CN103449485A - Method for continuously producing pseudoboehmite by using ejector - Google Patents
Method for continuously producing pseudoboehmite by using ejector Download PDFInfo
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- CN103449485A CN103449485A CN2013103738751A CN201310373875A CN103449485A CN 103449485 A CN103449485 A CN 103449485A CN 2013103738751 A CN2013103738751 A CN 2013103738751A CN 201310373875 A CN201310373875 A CN 201310373875A CN 103449485 A CN103449485 A CN 103449485A
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- ejector
- boehmite
- pseudo
- sodium aluminate
- aluminate solution
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Abstract
The invention discloses a method for continuously producing pseudoboehmite by using an ejector, belonging to the technical field of boehmite preparation. The method comprises the following steps: continuously adding a sodium metaaluminate solution into the ejector, and introducing an air-carbon dioxide gas mixture into the ejector, and forming a strong liquid flow of the sodium metaaluminate solution to be thoroughly mixed with the carbon dioxide gas; controlling the flow rates of the gas mixture and the sodium metaaluminate solution to control the temperature of the slurry generated by reaction at 25-55 DEG C and the pH value at 9.5-11; and aging the slurry, filtering, washing with water to a neutral state, and drying to obtain the pseudoboehmite. The pseudoboehmite prepared by the method has the characteristics of large specific area and pore volume, reasonable peptization, continuous production, simple technique, high production efficiency, stable product quality, low equipment investment, low energy consumption, low labor intensity and the like, is reliable in operation, is convenient to operate and maintain, and is especially suitable for producing common pseudoboehmite, superfine aluminum hydroxide or aluminum oxide.
Description
Technical field
The present invention relates to aluminium standby technical field, particularly a kind of method of utilizing ejector to produce continuously pseudo-boehmite made of stones.
Background technology
Pseudo-boehmite claims again monohydrate alumina, false boehmite, nontoxic, tasteless, odorless, white colloidal (wet product) or powder (dry product), crystalline phase purity is high, peptization performance good, and cohesiveness is strong, have the characteristics such as specific surface is high, pore volume is large, it is thixotropy gel containing aquosity.
The production method of pseudo-boehmite has multiple: the current external normal aluminium alcoholates method that adopts, and the high and pore structure of quality product is easy to control, but production cost is high, has environmental pollution; At present domestic most economical, most widely used be acid system or alkaline process.The production method of industrial pseudo-boehmite mainly comprises following three kinds:
(1) neutralization of aluminium salt and alkali:
AlCl
3+3NH
3OH——>Al(OH)
3+3NH
4Cl
(2) the replacement(metathesis)reaction method of aluminium salt and sodium metaaluminate:
Al
2(SO
4)
3+6NaAlO
2＋12H
2O——>8Al(OH)
3＋3Na
2SO
4
(3) sodium metaaluminate and sour neutralization, as carborization:
2NaAlO
2＋CO
2＋3H
2O——>2Al(OH)
3＋Na
2CO
3
Wherein, the process that carborization is produced pseudo-boehmite is as follows: the industrial sodium aluminate solution of low-temperature and low-concentration of take is raw material, passes into fast high concentration CO
2gas, as in precipitation agent and plastic, is controlled the pH value of plastic temperature and terminal, then, through intensification, aging, washing, drying, obtains common pseudo-boehmite product.
Carborization prepares pseudo-boehmite can rely on alumina producer, and raw material sources are extensive, production cost is low, and the waste liquid in production can recycle in the returning alumina Production Flow Chart, substantially without waste material, discharges, and environmental pollution is little, is widely used thus.But the process that carborization prepares pseudo-boehmite mostly is interruption production, facility investment is large, personnel labor intensity is large, productivity is low, and the quality product fluctuation is large.
Summary of the invention
The interruption production for preparing pseudo-boehmite in order to solve existing carborization, labour intensity is large, productivity is low, and the problem such as quality product fluctuation is large, the invention provides a kind of method of utilizing ejector to produce continuously pseudo-boehmite, comprise: by sodium aluminate solution, join continuously in ejector, and the mixed gas of air and carbonic acid gas is passed in described ejector, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide; Control the flow of mixed gas and sodium aluminate solution, the slurry temperature that reaction is generated is 25～55 ℃, and the pH value is 9.5～11; By slip through overaging, filter, be washed to neutrality and drying treatment, obtain pseudo-boehmite.
