A treatment method for iron-containing oily sludge and municipal solid waste incineration fly ash and the application of its product

Abstract

The present invention provides a treatment method for synergistically treating iron-containing oily sludge and waste incineration fly ash and the application of the product thereof. The above treatment method includes: mixing iron-containing oily sludge, waste incineration fly ash and water to obtain a mixed liquid; using advanced oxidation technology to oxidize the mixed liquid; sequentially filtering, drying, roasting, cooling and grinding the oxidized mixed liquid to obtain a photocatalyst, and this photocatalyst can be used for treating dye wastewater. This treatment method utilizes the "like dissolves like" principle to make the dioxins in the waste incineration fly ash "enrich" in the oil-containing components of the iron-containing oily sludge, realizing the efficient degradation of organic pollutants. At the same time, the soluble chlorides in the waste incineration fly ash are also removed, obtaining a "clean" calcium- and iron-containing mixture raw material that can be used to prepare a catalyst, and preparing a photocatalyst, thus realizing the harmless treatment and resource utilization of two types of hazardous wastes.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste treatment and recycling, and particularly relates to a treatment method for synergistically treating iron-containing oily sludge and municipal solid waste incineration fly ash and the application of its product. Background Art

[0002] Iron-containing oily sludge and municipal solid waste incineration fly ash are respectively hazardous waste containing organic pollutants generated during the steel smelting process and the municipal solid waste incineration process, and must be treated harmlessly; the iron-containing component in the iron-containing oily sludge and the calcium-containing component in the municipal solid waste incineration fly ash are substances that can be valuably utilized and are potential valuable resources. However, the oil-containing component in the iron-containing oily sludge, the dioxin and high-chlorine component in the municipal solid waste incineration fly ash respectively restrict the resource utilization of their valuable components. Therefore, it is necessary to degrade the organic pollutants and effectively remove the high-chlorine components.

[0003] Generally, the iron-containing oily sludge and the municipal solid waste incineration fly ash are treated separately: for the treatment of the iron-containing oily sludge, directly recycling the iron-containing oily sludge to the steel smelting process is a common treatment method, but it has problems such as the deterioration of product indicators caused by direct addition and the generation of toxic gas pollutants due to the oil-containing component under high-temperature action; for the treatment of the municipal solid waste incineration fly ash, the solidification-landfill method is the main method for treating the municipal solid waste incineration fly ash, but it has the disadvantages of large land occupation and the lack of "detoxification" of toxic substances (dioxin, heavy metals).

[0004] Therefore, the current problems of the iron-containing oily sludge and the municipal solid waste incineration fly ash, such as containing highly toxic organic pollutants, large production volume, and difficult harmless treatment, are a technical problem that urgently needs to be solved in the current technical field. Based on this, the present invention provides a treatment method for synergistically treating iron-containing oily sludge and municipal solid waste incineration fly ash and the application of its product, so as to treat the iron-containing oily sludge and the municipal solid waste incineration fly ash synergistically to obtain a "clean" calcium- and iron-containing mixture. Summary of the Invention

[0005] Based on the above description, the present invention provides a treatment method for synergistically treating iron-containing oily sludge and municipal solid waste incineration fly ash and the application of its product, so as to solve the technical problems of the iron-containing oily sludge and the municipal solid waste incineration fly ash containing highly toxic organic pollutants and difficult harmless treatment in the prior art.

[0006] The technical solution of the present invention for solving the above technical problems is as follows:

[0007] In a first aspect, the present invention provides a treatment method for synergistically treating iron-containing oily sludge and municipal solid waste incineration fly ash, including:

[0008] Mixing the iron-containing oily sludge, the municipal solid waste incineration fly ash and water to obtain a mixed liquid;

[0009] Performing oxidation treatment on the mixed liquid by using an advanced oxidation technology;

[0010] The oxidized mixture is successively subjected to filtration, drying, calcination, cooling, and grinding treatments to obtain a photocatalyst, which can be used for treating dye wastewater.

[0011] Based on the above technical solutions, the present invention can be further improved as follows.

[0012] Further, the iron content in the iron-containing sludge is not less than 40 wt%.

[0013] Further, the calcium content in the waste incineration fly ash is not less than 35 wt%.

[0014] Further, the mixing of the iron-containing sludge, waste incineration fly ash, and water specifically includes:

[0015] Mix the iron-containing sludge and the waste incineration fly ash to obtain a mixture;

[0016] Mix the mixture and water to obtain the mixture liquid.

