A resource processing system and method of waste incineration fly ash washing solution

Abstract

The present application relates to waste incineration fly ash processing technical field, especially to a kind of waste incineration fly ash water washing liquid's resource processing system and method.The technical scheme provided by the present application is by using waste incineration fly ash water washing liquid and containing glyphosate industrial waste salt and containing sodium phosphate impurity removal reagent mixture occurs precipitation, again the mixed solution is filtered, to filter out organic matter and insoluble substance in mixed solution, then the mixed solution after filtration is heated, finally using electrolytic device to the mixed solution after evaporation concentration electrolysis, to obtain chlorine, hydrogen, light brine and rich sodium lye.Therefore this based on waste incineration fly ash water washing liquid processing technology and industrial waste salt technology processing mode, not only can realize the resource utilization of waste incineration fly ash water washing liquid, but also can be absorbed industrial waste salt, realize the economic and environmental benefits of collaborative disposal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fly ash water washing liquid processing, and particularly relates to a resourceful processing system and method of waste incineration fly ash water washing liquid. BACKGROUND

[0002] A large amount of fly ash is generated in the process of incineration of waste, and is listed as hazardous waste due to containing harmful substances such as excessive heavy metals. At present, the fly ash of waste incineration is mostly disposed in a cement kiln after water washing. The fly ash water washing liquid obtained in this way is usually used for electrolysis to realize resource utilization of the fly ash water washing liquid. However, this method will generate a large amount of energy consumption in the evaporation and concentration process.

[0003] Therefore, there is an urgent need for a resourceful processing system and method of waste incineration fly ash water washing liquid to solve the technical problem. SUMMARY

[0004] The present application provides a resourceful processing system and method of waste incineration fly ash water washing liquid, which can not only effectively realize resource utilization of waste incineration fly ash water washing liquid and reduce energy consumption, but also eliminate industrial waste salt to realize economic and environmental benefits of waste system disposal.

[0005] In a first aspect, the present application provides a resourceful processing system of waste incineration fly ash water washing liquid, comprising a mixing assembly, a filtering assembly, a heating device and an electrolysis device connected in sequence. The mixing assembly is used for mixing waste incineration fly ash water washing liquid, industrial waste salt containing glyphosate and impurity removal agent containing sodium phosphate to obtain a mixed solution. The filtering assembly is used for filtering insoluble substances and organic matters in the mixed solution. The insoluble substances include solid suspensions and calcium phosphate precipitates obtained by the reaction of calcium ions in the water washing liquid and phosphate ions in the mixed solution. The heating device is used for heating the mixed solution output by the filtering assembly. The electrolysis device is used for electrolyzing the mixed solution after high-temperature heating to obtain chlorine, hydrogen, brine and sodium-rich lye.

[0006] In a second aspect, the present application provides a resourceful processing method of waste incineration fly ash water washing liquid, applied to the system described in the above embodiment, comprising:

[0007] Mixing waste incineration fly ash water washing liquid, industrial waste salt containing glyphosate and impurity removal agent containing sodium phosphate by using the mixing assembly to obtain a mixed solution;

[0008] Filtering insoluble substances and organic matters in the mixed solution by using the filtering assembly;

[0009] Heating the mixed solution output by the filtering assembly by using the heating device;

[0010] The electrolysis device is used for electrolyzing the heated mixed solution to obtain chlorine, hydrogen, light brine and sodium-rich lye.

[0011] From the above scheme, the resource processing system and method of waste incineration fly ash washing liquid provided by the application can be known, the waste incineration fly ash washing liquid is mixed with industrial waste salt containing glyphosate to obtain a mixed solution, the mixed solution is reacted with a decontamination reagent containing sodium phosphate to precipitate, the mixed solution is filtered to filter out organic matter and insoluble substances in the mixed solution, the filtered mixed solution is heated, and finally the electrolysis device is used for electrolyzing the heated mixed solution to obtain chlorine, hydrogen, light brine and sodium-rich lye. Therefore, the processing method based on the waste incineration fly ash washing liquid processing technology and the industrial waste salt technology can not only realize the resource utilization of the waste incineration fly ash washing liquid and reduce energy consumption, but also can absorb the industrial waste salt, realize the economic and environmental protection benefits of collaborative disposal. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0013] Figure 1 The system schematic diagram of the resource processing system of waste incineration fly ash washing liquid provided by the embodiment of the application.

