CN104249065A - Cleaning method of silicon material waste gas absorption tower - Google Patents
Cleaning method of silicon material waste gas absorption tower Download PDFInfo
- Publication number
- CN104249065A CN104249065A CN201310260525.4A CN201310260525A CN104249065A CN 104249065 A CN104249065 A CN 104249065A CN 201310260525 A CN201310260525 A CN 201310260525A CN 104249065 A CN104249065 A CN 104249065A
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- China
- Prior art keywords
- waste gas
- absorption tower
- gas absorption
- cleaning
- nitric acid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention provides a cleaning method of a silicon material waste gas absorption tower. The method comprises the following steps of draining alkaline absorbing liquid out of the waste gas absorption tower, and using water to circulate and flush the waste gas absorption tower for the first time; using 4.5wt% to 5.5wt% of nitric acid solution to circulate and clean the flushed waste gas absorption tower; using water to circulate and flush the waste gas absorption tower for the second time. The method has the advantages that the waste gas absorption tower is cleaned by the nitric acid solution with higher oxidizing property, and the capacity of dissolving and removing the impurities and dirt is greatly improved by the oxidability of nitric acid, so a filler in the waste gas absorption tower is completely cleaned, the utilization rate of the nitric acid is improved, the cleaning cycle is greatly prolonged, and the waste gas treatment and cleaning cost of the silicon material waste gas absorption tower is reduced.
Description
Technical field
The present invention relates to technical field of solar batteries, particularly relate to a kind of cleaning method of silicon material waste gas absorption tower.
Background technology
In photovoltaic industry silicon material production process, using virgin polycrystalline silicon or regeneration silicon material as raw material, in single crystal growing furnace, be drawn into monocrystal rod or polycrystalline cast ingot silicon material after fusing.Its purity requirement of silicon material of pulling monocrystal rod or polycrystalline cast ingot is higher, and silicon material can pollute on surface in processing, transport, storage process, therefore must clean its surface before use silicon raw material.
The general mix acid liquor of hydrofluoric acid and nitric acid that adopts cleans silicon material surface impurity at present, in cleaning process, the metal impurities on silicon material top layer and oxide and acid solution produce strong chemical reaction, temperatures as high about 60 DEG C, the silicon on top layer also can produce chemical reaction with acid solution simultaneously, produces the salt compounds such as prodan.Above-mentioned salt compounds carries out alkali liquor absorption process along with the gas of reaction generation and the gas of volatilization enter waste gas tower, the solid matters such as the prodan produced in absorption process, sodium metasilicate and vulcanized sodium slowly can deposit and be attached to filler, nozzle and inner-walls of duct, thus affect the assimilation effect of waste gas tower greatly, therefore need regularly to carry out cleaning treatment to waste gas tower.
Traditional handicraft is that the technical-grade hydrochloric acid of 37wt% is diluted to 6wt% by concentration, then by the hydrochloric acid after dilution at waste gas tower Inner eycle to reach the object removing impurity and dirt, but wash result shows, the effect of hydrochloric acid cleaning waste gas tower is poor, cleaning frequency is short, easily have nitrogen dioxide tobacco to blow out in cleaning process, the feature of environmental protection is poor simultaneously.
Summary of the invention
The technical problem that the present invention solves is the cleaning method providing a kind of silicon material waste gas absorption tower, and cleaning method cleaning performance of the present invention is better, and the cleaning frequency is long and the feature of environmental protection is better.
In view of this, the invention provides a kind of cleaning method of silicon material waste gas absorption tower, comprise the following steps:
The alkaline absorption solution of emptying waste gas absorption tower, then adopts water first time circulation flushing waste gas absorption tower;
Adopt the waste gas absorption tower after the above-mentioned flushing of salpeter solution wash cycles of 4.5wt% ~ 5.5wt%;
Adopt water second time circulation flushing waste gas absorption tower.
Preferably, described first time circulation flushing waste gas absorption tower step be specially:
Adopt water to rinse waste gas absorption tower 3 ~ 5 times, to waste gas absorption tower, the pH of liquid is 7 ~ 9.
Preferably, the step of described second time circulation flushing waste gas absorption tower is specially:
Adopt water second time to rinse waste gas absorption tower 3 ~ 5 times, to waste gas absorption tower, the pH of liquid is 6 ~ 7.
Preferably, described first time circulation flushing waste gas absorption tower step after also comprise:
By the emptying rate of liquid in the waste gas absorption tower after flushing.
