CN211226369U - Processing system of miscellaneous salt resourceization - Google Patents
Processing system of miscellaneous salt resourceization Download PDFInfo
- Publication number
- CN211226369U CN211226369U CN201921802090.0U CN201921802090U CN211226369U CN 211226369 U CN211226369 U CN 211226369U CN 201921802090 U CN201921802090 U CN 201921802090U CN 211226369 U CN211226369 U CN 211226369U
- Authority
- CN
- China
- Prior art keywords
- solid
- salt
- organic solvent
- mother liquor
- liquid separation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The utility model discloses a processing system of miscellaneous salt resourceization, include: an organic matter dissolving device, a first solid-liquid separation device, a mixed salt drying device, a mixed salt dissolving device and a salt separating system which are sequentially connected through pipelines; the organic matter dissolving device is used for mixing and stirring the miscellaneous salt to be treated and a first organic solvent, so that the organic matter in the miscellaneous salt to be treated is dissolved in the first organic solvent; a second organic solvent inlet is formed in the first solid-liquid separation device, and is used for introducing a second organic solvent into the first solid-liquid separation device, and the second organic solvent is used for washing solids in the solid-liquid separation process; the first solid-liquid separation device is a centrifugal separation device. The mixed salt recycling treatment system is simple and convenient to operate and easy to industrialize, realizes the recycling of the mixed salt, and reduces the cost of mixed salt treatment.
Description
Technical Field
The utility model relates to a miscellaneous salt field of handling especially relates to a processing system of miscellaneous salt resourceization.
Background
At present, under the double pressure of water resources and environmental problems, a wastewater zero-discharge treatment device is successively built in the traditional coal chemical engineering or petrochemical engineering project. The high-concentration brine obtained after membrane concentration pretreatment of the wastewater is subjected to an evaporative crystallization system to realize zero discharge of the wastewater, and solid crystalline salt, namely miscellaneous salt, is obtained, wherein the miscellaneous salt mainly contains sodium chloride, sodium sulfate, a large amount of organic matters difficult to degrade, and a very small amount of substances such as sodium nitrate, sodium carbonate and the like. The mixed salt is continuously generated along with the production process, has the characteristics of complex components, large quantity, strong pollution and the like, and directly influences the high-efficiency operation of production enterprises. In addition, a large amount of mixed salt accumulated when environmental protection policy is relaxed causes serious environmental pollution and ecological damage.
The traditional mixed salt treatment mode is mainly landfill, and the treatment mode has high treatment cost, occupies a large amount of land resources and can cause pollution to underground water and soil. According to the adjustment of national environmental protection policy, the miscellaneous salt produced by the zero-emission process is defined as hazardous waste, namely dangerous waste. The treatment difficulty of hazardous wastes is higher, the treatment qualification requirement is higher, and the treatment cost is higher. Dangerous waste treatment has become a bottleneck restricting enterprise development at present, and needs to be solved urgently. Therefore, the utility model aims at developing a can further separate miscellaneous salt, obtain the crystalline salt that quality is good, purity is high, and the crystalline salt satisfies low reaches utilization requirement, realizes the utilization of miscellaneous salt as a resource and the zero release. Meanwhile, the crystallized salt generated by the resource utilization of the miscellaneous salt is sold, and good economic and social benefits can be brought to enterprises.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a treatment system for recycling mixed salt, aiming at the technical problems of difficult treatment and high cost of the mixed salt.
A treatment system for recycling mixed salt comprises: an organic matter dissolving device, a first solid-liquid separation device, a mixed salt drying device, a mixed salt dissolving device and a salt separating system which are sequentially connected through pipelines;
the organic matter dissolving device is used for mixing and stirring the miscellaneous salt to be treated and a first organic solvent, so that the organic matter in the miscellaneous salt to be treated is dissolved in the first organic solvent; a second organic solvent inlet is formed in the first solid-liquid separation device and used for introducing a second organic solvent into the first solid-liquid separation device, and the second organic solvent washes solids in the solid-liquid separation process; the first solid-liquid separation device is a centrifugal separation device.
In one embodiment, the centrifugal separation device is a centrifuge.
In one embodiment, the miscellaneous salt drying device is a fluidized bed dryer, and a volatile gas outlet is arranged on the fluidized bed dryer and used for outputting volatile gas generated in the drying process.
