A vitrification treatment method for petrochemical organic hazardous waste incineration ash

Abstract

The application relates to the technical field of hazardous waste treatment, and discloses a vitrification treatment method for petrochemical organic hazardous waste incineration ash, which comprises the following steps: (1) mixing petrochemical organic hazardous waste incineration ash with alkali liquor, then performing solid-liquid separation, so that the content of chlorine elements in the obtained solid phase is not higher than 0.04 wt%, the content of fluorine elements is not higher than 0.5 wt%, and then performing drying, crushing and screening to obtain pretreated incineration ash; (2) mixing the pretreated incineration ash, silicon-containing substances and calcium-containing substances, high-temperature melting and quenching cooling of the obtained mixture to obtain a glass body. The method realizes harmless treatment of petrochemical organic hazardous waste incineration ash by performing vitrification treatment on the petrochemical organic hazardous waste incineration ash; meanwhile, the prepared glass body meets the application technical requirements of materials such as a substitute material of highway asphalt aggregate, a construction sand, a construction pebble and a substitute material of broken stone, and realizes resource utilization of the petrochemical organic hazardous waste incineration ash.

Description

Technical Field

[0001] This invention relates to the field of hazardous waste treatment technology, specifically to a vitrification treatment method for petrochemical organic hazardous waste incineration ash residue. Background Technology

[0002] The bottom ash and fly ash generated from the incineration and pyrolysis of organic hazardous waste produced in the petrochemical process are still considered hazardous waste and must be included in the management of hazardous waste.

[0003] Currently, the main method for treating hazardous waste incineration fly ash and bottom ash in my country is stabilization, solidification, and landfill disposal. This method utilizes safe landfill technology, which involves pre-treatment with cement for stabilization and solidification before final landfilling. This technology is currently the primary method for the harmless disposal of ash and slag, with low operating costs and the potential for large-scale application. However, cement solidification is often incomplete, and with time and changes in the external environment, harmful substances can easily be released again.

[0004] Therefore, there is an urgent need to provide a new method for treating petrochemical hazardous waste incineration ash residue, so as to utilize the petrochemical hazardous waste incineration ash residue as a resource and permanently fix the harmful substances in the petrochemical hazardous waste incineration ash residue. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a vitrification treatment method for petrochemical organic hazardous waste incineration ash. The vitrified body obtained by this method can permanently fix harmful substances in the incineration ash, thereby achieving the harmlessness, reduction, and resource utilization of petrochemical hazardous waste incineration ash.

[0006] To achieve the above objectives, the present invention provides a method for vitrification treatment of petrochemical organic hazardous waste incineration ash residue, the method comprising the following steps:

[0007] (1) Mix petrochemical organic hazardous waste incineration ash with alkaline solution, then separate solid and liquid, so that the chlorine content in the obtained solid phase is not higher than 0.04wt% and the fluorine content is not higher than 0.5wt%, then dry, crush and screen to obtain pretreated incineration ash;

[0008] (2) The pretreated incineration ash, silicon-containing material and calcium-containing material are mixed, and the resulting mixture is melted at high temperature and quenched and cooled to obtain a glass body;

[0009] In step (2), the weight ratio of the pretreated incineration ash, silicon-containing material and calcium-containing material is 10:(15~40):(1~10), wherein the silicon-containing material is based on the weight of SiO2 and the calcium-containing material is based on the weight of CaO.

[0010] Preferably, the preparation process of the petrochemical organic hazardous waste incineration ash residue includes: mixing petrochemical organic hazardous waste incineration fly ash and petrochemical organic hazardous waste incineration bottom ash to obtain petrochemical organic hazardous waste incineration ash residue.

[0011] The weight ratio of the fly ash from the petrochemical organic hazardous waste incineration to the bottom ash from the petrochemical organic hazardous waste incineration is 100:40~230.