The alumina concentration of described sodium aluminate solution is 15～80g/L.
Described by slip through overaging, the step of filtering, be washed to neutrality and drying treatment specifically comprises:
Slip is passed into to ageing tank and heat up, control aging temperature and be not less than 90 ℃;
By the slurry filtration after aging intensification, filter cake is washed to neutrality;
Filter cake after washing is carried out to drying treatment.
The drying temperature of described drying treatment is 100～120 ℃.
The percent by volume of described carbon dioxide in gas mixture is 30%～100%, and the pressure of described mixed gas is 0.1MPa～0.3MPa.
Described ejector is single ejector or in series by a plurality of ejectors.
The flow ratio of described mixed gas and sodium aluminate solution is 10～100.
The characteristics such as method of the present invention has continuous production, technique is simple, production efficiency is high, constant product quality, facility investment are few, simple and convenient operation and maintenance, reliable, energy consumption low and labour intensity is little, be specially adapted to the production of common pseudo-boehmite or ultrafine aluminium hydroxide, aluminum oxide.By the inventive method, large, the pore volume of the specific surface area of prepared pseudo-boehmite, peptization all can reach the quality standard of common pseudo-boehmite.
The accompanying drawing explanation
Fig. 1 is that the ejector that utilizes of the embodiment of the present invention is produced the method flow diagram of pseudo-boehmite continuously.
Embodiment
Below in conjunction with drawings and Examples, technical solution of the present invention is further described.
Referring to Fig. 1, the embodiment of the present invention provides a kind of method of utilizing ejector to produce continuously pseudo-boehmite, and the method comprises the steps:
Step 101: join continuously in ejector by sodium aluminate solution, and the mixed gas of air and carbonic acid gas is passed in this ejector, making sodium aluminate solution form powerful liquid stream fully mixes with carbon dioxide, realize the rapid reaction of sodium aluminate solution and carbon dioxide, produce many and fine and smooth bubble;
In the present embodiment, the alumina concentration of sodium aluminate solution is 15～80g/L; The percent by volume of carbon dioxide in gas mixture is 30%～100%, and the pressure of mixed gas is 0.1MPa～0.3MPa; In concrete production practice, can be according to the concentration of sodium aluminate solution, one or more ejector series connection of choice for use, during common lower concentration, single ejector can meet traffic requirement, can consider to use a plurality of ejectors series connection when alumina concentration is greater than 40g/L.
Step 102: control the flow ratio of mixed gas and sodium aluminate solution 10～100, the slurry temperature that reaction is generated is 25～55 ℃, and the pH value is 9.5～11, stops plastic;
Step 103: by slip through overaging, filter, be washed to neutrality and drying treatment, obtain pseudo-boehmite;
In the present embodiment, first slip is passed into to ageing tank and heat up, control aging temperature and be not less than 90 ℃; By the slurry filtration after aging intensification, filter cake is washed to neutrality; Again the filter cake after washing is carried out to drying treatment, drying temperature is 100～120 ℃, finally obtains pseudo-boehmite.
Produce continuously the method for pseudo-boehmite for the ejector that utilizes of more clearly setting forth the embodiment of the present invention, further illustrate below by several typical Application Examples.
Embodiment 1
The sodium aluminate solution that is 15.9g/L by alumina concentration joins in ejector by pump continuously, pass into the mixed gas of air and carbonic acid gas to this ejector simultaneously, the percent by volume of carbon dioxide in gas mixture is 30%, the pressure of mixed gas is 0.3MPa, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide, produce many and fine and smooth bubble; The flow ratio of controlling mixed gas and sodium aluminate solution is 10, and the slurry temperature that reaction is generated is that 25 ℃ and pH value are 9.5 o'clock, stops plastic; The slip of reaction gained is delivered to ageing tank by road, and slip heats up in ageing tank, and aging temperature is 90 ℃; By the slurry filtration after aging, filter cake is washed to neutrality; Filter cake after washing is carried out to drying and processing, and bake out temperature is 100 ℃, finally obtains common pseudo-boehmite product, and its physico-chemical property sees the following form 1.
