CN115140750A - Method for classifying and extracting single chloride solution from fly ash washing mixed salt wastewater - Google Patents
Method for classifying and extracting single chloride solution from fly ash washing mixed salt wastewater Download PDFInfo
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- CN115140750A CN115140750A CN202210673182.3A CN202210673182A CN115140750A CN 115140750 A CN115140750 A CN 115140750A CN 202210673182 A CN202210673182 A CN 202210673182A CN 115140750 A CN115140750 A CN 115140750A
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- salt
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/32—Purification
Abstract
The invention discloses a method for classifying and extracting single chlorine salt solution from fly ash washing mixed salt wastewater, and relates to the field of fly ash treatment. The method comprises the following steps: precooling original wastewater, introducing cold energy generated by separating ice crystals from subsequent crystal separation freezing and salt separation into a mixed salt wastewater pipeline system to precool the mixed salt wastewater, and well recycling residual cold of the system; and step two, performing crystal separation and salt separation, and separating three different chloride salts at different eutectic point temperatures through three rounds of crystal separation and freezing. The invention relates to a method for classifying and extracting single chlorine salt solution from fly ash washing mixed salt wastewater, which adopts freezing to replace evaporation and crystallization to replace fractional distillation to separate single chlorine salt from mixed salt water, is a subversive innovation of the traditional method, technically solves the difficulty of fly ash disposal and utilization, and economically reduces 30-60 percent of energy consumption, equipment cost, equipment maintenance and loss compared with the traditional method.
Description
Technical Field
The invention belongs to the field of fly ash treatment, and particularly relates to a method for classifying and extracting single chloride solution from fly ash washing mixed salt wastewater.
Background
The incineration power generation solves the problems of reduction and resource utilization of household garbage, promotes the process of a waste-free city, secondarily controls the dangerous waste of fly ash, has mature technology for controlling the heavy metal and dioxin, and has technical bottleneck for treating the chloride ions which are not harmful. Although the fly ash is supported by policy with great force, the treatment and utilization of the fly ash are still difficult to promote, and researches show that the control of the content of chloride ions in the fly ash is not difficult, the existing washing technology can sufficiently solve the problem that how to treat the fly ash water washing to generate high-chlorine mixed salt wastewater, the high-chlorine wastewater cannot be discharged at will, and otherwise underground water and soil can be damaged. Some people discharge after dilution, so 10-20 times of water fly ash is used for water washing, but the objectively existing chlorine salt still enters underground water and soil, thereby not only wasting valuable water resources but also spoiling salt resources in waste water. They are also dehydrated, dried and crystallized, but new mixed salt solid wastes which are more difficult to dispose and utilize are generated, a large amount of energy is wasted, and the method becomes a new pain point for environmental management. Therefore, the fly ash chelated by the power plant is still accumulated in a warehouse, and the cooperative treatment of the fly ash and the cement kiln by the cement plant is really negative, so that the actual consumption rate is extremely low.
In order to help a power plant to get rid of the predicament of fly ash surrounding the plant and effectively improve the consumption of fly ash by cement kiln cooperative treatment, a conventional thought is hoped to be broken through, the essence of the problem is mastered, scientific and technological resources are mobilized, a new method with small investment, low energy consumption and low cost is found by applying an innovative technology, the worries of fly ash washing dechlorination are solved, waste is turned into treasure to obtain valuable scarce resources such as potassium chloride, magnesium chloride and the like, and therefore, a method for classifying and extracting single chloride salt solution from fly ash washing mixed salt wastewater is provided.
Disclosure of Invention
The invention aims to provide a method for classifying and extracting single chloride solution from fly ash washing mixed salt wastewater, which solves the problems of poor treatment effect, high energy consumption and high cost in the prior art.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a method for extracting single chlorine salt solution from fly ash washing mixed salt wastewater in a classified manner, which comprises the following steps:
precooling original wastewater, introducing cold energy generated by separating ice crystals from subsequent crystal separation freezing and salt separation into a mixed salt wastewater pipeline system to precool the mixed salt wastewater, and well recycling residual cold of the system;
separating crystal, freezing and separating salt, and separating three different chloride salts at different eutectic point temperatures through three rounds of crystal separation freezing;
and step three, preparing salt by classification and concentration, namely preparing salt by classification and concentration of three salt ices such as potassium chloride and calcium chloride solutions obtained by crystallizing, freezing and separating salt.
