CN104692434A - Method for causticizing sodium carbonate solution by using filter cake - Google Patents
Method for causticizing sodium carbonate solution by using filter cake Download PDFInfo
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- CN104692434A CN104692434A CN201510100058.8A CN201510100058A CN104692434A CN 104692434 A CN104692434 A CN 104692434A CN 201510100058 A CN201510100058 A CN 201510100058A CN 104692434 A CN104692434 A CN 104692434A
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- filter cake
- sodium carbonate
- causticization
- aluminum oxide
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Abstract
The invention provides a method for causticizing a sodium carbonate solution by using a filter cake, which comprises the following steps: in a Bayer-method aluminum oxide production process, settling a leaf filter cake to obtain a filter cake slurry; dissolving sodium carbonate to obtain a sodium carbonate solution; mixing the filter cake slurry with the sodium carbonate solution to obtain a mixed slurry; heating the mixed slurry for a preset time period to obtain a mixture containing a sodium aluminate solution and causticizing slag; carrying out filtration treatment on the mixture containing a sodium aluminate solution and causticizing slag to obtain a sodium aluminate solution and causticizing slag; and returning the sodium aluminate solution for producing aluminum oxide. The method can effectively recover aluminum oxide and calcium oxide in the leaf filter cake, lower the lime consumption in the Bayer-method production, lower the production cost of aluminum oxide and enhance the recovery rate of aluminum oxide.
Description
Technical field
The invention belongs to chemical field, specifically, the present invention relates to and utilize filter cake to carry out the method for causticization process to sodium carbonate solution.
Background technology
In the technique of alumina producing Bayer process, the refining filtering of sodium aluminate solution needs to filter with leaf filter, needs the milk of lime adding volume ratio about 0.5% as flocculating aids in filtration procedure.The milk of lime added and sodium aluminate solution water generation reaction and calcium aluminate and calcium aluminosilicate hydrate, the filter cake of filtration is discharged to red mud dump with red mud.The shortcoming of directly draining is exactly the extreme loss causing aluminum oxide and calcium oxide.In addition, Na can be accumulated gradually in Bayer process Production Flow Chart
2cO
3, impact is normally produced, and traditional treatment process improves mother liquid evaporation concentration by opening forcing vaporiser, promotes Na
2cO
3crystal is separated out, by the Na of filtering separation
2cO
3crystal and attached liquid and milk of lime react, and obtain NaOH and turn back to Bayer process production system and prepare burden, causticization slag is directly discharged to red mud dump through red-mud settlement.Traditional treatment method has following shortcoming: 1, the extreme loss causing aluminum oxide and calcium oxide drained by leaf filter filter cake.2, the interpolation of causticization milk of lime causes the loss of aluminum oxide and the raising of production cost.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is that proposing a kind of efficient, energy-conservation filter cake that utilizes carries out the method for causticization process to sodium carbonate solution.
According to an aspect of the present invention, the present invention proposes a kind of filter cake that utilizes and the method for causticization process carried out to sodium carbonate, comprising:
In alumina producing Bayer process process, leaf filter cake is carried out sedimentation, to obtain filter cake slurries;
Described sodium carbonate is dissolved, to obtain sodium carbonate solution;
Described filter cake slurries are mixed with described sodium carbonate solution, to obtain mixed serum;
Described mixed serum is carried out heat treated and stops the scheduled time, to obtain the mixture containing sodium aluminate solution and causticization slag;
The described mixture containing sodium aluminate solution and causticization slag is carried out filtration treatment, to obtain sodium aluminate solution and causticization slag; And
Described sodium aluminate solution is returned for the production of aluminum oxide.
Thus, the method for the above embodiment of the present invention, make use of leaf filter filter cake dexterously and substitutes the causticization that milk of lime carries out sodium carbonate solution, reduce the consumption of lime in Bayer process production.Composition simultaneously in filter cake and sodium carbonate react and generate sodium aluminate solution and causticization slag, and then reach the object reclaiming aluminum oxide and calcium oxide in leaf filter filter cake.Therefore, utilize the method effectively can reduce the consumption of lime, eliminate the process to filter cake, reclaimed the aluminum oxide in discarded filter cake and calcium oxide simultaneously, and then reduced the production cost of aluminum oxide.Therefore, the method for the above embodiment of the present invention environmental protection more, energy-conservation, greening.