Preferably, the time of described second time circulation flushing waste gas absorption tower is 1 ~ 2h.
Compared with prior art, the invention provides a kind of cleaning method of silicon material waste gas absorption tower, comprise the following steps: the alkaline absorption solution of first emptying waste gas absorption tower, and adopt water first time circulation flushing waste gas absorption tower, alkaline absorption solution in waste gas absorption tower is cleaned up, then adopts the waste gas absorption tower after the above-mentioned flushing of salpeter solution wash cycles of 4.5wt% ~ 5.5wt%; Finally adopt water second time circulation flushing waste gas absorption tower, by clean for the waste-liquid cleaning in waste gas absorption tower.Present invention employs the salpeter solution cleaning waste gas absorption tower that oxidisability is stronger, the oxidisability of nitric acid significantly enhances it and dissolves the ability removing impurity and dirt, makes the filler in waste gas absorption tower clean cleaner; Due to the dissolving removal effect that nitric acid is good, improve the utilization rate of nitric acid, the cleaning frequency is extended greatly, reduce silicon material waste gas absorption tower exhaust-gas treatment and cleaning cost; Simultaneously because nitric acid cleaning performance is complete, avoid the risk that chimney emits tobacco, make the cleaning process feature of environmental protection of waste gas absorption tower better.
Detailed description of the invention
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
In the process of pickling silicon material, the chemical reaction of silicon and mixed acid and the volatilization of acid mist cause waste gas tower packing and inner-walls of duct to adhere to the material of a large amount of indissoluble, the attachment of these impurity and dirt reduces the specific area of filler, thus have impact on the assimilation effect of waste gas absorption tower.
Thus, the embodiment of the invention discloses a kind of cleaning method of silicon material waste gas absorption tower, comprise the following steps:
The alkaline absorption solution of emptying waste gas absorption tower, then adopts water first time circulation flushing waste gas absorption tower;
Adopt the waste gas absorption tower after the above-mentioned flushing of salpeter solution wash cycles of 4.5wt% ~ 5.5wt%;
Adopt water second time circulation flushing waste gas absorption tower.
According to the present invention, needed before waste gas absorption tower is cleaned first by emptying for the alkaline absorption solution in waste gas absorption tower, and adopt water circulation to rinse waste gas absorption tower until the pH of liquid is 7 ~ 9 in waste gas absorption tower.If the absorbing liquid in waste gas absorption tower is not rinsed well, then, in the process of later stage cleaning waste gas absorption tower, the amount of the nitric acid of interpolation will increase, with in and alkaline absorption solution in waste gas absorption tower, thus cause the waste of cleaning fluid nitric acid.In order to make the alkaline absorption solution in waste gas absorption tower clean up, preferably, the present invention adopts water to rinse waste gas absorption tower 2 ~ 3 times, and rinse 2 ~ 3h, to waste gas absorption tower, the pH of liquid is 7 ~ 9.
After the alkaline absorption solution in waste gas absorption tower is cleaned up, by the emptying rate of liquid in waste gas absorption tower.The present invention preferably adds nitric acid in the circulating box of waste gas absorption tower, dissolves indissoluble material prodan, sodium metasilicate and the vulcanized sodium that filler and the inwall of waste gas absorption tower adhere to.In the present invention, the reaction principle of nitric acid and indissoluble material is:
（1）Na
2SiF
6+2HNO
3=2NaNO
3+H
2SiF
6；
（2）Na
2SiO
3+2HNO
3=H
2SiO
3+2NaNO
3；
（3）Na
2S+2HNO
3=2NaNO
3+H
2S。
The cleansing medium of waste gas absorption tower of the present invention is nitric acid, and described nitric acid is the inorganic acid of a kind of strong oxidizing property, severe corrosive.Though nitric acid and hydrochloric acid belong to strong acid, soluble in water, but nitric acid not only has the general character of strong acid, also has stronger oxidisability, and this oxidisability is stronger in dilute nitric acid solution, also significantly enhances the dissolving removal ability of this solution just because of this oxidisability.The concentration of described salpeter solution is 4.5wt% ~ 5.5wt%, is preferably 5wt%.In order to be cleaned up by the indissoluble material in waste gas absorption tower, the present invention adopts nitric acid to clean waste gas absorption tower circulation, and scavenging period is preferably 2 ~ 3h.
