CN113788488A - Ultralow-sodium aluminum hydroxide and preparation method thereof - Google Patents
Ultralow-sodium aluminum hydroxide and preparation method thereof Download PDFInfo
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Abstract
The invention particularly relates to ultra-low sodium aluminum hydroxide and a preparation method thereof, belonging to the technical field of aluminum hydroxide preparationkThe temperature of the first tank is regulated, the supersaturation degree of the sodium aluminate solution in the first tank is properly reduced, the temperature of the first tank is more easily controlled accurately, and then Na is produced according to the existing decomposition process2An ultra-low sodium aluminum hydroxide product having an O content of 0.05-0.08%.
Description
Technical Field
The invention belongs to the technical field of aluminum hydroxide preparation, and particularly relates to ultra-low-sodium aluminum hydroxide and a preparation method thereof.
Background
Sodium oxide is used as a main impurity of alumina, the content of the sodium oxide is one of important technical indexes of alumina grade, the lower content of the sodium oxide is not only required for aluminum smelting, the lower the content of the sodium oxide of the alumina is, the less aluminum fluoride is consumed in the aluminum electrolysis process, and the low-sodium alumina has wide application in the aspects of ceramics and insulating materials.
The method for producing the low-sodium alumina generally comprises the following steps: (1) industrial aluminium hydroxide rapidly passes through a region with the temperature of about 430 ℃ in one hour, and is treated by distilled water with the temperature of about 30 ℃ or desalted water with the temperature of about 50 ℃, so that the alkali content can be reduced to 0.023% or 0.015% respectively; (2) patent CN110642281A, a method for preparing alpha-phase superfine low-sodium alumina powder by mixing industrial oxyhydrogenGrinding aluminum oxide, adding a sodium removing agent, reacting under the action of ultrasonic waves, and cleaning with deionized water to obtain aluminum hydroxide fine powder; (3) patent CN102020302A, a method for reducing sodium content in aluminum hydroxide, is to make industrial aluminum hydroxide undergo hydrothermal phase inversion to boehmite; (4) patent CN101746796B, a method for preparing low-sodium aluminum hydroxide by decomposing sodium aluminate solution, which adopts partial refined solution to perform seed crystal decomposition, and fully washes a part of fine-grained aluminum hydroxide obtained by classification as low-sodium aluminum hydroxide; (5) patent CN108751242A, a low-sodium alumina decomposition process and low-sodium alumina, wherein the temperature of a decomposition first tank and the alpha of a refined liquid are improved by adjusting the solid content of the first tankkSignificantly reduces the lattice base in the aluminum hydroxide, and leads the Na in the finally prepared aluminum oxide2The content of O is reduced and stabilized to be below 0.25 percent, which is greatly lower than 0.5 percent specified by the national standard. The method is not complex in process, or the sodium reduction effect is not ideal enough.
Disclosure of Invention
The application aims to provide the ultra-low-sodium aluminum hydroxide and the preparation method thereof, so as to solve the technical problem that the prior art is difficult to achieve the effects of simple process and sodium reduction.
The embodiment of the invention provides a preparation method of ultralow-sodium aluminum hydroxide, which comprises the following steps:
obtaining a first seed crystal decomposition product grading overflow liquid;
mixing the second sodium aluminate fine solution with the second crystal seed to obtain a second mixed solution;
discharging the second mixed solution into a plurality of decomposition tanks step by step for reaction to obtain ultra-low sodium aluminum hydroxide and a second crystal decomposition product grading overflow solution;
the decomposition tanks comprise a first decomposition tank and a last decomposition tank;
adding the first seed crystal decomposition product graded overflow liquid into the decomposition first tank;
and recycling the graded overflow liquid of the second crystal decomposed product to the first decomposition tank.
Optionally, the liquid phase a of the first decomposition tankkIs 2.01-2.35.
Optionally, the temperature of the first decomposition tank is 68-80 ℃.
Optionally, the solid content of the first decomposition tank is 500g/L-650 g/L.
Optionally, the sodium aluminate semen NkIs 130g/L to 165 g/L.
Optionally, the sodium aluminate semen alphakIs 1.40-1.60.
Optionally, the temperature of the decomposition end tank is 52-62 ℃.
