A system and method for treating a waste incineration fly ash washing solution in conjunction with industrial waste salt

Abstract

The present application relates to waste incineration fly ash treatment technical field, especially to a kind of waste incineration fly ash water washing liquid and industrial waste salt processing system and method of cooperation.It is provided that the technical scheme of the present application is by using waste incineration fly ash water washing liquid and containing inorganic phosphorus first industrial waste salt and containing glyphosate second industrial waste salt mixed 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, brine and rich sodium lye.Therefore this kind of 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, reduce impurity removal cost and energy consumption, but also can be absorbed industrial waste salt, realize the economic environmental protection benefit 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 waste incineration fly ash water washing liquid processing system and method. BACKGROUND

[0002] A large amount of fly ash is generated in the process of incinerating waste, and is listed as hazardous waste due to containing harmful substances such as excessive heavy metals. At present, the waste incineration fly ash 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 high impurity removal cost and energy consumption in the solution refining and evaporation concentration process.

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

[0004] The present application provides a waste incineration fly ash water washing liquid processing system and method, which can not only effectively realize resource utilization of waste incineration fly ash water washing liquid, 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 waste incineration fly ash water washing liquid processing system, comprising a mixing device, a filtering assembly, a heating device and an electrolysis device connected in sequence. The mixing device is used for mixing waste incineration fly ash water washing liquid, first industrial waste salt containing inorganic phosphorus and second industrial waste salt containing glyphosate to obtain a mixed solution. The filtering assembly is used for filtering insoluble substances and organic matter 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 waste incineration fly ash water washing liquid processing method applied to the system described in the above embodiment, comprising:

[0007] Mixing waste incineration fly ash water washing liquid, first industrial waste salt containing inorganic phosphorus and second industrial waste salt containing glyphosate by using the mixing device to obtain a mixed solution;

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

[0009] Heat the mixed solution output by the filter assembly by using the heating device;

[0010] Electrolyze the heated mixed solution by using the electrolysis device to obtain chlorine gas, hydrogen gas, light brine and sodium-rich lye.

[0011] As can be seen from the above scheme, the treatment system and method for waste incineration fly ash water washing liquid and industrial waste salt provided by the application, by using the waste incineration fly ash water washing liquid and mixing the first industrial waste salt containing inorganic phosphorus and the second industrial waste salt containing glyphosate to obtain a mixed solution, filtering the mixed solution to filter out organic matter and insoluble substances in the mixed solution, heating the filtered mixed solution to warm the filtered mixed solution, and electrolyzing the heated mixed solution by using the electrolysis device to obtain chlorine gas, hydrogen gas, light brine and sodium-rich lye. Therefore, the treatment method based on the waste incineration fly ash water washing liquid treatment technology and the industrial waste salt treatment technology can not only realize the resource utilization of the waste incineration fly ash water washing liquid, reduce the impurity removal cost and 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 treatment system for waste incineration fly ash water washing liquid and industrial waste salt provided by the embodiment of the application.

[0014] Figure 2 The system schematic diagram of the treatment system for waste incineration fly ash water washing liquid and industrial waste salt provided by the embodiment of the application. Figure 1 The method schematic diagram of the treatment method for waste incineration fly ash water washing liquid and industrial waste salt provided by the embodiment of the application.

[0015] Reference signs:

[0016] 1-mixing device;

[0017] 2-filter assembly;

[0018] 3-heating device;

[0019] 4-electrolysis device. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application 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 An embodiment of the present application provides a treatment system for waste incineration fly ash water washing solution and industrial waste salt, which comprises a mixing device 1, a filtering assembly 2, a heating device 3 and an electrolysis device 4 connected in sequence. The mixing device 1 is used for mixing the waste incineration fly ash water washing solution, the first industrial waste salt containing inorganic phosphorus and the second industrial waste salt containing glyphosate to obtain a mixed solution. The filtering assembly 2 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 solution and phosphate ions in the mixed solution. The heating device 3 is used for heating the mixed solution output by the filtering assembly 2. The electrolysis device 4 is used for electrolyzing 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, the first industrial waste salt containing inorganic phosphorus and the second industrial waste salt containing glyphosate are mixed to generate precipitates, the mixed solution is filtered to filter out the organic matters and insoluble substances in the mixed solution, 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, the treatment method based on the waste incineration fly ash water washing solution treatment technology and the industrial waste salt treatment technology can not only realize the resource utilization of the waste incineration fly ash water washing solution, reduce the impurity removal cost and energy consumption, but also can absorb the industrial waste salt, realize the economic and environmental protection benefits of collaborative disposal.

