminum die-casting waste gas treatment technology Download PDFInfo
- Publication number
- CN101537306A CN101537306A CN200910038574A CN200910038574A CN101537306A CN 101537306 A CN101537306 A CN 101537306A CN 200910038574 A CN200910038574 A CN 200910038574A CN 200910038574 A CN200910038574 A CN 200910038574A CN 101537306 A CN101537306 A CN 101537306A
- Authority
- CN
- China
- Prior art keywords
- waste gas
- gas treatment
- treatment technology
- aluminum die
- casting
- 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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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/30—Capture or disposal of greenhouse gases of perfluorocarbons [PFC], hydrofluorocarbons [HFC] or sulfur hexafluoride [SF6]
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of waste gas treatment technology, in particular to an aluminum die-casting waste gas treatment technology which adopts HF in Ca(OH)2 and waste gas treatment. Obtained calcium fluoride is insoluble in H2O to be precipitated so as to separate and purify fluorides F<-> in waste gas and prevent the waste gas from reacting with H<+> to generate hydrofluoric acid. The aluminum die-casting waste gas treatment technology can purify the HF in the waste gas to avoid forming the hydrofluoric acid in a water bath or steam, achieves neutralization treatment and lessens the pollution.
Description
Technical field:
The present invention relates to the technical field of exhaust-gas treatment, especially a kind of aluminum die-casting waste gas treatment technology.
Background technology:
Aluminium matter is smelted and die casting waste gas, and be common in aluminium and smelt and golf caput production process, be a kind of high-temperature acidic gas, corrosivity is stronger.Be commonly considered as aluminic acid (HAlO
2) influence, thereby custom NaOH neutralisation treatment:
HAlO
2+NaOH→NaAlO
2+H
2O
But above-mentioned processing is difficult to qualified discharge.Through practice in nearly 2 years and analysis and research, know the acid factor of its waste gas, not to be decided by aluminic acid (HAlO
2), but since the HF steam in the waste gas, i.e. the influence of hydrofluoric acid.
The source of HF, the one, since the smelting and the die casting of aluminum metal, ice crystal (hexafluoro sodium aluminate Na commonly used
3AlF
6) make cosolvent and anti-wear additive, fluorine ion [F is arranged
-] exist; Be because aluminum metal and alkali effect have hydrogen to produce again, add the aluminic acid relation, hydrogen ion [H is arranged
+] exist.Two kinds of ionic interactions generate hydrogen fluoride gas, form hydrofluoric acid in the aqueous solution or steam:
[H
+]+[F
-]→HF
As follows with the NaOH processing reaction:
HF+NaOH→NaF+H
2O
Because NaF can be dissolved in H
2O, consequently [F
-] still exist, again can with [H
+] reaction generation hydrofluoric acid:
[H
+]+[F
-]→HF
Thereby the waste gas that existing scheme is handled can not reach the acid factor in the purifying exhaust air effectively, also just can not qualified discharge.
Summary of the invention:
The object of the present invention is to provide a kind of technology simple, effectively purify aluminum die-casting waste gas, make it the waste gas treatment process of qualified discharge.
The present invention is directed to the HF steam in the waste gas, adopt Ca (OH)
2Handle the HF in the waste gas, react as follows:
2HF+Ca(OH)
2→CaF
2↓+2H
2O
Because calcirm-fluoride is insoluble to H
2So O is can be with the fluorine ion [F in the waste gas
-] isolation of purified, thereby avoid forming hydrofluoric acid in the aqueous solution or the steam, reach neutralisation treatment, reduce and pollute.
The specific embodiment:
The present invention adopts Ca (OH)
2Handle the HF in the waste gas, react as follows:
2HF+Ca(OH)
2→CaF
2↓+2H
2O
Calcirm-fluoride is insoluble to H
2O is precipitated and is disengaged, thus the fluorine ion [F just in the waste gas
-] isolation of purified, stop itself and [H
+] reaction generation hydrofluoric acid, get final product the HF in the purifying exhaust air like this.
Among the present invention, for the aluminic acid (HAlO in the waste gas
2), then can adopt the NaOH neutralisation treatment:
HAlO
2+NaOH→Na
2AlO
2+H
2O
Also promptly, adopt Ca (OH)
2With the NaOH neutralisation treatment, reach the waste gas that thorough purification aluminium matter is smelted and die casting is produced, remove aluminic acid and hydrofluoric acid in the waste gas, make it qualified discharge, reduce and pollute.
Claims (1)
1, a kind of aluminum die-casting waste gas treatment technology is characterized in that: this process using Ca (OH)
2HF in the neutralisation treatment waste gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910038574A CN101537306A (en) | 2009-04-10 | 2009-04-10 | Aluminum die-casting waste gas treatment technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910038574A CN101537306A (en) | 2009-04-10 | 2009-04-10 | Aluminum die-casting waste gas treatment technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101537306A true CN101537306A (en) | 2009-09-23 |
Family
ID=41120829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910038574A Pending CN101537306A (en) | 2009-04-10 | 2009-04-10 | Aluminum die-casting waste gas treatment technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101537306A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102294170A (en) * | 2011-06-29 | 2011-12-28 | 宝纳资源控股(集团)有限公司 | Titanium high temperature electrolytic furnace special-purpose tail gas processing system |
| CN104740985A (en) * | 2013-12-26 | 2015-07-01 | 新地能源工程技术有限公司 | Fluorine-containing exhaust gas treatment device and method |
-
2009
- 2009-04-10 CN CN200910038574A patent/CN101537306A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102294170A (en) * | 2011-06-29 | 2011-12-28 | 宝纳资源控股(集团)有限公司 | Titanium high temperature electrolytic furnace special-purpose tail gas processing system |
| CN102294170B (en) * | 2011-06-29 | 2013-04-17 | 宝纳资源控股(集团)有限公司 | Titanium high temperature electrolytic furnace special-purpose tail gas processing system |
| CN104740985A (en) * | 2013-12-26 | 2015-07-01 | 新地能源工程技术有限公司 | Fluorine-containing exhaust gas treatment device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yuan Muchun Inventor before: Jian Feng Inventor before: Liu Xin Inventor before: Yuan Muchun |
|
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20090923 |