CN211419589U - Device for one-step refining of ion membrane caustic soda by removing silicon and aluminum from brine and deeply refining - Google Patents
Device for one-step refining of ion membrane caustic soda by removing silicon and aluminum from brine and deeply refining Download PDFInfo
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- CN211419589U CN211419589U CN201921215660.6U CN201921215660U CN211419589U CN 211419589 U CN211419589 U CN 211419589U CN 201921215660 U CN201921215660 U CN 201921215660U CN 211419589 U CN211419589 U CN 211419589U
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Abstract
The utility model relates to a device that ionic membrane caustic soda once refined brine removes silicon aluminium degree of depth and refines, include neutralization reaction pond (1), sedimentation tank (2), ultrafiltration unit (3) and mud-water separator (4) that connect gradually from the upper reaches downstream. Compared with the prior art, the utility model discloses do not change the refined technology of current brine, do not influence current production, only increase the refined unit of degree of depth at the last of the refined process of current brine, the skill improves easy implementation, and the refined dosage of adding is few and can not remain in the refined brine, can get rid of silicon-aluminium impurity simultaneously again simultaneously, and the tolerance of operation is big.
Description
Technical Field
The utility model belongs to the technical field of the caustic soda production and specifically relates to a device that ionic membrane caustic soda once refined salt water removes silicon-aluminium degree of depth and refines is related to.
Background
The production of caustic soda by adopting sodium chloride saturated brine is a mature technology, and since the ionic membrane alkali-making technology in the mid-eighties of the world is successfully applied to the chlor-alkali industry in China, the chlor-alkali industry in China has the advantages that the technology and equipment are both rapidly improved, and the productivity is the first in the world. With the continuous progress of the technology, obtaining high-quality brine, reducing power consumption and prolonging the service life of the ionic membrane become the subject of research of various manufacturers in the chlor-alkali industry.
Brine entering electrolytic tank through ionic membrane caustic soda pairStrict requirements are imposed on the indexes of silicon and aluminum in the brine besides indexes of calcium and magnesium ions, suspended matters and the like, such as: SiO 22≤5mg/L，Al3+Less than or equal to 0.1mg/L and the like.
In view of the fact that a plurality of concrete facilities such as a brine pond, a bulk salt pond, a salt dissolving pond and the like are adopted in the existing chlor-alkali production, so that concrete is corroded, silicon and aluminum are dissolved into brine, and primary brine refining is mainly used for removing calcium, magnesium ions and suspended matters, the whole refining process is carried out under the alkaline condition (the sodium hydroxide overbasic amount is 0.1-0.3g/L, and the sodium carbonate overbasic amount is 0.3-0.5g/L), while silicon as an amphoteric nonmetal and aluminum as an amphoteric metal have high solubility under the alkaline condition. In addition, silicon and aluminum which cannot be removed by the conventional primary brine refining cannot be removed, and dissolved silicon and aluminum cannot be removed by a chelating resin tower for secondary brine refining, and the silicon and the aluminum directly pollute and block an ion membrane after entering an electrolytic bath along with brine, so that the current efficiency of electrolysis is reduced, the power consumption is increased, and the service life of the ion membrane is shortened.
With the continuous production, the continuous aging and the corrosion prevention damage of the original equipment, the dissolution of silicon and aluminum in concrete terraces and equipment and the influence on ionic membranes will be further deepened, and no effective solution is available in the industry at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects existing in the prior art and providing a device which is suitable for the existing production status quo of chlor-alkali, solves the influence of silicon and aluminum on an ionic membrane and improves the saline quality for one-time refining of the ionic membrane caustic soda by removing silicon aluminum and deeply refining.