Embodiment 2
The sodium aluminate solution that is 25.2g/L by alumina concentration joins in ejector by pump continuously, pass into the mixed gas of air and carbonic acid gas to this ejector simultaneously, the percent by volume of carbon dioxide in gas mixture is 40%, the pressure of mixed gas is 0.2MPa, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide, produce many and fine and smooth bubble; The flow ratio of controlling mixed gas and sodium aluminate solution is 30, and the slurry temperature that reaction is generated is that 30 ℃ and pH value are 9.5 o'clock, stops plastic; The slip of reaction gained is delivered to ageing tank by pipeline, and slip heats up in ageing tank, and aging temperature is 95 ℃; By the slurry filtration after aging, filter cake is washed to neutrality; Filter cake after washing is carried out to drying and processing, and bake out temperature is 102 ℃, finally obtains common pseudo-boehmite product, and its physico-chemical property sees the following form 1.
Embodiment 3
The sodium aluminate solution that is 33.6g/L by alumina concentration joins in ejector by pump continuously, pass into the mixed gas of air and carbonic acid gas to this ejector simultaneously, the percent by volume of carbon dioxide in gas mixture is 50%, the pressure of mixed gas is 0.15MPa, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide, produce many and fine and smooth bubble; The flow ratio of controlling mixed gas and sodium aluminate solution is 40, and the slurry temperature that reaction is generated is that 35 ℃ and pH value are 10 o'clock, stops plastic; The slip of reaction gained is delivered to ageing tank by pipeline, and slurry heats up in ageing tank, and aging temperature is 100 ℃; By the slurry filtration after aging, filter cake is washed to neutrality; Filter cake after washing is carried out to drying and processing, and bake out temperature is 105 ℃, finally obtains common pseudo-boehmite product, and its physico-chemical property sees the following form 1.
Embodiment 4
The sodium aluminate solution that is 40.4g/L by alumina concentration joins in ejector by pump continuously, pass into the mixed gas of air and carbonic acid gas to this ejector simultaneously, the percent by volume of carbon dioxide in gas mixture is 60%, the pressure of mixed gas is 0.15MPa, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide, produce many and fine and smooth bubble; The flow ratio of controlling mixed gas and sodium aluminate solution is 50, and the slurry temperature that reaction is generated is that 40 ℃ and pH value are 10 o'clock, stops plastic; The slip of reaction gained is delivered to ageing tank by pipeline, and slip heats up in ageing tank, and aging temperature is 100 ℃; By the slurry filtration after aging, filter cake is washed to neutrality; Filter cake after washing is carried out to drying and processing, and bake out temperature is 110 ℃, finally obtains common pseudo-boehmite product, and its physico-chemical property sees the following form 1.
Embodiment 5
The sodium aluminate solution that is 55.3g/L by alumina concentration joins in ejector by pump continuously, pass into the mixed gas of air and carbonic acid gas to this ejector simultaneously, the percent by volume of carbon dioxide in gas mixture is 70%, the pressure of mixed gas is 0.14MPa, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide, produce many and fine and smooth bubble; The flow ratio of controlling mixed gas and sodium aluminate solution is 60, and it is 11 o'clock with the pH value that the slurry temperature that reaction is generated is 45 ℃, stops plastic; The slip of reaction gained is delivered to ageing tank by pipeline, and slip heats up in ageing tank, and aging temperature is 102 ℃; By the slurry filtration after aging, filter cake is washed to neutrality; Filter cake after washing is carried out to drying and processing, and bake out temperature is 115 ℃, finally obtains common pseudo-boehmite product, and its physico-chemical property sees the following form 1.
