CN111606340A - High-low concentration sodium aluminate solution evaporation production process - Google Patents
High-low concentration sodium aluminate solution evaporation production process Download PDFInfo
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- CN111606340A CN111606340A CN202010510655.9A CN202010510655A CN111606340A CN 111606340 A CN111606340 A CN 111606340A CN 202010510655 A CN202010510655 A CN 202010510655A CN 111606340 A CN111606340 A CN 111606340A
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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
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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
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Abstract
The invention relates to the technical field of evaporation production of sodium aluminate solution, in particular to an evaporation production process of high-concentration and low-concentration sodium aluminate solution, wherein the high-concentration sodium aluminate solution is evaporated by a high-concentration evaporation device, and the low-concentration sodium aluminate solution is evaporated by a low-concentration evaporation device; and the concentrated solution evaporated by the high-concentration evaporation device and the low-concentration evaporation device respectively enters a blending system for blending. The invention evaporates the high and low concentration sodium aluminate solution in the alumina production by different evaporation devices, thereby realizing the reduction of the steam consumption of the evaporation unit of the alumina plant, realizing the purpose of energy conservation and emission reduction of the plant, and being beneficial to meeting the higher requirements of national environmental protection.
Description
Technical Field
The invention relates to the technical field of evaporation production of sodium aluminate solution, in particular to an evaporation production process of high-concentration and low-concentration sodium aluminate solution.
Background
In the prior production, high-concentration sodium aluminate solution is sent to an evaporation system to be mixed, and is evaporated by using an evaporation device, but because the boiling points of the high-concentration sodium aluminate solution and the low-concentration sodium aluminate solution have large difference, the characteristics of the high-concentration sodium aluminate solution and the low-concentration sodium aluminate solution can not be taken into consideration by using the evaporation device for type selection design, the energy-saving effect cannot be fully exerted by using a single evaporation device, and the integral steam consumption of an actual production evaporation unit is 0.18-0.25 t-steam/t-water. The most energy-saving evaporation device in practical application of current production is seven-effect tube type falling film evaporation, the actual steam consumption is 0.18-0.20 t-steam/t-water, energy conservation and emission reduction are greatly promoted in the current country, and particularly under the condition that the national environmental protection requirement tends to be strict, the direction of research personnel's efforts is always to seek more energy-saving evaporation production technology. According to the application conditions of other industries, the steam consumption of the MVR evaporation device is about 0.04-0.10 t-steam/t-water, although the electricity consumption is increased, the whole evaporation device is energy-saving compared with a tubular falling film evaporator, and the comprehensive cost is saved by about 20%. In order to further reduce the energy consumption of the production process of the alumina plant, the invention discloses a high-low concentration sodium aluminate solution evaporation production process technology, which realizes the purposes of energy conservation and emission reduction of the plant and is beneficial to meeting the higher requirements of national environmental protection.
Disclosure of Invention
In order to solve the technical problems, the invention provides an evaporation production process of high-concentration and low-concentration sodium aluminate solution, which is characterized in that the high-concentration and low-concentration sodium aluminate solution is separated from the process flow, and evaporation devices in different forms are respectively adopted, so that the evaporation devices can exert respective effects.
The specific technical scheme is as follows:
a high-concentration sodium aluminate solution evaporates the production technology, the high-concentration sodium aluminate solution evaporates with the high concentration evaporation plant, the low-concentration sodium aluminate solution evaporates with the low concentration evaporation plant; concentrated solution evaporated by the high-concentration evaporation device and the low-concentration evaporation device respectively enters a blending system for blending;
the high-concentration sodium aluminate solution Na2OkThe concentration is 100-200 g/L, and the seed precipitation mother liquor is obtained; low concentration sodium aluminate solution Na2OkThe concentration is 15-100 g/L, and can be aluminum hydroxide washing liquid, oxalate causticizing liquid or crystalline alkali causticizing liquid, wherein Na2OkIs Na in the production of alumina2NaOH in terms of O and K represents caustic alkali.
