CN102491387A - Method for eliminating alkali carbonate crystal coarsening phenomenon - Google Patents
Method for eliminating alkali carbonate crystal coarsening phenomenon Download PDFInfo
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- CN102491387A CN102491387A CN2011103778590A CN201110377859A CN102491387A CN 102491387 A CN102491387 A CN 102491387A CN 2011103778590 A CN2011103778590 A CN 2011103778590A CN 201110377859 A CN201110377859 A CN 201110377859A CN 102491387 A CN102491387 A CN 102491387A
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- underflow
- alkali carbonate
- eliminating
- carbonate crystal
- swirler
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Abstract
The invention relates to a method for eliminating an alkali carbonate crystal coarsening phenomenon. The invention relates to an alkali carbonate fishing method used for eliminating the alkali carbonate crystal coarsening phenomenon during a salt-removing process in an aluminum oxide production procedure. The method is characterized in that after a salt-removing process in which evaporation mother liquor is subject to settlement and separation, an obtained underflow is subject to cyclone separation by using a cyclone; a separated underflow is delivered back to a sintering proportioning process; and a separated overflow is delivered back to a settlement and separation tank in the salt-removing process. According to the invention, with the method for eliminating the alkali carbonate crystal coarsening phenomenon, alkali carbonate crystal coarsening and roughening phenomena during the salt-removing process in the aluminum oxide production procedure are effectively solved. Also, the method is advantaged in simple operation, good effect, and feasible technology.
Description
Technical field
A kind of method of eliminating carbon alkali crystallization alligatoring relates to a kind of carbon alkali Refloatation method of alumina producing salt discharge process carbon alkali crystallization alligatoring.
Background technology
Evaporization process vital role is salt discharge in the alumina producing; Its process step comprises: with the underflow of mother liquid evaporation through settlement separate salt discharge process; Adopt swirler-to carry out rotational flow separation again; Isolating underflow returns the sintering process burden process, and the settlement separate groove of salt discharge process is returned in isolating overflow.Its process is to get rid of the process of the impurity that accumulates in the production process after the concentration that mother liquid evaporation is required to accords with production, and it is main that impurity is mainly aqueous carbonic acid sodium, also comprises other salt such as sodium sulfate, S-WAT, is referred to as carbon alkali in the production.Yellow soda ash, sodium sulfate are deleterious in alumina producing, not only fouling on heat-exchange equipment, and stripping, sedimentation etc. also had a negative impact, must it be got rid of as far as possible.
Carbon alkali in the mother liquid evaporation is separated out degree and is not only received Tc, N
kThe influence of concentration also receives carbon alkali and the influence of alkali ratio entirely.The amount of separating out relatively of sodium sulfate wants big than yellow soda ash in the crystallization precipitation process of carbon alkali.Yellow soda ash and sodium sulfate form water-soluble double salt carbonic acid alum 2Na in crystallisation process
2SO
4Na
2CO
3Under the normal situation of crystallization, carbon alkali mainly consist of carbonic acid vanadium and monohydrated sodium carbonate, also be attended by separating out of multi-crystallization water yellow soda ash.Carbonic acid vanadium and yellow soda ash can form sosoloid, and the concentration of sodium sulfate is lower in its balanced solution.
Organism in the sodium aluminate solution, silicon-dioxide, sodium sulfate, cl ions and trace impurity Vanadium Pentoxide in FLAKES influence the crystallization of carbon alkali.Cause the crystallize sodium carbonate sex change; The mechanism of crystallize sodium carbonate sex change is that the above-mentioned various materials that cause the crystallize sodium carbonate sex change influence crystallization and separate out in evaporative process; Cause crystallize sodium carbonate body unusual on physical properties and chemical ingredients, show as the crystallize sodium carbonate sex change of evaporative process.In general the crystallize sodium carbonate sex change has following three kinds of situation: carbon alkali crystallization refinement, carbon alkali crystallization alligatoring, the crystallization of carbon alkali are hardened.
Carbon alkali crystallization sex change alligatoring, sandization (sand carbon alkali particle diameter 0.8～2mm), rotary drum filter and vertical-disk filter can only siphon away filtrating, but can't adsorb the carbon alkali crystallization of alligatoring, sandization, and the carbon alkali in the filter pulp groove is cumulative to be caused filter to be jumped to stop.Production is affected, and the employee work amount significantly increases, and finally can cause flow process to be interrupted.Carbon alkali after the sex change of crystallization sand will in time be got rid of flow process, and anti-blocking alkali circulates in system and causes bigger harm.
Summary of the invention
The object of the invention is exactly the deficiency that exists to above-mentioned prior art, and provide a kind of and can effectively solve alumina producing salt discharge process carbon alkali crystallization alligatoring, sandization, and simple to operate, effective, technology is prone to the method for the elimination carbon alkali crystallization alligatoring of row.
The objective of the invention is to realize through following technical scheme.
