CN102489244A - Filtering aid for filtering aluminate solution and using method thereof - Google Patents
Filtering aid for filtering aluminate solution and using method thereof Download PDFInfo
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- CN102489244A CN102489244A CN2011103778567A CN201110377856A CN102489244A CN 102489244 A CN102489244 A CN 102489244A CN 2011103778567 A CN2011103778567 A CN 2011103778567A CN 201110377856 A CN201110377856 A CN 201110377856A CN 102489244 A CN102489244 A CN 102489244A
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- pulverized coal
- coal ash
- filtering
- filtering aid
- filter aid
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Abstract
A filtering aid for filtering an aluminate solution and a using method of the filtering aid relate to a method of using pulverized coal ash and pulverized coal ash residue to serve as the filtering aid. The filtering aid is characterized in that the filtering aid is pulverized coal ash and pulverized coal ash residue of thermal power plants. According to the method, the source of raw materials for the filtering aid is stable and reliable, the preparation method is simple, convenient and practical, and the used raw materials are industrial waste and are low in price and convenient to use. The pulverized coal ash and pulverized coal ash residue have adsorption and entrapment effects on solid impurities and particles suspended in liquid due to different particle sizes and porous characteristics, thereby the purpose of liquid and solid seperation is achieved. The pulverized coal ash and pulverized coal ash residue are used as the filtering aid so that the filtering aid does not cause the loss of an aluminum element in the leaf filtration process, also does not introduce other impurity elements to the leaf filtration process, can keep chemical compositions of an original solution in stability and constant to the maximum limit and is easy to popularize and apply in industry.
Description
Technical field
A kind of filter aid of aluminum filtration acid salt solution and method for using thereof relate to a kind of method of using flyash and powdered coal cinder as the filtered aluminate solution.
Background technology
Aluminium salt (aluminate) solution is to produce aluminium oxide and the most basic original solution of aluminium, and the purity of this solution directly has influence on the chemical purity and the product quality indicator of products therefrom.Therefore the leaf filter of floating material is the important step in the aluminum oxide production process in the thick liquid of aluminium salt (aluminate).Add filter aid utilize its screening and suction-operated with the solid impurity particulate trap that floats on a liquid in the surface and space of filter medium, thereby reach the purpose of Separation of Solid and Liquid.
In aluminum oxide production process; The general milk of lime that adopts is as filter aid; Because of it can improve thick liquid strainability and improve the Bayer semen quality, but there is following deficiency in this filtering method that helps: 1, cause the alumina loss in the sodium aluminate solution, and then influence production capacity; 2, increase the energy consumption of evaporation.
Summary of the invention
The object of the invention is exactly the deficiency that exists to above-mentioned prior art, provides a kind of and can effectively utilize industrial waste, the filter aid and the method for using thereof of the aluminum filtration acid salt solution that is easy in industry, use.
The objective of the invention is to be achieved through following technical scheme.
A kind of filter aid of aluminum filtration acid salt solution is characterized in that this filter aid is the flyash and the powdered coal cinder of steam power plant.
The filter aid of a kind of aluminum filtration acid salt solution of the present invention is characterized in that described filter aid for the flyash of steam power plant and powdered coal cinder, and its chemical composition is SiO
2Be 35% ~ 50%, Fe
2O
3Be 3% ~ 8%, Al
2O
3Be 20% ~ 30%, CaO
CloseBe 5% ~ 10%, granularity D50 is 5 ~ 50 μ m, and the ratio that is mixed is 0 ~ 2.
The method for using of the filter aid of a kind of aluminum filtration acid salt solution of the present invention; It is characterized in that use is that described filter aid is joined in the aluminate solution, addition is: 0.5 ~ 5g/l, under 80 ~ 120 ℃ of temperature; Stir after 20 ~ 60 minutes isolated by filtration.