In addition, the filter cake that utilizes according to the above embodiment of the present invention can also have following additional technical characteristic to the method that sodium carbonate carries out causticization process:
In some embodiments of the invention, described filter cake includes at least one in aluminum oxide, calcium oxide, calcium aluminate.
In some embodiments of the invention, the solids concn in described filter cake slurries is 250-350g/L.
In some embodiments of the invention, the concentration of described sodium carbonate solution is 100-150g/L.
In some embodiments of the invention, the liquid-solid mass ratio of described mixed serum is 10.
In some embodiments of the invention, the temperature of described heat treated is 80-100 degree Celsius.Causticizing efficiency can be improved further thus.
In some embodiments of the invention, the described stop scheduled time is 0.5-2 hour.Causticization effect can be improved further thus.
In some embodiments of the invention, in described leaf filter filter cake, the rate of recovery of aluminum oxide is 75-85%, and the rate of recovery of described calcium oxide is 90-98%.
Accompanying drawing explanation
Fig. 1 is that the filter cake that utilizes implementing the embodiment of the present invention carries out the equipment drawing of the method for causticization process to sodium carbonate.
Embodiment
According to an aspect of the present invention, the present invention proposes a kind of filter cake that utilizes and the method for causticization process is carried out to sodium carbonate.According to a particular embodiment of the invention, the method comprises: in alumina producing Bayer process process, and leaf filter cake is carried out sedimentation, to obtain filter cake slurries; Sodium carbonate is dissolved, to obtain sodium carbonate solution; Described filter cake slurries are mixed with described sodium carbonate solution, to obtain mixed serum; Described mixed serum is carried out heat treated and stops the scheduled time, to obtain the mixture containing sodium aluminate solution and causticization slag; The described mixture containing sodium aluminate solution and causticization slag is carried out filtration treatment, to obtain sodium aluminate solution and causticization slag; And described sodium aluminate solution is returned for the production of aluminum oxide.
Thus, the method for the above embodiment of the present invention, make use of leaf filter filter cake dexterously and substitutes the causticization that milk of lime carries out sodium carbonate solution, reduce the consumption of lime in Bayer process production.Composition simultaneously in filter cake and sodium carbonate react and generate sodium aluminate solution and causticization slag, and then reach the object reclaiming aluminum oxide and calcium oxide in leaf filter filter cake.Therefore, utilize the method effectively can reduce the consumption of lime, eliminate the process to filter cake, reclaimed the aluminum oxide in discarded filter cake and calcium oxide simultaneously, and then reduced the production cost of aluminum oxide.Therefore, the method for the above embodiment of the present invention environmental protection more, energy-conservation, greening.
According to a particular embodiment of the invention, above-mentioned filter cake is in alumina producing Bayer process process, enters to add milk of lime as in the capable refining filtering process of flocculating aids to sodium aluminate solution, and reaction produces, and usually can be discharged to red mud dump with red mud.But also containing aluminum oxide, calcium oxide, calcium aluminate, silicon-dioxide, sodium oxide etc. in filter cake, therefore, directly drain the extreme loss that can cause aluminum oxide and calcium oxide.The present invention is by mixing filter cake with a large amount of sodium carbonate produced in production alumina process, aluminum oxide in filter cake and calcium oxide can be obtained by reacting sodium aluminate and calcium carbonate with sodium carbonate respectively, sodium aluminate can return for the production of aluminum oxide again thus, not only avoid the waste of aluminum oxide, add the output of aluminum oxide simultaneously.