Embodiment 6
The sodium aluminate solution that is 64.7g/L by alumina concentration joins in ejector by pump continuously, pass into the mixed gas of air and carbonic acid gas to this ejector simultaneously, the percent by volume of carbon dioxide in gas mixture is 80%, the pressure of mixed gas is 0.13MPa, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide, produce many and fine and smooth bubble; The flow ratio of controlling mixed gas and sodium aluminate solution is 80, and the slurry temperature that reaction is generated is that 50 ℃ and pH value are 11 o'clock, stops plastic; The slip of reaction gained is delivered to ageing tank by pipeline, and slip heats up in ageing tank, and aging temperature is 95 ℃; By the slurry filtration after aging, filter cake is washed to neutrality; Filter cake after washing is carried out to drying and processing, and bake out temperature is 120 ℃, finally obtains common pseudo-boehmite product, and its physico-chemical property sees the following form 1.
Embodiment 7
The sodium aluminate solution that is 73.5g/L by alumina concentration joins in ejector by pump continuously, pass into the mixed gas of air and carbonic acid gas to this ejector simultaneously, the percent by volume of carbon dioxide in gas mixture is 100%, the pressure of mixed gas is 0.12MPa, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide, produce many and fine and smooth bubble; The flow ratio of controlling mixed gas and sodium aluminate solution is 90, and the slurry temperature that reaction is generated is that 55 ℃ and pH value are 11 o'clock, stops plastic; The slip of reaction gained is delivered to ageing tank by pipeline, and slip heats up in ageing tank, and aging temperature is 97 ℃; By the slurry filtration after aging, filter cake is washed to neutrality; Filter cake after washing is carried out to drying and processing, and bake out temperature is 120 ℃, finally obtains common pseudo-boehmite product, and its physico-chemical property sees the following form 1.
Embodiment 8
The sodium aluminate solution that is 80g/L by alumina concentration joins in ejector by pump continuously, pass into the mixed gas of air and carbonic acid gas to this ejector simultaneously, the percent by volume of carbon dioxide in gas mixture is 100%, the pressure of mixed gas is 0.1MPa, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide, produce many and fine and smooth bubble; The flow ratio of controlling mixed gas and sodium aluminate solution is 100, and the slurry temperature that reaction is generated is that 55 ℃ and pH value are 10.5 o'clock, stops plastic; The slip of reaction gained is delivered to ageing tank by pipeline, and slip heats up in ageing tank, and aging temperature is 94 ℃; By the slurry filtration after aging, filter cake is washed to neutrality; Filter cake after washing is carried out to drying and processing, and bake out temperature is 120 ℃, finally obtains common pseudo-boehmite product, and its physico-chemical property sees the following form 1.
Table 1
| Character | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 |
| Peptization, % | 95.2 | 97.0 | 96.2 | 98.3 | 95.7 | 95.4 | 96.2 | 98.21 |
| Specific surface, m 2/g | 320.92 | 337.45 | 350.18 | 348.24 | 293 | 311.66 | 394.52 | 362.14 |
| Pore volume, ml/L | 0.31 | 0.30 | 0.33 | 0.35 | 0.32 | 0.30 | 0.33 | 0.30 |
As can be seen from Table 1, the prepared pseudo-boehmite by the method for the present embodiment, specific surface area is large, and pore volume, peptization all can reach the quality standard of common pseudo-boehmite.The analysis of pore volume and specific surface area in table 1, can adopt the low temperature liquid nitrogen absorption method to complete.(annotate: in common pseudo-boehmite quality standard Q/Chalco A020-2004, peptization>=95%, specific surface>=250m
2/ g, pore volume>=0.3ml/L)
The present embodiment joins sodium aluminate solution in ejector continuously by pump, overcome pseudo-boehmite and be interrupted the defect of producing, there is continuous production, the characteristics such as technique is simple, facility investment is few, simple and convenient operation and maintenance, reliable, energy consumption is low and labour intensity is little, improved the work production rate, stablize quality product, be specially adapted to the production of common pseudo-boehmite or ultrafine aluminium hydroxide, aluminum oxide.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a method of utilizing ejector to produce continuously pseudo-boehmite, is characterized in that, comprising:
Sodium aluminate solution is joined in ejector continuously, and the mixed gas of air and carbonic acid gas is passed in described ejector, make sodium aluminate solution form powerful liquid stream and fully mix with carbon dioxide; Control the flow of mixed gas and sodium aluminate solution, the slurry temperature that reaction is generated is 25～55 ℃, and the pH value is 9.5～11; Slip through overaging, filter, be washed to neutrality and drying treatment, obtain pseudo-boehmite.