The utility model does not change the prior brine refining process, does not influence production, only increases the deep refining unit at the last of the prior brine refining process, silicon and aluminum indexes in the brine after the deep refining meet the requirement that the ion membrane caustic soda enters the electrolytic bath, and SiO2≤5mg/L，Al3+≤0.1mg/L；
The method can be realized by the following technical scheme:
device for removing silicon and aluminum and deeply refining brine by one-step refining of ion membrane caustic sodaThe device comprises a neutralization reaction tank (1), a sedimentation tank (2), an ultrafiltration unit (3) and a sludge-water separator (4) which are sequentially connected from upstream to downstream. Adding high-purity hydrochloric acid into the primary refined brine after calcium and magnesium removal and suspended matter removal in a neutralization reaction tank to adjust the pH to 6-8 to obtain the product containing SiO2Precipitated neutral brine; then sending the neutral brine into a sedimentation tank, and carrying out adsorption coprecipitation reaction by using a precipitator to obtain brine containing iron hydroxide and aluminum hydroxide suspended matters; then, a brine ultrafiltration unit is used for intercepting precipitates in the brine by an ultrafiltration membrane, and the precipitates are discharged along with circulation liquid of the ultrafiltration membrane and enter a mud-water separator for dehydration to obtain sludge; the permeate of the ultrafiltration membrane is used as refined brine and enters a secondary brine refining system;
furthermore, an intermediate tank is arranged between the sedimentation tank (2) and the ultrafiltration unit (3).
Further, a liquid outlet of the sludge dehydrator (4) is connected with a liquid inlet of the middle groove.
Furthermore, a primary brine refining conveying pipeline and a pipeline mixer are arranged on the neutralization reaction tank (1), the primary brine refining conveying pipeline is connected with a primary refined brine outlet of the existing primary brine refining process, and the pipeline mixer is connected with a high-purity hydrochloric acid storage tank.
Furthermore, the pipeline mixer is provided with an adjusting valve for controlling the adding rate; the pipeline mixer and the regulating valve are made of organic polymer materials or metal pieces subjected to anticorrosive treatment.
Furthermore, a PVDF metering pump or a pipeline mixer is arranged on the sedimentation tank (2), and the PVDF metering pump or the pipeline mixer is connected with a precipitant storage tank. The precipitant comprises one or more of ferric trichloride, ferrous sulfate, ferric sulfate, polymeric ferric chloride or polymeric ferric sulfate.
Furthermore, the aperture of the ultrafiltration membrane in the ultrafiltration unit (3) is 0.03-0.08 μm, and the structural form is column type, immersion type or flat plate type; the ultrafiltration adopts cross flow filtration, and the pressure is 0.1-0.5 MPa. The ultrafiltration membrane is made of one or more of PVDF, polysulfone, polyethersulfone or ceramic membrane.
Furthermore, a trapped fluid outlet of the ultrafiltration unit (3) is connected with the mud-water separator (4), and a penetrating fluid outlet of the ultrafiltration unit (3) is connected with a subsequent working section.
Further, the sludge dehydrator (4) comprises one or more of a plate-and-frame filter press, a screw stack machine, a vacuum filter or a belt filter.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the device does not change the prior primary brine refining system, does not influence the prior production, only adds a deep refining unit at the end of the prior primary brine refining process, and is easy to technically improve;
(2) silicon-aluminum impurities can be removed simultaneously, and the operation tolerance is high;
(3) the equipment is simple and convenient to control;
(4) the indexes of silicon and aluminum in the refined brine after deep refining meet the requirement that the ionic membrane caustic soda enters an electrolytic cell, namely SiO2≤5mg/L，Al3+≤0.1mg/L；
Drawings
Fig. 1 is a diagram of the device of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
The ionic membrane caustic soda primary brine refining system of a certain chemical plant adopts the processes of adding sodium hydroxide for magnesium removal in the pre-reaction, floating a clarifying tank to be used as the pretreatment of crude brine, adding sodium carbonate for calcium removal in the post-reaction, and filtering a membrane to remove water insoluble substances formed in the reaction, and the process of removing calcium and magnesium needs to control the alkali excess of sodium hydroxide and sodium carbonate, so that the refined brine is alkaline, the pH value is 10.5-11.5, and the sodium hydroxide is 0.1-0.3 g/L; 0.3-0.5g/L of sodium carbonate, wherein impurities such as silicon and aluminum entering the brine along with the raw materials under the condition cannot be removed by the conventional process, and the refined primary brine comprises the following components: 305 +/-5 g/L of sodium chloride, 7.4g/L of sodium sulfate and Ca2++Mg2+≤1mg/L，SS≤1mg/L，SiO25.0～20mg/L，Al3+1.20-7.85mg/L, wherein the index of silicon and aluminum becomes the hidden trouble of the ionic membrane electric tank.