Optionally, the obtaining of the graded overflow liquid of the first seed crystal decomposition product specifically includes:
mixing the first sodium aluminate fine liquid with the first crystal seed to obtain a first mixed liquid;
and discharging the first mixed liquid into a plurality of decomposition tanks step by step for reaction to obtain the first seed crystal decomposition product grading overflow liquid.
Based on the same inventive concept, the embodiment of the invention also provides the ultralow-sodium aluminum hydroxide, and the ultralow-sodium aluminum hydroxide is prepared by adopting the preparation method of the ultralow-sodium aluminum hydroxide.
Optionally, Na in the ultra-low sodium aluminum hydroxide2The weight content of O is 0.05-0.08%.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the preparation method of the ultralow-sodium aluminum hydroxide provided by the embodiment of the invention comprises the following steps: obtaining a first seed crystal decomposition product grading overflow liquid; mixing the second sodium aluminate fine solution with the second crystal seed to obtain a second mixed solution; discharging the second mixed solution into a plurality of decomposition tanks step by step for reaction to obtain ultra-low sodium aluminum hydroxide and a second crystal decomposition product grading overflow solution; the decomposition tanks comprise a first decomposition tank and a last decomposition tank; adding the first seed crystal decomposition product graded overflow liquid into the decomposition first tank; recycling the second crystal decomposed product graded overflow liquid to the first decomposition tank; the existing crystal seed decomposition product is directly added into the decomposition first tank by partial or all overflow in a grading way, and the filtration of the product grading overflow is cancelled so as to controlSuitable first tank liquid phase alphakThe temperature of the first tank is regulated, the supersaturation degree of the sodium aluminate solution in the first tank is properly reduced, the temperature of the first tank is more easily controlled accurately, and then Na is produced according to the existing decomposition process2An ultra-low sodium aluminum hydroxide product having an O content of 0.05-0.08%; meanwhile, because part of fine-particle aluminum hydroxide and mother liquor do not need to enter the vertical disc for filtration, the filtration efficiency of the vertical disc is improved. The method has the advantages of simple process, low modification investment and popularization and application value.
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 a method provided by an embodiment of the present invention;
fig. 2 is a process diagram provided by an embodiment of the 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 order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a method for preparing ultra-low sodium aluminum hydroxide, the method including: under the conditions that the semen Nk is 130-165g/L and the semen alpha k is 1.40-1.60, the existing seed crystal decomposition product is partially or completely overflowed in a grading way and is directly added into the decomposition first tank, the filtration of the product grading overflow is cancelled, and then the low-sodium aluminum hydroxide product is produced by utilizing the existing process.
Controlling semen NkThe reason for being 130-165g/L is to obtain the ultralow-sodium aluminum hydroxide product, and the excessive value can cause Na in the product2The content of O is rapidly increased, and the decomposition yield is too low due to too small content;
semen alphak1.40-1.60 is determined by the optimal dissolution process of the Bayer process;
as an alternative mode, the liquid phase of the first decomposition tank is controlled to be 2.01-2.35.
Controlling the liquid phase alpha of the first decomposition tankkThe reason for 2.01-2.35 is to control the supersaturation degree of the solution in the first tank, and the excessive value will affect the decomposition speed and increase the product granularity, which is not beneficial to the improvement of the decomposition rate and Na in the product2The content of O is increased, and the adverse effect of too small content is that the decomposition speed is too high, and crystal lattices and intercrystalline alkali of the product are increased;
as an alternative embodiment, the temperature of the first decomposition tank is controlled to be 68-80 ℃.
The reason for controlling the temperature of the first decomposition tank to be 68-80 ℃ is to reduce the supersaturation degree of the solution so as to reduce the decomposition speed, and the excessively high value can cause the excessively low decomposition speed and the coarse granularity of the product, thereby improving the unfavorable decomposition rate and reducing Na in the product2The supersaturation degree of the solution is increased due to the fact that the content of O is too low, and the production of low-sodium aluminum hydroxide is not facilitated;
as an alternative embodiment, the solid content of the first decomposition tank is controlled to be 500-650 g/L.
