CN112047366A - Method for removing sodium oxalate in alumina decomposition mother liquor by using scabs of decomposition tank - Google Patents
Method for removing sodium oxalate in alumina decomposition mother liquor by using scabs of decomposition tank Download PDFInfo
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- CN112047366A CN112047366A CN202010804426.8A CN202010804426A CN112047366A CN 112047366 A CN112047366 A CN 112047366A CN 202010804426 A CN202010804426 A CN 202010804426A CN 112047366 A CN112047366 A CN 112047366A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
Abstract
The invention particularly relates to a method for removing sodium oxalate in alumina decomposition mother liquor by using a decomposer scab, belonging to the technical field of alumina production; the method for removing sodium oxalate in the alumina decomposition mother liquor by using the scab of the decomposition tank comprises the following steps: grinding scabs of the decomposer to obtain scab particles; and mixing and stirring the scab particles and the decomposition mother liquor to obtain mixed slurry, and finishing the removal of the sodium oxalate. The inventor researches and discovers that the components of the scab of the decomposition tank comprise aluminum hydroxide, sodium oxalate and a small amount of other organic impurities, and the scab can be used as a seed crystal to induce the crystallization and precipitation of the sodium oxalate in the decomposition mother liquor so as to remove the sodium oxalate in the decomposition mother liquor; the average precipitation rate of sodium oxalate in the decomposed mother liquor is 26.69-33.86%, and the maximum precipitation rate of sodium oxalate is 28.46-38.49%, which indicates that the removing rate of sodium oxalate in the decomposed mother liquor is high due to the scab of the decomposition tank.
Description
Technical Field
The invention belongs to the technical field of alumina production, and particularly relates to a method for removing sodium oxalate in alumina decomposition mother liquor by scabbing of a decomposition tank.
Background
In the production of alumina, the comprehensive utilization of imported ore can make the concentration of organic matters in the production flow of alumina quickly rise in a short period, the organic matters are continuously circulated in the production flow of alumina and gradually decomposed into small molecular organic acids such as formic acid, oxalic acid (oxalic acid) and the like, and the small molecular organic acids react with sodium base in the solution to finally generate substances such as sodium carbonate, sodium oxalate and the like.
The existence of sodium oxalate in the production flow of alumina has great harm to the production process. Firstly, the existence of sodium oxalate easily causes the granularity of the decomposition product aluminum hydroxide to be refined, and is not beneficial to the agglomeration of the aluminum hydroxide; secondly, the existence of sodium oxalate leads to the increase of the fragility of an alumina product during roasting, and simultaneously easily causes the over-high content of sodium oxide in the alumina product, thereby influencing the quality of the alumina product; in the production flow of the alumina, the continuous accumulation of the sodium oxalate easily causes the scab of production equipment such as pipelines, filters, tanks and the like, reduces the production efficiency, increases the energy consumption of products, and even causes production accidents.
At present, sodium oxalate in the alumina process is removed by a crystallization method, one method is to reduce the solubility of sodium oxalate in a solution by treating a sodium aluminate solution, so that the sodium oxalate is spontaneously crystallized and separated out, but the method has the problems of fine crystallized sodium oxalate crystal particles, poor crystallinity and high difficulty in solid-liquid separation, so that the method is not applied industrially; another method is to add aluminum hydroxide, sodium oxalate, calcium aluminate and other substances into the sodium aluminate solution as induction seed crystals to crystallize and separate out the sodium oxalate.