The device of the utility model is used for removing silicon aluminum, the device is a device for once refining brine by ion membrane caustic soda and removing silicon aluminum deep refining, as shown in figure 1, comprises a neutralization reaction tank 1, a sedimentation tank 2, an ultrafiltration unit 3 and a mud-water separator 4 which are connected in sequence from the upstream to the downstream. An intermediate tank is also arranged between the sedimentation tank 2 and the ultrafiltration unit 3.
And a pipeline mixer is arranged on the neutralization reaction tank 1 and is connected with a high-purity hydrochloric acid storage tank. The pipeline mixer is provided with a regulating valve for controlling the adding rate; the pipeline mixer and the regulating valve are made of organic polymer materials subjected to anti-corrosion treatment.
And a PVDF metering pump is arranged on the sedimentation tank 2 and is connected with a precipitant storage tank.
The aperture of the ultrafiltration membrane in the ultrafiltration unit 3 is 0.03-0.08 μm, and the structure form is a column type; the ultrafiltration adopts cross flow filtration, and the pressure is 0.1-0.5 MPa. The trapped fluid outlet of the ultrafiltration unit 3 is connected with the mud-water separator 4, and the penetrating fluid outlet of the ultrafiltration unit 3 is connected with the subsequent working section.
The sludge dehydrator 4 is a plate-and-frame filter press. The liquid outlet of the sludge dehydrator 4 is connected with the liquid inlet of the middle groove.
The refined brine meeting the production requirement of the ionic membrane caustic soda is obtained after the device is used, and the concentration of each component of the refined brine is as follows: 305 +/-5 g/L of sodium chloride, 7.4-15g/L of sodium sulfate and Ca2++Mg2+0.5～1mg/L，SS≤0.5mg/L，SiO2≤5mg/L，Al3+Less than or equal to 0.1 mg/L; under the condition of utilizing the device without changing the prior primary brine refining process, the refined brine with better quality is obtained.
Example 2
The ionic membrane caustic soda of a chlor-alkali plant in Xinjiang runs well all the time, the service life of the first set of ionic membrane reaches more than 5 years, but the cell voltage rises faster recently, and the content of silicon and aluminum in the salt water entering the cell is proved to be serious through analysis, wherein SiO is210.5mg/L，Al3+1.1mg/L, and the silicon and the aluminum have a tendency to be enriched in light salt water.
Because the chlor-alkali plant adopts the brine refining process of pre-reaction, pretreatment, post-reaction and polytetrafluoroethylene membrane filtration, silicon-aluminum impurities brought by the original salt cannot be removed through the refining process, and the brine enters the system through the inlet groove and is slowly enriched in the light brine, so that the production is affected.
The salt water entering the tank of the chlor-alkali plant is extracted and operated by adopting the device of the utility model; the utility model relates to a refined brine of ionic membrane caustic soda removes silicon aluminium degree of depth refined device refers to figure 1, including neutralization reaction tank 1, sedimentation tank 2, ultrafiltration unit 3 and mud-water separator 4 that connect gradually from the upper reaches to low reaches. An intermediate tank is also arranged between the sedimentation tank 2 and the ultrafiltration unit 3.
And a pipeline mixer is arranged on the neutralization reaction tank 1 and is connected with a high-purity hydrochloric acid storage tank. The pipeline mixer is provided with a regulating valve for controlling the adding rate; the pipeline mixer and the regulating valve adopt metal pieces subjected to anti-corrosion treatment.
And a pipeline mixer is arranged on the sedimentation tank 2 and is connected with a precipitant storage tank.
The aperture of the ultrafiltration membrane in the ultrafiltration unit 3 is 0.03-0.08 μm, and the structural form is a flat plate type; the ultrafiltration adopts cross flow filtration, and the pressure is 0.1-0.5 MPa. The trapped fluid outlet of the ultrafiltration unit 3 is connected with the mud-water separator 4, and the penetrating fluid outlet of the ultrafiltration unit 3 is connected with the subsequent working section.
The sludge dehydrator 4 is a belt filter. The liquid outlet of the sludge dehydrator 4 is connected with the liquid inlet of the middle groove.