[0017] Further, the molar ratio of calcium to iron in the mixture is 0.5 - 1.3, and the molar ratio of silicon oxide to aluminum oxide is not higher than 4.5.

[0018] Further, the mixture and water are mixed at a solid-liquid ratio of 1:4 - 1:6 (kg / L).

[0019] Further, the oxidation treatment of the mixture liquid using advanced oxidation technology specifically includes:

[0020] Ozone is introduced into the mixture liquid, and microwave is applied to degrade the organic phase in the iron-containing sludge and the dioxin in the waste incineration fly ash.

[0021] Further, the concentration of ozone is 200 - 700 mg / L;

[0022] The power of the microwave is 200 - 700 W.

[0023] Further, the successive filtration, drying, calcination, cooling, and grinding treatments of the oxidized mixture liquid specifically include:

[0024] The solid and liquid in the mixture liquid are effectively separated by pressure filtration to obtain a filtrate and a filter cake, where the moisture content of the filter cake is not higher than 50%;

[0025] Under the condition of a hot air temperature of 100 - 300 °C, the filter cake is dried until the moisture content is not higher than 1%;

[0026] The dried filter cake is subjected to microwave calcination at 1000 - 1300 °C for a calcination time of 20 - 60 min;

[0027] The calcined product is cooled to a temperature below 80 °C by using a cooling device;

[0028] The cooled calcined product is ground by using a nano-ceramic grinding technology to obtain the photocatalyst, and the average particle size of the photocatalyst is 100 - 200 nm, and the specific surface area is not less than 400 m 2 / kg.

[0029] In a second aspect, the present invention also provides an application of a product obtained by the treatment method of co-processing iron-containing oily sludge and municipal solid waste incineration fly ash according to any one of the first aspects, including:

[0030] The product obtained by the treatment method of co-processing iron-containing oily sludge and municipal solid waste incineration fly ash is a photocatalyst;

[0031] The photocatalyst is a calcium-iron-based photocatalyst and can be used for treating dye wastewater.

[0032] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0033] The treatment method of co-processing iron-containing oily sludge and municipal solid waste incineration fly ash provided by the present invention performs a water washing treatment on multi-source high-chlorine dust containing dioxins. First, the iron-containing oily sludge, the municipal solid waste incineration fly ash and water are mixed to obtain a mixed solution, and then the mixed solution is subjected to an advanced oxidation treatment to degrade the organic phase in the iron-containing oily sludge and the dioxins in the municipal solid waste incineration fly ash; then, the oxidized mixed solution is successively subjected to filtration, drying, calcination, cooling and grinding treatments to obtain a photocatalyst, and the photocatalyst can be used for treating dye wastewater, thereby achieving the goal of treating and resource utilization of the co-processing of iron-containing oily sludge and municipal solid waste incineration fly ash.

[0034] Compared with the prior art, the advantages of the technical solution of the present invention are as follows:

[0035] 1. The treatment method of co-processing iron-containing oily sludge and municipal solid waste incineration fly ash provided by the present invention utilizes the "like dissolves like" principle to make the dioxins in the municipal solid waste incineration fly ash "enrich" in the oil-containing components of the iron-containing oily sludge, that is, through the co-processing of the iron-containing oily sludge and the municipal solid waste incineration fly ash, the enrichment of dioxins in the municipal solid waste incineration fly ash is realized, which is easy for centralized treatment.

[0036] 2. This treatment method realizes the efficient degradation of organic pollutants (oil-containing components, dioxins) by using an advanced oxidation technology, and at the same time, the soluble chlorides in the municipal solid waste incineration fly ash are removed, and a "clean" calcium- and iron-containing mixture raw material that can be used to prepare a catalyst is obtained.