[0012] Preferably, the fly ash from the petrochemical organic hazardous waste incineration contains, based on the total weight of the fly ash, 0.1-0.5% SiO2, 0.3-0.7% K2O, 50-60% Na2O, 0.1-0.4% CaO, 1-5% Fe2O3, 0.2-0.4% P2O5, and 5-10% C.

[0013] Preferably, the bottom ash from the petrochemical organic hazardous waste incineration contains, based on the total weight of the bottom ash, 1-3% SiO2, 1-2.5% K2O, 40-55% Na2O, 0.4-0.8% CaO, 5-8% Al2O3, 1-3% Fe2O3, 0.1-0.4% P2O5, and 6-8% C.

[0014] Preferably, in step (1), the hazardous characteristics of the petrochemical organic hazardous waste incineration ash residue are as follows: based on the petrochemical organic hazardous waste incineration ash residue, the content of lead is <20 mg / kg, mercury is <5 mg / kg, arsenic is <50 mg / kg, selenium is <30 mg / kg, antimony is <10 mg / kg, titanium is <1000 mg / kg, manganese is <500 mg / kg, cobalt is <50 mg / kg, barium is <1000 mg / kg, vanadium is <5000 mg / kg, copper is <100 mg / kg, zinc is <3000 mg / kg, chromium is <5000 mg / kg, nickel is <500 mg / kg, cadmium is <5 mg / kg, and cyanide is <5 mg / kg.

[0015] Preferably, the pH value of the leachate from the petrochemical organic hazardous waste incineration ash is 9-13.

[0016] Preferably, in step (1), the alkaline solution is selected from saturated sodium carbonate solution and / or saturated sodium hydroxide solution.

[0017] Preferably, the weight ratio of the petrochemical organic hazardous waste incineration ash to alkaline solution is 4~10:1.

[0018] Preferably, in step (1), the step of mixing the petrochemical organic hazardous waste incineration ash with alkaline solution is carried out at 30~60°C.

[0019] Preferably, in step (1), the drying temperature is 120~150℃ and the drying time is 2~3h.

[0020] Preferably, the particle size of the pretreated incineration ash is less than 1.5 mm.

[0021] Preferably, in step (2), the silicon-containing material is selected from one or more of SiO2, quartz sand, sandstone, quartzite, potassium feldspar, sodium feldspar, pyrophyllite and kaolin.

[0022] Preferably, in step (2), the calcium-containing substance is selected from one or more of CaO, limestone, calcite and calcium carbonate.

[0023] Preferably, in step (2), the high-temperature melting step has a melting temperature of 1050℃~1300℃ and a melting time of 30~60min.

[0024] Preferably, in step (2), the cooling rate in the quenching and cooling step is 550~750℃ / min.

[0025] The advantages and beneficial effects of this invention are:

[0026] 1. The method provided by the present invention uses petrochemical organic hazardous waste incineration ash, silicon-containing substances and calcium-containing substances as raw materials to successfully prepare a glass body, so that the radioactive elements and heavy metal elements in the petrochemical organic hazardous waste incineration ash are firmly bound in the solidified glass body, thereby realizing the harmlessness of petrochemical organic hazardous waste incineration ash.

[0027] 2. The vitreous body prepared by the method provided by the present invention, after testing, meets the application technical requirements of alternative materials for highway asphalt aggregates, construction sand, construction pebbles and crushed stone, etc., and realizes the resource utilization of petrochemical organic hazardous waste incineration ash residue.

