CN103848453B - A kind of method reducing the refinement of seeded precipitation Period Process - Google Patents
A kind of method reducing the refinement of seeded precipitation Period Process Download PDFInfo
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- CN103848453B CN103848453B CN201210496388.XA CN201210496388A CN103848453B CN 103848453 B CN103848453 B CN 103848453B CN 201210496388 A CN201210496388 A CN 201210496388A CN 103848453 B CN103848453 B CN 103848453B
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Abstract
The present invention relates to the method reducing the refinement of seeded precipitation Period Process, comprise the steps: that the groove discharging of seeded precipitation end is through finished product cyclone classification, classification underflow does finished product, Grading Overflow enters seed cyclone classification again, the seed that swirler underflow adds when doing normal production after filter filters, join and decompose in first groove, swirler overflow is delivered in storage facility and is preserved separately after filter filters, detect product grading at any time, run quickly in thick process in granularity, fine particle seed is supplemented to add to and decomposes in first groove.Can be reduced the impact of periodic thinning by this patent, keep decomposition course hydroxide particle-size to stablize, production operation is steady.
Description
Technical field
The present invention relates to a kind of method reducing the refinement of seeded precipitation Period Process, belong to technical field of alumina production.
Background technology
In the seeded precipitation process of alumina producing, there is aluminum hydroxide product granularity period wave phenomenon.Aluminum hydroxide particles " is constantly grown up " in whole decomposition course, when these particle growth are to critical granularity (+45 μm about 90 ~ 95%), granule surface activity significantly reduces, ultra-fine (-5 μm) particle of particle surface attachment comes off at short notice, and hydroxide particle-size state is undergone mutation.Once ultra-fine grain aluminium hydroxide produces, the corresponding generation of seed-coat " great-jump-forward " changes, but original thick (40-80 μm) particle does not reduce, now Two particle size relative volume has a long way to go, the volume shared by ultra-fine grain aluminium hydroxide of new generation and part by weight are very little, little on the overall grain size level impact of decomposing discharging aluminium hydroxide within for some time, but along with the continuous generation of ultra-fine grain aluminium hydroxide, grow up and coarse particles aluminium hydroxide as product discharge system, the granularity of discharging aluminium hydroxide starts to decline gradually, until when former coarse particles aluminium hydroxide residue is little, discharging hydroxide particle-size touches the bottom, grow up gradually along with fine particle, the bottom out of coarse fodder hydroxide particle-size, form loop cycle.
In the research of scientific worker, considered the time delaying to produce explosive refinement by raising temperature of initial decomposition, weaken the amplitude of cyclic fluctuation, but temperature has dual function, reduce temperature and can improve rate of decomposition, but the degree of supersaturation of low temperature aluminium acid sodium solution is large, decomposition rate is fast, if there is no enough amassing for the seed-coat decomposed, easily there is secondary nucleation, thus cause product particle size refinement; Raised temperature can suppress secondary nucleation, promotes the carrying out of agglomeration, but the degree of supersaturation of solution can be made to reduce, slow down decomposition rate, reduces rate of decomposition.
Though through the research work that various countries scientific worker is a large amount of for many years, but Bayer process For Aluminium Hydroxide Settling In The Process of Alumina Manufacture granularity occurs that the problem of periodic thinning fails to be well solved so far, badly influences decomposition course quantity-produced and normally carries out.
Summary of the invention
The present invention is exactly a kind of method reducing the refinement of seeded precipitation Period Process provided to solve the problems of the technologies described above, and object is the impact in order to reduce periodic thinning, realizes decomposition course and normally produces continuously.
For reaching a kind of method reducing the refinement of seeded precipitation Period Process of above-mentioned purpose the present invention, it is characterized in that: the groove discharging of seeded precipitation end is through finished product cyclone classification, classification underflow does finished product, Grading Overflow enters seed cyclone classification again, the seed that seed swirler underflow adds when doing normal production after filter filters, join and decompose in first groove, the overflow of seed swirler is delivered in storage facility and is preserved separately as fine particle seed after filter filters, detect product grading at any time, run quickly in thick process in granularity, fine particle seed is supplemented to add to and decomposes in first groove.
Seed cyclone classification underflow, after filtering as the exclusive source adding seeded precipitation system seed during normal production.
The overflow of seed cyclone classification, fine particle seed is preserved separately in storage facility as a supplement after filtering, does not add seeded precipitation system when normal production.
Finished product cyclone classification underflow, its product grading of periodic detection.
The fine particle seed of independent preservation, according to product grading change, runs quickly in thick process in granularity, adds to and decompose in first groove.
By method described in this patent, can prevent sodium aluminate solution decompose themselves from separating out superfine aluminum hydroxide particles, ensure enough fine particle seeds and add system in product granularity runs quickly thick process, all the time in decomposition course, maintain the aluminium hydroxide seed of various grade, realize fine particle seed and constantly add system, intermediate particle is by thin to slightly growing up continuously, and coarse particles is constantly grown up and discharged system as finished product, realizes decomposition course hydroxide particle-size and stablizes.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
In figure: 1, decompose last groove; 2, discharging is decomposed; 3, product swirler is become; 4, finished product; 5, Grading Overflow; 6, seed swirler; 7, swirler underflow; 8, filter; 9, seed; 10, first groove is decomposed; 11, swirler overflow; 12, fine particle seed; 13, storage facility.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but protection scope of the present invention not limit by embodiment.