[0037] 3. Through the synergy between chemical components and the effective coupling of multiple technologies, the treatment method prepares a photocatalyst for wastewater treatment from refractory hazardous waste containing organic pollutants, achieving the harmless treatment and resource utilization of two types of hazardous waste and fulfilling the purpose of "treating waste with waste". Description of the Drawings

[0038] Figure 1 It is a flowchart of the treatment method for iron-containing oily sludge synergistically treating municipal solid waste incineration fly ash provided by an embodiment of the present invention;

[0039] Figure 2 It is a phase composition diagram of the photocatalyst prepared by the treatment method for iron-containing oily sludge synergistically treating municipal solid waste incineration fly ash provided by Embodiment 2 of the present invention;

[0040] Figure 3 It is a phase composition diagram of the photocatalyst prepared by the treatment method for iron-containing oily sludge synergistically treating municipal solid waste incineration fly ash provided by Embodiment 3 of the present invention;

[0041] Figure 4 It is a phase composition diagram of the photocatalyst prepared by the treatment method for iron-containing oily sludge synergistically treating municipal solid waste incineration fly ash provided by the comparative example of the present invention. Detailed Embodiments

[0042] To facilitate the understanding of the present application, the present application will be described more comprehensively with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0043] Unless otherwise defined, all the technical terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention.

[0044] Unless otherwise specified, various reagents and raw materials used in the present invention are products that can be purchased from the market or can be obtained by known methods.

[0045] The following further describes in detail the embodiments of the present invention with reference to the drawings and examples. The following examples are used to illustrate the present invention but cannot be used to limit the scope of the present invention.

[0046] In the first aspect, as Figure 1 shown, the preparation method of the treatment method for iron-containing oily sludge synergistically treating municipal solid waste incineration fly ash provided by an embodiment of the present invention includes:

[0047] Step S1: Mix the iron-containing oily sludge, municipal solid waste incineration fly ash, and water to obtain a mixed solution.

[0048] Among them, the iron-containing oily sludge refers to the oil-containing emulsion generated during the repair and grinding of rolling rolls in processes such as rolling steel in the iron and steel production process, and the mass content of iron is not less than 40%; the above-mentioned waste incineration fly ash refers to the dust removal ash generated by the flue gas purification system during the incineration of domestic waste in the municipal industry, and mainly the waste incineration fly ash generated by the grate furnace incineration process, and the mass content of calcium is not less than 35%.

[0049] Specifically, it includes the following steps:

[0050] Step S101: First mix the iron-containing oily sludge and the waste incineration fly ash to obtain a mixed material; the molar ratio of calcium to iron in this mixed material is 0.5 - 1.3, and the molar ratio of silicon oxide to aluminum oxide is not higher than 4.5.

[0051] Step S102: Mix the mixed material and water at a solid-liquid ratio of 1:4 - 1:6 (kg / L) to obtain a mixed liquid.

[0052] Step S2: Use advanced oxidation technology to oxidize the mixed liquid.

[0053] Specifically, using the composite advanced oxidation technology to treat the mixed liquid means using the composite advanced oxidation technology of microwave catalytic ozone oxidation to treat the mixed liquid, with a microwave power of 200 - 700 W and an ozone concentration of 200 - 700 mg / L, so as to achieve the degradation of the organic phase in the iron-containing oily sludge and the degradation of dioxins in the waste incineration fly ash.

[0054] Step S3: Filter, dry, roast, cool and grind the oxidized mixed liquid in sequence to obtain a photocatalyst, and the photocatalyst can be used for the treatment of dye wastewater.

[0055] Specifically, it includes the following steps:

[0056] Step S301: Filter, and use the pressure filtration method to effectively separate the solid and liquid in the mixed liquid to obtain a filtrate and a filter cake, where the moisture content of the filter cake is not higher than 50%.

[0057] Step S302: Dry, and under the condition of a hot air temperature of 100 - 300 °C, dry the filter cake until the moisture content is not higher than 1%.

[0058] Step S303: Roast, and under the condition of 1000 - 1300 °C, perform microwave roasting on the dried filter cake, and the roasting time is 20 - 60 min.

[0059] Step S304: Cool, and use a cooling device to cool the roasted product to a temperature lower than 80 °C.

[0060] Step S305: Grinding. The cooled calcined product is ground using a nanoceramic grinding technique to obtain a photocatalyst. The average particle size of the photocatalyst is 100 - 200 nm, and the specific surface area is not less than 400 m 2 / kg.

[0061] For a better understanding of the above treatment method, the following specific examples are provided for further introduction:

[0062] Example 1

[0063] Step 1: Mix iron-containing oily sludge and fly ash from waste incineration in a certain mass ratio so that n(Ca):n(Fe) is 0.5. Mix them evenly using a high-strength mixer and mix with ultrapure water at a solid-liquid ratio of 1:4 kg / L to obtain a mixed solution.