[0028] 3. The method provided by this invention uses alkaline washing to remove corrosive elements (F and Cl) from petrochemical organic hazardous waste incineration ash, thereby avoiding corrosion of the melting equipment by corrosive elements during high-temperature melting. At the same time, the chlorine content in the resulting glass is less than 0.06 wt%, which enables it to be used in cement and concrete, thus broadening the application scenarios of the glass. Attached Figure Description

[0029] Figure 1 This is a schematic flowchart of an embodiment of the vitrification treatment method for petrochemical organic hazardous waste incineration ash provided by the present invention. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0032] This invention provides a method for vitrification treatment of petrochemical organic hazardous waste incineration ash residue. Please refer to the following: Figure 1 The method includes the following steps:

[0033] (1) Mix petrochemical organic hazardous waste incineration ash with alkaline solution, then separate solid and liquid, so that the chlorine (Cl) content in the obtained solid phase is not higher than 0.04wt% and the fluorine (F) content is not higher than 0.5wt%, then dry, crush and screen to obtain pretreated incineration ash;

[0034] (2) The pretreated incineration ash, silicon-containing material and calcium-containing material are mixed, and the resulting mixture is melted at high temperature and quenched and cooled to obtain a glass body.

[0035] In a specific embodiment, the CaO and SiO2 contents in the petrochemical organic hazardous waste incineration ash selected in this invention are both low, making it difficult to directly formulate a high-performance glass. Therefore, in this invention, the glass is prepared using petrochemical organic hazardous waste incineration ash, silicon-containing substances, and calcium-containing substances as raw materials.

[0036] Specifically, the weight ratio of the pretreated incineration ash, silicon-containing material, and calcium-containing material is 10:(15~40):(1~10), specifically, for example, it can be 10:15:1, 10:20:2, 10:25:1, 10:25:5, 10:30:7 or 10:40:10, wherein the silicon-containing material is based on the weight of SiO2, and the calcium-containing material is based on the weight of CaO.

[0037] In a specific embodiment, the preparation process of the petrochemical organic hazardous waste incineration ash includes: mixing petrochemical organic hazardous waste incineration fly ash and petrochemical organic hazardous waste incineration bottom ash to obtain petrochemical organic hazardous waste incineration ash, wherein the weight ratio of the petrochemical organic hazardous waste incineration fly ash to the petrochemical organic hazardous waste incineration bottom ash is 100:40~230, specifically, for example, it can be: 100:40, 100:42, 100:100, 100:122, 100:200 or 100:230.

[0038] This invention utilizes the existing elements in petrochemical organic hazardous waste incineration fly ash and bottom ash through co-processing. In this document, petrochemical organic hazardous waste incineration fly ash is referred to as incineration fly ash, and petrochemical organic hazardous waste incineration bottom ash is referred to as incineration bottom ash.

[0039] In this invention, the petrochemical organic hazardous waste incineration fly ash and bottom ash refer to fly ash and bottom ash produced by incineration (or pyrolysis) of at least one of the following: typical petrochemical refining hazardous waste (hydrocarbon polymers from cracked filters, waste solvent oil, coke residue from cracked heat exchangers, waste alcohols, etc.), chemical hazardous waste (organic solvents), and wastewater treatment equipment (residual activated sludge, oily sludge).

[0040] In this invention, the petrochemical organic hazardous waste incineration fly ash contains, based on the total weight of the petrochemical organic hazardous waste incineration fly ash, 0.1-0.5% SiO2, 0.3-0.7% K2O, 50-60% Na2O, 0.1-0.4% CaO, 1-5% Fe2O3, 0.2-0.4% P2O5, and 5-10% C.

[0041] In this invention, the bottom ash from the petrochemical organic hazardous waste incineration contains, based on its total weight, 1-3% SiO2, 1-2.5% K2O, 40-55% Na2O, 0.4-0.8% CaO, 5-8% Al2O3, 1-3% Fe2O3, 0.1-0.4% P2O5, and 6-8% C.

[0042] The hazardous characteristics of the petrochemical organic hazardous waste incineration ash residue are as follows: based on the petrochemical organic hazardous waste incineration ash residue, the content of lead is <20 mg / kg, mercury is <5 mg / kg, arsenic is <50 mg / kg, selenium is <30 mg / kg, antimony is <10 mg / kg, titanium is <1000 mg / kg, manganese is <500 mg / kg, cobalt is <50 mg / kg, barium is <1000 mg / kg, vanadium is <5000 mg / kg, copper is <100 mg / kg, zinc is <3000 mg / kg, chromium is <5000 mg / kg, nickel is <500 mg / kg, cadmium is <5 mg / kg, and cyanide is <5 mg / kg. Under the above conditions, the heavy metal content is low, which reduces the adverse effects of heavy metal impurities on the vitreous properties.

