CN105197970A - Method for improving two-stage decomposition effect - Google Patents
Method for improving two-stage decomposition effect Download PDFInfo
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- CN105197970A CN105197970A CN201410295552.XA CN201410295552A CN105197970A CN 105197970 A CN105197970 A CN 105197970A CN 201410295552 A CN201410295552 A CN 201410295552A CN 105197970 A CN105197970 A CN 105197970A
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Abstract
The invention relates to a two-stage decomposition method. The method comprises the following steps: a discharged material of a two-stage decomposition end seed precipitation tank is pumped into a high-frequency multi-stage fine screen; an oversize product, namely, an aluminium hydroxide product, of the high-frequency multi-stage fine screen automatically flows into a horizontal pan filter, and then enters a roasting furnace, and an aluminium oxide product is obtained; a first-grade undersize product of the high-frequency multi-stage fine screen enters a secondary screen; a second-grade oversize product is added into a two-stage front decomposing tank as coarse seeds; a second-grade undersize product enters a fine seed settling tank; a seed precipitation mother solution overflows out of the fine seed settling tank, and is conveyed into an evaporation procedure; underflow of the fine seed settling tank flows into a fine seed filter; filtrate of the fine seed filter is returned to the fine seed settling tank; filter cakes of the fine seed filter are returned to a first-stage front seed precipitation tank as fine seeds. Compared with hydrocyclone classification, the method has the following advantages: the classification efficiency is high, the method is easy to control, the proportion of particles with the particle size smaller than 45 [mu]m in the aluminium oxide product is decreased, and the product conforms to the standard of sand-like aluminum oxide.
Description
Technical field
The present invention relates to a kind of two sections of decomposition methods, particularly relate to a kind of method improving aluminum hydroxide product and thickness seed grading two sections of discomposing effect, belong to technical field of alumina production.
Background technology
Along with aluminum electrolysis industry more and more payes attention to improvement and the environment protection of working condition, the requirement of electrolysis of aluminum to raw alumina is also increased increasingly.Alumina product granularity is larger to electrolysis influence, be greater than that the coarse particles content of 150 μm is high can affect aluminum oxide dissolution rate in the electrolyte, and be less than 45 μm of fine fraction content being particularly less than 20 μm and increase, Dust Capacity in electrolysis operation can be made to increase, and affect the accurate blanking of right place.Alumina product quality and size-grade distribution are determined by crystalline aluminum hydroxide degree and granularity, are namely determined by seeded precipitation operation.
Decomposition technique conventional at present has two kinds, one is the lst-stage precipitation Technology that is representative with method aluminum technology, two sections of decomposition technique technology that another kind is is representative with Chinalco of Switzerland technology, namely seminal fluid enters lst-stage precipitation groove together with thin seed, completes close grain agglomeration, and the discharging of lst-stage precipitation groove send two sections to decompose first groove after intersegmental cooling, add thick seed simultaneously, stop the sufficiently long time, complete crystal seed and grow up, improve crystalline structure.Decomposer discharging needs classified equipment to carry out classification, obtains aluminium hydroxide finished product, thick seed and thin seed respectively, usually selects hydrocyclone as stage equipment at present.Decomposer discharging is through finished product hydroclone classification, classification underflow send horizontal table filter as aluminium hydroxide finished product, overflow returns decomposer or removes seed grading swirler, join two sections as thick seed after seed cyclone classification underflow goes vertical-disk filter to filter and decompose first groove, overflow joins the first groove of lst-stage precipitation as thin seed after sedimentation, filtration, washing.The mainly sodium aluminate solution crystallization agglomeration of its technological core, grain growth segmentation are carried out, and add the crystal seed of different-grain diameter respectively, and set rational temperature drop system and suitable resolving time.The alumina crystal structure that this method is produced is perfect, granularity intensity is all better, but due to the restriction of the operation mechanism of hydrocyclone own, cannot fixing quantity seed granularity, therefore is difficult to ensure discomposing effect.
Summary of the invention
In order to solve the problems of the technologies described above the method that the invention provides a kind of raising two sections of discomposing effect, object strictly controls aluminum hydroxide product granularity, and then reduce the ratio that in alumina product, granularity is less than 45 μm; Thick seed and thin seed granularity distribution range can also be controlled, grow up for sodium aluminate solution crystallization agglomeration and crystal and the crystal seed of applicable granularity is provided.
For achieving the above object, the present invention realizes in the following way: the method for a kind of raising two sections of discomposing effect, two sections are decomposed kind of separating groove discharging with being pumped into the multistage dusting cover of high frequency, the screen overflow aluminum hydroxide product of the multistage dusting cover of high frequency flows automatically to horizontal table filter, then enters stoving oven and obtains alumina product; High frequency multistage dusting cover one-level screen underflow enters secondary screen cloth, secondary screen overflow joins two sections as thick seed and decomposes first groove, secondary screen underflow enters into thin seed subsider, thin seed subsider overflow seed precipitation solution is sent to evaporization process, thin seed subsider underflow enters into thin seed filter, thin seed filter filtrate returns thin seed subsider, and the filter cake of thin seed filter returns the first groove of one section of seed precipitation tank as thin seed.