[0064] Step 2: Place the mixed solution in an advanced oxidation device, start the reactor, set the microwave power to 200 W, introduce ozone with a concentration of 200 mg / L, and treat for 30 min to oxidize the mixed solution.

[0065] Step 3: Perform the following operations on the oxidized mixed solution in sequence:

[0066] First, filter it - dry for 20 min at a hot air temperature of 300 °C; then calcine at 1000 °C for 60 min, cool to below 80 °C, and finally grind to an average particle size of 100 nm to obtain a product - a photocatalyst.

[0067] The phase composition of the obtained photocatalyst is as Figure 2 shown. The synthesized calcium-iron-based photocatalyst is mainly CaFe2O4; when used to treat wastewater with a methylene blue concentration of 20 mg / L, the degradation rate of methylene blue reaches 94.26%.

[0068] Example 2

[0069] Step 1: Mix iron-containing oily sludge and fly ash from waste incineration in a certain mass ratio so that n(Ca):n(Fe) is 0.5. Mix them evenly using a high-strength mixer and mix with ultrapure water at a solid-liquid ratio of 1:4 kg / L to obtain a mixed solution.

[0070] Step 2: Place the mixed solution in an advanced oxidation device, start the reactor, set the microwave power to 200 W, introduce ozone with a concentration of 700 mg / L, and treat for 15 min to oxidize the mixed solution.

[0071] Step 3: Perform the following operations on the oxidized mixed solution in sequence:

[0072] First, perform filtration - dry for 20 min under the condition of a hot air temperature of 300 °C; then calcine for 60 min at 1000 °C, cool to below 80 °C, and finally grind to an average particle size of 100 nm to obtain the product - a photocatalyst.

[0073] The phase composition of the obtained photocatalyst is as Figure 3 shown. The synthesized calcium-iron-based photocatalyst is mainly Ca2Fe2O5; when it is used to treat wastewater with a methylene blue concentration of 20 mg / L, the degradation rate of methylene blue reaches 96.81%.

[0074] Comparative example

[0075] Step 1: Compatibility of iron-containing oil sludge and municipal solid waste incineration fly ash in a certain mass ratio, with n(Ca):n(Fe) being 0.3. Mix them evenly using a high-strength mixer, and mix with ultrapure water at a solid-liquid ratio of 1:4 kg / L to obtain a mixed solution.

[0076] Step 2: Place the mixed solution in an advanced oxidation device, start the reactor, set the microwave power to 200 W, introduce ozone with a concentration of 700 mg / L, and treat for 15 min to perform oxidation treatment on the mixed solution.

[0077] Step 3: Perform the following operations on the mixed solution after oxidation treatment in sequence:

[0078] First, perform filtration - dry for 20 min under the condition of a hot air temperature of 300 °C; then calcine for 60 min at 1000 °C, cool to below 80 °C, and finally grind to an average particle size of 300 nm to obtain the product - a photocatalyst.

[0079] The phase composition of the obtained photocatalyst is as Figure 4 shown. It can be seen that the iron oxide content in the photocatalyst prepared in this comparative example is relatively high, while the content of calcium-iron-based photocatalyst is less than that in Example 1 and Example 2, indicating that the lack of suitable synthesis conditions is not conducive to the synthesis of photocatalysts.

[0080] Through the analysis of the above examples and comparative examples, it can be seen that the treatment method of iron-containing oil sludge synergistically treating municipal solid waste incineration fly ash provided by the present invention degrades the oil-containing components in the iron-containing oil sludge and the dioxins in the municipal solid waste incineration fly ash, removes the soluble chlorides in the municipal solid waste incineration fly ash through the effective synergy between the chemical compositions of the iron-containing oil sludge and the municipal solid waste incineration fly ash and the effective coupling of microwave and advanced oxidation technologies, obtains a "clean" calcium- and iron-containing mixture, and realizes the harmless treatment of hazardous waste containing organic pollutants.

[0081] In the second aspect, the embodiments of the present invention further provide an application of the product obtained by the treatment method of iron-containing oil sludge synergistically treating municipal solid waste incineration fly ash according to any one of the embodiments in the first aspect, including:

[0082] The treatment method of iron-containing oily sludge synergistically treating municipal solid waste incineration fly ash yields a photocatalyst;

[0083] The photocatalyst is a calcium-iron-based photocatalyst and can be used for treating dye wastewater.