The filter aid of a kind of aluminum filtration acid salt solution of the present invention; Adopt granularity and suitable flyash and the powdered coal cinder of chemical composition to mix the replace lime breast by a certain percentage as filter aid; Can make full use of industrial waste, reduce production costs, realize the purpose that environmental protection, joint prop up.Therefore, the research of this method and application have important social benefit, environmental benefit and economic benefit.Flyash and powdered coal cinder are the main solid slags that the coal-burning power plant discharges.Flyash has the bulk material of pozzolanic activity, mainly by mineral compositions such as glass microballoon, spongy vitreum, quartz, iron oxide, carbon granules, sulfate.The chemical property of powdered coal cinder is identical basically with flyash, and the particle of powdered coal cinder is big and corner angle are arranged than flyash.The physical and chemical performance of flyash and powdered coal cinder can satisfy the basic demand of filter aid: 1, can form the rigid particles of how empty cake layer, make filter cake that good penetration property and lower fluid resistance arranged; 2, has chemical stability; 3, in the operation pressure, has Incoercibility.The screening, suction-operated that utilize filter aid with the solid impurity particulate trap that floats on a liquid in the surface and space of filter medium, thereby reach the purpose of Separation of Solid and Liquid.
Method of the present invention has been improved weakness and the deficiency in the existing filter aid use, has promptly reduced leaf and has filtered alumina loss in the journey, has reduced the energy consumption of evaporation process again.This filter aid raw materials enjoy stable sources is reliable, and the preparation method is simple and easy to do, and what use is industrial waste, and is cheap, easy to use.Utilize the different grain size of flyash and powdered coal cinder and the characteristic of porous thereof, the solid impurity particulate that floats on a liquid is had the effect of adsorbing and holding back, thereby reach the purpose of liquid-solid separation.Use flyash and powdered coal cinder to filter the loss that neither can cause aluminium element in the journey at leaf, also can not introduce other impurity element, can keep the chemical composition of original solution to stablize constant to greatest extent as filter aid.The present invention is easy in industry, apply.
The specific embodiment
A kind of filter aid of aluminum filtration acid salt solution, this filter aid are the flyash and the powdered coal cinder of steam power plant, and its chemical composition is SiO
2Be about 35% ~ 50%, Fe
2O
3Be about 3% ~ 8%, Al
2O
3Be about 20% ~ 30%, CaO
CloseBe about 5% ~ 10%, granularity D50 is 5 ~ 50 μ m, and the ratio that is mixed is 0 ~ 2.Use is that described filter aid is joined in the aluminate solution, and addition is: 0.5 ~ 5g/l, under 80 ~ 120 ℃ of temperature, stir after 20 ~ 60 minutes isolated by filtration.
Embodiment 1
Thick liquid does not add filtered in the aluminum oxide production process, 2 liters of thick liquid rates of filtration 2 minutes and 43 seconds, seminal fluid floating material content 0.032g/l, SiO
2Content is 1.11 g/l, Fe
2O
3Amount is 0.014 g/l; Add flyash and powdered coal cinder in the thick liquid as filtered, 2 liters of thick liquid rates of filtration 2 minutes and 27 seconds, seminal fluid floating material content 0.020g/l, SiO
2Content is 1.14 g/l, Fe
2O
3Amount is 0.014 g/l.
Embodiment 2
Thick liquid adds milk of lime and helps filter in the aluminum oxide production process, 2 liters of thick liquid rates of filtration 2 minutes and 13 seconds, seminal fluid floating material content 0.029g/l, SiO
2Content is 1.06 g/l, Fe
2O
3Amount is 0.012 g/l; Add flyash in the thick liquid and powdered coal cinder helps filter, 2 liters of thick liquid rates of filtration 2 minutes and 27 seconds, seminal fluid floating material content 0.020g/l, SiO
2Content is 1.14 g/l, Fe
2O
3Amount is 0.014 g/l.