[0023] In the embodiment, the inorganic phosphorus can be sodium phosphate, sodium hydrogen phosphate, potassium phosphate and potassium hydrogen phosphate, and the specific composition of the inorganic phosphorus is not limited herein. The hydrogen phosphate ions in the sodium hydrogen phosphate and the potassium hydrogen phosphate in the mixed solution can further generate phosphate ions to realize the reaction with the calcium ions and generate calcium phosphate precipitates.

[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 membrane treatment / high temperature catalytic oxidation, multi-effect evaporation / directional conversion two combined processes to treat the mother liquor. However, a large amount of sodium phosphate dibasic, sodium pyrophosphate, sodium chloride and other waste salts will be produced in the treatment process, which contains glyphosate and aminomethyl phosphonic acid and other organic pollutants. These waste salts are generally accumulated in the warehouse of the enterprise waiting for policy arrangement for treatment. In the process of pharmaceutical chemical production, a large amount of inorganic waste salt water will be produced due to the use of a large amount of acid or alkaline substances, finally forming chemical waste salt. For example, phosphorus-containing pharmaceutical waste salt, sodium sulfate type pharmaceutical waste salt and the like, because they contain a large amount of inorganic salts such as sodium phosphate and organic pollutants such as dimethyl aniline, they cannot be directly landfilled, and the cost of other disposal methods is relatively high, so many enterprises are faced with the phenomenon of waste salt accumulation and cannot be consumed. Therefore, the inventors creatively consider mixing the waste water washing liquid of garbage incineration fly ash with the first industrial waste salt and the second industrial waste salt to achieve the purpose of waste treatment with waste.

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

[0026] In the present embodiment, the mixing device 1 is used to mix the fly ash water washing liquid with the first industrial waste salt and the second industrial waste salt, and a mixed solution is obtained after sufficient mixing and reaction.

[0027] In the present embodiment, the addition amount of the first industrial waste salt can be determined according to the content of calcium ions in the waste water washing liquid of garbage incineration fly ash (generally, the content of calcium ions in the waste water washing liquid of garbage incineration fly ash is not more than 5 mg / L), and the addition amount of the second industrial waste salt can be determined according to the content of chloride ions in the mixed solution (generally, the content of calcium ions in the solution is not less than 4.74 mol / L), so as to ensure that the concentration of calcium ions in the mixed solution is reduced to below 5 mg / L and the concentration of chloride salt in the mixed solution reaches saturation.

[0028] In the present embodiment, the filtering assembly 2 includes 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 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 the embodiment, by setting the first filter device and the second filter device, the insoluble substances and the organic matters in the mixed solution can be filtered respectively, that is, the impurities in the mixed solution can be removed.

[0030] In the embodiment, the second filter device comprises a centrifugal pump, a first filter membrane, a pressure reducing valve, a second filter membrane and an ion exchange resin connected in sequence, the centrifugal pump is connected with the first filter 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 filter device to a first preset pressure and conveying the mixed solution to the first filter membrane, the pressure reducing valve is used for reducing the pressure of the mixed solution output by the first filter membrane to a second preset pressure and conveying the mixed solution to the second filter membrane, the first filter membrane is used for filtering the organic matters in the mixed solution, and the second filter membrane and the ion exchange resin are both used for filtering the calcium ions in the mixed solution.

[0031] In the embodiment, by setting the centrifugal pump, the pressure of the mixed solution output by the first filter device can be increased to the first preset pressure, so that the first filter membrane is in an optimal working pressure; by setting the first filter membrane, the maximum operating temperature of the first filter membrane can be adjusted to 50℃, and the maximum molecular weight is allowed to be 100, so that the first filter membrane can effectively remove the organic matters in the mixed solution; by setting the pressure reducing valve, the pressure of the mixed solution output by the first filter membrane can be reduced to the second preset pressure, so that the second filter membrane is in an optimal working pressure; by setting the second filter membrane, the mixed solution output by the first filter membrane can be further removed of the organic matters; by setting the ion exchange resin, the mixed solution after the second filter membrane can be adsorbed, so that the content of the calcium ions in the mixed solution is at a lower content, and the organic matters in the mixed solution can 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 matters in the mixed solution after the second filter 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 the 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 and the first industrial waste salt and the second 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 filter membrane is in an optimal working environment, so as to improve the filtering effect of the first filter membrane.

[0034] In one embodiment of the present application, 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 the present embodiment, the heating device 3 heats the filtered mixed solution at a temperature of 80-90℃, so as to ensure the efficiency of electrolysis.

[0036] In the present embodiment, the heating device 3 is connected to the mixing device 1, and is used to transfer the heat absorbed by the heating device 3 to the mixing device 1.

[0037] In the present embodiment, the heat absorbed by the heating device 3 is transferred to the mixing device 1, so as to realize the recycling of energy.

[0038] In one embodiment of the present application, the hydrogen obtained by the electrolysis device 4 is used for combustion, so as to transfer the heat generated by combustion to the heating device 3.