According to a particular embodiment of the invention, in order to fully reclaim aluminium in filter cake and calcium, carry out causticization effectively to sodium carbonate, the present inventor is optimized by the reaction conditions of the two simultaneously.According to a particular embodiment of the invention, first need the concentration controlling filter cake slurries and sodium carbonate solution, according to concrete example of the present invention, contriver finds, needs the solids concn controlled in filter cake slurries to be 250-350g/L, is preferably 300g/L.The concentration simultaneously controlling sodium carbonate solution is 100-150g/L.And the two is mixed, the proportioning of mixing can calculate according to the liquid-solid mass ratio of final mixed serum, and particularly, the liquid-solid mass ratio of mixed serum needs control to be 10.Thus the filter cake slurries and sodium carbonate solution with above-mentioned concentration are carried out mixing causticization, and the aluminum oxide reclaimed fully in filter cake slurries and calcium oxide, reach the object of sodium carbonate being carried out to causticization simultaneously, eliminate and additionally add large quantities of lime.Contriver finds, liquid-solid mass ratio is controlled to 10, leaf can be made to filter calcium aluminosilicate hydrate in filter cake and sodium carbonate can complete reaction, if leaf filter filter cake is excessive, causticizing efficiency is high, but the recovery utilization rate of aluminum oxide and calcium oxide is low, otherwise, if sodium carbonate is excessive, so the recovery utilization rate of aluminum oxide and calcium oxide is high, but causticizing efficiency is low.Causticizing efficiency refers to the ratio of sodium carbonate total in the sodium carbonate and solution reacted away.
In addition, carry out heat treated further to mixed serum obtained above, according to concrete example of the present invention, the temperature of heat treated can be 80-100 degree Celsius.Reaction efficiency can be improved further thus, abundant causticization is carried out to sodium carbonate.After being heated to said temperature further, needing to stop the scheduled time, reaction can be made thus further to carry out completely, abundant causticization.Particularly, the residence time should control at 0.5-2 hour.According to a particular embodiment of the invention, by controlling above-mentioned reaction conditions, good reaction environment can be provided for aluminum oxide, calcium oxide in sodium carbonate and filter cake, and then improve its reaction efficiency and productive rate, realize the effective causticization to sodium carbonate, save the interpolation of milk of lime, provide cost savings.
According to a particular embodiment of the invention, reach 75-85% by the rate of recovery adopting the method for the above embodiment of the present invention that leaf can be made to filter aluminum oxide in filter cake, the rate of recovery of calcium oxide reaches 90-98%.Therefore, adopt the method for the above embodiment of the present invention significantly can reduce the loss of aluminum oxide and calcium oxide, improve the productive rate producing aluminum oxide, reduce costs.
According to a particular embodiment of the invention, the reaction of above-mentioned two kinds of slurries can be carried out in causticizing tank, and then can reach above-mentioned reaction conditions better.According to a particular embodiment of the invention, as shown in Figure 1, filter cake slurries can prepare suitable concentration by leaf filter cake groove, sodium carbonate solution can be obtained by the preparation of salt dissolving tank, further two kinds of slurries are transferred in causticizing tank and carry out mixing and obtain suitable liquid-solid ratio, regulate causticizing tank temperature and stop reaction certain hour.Thus, the method for the above embodiment of the present invention, technique is simple, easily implements, Be very effective.
Embodiment
As shown in Figure 1, by filter cakes of leaf filter through sedimentation concentration to admittedly containing about 300g/L, by salt filter cake with hot water dissolving, obtain the sodium carbonate solution that concentration is 110g/L, the filter cake slurries of 1L are got in causticizing tank with the sodium carbonate solution of 2L and fully mixes, adjustment mixed slurry liquid-solid ratio is about 10, by steam heating to 95 DEG C, stop 1 hour, abundant causticization, by slip solid-liquor separation after causticization, causticization slag (calcium carbonate) is sent to red mud dump through sedimentation, and causticization liquid (sodium aluminate) is for Allocating Circle mother liquor.
Conclusion: reclaim aluminum oxide 57g, the rate of recovery reaches 81%; Reclaim calcium oxide 104g, the rate of recovery reaches 91%; Causticizing efficiency reaches 91%; The sodium carbonate solution 2L causticizing efficiency 91% of 110g/L, needs the milk of lime 0.6L of the effective calcium of 180g/L, so process 1L sodium carbonate solution, saves the milk of lime 0.3L of the effective calcium of effective calcium 180g/L.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term need not for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (8)
1. utilize filter cake to carry out a method for causticization process to sodium carbonate, it is characterized in that, comprising:
In alumina producing Bayer process process, leaf filter cake is carried out sedimentation, to obtain filter cake slurries;
Described sodium carbonate is dissolved, to obtain sodium carbonate solution;
Described filter cake slurries are mixed with described sodium carbonate solution, to obtain mixed serum;
Described mixed serum is carried out heat treated and stops the scheduled time, to obtain the mixture containing sodium aluminate solution and causticization slag;
The described mixture containing sodium aluminate solution and causticization slag is carried out filtration treatment, to obtain sodium aluminate solution and causticization slag; And
Described sodium aluminate solution is returned for the production of aluminum oxide.