Chinese patent CN101302022A discloses a method for removing sodium oxalate by evaporating and concentrating the decomposed mother liquor, cooling, and adding aluminum hydroxide crystal seeds into the solution. However, this method requires evaporative concentration of the decomposition mother liquor, and the process is energy-intensive. Chinese patent CN105800655A discloses a method for precipitating sodium oxalate in sodium aluminate solution by using one or a mixture of sodium oxalate, sodium silica slag, calcium silica slag, aluminum hydroxide, etc. as seed crystal, which can reduce the concentration of sodium oxalate in sodium aluminate solution to below 1 g/L. However, this method also suggests the need for evaporative concentration of the sodium aluminate solution used. In addition, in order to reduce the concentration of sodium oxalate in the sodium aluminate solution, the method described in the patent needs to repeatedly add new seed crystals to the filtrate and perform solid-liquid separation for many times. US3899571 discloses a method for preparing sodium oxalateThe method for removing sodium oxalate from a sodium aluminate solution as a seed crystal has a good effect of removing sodium oxalate, but it also indicates that sodium oxalate is easily inactivated after several cycles. In order to improve the removal rate of sodium oxalate and save the cost of raw materials, the sodium oxalate seed crystal needs to be periodically pickled to activate the inactivated seed crystal. U.S. Pat. No. 5,5888461 discloses a novel alloy containing Al2O3.3CaO.6H2O (ATC6) is used as a seed crystal to remove sodium oxalate in the sodium aluminate solution, the method also achieves better effect, and the ATC6 still has better activity after being cycled for many times, and only the seed crystal needs to be washed when the seed crystal is regenerated. However, the method requires enterprises to produce or purchase ATC6, so the cost of raw materials is high. In addition, the fine particle size of ATC6 and the high amount of liquid attached make it difficult to settle in the slurry, and therefore the difficulty of solid-liquid separation of the slurry is also high.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a method for removing sodium oxalate from an alumina decomposition mother liquor with a decomposer scab, which overcomes or at least partially solves the above problems.
The embodiment of the invention provides a method for removing sodium oxalate in alumina decomposition mother liquor by using a decomposer scab, which comprises the following steps:
grinding scabs of the decomposer to obtain scab particles;
and mixing and stirring the scab particles and the decomposition mother liquor to obtain mixed slurry, and finishing the removal of the sodium oxalate.
Optionally, the decomposer scab comprises the following components in percentage by mass: 20-80% of aluminum hydroxide, 20-80% of sodium oxalate and the balance of impurities.
Optionally, the particle size D of the scar particles is less than or equal to 2 mm.
Optionally, in the decomposition mother liquor, the concentration of caustic alkali is 130-180g/L, the solution molecular ratio is 2.0-3.5, and the concentration of sodium oxalate is more than or equal to 1.0 g/L.
Optionally, the solid content of the ingredients of the scar particles and the decomposition mother liquor is 5-50 g/L.
Preferably, the solid content of the ingredients is 10-50 g/L.
Optionally, the temperature is controlled to be 40-60 ℃ during stirring, and the time is controlled to be 1-50 h.
Preferably, the temperature is 45-50 ℃, and the time is 4-30 h.
Optionally, the method further includes: and carrying out solid-liquid separation on the slurry to obtain separated liquid and separated solid, wherein the separated liquid is used for preparing alumina, and the separated solid is mixed with the scabs of the decomposing tank and then used for removing sodium oxalate.
Optionally, the solid-liquid separation adopts a sedimentation method and/or a filtration method.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the method for removing sodium oxalate in the alumina decomposition mother liquor by using the scab of the decomposition tank, provided by the embodiment of the invention, comprises the following steps: grinding scabs of the decomposer to obtain scab particles; and mixing and stirring the scab particles and the decomposition mother liquor to obtain mixed slurry, and finishing the removal of the sodium oxalate. The inventor researches and discovers that the components of the scab of the decomposition tank comprise aluminum hydroxide, sodium oxalate and a small amount of other organic impurities, and the scab can be used as a seed crystal to induce the crystallization and precipitation of the sodium oxalate in the decomposition mother liquor so as to remove the sodium oxalate in the decomposition mother liquor; the average precipitation rate of sodium oxalate in the decomposed mother liquor can reach 33.86%, the maximum precipitation rate of sodium oxalate can reach 38.49%, and the result shows that the removal rate of sodium oxalate in the decomposed mother liquor is high due to the scab of the decomposition tank.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of the method for removing sodium oxalate from the mother liquor of alumina decomposition by scab of a decomposer according to an embodiment of the present invention;
FIG. 2 is a flow chart of the process for removing sodium oxalate from the mother liquor of alumina decomposition by scab of the decomposer in the embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In the embodiment of the invention, the decomposer scabbing is equivalent to scabbing.
In order to solve the technical problems, the embodiment of the invention has the following general idea:
according to an exemplary embodiment of the present invention, there is provided a method for removing sodium oxalate from an alumina decomposition mother liquor by using a decomposer scab, as shown in fig. 1, the method comprising:
s1, scabbing and grinding the decomposer to obtain scab particles;
and S2, mixing and stirring the scab particles and the decomposition mother liquor to obtain mixed slurry, and finishing the removal of the sodium oxalate.