According to the present invention, the indissoluble material in waste gas absorption tower cleans waste gas absorption tower by water circulation, again with the impurity will washed down in waste gas absorption tower and dirt combustion gas absorption tower after adopting nitric acid cleaning.In order to ensure that impurity in waste gas absorption tower and dirt clean up completely, the time of described cleaning is preferably 2 ~ 3h, until the pH of liquid in waste gas absorption tower is 6 ~ 7.
The invention provides a kind of cleaning method of silicon material waste gas absorption tower, comprise the following steps: the alkaline absorption solution of first emptying waste gas absorption tower, and adopt water first time circulation flushing waste gas absorption tower, alkaline absorption solution in waste gas absorption tower is cleaned up, then adopts the waste gas absorption tower after the above-mentioned flushing of salpeter solution wash cycles of 4.5wt% ~ 5.5wt%; Finally adopt water second time circulation flushing waste gas absorption tower, by clean for the waste-liquid cleaning in waste gas absorption tower.Present invention employs the salpeter solution cleaning waste gas absorption tower that oxidisability is stronger, the oxidisability of nitric acid significantly enhances it and dissolves removal ability, makes the filler in waste gas absorption tower clean cleaner; Due to the dissolving removal effect that nitric acid is good, improve the utilization rate of nitric acid cleaning fluid, the cleaning frequency is extended greatly, reduce silicon material waste gas absorption tower exhaust-gas treatment and cleaning cost; Simultaneously because nitric acid cleaning performance is complete, avoid the risk that chimney emits tobacco, make the feature of environmental protection of waste gas absorption tower better.Experimental result shows, through pernitric acid cleaning waste gas absorption tower cleaning performance better and good stability, emerge without tobacco, winter, every cleaning in 30 days once summer cleaned once every 40 days.
In order to understand the present invention further, be described in detail below in conjunction with the cleaning method of embodiment to waste gas absorption tower provided by the invention, protection scope of the present invention is not limited by the following examples.
Embodiment 1
Open waste gas absorption tower atmospheric valve, by emptying for the absorbing liquid in waste gas absorption tower, in discarded absorption tower, add liquid level line under running water to circulating box, adopt tap water waste gas absorption tower 3 times, rinse 3h, until the pH of water is 7 ~ 9 in waste gas absorption tower;
Waste gas absorption tower is emptying by flushing water after washing, then adds to the circulating box of waste gas absorption tower the lower liquid level line of dust technology to circulating box that concentration is 5wt%, cleaning waste gas absorption tower 3 ~ 4h;
By emptying for the waste liquid of pickling in waste gas absorption tower, liquid level line under interpolation running water to circulating box, ON cycle pump cleaning waste gas absorption tower 1 ~ 2h, until the pH detecting liquid in waste gas absorption tower is 6 ~ 7.
After being adopted by waste gas absorption tower nitric acid to clean, observe the filler in waste gas absorption tower, the cleaning performance of filler is better, emerges in cleaning process without tobacco.Experimental result shows, adopts nitric acid cleaning waste gas absorption tower, and once, cleaning in 40 days summers once in cleaning in 30 days winters.
Comparative example 1
Open waste gas absorption tower atmospheric valve, by emptying for the absorbing liquid in waste gas absorption tower, in discarded absorption tower, add liquid level line under running water to circulating box, adopt tap water waste gas absorption tower 3 times, rinse 3h, until the pH of water is 7 ~ 9 in waste gas absorption tower;
Waste gas absorption tower is emptying by flushing water after washing, then adds to the circulating box of waste gas absorption tower the lower liquid level line of hydrochloric acid to circulating box that concentration is 6wt%, cleaning waste gas absorption tower 3 ~ 4h;
By emptying for the waste liquid of pickling in waste gas absorption tower, liquid level line under interpolation running water to circulating box, ON cycle pump cleaning waste gas absorption tower 1 ~ 2h, until the pH detecting liquid in waste gas absorption tower is 6 ~ 7.
After waste gas absorption tower is adopted hydrochloric acid cleaning, observe the filler in waste gas absorption tower, the cleaning performance of filler is poor, and regular in cleaning process have tobacco to emerge.Experimental result shows, adopts hydrochloric acid cleaning waste gas absorption tower, and once, cleaning in 25 days summers once in cleaning in 15 days winters.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a cleaning method for silicon material waste gas absorption tower, comprises the following steps:
The alkaline absorption solution of emptying waste gas absorption tower, then adopts water first time circulation flushing waste gas absorption tower;
Adopt the waste gas absorption tower after the above-mentioned flushing of salpeter solution wash cycles of 4.5wt% ~ 5.5wt%;
Adopt water second time circulation flushing waste gas absorption tower.