Preferably, the principle of the crystallization freezing salt separation in the second step is that when the brine concentration is less than the eutectic point concentration, the brine can separate out water ice along with the decrease of the ambient temperature, so that the brine concentration is increased; when the ambient temperature is equal to or lower than the eutectic point temperature of the salt water, the salt water is frozen into salt ice, and the salt ice taking salt cells as the core and taking free water and water ice as the wrapping salt ice meets external force, the salt crystals, the salt water and the water ice are naturally separated.
Preferably, in the second step, the first three-wheel crystal separation freezing wheel performs crystal separation freezing on potassium chloride, the second wheel performs crystal separation freezing on sodium chloride, and the third wheel performs crystal separation freezing on magnesium chloride.
Preferably, the potassium chloride crystal separation freezing is carried out by taking the eutectic point temperature of potassium chloride as a reference, actually setting the temperature lower than the reference temperature by ten degrees as a temperature control value of a freezer, freezing the original wastewater, taking out the formed ice crystals at regular time by using an ice taking mechanism until no ice crystals are generated, allowing the residual mother liquor to enter two rounds of crystal separation freezing, and taking out the ice crystals after cleaning to obtain separated potassium chloride salt ice.
Preferably, the sodium chloride and the magnesium chloride respectively adopt respective eutectic point temperatures as references, the temperature setting of ten degrees below the reference temperature is actually used as a temperature control value of the refrigerator for refrigeration, and the rest steps are the same.
Preferably, the refrigerator has a function of setting multiple freezing temperatures on the refrigerator in a program-controlled manner or three groups of refrigerators are adopted for separating three chlorine salts, namely potassium chloride, sodium chloride and magnesium chloride in the washed fly ash wastewater respectively.
Preferably, after the crystallization and freezing are performed to separate the salt in the step two, the residual calcium chloride solution is concentrated by using a low-temperature technology and then dried, so that the calcium chloride salt crystal is obtained.
Preferably, when the salt is prepared by classification and concentration in the third step, the three kinds of salt ice are separated from salt cells separated out from the salt ice by using a centrifugal machine and centrifugal force, the water ice and the like can be recycled and washed with the fly ash desalination water, the salt cells are dried to form salt crystals, and the calcium chloride solution is concentrated and dried by using a low-temperature technology to obtain the calcium chloride salt crystals.
Preferably, the calcium chloride solution is concentrated, dried and crystallized by using a brine concentration device, and the centrifugal machine uses a ternary centrifugal machine to carry out ternary separation on three salt ices to obtain three single chloride salts by using centrifugal force to separate salt crystals, water ices and free water.
The invention has the following beneficial effects:
1. the invention uses freezing to replace evaporation and crystal separation to replace distillation to separate single chloride salt from mixed brine, which is a subversive innovation of the traditional method, solves the difficulty of fly ash disposal and utilization technically, reduces 30-60% of energy consumption, equipment expense, equipment maintenance and loss compared with the traditional method economically, and changes the disposal and utilization project of fly ash from the prior cost center into a profit center with return on investment and profitable operation.
2. The method separates the mixed salt solution by utilizing the eutectic temperature of different salts, thereby reducing the treatment difficulty of the residual salt solution after the washing of the fly ash.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall process of the method for classifying and extracting single chloride solution from fly ash washing mixed salt wastewater.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "middle", "outer", "inner", "lower", "around", and the like, indicate orientations or positional relationships, are used merely to facilitate the description of the present invention and to simplify the description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
The first embodiment is as follows:
referring to fig. 1, the present invention is a method for classifying and extracting a single chloride solution from fly ash washing mixed salt wastewater, which comprises the following steps:
pre-cooling original wastewater, introducing cold energy generated by separating ice crystals from subsequent crystal separation freezing separated salt into a mixed salt wastewater pipeline system to pre-cool the mixed salt wastewater, and well recycling residual cold of the system;
separating crystal, freezing and separating salt, and separating three different chloride salts at different eutectic point temperatures through three rounds of crystal separation freezing;
and step three, preparing salt by classification and concentration, namely preparing salt by classification and concentration of three salt ices such as potassium chloride and calcium chloride solutions obtained by crystallizing, freezing and separating salt.