In this embodiment, the decomposer scabs may be selected from the group consisting of the wall scabs of the decomposer and/or large granular sludge sieved out by a screen of the decomposing process.
In the step S1, the first step,
as some optional embodiments, the decomposer scab comprises the following components in percentage by mass: 20-80% of aluminum hydroxide, 20-80% of sodium oxalate and the balance of impurities.
As some optional embodiments, the particle size D of the scar particles is less than or equal to 2 mm.
The reason for controlling the particle size D of the scab particles to be less than or equal to 2mm is that the scab particles are used as an induction seed crystal and need to have a certain contact area with decomposed mother liquor so as to promote the crystallization of sodium oxalate in the solution.
In the step S2, the first step,
as some optional embodiments, the concentration of caustic alkali in the decomposition mother liquor is 130-180g/L, the solution molecular ratio is 2.0-3.5, and the concentration of sodium oxalate is more than or equal to 1.0 g/L.
The concentration of the caustic alkali in the decomposition mother liquor is controlled to be 130-180g/L and the solution molecular ratio is controlled to be 2.0-3.5, so that different alumina production enterprises can select the optimal caustic alkali concentration and solution molecular ratio suitable for the enterprises by combining with the actual production of the enterprises.
The reason why the concentration of the sodium oxalate in the decomposition mother liquor is controlled to be more than or equal to 1.0g/L is that when the concentration of the sodium oxalate in the decomposition mother liquor is less than 1.0g/L, the sodium oxalate in the decomposition mother liquor does not cause adverse effect on the production of the alumina.
As some optional embodiments, the ingredient content of the scab particles and the decomposition mother liquor is 5-50 g/L.
The solid content of the ingredients is controlled to be 5-50g/L because the removal efficiency of sodium oxalate increases along with the increase of the solid content in a certain solid content range, but when the solid content exceeds 50g/L, the removal efficiency of sodium oxalate by scab is not obviously increased, and the amount of the scab required at the moment is large, so that the requirement is difficult to meet in production; when the solid content of the ingredients is small, the removal efficiency of sodium oxalate is low.
As some preferred embodiments, the ingredient solids content is 10-50 g/L.
As some optional embodiments, in the stirring, the temperature is controlled to be 40-60 ℃, and the time is controlled to be 1-50 h.
The reason for controlling the temperature to be 40-60 ℃ is that the temperature range is closer to the actual production of alumina, the production is easier to realize when the method disclosed by the patent is used for removing the sodium oxalate in the decomposed mother liquor, and the influence on the whole alumina production system can be reduced to the minimum.
The stirring time is controlled to be 1-50h because different alumina production enterprises can adjust the solid content of the ingredients according to the scab amount and the treatment amount of the decomposed mother liquor generated when the enterprises clean the decomposing tank, and properly prolong or shorten the stirring time according to the relationship between the solid content of the ingredients and the removal rate and the removal efficiency of sodium oxalate.
In some preferred embodiments, the temperature is 45 to 50 ℃ and the time is 4 to 30 hours.
As shown in fig. 1, the method further comprises:
and S3, carrying out solid-liquid separation on the slurry to obtain separated liquid and separated solid, wherein the separated liquid is used for preparing alumina, and the separated solid is used for removing sodium oxalate after being mixed with the scabs of the decomposer.
In S3, as some optional embodiments, the solid-liquid separation is performed by a sedimentation method and/or a filtration method.
In this embodiment, the equipment for the sedimentation process may be a settling tank, and the equipment for the filtration process may be a leaf filter or a filter.
The method for removing sodium oxalate from the decomposition mother liquor of alumina by scab in the decomposition tank according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
In the following examples, it is preferred that,
the scab (waste) and the decomposition mother liquor are from the alumina production line of the medium aluminum company;
example 1
1) Raw material treatment: wet grinding the scabs generated in the decomposition process; the decomposition mother liquor was not treated.
Technological parameters and process control: introducing the decomposition mother liquor into a stirring tank; adding the scabs into a stirring tank according to the solid content of the scabs and the decomposed mother liquor as 50g/L, and controlling the temperature of slurry to be 50 ℃ in the stirring process; firstly, quickly stirring the slurry in the stirring tank, and then reducing the stirring speed to continue stirring; taking slurry in the stirring tank at regular intervals during stirring, and measuring sodium oxalate in filtrate after filtering;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 32.09%; the precipitation rate of sodium oxalate is maximum at 37.60% in the 4 th hour of stirring.
