CN102716616A - Filter aid used in leaf filtering process of sodium aluminate solution - Google Patents
Filter aid used in leaf filtering process of sodium aluminate solution Download PDFInfo
- Publication number
- CN102716616A CN102716616A CN2012102058756A CN201210205875A CN102716616A CN 102716616 A CN102716616 A CN 102716616A CN 2012102058756 A CN2012102058756 A CN 2012102058756A CN 201210205875 A CN201210205875 A CN 201210205875A CN 102716616 A CN102716616 A CN 102716616A
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- Prior art keywords
- filter aid
- sodium aluminate
- aluminate solution
- filter
- leaf
- 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.)
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a filter aid used in a leaf filtering process of a sodium aluminate solution, and relates to a method for increasing the leaf filtering productivity by adopting the filter aid in an alumina production process using a Bayer method. The filter aid is characterized in that the filter aid is fly ash. By adopting the filter air and an adding technology thereof, the productivity of the leaf filtering process of the sodium aluminate solution can be increased by one to twenty times on the premise that the production and operation cost is not increased, and the filter aid enters a red mud washing flow to be discharged outwards along with a leaf filtering cake, so that the alumina production process cannot be negatively influenced.
Description
Technical field
A kind of filter aid that is used for sodium aluminate solution leaf filtration journey relates to a kind of method that in the Bayer process aluminum oxide production process, adopts filter aid to improve leaf filter production capacity.
Background technology
In the at present domestic and international Bayer process alumina producing, the leaf filter subtractive process of sodium aluminate solution adopts milk of lime as filter aid usually, improves the leaf filter production capacity.But adopt milk of lime to do filter aid, calcium meeting in the milk of lime and the aluminium in the sodium aluminate solution react and generate the calcium calcium aluminosilicate hydrate usually, cause alumina loss.When working condition fluctuateed, the production capacity of leaf filter operation also often restricted the production capacity of whole alumina producer simultaneously.
Summary of the invention
The object of the invention is exactly the deficiency that exists to above-mentioned prior art, provides a kind of sodium aluminate solution leaf that can effectively improve to filter the journey production capacity, aluminum oxide production process is not caused the filter aid that the sodium aluminate solution leaf filters journey that is used for of any negative effect.
The objective of the invention is to realize through following technical scheme.
A kind of filter aid that is used for sodium aluminate solution leaf filtration journey is characterized in that this filter aid is a flyash.
A kind of filter aid that the sodium aluminate solution leaf filters journey that is used for of the present invention is characterized in that described flyash is for receiving the coal ash of catching the flue gas behind coal combustion.
A kind of filter aid that the sodium aluminate solution leaf filters journey that is used for of the present invention is characterized in that described fineness of pulverized-coal ash is that 4900 hole sizers tail over 10%～20%, and unit weight is 700～1000kg/m
3
A kind of filter aid that the sodium aluminate solution leaf filters journey that is used for of the present invention, the addition that it is characterized in that described filter aid flyash is 0.5 ~ 2g-
Filter aid/ g-
Floating material
A kind of filter aid that the sodium aluminate solution leaf filters journey that is used for of the present invention, filter aid can directly add in the thick liquid of Bayer process with powdered, perhaps allocates the back with every gram filter aid with 10ml left and right sides water and adds in the thick liquid of Bayer process.
A kind of filter aid that the sodium aluminate solution leaf filters journey that is used for of the present invention is characterized in that described filter aid flyash adds after the thick liquid of Bayer process mixes, and carries out the leaf filter at 95 ~ 105 ℃.
A kind of filter aid that the sodium aluminate solution leaf filters journey that is used for of the present invention; With flyash as helping the filter additive; Under the prerequisite that does not increase the production run cost; Can improve 1 ~ 20 times of the production capacity that the sodium aluminate solution leaf filters journey, filter aid gets into the laterite washing flow process with leaf filter filter cake and effluxes, and aluminum oxide production process is not caused any negative effect.
The specific embodiment
A kind of filter aid that is used for sodium aluminate solution leaf filtration journey, this filter aid are the thin ash that produces after coal burns in boiler in the flue gas, i.e. flyash; Described fineness of pulverized-coal ash is that 4900 hole sizers tail over 10%～20%, and unit weight is 700～1000kg/m
3Be added to 0.5 ~ 2g-
Filter aid/ g-
Floating materialDescribed filter aid flyash carries out the leaf filter at 95 ~ 105 ℃ after adding the thick liquid mixing of Bayer process.
Embodiment 1
Getting flyash is filter aid, and thick liquid floating material 1.058 g/l of Bayer process are according to 1 g-
Filter aid/ g-
Floating materialAddition add the filter aid mixing with powdered, under the condition of 99 ℃ of thick liquid temps, carry out the leaf filter, its production capacity is compared as filter aid with adopting milk of lime, production capacity is from 2.67 m
3/ m
2H brings up to 59.52m
3/ m
2H.