Further, the principle of crystal freezing and salt separation in the second step is that when the concentration of the brine is less than the eutectic point concentration, the brine can be reduced along with the ambient temperature to separate out water ice, so that the concentration of the brine is increased; when the ambient temperature is equal to or lower than the eutectic point temperature of the salt water, the salt water can be frozen into salt ice, and when the salt ice taking salt cells as the core and taking free water and water ice as the wrapping salt ice meets external force, the salt crystals, the salt water and the water ice can be naturally separated.
Further, in the second step, three-wheel crystal separation freezing first wheel performs crystal separation freezing on potassium chloride, a second wheel performs crystal separation freezing on sodium chloride, and a third wheel performs crystal separation freezing on magnesium chloride.
Further, potassium chloride is subjected to crystal separation and freezing by taking the eutectic point temperature of potassium chloride as a reference, the temperature actually lower than the reference temperature by ten degrees is set as a temperature control value of the refrigerator, the original wastewater is frozen, the frozen ice crystals are taken out at regular time by an ice taking mechanism until no ice crystals are generated, the residual mother liquor can enter two rounds of crystal separation and freezing, and the ice crystals taken out after cleaning are separated potassium chloride salt ice.
Further, the sodium chloride and the magnesium chloride respectively adopt respective eutectic point temperatures as references, and the temperature setting of ten degrees below the reference temperature is actually used as the temperature control value of the refrigerator for refrigeration, and the rest steps are the same.
Furthermore, the refrigerator needs to have the function of setting multiple freezing temperatures on the refrigerator in a program-controlled manner or three groups of refrigerators are adopted for separating three chlorine salts, namely potassium chloride, sodium chloride and magnesium chloride in the washed fly ash wastewater respectively.
Further, after the salt separation by crystallization and freezing in the step two, the residual calcium chloride solution is concentrated by using a low-temperature technology and then dried, and the calcium chloride salt crystal is obtained.
Further, in the step three, when salt is prepared by classification and concentration, the three kinds of salt ice are separated from salt cells separated out from the salt ice by using a centrifugal machine and centrifugal force, the water ice and the like can be recycled and washed with fly ash desalination water, the salt cells are dried to form salt crystals, and the calcium chloride solution is concentrated and dried by using a low-temperature technology to obtain the calcium chloride salt crystals.
Furthermore, a brine concentration device is used for concentrating, drying and crystallizing the calcium chloride solution, and a ternary centrifuge is used for carrying out ternary separation on salt crystals, water ice and free water on the three kinds of salt ice by using centrifugal force to obtain three kinds of single chloride salts.
The second embodiment:
referring to fig. 1, the invention relates to a method for classifying and extracting single chloride solution from fly ash washing mixed salt wastewater, which utilizes the difference between the solidification temperature and concentration curve of various chloride solutions in mixed brine and the eutectic point of ice salt, designs a specific environment, separates the chloride solutions from the mixed brine one by one in the form of salt ice according to the sequence of the eutectic point temperature of various brine, and further implements concentration or salt crystal formation according to the requirements of subsequent treatment and utilization.
Example three:
referring to fig. 1, the present invention is a method for classifying and extracting single chloride solution from fly ash washing mixed salt wastewater, wherein the separation of single chloride from mixed salt wastewater by using freezing instead of evaporation and crystallization instead of fractionation is a subversive innovation of the traditional method, the method technically solves the difficulty of fly ash disposal and utilization, reduces the energy consumption, equipment expense, equipment maintenance and loss by 30-60% compared with the traditional method, and changes the disposal and utilization project of fly ash from the prior cost center into the profit center with return on investment and profitability.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A method for classifying and extracting single chloride solution from fly ash washing mixed salt wastewater is characterized by comprising the following steps:
precooling original wastewater, introducing cold energy generated by separating ice crystals from subsequent crystal separation freezing and salt separation into a mixed salt wastewater pipeline system to precool the mixed salt wastewater, and well recycling residual cold of the system;
separating crystal, freezing and separating salt, and separating three different chloride salts at different eutectic point temperatures through three rounds of crystal separation freezing;
and step three, preparing salt by classification and concentration, namely preparing salt by classification and concentration of three salt ices such as potassium chloride and calcium chloride solutions obtained by crystallizing, freezing and separating salt.