The reason for controlling the solid content of the first decomposition tank to be 500-650g/L is to control the total surface area of the seed crystals in the decomposed slurry, and the excessively large value can cause the decomposition speed to be excessively high, and the excessively small value can cause the increase of secondary nucleation, which is not beneficial to producing low-sodium aluminum hydroxide;
as an alternative embodiment, the temperature of the decomposition final tank is controlled to be 52-62 ℃.
The reason for controlling the temperature of the decomposition end tank to be 52-62 ℃ is that the supersaturation degree of the solution at the final stage of decomposition is caused, the decomposition rate is reduced when the value is too high, and more Na is generated when the value is too low2An aluminum hydroxide product having a high O content;
according to another exemplary embodiment of the present invention, there is provided an ultra-low sodium aluminum hydroxide, which is prepared by the method for preparing the ultra-low sodium aluminum hydroxide provided above; ultra-low sodium aluminum hydroxide Na2The weight content of O is 0.05-0.08%.
The ultra-low sodium aluminum hydroxide and the preparation method thereof according to the present application will be described in detail below with reference to examples, comparative examples and experimental data.
Example 1
A process for preparing ultralow-sodium aluminium hydroxide includes such steps as overflow of product classification part back to the first decomposing tank, controlling the liquid phase in the first decomposing tank to control the liquid phase alpha in the first decomposing tankk2.01, 80 ℃ and 500g/L of solid content, and simultaneously controlling the temperature of a decomposition end tank to be 62 ℃ through intermediate temperature reduction of a conventional decomposition process to obtain an aluminum hydroxide product Na2The O content was 0.05% (wherein the content of the insoluble alkali was 0.03%).
Example 2
A process for preparing ultralow-sodium aluminium hydroxide includes such steps as classifying the product, overflowing it, returning it to the first decomposing tank, controlling the liquid phase in the first decomposing tank to control the liquid phase alpha in the first decomposing tankk2.35, 68 ℃ and 650g/L of solid content, and simultaneously controlling the temperature of a decomposition end tank to be 52 ℃ through intermediate temperature reduction of a conventional decomposition process to obtain an aluminum hydroxide product Na2The O content was 0.08% (wherein the non-washable alkali was 0.06%).
Example 3
A process for preparing ultralow-sodium aluminium hydroxide includes such steps as classifying the product, overflowing it, returning it to the first decomposing tank, controlling the liquid phase in the first decomposing tank to control the liquid phase alpha in the first decomposing tankk2.25, 70 ℃ and 550g/L of solid content, and simultaneously controlling the temperature of a decomposition end tank to be 55 ℃ through intermediate temperature reduction of a conventional decomposition process to obtain an aluminum hydroxide product Na2The O content was 0.07% (wherein the content of the insoluble alkali was 0.05%).
Example 4
A process for preparing ultralow-sodium aluminium hydroxide includes such steps as overflow of product classification part back to the first decomposing tank, controlling the liquid phase in the first decomposing tank to control the liquid phase alpha in the first decomposing tankk2.15, 70 ℃ and 600g/L of solid content, and simultaneously controlling the temperature of a decomposition end tank to be 60 ℃ through intermediate temperature reduction of a conventional decomposition process to obtain an aluminum hydroxide product Na2The O content was 0.06% (wherein the content of the non-washable alkali was 0.04%).
The following comparative example is derived from the reference CN108751242A, in which the decomposers are specifically set to No. 1 first decomposer, No. 2-3 decomposer, No. 4-15 decomposer and No. 16 last decomposer, the decomposition temperature of No. 1-3 is 65-67 deg.C, and the decomposition temperature is decreased in the order from No. 4 decomposer, and the aluminum hydroxide Na produced in this patent2The content of O is 0.09-0.25%.
Comparative example 1
The comparative example provides a low-sodium alumina decomposition process, wherein a Bayer process is applied to produce alumina, crystal seeds are added into sodium aluminate refined solution, the sodium aluminate in the refined solution is decomposed to separate out alumina in the form of aluminum hydroxide, and the aluminum hydroxide is roasted at low temperature to obtain low-sodium alumina; wherein, in the technological conditions of sodium aluminate decomposition: the solid content of the first tank is limited to 570kg/m3The temperature of the first decomposition tank is 67 ℃, and the semen alphak1.5, and the decomposition time of the sodium aluminate solution is more than or equal to 50 hours.