In one embodiment, the device further comprises an organic solvent recovery device, wherein an inlet of the organic solvent recovery device is respectively connected with a mother liquid outlet of the solid-liquid separation device and a volatile gas outlet of the fluidized bed dryer; and the outlet of the organic solvent recovery device is connected with the solvent inlet of the organic matter dissolving device and the solvent inlet of the solid-liquid separation device, and the organic solvent recovered by the organic solvent recovery device is reused in the treatment system.
In one embodiment, the first organic solvent and the second organic solvent are each independently selected from methanol, ethanol, or a mixed solvent thereof.
In one embodiment, the salt separating system comprises a sodium chloride crystallization unit and a sodium sulfate crystallization unit, and an outlet of the miscellaneous salt dissolving device is connected with the sodium chloride crystallization unit through a first pipeline and connected with the sodium sulfate crystallization unit through a second pipeline.
In one embodiment, a main pipeline is arranged between the outlet of the miscellaneous salt dissolving device and the position where the first pipeline and the second pipeline are connected, and a first ion concentration detection device is arranged on the main pipeline and is used for detecting the concentration of chloride ions and the concentration of sulfate ions.
In one embodiment, the sodium chloride crystallization unit comprises a sodium chloride evaporative crystallization device, a second solid-liquid separation device and a sodium chloride drying device which are sequentially connected through pipelines, wherein the second solid-liquid separation device is provided with a second solid outlet and a second mother liquor outlet, the second solid outlet is connected with the sodium chloride drying device through a pipeline, and the second mother liquor outlet is respectively connected with the first pipeline, the second pipeline and a mother liquor recovery device through different pipelines; and a second ion detection device is arranged at the second mother liquor outlet and is used for detecting the concentration of nitrate ions, chloride ions and sulfate ions in the mother liquor discharged from the second mother liquor outlet.
In one embodiment, the sodium sulfate crystallization unit comprises a freezing crystallization device, a third solid-liquid separation device, a melting crystallization device, a fourth solid-liquid separation device and a sodium sulfate drying device which are sequentially connected through pipelines, wherein the third solid-liquid separation device is provided with a third solid outlet and a third mother liquid outlet, the third solid outlet is connected with the melting crystallization device through a pipeline, and the third mother liquid outlet is respectively connected with the first pipeline, the second pipeline and a mother liquid recovery device through different pipelines; and a third ion detection device is arranged at the third mother liquor outlet and is used for detecting the concentration of nitrate ions, chloride ions and sulfate ions in the mother liquor discharged from the third mother liquor outlet.
The utility model provides a treatment system for recycling miscellaneous salt, which is provided with an organic matter dissolving device and adopts a first organic solvent to dissolve organic matters in miscellaneous salt and remove the organic matters on the solid surface of miscellaneous salt; meanwhile, a second organic solvent inlet is arranged on the solid-liquid separation device, so that in addition to the step of mixing and stirring the mixed salt and the first organic solvent to remove part of the organic matters, the second organic solvent is introduced into the solid-liquid separation device to wash the solid subjected to solid-liquid separation, so that more organic matters are further removed; in addition, in the drying process of the miscellaneous salt drying device, organic solvents and organic matters on the surface of the solid are further removed, and most of the organic matters in the miscellaneous salt can be removed by combining a plurality of devices, so that better conditions are provided for the subsequent salt separation operation. The utility model provides a processing system of miscellaneous salt resourceization, easy operation makes things convenient for easily industrialization, can realize having reduced the cost that miscellaneous salt was handled to the utilization of miscellaneous salt.
Drawings
FIG. 1 is a schematic structural diagram of a miscellaneous salt recycling system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a processing method for recycling mixed salt in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail by the following embodiments in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The utility model discloses in chloride ion concentration, sulfate ion concentration and nitrate ion concentration all refer to the mass concentration of ion.
As shown in fig. 1, which is a schematic structural diagram of a mixed salt recycling treatment system in an embodiment of the present invention, the mixed salt recycling treatment system includes an organic matter dissolving device 100, a first solid-liquid separation device 200, a mixed salt drying device 300, a mixed salt dissolving device 400, and a salt separating system 500, which are sequentially connected through a pipeline;
the organic matter dissolving device 100 is used for mixing and stirring the miscellaneous salt to be treated and a first organic solvent, so that the organic matter in the miscellaneous salt to be treated is dissolved in the first organic solvent; a second organic solvent inlet is formed in the first solid-liquid separation device 200, and is used for introducing a second organic solvent into the first solid-liquid separation device 200, and the second organic solvent is used for washing solids in the solid-liquid separation process; the first solid-liquid separation device 200 is a centrifugal separation device.