Example 2
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: the ingredient solid content of the scab and decomposition mother liquor is adjusted to 20 g/L;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 31.24%; the precipitation rate of sodium oxalate is maximum at 36.35% in the 5 th hour of stirring.
Example 3
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: the ingredient solid content of the scab and decomposition mother liquor is adjusted to 15 g/L;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposition mother liquor is 30.82%; the precipitation rate of sodium oxalate is maximum at the maximum of 34.10 percent when the mixture is stirred for 10 hours.
Example 4
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: adjusting the ingredient solid content of the scab and decomposition mother liquor to 10 g/L;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposition mother liquor is 29.94%; the precipitation rate of sodium oxalate is maximum at the maximum of 31.06 percent when the mixture is stirred for 25 hours.
Example 5
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: adjusting the ingredient solid content of the scab and decomposition mother liquor to 5 g/L;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 26.69%; the precipitation rate of sodium oxalate is maximum at the maximum value of 28.46 percent when the mixture is stirred for 25 hours.
Example 6
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: the temperature of the slurry is controlled to be 45 ℃ in the stirring process;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposition mother liquor is 33.86%; the precipitation rate of sodium oxalate is maximum at 38.49% at the 6 th hour of stirring.
Example 7
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: the procedure was as in example 2. The difference is that the temperature of the slurry is controlled at 45 ℃ in the stirring process;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposition mother liquor is 33.34%; the precipitation rate of sodium oxalate is maximum at 35.12% in the 10 th stirring hour.
Example 8
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: the procedure was as in example 3. The difference is that the temperature of the slurry is controlled at 45 ℃ in the stirring process;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposition mother liquor is 33.11%; the precipitation rate of sodium oxalate is maximum at the maximum of 34.20 percent when the mixture is stirred for 20 hours.
Example 9
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: the procedure was as in example 4. The difference is that the temperature of the slurry is controlled at 45 ℃ in the stirring process;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 31.76%; the sodium oxalate precipitation rate is the maximum at the maximum of 34.88 percent when the mixture is stirred for 25 hours.
Example 10
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: the temperature of the slurry is controlled to be 55 ℃ in the stirring process;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 27.48 percent; the precipitation rate of sodium oxalate is maximum at 33.90% at 10 hours of stirring.
Example 11
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: the procedure was as in example 2. The difference is that the temperature of the slurry is controlled to be 55 ℃ in the stirring process;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 22.88%; the precipitation rate of sodium oxalate is maximum at 27.53% in 15 hours of stirring.
Comparative example 1
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: the ingredient solid content of the scab and decomposition mother liquor is adjusted to 3 g/L;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 17.95%; the precipitation rate of sodium oxalate is maximum at 21.03% after stirring for 35 hours.
Comparative example 2
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: the ingredient solid content of the scab and decomposition mother liquor is adjusted to 60 g/L;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 32.58%; the precipitation rate of sodium oxalate is maximum at 38.22% in the 3 rd hour of stirring.
Comparative example 3
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: the temperature of the slurry is controlled at 30 ℃ in the stirring process;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 48.94%; the precipitation rate of sodium oxalate is maximum at 53.25% in the 5 th hour of stirring.
Comparative example 4
Raw material treatment: the procedure is as in example 1;
technological parameters and process control: this step differs from example 1 in that: the temperature of the slurry is controlled at 70 ℃ in the stirring process;
and (3) measuring results: through determination, under the condition, the average precipitation rate of sodium oxalate in the decomposed mother liquor is 11.21%; the precipitation rate of sodium oxalate is maximum at 13.06% in 15 hours of stirring.
Analysis of measurement results of examples 1 to 11 and comparative examples 1 to 4:
from examples 1 to 11:
the average precipitation rate of the sodium oxalate in the decomposed mother liquor is 26.69-33.86%, and the maximum precipitation rate of the sodium oxalate is 28.46-38.49%, which shows that the method for removing the sodium oxalate by the scab of the decomposition tank provided by the embodiment of the invention can obviously remove the sodium oxalate in the decomposed mother liquor in the production process of alumina.