Embodiment 3
Thick liquid interpolation powdered coal cinder and flyash (adding proportion is respectively 0.3,0.5,0.7) help filter in the aluminum oxide production process,, this filter aid is the flyash and the powdered coal cinder of steam power plant, its chemical composition is SiO
2Be 45%, Fe
2O
3Be about 7%, Al
2O
3Be about 22%, CaO
CloseBe about 9%, granularity D50 is 12 μ m, and the ratio that is mixed is 0.3.2 liters of thick liquid rates of filtration were respectively 2 minutes 27 seconds, 2 minutes and 54 seconds, 3 minutes and 09 second, and seminal fluid floating material content is respectively 0.020g/l, 0.022g/l, 0.031g/l, SiO
2Content is respectively 1.14 g/l, 1.12 g/l, 1.17 g/l, Fe
2O
3Amount is respectively 0.014 g/l, 0.014 g/l, 0.013 g/l.
Embodiment 4
Thick liquid interpolation flyash helps filter in the aluminum oxide production process,, this filter aid is the flyash and the powdered coal cinder of steam power plant, its chemical composition is SiO
2Be about 35% ~ 50%, Fe
2O
3Be about 3% ~ 8%, Al
2O
3Be about 20% ~ 30%, CaO
CloseBe about 5% ~ 10%, granularity D50 is 5 ~ 20 μ m, and the ratio that is mixed is 0.3,0.5,0.7.2 liters of thick liquid rates of filtration were respectively 2 minutes 26 seconds, 2 minutes and 41 seconds, 2 minutes and 50 seconds, and seminal fluid floating material content is respectively 0.019g/l, 0.016g/l, 0.018g/l, SiO
2Content is respectively 1.07 g/l, 1.08 g/l, 1.09 g/l, Fe
2O
3Amount is respectively 0.014 g/l, 0.014 g/l, 0.016 g/l.
Claims (3)
1. the filter aid of an aluminum filtration acid salt solution is characterized in that this filter aid is the flyash and the powdered coal cinder of steam power plant.
2. the filter aid of a kind of aluminum filtration acid salt solution according to claim 1 is characterized in that described filter aid for the flyash of steam power plant and powdered coal cinder, and its chemical composition is SiO
2Be 35% ~ 50%, Fe
2O
3Be 3% ~ 8%, Al
2O
3Be 20% ~ 30%, CaO
CloseBe 5% ~ 10%, granularity D50 is 5 ~ 50 μ m, and the ratio that is mixed is 0 ~ 2.
3. according to the method for using of the filter aid of claim 1 and 2 described a kind of aluminum filtration acid salt solutions; It is characterized in that use is that described filter aid is joined in the aluminate solution, addition is: 0.5 ~ 5g/l, under 80 ~ 120 ℃ of temperature; Stir after 20 ~ 60 minutes isolated by filtration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103778567A CN102489244A (en) | 2011-11-24 | 2011-11-24 | Filtering aid for filtering aluminate solution and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103778567A CN102489244A (en) | 2011-11-24 | 2011-11-24 | Filtering aid for filtering aluminate solution and using method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102489244A true CN102489244A (en) | 2012-06-13 |
Family
ID=46181128
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| CN2011103778567A Pending CN102489244A (en) | 2011-11-24 | 2011-11-24 | Filtering aid for filtering aluminate solution and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102716616A (en) * | 2012-06-21 | 2012-10-10 | 中国铝业股份有限公司 | Filter aid used in leaf filtering process of sodium aluminate solution |
Citations (3)
| 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 |
| CN101186324A (en) * | 2007-12-17 | 2008-05-28 | 中国铝业股份有限公司 | Deep decomposition method for sodium aluminate solution |
| CN101708859A (en) * | 2009-12-02 | 2010-05-19 | 贾启 | Process for Bayer process aluminum oxide production by replacing carbide slag with lime |
-
2011
- 2011-11-24 CN CN2011103778567A patent/CN102489244A/en active Pending
Patent Citations (3)
| 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 |
| CN101186324A (en) * | 2007-12-17 | 2008-05-28 | 中国铝业股份有限公司 | Deep decomposition method for sodium aluminate solution |
| CN101708859A (en) * | 2009-12-02 | 2010-05-19 | 贾启 | Process for Bayer process aluminum oxide production by replacing carbide slag with lime |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102716616A (en) * | 2012-06-21 | 2012-10-10 | 中国铝业股份有限公司 | Filter aid used in leaf filtering process of sodium aluminate solution |
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Application publication date: 20120613 |