2. The method for classifying and extracting the single chlorine salt solution from the fly ash washing mixed salt wastewater as claimed in claim 1, wherein: the principle of crystal separation and freezing salt separation in the second step is that when the concentration of the brine is less than the concentration of the eutectic point, the brine can be reduced along with the ambient temperature to separate out water ice, so that the concentration of the brine is increased; when the ambient temperature is equal to or lower than the eutectic point temperature of the salt water, the salt water is frozen into salt ice, and the salt ice taking salt cells as the core and taking free water and water ice as the wrapping salt ice meets external force, the salt crystals, the salt water and the water ice are naturally separated.
3. The method for classifying and extracting the single chlorine salt solution from the fly ash washing mixed salt wastewater as claimed in claim 2, wherein: in the second step, the three-wheel crystal separation freezing head wheel performs crystal separation freezing on potassium chloride, the second wheel performs crystal separation freezing on sodium chloride, and the third wheel performs crystal separation freezing on magnesium chloride.
4. The method for classifying and extracting the single chlorine salt solution from the fly ash washing mixed salt wastewater as claimed in claim 3, wherein: the potassium chloride crystal separation freezing takes the eutectic point temperature of potassium chloride as a reference, actually sets the temperature lower than the reference temperature by ten degrees as the temperature control value of a freezer, freezes the original wastewater, uses an ice taking mechanism to take out the formed ice crystals at regular time until the ice crystals are not generated any more, the residual mother liquor can enter two rounds of crystal separation freezing, and the ice crystals taken out after cleaning are separated potassium chloride salt ice.
5. The method for classifying and extracting the single chlorine salt solution from the fly ash washing mixed salt wastewater as claimed in claim 3, wherein: the sodium chloride and the magnesium chloride respectively adopt respective eutectic point temperatures as references, the temperature setting which is actually ten degrees lower than the reference temperature is used as a temperature control value of the refrigerator for refrigeration, and the other steps are the same.
6. The method for classifying and extracting single chlorine salt solution from the fly ash water-washing mixed salt wastewater as claimed in claim 4 or 5, wherein: the refrigerator is required to have the function of setting a plurality of freezing temperatures on the refrigerator in a program control manner or adopt three groups of freezing boxes which are respectively used for separating three chlorine salts of potassium chloride, sodium chloride and magnesium chloride in the water washing fly ash wastewater.
7. The method for classifying and extracting the single chlorine salt solution from the fly ash washing mixed salt wastewater as claimed in claim 1, wherein: and after the crystallization and freezing separation of salt in the step two, concentrating the residual calcium chloride solution by using a low-temperature technology, and drying to obtain calcium chloride salt crystals.
8. The method for classifying and extracting the single chlorine salt solution from the fly ash washing mixed salt wastewater as claimed in claim 1, wherein: when salt is prepared by classification and concentration in the third step, the three kinds of salt ice are separated from salt cells separated out from the salt ice by a centrifugal machine and centrifugal force, the water ice and the like can be recycled and washed with fly ash desalination water, the salt cells are dried to form salt crystals, and the calcium chloride solution is concentrated and dried by using a low-temperature technology to obtain the calcium chloride salt crystals.
9. The method for classifying and extracting single chlorine salt solution from the fly ash water-washing mixed salt wastewater as claimed in claim 7 or 8, wherein: the calcium chloride solution is concentrated, dried and crystallized by using a brine concentration device, and the three-way centrifuge is used for carrying out three-way separation on salt crystals, water ice and free water by using a centrifugal force on the three kinds of salt ice to obtain three kinds of single chloride.
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Citations (9)
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| DE2204597A1 (en) * | 1972-02-01 | 1973-08-09 | Krauss Maffei Ag | PROCEDURE FOR CONTINUOUS FREEZE-CONCENTRATION OF SOLUTIONS |
| WO1996025360A1 (en) * | 1995-02-16 | 1996-08-22 | Bernard Mahue | Method for preparing a salt, particularly potassium chloride, by leaching and cooling a solution thereof |
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| US20140374361A1 (en) * | 2011-10-04 | 2014-12-25 | Technische Universiteit Delft | Treatment of aqueous solutions |
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2022
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