The one-level screen mesh size of the multistage dusting cover of high frequency 80 ~ 150 μm.
The secondary screen mesh size of the multistage dusting cover of high frequency 50 ~ 80 μm.
The present invention, compared with hydroclone classification, has the following advantages:
(1) fractional efficiency is high, and a multistage dusting cover of high frequency can replace 2 grades of hydrocyclones, is easy to control;
(2) aluminum hydroxide product granularity can be controlled, the large-granular aluminium hydroxide product that crystallization degree is high can be obtained, reduce the ratio that in alumina product, granularity is less than 45 μm, make product meet sandy alumina standard;
(3) the secondary screen overflow of the multistage dusting cover of high frequency can be used as thick seed and directly joins two sections of first grooves of decomposition, can cancel thick seed filter, reduce investment;
(4) the secondary screen cloth of the multistage dusting cover of high frequency can control thin seed grain size, improves crystal seed quality, is conducive to crystallization agglomeration;
(5) improve aluminum hydroxide product solids in pulp, decrease mass flow, horizontal table filter area can be reduced;
(6) compare with hydrocyclone, high frequency multistage dusting cover field adjustable is simple to operate, and operational efficiency is high.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
In accompanying drawing: 1, one section of first groove of seed precipitation tank; 2, two sections are decomposed first groove; 3, two sections are decomposed kind of a separating groove; 4, the multistage dusting cover of high frequency; 5, aluminum hydroxide product; 6, horizontal table filter; 7, thick seed; 8, secondary screen underflow; 9, thin seed subsider; 10, seed precipitation solution; 11, evaporization process; 12, thin seed filter filtrate; 13, thin seed filter; 14, thin seed.
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.
Embodiment 1
The method of a kind of raising of the present invention two sections of discomposing effect as shown in the figure, two sections are decomposed kind of separating groove 3 discharging with being pumped into the multistage dusting cover 4 of high frequency, the one-level screen mesh size of the multistage dusting cover of high frequency 100 μm, the screen overflow aluminum hydroxide product 5 of the multistage dusting cover 4 of high frequency flows automatically to horizontal table filter 6, then enters stoving oven and obtains alumina product; High frequency multistage dusting cover 4 one-level screen underflow enters secondary screen cloth, the secondary screen mesh size of the multistage dusting cover of high frequency 70 μm, secondary screen overflow joins two sections as thick seed 7 and decomposes first groove 2, secondary screen underflow 8 enters into thin seed subsider 9, thin seed subsider 9 overflow seed precipitation solution 10 is sent to evaporization process 11, thin seed subsider 9 underflow enters into thin seed filter 13, thin seed filter filtrate 12 returns thin seed subsider 9, and the filter cake of thin seed filter 13 returns the first groove 1 of one section of seed precipitation tank as thin seed 14.
Embodiment 2
The method of a kind of raising of the present invention two sections of discomposing effect as shown in the figure, two sections are decomposed kind of separating groove 3 discharging with being pumped into the multistage dusting cover 4 of high frequency, the one-level screen mesh size of the multistage dusting cover of high frequency 150 μm, the screen overflow aluminum hydroxide product 5 of the multistage dusting cover 4 of high frequency flows automatically to horizontal table filter 6, then enters stoving oven and obtains alumina product; High frequency multistage dusting cover 4 one-level screen underflow enters secondary screen cloth, the secondary screen mesh size of the multistage dusting cover of high frequency 50 μm, secondary screen overflow joins two sections as thick seed 7 and decomposes first groove 2, secondary screen underflow 8 enters into thin seed subsider 9, thin seed subsider 9 overflow seed precipitation solution 10 is sent to evaporization process 11, thin seed subsider 9 underflow enters into thin seed filter 13, thin seed filter filtrate 12 returns thin seed subsider 9, and the filter cake of thin seed filter 13 returns the first groove 1 of one section of seed precipitation tank as thin seed 14.
Embodiment 3
The method of a kind of raising of the present invention two sections of discomposing effect as shown in the figure, two sections are decomposed kind of separating groove 3 discharging with being pumped into the multistage dusting cover 4 of high frequency, the one-level screen mesh size of the multistage dusting cover of high frequency 130 μm, the screen overflow aluminum hydroxide product 5 of the multistage dusting cover 4 of high frequency flows automatically to horizontal table filter 6, then enters stoving oven and obtains alumina product; High frequency multistage dusting cover 4 one-level screen underflow enters secondary screen cloth, the secondary screen mesh size of the multistage dusting cover of high frequency 80 μm, secondary screen overflow joins two sections as thick seed 7 and decomposes first groove 2, secondary screen underflow 8 enters into thin seed subsider 9, thin seed subsider 9 overflow seed precipitation solution 10 is sent to evaporization process 11, thin seed subsider 9 underflow enters into thin seed filter 13, thin seed filter filtrate 12 returns thin seed subsider 9, and the filter cake of thin seed filter 13 returns the first groove 1 of one section of seed precipitation tank as thin seed 14.
