CN111672193A - Method and device for purifying combined alkali mother liquor II by PE membrane method - Google Patents
Method and device for purifying combined alkali mother liquor II by PE membrane method Download PDFInfo
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Abstract
The invention relates to a method and a device for purifying mother liquor by a membrane method, wherein hot mother liquor II from an associated alkali is sent to a sand filtration device through a mother liquor II bucket under the action of a pump, and particulate matters and oily flocculates with the particle size larger than 1.0mm are removed by filtration; conveying the mother liquor II filtered by the sand filter device to the bottom of a PE membrane filter device, collecting filtrate filtered by the PE membrane filter device through a filtrate barrel, conveying the filtrate to an ammonia absorption process by a pump, and then conveying the filtrate to a carbonization alkali making process to produce a soda product; the concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected; pumping the crystal slurry in the concentrated solution barrel to a filter pressing process, and treating the obtained solid waste and the salt slurry together as common waste; or pumping to salting-out process to produce agricultural ammonium product. Compared with the method for purifying the mother liquor II by using the ceramic membrane, the PE membrane filtering device has the advantages of simple treatment process, simple and convenient operation and low membrane production cost, and the turbidity of the treated mother liquor II can meet the production requirement.
Description
Technical Field
The invention relates to a method and a device for purifying mother liquor by a membrane method, in particular to a method and a device for purifying combined alkali mother liquor II by a Polyethylene (PE) membrane method.
Background
In the process of producing the calcined soda by the combined soda process, the content of calcium ions and magnesium ions in mother liquor II needs to be strictly controlled, and the concentration of the calcium ions and the magnesium ions directly determines the turbidity of the solution and the whiteness of a product, so that the quality of the product is influenced. The prior purification process of the combined alkali method mother liquor II mainly adopts a first-stage clarification process of a clarifying barrel to treat calcium, magnesium and other water-insoluble substances, but the process is easily influenced by production fluctuation, and the effective clarification area of the clarifying barrel is generally small, so that the removal effect of calcium and magnesium ions in the clarified mother liquor II is limited; in addition, the process has the disadvantages of large equipment volume and high investment. Therefore, in order to improve the quality of the soda ash product, the optimization and improvement of the existing mother liquor II purification process are urgently needed.
Although the related process optimization and improvement are reported, a plurality of disadvantages still exist in the processes. For example, there is a process for treating mother liquor II by a ceramic membrane method (patents CN103523802B, CN104437097B and CN104445549B), which can remarkably reduce turbidity of mother liquor (C)<10NTU), but the process needs two-section ceramic microfiltration membranes to purify mother liquor II, so that the final purification process has long flow, high energy consumption and complex operation; in addition, due to the limitation of the existing membrane production technology, the ceramic membrane occupies about 2/3 of the operation cost, and the investment of the device in the early stage of construction is very large. When the membrane made of POLYMER/PV material planted by Michelia Roxiensis GnGanZhong and Hebei Shenghua chemical Limited company in Jiangxi is subjected to purification test, the additive is added in advance to enable Ca in the mother liquor to be Ca2+Precipitating in the form of precipitate, and introducingFiltering with membrane to remove calcium precipitate, wherein the solid particles can be 100% intercepted at the initial stage of filtration, and the filtrate has turbidity<10 NTU; however, the planting membranes have limited capacity in mother liquor filtration (< 1.0 m)3/(m2H)), the loss of active ingredients in the mother liquor is large, and the influence of the impurity content of the inlet mother liquor on the filtration speed is large. When mother liquor II is subjected to adsorptive filtration by using a LAROX purification filter reported in treatise on purification of combined soda mother liquor and improvement of quality of soda ash products, although turbidity and content of water insoluble substances in the mother liquor can be reduced to 10NTU or below 10ppm, the filtering capacity of the filter can only be 0.4-0.8 m3/(m2H) adjustment within the range, the capacity of mother liquor treatment can not meet the requirement of industrial production; patent CN200820026794 provides a combined soda mother liquor purification equipment system, which makes the turbidity variation range of the mother liquor less than 50NTU by adding and controlling the flow of flocculant. By adopting the process, the purification effect of the mother liquor is limited, and in addition, the introduction of the flocculating agent can cause the filtered solid surface to be sticky, so that the difficulty in filtering the crystal slurry liquid at the bottom of the clarifying barrel is increased, and the service cycle of the equipment is reduced.
