CN101580943A - Method for clearing pipelines in manufacturing process of aluminium oxide - Google Patents
Method for clearing pipelines in manufacturing process of aluminium oxide Download PDFInfo
- Publication number
- CN101580943A CN101580943A CNA2009100860562A CN200910086056A CN101580943A CN 101580943 A CN101580943 A CN 101580943A CN A2009100860562 A CNA2009100860562 A CN A2009100860562A CN 200910086056 A CN200910086056 A CN 200910086056A CN 101580943 A CN101580943 A CN 101580943A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- alkali lye
- cleaning
- pipelines
- clearing
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title abstract description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 172
- 239000003513 alkali Substances 0.000 claims abstract description 63
- 238000004140 cleaning Methods 0.000 claims description 31
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 16
- 206010039509 Scab Diseases 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 3
- 231100000241 scar Toxicity 0.000 abstract 6
- 208000032544 Cicatrix Diseases 0.000 abstract 5
- 230000037387 scars Effects 0.000 abstract 5
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 230000003628 erosive effect Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 64
- 210000000582 semen Anatomy 0.000 description 23
- 230000000694 effects Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000003381 solubilizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention provides a method for clearing pipelines in the manufacturing process of aluminium oxide, which is applicable to the clearance of scars generated in the pipeline transportation section in the manufacturing process of aluminium oxide, in particular to the method for clearing the scars inside the pipelines. The clearing process is characterized in that the pipeline is full of floating NaOH alkali liquor with the temperature of 93-103 DEG C in the clearing process; the NaOH alkali liquor dissolves the scars in the pipelines and the scars can be cleared by the floating and eroding of the alkali liquor. The wet clearing method of pipelines in the process of manufacturing the aluminium oxide by the sintering method can realize scar decomposition and return to the flow by utilizing the principle that alkali solution with certain temperature, concentration and flow rate can dissolve the scars, thus realizing the recycling of the pipelines for transmitting materials in the manufacturing process of the aluminium oxide and improving production capability and device productivity.
Description
Technical field
The method for cleaning of pipeline in a kind of aluminum oxide production process is applicable to that alumina production pipeline delivery section branch produces the cleaning that scabs, especially the method for cleaning that scabs at pipe interior.
Background technology
One of maximum production bottleneck is exactly the scabbing of pipeline in the wet production process in the alumina producing, and the composition that scabs mostly is Na
2O, Al
2O
3, SiO
2And crystal water, cause pipeline transmission capacity to descend owing to scab, equipment capacity reduces.Almost all adopt labor cleaning's method at pipeline cleaning in the past, not only security is difficult to guarantee, because clearance activity causes the fluctuation of production, has reduced the equipment operation ratio simultaneously, causes the material waste, has increased production cost, and surrounding enviroment are damaged.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists at above-mentioned prior art, provides a kind of and can effectively improve pipeline transmission capacity, improves equipment capacity, improves utilization of materials, the method for cleaning of pipeline in the aluminum oxide production process simple to operate.
The objective of the invention is to be achieved through the following technical solutions.
The method for cleaning of pipeline in a kind of aluminum oxide production process is characterized in that scale removal process is that to be full of mobile, temperature in pipeline be 93-103 ℃ NaOH alkali lye, with the dissolving that scabs in the pipeline, and is subjected to mobile the washing away of alkali lye and removes.
The method for cleaning of pipeline in a kind of aluminum oxide production process of the present invention is characterized in that described NaOH concentration of lye is 155-170g/L.
The method for cleaning of pipeline in a kind of aluminum oxide production process of the present invention, the velocity of flow that it is characterized in that described NaOH alkali lye is 1-3m/s.
The method for cleaning of pipeline in a kind of aluminum oxide production process of the present invention, it is characterized in that described scale removal process is pipeline for clearance to be inserted a piping system that has alkali lye storage tanks, recycle pump and adapting pipe form the closed loop, make alkali lye in pipeline, carry out wash cycles.
The method for cleaning of pipeline in a kind of aluminum oxide production process of the present invention is characterized in that described alkali lye heats in the alkali lye storage tanks.
The method for cleaning of pipeline in a kind of aluminum oxide production process of the present invention is characterized in that the alkali lye height in the described alkali lye storage tanks is 2m-4m.
Method of the present invention, its seminal fluid pipe wet blasting is the reversed reaction of alumina producing desilication reaction.