[0014] Figure 2 For Figure 1 The method schematic diagram of the resource processing method of waste incineration fly ash washing liquid provided by the embodiment of the application.

[0015] Reference signs:

[0016] 1-mixing assembly;

[0017] 2-filtering assembly;

[0018] 3-heating device;

[0019] 4-electrolysis device. DETAILED DESCRIPTION

[0020] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0021] Referring to Figure 1 In an embodiment of the present application, a resource treatment system for waste incineration fly ash water washing solution is provided. The system comprises a mixing assembly 1, a filtering assembly 2, a heating device 3 and an electrolysis device 4 connected in sequence. The mixing assembly 1 is used to mix the waste incineration fly ash water washing solution with industrial waste salt containing glyphosate and impurity removal agent containing sodium phosphate to obtain a mixed solution. The filtering assembly 2 is used to filter insoluble substances, organic matter and calcium ions in the mixed solution. The insoluble substances include solid suspensions and calcium phosphate precipitates obtained by the reaction of calcium ions in the water washing solution and phosphate ions in the mixed solution. The heating device 3 is used to heat the mixed solution output by the filtering assembly 2. The electrolysis device 4 is used to electrolyze the heated mixed solution to obtain chlorine, hydrogen, brine and sodium-rich lye.

[0022] In the embodiment, the waste incineration fly ash water washing solution is mixed with the industrial waste salt containing glyphosate to precipitate, and then the mixed solution is filtered to remove organic matter and insoluble substances in the mixed solution. Then the filtered mixed solution is heated, and finally the electrolysis device 4 is used to electrolyze the heated mixed solution to obtain chlorine, hydrogen, brine and sodium-rich lye. Therefore, this treatment method based on the waste incineration fly ash water washing solution treatment technology and the industrial waste salt technology can not only realize the resource utilization of the waste incineration fly ash water washing solution and reduce energy consumption, but also can absorb the industrial waste salt and realize the economic and environmental benefits of collaborative disposal.

[0023] In the embodiment, the hydrogen phosphate ions in the mixed solution containing sodium phosphate in the impurity removal agent can further generate phosphate ions to react with calcium ions and generate calcium phosphate precipitates. The organic matter in the calcium phosphate solid can be removed by low-temperature pyrolysis and recycled. At the same time, the calcium ions also react with the organic matter glyphosate to generate precipitates, further removing the calcium ions and the organic matter glyphosate.

[0024] The process of glyphosate production by glycine method will produce a large amount of hazardous waste mother liquor, and the production enterprises mainly adopt two combined processes of membrane treatment / high-temperature catalytic oxidation and multi-effect evaporation / directional conversion to treat the mother liquor. However, a large amount of waste salt such as disodium hydrogen phosphate, sodium pyrophosphate and sodium chloride will be produced in the treatment process, which contains organic pollutants such as glyphosate and aminomethyl phosphonic acid. These waste salts are generally accumulated in the warehouse of the enterprise and are waiting for policy arrangement for treatment. Therefore, the inventors creatively consider mixing the waste incineration fly ash washing liquid with the industrial waste salt to achieve the purpose of waste treatment with waste.

[0025] It should be noted that the industrial waste salt containing glyphosate can be solid waste salt or liquid waste salt solution, which is not limited herein. When the industrial waste salt is a solid waste salt, the waste incineration fly ash washing liquid is used to dissolve the industrial waste salt to obtain a mixed solution. Specifically, a container for containing the waste incineration fly ash washing liquid can be placed on the ground, the waste incineration fly ash washing liquid enters from the bottom of the container and flows out from the top, and the industrial salt is added to the middle position of the upper part of the container. In this way, the waste incineration fly ash washing liquid will not damage the impurity particles during the self-flowing process, which is conducive to the sedimentation of the impurity particles.