In one embodiment, the organic dissolving apparatus 100 includes a stirrer, and the solid-liquid mixture is stirred by the stirrer.
In one embodiment, the first solid-liquid separation device 200 can be a centrifuge, a filter press, a dehydrator, or other equipment with similar functions. Preferably, the solid-liquid separation device is a centrifuge, wherein the centrifuge continuously operates, a second organic solvent is introduced into the centrifuge to wash the solid in the centrifugation process, and finally the separated solid and the separated mother liquor are obtained after solid-liquid separation. The centrifuge is simple and convenient to operate, the second organic solvent is introduced into the centrifuge, the solid in the centrifuging process is washed, and the washed solid can be centrifuged again due to continuous operation of the centrifuge, so that the final separated solid and separated mother liquor are obtained; the second solvent washes the solids to further reduce the organic content of the miscellaneous salts.
In a preferred embodiment, the miscellaneous salt drying device 300 is a fluidized bed dryer, and the fluidized bed dryer 300 is provided with a volatile gas outlet, and the volatile gas outlet is used for outputting volatile gas generated in the drying process.
In a preferred embodiment, the processing system for recycling mixed salt further comprises an organic solvent recovery device 600, wherein a solvent inlet of the organic solvent recovery device 600 is respectively connected with a mother liquor outlet of the first solid-liquid separation device 200 and a volatile gas outlet of the mixed salt drying device 300; the solvent outlet of the organic solvent recovery apparatus 600 is connected to the solvent inlet of the organic solvent dissolving apparatus 100 and the solvent inlet of the first solid-liquid separating apparatus 200, respectively. Wherein the organic solvent recovery device 600 can be a rectifying tower, a condenser and other devices with similar functions.
In one embodiment, the miscellaneous salt drying device 300 is a fluid bed dryer, a tray dryer, or other equipment with similar functionality. Preferably, the miscellaneous salt drying device 300 is a fluidized bed dryer. The fluidized bed dryer has better continuity in operation and is more suitable for continuous production. The gas generated in the fluidized bed dryer is introduced into the organic solvent recovery apparatus 600 through a pipe seal. The gas generated in the miscellaneous salt drying device 300 enters the organic solvent recovery device 600 through a pipeline to recover the organic solvent.
In an embodiment, the salt separating system 500 includes a sodium chloride crystallization unit and a sodium sulfate crystallization unit, and an outlet of the miscellaneous salt dissolving device 400 is connected to the sodium chloride crystallization unit through a first pipeline and connected to the sodium sulfate crystallization unit through a second pipeline. The salt separation route where the first pipeline and the sodium chloride crystallization unit are located is a first route, and the salt separation route where the second pipeline and the sodium sulfate crystallization unit are located is a second route.
In one embodiment, a main pipeline is disposed between the outlet of the miscellaneous salt dissolving device 400 and the connection position of the first pipeline and the second pipeline, and a first ion concentration detection device is disposed on the main pipeline and is used for detecting the concentration of chloride ions and the concentration of sulfate ions.
According to different ratios of the chloride ion concentration and the sulfate ion concentration in the salt solution in the mixed salt dissolving device 400, the salt solution enters different salt separating units through different routes. When the ratio of the concentration of chloride ions to the concentration of sulfate ions is more than or equal to 4:1, enabling the salt solution to enter a first route through a first pipeline, and crystallizing sodium chloride; when the concentration ratio of the chloride ions to the sulfate ions is less than 4:1, the salt solution enters a second route through a second pipeline to crystallize the sodium sulfate.
In one embodiment, valves are respectively arranged on the first pipeline and the second pipeline, and the salt solution is selectively introduced into the first route or the second route through the opening and closing of the valves, so that the switching between sodium chloride crystallization and sodium sulfate crystallization is realized. Further, the opening and closing of the valve can be automatically controlled.
In an embodiment, the sodium chloride crystallization unit comprises a sodium chloride evaporative crystallization device 511, a second solid-liquid separation device 512 and a sodium chloride drying device 513 which are sequentially connected through pipelines, wherein the second solid-liquid separation device 512 is provided with a second solid outlet and a second mother liquor outlet, the second solid outlet is connected with the sodium chloride drying device through a pipeline, and the second mother liquor outlet is respectively connected with the first pipeline, the second pipeline and the mother liquor recovery device through different pipelines; and a second ion detection device is arranged at the second mother liquor outlet and is used for detecting the concentration of nitrate ions, chloride ions and sulfate ions in the mother liquor discharged from the second mother liquor outlet. The connection of the second mother liquor outlet to the second line via a line is only illustrated in fig. 1, and other connections of the second mother liquor outlet will be unambiguously understood by the person skilled in the art from the above.