Na
2O·Al
2O
3·1.7SiO
3·nH
2O+NaOH←→NaAl(OH)
4+Na
2SiO
3
3CaO·Al
2O
3·xSiO
2·(6-2x)H
2O↓+2xNaOH+aq←→3CaO·Al
2O
3·6H
2O+xNa
2SiO
3+aq
Adopt method of the present invention, carry out fast in order to ensure reaction, need alkali lye that certain temperature is arranged, increasing heater mode by lye vat realizes, the carrying out of solubilizing reaction must guarantee certain concentration of lye, and reaction is carried out to the dissolved direction, wants to realize that the pipeline cleaning effect also needs to possess certain flow, avoid pipeline and owing to can not be full of alkali lye cleaning effect is given a discount, the lye vat liquid storage will reach the height of 2m-4m usually.Keep certain groove to deposit and make the precondition that realizes flow.
From the top flow process as can be seen: utilize the take away pump that isolates as the alkali lye circulation power, and the pipeline and an other pipeline that will need to clear up form closed flow process, by take away pump alkali lye is transported to outlet conduit, is recycled to 1 lye vat by an other pipeline then and forms circulation.Make well heater in the lye vat, be used to guarantee alkali liquid temperature.
Method of the present invention, the circulation by week age just can realize the clean-up task to pipeline.Composition mostly is Na owing to scab
2O, Al
2O
3, SiO
2, crystal water, utilize the pyritous kind to divide the solvency action principle of mother liquid evaporation, by closed pipeline circulation heating to scabbing, keep certain flow velocity and temperature, by the circulation of for some time, thereby scabbing in the pipeline cleaned up, realize the regeneration of seminal fluid pipe.
Embodiment
The method for cleaning of pipeline in a kind of aluminum oxide production process, scale removal process are full of mobile, temperature in pipeline be that 93-103 ℃, concentration are the NaOH alkali lye of 155-170g/L, with the dissolving that scabs in the pipeline, and is subjected to mobile the washing away of alkali lye and removes; The velocity of flow of NaOH alkali lye is 1-3m/s.
During operation, pipeline for clearance is inserted a piping system that has alkali lye storage tanks, recycle pump and adapting pipe form the closed loop, the height of alkali lye is 2m-4m, and the heating back is circulated to scab in circulation loop and cleans out in the alkali lye storage tanks, generally needs 5-10 days.
Embodiment 1
The cleaning of seminal fluid pipeline in the alumina producing utilizes leaf filter to boil car alkali lye storage tank, the seminal fluid pump, and two feeding seminal fluid pipe connection form closed cycle.Alkali lye adopts seed precipitation solution and liquid caustic soda mixed preparing in the lye vat, and alkali lye Nk concentration is controlled at 155g/L.Circulation alkali liquor in the lye vat adopts steam-heated mode, makes its temperature remain on 103 ℃.The seminal fluid pump is driven, and after the alkali lye normal circulation, it highly is 2.0 meters that lye vat is deposited, and to keep recycle pump enough lifts is arranged, and making the flow velocity of seminal fluid pipeline internal recycle alkali lye is 1.0m/s.Along with the time lengthening of circulation alkali liquor, the concentration of timely sampling analysis alkali lye, regular replenishment alkali lye, the Nk concentration that keeps circulation alkali liquor is greater than 155g/L.Through 5 days operation, finish the cleaning of seminal fluid pipeline.Process is checked the segmentation of seminal fluid pipe, the full scale clearance that scabs in the pipeline, and cleaning effect reaches requirement.
Embodiment 2
The cleaning of seminal fluid pipeline in the alumina producing utilizes leaf filter to boil car alkali lye storage tank, the seminal fluid pump, and two feeding seminal fluid pipe connection form closed cycle.Alkali lye adopts seed precipitation solution and liquid caustic soda mixed preparing in the lye vat, and alkali lye Nk concentration is controlled at 170g/L.Circulation alkali liquor in the lye vat adopts steam-heated mode, makes its temperature remain on 93 ℃.The seminal fluid pump is driven, and after the alkali lye normal circulation, it highly is 4.0 meters that lye vat is deposited, and to keep recycle pump enough lifts is arranged, and making the flow velocity of seminal fluid pipeline internal recycle alkali lye is 3m/s.Along with the time lengthening of circulation alkali liquor, the concentration of timely sampling analysis alkali lye, regular replenishment alkali lye, the Nk concentration that keeps circulation alkali liquor is greater than 155g/L.Through 5 days operation, finish the cleaning of seminal fluid pipeline.Process is checked the segmentation of seminal fluid pipe, the full scale clearance that scabs in the pipeline, and cleaning effect reaches requirement.