Therefore, the invention provides a treatment technology for removing calcium, magnesium and other water-insoluble substances in the mother liquor II with low cost and high efficiency so as to reduce the turbidity of the mother liquor II.
Disclosure of Invention
The invention aims to reduce the treatment cost of the mother liquor II, improve the treatment capacity of the mother liquor II and simplify the operation flow, and provides a method and a device for purifying the combined alkali mother liquor II by a PE membrane method, so that the turbidity in the treated mother liquor II is lower than 10NTU, and the requirement of producing high-quality soda products by a combined alkali method is met.
The technical scheme of the invention is as follows:
a PE membrane method purifies and unites the device of alkali mother's II liquid, its characteristic is including hot mother's II liquid bucket 1, magma pump 2, sand filter equipment 3, PE membrane filter equipment 4, filtrate bucket 5, centrifugal pump 6, ammonia absorption process 7, carbonization alkali making process 8, concentrate bucket 9, concentrate pump 10, filter pressing process 11, salting out process 12, compressed air tank 13 and relevant pipeline; hot mother II liquid from the associated alkali enters a hot mother II liquid barrel 1, the outlet of the hot mother II liquid barrel 1 is connected with the inlet at the top of a sand filtration device 3 through a crystal slurry pump 2, the outlet at the bottom of the sand filtration device is connected with the inlet at the bottom of a PE membrane filtration device 4 through a pipeline, and the outlet at the side part of the sand filtration device is connected with the inlet at the side part of a concentrated solution barrel 9 through a pipeline; the bottom of the PE membrane filtering device 4 is provided with an inlet connected with an outlet pipeline of the compressed air tank 13, the side outlet of the PE membrane filtering device 4 is connected with the filtrate barrel 5 through a pipeline, and the bottom outlet of the PE membrane filtering device is connected with the side inlet of the concentrated solution barrel 9 through a pipeline; the outlet of the filtrate barrel 5 is sequentially connected with a centrifugal pump 6, an ammonia absorption process 7 and a carbonization alkali preparation process 8 through pipelines; an outlet pipeline of the centrifugal pump 6 is divided into a branch and is connected with an inlet at the bottom of the sand filtering device 3; the outlet of the concentrated solution barrel 9 is connected with a concentrated solution pump 10 through a pipeline, the outlet pipeline of the concentrated solution pump 10 is divided into two branches, one branch is connected with a filter pressing process 11 through a pipeline, and the other branch is connected with a salting-out process 12 through a pipeline.
The invention provides a method for purifying a combined alkali mother liquor II by a PE (polyethylene) membrane method, which comprises the following steps of:
(1) conveying hot mother liquor II from the combined alkali to a sand filtration device through a mother liquor II barrel under the action of a pump, and filtering to remove particulate matters and oily flocculates with the particle size of more than 1.0 mm;
(2) conveying the mother liquor II filtered by the sand filter device to the bottom of a PE membrane filter device, collecting filtrate filtered by the PE membrane filter device through a filtrate barrel, conveying the filtrate to an ammonia absorption process by a pump, and then conveying the filtrate to a carbonization alkali making process to produce a soda product;
(3) the concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected;
(4) pumping the crystal slurry in the concentrated solution barrel to a filter pressing process, and treating the obtained solid waste and the salt slurry together as common waste; or pumping to salting-out process to produce agricultural ammonium product.
The hot mother liquor in the step (1) is characterized in that: ca2+The concentration is 70-100ppm, Mg2+The concentration is 30-50ppm, the temperature is 27-30 ℃, and the turbidity is 80-130 NTU.
The operation pressure of the PE membrane filtering device in the step (2) is 0.2MPa, and the pore diameter of the PE membrane component is 5-10 um.
And (4) the pressure of the air in the compressed air tank in the step (3) is 0.6 MPa.