[0043] In a specific implementation, the leachate from the petrochemical organic hazardous waste incineration ash has a pH value of 9-13, thus providing an alkaline environment for the system without the need for additional alkaline substances.

[0044] In step (1), corrosive elements F and Cl are removed from the petrochemical organic hazardous waste incineration ash by mixing and stirring the ash with an alkaline solution (i.e., alkaline washing). To achieve better removal results, the alkaline washing is preferably performed 2 to 3 times.

[0045] In this invention, the alkaline solution is selected from saturated sodium carbonate solution and / or saturated sodium hydroxide solution.

[0046] In a preferred embodiment, in step (1), the weight ratio of the petrochemical organic hazardous waste incineration ash to the alkaline solution is 4 to 10:1, specifically, for example, 4:1, 5:1, 7:1 or 10:1.

[0047] In a preferred embodiment, the alkaline washing operation temperature in step (1) is 30~60℃.

[0048] In a preferred embodiment, in step (1), the drying temperature can be 120°C, 130°C, 135°C, or 150°C, and the drying time can be 2h, 2.2h, 2.5h, or 3h.

[0049] In a specific implementation, in step (1), pretreated incineration ash with a particle size of less than 1.5 mm is obtained by crushing and screening, preferably with a particle size of less than 1 mm.

[0050] Specifically, in step (2), the silicon-containing material is selected from one or more of SiO2, quartz sand, sandstone, quartzite, potassium feldspar, sodium feldspar, pyrophyllite and kaolin.

[0051] Specifically, in step (2), the calcium-containing substance is selected from one or more of CaO, limestone, calcite and calcium carbonate.

[0052] To achieve high-temperature melting and save costs, in step (2), the melting temperature is preferably 1050℃~1300℃, specifically, for example, 1050℃, 1100℃, 1250℃ or 1300℃, and the melting time is preferably 30~60min, specifically, for example, 30min, 40min, 50min or 60min. It is understood that when the melting temperature is 1000℃ or the melting time is 20min, the mixture cannot be completely melted, and therefore the molten product cannot be generated, let alone a glass body can be obtained.

[0053] In this invention, in step (2), the quenching cooling can be water cooling, ice cooling, air cooling, or ice-water quenching, etc. For ease of operation, water cooling or air cooling is adopted in this invention. Preferably, in the quenching cooling step, the cooling rate is 550~750℃ / min.

[0054] Testing revealed that the vitreous substance obtained by this invention meets the standards of GB 5085.3 "Identification Standard for Hazardous Waste - Leaching Toxicity Identification" and also meets the requirements for the determination of vitreous substances, environmental safety and quality requirements, and application technology requirements in "Technical Requirements for Vitrification Products of Solid Waste," making it suitable as a substitute material for building materials. Specifically, the vitreous substance meets the requirements of JTG F40 standard and can be used as a substitute material for asphalt pavement aggregate; it also meets the requirements of GB / T 14685 standard and can be used as a substitute material for pebbles and crushed stone used in construction; and it also meets the requirements of GB / T 14684 standard and can be used as a substitute material for sand used in construction.

[0055] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto. In the following embodiments 1-4, the hazardous characteristics of the petrochemical organic hazardous waste incineration ash residue are as follows: based on the petrochemical organic hazardous waste incineration ash residue, the content of lead is <20 mg / kg, mercury <5 mg / kg, arsenic <50 mg / kg, selenium <30 mg / kg, antimony <10 mg / kg, titanium <1000 mg / kg, manganese <500 mg / kg, cobalt <50 mg / kg, barium <1000 mg / kg, vanadium <5000 mg / kg, copper <100 mg / kg, zinc <3000 mg / kg, chromium <5000 mg / kg, nickel <500 mg / kg, cadmium <5 mg / kg, and cyanide <5 mg / kg.