2. cleaning method according to claim 1, is characterized in that, described first time the step of circulation flushing waste gas absorption tower be specially:
Adopt water to rinse waste gas absorption tower 3 ~ 5 times, to waste gas absorption tower, the pH of liquid is 7 ~ 9.
3. cleaning method according to claim 1, is characterized in that, the step of described second time circulation flushing waste gas absorption tower is specially:
Adopt water second time to rinse waste gas absorption tower 3 ~ 5 times, to waste gas absorption tower, the pH of liquid is 6 ~ 7.
4. cleaning method according to claim 1, is characterized in that, described first time circulation flushing waste gas absorption tower step after also comprise:
By the emptying rate of liquid in the waste gas absorption tower after flushing.
5. cleaning method according to claim 1, is characterized in that, the time of described second time circulation flushing waste gas absorption tower is 1 ~ 2h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310260525.4A CN104249065B (en) | 2013-06-26 | 2013-06-26 | A kind of cleaning method of silicon material waste gas absorption tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310260525.4A CN104249065B (en) | 2013-06-26 | 2013-06-26 | A kind of cleaning method of silicon material waste gas absorption tower |
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| Publication Number | Publication Date |
|---|---|
| CN104249065A true CN104249065A (en) | 2014-12-31 |
| CN104249065B CN104249065B (en) | 2016-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310260525.4A Expired - Fee Related CN104249065B (en) | 2013-06-26 | 2013-06-26 | A kind of cleaning method of silicon material waste gas absorption tower |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105013754A (en) * | 2015-06-24 | 2015-11-04 | 山东华光光电子有限公司 | Online chemical cleaning method for exhaust treatment system of MOCVD device |
| CN105695161A (en) * | 2016-03-16 | 2016-06-22 | 安徽海德石油化工有限公司 | Filling material cleaning agent for waste gas absorption tower of oil refinery |
Citations (6)
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| JPS59215381A (en) * | 1983-05-24 | 1984-12-05 | Agency Of Ind Science & Technol | Solar pond in gel |
| CN85107864A (en) * | 1985-10-25 | 1987-05-06 | 王澍营 | The Pollution abatement of sulfur-containing wasting alkali and utilization |
| CN1947869A (en) * | 2006-05-12 | 2007-04-18 | 浙江昱辉阳光能源有限公司 | Method for cleaning silicon material |
| CN101406887A (en) * | 2007-10-12 | 2009-04-15 | 广州泰成生化科技有限公司 | In situ cleaning method |
| WO2009108286A1 (en) * | 2008-02-28 | 2009-09-03 | Corning Incorporated | Electrochemical methods of making nanostructures |
| US20120219797A1 (en) * | 2009-08-06 | 2012-08-30 | Mitsui Mining & Smelting Co., Ltd. | Semiconductor Powder and Method for Producing the Same |
-
2013
- 2013-06-26 CN CN201310260525.4A patent/CN104249065B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59215381A (en) * | 1983-05-24 | 1984-12-05 | Agency Of Ind Science & Technol | Solar pond in gel |
| CN85107864A (en) * | 1985-10-25 | 1987-05-06 | 王澍营 | The Pollution abatement of sulfur-containing wasting alkali and utilization |
| CN1947869A (en) * | 2006-05-12 | 2007-04-18 | 浙江昱辉阳光能源有限公司 | Method for cleaning silicon material |
| CN101406887A (en) * | 2007-10-12 | 2009-04-15 | 广州泰成生化科技有限公司 | In situ cleaning method |
| WO2009108286A1 (en) * | 2008-02-28 | 2009-09-03 | Corning Incorporated | Electrochemical methods of making nanostructures |
| US20120219797A1 (en) * | 2009-08-06 | 2012-08-30 | Mitsui Mining & Smelting Co., Ltd. | Semiconductor Powder and Method for Producing the Same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105013754A (en) * | 2015-06-24 | 2015-11-04 | 山东华光光电子有限公司 | Online chemical cleaning method for exhaust treatment system of MOCVD device |
| CN105695161A (en) * | 2016-03-16 | 2016-06-22 | 安徽海德石油化工有限公司 | Filling material cleaning agent for waste gas absorption tower of oil refinery |
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| Publication number | Publication date |
|---|---|
| CN104249065B (en) | 2016-12-28 |
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Granted publication date: 20161228 Termination date: 20210626 |