Claims (3)
1. improve a method for two sections of discomposing effect, be characterised in that two sections are decomposed kind of separating groove discharging with being pumped into the multistage dusting cover of high frequency, the screen overflow aluminum hydroxide product of the multistage dusting cover of high frequency flows automatically to horizontal table filter, then enters stoving oven and obtains alumina product; High frequency multistage dusting cover one-level screen underflow enters secondary screen cloth, secondary screen overflow joins two sections as thick seed and decomposes first groove, secondary screen underflow enters into thin seed subsider, thin seed subsider overflow seed precipitation solution is sent to evaporization process, thin seed subsider underflow enters into thin seed filter, thin seed filter filtrate returns thin seed subsider, and the filter cake of thin seed filter returns the first groove of one section of seed precipitation tank as thin seed.
2. the method for a kind of raising according to claim 1 two sections of discomposing effect, is characterized in that the one-level screen mesh size 80 ~ 150 μm of the multistage dusting cover of high frequency.
3. the method for a kind of raising according to claim 1 two sections of discomposing effect, is characterized in that the secondary screen mesh size 50 ~ 80 μm of the multistage dusting cover of high frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410295552.XA CN105197970B (en) | 2014-06-27 | 2014-06-27 | Method for improving two-stage decomposition effect |
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| CN201410295552.XA CN105197970B (en) | 2014-06-27 | 2014-06-27 | Method for improving two-stage decomposition effect |
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| CN105197970A true CN105197970A (en) | 2015-12-30 |
| CN105197970B CN105197970B (en) | 2017-02-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110127737A (en) * | 2019-07-01 | 2019-08-16 | 济源职业技术学院 | Kind of the device for dividing periodic thinning is prevented in Bayer process alumina producing |
| CN112456524A (en) * | 2020-12-10 | 2021-03-09 | 沈阳铝镁设计研究院有限公司 | Method for treating fine seeds by using horizontal tilting disk filter |
| CN113620330A (en) * | 2021-09-26 | 2021-11-09 | 沈阳铝镁设计研究院有限公司 | Grading and filtering process for decomposing aluminum hydroxide by two stages |
Citations (4)
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| CN1556035A (en) * | 2003-12-31 | 2004-12-22 | 中国铝业股份有限公司 | Sandlike aluminium oxide disintegration technology |
| WO2007009377A1 (en) * | 2005-07-18 | 2007-01-25 | China Aluminum International Engineering Corporation Limited | A process for preparing powdery alumina from low concentration solution by seed decomposition |
| CN1962448A (en) * | 2006-11-23 | 2007-05-16 | 沈阳铝镁设计研究院 | Two-stage decomposition for producing sand-like alumina product and seed classification process |
| CN101927236A (en) * | 2009-06-24 | 2010-12-29 | 鞍钢集团矿业公司 | Lean hematite technology combining dressing-fine screening and shaking table gravity separation |
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2014
- 2014-06-27 CN CN201410295552.XA patent/CN105197970B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1556035A (en) * | 2003-12-31 | 2004-12-22 | 中国铝业股份有限公司 | Sandlike aluminium oxide disintegration technology |
| WO2007009377A1 (en) * | 2005-07-18 | 2007-01-25 | China Aluminum International Engineering Corporation Limited | A process for preparing powdery alumina from low concentration solution by seed decomposition |
| CN1962448A (en) * | 2006-11-23 | 2007-05-16 | 沈阳铝镁设计研究院 | Two-stage decomposition for producing sand-like alumina product and seed classification process |
| CN101927236A (en) * | 2009-06-24 | 2010-12-29 | 鞍钢集团矿业公司 | Lean hematite technology combining dressing-fine screening and shaking table gravity separation |
Non-Patent Citations (1)
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| 魏建民: "GPS-1400-3型高频振动细筛在二段分级中的应用", 《金属矿山》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110127737A (en) * | 2019-07-01 | 2019-08-16 | 济源职业技术学院 | Kind of the device for dividing periodic thinning is prevented in Bayer process alumina producing |
| CN110127737B (en) * | 2019-07-01 | 2023-09-19 | 济源职业技术学院 | Device for preventing periodic refinement of seed precipitation in Bayer process alumina production |
| CN112456524A (en) * | 2020-12-10 | 2021-03-09 | 沈阳铝镁设计研究院有限公司 | Method for treating fine seeds by using horizontal tilting disk filter |
| CN113620330A (en) * | 2021-09-26 | 2021-11-09 | 沈阳铝镁设计研究院有限公司 | Grading and filtering process for decomposing aluminum hydroxide by two stages |
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| CN105197970B (en) | 2017-02-22 |
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