[0056] Example 1

[0057] (1) The fly ash and bottom ash of petrochemical organic hazardous waste incineration are mixed to obtain petrochemical organic hazardous waste incineration ash residue, wherein the weight ratio of the incineration fly ash to the incineration bottom ash is 100:100. The main components of the incineration fly ash, measured by XRF and fixed carbon detection methods, are as follows by weight percentage: SiO2 0.12%, K2O 0.67%, Na2O 60%, CaO 0.12%, Fe2O3 1.2%, P2O5 0.22%, C 5.3%. The main components of the incineration bottom ash, measured by weight percentage, are as follows: SiO2 2.79%, K2O 2.44%, Na2O 54%, CaO 0.4%, Al2O3 7.5%, Fe2O3 1.1%, P2O5 0.12%, C 6.2%. The pH value of the leachate of the petrochemical organic hazardous waste incineration ash residue is 13.

[0058] (2) The petrochemical organic hazardous waste incineration ash residue (fluorine content of 1.2 wt% and chlorine content of 0.1 wt%) obtained in step (1) and alkaline solution (saturated sodium carbonate solution) are thoroughly stirred and mixed at 50°C and washed twice. Then, solid-liquid separation is performed to obtain a solid phase with chlorine content of 0.04 wt% and fluorine content of 0.5 wt%. The solid phase is then dried at 150°C for 2 hours, crushed, and screened to obtain pretreated incineration ash residue with a particle size of less than 1 mm. The weight ratio of the petrochemical organic hazardous waste incineration ash residue to the alkaline solution is 7:1.

[0059] (3) The pretreated incineration ash, quartz sand and limestone obtained in step (2) are mixed, the mixture is heated to 1100℃ and kept at that temperature for 50 min, and then cooled by water quenching (cooling rate 590℃ / min) to obtain a molten product. The weight ratio of the pretreated incineration ash, quartz sand (calculated as SiO2) and limestone (calculated as CaO) is 10:25:5.

[0060] Example 2

[0061] (1) The fly ash and bottom ash of petrochemical organic hazardous waste incineration are mixed to obtain petrochemical organic hazardous waste incineration ash residue, wherein the weight ratio of the incineration fly ash to the incineration bottom ash is 100:122. According to XRF and fixed carbon detection methods, the main components of the incineration fly ash by weight percentage include: SiO2 0.45%, K2O 0.32%, Na2O 51%, CaO 0.4%, Fe2O3 4.5%, P2O5 0.38%, C 9.6%, and the main components of the incineration bottom ash by weight percentage include: SiO2 1.2%, K2O 1.34%, Na2O 41%, CaO 0.8%, Al2O3 5.2%, Fe2O3 2.9%, P2O5 0.4%, C 7.9%. The pH value of the leachate of the petrochemical organic hazardous waste incineration ash residue is 9.

[0062] (2) The petrochemical organic hazardous waste incineration ash residue (fluorine content of 1.8 wt% and chlorine content of 0.12 wt%) obtained in step (1) and alkaline solution (saturated sodium hydroxide solution) are thoroughly stirred and mixed at 40°C and washed twice. Then, solid-liquid separation is performed to obtain a solid phase with chlorine content of 0.03 wt% and fluorine content of 0.4 wt%. The solid phase is then dried at 130°C for 2.5 h, crushed, and screened to obtain pretreated incineration ash residue with a particle size of less than 1 mm. The weight ratio of the petrochemical organic hazardous waste incineration ash residue to the alkaline solution is 6:1.

[0063] (3) The pretreated incineration ash, potassium feldspar and calcite obtained in step (2) are mixed, the mixture is heated to 1200℃ and kept at that temperature for 40 min, and then cooled by water quenching (cooling rate 670℃ / min) to obtain a molten product. The weight ratio of the pretreated incineration ash, potassium feldspar (calculated as SiO2) and calcite (calculated as CaO) is 10:30:7.