Preferably, the sand filtration device is backwashed by using the filtrate after membrane filtration every 12h to remove the trapped substances on the surface of the sand filtration layer, and the backwash liquid is sent to a concentrated solution barrel.
The bottom of the PE membrane filtering device 4 is provided with an inlet connected with a compressed air tank 13, and the PE membrane is aerated and back-flushed by air in the compressed air tank preferably every 2 hours to remove the trapped matters attached to the membrane component and reduce the pressure difference between the inside and the outside of the membrane component.
The pipeline of the concentrated liquid pump 10 is connected with a filter pressing process, and the solid obtained in the filter pressing process and the salt mud are treated as common wastes; the pipeline of the concentrated liquid pump 10 is connected with the salting-out process, and the agricultural ammonium product is obtained mainly by the salting-out process.
The grain size of sand in the sand filtering device in the step (2) is 1.0 mm; the filtrate at the top after being filtered by the PE membrane device is characterized in that: at 27-30 deg.C, turbidity of 4-10NTU, Ca2+The concentration is 20-30ppm, Mg2+The concentration is 10-18 ppm; the optimized processing capacity of the PE membrane filtering device is 1.0-2.0m3/(m2·h)。
The solid volume content in the concentrated solution in the step (3) is more than 40%, and the pressure of air in the compressed air tank is 0.6 MPa.
The sand filtering device is mainly used for removing particulate matters and oily flocculates with larger particle sizes, and avoids the problem that the surface of a PE membrane component is difficult to back flush due to the existence of a small amount of oil stains in the later period.
The concentrated solution is sent to a filter pressing process, and the problem that the concentrated solution goes to the direction when an agricultural ammonium production line stops due to production fluctuation is solved; the raw materials are sent to a salting-out process mainly for improving the utilization rate of the raw materials.
The method has the following advantages:
(1) compared with the method for purifying the mother liquid II by the ceramic membrane, the method has the advantages of simple PE membrane treatment process, simple and convenient operation, low membrane production cost and capability of meeting the production requirement of the turbidity of the mother liquid II after treatment.
(2) And an additive or a flocculating agent is not required to be added in the purification process of the mother liquor II, the operation strength is reduced, and the filtrate is used as a backwash liquid of the sand filtration device, so that the problem of mother liquor expansion is avoided.
(3) The solid in the concentrated solution is effectively treated without generating secondary pollution.
(4) Compared with the LAROX purification filter and the mother liquor II treatment capacity of the planting membrane process, the PE membrane filtering device has the advantage that the treatment capacity is remarkably improved.
Drawings
FIG. 1 is a schematic diagram of a PE membrane purification combined alkali mother liquor II device.
Wherein: 1-hot mother II liquid barrel, 2-crystal slurry pump, 3-sand filter device, 4-PE membrane filter device, 5-filtrate barrel, 6-centrifugal pump, 7-ammonia absorption process, 8-carbonization alkali making process, 9-concentrate barrel, 10-concentrate pump, 11-filter pressing process, 12-salting-out process and 13-compressed air tank.
FIG. 2 shows mother liquor II before and after being treated by the PE membrane method purification combined alkali mother liquor II device.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The device for purifying the combined alkali mother liquor II by the PE membrane method comprises a hot mother liquor II barrel 1, a crystal slurry pump 2, a sand filter device 3, a PE membrane filter device 4, a filtrate barrel 5, a centrifugal pump 6, an ammonia absorption process 7, a carbonization alkali making process 8, a concentrated liquor barrel 9, a concentrated liquor pump 10, a filter pressing process 11, a salting-out process 12, a compressed air tank 13 and related pipelines; hot mother II liquid from the associated alkali enters a hot mother II liquid barrel 1, the outlet of the hot mother II liquid barrel 1 is connected with the inlet at the top of a sand filtration device 3 through a crystal slurry pump 2, the outlet at the bottom of the sand filtration device is connected with the inlet at the bottom of a PE membrane filtration device 4 through a pipeline, and the outlet at the side part of the sand filtration device is connected with the inlet at the side part of a concentrated solution barrel 9 through a pipeline; the bottom of the PE membrane filtering device 4 is provided with an inlet connected with an outlet pipeline of the compressed air tank 13, the side outlet of the PE membrane filtering device 4 is connected with the filtrate barrel 5 through a pipeline, and the bottom outlet of the PE membrane filtering device is connected with the side inlet of the concentrated solution barrel 9 through a pipeline; the outlet of the filtrate barrel 5 is sequentially connected with a centrifugal pump 6, an ammonia absorption process 7 and a carbonization alkali preparation process 8 through pipelines; an outlet pipeline of the centrifugal pump 6 is divided into a branch and is connected with an inlet at the bottom of the sand filtering device 3; the outlet of the concentrated solution barrel 9 is connected with a concentrated solution pump 10 through a pipeline, the outlet pipeline of the concentrated solution pump 10 is divided into two branches, one branch is connected with a filter pressing process 11 through a pipeline, and the other branch is connected with a salting-out process 12 through a pipeline.
