CN101691233B - System and process for decomposing crystal seed of aluminum hydroxide - Google Patents
System and process for decomposing crystal seed of aluminum hydroxide Download PDFInfo
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- CN101691233B CN101691233B CN200910210135XA CN200910210135A CN101691233B CN 101691233 B CN101691233 B CN 101691233B CN 200910210135X A CN200910210135X A CN 200910210135XA CN 200910210135 A CN200910210135 A CN 200910210135A CN 101691233 B CN101691233 B CN 101691233B
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Abstract
The invention relates to a system and a process for decomposing a crystal seed of aluminum hydroxide during the production of aluminum oxide. The crystal seed decomposing system comprises a decomposing tank, a vertical disc filtering machine, a spiral slurry-decomposing machine and a sliding chute, wherein the vertical disc filtering machine is arranged at a position close to the first tank of the decomposing tank and can filter feed slurry from the last tank of the decomposing tank; a filter cake is mixed with supersaturated solution of sodium aluminate to form the feed slurry of the crystal seed by using the spiral slurry-decomposing machine arranged between the vertical disc filtering machine and the first tank of the decomposing tank; the feed slurry of the crystal seed enters the first tank of the decomposing tank by the sliding chute and then orderly enters all decomposing tanks till the last tank of the decomposing tank for step-to-step crystallation and growth; and the feed slurry in the last tank of the decomposing tank is pumped in the vertical disc filtering machine by a feeding pump of the vertical disc filtering machine and filtered. By using the process, a crystal seed tank and a stirring step thereof, a crystal seed pump and pipes thereof, an overflow tank and a stirring step thereof and an overflow pump are saved, the problem of the scab of the crystal seed is solved, and equipment cost and power consumption are reduced.
Description
Technical field
The present invention relates to process for making alumina, specifically, relate to aluminium hydroxide crystal seed decomposition technique and system.
Background technology
In utilizing the traditional technology of alumina producing Bayer process, the decomposition of sodium aluminate solution is one of important procedure, being commonly referred to as the decomposition of crystal seed operation, is a large amount of crystal seed to be added decomposer carry out the induced crystallization of aluminum hydroxide crystals and grow up, and oversaturated sodium aluminate solution is decomposed.The aluminium hydroxide finished product of growing up separates by grading machine, is sent to sintering circuit, the preparation aluminum oxide; The slurry filtration of decomposer end groove, filter cake uses as crystal seed.
In traditional decomposition of crystal seed operation, the processing set-up great majority are that vertical-disk filter 2 ' is placed near decomposer 1 ' the last groove, and height is about 18 meters.The filter cake of output is directly fallen in the seed mixer 3 ' of below, with after oversaturated sodium aluminate solution mixes, toward the first groove of decomposer, pass through the decomposition step by step of each decomposer then as crystal seed by the crystal seed pumping, finished product aluminium hydroxide will branch away by grading machine, deliver to the square position; The slip that comes out from decomposer end groove enters the vertical-disk filter filtration, and the filter cake that filters out recycles as crystal seed; Filtrate enters taper mother liquor tank 4 ', is sent to the evaporation former liquid bath of taper (general flow chart is seen Fig. 1) through flat mother liquor tank 5 '.
Owing to oversaturated sodium aluminate solution runs into crystal seed in seed mixer after, decomposition reaction will take place, very easily cause scabbing of seed mixer, even stop up the cell wall valve.Therefore, in operational process at ordinary times, need often switch the seed mixer cleaning and scab, the cycle 2-3 month (because of bauxite character different).And its crystal seed slip also can react in pipeline and scab in crystal seed pump delivery process, so general crystal seed pipe all adopts flange to connect, so that safeguard cleaning.But annual in order to change crystal seed pipeline aged flange gasket, lot of manpower and material resources need come into operation.
Owing to adopt last groove middle part,, must behind last groove, be equipped with a buffering decomposer simultaneously, be used for satisfying the charging liquid level of last groove for continuity and the stability that guarantees to produce to the vertical-disk filter punishment in advance.For preventing to cushion the decomposer jetsam, need to be equipped with a partial circulating pump, allow its slip self circulate.
For overcoming above-mentioned shortcoming, the present invention proposes a kind of decomposition of crystal seed technology that is used for alumina producing, cancelled the input of seed mixer, crystal seed pipeline, partial circulating pump, eradicated fully that seed mixer scabs, crystal seed pipe flange aged problem, both reduce front-end investment, reached the purpose of energy-saving consumption-reducing again.