[0039] In the present embodiment, the hydrogen obtained by the electrolysis device 4 is combusted, so as to effectively utilize the heat generated by combustion of hydrogen, thereby realizing the recycling of material energy.

[0040] In the present embodiment, the chlorine obtained by the electrolysis device 4 is used to be introduced into the mixing device 1, so as to remove the organic matter in the mixed solution by using 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 be returned to the cathode of the electrolysis device 4 after dilution, and the concentration of the diluted sodium-rich lye is 29-30%.

[0041] In the present embodiment, the chlorine obtained by the electrolysis device 4 is introduced into the mixing device 1, so as to further remove the organic matter in the mixed solution by using the subsequently generated hypochlorous acid; and part of the diluted sodium-rich lye is returned to the cathode of the electrolysis device 4, so as to further ensure the efficiency of electrolysis. In addition, the remaining part of the sodium-rich lye can be used as a medicament in the deacidification process.

[0042] It should be noted that the mixing device 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 or limited herein, as long as the functions of the devices can be realized.

[0043] In addition, as shown in Figure 2 the present application also provides a method for treating a waste incineration fly ash washing solution and industrial waste salt, which is applied to the system mentioned in any of the above embodiments, and comprises the following steps:

[0044] Step 100, mixing the waste incineration fly ash washing solution with the first industrial waste salt containing inorganic phosphorus and the second industrial waste salt containing glyphosate by using a mixing device to obtain a mixed solution;

[0045] Step 102, filtering the insoluble substances and organic matters in the mixed solution by using a filtering assembly;

[0046] Step 104, heating the mixed solution output by the filtering assembly by using a heating device to warm the mixed solution;

[0047] Step 106, electrolyzing the heated mixed solution by using an electrolysis device to obtain chlorine, hydrogen, brine and sodium-rich lye.

[0048] It can be understood that the method embodiment and the system embodiment provided by the present application are based on the same inventive concept, and both have the same beneficial effects. Therefore, the beneficial effects of the method embodiment will not be described here.

[0049] It should be noted that in the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0050] Finally, it should be noted that the above description is only the preferred embodiment of the present application, which is only used to illustrate the technical scheme of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A system for treating waste incineration fly ash washing liquid in conjunction with industrial waste salt, characterized in that, The application relates to a waste incineration fly ash water washing liquid mixing device, which comprises a mixing device, a filtering assembly, a heating device and an electrolysis device connected in sequence, wherein the mixing device is used for mixing the waste incineration fly ash water washing liquid with a first industrial waste salt containing inorganic phosphorus and a second industrial waste salt containing glyphosate to obtain a mixed solution; the filtering assembly is used for filtering insoluble substances and organic matters in the mixed solution, wherein the insoluble substances include solid suspensions and calcium phosphate precipitates generated 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, and the heating temperature is 80-90 DEG C; and the electrolysis device is used for electrolyzing the high-temperature heated mixed solution to obtain chlorine, hydrogen, brine and sodium-rich lye, wherein the chlorine obtained by the electrolysis device is used for being introduced into the mixing device to remove the organic matters in the mixed solution by using the hypochlorous acid generated by the chlorine and the mixed solution in the mixing device; 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 being diluted, and the concentration of the diluted sodium-rich lye is 29-30%. The filtering assembly comprises a first filtering device and a second filtering device connected in sequence, wherein 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, wherein 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 first industrial waste salt includes phosphorus-containing medical waste salt, sodium sulfate type medical waste salt and dimethyl aniline organic matter, the second industrial waste salt is obtained from a hazardous waste mother liquor generated in the process of producing glyphosate by using the glycine method, the second industrial waste salt further includes disodium hydrogen phosphate, sodium pyrophosphate and sodium chloride, the first industrial waste salt and the second industrial waste salt are both solid waste salts, the calcium ion content in the waste incineration fly ash water washing liquid is not more than 5 mg / L, the chlorine ion content in the mixed solution is not less than 4.74 mol / L, the organic matter concentration in the mixed solution after being filtered by the second filtering membrane is not more than 0.5 mg / L, and the calcium ion concentration 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 to transfer the heat generated by combustion to the heating device.

4. The system of claim 3, wherein, The heating device is connected with the mixing device to transfer the heat absorbed by the heating device to the mixing device.

5. A method for treating a waste incineration fly ash water wash liquor in conjunction with an industrial waste salt, characterized by, The system is applied to the system as claimed in any one of claims 1-4, comprising: The waste incineration fly ash washing solution is mixed with the first industrial waste salt containing inorganic phosphorus and the second industrial waste salt containing glyphosate by using the mixing device to obtain a mixed solution; The insoluble substances and organic matters 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 to obtain chlorine, hydrogen, brine and sodium-rich lye.

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