[0084] Specifically, the product obtained based on the above method is a calcium-iron-based photocatalyst. From Examples 1 and 2 in the first aspect, it can be seen that the obtained photocatalyst can be used for treating dye wastewater, thereby achieving the goal of the synergistic resource utilization of iron-containing oily sludge and municipal solid waste incineration fly ash.

[0085] In summary, compared with the prior art, the treatment method of iron-containing oily sludge synergistically treating municipal solid waste incineration fly ash and the application of its product provided by the present invention have the following advantages:

[0086] 1. The treatment method of iron-containing oily sludge synergistically treating municipal solid waste incineration fly ash provided by the present invention utilizes the principle of "like dissolves like" to make dioxins in the municipal solid waste incineration fly ash "accumulate" in the oil-containing components of the iron-containing oily sludge. That is, through the synergistic treatment of iron-containing oily sludge and municipal solid waste incineration fly ash, the enrichment of dioxins in the municipal solid waste incineration fly ash is realized, which is easy to be centrally treated.

[0087] 2. This treatment method realizes the efficient degradation of organic pollutants (oil-containing components, dioxins) by adopting advanced oxidation technology. At the same time, soluble chlorides in the municipal solid waste incineration fly ash are also removed, and a "clean" calcium- and iron-containing mixture raw material that can be used to prepare a catalyst is obtained.

[0088] 3. Through the synergy between chemical components and the effective coupling of multiple technologies, this treatment method prepares a photocatalyst that can be used for wastewater treatment from difficult-to-treat hazardous wastes containing organic pollutants, realizing the harmless treatment and resource utilization of two types of hazardous wastes, and achieving the purpose of "treating waste with waste".

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A treatment method for iron-containing oily sludge and municipal solid waste incineration fly ash, characterized in that Comprising: Mixing iron-containing oily sludge, waste incineration fly ash and water to obtain a mixed liquid; Performing oxidation treatment on the mixed liquid by using an oxidation technique; Successively filtering, drying, roasting, cooling and grinding the oxidized mixed liquid to obtain a photocatalyst, and the photocatalyst can be used for treating dye wastewater Wherein, the mixing of the iron-containing oily sludge, waste incineration fly ash and water specifically comprises: mixing the iron-containing oily sludge and the waste incineration fly ash to obtain a mixture; the molar ratio of calcium to iron in the mixture is 0.5-1.3, and the molar ratio of silicon oxide to aluminum oxide is not higher than 4.5; Mixing the mixture and water at a solid-liquid ratio of 1:4-1:6 (kg / L) to obtain the mixed liquid; The oxidation treatment of the mixed liquid by using the oxidation technique specifically comprises: introducing ozone into the mixed liquid and applying microwave to degrade the organic phase in the iron-containing oily sludge and the dioxin in the waste incineration fly ash; wherein, the concentration of the ozone is 200-700 mg / L; the power of the microwave is 200-700 W; The successive filtering, drying, roasting, cooling and grinding treatment of the oxidized mixed liquid specifically comprises: Effectively separating the solid and liquid in the mixed liquid by using a pressure filtration method to obtain a filtrate and a filter cake, wherein the moisture content of the filter cake is not higher than 50%; Under the condition that the hot air temperature is 100-300 °C, drying the filter cake until the moisture content is not higher than 1%; Performing microwave roasting on the dried filter cake at 1000-1300 °C for 20-60 min; Using a cooling device to cool the roasted product to a temperature lower than 80 °C; The cooled calcined product is ground by using a nano-ceramic grinding technology to obtain the photocatalyst. The average particle size of the photocatalyst is 100-200 nm, and the specific surface area is not less than 400 m 2 / kg.

2. The treatment method of synergistically treating iron-containing oily sludge and waste incineration fly ash according to claim 1, characterized in that, The iron content in the iron-containing oily sludge is not less than 40 wt%.

3. The treatment method of iron-containing oily sludge synergistically treating waste incineration fly ash according to claim 1 is characterized in that, The calcium content in the waste incineration fly ash is not less than 35 wt%.

4. Use of the product obtained by the treatment method of the iron-containing oil sludge synergistically treating waste incineration fly ash according to any one of claims 1 to 3, characterized in that, Comprising: The product obtained by the treatment method of iron-containing oily sludge synergistically treating waste incineration fly ash is a photocatalyst; The photocatalyst is a calcium-iron-based photocatalyst and can be used for treating dye wastewater.

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