Summary of the invention
The purpose of this invention is to provide aluminium hydroxide crystal seed decomposing system and technology in a kind of alumina producing.
Decomposition of crystal seed of the present invention system comprises:
Decomposer: some decomposers interconnect successively, are used for the crystallization step by step of aluminium hydroxide and grow up; The number of decomposer determines that according to processing requirement what be positioned at the first place is first groove, is positioned at the last groove at end, and the previous decomposer of last groove is decomposer end two grooves;
Vertical-disk filter: the slurry filtration of the groove of self-decomposition in the future end groove is set in the position near the first groove of decomposer;
Spiral slurry dissolving device: be arranged between the first groove of vertical-disk filter and decomposer, the filter cake and the oversaturated sodium aluminate solution of vertical-disk filter is mixed into the crystal seed slip;
Chute: connect the first groove of spiral slurry dissolving device and decomposer, the crystal seed slip is introduced the first groove of decomposer.
Described system also comprises the former liquid bath of taper, is used to collect the filtering filtrate of vertical-disk filter.Described system also comprises flat former liquid bath, and is consistent with traditional technology, the former liquid bath logotype of flat former liquid bath and taper, and the supernatant liquid overflow of the former liquid bath of taper is to flat former liquid bath.
In the traditional technology, comprise taper mother liquor tank, flat mother liquor tank, the former liquid bath in the taper former liquid bath peace end.The mother liquor that obtains after the filtration at first passes through the taper mother liquor tank, with mother liquor floating material agglomeration enrichment, from the mother liquor floating material of taper mother liquor tank discharge section; The overflow of taper mother liquor tank supernatant liquid is to flat mother liquor tank; By the mother liquor pump mother liquor is sent to plate-type heat exchanger from flat mother liquor tank and heats up, the mother liquor after the intensification arrives the former liquid bath of taper again, and with the further agglomeration enrichment of mother liquor floating material, the overflow of the former liquid bath supernatant liquid of taper is to flat former liquid bath; By concentrate pump mother liquor is sent to evaporator station at last.The present invention only adopts the former liquid bath in the taper former liquid bath peace end, realize the function of taper mother liquor tank in the traditional technology, flat mother liquor tank, the former liquid bath in the taper former liquid bath peace end, realize that the groove jar is shared, cancelled the material-handling pump of mother liquor tank, reduced investment and working cost to former liquid bath.
Described system also comprises the vertical-disk filter feeding pump, is used for the slip of decomposer end groove is pumped into vertical-disk filter.
Described system also comprises grading machine, is used for the aluminum hydroxide crystals separation with the slip of decomposer end two grooves.
Be generally and guarantee technology continuity and easy access, first groove of decomposer and last groove all can be set to 1-5, preferred 2-3,
Decomposition of crystal seed technology of the present invention may further comprise the steps successively:
S1: the mixed slurry of supersaturated sodium aluminate solution and crystal seed enters the first groove of decomposer, the crystallization and the growth process of beginning aluminum hydroxide crystals;
S2: the slip of the first groove of decomposer enters decomposer subsequently, carries out crystallization step by step and growth process, until arriving decomposer end groove;
S3: the slip of decomposer end groove enters near the vertical-disk filter that is arranged on the first groove of decomposer by the vertical-disk filter feeding pump and filters, and obtains filter cake and filtrate;
S4: utilize the spiral slurry dissolving device that filter cake and supersaturated sodium aluminate solution are mixed into the crystal seed mixed slurry;
S5: utilize chute, the crystal seed mixed slurry is introduced the first groove of decomposer.
Above-mentioned steps circulation is carried out, with filter cake as the crystal seed recycle.
In step S2, also comprise the classified machine of slip in two grooves of decomposer end is separated, collect the suitable aluminium hydroxide of granularity, and be sent to sintering circuit.
Grading machine carries out at decomposer end two grooves, promptly uses on the previous decomposer of decomposer end groove, and if any 14 decomposers, when the 14# decomposer was last groove, the 13# decomposer was given the grading machine feed; If the maintenance of 13# decomposer, then the 12# decomposer is given the grading machine feed.If the maintenance of 14# decomposer, then 13# is that decomposer is last groove, and then the 12# decomposer is given the grading machine feed.If so 14 decomposers are arranged, then 12# decomposer and 13# decomposer can be given the grading machine feed.
After S3, technology of the present invention also comprises S4 ': filtrate is introduced the former liquid bath of taper.