[0064] Example 3

[0065] (1) The fly ash and bottom ash of petrochemical organic hazardous waste incineration are mixed to obtain petrochemical organic hazardous waste incineration ash residue, wherein the weight ratio of the incineration fly ash to the incineration bottom ash is 100:40. The main components of the incineration fly ash, measured by XRF and fixed carbon detection methods, are as follows by weight percentage: SiO2 0.34%, K2O 0.5%, Na2O 56%, CaO 0.33%, Fe2O3 1.5%, P2O5 0.3%, C 8.5%. The main components of the incineration bottom ash, measured by weight percentage, are as follows: SiO2 1.83%, K2O 1.5%, Na2O 46%, CaO 0.6%, Al2O3 6.3%, Fe2O3 1.8%, P2O5 0.26%, C 7.3%. The pH value of the leachate of the petrochemical organic hazardous waste incineration ash residue is 12.3.

[0066] (2) The petrochemical organic hazardous waste incineration ash residue (fluorine content of 0.9 wt% and chlorine content of 0.08 wt%) obtained in step (1) and alkaline solution (saturated sodium carbonate solution) are thoroughly stirred and mixed at 30°C and washed twice. Then, solid-liquid separation is performed to obtain a solid phase with chlorine content of 0.04 wt% and fluorine content of 0.5 wt%. The solid phase is then dried at 120°C for 3 hours, crushed, and screened to obtain pretreated incineration ash residue with a particle size of less than 0.5 mm. The weight ratio of the petrochemical organic hazardous waste incineration ash residue to alkaline solution is 10:1.

[0067] (3) Mix the pretreated incineration ash, SiO2 and CaO obtained in step (2), heat the mixture to 1050℃ and keep it at that temperature for 60 min, and then cool it by water quenching (cooling rate 550℃ / min) to obtain a molten product, wherein the weight ratio of the pretreated incineration ash, SiO2 and CaO is 10:15:1.

[0068] Example 4

[0069] (1) The fly ash and bottom ash of petrochemical organic hazardous waste incineration are mixed to obtain petrochemical organic hazardous waste incineration ash residue, wherein the weight ratio of the incineration fly ash to the incineration bottom ash is 100:230, and the incineration fly ash and incineration bottom ash are the same as in Example 3; the pH value of the leachate of the petrochemical organic hazardous waste incineration ash residue is 12.8.

[0070] (2) The petrochemical organic hazardous waste incineration ash residue (fluorine content of 2.3 wt% and chlorine content of 0.15 wt%) obtained in step (1) and alkaline solution (saturated sodium hydroxide) are thoroughly stirred and mixed at 60°C and washed twice. Then, solid-liquid separation is performed to obtain a solid phase with chlorine content of 0.04 wt% and fluorine content of 0.5 wt%. The solid phase is then dried at 120°C for 3 hours, crushed, and screened to obtain pretreated incineration ash residue with a particle size of less than 0.5 mm. The weight ratio of the petrochemical organic hazardous waste incineration ash residue to alkaline solution is 4:1.

[0071] (3) Mix the pretreated incineration ash, SiO2 and CaO obtained in step (2), heat the mixture to 1300℃ and keep it at that temperature for 30 min, and then cool it by water quenching (cooling rate 750℃ / min) to obtain a molten product, wherein the weight ratio of the pretreated incineration ash, SiO2 and CaO is 10:40:10.

[0072] Comparative Example 1

[0073] The method of Example 1 was implemented, except that no silicon-containing material was added in step (3).

[0074] Comparative Example 2

[0075] The method of Example 1 is implemented, except that in step (3), the weight ratio of the pretreated incineration ash, quartz sand (calculated as SiO2) and limestone (calculated as CaO) is 5:25:5.