2. utilize filter cake to carry out the method for causticization process to sodium carbonate according to claim 1, it is characterized in that, described filter cake includes at least one in aluminum oxide, calcium oxide, calcium aluminate.
3. according to claim 1 or 2, utilize filter cake to carry out the method for causticization process to sodium carbonate, it is characterized in that, the solids concn in described filter cake slurries is 250-350g/L.
4. according to any one of claim 1-3, utilize filter cake to carry out the method for causticization process to sodium carbonate, it is characterized in that, the concentration of described sodium carbonate solution is 100-150g/L.
5. according to any one of claim 1-4, utilize filter cake to carry out the method for causticization process to sodium carbonate, it is characterized in that, the liquid-solid mass ratio of described mixed serum is 10.
6. according to any one of claim 1-5, utilize filter cake to carry out the method for causticization process to sodium carbonate, it is characterized in that, the temperature of described heat treated is 80-100 degree Celsius.
7. according to any one of claim 1-6, utilize filter cake to carry out the method for causticization process to sodium carbonate, it is characterized in that, the described stop scheduled time is 0.5-2 hour.
8. according to any one of claim 1-7, utilize filter cake to carry out the method for causticization process to sodium carbonate, it is characterized in that, in described leaf filter filter cake, the rate of recovery of aluminum oxide is 75-85%, and the rate of recovery of described calcium oxide is 90-98%.
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| CN201510100058.8A CN104692434A (en) | 2015-03-06 | 2015-03-06 | Method for causticizing sodium carbonate solution by using filter cake |
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| CN201510100058.8A CN104692434A (en) | 2015-03-06 | 2015-03-06 | Method for causticizing sodium carbonate solution by using filter cake |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565349A (en) * | 2016-01-19 | 2016-05-11 | 中国铝业股份有限公司 | Recycling method for leaf filter residues in aluminum oxide production |
| CN107235500A (en) * | 2017-06-28 | 2017-10-10 | 茌平信发华宇氧化铝有限公司 | The processing system and processing method of filter cakes of leaf filter in a kind of alumina producing |
| CN108569716A (en) * | 2017-03-08 | 2018-09-25 | 河南海纳天城科技有限公司 | A kind of method of crude liquor of sodium aluminate refining filtering |
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| CN101746799A (en) * | 2008-12-09 | 2010-06-23 | 沈阳铝镁设计研究院 | Method and system for utilizing filter cake in fine filtration of sodium aluminate solution |
| CN101870545A (en) * | 2010-06-10 | 2010-10-27 | 中国铝业股份有限公司 | Method for treating filter cakes of leaf filter |
| CN102732662A (en) * | 2012-06-02 | 2012-10-17 | 胡长春 | Slag-free production process using bauxite or red mud |
| CN103058237A (en) * | 2011-10-22 | 2013-04-24 | 中国铝业股份有限公司 | Causticizing and desulphurizing method for evaporation crystallization alkali in aluminum oxide production |
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Patent Citations (4)
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| CN101746799A (en) * | 2008-12-09 | 2010-06-23 | 沈阳铝镁设计研究院 | Method and system for utilizing filter cake in fine filtration of sodium aluminate solution |
| CN101870545A (en) * | 2010-06-10 | 2010-10-27 | 中国铝业股份有限公司 | Method for treating filter cakes of leaf filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565349A (en) * | 2016-01-19 | 2016-05-11 | 中国铝业股份有限公司 | Recycling method for leaf filter residues in aluminum oxide production |
| CN108569716A (en) * | 2017-03-08 | 2018-09-25 | 河南海纳天城科技有限公司 | A kind of method of crude liquor of sodium aluminate refining filtering |
| CN107235500A (en) * | 2017-06-28 | 2017-10-10 | 茌平信发华宇氧化铝有限公司 | The processing system and processing method of filter cakes of leaf filter in a kind of alumina producing |
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Application publication date: 20150610 |