The high-concentration evaporation device is an evaporation system consisting of one or more evaporators, and the evaporators are tubular, plate-type or shell-and-tube type; the low-concentration evaporation device is an evaporation system composed of one or more evaporators, and the form of the evaporator is MVR.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention evaporates the high and low concentration sodium aluminate solution in the alumina production by different evaporation devices, thereby realizing the reduction of the steam consumption of the evaporation unit of the alumina plant, realizing the purpose of energy conservation and emission reduction of the plant, and being beneficial to meeting the higher requirements of national environmental protection.
Drawings
FIG. 1 is a schematic view of the evaporation process of the high and low concentration sodium aluminate solution of the present invention.
In the figure, 1-high concentration evaporation apparatus; 2-low concentration evaporation plant; and 3, preparing the system.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited by the embodiments.
FIG. 1 is a schematic diagram of the evaporation process of high and low concentration sodium aluminate solution of the present invention, wherein the high concentration sodium aluminate solution in alumina production is evaporated by a high concentration evaporation apparatus 1, and enters a blending system 3 for blending after concentration; the low-concentration sodium aluminate solution is evaporated by a low-concentration evaporation device 2, and enters a blending system 3 for blending after being concentrated.
Example 1
High concentration sodium aluminate solution Na2OkThe concentration is 100g/L, which is seed precipitation mother liquor; low concentration sodium aluminate solution Na2OkThe concentration is 15g/L, and the washing liquid is aluminum hydroxide washing liquid, wherein, Na2OkIs Na in the production of alumina2NaOH in terms of O and K represents caustic alkali.
The high-concentration evaporation device is composed of an evaporator to form an evaporation system, and the evaporator is in a tubular form; the low-concentration evaporation device comprises an evaporation system consisting of an evaporator, and the evaporator is in the form of MVR.
Evaporating the high-concentration sodium aluminate solution by using a high-concentration evaporation device 1, and blending the concentrated solution in a blending system 3; the low-concentration sodium aluminate solution is evaporated by a low-concentration evaporation device 2, and enters a blending system 3 for blending after being concentrated.
Example 2
High concentration sodium aluminate solution Na2OkThe concentration is 150g/L, which is seed precipitation mother liquor; low concentration sodium aluminate solution Na2OkThe concentration is 50g/L, and the oxalate causticizing solution is Na2OkIs Na in the production of alumina2NaOH in terms of O and K represents caustic alkali.
The high-concentration evaporation device is an evaporation system consisting of a plurality of evaporators, and the evaporators are plate-type; the low-concentration evaporation device is an evaporation system formed by a plurality of evaporators, and the form of the evaporator is MVR.
Evaporating the high-concentration sodium aluminate solution by using a high-concentration evaporation device 1, and blending the concentrated solution in a blending system 3; the low-concentration sodium aluminate solution is evaporated by a low-concentration evaporation device 2, and enters a blending system 3 for blending after being concentrated.
Example 3
High concentration sodium aluminate solution Na2OkThe concentration is 200g/L, which is seed precipitation mother liquor; low concentration sodium aluminate solution Na2OkThe concentration is 100g/L, and the sodium hydroxide is a crystallization alkali causticization solution, wherein, Na2OkIs Na in the production of alumina2NaOH in terms of O and K represents caustic alkali.
The high-concentration evaporation device is an evaporation system consisting of one or more evaporators, and the evaporators are in a shell-and-tube type; the low-concentration evaporation device is an evaporation system formed by a plurality of evaporators, and the form of the evaporator is MVR.
Evaporating the high-concentration sodium aluminate solution by using a high-concentration evaporation device 1, and blending the concentrated solution in a blending system 3; the low-concentration sodium aluminate solution is evaporated by a low-concentration evaporation device 2, and enters a blending system 3 for blending after being concentrated.