The refined brine meeting the production requirement of the ionic membrane caustic soda is obtained after the device is used, and the concentration of each component of the refined brine is as follows: 305 +/-5 g/L of sodium chloride, 7.4-15g/L of sodium sulfate and Ca2++Mg2+0.5-1mg/L，SS≤0.5mg/L，SiO2≤5mg/L，Al3+Less than or equal to 0.1 mg/L; under the condition of utilizing the device without changing the prior primary brine refining process, the refined brine with better quality is obtained.
Therefore, adopt the utility model discloses a problem that the trough brine silicon-aluminum exceeds standard not only can be solved to the device, avoid the enrichment of silicon-aluminum impurity in the system, and can solve because of the terrace, civil engineering equipment, the problem that silicon-aluminum impurity that former salt is polluted by silicon-aluminum impurity and is caused gets into chlor-alkali production system, make the inexhaustible after of chlor-alkali enterprise worry, the tolerance of former salt quality has also been increased, the degree of difficulty and the cost of production of the former salt purchase of reduction, first time outside, can also prolong the life-span of ionic membrane, reduce the energy consumption of production, bring certain economic benefits for the enterprise.
The above embodiments are only used for illustrating the technical solution of the present invention, and are not intended to limit the present invention, and those skilled in the art can make equivalent changes, substitutions, modifications, and simplifications within the scope of the present invention, without departing from the spirit of the present invention, and shall also fall within the protection scope of the claims of the present invention.
Claims (7)
1. The device for once refining the brine by using the ionic membrane caustic soda to remove silicon and aluminum is characterized by comprising a neutralization reaction tank (1), a sedimentation tank (2), an ultrafiltration unit (3) and a sludge-water separator (4) which are sequentially connected from upstream to downstream; the aperture of the ultrafiltration membrane in the ultrafiltration unit (3) is 0.03-0.08 μm, and the structural form is column type, immersion type or flat plate type; the ultrafiltration adopts cross flow filtration, and the pressure is 0.1-0.5 MPa; the trapped fluid outlet of the ultrafiltration unit (3) is connected with the mud-water separator (4), and the penetrating fluid outlet of the ultrafiltration unit (3) is connected with the subsequent working section.
2. The device for the primary refining of the brine by removing the silicon and the aluminum by the ionic membrane caustic soda according to claim 1, which is characterized in that an intermediate tank is arranged between the sedimentation tank (2) and the ultrafiltration unit (3).
3. The device for primary refining of brine to remove silicon and aluminum and deeply refine as claimed in claim 2, wherein the liquid outlet of the mud-water separator (4) is connected with the liquid inlet of the intermediate tank.
4. The device for primary brine refining and desilicification deep refining of the ionic membrane caustic soda as claimed in claim 1, characterized in that a primary brine refining conveying pipeline and a pipeline mixer are arranged on the neutralization reaction tank (1), and the pipeline mixer is connected with a high-purity hydrochloric acid storage tank.
5. The device for primary refining of brine, removing silicon and aluminum and deeply refining of ionic membrane caustic soda according to claim 4, characterized in that the pipeline mixer is provided with an adjusting valve for controlling the adding rate; the pipeline mixer and the regulating valve are made of organic polymer materials or metal pieces subjected to anticorrosive treatment.
6. The device for the one-time refining of the brine to remove the silicon and aluminum and deeply refine the brine to remove the silicon and aluminum according to the claim 1, characterized in that a PVDF metering pump or a pipeline mixer is arranged on the sedimentation tank (2), and the PVDF metering pump or the pipeline mixer is connected with a precipitant storage tank.
7. The device for primary refining of brine and removing silicon and aluminum and deeply refining of brine by using ionic membrane caustic soda as claimed in claim 1, wherein the mud-water separator (4) comprises one or more of a plate-and-frame filter press, a stacked screw machine, a vacuum filter or a belt filter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921215660.6U CN211419589U (en) | 2019-07-30 | 2019-07-30 | Device for one-step refining of ion membrane caustic soda by removing silicon and aluminum from brine and deeply refining |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921215660.6U CN211419589U (en) | 2019-07-30 | 2019-07-30 | Device for one-step refining of ion membrane caustic soda by removing silicon and aluminum from brine and deeply refining |
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| CN211419589U true CN211419589U (en) | 2020-09-04 |
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| CN201921215660.6U Active CN211419589U (en) | 2019-07-30 | 2019-07-30 | Device for one-step refining of ion membrane caustic soda by removing silicon and aluminum from brine and deeply refining |
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