In one embodiment, the sodium sulfate crystallization unit comprises a freezing crystallization device 521, a third solid-liquid separation device 522, a melt crystallization device 523, a fourth solid-liquid separation device 524 and a sodium sulfate drying device 525 which are connected in sequence through pipelines; the third solid-liquid separation device 522 is provided with a third solid outlet and a third mother liquor outlet, the third solid outlet is connected with the melt crystallization device through a pipeline, and the third mother liquor outlet is respectively connected with the first pipeline, the second pipeline and the mother liquor recovery device through different pipelines; and a third ion detection device is arranged at the third mother liquor outlet and is used for detecting the concentration of nitrate ions, chloride ions and sulfate ions in the mother liquor discharged from the third mother liquor outlet. The fourth solid-liquid separation device 524 is provided with a fourth solid outlet and a fourth mother liquor outlet, the fourth solid outlet is connected with the sodium sulfate drying device 525 through a pipeline, and the fourth mother liquor outlet (not shown in the figure) is connected to a mother liquor recovery device. The connection of the third mother liquor outlet to the first line via a line is only illustrated in fig. 1, and other connections of the third mother liquor outlet will be unambiguously understood by the person skilled in the art from the above.
The second ion detection device and the third ion detection device respectively detect the concentration of nitrate ions in the mother liquor discharged from the sodium chloride evaporative crystallization device 511 and the mother liquor discharged from the freezing crystallization device 521, determine whether the nitrate ions need to be further separated into salts according to the concentration of the nitrate ions, and if the nitrate ions do not need to be further separated into salts, the mother liquor discharged from the sodium chloride evaporative crystallization device 511 and the mother liquor discharged from the freezing crystallization device 521 enter a mother liquor recovery device; if further salt separation is needed, the salt separation is carried out according to the ratio of the chloride ion concentration and the sulfate ion concentration in the salt separation solution.
In an embodiment, wherein the mother liquor recovery device is used for crystallizing and separating out the mixed salt from the mother liquor, the mother liquor recovery device is preferably a mother liquor drier.
In addition, the utility model also comprises a power device, for example, a first pump 700 can be arranged between the mixed salt dissolving device 400 and the salt separating system, and a second pump 526 can be arranged between the third solid-liquid separating device 522 and the melting crystallizing device 523; other conventional devices such as necessary valves, etc. can be set by those skilled in the art according to the needs, and are not described herein.
As shown in fig. 2, which is a schematic flow chart of a processing method for recycling mixed salt in an embodiment of the present invention, the processing method for recycling mixed salt includes the following steps:
s10: mixing and stirring the initial mixed salt and a first organic solvent to obtain a solid-liquid mixture;
s20: carrying out solid-liquid separation on the solid-liquid mixture, washing the solid by using a second organic solvent in the process of carrying out solid-liquid separation, and finally carrying out solid-liquid separation to obtain a separated solid and a separated mother liquor;
s30: drying the separated solid to obtain a dried solid;
s40: dissolving the dried solid with water to obtain a salt solution; and
s50: and carrying out salt separation crystallization on the salt solution to obtain different crystalline salts.
In the traditional method for recycling mixed salt, firstly, an organic solvent is adopted to wash the mixed salt to remove organic matters in the mixed salt; then, the solid washed by the organic solvent is washed by brine to dissolve part of salt in the solid, and the washing simplifies the treatment mode of the mixed salt. However, in the traditional method, because the removal rate of organic matters in the miscellaneous salts in the organic solvent washing step is only 50% -70%, the COD in the salt solution obtained by washing the salt water is high, and the salt solution needs to be subjected to catalytic oxidation treatment by a high-grade oxidation system to reduce the COD, the treatment step is complex, the removal rate of the organic matters in the miscellaneous salts is low, the catalytic oxidation treatment greatly increases the treatment cost of removing the organic matters while improving the removal efficiency of the organic matters, and indirectly increases the cost of treating the miscellaneous salts. The catalytic oxidation technology has certain limitation on the removal of organic matters, and the removal rate of COD is only about 50% generally.