Embodiment 3
The cleaning of seminal fluid pipeline in the alumina producing utilizes leaf filter to boil car alkali lye storage tank, the seminal fluid pump, and two feeding seminal fluid pipe connection form closed cycle.Alkali lye adopts seed precipitation solution and liquid caustic soda mixed preparing in the lye vat, and alkali lye Nk concentration is controlled at 160g/L.Circulation alkali liquor in the lye vat adopts steam-heated mode, makes its temperature remain on 100 ℃.The seminal fluid pump is driven, and after the alkali lye normal circulation, it highly is 3.0 meters that lye vat is deposited, and to keep recycle pump enough lifts is arranged, and making the flow velocity of seminal fluid pipeline internal recycle alkali lye is 2m/s.Along with the time lengthening of circulation alkali liquor, the concentration of timely sampling analysis alkali lye, regular replenishment alkali lye, the Nk concentration that keeps circulation alkali liquor is greater than 155g/L.Through 5 days operation, finish the cleaning of seminal fluid pipeline.Process is checked the segmentation of seminal fluid pipe, the full scale clearance that scabs in the pipeline, and cleaning effect reaches requirement.
Claims (6)
1. the method for cleaning of pipeline in the aluminum oxide production process is characterized in that scale removal process is that to be full of mobile, temperature in pipeline be 93-103 ℃ NaOH alkali lye, with the dissolving that scabs in the pipeline, and is subjected to mobile the washing away of alkali lye and removes.
2. the method for cleaning of pipeline in a kind of aluminum oxide production process according to claim 1 is characterized in that described NaOH concentration of lye is 155-170g/L.
3. the method for cleaning of pipeline in a kind of aluminum oxide production process according to claim 1, the velocity of flow that it is characterized in that described NaOH alkali lye is 1-3m/s.
4. the method for cleaning of pipeline in a kind of aluminum oxide production process according to claim 1, it is characterized in that described scale removal process is pipeline for clearance to be inserted a piping system that has alkali lye storage tanks, recycle pump and adapting pipe form the closed loop, make alkali lye in pipeline, carry out wash cycles.
5. the method for cleaning of pipeline in a kind of aluminum oxide production process according to claim 1 is characterized in that described alkali lye heats in the alkali lye storage tanks.
6. the method for cleaning of pipeline in a kind of aluminum oxide production process according to claim 1 is characterized in that the alkali lye height in the described alkali lye storage tanks is 2m-4m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100860562A CN101580943A (en) | 2009-06-01 | 2009-06-01 | Method for clearing pipelines in manufacturing process of aluminium oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100860562A CN101580943A (en) | 2009-06-01 | 2009-06-01 | Method for clearing pipelines in manufacturing process of aluminium oxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101580943A true CN101580943A (en) | 2009-11-18 |
Family
ID=41363253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100860562A Pending CN101580943A (en) | 2009-06-01 | 2009-06-01 | Method for clearing pipelines in manufacturing process of aluminium oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101580943A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871106A (en) * | 2010-06-13 | 2010-10-27 | 中国铝业股份有限公司 | Method for cleaning high-pressure digestion monotube |
| CN102553864A (en) * | 2010-12-29 | 2012-07-11 | 中国铝业股份有限公司 | Method for cleaning scab of high pressure dissolution system through water dissolution method |
| CN102826578A (en) * | 2012-09-06 | 2012-12-19 | 中国铝业股份有限公司 | Scale treatment method for decomposer |
| CN105271325A (en) * | 2014-06-27 | 2016-01-27 | 沈阳铝镁设计研究院有限公司 | Method for heating alkali liquor in alkali liquor tank for alkali wash in aluminum oxide plant |
| CN105737619A (en) * | 2014-12-12 | 2016-07-06 | 沈阳铝镁设计研究院有限公司 | Online cleaning method for scars of direct heat exchanger for flue gas waste heat utilization of aluminum oxide roasting furnace |
-
2009
- 2009-06-01 CN CNA2009100860562A patent/CN101580943A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871106A (en) * | 2010-06-13 | 2010-10-27 | 中国铝业股份有限公司 | Method for cleaning high-pressure digestion monotube |
| CN102553864A (en) * | 2010-12-29 | 2012-07-11 | 中国铝业股份有限公司 | Method for cleaning scab of high pressure dissolution system through water dissolution method |
| CN102826578A (en) * | 2012-09-06 | 2012-12-19 | 中国铝业股份有限公司 | Scale treatment method for decomposer |
| CN102826578B (en) * | 2012-09-06 | 2015-06-10 | 中国铝业股份有限公司 | Scale treatment method for decomposer |
| CN105271325A (en) * | 2014-06-27 | 2016-01-27 | 沈阳铝镁设计研究院有限公司 | Method for heating alkali liquor in alkali liquor tank for alkali wash in aluminum oxide plant |
| CN105271325B (en) * | 2014-06-27 | 2017-05-24 | 沈阳铝镁设计研究院有限公司 | Method for heating alkali liquor in alkali liquor tank for alkali wash in aluminum oxide plant |
| CN105737619A (en) * | 2014-12-12 | 2016-07-06 | 沈阳铝镁设计研究院有限公司 | Online cleaning method for scars of direct heat exchanger for flue gas waste heat utilization of aluminum oxide roasting furnace |
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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 | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20091118 |