Comparative example 2
The comparative example provides a process for decomposing low-sodium alumina, which comprises producing alumina by Bayer process, adding crystal seed into sodium aluminate concentrate, and decomposing sodium aluminate in the concentrate to make alumina in the form of hydrogenPrecipitating alumina, and roasting the aluminum hydroxide at low temperature to obtain low-sodium alumina; wherein, in the technological conditions of sodium aluminate decomposition: the solid content of the first tank is limited to 670kg/m3The temperature of the first decomposition tank is 65 ℃, and the semen alphakThe decomposition time of the sodium aluminate solution is more than or equal to 50h and is 1.55.
Comparative example 3
The comparative example provides a low-sodium alumina decomposition process, wherein a Bayer process is applied to produce alumina, crystal seeds are added into sodium aluminate refined solution, the sodium aluminate in the refined solution is decomposed to separate out alumina in the form of aluminum hydroxide, and the aluminum hydroxide is roasted at low temperature to obtain low-sodium alumina; wherein, in the technological conditions of sodium aluminate decomposition: the solid content of the first tank is limited to 650g/cm3, the temperature of the first decomposition tank is 66 ℃, and the semen alpha isk1.52, seminal fluid NkAt 156g/l, the dissolution was alphak1.50, and the decomposition time of the sodium aluminate solution is more than or equal to 50 hours.
Comparative example 4
The comparative example provides a low-sodium alumina decomposition process, wherein a Bayer process is applied to produce alumina, crystal seeds are added into sodium aluminate refined solution, the sodium aluminate in the refined solution is decomposed to separate out alumina in the form of aluminum hydroxide, and the aluminum hydroxide is roasted at low temperature to obtain low-sodium alumina; wherein, in the technological conditions of sodium aluminate decomposition: the solid content of the first groove is limited to 580kg/m3The temperature of the first decomposition tank is 65.5 ℃, and the semen alphak1.51, seminal fluid NkIs 164g/l, dissolves ak1.44, and the decomposition time of the sodium aluminate solution is more than or equal to 50 hours.
As can be seen from the comparison between the examples and comparative examples of the present application, the most important feature of the present application is the control of the liquid phase alpha in the first tankkAnd the control range of the initial tank temperature and the solid content is also different from the comparative example. Finally, Na is contained in the aluminum hydroxide prepared by the method2The O content is 0.05-0.08% and the comparative example is 0.09-0.25%, it can be seen that Na is contained in the aluminum hydroxide obtained by the present method2The O content is much lower than in the comparative example.
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 provided by the embodiment of the invention, the existing crystal seed decomposition product grading partial or whole overflow is directly added into the decomposition first tank, so that the filtration of the product grading overflow is cancelled, the process is simple, and the stable control is easy;
(2) according to the method provided by the embodiment of the invention, part of fine-particle aluminum hydroxide and mother liquor do not need to enter the vertical disc for filtration, so that the filtration efficiency of the vertical disc is improved. The method has simple process and less modification investment;
(3) the ultralow-sodium aluminum hydroxide product Na produced by the method provided by the embodiment of the invention2The content of O is 0.05-0.08%.
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 preparation method of ultralow-sodium aluminum hydroxide is characterized by comprising the following steps:
obtaining a first seed crystal decomposition product grading overflow liquid;
mixing the second sodium aluminate fine solution with the second crystal seed to obtain a second mixed solution;
discharging the second mixed solution into a plurality of decomposition tanks step by step for reaction to obtain ultra-low sodium aluminum hydroxide and a second crystal decomposition product grading overflow solution;
the decomposition tanks comprise a first decomposition tank and a last decomposition tank;
adding the first seed crystal decomposition product graded overflow liquid into the decomposition first tank;
and recycling the graded overflow liquid of the second crystal decomposed product to the first decomposition tank.
2. The method for preparing ultra-low-sodium aluminum hydroxide according to claim 1, wherein the liquid phase alpha of the decomposition initial tankkIs 2.01-2.35.
3. The preparation method of the ultra-low-sodium aluminum hydroxide according to claim 1, wherein the temperature of the decomposition initial tank is 68-80 ℃.