As shown in Figure 1, the present invention is a kind of method reducing the refinement of seeded precipitation Period Process, comprise the steps: that seeded precipitation end groove 1 discharging 2 is through becoming product swirler 3 classification, classification underflow does finished product 4, Grading Overflow 5 enters seed swirler 6 classification again, the seed 9 that seed swirler 6 underflow 7 adds when doing normal production after filter 8 filters, add and decompose in first groove 10, seed swirler 6 overflow 11 is after filter 8 filters, the fine particle seed 12 obtained is delivered in storage facility 13 and is preserved separately, detect finished product 4 granularity at any time, run quickly in thick process in granularity, fine particle seed 12 is supplemented to add to and decomposes in first groove 10.
Claims (5)
1. one kind is reduced the method for seeded precipitation Period Process refinement, it is characterized in that: the groove discharging of seeded precipitation end is through finished product cyclone classification, classification underflow does finished product, Grading Overflow enters seed cyclone classification again, the seed that seed swirler underflow adds when doing normal production after filter filters, join and decompose in first groove, the overflow of seed swirler is delivered in storage facility and is preserved separately after filter filters, detect product grading at any time, run quickly in thick process in granularity, fine particle seed is supplemented to add to and decomposes in first groove.
2. a kind of method reducing the refinement of seeded precipitation Period Process according to claim 1, is characterized in that: seed cyclone classification underflow, after filtering as the exclusive source adding seeded precipitation system seed during normal production.
3. a kind of method reducing the refinement of seeded precipitation Period Process according to claim 1, it is characterized in that: the overflow of seed cyclone classification, fine particle seed is preserved separately in storage facility as a supplement after filtering, does not add seeded precipitation system when normal production.
4. a kind of method reducing the refinement of seeded precipitation Period Process according to claim 1, is characterized in that: finished product cyclone classification underflow, its product grading of periodic detection.
5. a kind of method reducing the refinement of seeded precipitation Period Process according to claim 1, is characterized in that: the fine particle seed preserved separately, according to product grading change, runs quickly in thick process in granularity, adds to and decompose in first groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210496388.XA CN103848453B (en) | 2012-11-28 | 2012-11-28 | A kind of method reducing the refinement of seeded precipitation Period Process |
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| CN201210496388.XA CN103848453B (en) | 2012-11-28 | 2012-11-28 | A kind of method reducing the refinement of seeded precipitation Period Process |
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| CN103848453A CN103848453A (en) | 2014-06-11 |
| CN103848453B true CN103848453B (en) | 2015-09-30 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105293543A (en) * | 2014-06-27 | 2016-02-03 | 沈阳铝镁设计研究院有限公司 | Method for improving first-stage decomposition effect |
| CN104724739B (en) * | 2015-03-13 | 2016-08-24 | 云南文山铝业有限公司 | The method processing decomposition of crystal seed aluminum hydroxide slurry |
Citations (5)
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| CN101070170A (en) * | 2007-05-30 | 2007-11-14 | 山东铝业股份有限公司 | Small two-stage method aluminium hydroxide crystal seed decomposing method |
| CN101070169A (en) * | 2007-05-30 | 2007-11-14 | 山东铝业股份有限公司 | Method for resolving aluminium-oxide granularity periodic and explosive refining |
| CN201949691U (en) * | 2010-12-29 | 2011-08-31 | 中国瑞林工程技术有限公司 | Authigenic crystal seed circulating settling system |
| CN102527098A (en) * | 2010-12-29 | 2012-07-04 | 中国瑞林工程技术有限公司 | Self-growth inoculating crystal circulating and precipitating system and processing method |
| CN103159241A (en) * | 2011-12-15 | 2013-06-19 | 贵阳铝镁设计研究院有限公司 | Two-section decomposition process for alumina production by Bayer process |
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2012
- 2012-11-28 CN CN201210496388.XA patent/CN103848453B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101070170A (en) * | 2007-05-30 | 2007-11-14 | 山东铝业股份有限公司 | Small two-stage method aluminium hydroxide crystal seed decomposing method |
| CN101070169A (en) * | 2007-05-30 | 2007-11-14 | 山东铝业股份有限公司 | Method for resolving aluminium-oxide granularity periodic and explosive refining |
| CN201949691U (en) * | 2010-12-29 | 2011-08-31 | 中国瑞林工程技术有限公司 | Authigenic crystal seed circulating settling system |
| CN102527098A (en) * | 2010-12-29 | 2012-07-04 | 中国瑞林工程技术有限公司 | Self-growth inoculating crystal circulating and precipitating system and processing method |
| CN103159241A (en) * | 2011-12-15 | 2013-06-19 | 贵阳铝镁设计研究院有限公司 | Two-section decomposition process for alumina production by Bayer process |
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| "烧结法种分氢氧化铝的粒度研究";张建栋;《中国科技信息》;20051231(第15期);第10、17页 * |
| "种分分解粒度两极分化期间的调整与控制";于勇;《轻金属》;20121231(第8期);第12-14、18页 * |
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