The inlet pipeline at the bottom 3 of the sand filtering device is mainly used for backwashing the sand filtering device by using the filtrate after membrane filtration every 12 hours to remove the intercepted matters on the surface of the sand filtering layer;
the bottom of the PE membrane filtering device 4 is provided with an inlet connected with a compressed air tank 13, and the function of the inlet is to perform aeration back flushing on the membrane component by using high-pressure air every 2 hours, remove the trapped matters attached to the membrane component and reduce the pressure difference between the inside and the outside of the membrane component;
the pipeline of the concentrated liquid pump 10 is connected with a filter pressing process, and the solid obtained in the filter pressing process and the salt mud are treated as common waste together.
The pipeline of the concentrated liquid pump 10 is connected with the salting-out process, and the agricultural ammonium obtained in the salting-out process is mainly used as a product for sale.
The invention discloses a method and a device for purifying combined alkali mother liquor II by a PE membrane method, which are shown in the attached drawings and comprise the following steps:
(1) conveying hot mother liquor II from the combined alkali to a sand filtration device through a mother liquor II barrel under the action of a pump, and carrying out primary filtration to remove particulate matters and oily flocculates with larger particle sizes (>1.0 mm);
the hot mother liquor II is characterized in that: ca2+The concentration is 70-100ppm, Mg2+The concentration is 30-50ppm, the temperature is 27-30 ℃, and the turbidity is 80-130 NTU;
(2) conveying the mother liquor II filtered by the sand filter device to the bottom of a PE membrane filter device, collecting filtrate filtered by the PE membrane filter device through a filtrate barrel, conveying the filtrate to an ammonia absorption process by a pump, and then conveying the filtrate to a carbonization alkali making process to produce a soda product; in addition, 1% of the total amount of filtrate is taken every 12 hours and flows into the sand filtration device from the bottom of the sand filtration device to carry out backwashing, and backwashing liquid is sent to a concentrated solution barrel;
the grain size of sand grains in the sand filtering device is 1.0 mm;
the filtrate at the top after being filtered by the PE membrane device is characterized in that: at 27-30 deg.C, turbidity of 4-10NTU, Ca2+The concentration is 20-30ppm, Mg2+The concentration is 10-18 ppm;
the operating pressure of the PE membrane filtering device is 0.2MPa, and the processing capacity is 1.0-2.0m3/(m2H), the aperture of the PE membrane component is 5-10 um;
(3) concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected, and the PE membrane is aerated and back-blown and washed by air in a compressed air tank every 2 hours;
the solid volume content in the concentrated solution is more than 40%, and the pressure of the air in the compressed air tank is 0.6 MPa.
(4) Pumping the crystal slurry in the concentrated solution barrel to a filter pressing process, and treating the obtained solid waste and the salt slurry together as common waste; or pumping to salting-out process to produce agricultural ammonium product.