4. The preparation method of the ultra-low-sodium aluminum hydroxide according to claim 1, wherein the solid content of the decomposition initial tank is 500g/L-650 g/L.
5. The method for preparing ultra-low sodium aluminum hydroxide according to claim 1, wherein the sodium aluminate concentrate solution NkIs 130g/L to 165 g/L.
6. The method for preparing ultra-low sodium aluminum hydroxide according to claim 1, wherein the sodium aluminate concentrate liquid is alphakIs 1.40-1.60.
7. The preparation method of the ultra-low-sodium aluminum hydroxide according to claim 1, wherein the temperature of the decomposition final tank is 52-62 ℃.
8. The preparation method of the ultra-low-sodium aluminum hydroxide according to claim 1, wherein the step of obtaining the first seed crystal decomposition product grading overflow liquid specifically comprises the following steps:
mixing the first sodium aluminate fine liquid with the first crystal seed to obtain a first mixed liquid;
and discharging the first mixed liquid into a plurality of decomposition tanks step by step for reaction to obtain the first seed crystal decomposition product grading overflow liquid.
9. An ultra-low sodium aluminum hydroxide, which is prepared by the preparation method of the ultra-low sodium aluminum hydroxide as claimed in any one of claims 1 to 8.
10. The ultra-low sodium aluminum hydroxide of claim 9 wherein the ultra-low sodium aluminum hydroxide has Na therein2The weight content of O is 0.05-0.08%.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1276017B (en) * | 1962-08-31 | 1968-08-29 | Giulini Gmbh Geb | Process for reducing the sodium oxide content in technical aluminum oxide |
| US4014985A (en) * | 1975-12-22 | 1977-03-29 | Aluminum Company Of America | Precipitation of aluminum oxide having low sodium oxide content |
| CN101691233A (en) * | 2009-10-27 | 2010-04-07 | 杭州锦江集团有限公司 | System and process for decomposing crystal seed of aluminum hydroxide |
| CN101746796A (en) * | 2009-12-18 | 2010-06-23 | 中国铝业股份有限公司 | Method for preparing low-sodium aluminum hydroxide by decomposing sodium aluminate solution |
| CN105399122A (en) * | 2015-12-18 | 2016-03-16 | 东北大学设计研究院（有限公司） | First-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition |
| CN106564920A (en) * | 2016-11-07 | 2017-04-19 | 中国铝业股份有限公司 | Method for increasing bayer process seed decomposition rate |
| CN108751242A (en) * | 2018-08-27 | 2018-11-06 | 三门峡义翔铝业有限公司 | A kind of low sodium alumina decomposition technique and low sodium alumina |
-
2021
- 2021-11-02 CN CN202111290800.8A patent/CN113788488B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1276017B (en) * | 1962-08-31 | 1968-08-29 | Giulini Gmbh Geb | Process for reducing the sodium oxide content in technical aluminum oxide |
| US4014985A (en) * | 1975-12-22 | 1977-03-29 | Aluminum Company Of America | Precipitation of aluminum oxide having low sodium oxide content |
| CN101691233A (en) * | 2009-10-27 | 2010-04-07 | 杭州锦江集团有限公司 | System and process for decomposing crystal seed of aluminum hydroxide |
| CN101746796A (en) * | 2009-12-18 | 2010-06-23 | 中国铝业股份有限公司 | Method for preparing low-sodium aluminum hydroxide by decomposing sodium aluminate solution |
| CN105399122A (en) * | 2015-12-18 | 2016-03-16 | 东北大学设计研究院（有限公司） | First-tank temperature controlling and discharging grading method for producing sandy aluminium oxide through two-segment decomposition |
| CN106564920A (en) * | 2016-11-07 | 2017-04-19 | 中国铝业股份有限公司 | Method for increasing bayer process seed decomposition rate |
| CN108751242A (en) * | 2018-08-27 | 2018-11-06 | 三门峡义翔铝业有限公司 | A kind of low sodium alumina decomposition technique and low sodium alumina |
Non-Patent Citations (1)
| Title |
|---|
| 陈玉国等: "林同氧化铝项目两段法分解工艺流程应用研究", 《轻金属》 * |
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