In the embodiment, by using the principle that organic matters are similar to and compatible with an organic solvent, the organic matters in the miscellaneous salt are completely dissolved and transferred into the organic solvent through a plurality of steps, the removal rate of organic pollutants reaches over 95 percent, and salt ions are not affected, so that the purity of crystal salt obtained by recycling miscellaneous salt in the subsequent salt separation process is well ensured, and the method is a creative method for recycling miscellaneous salt in the chemical field. Wherein step S20 can be repeated to achieve better effect of removing organic matters in the miscellaneous salt.
In one embodiment, in step S10, a stirrer is used for stirring, wherein the rotation speed of the stirrer is 50-200rpm, and the stirring and dissolving time is 10-60 min.
In one embodiment, wherein in the step S10, the volume of the first organic solvent is 3-5 times of the volume of the initial heterosalt, in the step S20, the volume of the second organic solvent is 2-3 times of the volume of the initial heterosalt. This embodiment carries out reasonable design to the quantity of first organic solvent and second organic solvent, when guaranteeing organic matter removal effect in the initial miscellaneous salt, practices thrift the solvent, reduce cost.
In a preferred embodiment, the first organic solvent and the second organic solvent are each independently selected from methanol, ethanol, or a mixed solvent thereof. The methanol and the ethanol are volatile solvents, so that the organic solvent attached to the surface of the separated solid in the subsequent drying of the mixed salt is easy to remove, and the removal effect of the organic matters in the mixed salt is further ensured. Further, the first organic solvent and the second organic solvent are the same solvent. Further preferably, the first organic solvent and the second organic solvent are both ethanol, which is less toxic than methanol and more environmentally friendly. The single solvent is simple and convenient to use, the solvent is convenient to recycle, and the production cost is reduced. Certainly, the first organic solvent and the second organic solvent may be a mixed solvent of methanol and ethanol, and the mixed solvent may generate relatively high solubility for different organic matters, so as to improve the removal efficiency of the organic matters.
In one embodiment, in step S20, solid-liquid separation is performed by centrifugation, the second organic solvent is added during centrifugation to wash the solid, and finally, after centrifugation, a separated solid and a separation mother liquor are obtained. The continuous operation centrifugal treatment is adopted for solid-liquid separation, so that organic solvent washing and solid-liquid separation can be realized in the same step, a plurality of operations are completed simultaneously in a single step, and the method is simple, convenient and easy to industrialize.
In one embodiment, an organic solvent recovery step is further included, wherein the first organic solvent and the second organic solvent are separated from the separation mother liquor and then recycled in steps S10 and S20, respectively.
In a preferred embodiment, the organic solvent recovery step further comprises: in step S30, the organic solvent adhering to the surface of the separated solid is volatilized to generate a gas, and the organic solvent is separated from the gas and recovered. The organic solvent for separating the solid surface is the second organic solvent and/or the first organic solvent. The organic solvent recycling step is arranged, so that the organic solvent is recycled, resources are saved, and the cost is reduced.
In one embodiment, all of the initial hetero-salts contain chloride, sulfate, nitrate and sodium ions, and the fractional salt crystallization in step S50 includes:
carrying out chloride ion and sulfate ion concentration detection on the salt solution;
according to the comparison result of the ratio of the chloride ion concentration to the sulfate ion concentration and a preset ratio, carrying out sodium sulfate crystallization or sodium chloride crystallization on the salt solution to obtain sodium sulfate crystalline salt or sodium chloride crystalline salt and crystallized mother liquor;
detecting the concentration of nitrate ions in the mother liquor after the crystallization of the sodium sulfate crystals or the sodium chloride crystals; and
and according to the comparison result of the concentration of the nitrate ions and the preset concentration, carrying out salt separation crystallization on the crystallized mother liquor or carrying out crystallization separation treatment on the crystallized mother liquor to obtain mixed salt.
In a preferred embodiment, in step S50, wherein the predetermined ratio is 4:1,
when the ratio of the concentration of chloride ions to the concentration of sulfate ions is more than or equal to 4:1, carrying out sodium chloride crystallization on the salt solution;
when the ratio of chloride ion concentration to sulfate ion concentration is < 4:1, sodium sulfate crystallization is performed on the salt solution.