Example 1
(1) Conveying hot mother liquor II from the combined alkali to a sand filtration device with sand grain size of 1.0mm through a mother liquor II barrel under the action of a pump, and performing primary filtration to remove particulate matters and oily flocculates with larger grain size;
(2) conveying mother liquor II filtered by a sand filtering device to the bottom of a PE membrane filtering device with the aperture of 5 mu m, collecting filtrate at the top after the filtration of the PE membrane by a filtrate barrel, conveying the filtrate to an ammonia absorption process by a pump, conveying the filtrate to a carbonization alkali making process to produce a soda product, taking 1% of the total amount of the filtrate from the bottom of the sand filtering device at intervals of 12 hours, backwashing the device, and conveying backwash liquor to a concentrated liquor barrel;
(3) concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected, and the PE membrane is aerated and back-blown and washed by air in a compressed air tank every 2 hours;
(4) and pumping the crystal slurry in the concentrated solution barrel to a salting-out process to produce an agricultural ammonium product.
Through detection: the temperature before the treatment of the hot mother liquor II was 28 ℃, the turbidity was 80NTU, Ca2+At a concentration of 70ppm, Mg2+The concentration is 30 ppm; the filtrate after passing through the PE membrane filter had a temperature of 28 ℃ and turbidityIs 4NTU, Ca2+Concentration 20ppm, Mg2+The concentration was 10ppm, and the treatment capacity of the PE membrane filter was 1.2m3/(m2H) the solids volume percentage of the concentrate is 50%.
Example 2
(1) Conveying hot mother liquor II from the combined alkali to a sand filtration device with sand grain size of 1.0mm through a mother liquor II barrel under the action of a pump, and performing primary filtration to remove particulate matters and oily flocculates with larger grain size;
(2) conveying mother liquor II filtered by a sand filtering device to the bottom of a PE membrane filtering device with the aperture of 5 mu m, collecting filtrate at the top after the filtration of the PE membrane by a filtrate barrel, conveying most of the filtrate to an ammonia absorption process by a pump, conveying the filtrate to a carbonization alkali making process to produce soda ash products, taking 1% of the total amount of the filtrate from the bottom of the sand filtering device at intervals of 12 hours, backwashing the device, and conveying backwash liquor to a concentrated liquor barrel;
(3) concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected, and the PE membrane is aerated and back-blown and washed by air in a compressed air tank every 2 hours;
(4) and pumping the crystal slurry in the concentrated solution barrel to a filter pressing process, and treating the obtained solid waste and the salt slurry together as common waste.
Through detection: the temperature before the treatment of the hot mother liquor II was 28 ℃, the turbidity was 130NTU, Ca2+At a concentration of 100ppm, Mg2+The concentration is 50 ppm; the filtrate after passing through the PE membrane filter had a temperature of 28 deg.C, a turbidity of 5NTU, Ca2+At a concentration of 25ppm, Mg2+The concentration was 13ppm, and the treatment capacity of the PE membrane filter was 1.0m3/(m2H) the solids volume percentage of the concentrate was 52%.
Example 3
(1) Conveying hot mother liquor II from the combined alkali to a sand filtration device with sand grain size of 1.0mm through a mother liquor II barrel under the action of a pump, and performing primary filtration to remove particulate matters and oily flocculates with larger grain size;
(2) conveying mother liquor II filtered by a sand filtering device to the bottom of a PE membrane filtering device with the aperture of 10 mu m, collecting filtrate at the top after the filtration of the PE membrane by a filtrate barrel, conveying most of the filtrate to an ammonia absorption process by a pump, conveying the filtrate to a carbonization alkali making process to produce soda ash products, taking 1% of the total amount of the filtrate from the bottom of the sand filtering device at intervals of 12 hours, backwashing the device, and conveying backwash liquor to a concentrated liquor barrel;
(3) concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected, and the PE membrane is aerated and back-blown and washed by adopting factory air every 2 hours;
(4) pumping the crystal slurry in the concentrated solution barrel to a filter pressing process, and treating the obtained solid waste and the salt slurry together as common waste; one path of the water is pumped to the salting-out procedure to produce the agricultural ammonium product.