[0026] In an embodiment of the present application, the mixing assembly 1 comprises a first mixing device (not shown in the figure) and a second mixing device (not shown in the figure) connected in sequence, the first mixing device is used to mix the waste incineration fly ash washing liquid and the industrial waste salt containing glyphosate to obtain a saturated salt solution, and the second mixing device is used to mix the saturated salt water and the impurity removal agent containing sodium phosphate to obtain a mixed solution.

[0027] In this embodiment, the amount of industrial waste salt added can be determined by the content of chloride ions in the waste incineration fly ash washing liquid (generally, the content of chloride ions in the waste incineration fly ash washing liquid is not less than 4.74 mol / L) to ensure that the concentration of chloride salt in the mixed solution reaches saturation; the amount of impurity removal agent containing sodium phosphate added can be determined by the content of calcium ions in the saturated salt solution (generally, the content of calcium ions in the saturated salt solution is not more than 5 mg / L) to ensure that the concentration of calcium ions in the mixed solution is reduced to below 5 mg / L.

[0028] In an embodiment of the present application, the filtering assembly 2 comprises a first filtering device (not shown in the figure) and a second filtering device (not shown in the figure) connected in sequence, the first filtering device is connected with the second mixing device, the first filtering device is used to filter the insoluble substances in the mixed solution, and the second filtering device is used to filter the organic matter and residual calcium ions in the mixed solution.

[0029] In this embodiment, by setting the first filtering device and the second filtering device, the insoluble substances and the organic matter and calcium ions in the mixed solution can be filtered respectively, that is, the impurities in the mixed solution can be removed.

[0030] In one embodiment of the present application, the second filtering device comprises a centrifugal pump, a first filtering membrane, a pressure reducing valve, a second filtering membrane and an ion exchange resin connected in sequence, the centrifugal pump is connected with the first filtering device, the ion exchange resin is connected with the heating device, the centrifugal pump is used to pressurize the mixed solution output by the first filtering device to a first preset pressure and deliver it to the first filtering membrane, the pressure reducing valve is used to reduce the pressure of the mixed solution output by the first filtering membrane to a second preset pressure and deliver it to the second filtering membrane, the first filtering membrane is used to filter the organic matter in the mixed solution, and the second filtering membrane and the ion exchange resin are both used to filter the calcium ions in the mixed solution.

[0031] In this embodiment, by arranging the centrifugal pump, the pressure of the mixed solution output by the first filtering device can be raised to the first preset pressure, so that the first filtering membrane is in an optimal working pressure; by arranging the first filtering membrane, the maximum operating temperature of the first filtering membrane can be adjusted to 50℃, and the maximum molecular weight is allowed to be 100, so that the first filtering membrane can effectively remove the organic matter in the mixed solution; by arranging the pressure reducing valve, the pressure of the mixed solution output by the first filtering membrane can be reduced to the second preset pressure, so that the second filtering membrane is in an optimal working pressure; by arranging the second filtering membrane, the mixed solution output by the first filtering membrane can be further removed of the organic matter; by arranging the ion exchange resin, the mixed solution after the second filtering membrane can be adsorbed, so that the content of calcium ions in the mixed solution is at a lower content, and the organic matter in the mixed solution can also be further removed.

[0032] In one embodiment of the present application, the mixing temperature of the mixed solution is 50-70℃, the temperature of the mixed solution entering the centrifugal pump is 40-50℃, the first preset pressure is 2.2-2.8MPa, the second preset pressure is 0.2-0.4MPa, the concentration of the organic matter in the mixed solution after the second filtering membrane is not more than 0.5mg / L, the concentration of the calcium ions is not more than 0.2mg / L, and the concentration of the calcium ions in the mixed solution after the ion exchange resin is not more than 0.02mg / L.