In a preferred embodiment, in step S50, the preset concentration is 218g/L,
when the concentration of nitrate ions in the crystallized mother liquor is less than 218g/L, carrying out salt separation crystallization on the crystallized mother liquor;
and when the concentration of nitrate ions in the crystallized mother liquor is more than or equal to 218g/L, crystallizing and separating out the crystallized mother liquor to obtain the mixed salt.
In the step of salt separation crystallization, detection of chloride ion concentration and sulfate ion concentration is set, and different crystallization operations are performed according to different ratios of chloride ion concentration to sulfate ion concentration in a salt solution or a mother solution after crystallization, so that the purity of crystallized salt obtained by crystallization is higher. Further, in this embodiment, the detection of the concentration of the nitrate ions is provided, and whether the salt separation crystallization operation is continued or the salt separation crystallization is ended is determined according to the concentration of the nitrate ions; if the solution is subjected to salt separation crystallization when the concentration of nitrate ions in the solution is too high, the purity of sodium chloride crystal salt or sodium sulfate crystal salt obtained by crystallization is reduced, so that the high-purity crystal salt is difficult to obtain; the detection setting of the nitrate ion concentration ensures the purity of the crystal salt of the salt separation crystal.
In a preferred embodiment, the sodium sulfate crystallization step comprises: freezing and crystallizing the salt solution or the crystallized mother solution at 0-5 ℃, and crystallizing and separating out sodium sulfate in a mirabilite form; carrying out solid-liquid separation to obtain mirabilite solid and frozen crystallization mother liquor; and carrying out melt crystallization on the mirabilite solid at the temperature of 90 ℃ and under the pressure of-80 kPa to obtain the sodium sulfate crystalline salt.
In a preferred embodiment, the sodium chloride crystallization step comprises: carrying out sodium chloride evaporation crystallization on the salt solution or the crystallized mother liquor at the temperature of 95 ℃ and the pressure of-70 kPa to produce sodium chloride crystal salt and part of miscellaneous salt solid; and carrying out solid-liquid separation to obtain sodium chloride crystal salt, partial miscellaneous salt solid and sodium chloride evaporation crystallization mother liquor.
The following describes in detail an embodiment of the treatment method for recycling mixed salt in the present application, with reference to the mixed salt produced in a certain zero-emission project as an example.
Example 1
The method comprises the following steps of (1) carrying out primary detection on the mixed salt before treatment, wherein the mass concentration of each component in the mixed salt is as follows: sodium sulfate: 332.1g/kg, sodium chloride: 322.6g/kg, sodium nitrate: 182.4g/kg, COD: 161.9g/kg, others: 0.8g/kg, water content: 0.2% (water accounts for the mass percent of the miscellaneous salt before treatment).
(1) Conveying the miscellaneous salt into an organic dissolving device 100, wherein the feeding amount is 342.1kg/h, feeding ethanol into the organic dissolving device 100 in the adding amount of 600L/h, setting the rotating speed of a stirrer to be 100rpm, stirring by the stirrer to dissolve organic pollutants in the miscellaneous salt, and the retention time of the mixture of the miscellaneous salt and the organic solvent in an organic solvent dissolving pool is 60 min;
(2) the mixture of the miscellaneous salt and the organic solvent enters a solid-liquid separation device 200 through a pipeline, in the centrifugal process, fresh ethanol is introduced into the first solid-liquid separation device 200 at the adding amount of 500L/h to wash the solid, the centrifugal machine continuously operates, and finally, the separated solid and the separated mother liquor are obtained after centrifugal separation;
(3) after passing through the first solid-liquid separation device 200, the separated mother liquor in which a large amount of organic pollutants are dissolved is sent to an organic solvent recovery device 600 through a sealed pipeline, so that the organic solvent is recovered and reused; the separated solid enters a miscellaneous salt dryer 300 through a pipeline to be dried to obtain a dried solid, and gas generated by drying is sent into an organic solvent recovery device 600 through a pipeline in a sealing way; after the steps, the organic pollutants and the organic solvent in the mixed salt are further removed.
(4) The dried solid enters the miscellaneous salt dissolving device 400 through a pipeline, and clean water is introduced into the miscellaneous salt dissolving device 400 to ensure that the dried solid is completely dissolved to obtain a salt solution; the introduction speed of the clean water is 1.4m3The dissolving and staying time is 1h, and the mass concentration of the salt solution formed after the miscellaneous salt is completely dissolved is 204.6 g/L;
(5) and detecting the concentration of chloride ions and sulfate ions in the salt solution, wherein the ratio of the concentration of the chloride ions to the concentration of the sulfate ions is 0.9:1 and less than 4: 1.