Through detection: the temperature before the treatment of the hot mother liquor II was 30 ℃, the turbidity was 130NTU, Ca2+At a concentration of 100ppm, Mg2+The concentration is 50 ppm; the filtrate after passing through PE membrane filter has a temperature of 30 deg.C, turbidity of 10NTU, and Ca content2+Concentration 30ppm, Mg2 +The concentration was 18ppm and the treatment capacity of the PE membrane filter was 2.0m3/(m2H) the solids volume percentage of the concentrate was 41%.
Example 4
(1) Conveying hot mother liquor II from the combined alkali to a sand filtration device with sand grain size of 1.0mm through a mother liquor II barrel under the action of a pump, and performing primary filtration to remove particulate matters and oily flocculates with larger grain size;
(2) conveying mother liquor II filtered by a sand filtering device to the bottom of a PE membrane filtering device with the aperture of 10 mu m, collecting filtrate at the top after the filtration of the PE membrane by a filtrate barrel, conveying most of the filtrate to an ammonia absorption process by a pump, conveying the filtrate to a carbonization alkali making process to produce soda ash products, taking 1% of the total amount of the filtrate from the bottom of the sand filtering device at intervals of 12 hours, backwashing the device, and conveying backwash liquor to a concentrated liquor barrel;
(3) concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected, and the PE membrane is aerated and back-blown and washed by adopting factory air every 2 hours;
(4) pumping the crystal slurry in the concentrated solution barrel to a filter pressing process, and treating the obtained solid waste and the salt slurry together as common waste; one path of the water is pumped to the salting-out procedure to produce the agricultural ammonium product.
Through detection: the temperature before the treatment of the hot mother liquor II was 27 ℃, the turbidity was 120NTU, Ca2+At a concentration of 90ppm, Mg2+The concentration is 40 ppm; the filtrate after passing through the PE membrane filter had a temperature of 27 deg.C, a turbidity of 8NTU, Ca2+At a concentration of 26ppm, Mg2+The concentration was 15ppm and the treatment capacity of the PE membrane filter was 1.9m3/(m2H) the solids volume percentage of the concentrate was 43%.
Example 5
(1) Conveying hot mother liquor II from the combined alkali to a sand filtration device with sand grain size of 1.0mm through a mother liquor II barrel under the action of a pump, and performing primary filtration to remove particulate matters and oily flocculates with larger grain size;
(2) conveying mother liquor II filtered by a sand filtering device to the bottom of a PE membrane filtering device with the aperture of 8 mu m, collecting filtrate at the top after the filtration of the PE membrane by a filtrate barrel, conveying most of the filtrate to an ammonia absorption process by a pump, conveying the filtrate to a carbonization alkali making process to produce soda ash products, taking 1% of the total amount of the filtrate from the bottom of the sand filtering device at intervals of 12 hours, backwashing the device, and conveying backwash liquor to a concentrated liquor barrel;
(3) concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected, and the PE membrane is aerated and back-blown and washed by adopting factory air every 2 hours;
(4) pumping the crystal slurry in the concentrated solution barrel to a filter pressing process, and treating the obtained solid waste and the salt slurry together as common waste; one path of the water is pumped to the salting-out procedure to produce the agricultural ammonium product.
Through detection: the temperature before the treatment of the hot mother liquor II was 27 ℃, the turbidity was 120NTU, Ca2+At a concentration of 90ppm, Mg2+The concentration is 40 ppm; the filtrate after passing through the PE membrane filter had a temperature of 27 deg.C, a turbidity of 6NTU, Ca2+At a concentration of 23ppm, Mg2+The concentration was 14ppm and the treatment capacity of the PE membrane filter was 1.7m3/(m2H) the solids volume percentage of the concentrate was 45%.
While the methods and techniques of the present invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and/or modifications of the methods and techniques described herein may be made without departing from the spirit and scope of the invention. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and content of the invention.