[0033] In this embodiment, the mixing temperature of the mixed solution is 50-70℃, which can ensure the dissolution effect of the waste incineration fly ash washing solution on industrial waste salt; the temperature of the mixed solution entering the centrifugal pump is 40-50℃, and the first preset pressure is 2.2-2.8MPa, which can ensure that the first filtering membrane is in an optimal working environment, so as to improve the filtering effect of the first filtering membrane.

[0034] In some embodiments, the mixing temperature of the mixed solution can be 60℃, the temperature of the mixed solution entering the centrifugal pump can be 45℃, the first preset pressure can be 2.5MPa, and the second preset pressure can be 0.3MPa.

[0035] In one embodiment of the present application, the heating device 3 heats the filtered mixed solution at a temperature of 80-90℃, so as to ensure the electrolysis efficiency.

[0036] In one embodiment of the present application, the hydrogen obtained by the electrolysis device 4 is combusted, so as to effectively utilize the heat generated by the combustion of the hydrogen, thereby realizing the recycling of the material energy.

[0037] In one embodiment of the present application, the chlorine obtained by the electrolysis device 4 is introduced into the mixing device 1, so as to remove the organic matter in the mixed solution by the hypochlorous acid generated by the chlorine and the mixed solution in the mixing device 1; and part of the sodium-rich lye obtained by the electrolysis device 4 is used to flow back into the cathode of the electrolysis device 4 after being diluted, wherein the concentration of the diluted sodium-rich lye is 29-30%.

[0038] In the present embodiment, the chlorine obtained by the electrolysis device 4 is introduced into the second mixing device, so as to further remove the organic matter in the mixed solution by the subsequent generated hypochlorous acid; and part of the diluted sodium-rich lye is used to flow back into the cathode of the electrolysis device 4, so as to further ensure the electrolysis efficiency. In addition, the remaining part of the sodium-rich lye can be used as a medicament in the deacidification treatment.

[0039] It should be noted that the mixing assembly 1, the filtering assembly 2, the heating device 3 and the electrolysis device 4 are all known to those skilled in the art, and the specific principles and structures thereof will not be described and limited herein, as long as the functions of the devices can be realized.

[0040] In addition, as shown in Figure 2 the present application also provides a method for resourceful treatment of waste incineration fly ash washing liquid, which is applied to the system mentioned in any of the above embodiments and comprises the following steps:

[0041] Step 100: mixing the waste incineration fly ash washing liquid, the industrial waste salt containing glyphosate and the impurity removal medicament containing sodium phosphate by using the mixing assembly, to obtain a mixed solution;

[0042] Step 102: filtering the insoluble substances and organic matter in the mixed solution by using the filtering assembly;

[0043] Step 104: heating the mixed solution output by the filtering assembly by using the heating device;

[0044] Step 106: electrolyzing the heated mixed solution by using the electrolysis device, to obtain chlorine, hydrogen, fresh brine and sodium-rich lye.

[0045] It can be understood that the method embodiments and the system embodiments provided by the present application are based on the same inventive concept and have the same beneficial effects, and the beneficial effects of the method embodiments will not be described herein.