Compare with existing technology, utilize system of the present invention and technology to have following outstanding advantage: 1) to adopt the chute charging, the overflow of vertical-disk filter is directly inserted the charging chute, cancellation seed mixer and stirring, crystal seed pump and pipeline, overflow groove and stirring thereof, overflow type pump, though increased the vertical-disk filter feeding pump, but last tank liquor face and first tank liquor face difference are poor less than the liquid level of traditional seed mixer and first groove, therefore power consumption is littler than the crystal seed pump in the traditional technology, thereby has reduced investment and power consumption.
2) replace taper mother liquor tank and flat mother liquor tank with the former liquid bath in the taper former liquid bath peace end, realize that the groove jar is shared, cancelled the material-handling pump of mother liquor tank, reduced investment and working cost to former liquid bath.
3) owing to be, therefore do not have special requirement, do not need to be equipped with buffering decomposer and supporting partial circulating pump for liquid level from last trench bottom toward the vertical-disk filter charging.Investment and power consumption have further been reduced.
Description of drawings
Fig. 1 is the schematic flow sheet of traditional decomposition of crystal seed technology;
Fig. 2 is the schematic flow sheet of decomposition of crystal seed technology of the present invention.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
Decomposition of crystal seed of the present invention system, adopt following equipment: 14 decomposers 1, decomposer interconnects successively, is used for the crystallization step by step of aluminium hydroxide and grows up, and the first groove of decomposer is positioned at the below of vertical-disk filter;
2 vertical-disk filters 2, about 51 meters of mounting heights are filtered the slip from decomposer end groove;
2 spiral slurry dissolving devices 5 are arranged between the first groove of vertical-disk filter and decomposer, and the filter cake (being crystal seed) and the oversaturated sodium aluminate solution of vertical-disk filter is mixed into the crystal seed slip; The crystal seed slip flows to the first groove of decomposer certainly through chute; Then slip successively at each decomposer through decomposing step by step, until arriving decomposer end groove, finished product aluminium hydroxide will branch away by grading machine, deliver to the square position, the slip of decomposer end groove enters vertical-disk filter by the vertical-disk filter feeding pump of last trench bottom by pipeline.The filter cake that filters out recycles as crystal seed; Filtrate enters the former liquid bath 3 of taper as vaporizing raw liquor (general flow chart is seen accompanying drawing 2).So circulation is carried out.
Because decomposition reaction is the most violent at first groove, and first cell body is long-pending maximum, and it is bigger load, breaks down easily, is the continuity that guarantees technology, therefore be provided with 3 standby each other,, the last groove relative load of decomposer is less, be provided with 2 standby each other.
Utilize this technology, though increased the vertical-disk filter feeding pump, but last tank liquor face and first tank liquor face difference are poor less than the liquid level of traditional seed mixer and first groove, therefore power consumption is littler than the crystal seed pump in the traditional technology, also cancels seed mixer and stirring thereof, crystal seed pump and pipeline, overflow groove and stirring thereof, overflow type pump; And, therefore do not have special requirement for liquid level owing to be from last trench bottom toward the vertical-disk filter charging, do not need to be equipped with buffering decomposer and supporting partial circulating pump.Investment and power consumption have further been reduced.
Claims (7)
1. aluminium hydroxide crystal seed decomposing system comprises:
Decomposer: some decomposers interconnect successively, are used for the crystallization step by step of aluminium hydroxide and grow up;
Vertical-disk filter: the slurry filtration of the groove of self-decomposition in the future end groove is set in the position near the first groove of decomposer;
Spiral slurry dissolving device: be arranged between the first groove of vertical-disk filter and decomposer, the filter cake and the oversaturated sodium aluminate solution of vertical-disk filter is mixed into the crystal seed slip;
Chute: connect the first groove of spiral slurry dissolving device and decomposer, the crystal seed slip is introduced the first groove of decomposer
Vertical-disk filter feeding pump: be used for the slip of decomposer end groove is pumped into vertical-disk filter.
2. the system as claimed in claim 1 is characterized in that, described system also comprises the former liquid bath in the taper former liquid bath peace end, and the former liquid bath of taper is used to collect the filtering filtrate of vertical-disk filter; The former liquid bath logotype of flat former liquid bath and taper, the supernatant liquid overflow of the former liquid bath of taper is to flat former liquid bath.
3. system as claimed in claim 1 or 2 is characterized in that described system also comprises grading machine, is used for the aluminum hydroxide crystals separation with the slip of decomposer end two grooves.