Claims (7)
1. A device for purifying associated alkali mother liquor II by a PE membrane method is characterized by comprising a hot mother liquor II barrel (1), a crystal slurry pump (2), a sand filtration device (3), a PE membrane filtration device (4), a filtrate barrel (5), a centrifugal pump (6), an ammonia absorption process (7), a carbonization alkali making process (8), a concentrate barrel (9), a concentrate pump (10), a filter pressing process (11), a salting-out process (12), a compressed air tank (13) and related pipelines; hot mother II liquid from the associated alkali enters a hot mother II liquid barrel (1), an outlet of the hot mother II liquid barrel (1) is connected with an inlet at the top of a sand filtration device (3) through a crystal slurry pump (2), an outlet at the bottom of the sand filtration device is connected with an inlet at the bottom of a PE membrane filtration device (4) through a pipeline, and an outlet at the side part of the sand filtration device is connected with an inlet at the side part of a concentrated solution barrel (9) through a pipeline; an inlet connected with an outlet pipeline of the compressed air tank (13) is arranged at the bottom of the PE membrane filtering device (4), an outlet at the side part of the PE membrane filtering device (4) is connected with the filtrate barrel (5) through a pipeline, and an outlet at the bottom of the PE membrane filtering device is connected with an inlet at the side part of the concentrated solution barrel (9) through a pipeline; the outlet of the filtrate barrel (5) is sequentially connected with a centrifugal pump (6), an ammonia absorption process (7) and a carbonization alkali preparation process (8) through pipelines; an outlet pipeline of the centrifugal pump (6) is divided into a branch and is connected with an inlet at the bottom of the sand filtering device (3); the outlet of the concentrated solution barrel (9) is connected with a concentrated solution pump (10) through a pipeline, the outlet pipeline of the concentrated solution pump (10) is divided into two branches, one branch is connected with a filter pressing process (11) through a pipeline, and the other branch is connected with a salting-out process (12) through a pipeline.
2. A method for purifying a combined alkali mother liquor II by a PE membrane method is characterized by comprising the following steps:
(1) conveying hot mother liquor II from the combined alkali to a sand filtration device through a mother liquor II barrel under the action of a pump, and filtering to remove particulate matters and oily flocculates with the particle size of more than 1.0 mm;
(2) conveying the mother liquor II filtered by the sand filter device to the bottom of a PE membrane filter device, collecting filtrate filtered by the PE membrane filter device through a filtrate barrel, conveying the filtrate to an ammonia absorption process by a pump, and then conveying the filtrate to a carbonization alkali making process to produce a soda product;
(3) the concentrated solution at the bottom of the PE membrane filtering device flows through a concentrated solution storage barrel to be collected;
(4) pumping the crystal slurry in the concentrated solution barrel to a filter pressing process, and treating the obtained solid waste and the salt slurry together as common waste; or pumping to salting-out process to produce agricultural ammonium product.
3. The method as set forth in claim 2, characterized in that the hot mother liquor in step (1) is characterized by: ca2+The concentration is 70-100ppm, Mg2+The concentration is 30-50ppm, the temperature is 27-30 ℃, and the turbidity is 80-130 NTU.
4. The method as set forth in claim 2, characterized in that the operating pressure of the PE membrane filtering device in the step (2) is 0.2MPa, and the pore diameter of the PE membrane component is 5-10 um.
5. The method as set forth in claim 2, wherein the pressure of the air in the compressed air tank in the step (3) is 0.6 Mpa.
6. The method as set forth in claim 2, wherein the sand filtration device is backwashed every 12 hours with the filtrate after the membrane filtration to remove the retentate on the surface of the sand filtration layer, and the backwash liquid is sent to the concentrate tank.
7. The method as claimed in claim 2, wherein the PE membrane filtration unit (4) is provided at the bottom thereof with an inlet connected to a compressed air tank (13), and the PE membrane is subjected to aeration back-flushing every 2 hours by using air in the compressed air tank to remove the retentate attached to the membrane module and reduce the pressure difference between the inside and the outside of the membrane module.
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| CN113813660A (en) * | 2021-09-30 | 2021-12-21 | 天津渤化永利化工股份有限公司 | System and method for comprehensively treating ammonia II mud of combined alkali production device |
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| CN113813660A (en) * | 2021-09-30 | 2021-12-21 | 天津渤化永利化工股份有限公司 | System and method for comprehensively treating ammonia II mud of combined alkali production device |
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