[0076] Comparative Example 3

[0077] The method of Example 1 was implemented, except that no calcium-containing substance was added in step (3).

[0078] Test Example 1

[0079] The molten products obtained in Examples 1-4 and Comparative Examples 1-3 were tested for glassy material content (determined by XRD according to Appendix C of GB / T18046-2017) and acid loss rate (determined according to Appendix A of GB / T 41015-2021). The average value was taken after three tests. The test results are shown in Table 1 below.

[0080] Table 1

[0081]

[0082] As can be seen from the results in Table 1, the glassy material content in the molten products obtained in Examples 1-4 is above 95%, and the acid dissolution rate is 1.5~2.3 wt%, which meets the requirements of "Technical Requirements for Vitrification Products of Solid Waste" (GB / T 41015-2021), indicating that the method provided by the present invention successfully prepared the glassy material.

[0083] The glassy substance content in the molten products obtained in Comparative Examples 1-2 was 1.1~38.9wt%, and the acid dissolution rate was 15.4~98.3%, which did not meet the requirements for the determination of glassy substances in the "Technical Requirements for Vitrification Treatment Products of Solid Waste" (GB / T 41015-2021). This indicates that adding too little or no silicon-containing substances to the incineration ash will result in the inability to form glassy substances.

[0084] The glassy substance content in the molten product obtained in Comparative Example 3 was 87.1%, and the acid dissolution rate was 3.5%. The glassy substance content met the requirements of "Technical Requirements for Vitrification Products of Solid Waste" (GB / T 41015-2021), but the acid dissolution rate did not meet the above standard requirements. Furthermore, the glassy substance content was lower than that in Examples 1-4, while the acid dissolution rate was higher than that in Examples 1-4, indicating that the performance of the glassy substance obtained without the addition of calcium-containing substances would be reduced.

[0085] Test Example 2

[0086] The contents of harmful substances in water leaching (the leachate was prepared according to HJ557 and determined according to GB / T 14848) and the contents of harmful substances in acid leaching (determined according to GB / T 30810-2014) of the molten products obtained in Examples 1-2 and Comparative Examples 1-2 were tested, and the results are shown in Table 2 below.

[0087] Table 2

[0088]

[0089] As can be seen from Table 2, the leaching rate of harmful substances in the vitreous body prepared in Examples 1-2 of the present invention is low, which meets the requirements of the standard "Technical Requirements for Vitrification Products of Solid Waste" (GB / T 41015-2021) for "Limits of content of harmful substances in water leaching and acid leaching of vitrification products". This shows that by using the method provided by the present invention, the harmless treatment of petrochemical hazardous waste incineration ash can be achieved.

[0090] Meanwhile, the heavy metal leaching amount of the molten products obtained in Comparative Examples 1-2 was generally much higher than that in the Examples, which also indicates that adding less or no silicon-containing substances to the incineration ash will result in a higher heavy metal leaching amount of the molten products.

[0091] Examples 3-4 were subjected to the same tests as Examples 1 and 2. The results showed that the vitreous bodies prepared in Examples 3-4 also met the requirements of the "Limits of Hazardous Substance Content in Water Leaching and Acid Leaching of Vitrified Products" in the standard "Technical Requirements for Vitrified Products of Solid Waste" (GB / T 41015-2021).

[0092] Test Example 3

[0093] The vitreous bodies prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to performance testing according to the method of JTG F40-2004, and the results are shown in Table 3 below.

[0094] Table 3

[0095]

[0096] As shown in Table 3, the vitrified material obtained in the embodiments of the present invention meets the requirements for fine aggregates in the "Technical Specification for Construction of Asphalt Pavement on Highways," indicating that the vitrification treatment method for petrochemical organic hazardous waste incineration ash provided by the present invention realizes the resource utilization of petrochemical organic hazardous waste incineration ash. However, Comparative Examples 1-3 do not meet the requirements for fine aggregates in the "Technical Specification for Construction of Asphalt Pavement on Highways."