2. the method for utilizing ejector to produce continuously pseudo-boehmite as claimed in claim 1, is characterized in that, the alumina concentration of described sodium aluminate solution is 15～80g/L.
3. the method for utilizing ejector to produce continuously pseudo-boehmite as claimed in claim 1, is characterized in that, described by slip through overaging, the step of filtering, be washed to neutrality and drying treatment specifically comprises:
Slip is passed into to ageing tank and heat up, control aging temperature and be not less than 90 ℃;
By the slurry filtration after aging intensification, filter cake is washed to neutrality;
Filter cake after washing is carried out to drying treatment.
4. the method for utilizing ejector to produce continuously pseudo-boehmite as claimed in claim 3, is characterized in that, the drying temperature of described drying treatment is 100～120 ℃.
5. the method for utilizing ejector to produce continuously pseudo-boehmite as claimed in claim 1, is characterized in that, the percent by volume of described carbon dioxide in gas mixture is 30%～100%, and the pressure of described mixed gas is 0.1MPa～0.3MPa.
6. the method for utilizing ejector to produce continuously pseudo-boehmite as claimed in claim 1, is characterized in that, described ejector is single ejector or in series by a plurality of ejectors.
7. the method for utilizing ejector to produce continuously pseudo-boehmite as claimed in claim 1, is characterized in that, the flow ratio of described mixed gas and sodium aluminate solution is 10～100.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106946278A (en) * | 2016-01-07 | 2017-07-14 | 中国石油化工股份有限公司 | A kind of boehmite and preparation method thereof |
| CN112551565A (en) * | 2021-01-07 | 2021-03-26 | 岳阳明科催化技术有限公司 | Carbonizing device and method for producing macroporous pseudo-boehmite by carbonization method |
| WO2023232021A1 (en) * | 2022-05-30 | 2023-12-07 | 中国石油化工股份有限公司 | Pseudo-boehmite and preparation method therefor, and catalytic cracking catalyst comprising pseudo-boehmite and preparation and use thereof |
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| CN85100161A (en) * | 1985-04-01 | 1986-07-30 | 山东省铝厂 | Carbonating technology (CO 2Method) produces pseudo-boehmite |
| CN1583568A (en) * | 2004-06-03 | 2005-02-23 | 山东铝业股份有限公司 | Preparation of pseudo thinolite |
| CN101172631A (en) * | 2007-11-09 | 2008-05-07 | 中国铝业股份有限公司 | Method of producing pseudo boehmite |
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2013
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Patent Citations (4)
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| US4492682A (en) * | 1982-01-29 | 1985-01-08 | Rhone-Poulenc Specialites Chimiques | Preparation of ultrapure boehmites and/or pseudo-boehmites |
| CN85100161A (en) * | 1985-04-01 | 1986-07-30 | 山东省铝厂 | Carbonating technology (CO 2Method) produces pseudo-boehmite |
| CN1583568A (en) * | 2004-06-03 | 2005-02-23 | 山东铝业股份有限公司 | Preparation of pseudo thinolite |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106946278A (en) * | 2016-01-07 | 2017-07-14 | 中国石油化工股份有限公司 | A kind of boehmite and preparation method thereof |
| CN112551565A (en) * | 2021-01-07 | 2021-03-26 | 岳阳明科催化技术有限公司 | Carbonizing device and method for producing macroporous pseudo-boehmite by carbonization method |
| WO2023232021A1 (en) * | 2022-05-30 | 2023-12-07 | 中国石油化工股份有限公司 | Pseudo-boehmite and preparation method therefor, and catalytic cracking catalyst comprising pseudo-boehmite and preparation and use thereof |
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