From the measurement results of comparative examples 1 to 4, it was found that:
in the comparative example 1, the ingredient solid content is smaller than the minimum value of the invention, at this time, the average removal rate of sodium oxalate is lower, and it takes longer time to reach the maximum removal rate, and the final effect is not ideal compared with the invention;
in comparative example 2, the solid content of the ingredients was larger than the maximum value of the present invention, and the average removal rate and removal efficiency of sodium oxalate were comparable to the maximum value of the solid content of the present invention. Under the solid content condition, the amount of scab required is large, so that the applicability in the actual production process is poor;
in comparative example 3, the slurry temperature is lower than the minimum value of the present invention, and the results of the comparative example are better than those of the examples of the present invention only in terms of the sodium oxalate precipitation rate, but the temperature conditions of the comparative example are too low to be suitable for alumina manufacturers;
in comparative example 4, the slurry temperature was higher than the maximum value of the present invention, and the sodium oxalate precipitation rate was lower, and the final effect was much worse than that of the present invention.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
1. according to the method for removing sodium oxalate in the alumina decomposition mother liquor by using the scab of the decomposition tank, the scab generated in the decomposition process is used as the seed crystal to remove the sodium oxalate in the decomposition mother liquor, the scab is cheap waste in alumina production enterprises, and the scab only needs to be simply treated when the scab is used as the seed crystal for recycling. The scab serving as the crystal seed has low raw material cost, can economically and efficiently remove sodium oxalate in decomposed mother liquor, can effectively reduce the sodium oxalate in the production flow of alumina, and weakens the harm to the production of the alumina;
2. the method for removing the sodium oxalate in the alumina decomposition mother liquor by the scab of the decomposition tank provided by the embodiment of the invention has a very simple scab treatment process, and can be used as the seed crystal only by grinding the scab into coarse particles and even simply rolling. When the activity of the seed crystal is reduced in the using process, the seed crystal can be ground or rolled again and then is mixed into new scab materials for continuous use;
3. the method for removing sodium oxalate in the alumina decomposition mother liquor by the scab of the decomposition tank, provided by the embodiment of the invention, has the advantages of changing waste into valuable, simple process, strong operability, easiness in realizing continuous production and good economic benefit.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for removing sodium oxalate in alumina decomposition mother liquor by using a decomposer scab, which is characterized by comprising the following steps:
grinding scabs of the decomposer to obtain scab particles;
and mixing and stirring the scab particles and the decomposition mother liquor to obtain mixed slurry, and finishing the removal of the sodium oxalate.
2. The method for removing sodium oxalate in the alumina decomposition mother liquor by using the scab of the decomposition tank as claimed in claim 1, wherein the scab of the decomposition tank comprises the following components in percentage by mass: 20-80% of aluminum hydroxide, 20-80% of sodium oxalate and the balance of impurities.
3. The method for removing sodium oxalate in the decomposition mother liquor of alumina by scabbing in a decomposition tank as claimed in claim 1, wherein the particle size D of the scab particles is less than or equal to 2 mm.
4. The method as claimed in claim 1, wherein the decomposing mother liquor has a caustic alkali concentration of 130-180g/L, a solution molecular ratio of 2.0-3.5, and a sodium oxalate concentration of 1.0g/L or more.
5. The method for removing sodium oxalate from the decomposition mother liquor of alumina by scabbing in a decomposition tank as claimed in any one of claims 1 to 4, wherein the solid content of the scab particles and the decomposition mother liquor is 5 to 50 g/L.
6. The method for removing sodium oxalate in the decomposition mother liquor of alumina by using the scab of the decomposition tank as claimed in claim 5, wherein the solid content of the ingredients is 10-50 g/L.
7. The method for removing sodium oxalate from aluminum oxide decomposition mother liquor by using decomposer scabs as claimed in claim 1, wherein the temperature is controlled to be 40-60 ℃ and the time is controlled to be 1-50h during stirring.
8. The method for removing sodium oxalate from the decomposition mother liquor of alumina by using the scab of the decomposition tank as claimed in claim 7, wherein the temperature is 45-50 ℃ and the time is 4-30 h.
9. The method for removing sodium oxalate from an alumina decomposition mother liquor by using a decomposer scab as claimed in claim 1, wherein the method further comprises:
and carrying out solid-liquid separation on the slurry to obtain separated liquid and separated solid, wherein the separated liquid is used for preparing alumina, and the separated solid is mixed with the scabs of the decomposing tank and then used for removing sodium oxalate.
10. The method for removing sodium oxalate from the decomposition mother liquor of alumina by scab of a decomposition tank as claimed in claim 9, wherein the solid-liquid separation adopts a sedimentation method and/or a filtration method.
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