[0046] It should be noted that the relative terms, such as first and second, are used herein solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0047] Finally, it should be noted that the above-described embodiments are merely possible implementations of the present application, and are not intended to limit the present application. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. A system for resource recovery of a waste incineration fly ash water wash liquor, characterized in that, The device comprises a mixing assembly, a filtering assembly, a heating device and an electrolysis device connected in sequence, the mixing assembly is used for mixing waste incineration fly ash washing solution, industrial waste salt containing glyphosate and impurity removal agent containing sodium phosphate to obtain a mixed solution, the filtering assembly is used for filtering insoluble substances and organic matters in the mixed solution, the insoluble substances include solid suspensions and calcium phosphate precipitates obtained by the reaction of calcium ions in the washing solution and phosphate ions in the mixed solution, the heating device is used for heating the mixed solution output by the filtering assembly, and the heating temperature is 80-90 DEG C, and the electrolysis device is used for electrolyzing the mixed solution after high-temperature heating to obtain chlorine, hydrogen, brine and sodium-rich lye; The mixing assembly comprises a first mixing device and a second mixing device connected in sequence, the first mixing device is used for mixing the fly ash washing solution and the industrial waste salt to obtain a saturated salt solution, and the second mixing device is used for mixing the saturated salt solution and the impurity removal agent containing sodium phosphate to obtain the mixed solution; The chlorine obtained by the electrolysis device is used for being introduced into the second mixing device, so that the hypochlorous acid generated by the chlorine and the mixed solution in the second mixing device is used for removing the organic matters in the mixed solution, and part of the sodium-rich lye obtained by the electrolysis device is used for being returned into the cathode of the electrolysis device after dilution, and the concentration of the sodium-rich lye after dilution is 29-30%; The filtering assembly comprises a first filtering device and a second filtering device connected in sequence, the first filtering device is connected with the second mixing device, the first filtering device is used for filtering the insoluble substances in the mixed solution, and the second filtering device is used for filtering the organic matters and residual calcium ions in the mixed solution; The second filtering device comprises a centrifugal pump, a first filtering membrane, a pressure reducing valve, a second filtering membrane and an ion exchange resin connected in sequence, the centrifugal pump is connected with the first filtering device, the ion exchange resin is connected with the heating device, the centrifugal pump is used for pressurizing the mixed solution output by the first filtering device to a first preset pressure and conveying the mixed solution to the first filtering membrane, the pressure reducing valve is used for reducing the pressure of the mixed solution output by the first filtering membrane to a second preset pressure and conveying the mixed solution to the second filtering membrane, the first filtering membrane is used for filtering the organic matters in the mixed solution, and the second filtering membrane and the ion exchange resin are both used for filtering the calcium ions in the mixed solution. The first preset pressure is 2.2-2.8 MPa, the second preset pressure is 0.2-0.4 MPa, the industrial waste salt containing glyphosate is obtained from a hazardous waste mother liquor generated in the process of producing glyphosate by using the glycine method, the industrial waste salt containing glyphosate further includes disodium hydrogen phosphate, sodium pyrophosphate and sodium chloride, the industrial waste salt containing glyphosate is a solid waste salt, the content of chloride ions in the waste incineration fly ash washing solution is not less than 4.74 mol / L, so as to ensure that the concentration of chloride salt in the mixed solution reaches saturation, the content of calcium ions in the saturated salt solution is not more than 5 mg / L, the concentration of organic matter in the mixed solution filtered by the second filter membrane is not more than 0.5 mg / L, and the concentration of calcium ions is not more than 0.2 mg / L.

2. The system of claim 1, wherein, The mixing temperature of the mixed solution is 50-70 DEG C, and the temperature of the mixed solution entering the centrifugal pump is 40-50 DEG C.

3. The system of claim 2, wherein, The hydrogen obtained by the electrolysis device is used for combustion, so as to transfer the heat generated by combustion to the heating device; the heating device is connected with the second mixing device, and is used for transferring the heat absorbed by the heating device to the second mixing device.

4. A method for resource recovery of a waste incineration fly ash washing solution, characterized by, The application is applied to the system as claimed in any one of claims 1-3, and comprises: The waste incineration fly ash washing solution, the industrial waste salt containing glyphosate and the impurity removal agent containing sodium phosphate are mixed by using the mixing assembly, so as to obtain a mixed solution; The insoluble substances and organic matter in the mixed solution are filtered by using the filtering assembly; The mixed solution output by the filtering assembly is heated by using the heating device; The heated mixed solution is electrolyzed by using the electrolysis device, so as to obtain chlorine, hydrogen, dilute brine and sodium-rich lye.

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