Embodiment 2
Getting flyash is filter aid, and the thick liquid floating material of Bayer process 0.409g/l is according to 0.90 g-
Filter aid/ g-
Floating materialAddition, filter aid and water are added thick liquid mixing after according to the mixed of 1g:10ml, under the condition of 95 ℃ of thick liquid temps, carry out the leaf filter, its production capacity is compared as filter aid with adopting milk of lime, production capacity is from 4.58 m
3/ m
2H brings up to 56.60m
3/ m
2H.
Claims (5)
1. one kind is used for the filter aid that the sodium aluminate solution leaf filters journey, it is characterized in that this filter aid is a flyash.
2. a kind of filter aid that the sodium aluminate solution leaf filters journey that is used for according to claim 1 is characterized in that described flyash is for receiving the coal ash of catching the flue gas behind coal combustion.
3. a kind of filter aid that the sodium aluminate solution leaf filters journey that is used for according to claim 1 is characterized in that described fineness of pulverized-coal ash is that 4900 hole sizers tail over 10%～20%, and unit weight is 700～1000kg/m
3
4. a kind of filter aid that the sodium aluminate solution leaf filters journey that is used for according to claim 1 is characterized in that the 0.5 ~ 2g-that is added to of described filter aid flyash
Filter aid/ g-
Floating material
5. a kind of filter aid that the sodium aluminate solution leaf filters journey that is used for according to claim 1 is characterized in that described filter aid flyash adds after the thick liquid of Bayer process mixes, and carries out the leaf filter at 95 ~ 105 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102058756A CN102716616A (en) | 2012-06-21 | 2012-06-21 | Filter aid used in leaf filtering process of sodium aluminate solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102058756A CN102716616A (en) | 2012-06-21 | 2012-06-21 | Filter aid used in leaf filtering process of sodium aluminate solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102716616A true CN102716616A (en) | 2012-10-10 |
Family
ID=46942561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102058756A Pending CN102716616A (en) | 2012-06-21 | 2012-06-21 | Filter aid used in leaf filtering process of sodium aluminate solution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102716616A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102951666A (en) * | 2012-11-29 | 2013-03-06 | 中国铝业股份有限公司 | Crude-liquid filtering and refining method by Bayer process |
| CN102989411A (en) * | 2012-11-29 | 2013-03-27 | 中国铝业股份有限公司 | Filter aid for refining thick liquid by using Bayer process |
| CN103157437A (en) * | 2013-04-07 | 2013-06-19 | 中国铝业股份有限公司 | Filter aid and regeneration method thereof |
| CN106315644A (en) * | 2015-07-03 | 2017-01-11 | 北京华索科技股份有限公司 | Method and system for acquiring refined fluid in alumina production process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076427A (en) * | 1992-02-05 | 1993-09-22 | 皮奇尼铝公司 | The method of from Bayer round-robin sodium aluminate solution, removing sodium oxalate |
| CN101708859A (en) * | 2009-12-02 | 2010-05-19 | 贾启 | Process for Bayer process aluminum oxide production by replacing carbide slag with lime |
| CN102259904A (en) * | 2011-05-24 | 2011-11-30 | 潘光和 | Bayer process for producing alumina by using waste material in power plant instead of lime milk |
| CN102489244A (en) * | 2011-11-24 | 2012-06-13 | 中国铝业股份有限公司 | Filtering aid for filtering aluminate solution and using method thereof |
-
2012
- 2012-06-21 CN CN2012102058756A patent/CN102716616A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076427A (en) * | 1992-02-05 | 1993-09-22 | 皮奇尼铝公司 | The method of from Bayer round-robin sodium aluminate solution, removing sodium oxalate |
| CN101708859A (en) * | 2009-12-02 | 2010-05-19 | 贾启 | Process for Bayer process aluminum oxide production by replacing carbide slag with lime |
| CN102259904A (en) * | 2011-05-24 | 2011-11-30 | 潘光和 | Bayer process for producing alumina by using waste material in power plant instead of lime milk |
| CN102489244A (en) * | 2011-11-24 | 2012-06-13 | 中国铝业股份有限公司 | Filtering aid for filtering aluminate solution and using method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102951666A (en) * | 2012-11-29 | 2013-03-06 | 中国铝业股份有限公司 | Crude-liquid filtering and refining method by Bayer process |
| CN102989411A (en) * | 2012-11-29 | 2013-03-27 | 中国铝业股份有限公司 | Filter aid for refining thick liquid by using Bayer process |
| CN103157437A (en) * | 2013-04-07 | 2013-06-19 | 中国铝业股份有限公司 | Filter aid and regeneration method thereof |
| CN103157437B (en) * | 2013-04-07 | 2016-02-17 | 中国铝业股份有限公司 | A kind of filter aid and renovation process thereof |
| CN106315644A (en) * | 2015-07-03 | 2017-01-11 | 北京华索科技股份有限公司 | Method and system for acquiring refined fluid in alumina production process |
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Application publication date: 20121010 |