Claims (2)
1. An evaporation production process of high-low concentration sodium aluminate solution is characterized in that: evaporating the high-concentration sodium aluminate solution by using a high-concentration evaporation device, and evaporating the low-concentration sodium aluminate solution by using a low-concentration evaporation device; concentrated solution evaporated by the high-concentration evaporation device and the low-concentration evaporation device respectively enters a blending system for blending;
the high-concentration sodium aluminate solution Na2OkThe concentration is 100-200 g/L, and the seed precipitation mother liquor is obtained; low concentration sodium aluminate solution Na2OkThe concentration is 15-100 g/L, and can be aluminum hydroxide washing liquid, oxalate causticizing liquid or crystalline alkali causticizing liquid, wherein Na2OkIs Na in the production of alumina2NaOH in terms of O and K represents caustic alkali.
2. The evaporation production process of high and low concentration sodium aluminate solution as claimed in claim 1, characterized in that: the high-concentration evaporation device is an evaporation system consisting of one or more evaporators, and the evaporators are tubular, plate-type or shell-and-tube type; the low-concentration evaporation device is an evaporation system composed of one or more evaporators, and the form of the evaporator is MVR.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116467911A (en) * | 2023-04-13 | 2023-07-21 | 深圳职业技术学院 | Multi-working-condition information fusion-based evaporation process outlet solution concentration estimation method |
Citations (6)
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|---|---|---|---|---|
| WO1997032817A1 (en) * | 1996-03-05 | 1997-09-12 | Goro Sato | Alumina sol, process for preparing the same, process for preparing alumina molding using the same, and alumina-based catalyst prepared thereby |
| CN1579943A (en) * | 2004-05-14 | 2005-02-16 | 山东铝业股份有限公司 | Carbon fracture mother liquor evaporation, crystallization and salting process |
| CN102502733A (en) * | 2011-10-26 | 2012-06-20 | 中国铝业股份有限公司 | Method for treating gibbsite by using high-concentration alkali liquor under normal pressure |
| CN102976379A (en) * | 2012-12-01 | 2013-03-20 | 中南大学 | Method for crystal seed precipitation of sodium aluminate solution |
| CN104945026A (en) * | 2015-06-30 | 2015-09-30 | 乳源瑶族自治县东阳光化成箔有限公司 | Device and production method for producing agriculture calcium ammonium nitrate from dilute nitric acid wastewater |
| CN105776266A (en) * | 2016-02-06 | 2016-07-20 | 杭州锦江集团有限公司 | High-concentration evaporation salt elimination method for seed precipitation solution |
-
2020
- 2020-06-08 CN CN202010510655.9A patent/CN111606340A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997032817A1 (en) * | 1996-03-05 | 1997-09-12 | Goro Sato | Alumina sol, process for preparing the same, process for preparing alumina molding using the same, and alumina-based catalyst prepared thereby |
| CN1579943A (en) * | 2004-05-14 | 2005-02-16 | 山东铝业股份有限公司 | Carbon fracture mother liquor evaporation, crystallization and salting process |
| CN102502733A (en) * | 2011-10-26 | 2012-06-20 | 中国铝业股份有限公司 | Method for treating gibbsite by using high-concentration alkali liquor under normal pressure |
| CN102976379A (en) * | 2012-12-01 | 2013-03-20 | 中南大学 | Method for crystal seed precipitation of sodium aluminate solution |
| CN104945026A (en) * | 2015-06-30 | 2015-09-30 | 乳源瑶族自治县东阳光化成箔有限公司 | Device and production method for producing agriculture calcium ammonium nitrate from dilute nitric acid wastewater |
| CN105776266A (en) * | 2016-02-06 | 2016-07-20 | 杭州锦江集团有限公司 | High-concentration evaporation salt elimination method for seed precipitation solution |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116467911A (en) * | 2023-04-13 | 2023-07-21 | 深圳职业技术学院 | Multi-working-condition information fusion-based evaporation process outlet solution concentration estimation method |
| CN116467911B (en) * | 2023-04-13 | 2023-12-15 | 深圳职业技术学院 | Multi-working-condition information fusion-based evaporation process outlet solution concentration estimation method |
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