Pumping the salt solution into a second route, firstly entering a freezing and crystallizing device 521, setting the freezing temperature to be 0-5 ℃, and at a low temperature, using sodium sulfate (Na) as mirabilite2SO4·10H2O) form is crystallized.
(6) And pumping the obtained mirabilite into a melting crystallization device 522 for further purification, setting the evaporation temperature to be 90 ℃ and the pressure to be-80 kPa, and obtaining the high-quality sodium sulfate crystal salt. The yield of the sodium sulfate crystal salt is 121.5kg/h, the water content is 15 percent through measurement, the yield is 103.3kg/h in terms of pure sodium sulfate, and the purity (dry basis) of the sodium sulfate reaches 99.4 percent.
And (3) detecting the concentration of chloride ions and sulfate ions in the mother liquor from the freezing crystallization device 521, wherein the concentration ratio of the chloride ions to the sulfate ions is 9.6:1 and is more than 4:1, introducing the mother liquor into a sodium chloride evaporation crystallization device 510, setting the evaporation temperature to be 95 ℃ and the pressure to be-70 kPa, and obtaining the high-quality sodium chloride crystal salt. The yield of the sodium chloride crystal salt is 102kg/h, the water content is 15 percent through measurement, the yield of the sodium chloride which is converted into pure sodium chloride is 86.7kg/h, and the purity (dry basis) of the sodium chloride reaches 99.8 percent;
(7) and (3) detecting the concentration of nitrate ions in the residual mother liquor in the sodium chloride evaporative crystallization device 510, wherein the concentration of the nitrate ions is 256.0g/L and is more than 218g/L, ending the crystallization operation, introducing the residual mother liquor into a mother liquor drier, and heating to obtain the impurity salt with the yield of 152.1 kg/h.
In the embodiment, the content of the miscellaneous salt is reduced by about 50%, so that the cost of miscellaneous salt treatment is reduced, high-quality sodium chloride crystals and sodium sulfate crystals are produced, and the resource utilization of the miscellaneous salt is realized.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A treatment system for recycling mixed salt is characterized by comprising: an organic matter dissolving device, a first solid-liquid separation device, a mixed salt drying device, a mixed salt dissolving device and a salt separating system which are sequentially connected through pipelines;
the organic matter dissolving device is used for mixing and stirring the miscellaneous salt to be treated and a first organic solvent, so that the organic matter in the miscellaneous salt to be treated is dissolved in the first organic solvent; a second organic solvent inlet is formed in the first solid-liquid separation device, and is used for introducing a second organic solvent into the first solid-liquid separation device, and the second organic solvent is used for washing solids in the solid-liquid separation process; the first solid-liquid separation device is a centrifugal separation device.
2. The processing system of claim 1, wherein the centrifugal separation device is a centrifuge.
3. The processing system according to claim 1, wherein the miscellaneous salt drying device is a fluidized bed dryer, and a volatile gas outlet is arranged on the fluidized bed dryer and is used for outputting volatile gas generated in the drying process.
4. The treatment system of claim 3, further comprising an organic solvent recovery device, an inlet of the organic solvent recovery device being connected to the mother liquor outlet of the first solid-liquid separation device and the volatile gas outlet of the fluidized bed dryer, respectively; and the outlet of the organic solvent recovery device is connected with the solvent inlet of the organic matter dissolving device and the solvent inlet of the first solid-liquid separation device, and the organic solvent recovered by the organic solvent recovery device is reused in the treatment system.
5. The treatment system of claim 1, wherein the salt separation system comprises a sodium chloride crystallization unit and a sodium sulfate crystallization unit, and an outlet of the miscellaneous salt dissolving device is connected with the sodium chloride crystallization unit through a first pipeline and connected with the sodium sulfate crystallization unit through a second pipeline.
6. The treatment system according to claim 5, wherein a main line is provided between the outlet of the miscellaneous salt dissolving device and a position where the first line and the second line are connected, and a first ion concentration detection device for detecting a chloride ion concentration and a sulfate ion concentration is provided on the main line.