A kind of method of eliminating carbon alkali crystallization alligatoring; It is characterized in that its process is with the underflow of mother liquid evaporation through settlement separate salt discharge process; Adopt swirler-to carry out rotational flow separation again, isolating underflow returns the sintering process burden process, and the settlement separate groove of salt discharge process is returned in isolating overflow.
A kind of method of eliminating carbon alkali crystallization alligatoring of the present invention is characterized in that described employing swirler-carries out the underflow of rotational flow separation, enters a dashpot earlier, enters the filter cake groove through dashpot again, returns the sintering process burden process.
A kind of method of eliminating carbon alkali crystallization alligatoring of the present invention efficiently solves alumina producing salt discharge process carbon alkali crystallization alligatoring, sandization, and simple to operate, effective, and technology is prone to row.
Embodiment
A kind of method of eliminating carbon alkali crystallization alligatoring; Its process is with the underflow of mother liquid evaporation through settlement separate salt discharge process; Adopt swirler-to carry out rotational flow separation again, isolating underflow returns the sintering process burden process, and the settlement separate groove of salt discharge process is returned in isolating overflow; Described employing swirler-carries out the underflow of rotational flow separation, enters a dashpot earlier, enters the filter cake groove through dashpot again, returns the sintering process burden process.
Embodiment
1. through increasing camera and remote computer, monitoring underflow situation is according to the operation of underflow situation control subsider and swirler-.
2. increasing the high pressure water flow process before the entering swirler-conveniently scrubs pipeline.
3. before nearly swirler-, increase soda subsider underflow pipe reflux process, convenient flow and pressure to the entering swirler-is adjusted
4. according to the salvaging amount of carbon alkali, select suitable swirler-size, full diameter influences its throughput and separation size usually, and throughput and separation size increase with the increase of its diameter usually.
5. select suitable inlet diameter, overflow diameter and underflow diameter.Strengthening inlet diameter will increase the throughput and the separation size of swirler-, upflow tube is set can reduce short-circuit flow to a certain extent, improve the swirler-separation efficiency and can reduce wearing and tearing.
6. select suitable height and tapering.Simplified height mainly influences its separation size and separation efficiency and plays the current stabilization effect.The swirler-cone angle had both influenced its throughput and separation size, also influenced its separation efficiency.
7. swirler-is applied in carbon alkali salvage to go up main effect is not classification but separates and concentrate, and will be controlled between 0.7～1.0 through production practice underflow liquid-solid ratio.Cyclone inlets pressure is wanted rationally, and the high and low actual effect influence to swirler-of intake pressure is very big.The intake pressure of swirler-will select for use swirler-to import and export meeting wearing and tearing in the use through vaporizer underflow mouth, and especially the underflow mouth should regularly replace, otherwise separation and concentrated effect can be very poor, and the mother liquor waste is very serious..
8. swirler-bottom increase underflow square chest and underflow mouth have certain distance, make things convenient for the collection and the monitoring of underflow.The underflow square chest is inserted the filter cake groove with pipeline.
Being used for mixing convenience with carbon alkali coarse sand through increase hydrojet pipeline carries.
Claims (2)
1. method of eliminating carbon alkali crystallization alligatoring; It is characterized in that its process is with the underflow of mother liquid evaporation through settlement separate salt discharge process; Adopt swirler-to carry out rotational flow separation again, isolating underflow returns the sintering process burden process, and the settlement separate groove of salt discharge process is returned in isolating overflow.
2. a kind of method of eliminating carbon alkali crystallization alligatoring according to claim 1 is characterized in that described employing swirler-carries out the underflow of rotational flow separation, enters a dashpot earlier, enters the filter cake groove through dashpot again, returns the sintering process burden process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103778590A CN102491387A (en) | 2011-11-24 | 2011-11-24 | Method for eliminating alkali carbonate crystal coarsening phenomenon |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103778590A CN102491387A (en) | 2011-11-24 | 2011-11-24 | Method for eliminating alkali carbonate crystal coarsening phenomenon |
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| CN102491387A true CN102491387A (en) | 2012-06-13 |
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| CN2011103778590A Pending CN102491387A (en) | 2011-11-24 | 2011-11-24 | Method for eliminating alkali carbonate crystal coarsening phenomenon |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830027A (en) * | 2017-02-20 | 2017-06-13 | 中国铝业股份有限公司 | A kind of Salt discharge method in Bayer process alumina producing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117226A (en) * | 2007-07-12 | 2008-02-06 | 中国铝业股份有限公司 | Method for expelling carbonate in production of aluminum oxide |
-
2011
- 2011-11-24 CN CN2011103778590A patent/CN102491387A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117226A (en) * | 2007-07-12 | 2008-02-06 | 中国铝业股份有限公司 | Method for expelling carbonate in production of aluminum oxide |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830027A (en) * | 2017-02-20 | 2017-06-13 | 中国铝业股份有限公司 | A kind of Salt discharge method in Bayer process alumina producing |
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Application publication date: 20120613 |