4. an aluminium hydroxide crystal seed decomposition technique is characterized in that, may further comprise the steps successively:
S1: the mixed slurry of supersaturated sodium aluminate solution and crystal seed enters the first groove of decomposer, the crystallization and the growth process of beginning aluminum hydroxide crystals;
S2: the slip of the first groove of decomposer enters decomposer subsequently, carries out crystallization step by step and growth process, until arriving decomposer end groove;
S3: the slip of decomposer end groove enters near the vertical-disk filter that is arranged on the first groove of decomposer by the vertical-disk filter feeding pump and filters, and obtains filter cake and filtrate;
S4: utilize the spiral slurry dissolving device that filter cake and supersaturated sodium aluminate solution are mixed into the crystal seed mixed slurry;
S5: utilize chute, the crystal seed mixed slurry is introduced the first groove of decomposer.
5. technology as claimed in claim 4 is characterized in that, from S1 to S5, the circulation of each steps in sequence is carried out, with filter cake as the crystal seed recycle.
6. as claim 4 or 5 described technologies, it is characterized in that, in step S2, also comprise the classified machine of slip in two grooves of decomposer end is separated, collect the suitable aluminium hydroxide of granularity, and be sent to sintering circuit.
7. technology as claimed in claim 6 is characterized in that, the filtrate that step S3 obtains is introduced the former liquid bath of taper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910210135XA CN101691233B (en) | 2009-10-27 | 2009-10-27 | System and process for decomposing crystal seed of aluminum hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910210135XA CN101691233B (en) | 2009-10-27 | 2009-10-27 | System and process for decomposing crystal seed of aluminum hydroxide |
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| Publication Number | Publication Date |
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| CN101691233A CN101691233A (en) | 2010-04-07 |
| CN101691233B true CN101691233B (en) | 2011-06-15 |
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| CN200910210135XA Expired - Fee Related CN101691233B (en) | 2009-10-27 | 2009-10-27 | System and process for decomposing crystal seed of aluminum hydroxide |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531005B (en) * | 2010-12-21 | 2014-05-07 | 贵阳铝镁设计研究院有限公司 | Method and device for discharging coarse granule slurry in decomposition production process of aluminum oxide |
| CN102515226B (en) * | 2011-12-22 | 2014-08-06 | 东北大学设计研究院（有限公司） | Decomposition and filtration method during alumina production process |
| CN103736317A (en) * | 2013-12-14 | 2014-04-23 | 中国铝业股份有限公司 | Material feeding method for seed precipitation filter |
| CN104709930B (en) * | 2013-12-17 | 2016-05-18 | 贵阳铝镁设计研究院有限公司 | A kind of method and interface structure that improves the evaporation equipment detecting instrument life-span |
| CN107746067B (en) * | 2017-11-13 | 2019-04-12 | 中国铝业股份有限公司 | A kind of vertical plate discharging decomposer slurry self-circulating device and its operating method |
| CN108609641A (en) * | 2018-07-09 | 2018-10-02 | 中铝集团山西交口兴华科技股份有限公司 | A kind of production system and its production technology producing low sodium alumina using low-grade bauxite |
| CN109592700B (en) * | 2018-12-18 | 2021-07-13 | 广西华银铝业有限公司 | Method for continuously operating decomposition and grading production of alumina plant |
| CN112047365A (en) * | 2020-09-08 | 2020-12-08 | 山西复晟铝业有限公司 | Bayer process multi-variety aluminum oxide production system |
| CN112028096A (en) * | 2020-10-12 | 2020-12-04 | 山西复晟铝业有限公司 | Connecting system for reducing liquid content of seed crystal filter cake and control method |
| CN113788488B (en) * | 2021-11-02 | 2023-07-04 | 中国铝业股份有限公司 | Ultralow-sodium aluminum hydroxide and preparation method thereof |
| CN114130324A (en) * | 2021-12-01 | 2022-03-04 | 沈阳铝镁设计研究院有限公司 | Flood absorption synergistic decomposition system |
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Effective date of registration: 20180827 Address after: 472100 Henan Sanmenxia West Industrial Park Cayman aluminum (Sanmenxia) Co., Ltd. Patentee after: Cayman aluminium (Sanmenxia) Co., Ltd. Address before: 310005 20-22 building, Jinjiang tower, 111 Hu Shu Nan Road, Hangzhou, Zhejiang. Patentee before: Hangzhou Jinjiang Group Co., Ltd. |
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Granted publication date: 20110615 Termination date: 20201027 |