[0097] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for vitrification treatment of petrochemical organic hazardous waste incineration ash, characterized in that, The method includes the following steps: (1) Mix petrochemical organic hazardous waste incineration ash with alkaline solution, then separate solid and liquid, so that the chlorine content in the obtained solid phase is not higher than 0.04wt% and the fluorine content is not higher than 0.5wt%, then dry, crush and screen to obtain pretreated incineration ash; The preparation process of the petrochemical organic hazardous waste incineration ash residue includes: mixing petrochemical organic hazardous waste incineration fly ash and petrochemical organic hazardous waste incineration bottom ash to obtain petrochemical organic hazardous waste incineration ash residue, wherein the weight ratio of the petrochemical organic hazardous waste incineration fly ash to the petrochemical organic hazardous waste incineration bottom ash is 100:40~230. The petrochemical organic hazardous waste incineration fly ash, based on the total weight of the fly ash, contains the following contents: SiO2 content of 0.1-0.5%, K2O content of 0.3-0.7%, Na2O content of 50-60%, CaO content of 0.1-0.4%, Fe2O3 content of 1-5%, P2O5 content of 0.2-0.4%, and C content of 5-10%. The bottom ash from the petrochemical organic hazardous waste incineration contains, based on the total weight of the bottom ash, 1-3% SiO2, 1-2.5% K2O, 40-55% Na2O, 0.4-0.8% CaO, 5-8% Al2O3, 1-3% Fe2O3, 0.1-0.4% P2O5, and 6-8% C. The weight ratio of the petrochemical organic hazardous waste incineration ash to the alkaline solution is 4~10:1; the step of mixing the petrochemical organic hazardous waste incineration ash with the alkaline solution is carried out at 30~60℃. (2) The pretreated incineration ash, silicon-containing material and calcium-containing material are mixed, and the resulting mixture is melted at high temperature and quenched and cooled to obtain a glass body; In step (2), the weight ratio of the pretreated incineration ash, silicon-containing material and calcium-containing material is 10:(15~40):(1~10), wherein the silicon-containing material is based on the weight of SiO2 and the calcium-containing material is based on the weight of CaO.

2. The method according to claim 1, characterized in that, In step (1), the hazardous characteristics of the petrochemical organic hazardous waste incineration ash residue are as follows: based on the petrochemical organic hazardous waste incineration ash residue, the content of lead is <20 mg / kg, mercury is <5 mg / kg, arsenic is <50 mg / kg, selenium is <30 mg / kg, antimony is <10 mg / kg, titanium is <1000 mg / kg, manganese is <500 mg / kg, cobalt is <50 mg / kg, barium is <1000 mg / kg, vanadium is <5000 mg / kg, copper is <100 mg / kg, zinc is <3000 mg / kg, chromium is <5000 mg / kg, nickel is <500 mg / kg, cadmium is <5 mg / kg, and cyanide is <5 mg / kg.

3. The method according to claim 1, characterized in that, In step (1), the alkaline solution is selected from saturated sodium carbonate solution and / or saturated sodium hydroxide solution.

4. The method according to claim 1, characterized in that, In step (1), the drying temperature is 120~150℃ and the drying time is 2~3h.

5. The method according to claim 1, characterized in that, The pretreated incineration ash has a particle size of less than 1.5 mm.

6. The method according to claim 1, characterized in that, In step (2), the silicon-containing material is selected from one or more of SiO2, quartz sand, sandstone, quartzite, potassium feldspar, sodium feldspar, pyrophyllite and kaolin.

7. The method according to claim 1, characterized in that, The calcium-containing substance is selected from one or more of CaO, limestone, calcite and calcium carbonate.

8. The method according to claim 1, characterized in that, In step (2), the high-temperature melting step has a melting temperature of 1050℃~1300℃ and a melting time of 30~60min.

9. The method according to claim 1, characterized in that, In step (2), the quenching and cooling step has a cooling rate of 550~750℃ / min.

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