7. The treatment system according to claim 5, wherein the sodium chloride crystallization unit comprises a sodium chloride evaporative crystallization device, a second solid-liquid separation device and a sodium chloride drying device which are sequentially connected through pipelines, wherein the second solid-liquid separation device is provided with a second solid outlet and a second mother liquor outlet, the second solid outlet is connected with the sodium chloride drying device through a pipeline, and the second mother liquor outlet is respectively connected with the first pipeline, the second pipeline and a mother liquor recovery device through different pipelines; and a second ion detection device is arranged at the second mother liquor outlet and is used for detecting the concentration of nitrate ions, chloride ions and sulfate ions in the mother liquor discharged from the second mother liquor outlet.
8. The treatment system according to claim 5, wherein the sodium sulfate crystallization unit comprises a freezing crystallization device, a third solid-liquid separation device, a melting crystallization device, a fourth solid-liquid separation device and a sodium sulfate drying device which are connected in sequence through pipelines, wherein the third solid-liquid separation device is provided with a third solid outlet and a third mother liquor outlet, the third solid outlet is connected with the melting crystallization device through a pipeline, and the third mother liquor outlet is respectively connected with the first pipeline, the second pipeline and a mother liquor recovery device through different pipelines; and a third ion detection device is arranged at the third mother liquor outlet and is used for detecting the concentration of nitrate ions, chloride ions and sulfate ions in the mother liquor discharged from the third mother liquor outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921802090.0U CN211226369U (en) | 2019-10-24 | 2019-10-24 | Processing system of miscellaneous salt resourceization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921802090.0U CN211226369U (en) | 2019-10-24 | 2019-10-24 | Processing system of miscellaneous salt resourceization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211226369U true CN211226369U (en) | 2020-08-11 |
Family
ID=71942177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921802090.0U Active CN211226369U (en) | 2019-10-24 | 2019-10-24 | Processing system of miscellaneous salt resourceization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211226369U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110902698A (en) * | 2019-10-24 | 2020-03-24 | 内蒙古久科康瑞环保科技有限公司 | Treatment method and system for recycling mixed salt |
-
2019
- 2019-10-24 CN CN201921802090.0U patent/CN211226369U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110902698A (en) * | 2019-10-24 | 2020-03-24 | 内蒙古久科康瑞环保科技有限公司 | Treatment method and system for recycling mixed salt |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206359377U (en) | The special equipment of the separation of salt and crystallization process for reclaiming in brine waste | |
| CN109019634B (en) | Chemical waste salt refining and resource utilization system and method | |
| WO2017121343A1 (en) | Process for recovering lithium from industrial wastewater | |
| CN211226369U (en) | Processing system of miscellaneous salt resourceization | |
| CN105152449A (en) | Zero discharge treatment process of desulfurization wastewater in coking industry | |
| CN109912096A (en) | A kind of pretreated method of o-methyl formate benzene sulfonamide waste water sub-prime | |
| CN103785286A (en) | Magnesium type flue gas desulfurization process for recovering magnesium sulfate heptahydrate | |
| CN113233798A (en) | Cement kiln dust/fly ash washing salt extraction treatment system and use method thereof | |
| CN214570788U (en) | High basicity strong brine zero release processing system | |
| CN110902698A (en) | Treatment method and system for recycling mixed salt | |
| CN103979578B (en) | A kind of novel process preparing Sodium Thiocyanate 99 | |
| CN103979577B (en) | A kind of coking desulfurization mixed salt extracts the method for sodium sulfocyanate | |
| CN111153417B (en) | Comprehensive treatment device for separating salt from waste salt | |
| CN219507692U (en) | Organic wastewater treatment system containing salt | |
| CN114249339B (en) | Salt separating method and system for electrolytic manganese electrolyte salt slag | |
| CN105482152B (en) | Silicon chip dicing waste mortar washes recovery system and method | |
| CN111715664A (en) | Treatment method for recycling carbonized industrial waste salt | |
| CN107597795B (en) | System and method for recycling and treating household garbage incineration fly ash | |
| CN113955772B (en) | Separation and purification method of fly ash water-washed soluble chloride salt | |
| CN111375230A (en) | Washing concentration environment-friendly separation equipment | |
| JP2009207982A (en) | Method of recovering phosphorus extract | |
| CN205152126U (en) | Refined system of thick product of p toluene sulfonyl chloride | |
| CN212198525U (en) | Comprehensive treatment device for waste salt separation | |
| CN108217698B (en) | Method for recovering lithium from PPS (polyphenylene sulfite) catalyst waste residue | |
| CN107309263B (en) | High concentration, complete circulation type soil, in solid waste pollutant chemical leaching separation method and its separation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |