Method for recycling dezincification rotary kiln and benzopyrene sludge

Abstract

The invention belongs to the technical field of harmless treatment of benzopyrene hazardous waste sludge, and particularly relates to a dezincification rotary kiln and benzopyrene sludge resource utilization method. The method comprises the steps that benzopyrene-containing sludge and dezincification production ingredients are mixed to obtain a mixture, the total mass of the mixture is 100%, the mass of the benzopyrene-containing sludge is smaller than or equal to 40%, the mixture is conveyed to a rotary kiln at the temperature of 600-1300 DEG C to be treated, the total staying time of the mixture in the rotary kiln is larger than or equal to 60 min, and the total staying time of the mixture in the rotary kiln is larger than or equal to 60 min; the dezincification production ingredients contain zinc-containing dust mud. When the method is used for treating the benzopyrene-containing sludge, the removal rate of benzopyrene can reach 95% or above, no secondary pollutant is generated, the discharged flue gas does not contain benzopyrene, the contents of SO2, NOx, dioxin and the like in the discharged flue gas are all in a standard range, and the method is high in operability and can realize industrial treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of harmless disposal of benzopyrene hazardous waste sludge, and specifically relates to a method for resource utilization of benzopyrene sludge in coordination with a dezincification rotary kiln. Background Art

[0002] With the vigorous promotion of ecological civilization construction in my country, river water management has become a hot topic in recent years. The difficulty of river water management lies in the fact that a large amount of sludge containing organic pollution or aromatic hydrocarbon pollution generated by dredging projects needs to be disposed of harmlessly. The prior art "A method for remediating organic polluted soil" discloses that the method uses a rotary kiln to separate organic matter in the soil, thereby repairing the soil contaminated by organic matter. The specific method is: using a rotary kiln for indirect heating and desorption, the hot air and the soil are not in direct contact, the heating temperature exceeds 550°C, and the organic pollutants in the contaminated soil are completely separated to achieve the purpose of soil remediation. However, the composition of organic pollutants is relatively complex, and the removal efficiency of organic pollutants in the soil by a single high-temperature heating treatment remains to be studied.

[0003] Benzopyrene is a substance identified as a Class I carcinogen by the World Health Organization's International Agency for Research on Cancer (IARC). If hazardous waste sludge containing benzopyrene is discharged or piled up without proper treatment, it will pollute the soil, water and air, and eventually enter the human body through circulation, posing a major threat to human health. Therefore, how to harmlessly dispose of hazardous waste sludge containing benzopyrene is a more important issue. The prior art "a treatment agent for benzopyrene-contaminated sludge and its preparation method" discloses a treatment agent for benzopyrene-contaminated sludge. The preparation method of the treatment agent comprises: (1) mixing flue ash, moss dry powder, moringa leaf dry powder, potassium nitrate, snakeberry leaf dry powder, traditional Chinese medicine residue and monosodium fumarate, stirring with a ball mill for 15-30 minutes, calcining at 180-200°C for 1-2 hours, taking out and cooling in an environment below -5 degrees Celsius, and grinding into powder; (2) mixing the product obtained in the previous step with earthworm powder, silkworm pupa powder, mangosteen peel powder, lithium feldspar, soda ash and L-carnitine, stirring by ball milling for 25-40 minutes, calcining at 100-120°C for 20-50 minutes, taking out and cooling in an environment below 0 degrees Celsius, and grinding into powder; (3) mixing the product obtained in the previous step with calcium hydrogen phosphate, avermectin, hexamethyldisilazane, rutin and water, stirring by ball milling at 10-20°C for 1-1.5 hours; (4) standing the product obtained in the previous step for 10-24 hours, then stirring and mixing evenly, spray drying at 2-5°C to obtain a finished product. The sludge treating agent has a significant treatment effect on benzopyrene-contaminated sludge, and the benzopyrene fixation rate exceeds 93%. However, the sludge treating agent has more components and a complicated preparation process, which has certain limitations on the industrial treatment of benzopyrene-contaminated sludge. Summary of the invention

[0004] The purpose of the present invention is to address the shortcomings of the prior art in that the treatment effect of sludge contaminated by organic pollution or aromatic hydrocarbons is unclear and the industrial treatment is limited, and thus a method for the resource utilization of benzopyrene sludge in a dezincification rotary kiln is proposed. The method of the present invention treats a certain proportion of benzopyrene-containing sludge together with dezincification production ingredients containing zinc dust sludge in a rotary kiln for coordinated harmless treatment. During the treatment process, the temperature in the rotary kiln and the residence time of all materials in the rotary kiln are simultaneously controlled. By using the method of the present invention to treat benzopyrene-containing sludge, the removal rate of benzopyrene can reach more than 95%. At the same time, during the treatment process, benzopyrene is completely decomposed into carbon dioxide and water, and no secondary pollutants are generated. It has the advantages of being green and environmentally friendly. The emitted flue gas does not contain benzopyrene, and the emitted flue gas contains SO2 and NO. x The contents of chlorinated hydrocarbons, dioxins, etc. are all within the standard range. At the same time, the method of the invention has strong operability and can be used for industrial processing.

[0005] The present invention proposes a method for resource utilization of benzopyrene sludge in cooperation with a dezincification rotary kiln. The method comprises: mixing benzopyrene-containing sludge with dezincification production ingredients to obtain a mixture, wherein the mass of the benzopyrene-containing sludge is ≤40% based on the total mass of the mixture being 100%, conveying the mixture to a rotary kiln at 600-1300° C. for treatment, wherein the total residence time of the mixture in the rotary kiln is ≥60 minutes, and the dezincification production ingredients contain zinc-containing dust sludge.

[0006] Preferably, based on the total mass of the mixture being 100%, the mass of the benzopyrene-containing sludge is 5-10%.

[0007] Preferably, the content of benzopyrene in the benzopyrene-containing sludge is 5-10 mg / kg.

[0008] Preferably, the dezincification production batch contains 70-85% by mass of zinc-containing dust and mud.

[0009] Preferably, the temperature at the kiln tail of the rotary kiln is 600-1000°C, the temperature in the kiln is 1000-1300°C, the temperature at the kiln head is 650-1000°C, and the temperature of the rotary kiln is maintained at 1000-1300°C for ≥10 min.

[0010] Preferably, the total residence time of the mixed material in the rotary kiln is 70-90 min.

[0011] Preferably, the temperature of the rotary kiln is maintained at 1000-1300° C. for 20-30 minutes.

[0012] Preferably, the dezincification production batch contains 80% by mass of zinc-containing dust and 20% by mass of coke oven dust.

[0013] Preferably, the dezincification production batch contains 80% by mass zinc-containing dust and 20% by mass coal powder.

[0014] Preferably, the kiln slag obtained by rotary kiln treatment is used as cement clinker for making cement.

[0015] The method for resource utilization of benzopyrene sludge in a dezincification rotary kiln according to the present invention has the following beneficial effects:

[0016] In the present invention, benzopyrene-containing sludge and zinc-containing dust sludge containing a certain mass ratio are treated together in a rotary kiln for synergistic harmless treatment. The dezincification rotary kiln is a high-zinc and high-iron combustion environment. The combustion flue gas contains a large amount of fine particles of zinc oxide, and zinc oxide is a photocatalyst that can accelerate the oxidative thermal decomposition of organic pollutants such as benzopyrene and promote the synergistic effect of benzopyrene-containing dredging sludge and zinc-containing dust sludge. At the same time, the temperature in the rotary kiln and the temperature of all materials in the rotary kiln are controlled during the treatment process. The residence time can effectively degrade the content of benzopyrene in the benzopyrene-containing sludge. The method of the present invention can be used to treat the benzopyrene-containing sludge, and the removal rate of benzopyrene can reach more than 95%. At the same time, during the treatment process, benzopyrene is completely decomposed into carbon dioxide and water, and no secondary pollutants are generated. It has the advantages of being green and environmentally friendly. The treated kiln slag can be used as clinker for making cement, and the quality of the secondary zinc oxide product recovered by the rotary kiln remains unchanged. At the same time, the flue gas discharged does not contain benzopyrene, and SO2 and NO in the flue gas are reduced. x The contents of benzopyrene and dioxins are all within the standard range. At the same time, the method of the invention is highly operational and can realize low-cost, large-scale harmless industrial treatment and full resource utilization of hazardous waste sludge containing benzopyrene. DETAILED DESCRIPTION

[0017] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] Benzopyrene is a hydrocarbon-containing organic compound. When the temperature is above 1000°C, it decomposes into carbon dioxide and water vapor. The chemical formula of the decomposition reaction of benzopyrene in a rotary kiln is: 20 H 12 +23O2=20CO2+6H2O.

[0019] The present invention proposes a method for resource utilization of benzopyrene sludge in cooperation with a dezincification rotary kiln. The method comprises: mixing benzopyrene-containing sludge with dezincification production ingredients to obtain a mixture, wherein the mass of the benzopyrene-containing sludge is ≤40% based on the total mass of the mixture being 100%, conveying the mixture to a rotary kiln at 600-1300° C. for treatment, wherein the total residence time of the mixture in the rotary kiln is ≥60 minutes, and the dezincification production ingredients contain zinc-containing dust sludge.

[0020] In a specific embodiment of the method of the present invention, the mass of the benzopyrene-containing sludge can be 5%, 10%, 20%, 30% or 40% based on the total mass of the mixture as 100%; when the mass of the benzopyrene-containing sludge is >40% based on the total mass of the mixture as 100%, there is a risk of excessive residual benzopyrene content in the slag (GB 36600-2018 requires soil benzopyrene ≤1.5mg / kg). In this article, the benzopyrene-containing sludge and the dezincification production ingredients are both dry basis weight. In a preferred embodiment of the method of the present invention, the mass of the benzopyrene-containing sludge is 5-10% based on the total mass of the mixture as 100%.

[0021] In a specific embodiment of the method of the present invention, the rotary kiln can be divided into the kiln tail, the kiln middle and the kiln head. The highest temperature in the rotary kiln is in the kiln middle. Specifically, the temperature at the kiln tail is 600-1000°C, the temperature in the kiln is 1000-1300°C, and the temperature at the kiln head is 650-1000°C. In a preferred embodiment of the method of the present invention, the temperature of the rotary kiln is maintained at 1000-1300°C for ≥10 minutes. In a more preferred case, the temperature of the rotary kiln is maintained at 1000-1300°C for 20-30 minutes, for example, 20 minutes, 25 minutes or 30 minutes.

[0022] In a specific embodiment of the method of the present invention, the total time that the mixture stays in the rotary kiln is ≥60 minutes. When the total time that the mixture stays in the rotary kiln is <60 minutes, after the hazardous waste sludge containing benzopyrene in a certain proportion to the dezincification production ingredients is added to the rotary kiln, there is a risk of a high residual benzopyrene content in the kiln slag; specifically, the total time that the mixture stays in the rotary kiln can be 60 minutes, 70 minutes, 80 minutes, 90 minutes, 120 minutes, 180 minutes, 240 minutes, 300 minutes or 360 minutes. In a preferred case, the total time that the mixture stays in the rotary kiln is 70-90 minutes.

[0023] In a specific embodiment of the method of the present invention, the content of benzopyrene in the benzopyrene-containing sludge is >1.5 mg / kg, specifically, for example, it can be 2 mg / kg, 3 mg / kg, 4 mg / kg, 5.60 mg / kg, 7.99 mg / kg, 8.42 mg / kg, 10 mg / kg, 20 mg / kg, 30 mg / kg, 50 mg / kg or 100 mg / kg. In a preferred embodiment of the method of the present invention, the content of benzopyrene in the benzopyrene-containing sludge is 5-10 mg / kg. When the benzopyrene content is 5-10 mg / kg, the removal rate of benzopyrene can reach more than 99% after being treated in a rotary kiln, and the content of benzopyrene in the treated kiln slag is <0.1 mg / kg. The kiln slag can be used as clinker for making cement, and the flue gas discharged does not contain benzopyrene.

[0024] In a specific embodiment of the method of the present invention, the dezincification production batch contains 70-85% by mass of zinc-containing dust and mud, specifically, for example, 70%, 75%, 80% or 85%.

[0025] In a preferred embodiment of the method of the present invention, the dezincification production batch contains 80% by weight of zinc-containing dust and 20% by weight of coke oven dust.

[0026] In a preferred embodiment of the method of the present invention, the dezincification production batch contains 80% by mass zinc-containing dust and 20% by mass coal powder.

[0027] In a specific embodiment of the method of the present invention, the kiln slag obtained by the rotary kiln treatment is used as cement clinker for making cement.

[0028] The experimental methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials are obtained from conventional commercial channels or prepared by conventional methods unless otherwise specified.

[0029] The main chemical components of zinc-containing dust sludge are: 26.85% by mass of TFe, 6.49% by mass of Zn element, and the rest are impurities; the main chemical components of coke oven dust ash are: 86.93% by mass of C element, and the rest are impurities.

[0030] Example 1

[0031] The present embodiment provides a method for resource utilization of benzopyrene sludge in a dezincification rotary kiln, the method comprising: mixing a river dredging sludge with a benzopyrene content of 8.42 mg / kg with a dezincification production batching material at a dry basis mass ratio of 0.3:1, conveying the obtained mixture to a rotary kiln with a processing capacity of 800 tons / day for processing, the kiln tail temperature of the rotary kiln is 850°C, the kiln temperature is 1220°C, the kiln head temperature is 800°C, the time for each part of the rotary kiln to maintain above 1000°C is 25 minutes, the total time for the mixture to stay in the rotary kiln is 75 minutes, and the dezincification production batching material contains 80% zinc-containing dust sludge and 20% coke oven dust;

[0032] The benzopyrene content in the slag obtained from the rotary kiln was 0.01 mg / kg, and the removal rate of benzopyrene was 99%. The slag was used as a cement raw material. The benzopyrene content in the exhaust gas of the rotary kiln was 0, and the dioxin content in the exhaust gas was 0.018 ngTEQ / Nm 3 (GB18484-2020 emission standard requires less than 0.5ngTEQ / Nm 3 ), SO2 content is 12mg / Nm 3 (The emission standard is less than 35mg / Nm 3 ), NO x Content is 21mg / Nm 3 (The emission standard is less than 50mg / Nm 3 ).

[0033] Example 2

[0034] The present embodiment provides a method for resource utilization of benzopyrene sludge in a dezincification rotary kiln, the method comprising: mixing a river dredging sludge having a benzopyrene content of 7.99 mg / kg with a dezincification production batching material at a dry basis mass ratio of 0.3:1, conveying the obtained mixture to a rotary kiln with a processing capacity of 800 tons / day for processing, wherein the temperature at the kiln tail of the rotary kiln is 600°C, the temperature in the kiln is 1150°C, and the temperature at the kiln head is 650°C, the time for each part of the rotary kiln to maintain above 1000°C is 30 minutes, the total time for the mixture to stay in the rotary kiln is 80 minutes, and the dezincification production batching material contains 80% zinc-containing dust sludge and 20% coke oven dust;

[0035] The benzopyrene content in the slag obtained from the rotary kiln was 0.012 mg / kg, and the removal rate of benzopyrene was 99%. The slag was used as a cement raw material. The benzopyrene content in the exhaust gas of the rotary kiln was 0, and the dioxin content in the exhaust gas was 0.017 ngTEQ / Nm 3 (The emission standard is less than 0.5ngTEQ / Nm 3), SO2 content is 12.5mg / Nm 3 (The emission standard is less than 35mg / Nm 3 ), NO x Content is 19.8mg / Nm 3 (The emission standard is less than 50mg / Nm 3 ).

[0036] Example 3

[0037] The present embodiment provides a method for resource utilization of benzopyrene sludge in a dezincification rotary kiln, the method comprising: mixing a river dredging sludge having a benzopyrene content of 5.60 mg / kg with a dezincification production batching material at a dry basis mass ratio of 0.4:1, conveying the obtained mixture to a rotary kiln with a processing capacity of 800 tons / day for processing, the kiln tail temperature of the rotary kiln is 700°C, the kiln temperature is 1200°C, and the kiln head temperature is 650°C, the time for each part of the rotary kiln to maintain above 1000°C is 30 minutes, the total time for the mixture to stay in the rotary kiln is 85 minutes, and the dezincification production batching material contains 80% zinc-containing dust sludge and 20% coke oven dust;

[0038] The benzopyrene content in the slag obtained from the rotary kiln was 0.007 mg / kg, and the removal rate of benzopyrene was 99%. The slag was used as a cement raw material. The benzopyrene content in the exhaust gas of the rotary kiln was 0, and the dioxin content in the exhaust gas was 0.016 ngTEQ / Nm 3 (The emission standard is less than 0.5ngTEQ / Nm 3 ), SO2 content is 13mg / Nm 3 (The emission standard is less than 35mg / Nm 3 ), NO x Content is 20.6mg / Nm 3 (The emission standard is less than 50mg / Nm 3 ).

[0039] Example 4

[0040] The present embodiment provides a method for resource utilization of benzopyrene sludge in a dezincification rotary kiln, the method comprising: mixing a river dredging sludge with a benzopyrene content of 20 mg / kg with a dezincification production batching material at a dry basis mass ratio of 0.3:1, conveying the obtained mixture to a rotary kiln with a processing capacity of 800 tons / day for processing, the kiln tail temperature of the rotary kiln is 850°C, the kiln temperature is 1220°C, the kiln head temperature is 800°C, the time for each part of the rotary kiln to maintain above 1000°C is 25 minutes, the total time for the mixture to stay in the rotary kiln is 75 minutes, and the dezincification production batching material contains 80% zinc-containing dust sludge and 20% coke oven dust;

[0041] The benzopyrene content detected in the slag obtained from the rotary kiln treatment is 1mg / kg, and the removal rate of benzopyrene is 95%. The slag is used as a cement raw material. The benzopyrene content in the exhaust gas of the rotary kiln is 0, and the dioxin content in the exhaust gas is 0.018ngTEQ / Nm 3 (The emission standard is less than 0.5ngTEQ / Nm 3 ), SO2 content is 12mg / Nm 3 (The emission standard is less than 35mg / Nm 3 ), NO x Content is 21mg / Nm 3 (The emission standard is less than 50mg / Nm 3 ).

[0042] Example 5

[0043] The present embodiment provides a method for resource utilization of benzopyrene sludge in a dezincification rotary kiln, the method comprising: mixing a river dredging sludge having a benzopyrene content of 7.99 mg / kg with a dezincification production batching material at a dry basis mass ratio of 0.05:1, conveying the obtained mixture to a rotary kiln with a processing capacity of 800 tons / day for processing, wherein the temperature at the kiln tail of the rotary kiln is 600°C, the temperature in the kiln is 1150°C, and the temperature at the kiln head is 650°C, the time for each part of the rotary kiln to maintain above 1000°C is 30 minutes, the total time for the mixture to stay in the rotary kiln is 80 minutes, and the dezincification production batching material contains 80% zinc-containing dust sludge and 20% coke oven dust;

[0044] The benzopyrene content in the slag obtained from the rotary kiln was 0.006 mg / kg, and the removal rate of benzopyrene was 99.92%. The slag was used as a cement raw material. The benzopyrene content in the exhaust gas of the rotary kiln was 0, and the dioxin content in the exhaust gas was 0.015 ngTEQ / Nm 3 (The emission standard is less than 0.5ngTEQ / Nm 3 ), SO2 content is 12mg / Nm3 (The emission standard is less than 35mg / Nm 3 ), NO x Content is 20mg / Nm 3 (The emission standard is less than 50mg / Nm 3 ).

[0045] Comparative Example 1

[0046] The present embodiment provides a method for resource utilization of benzopyrene sludge in a dezincification rotary kiln, the method comprising: mixing a river dredging sludge having a benzopyrene content of 7.99 mg / kg with a dezincification production batching material at a dry basis mass ratio of 0.5:1, conveying the obtained mixture to a rotary kiln with a processing capacity of 800 tons / day for processing, wherein the temperature at the kiln tail of the rotary kiln is 600°C, the temperature in the kiln is 1150°C, and the temperature at the kiln head is 650°C, the time for each part of the rotary kiln to maintain above 1000°C is 30 minutes, the total time for the mixture to stay in the rotary kiln is 80 minutes, and the dezincification production batching material contains 75% zinc-containing dust sludge and 25% coke oven dust;

[0047] The benzopyrene content in the slag obtained from the rotary kiln was 1.13 mg / kg, and the removal rate of benzopyrene was 85.86%. The slag was used as a cement raw material. The benzopyrene content in the exhaust gas of the rotary kiln was 0, and the dioxin content in the exhaust gas was 0.02 ngTEQ / Nm 3 (The emission standard is less than 0.5ngTEQ / Nm 3 ), SO2 content is 15mg / Nm 3 (The emission standard is less than 35mg / Nm 3 ), NO x Content: 23.5mg / Nm 3 (The emission standard is less than 50mg / Nm 3 ).

[0048] Comparative Example 2

[0049] The present embodiment provides a method for resource utilization of benzopyrene sludge in a dezincification rotary kiln, the method comprising: mixing a river dredging sludge having a benzopyrene content of 8.42 mg / kg with a dezincification production batching material at a dry basis mass ratio of 0.3:1, conveying the obtained mixture to a rotary kiln with a processing capacity of 800 tons / day for processing, wherein the temperature at the kiln tail of the rotary kiln is 850°C, the temperature in the kiln is 1220°C, and the temperature at the kiln head is 800°C, the time for each part of the rotary kiln to maintain above 1000°C is 10 minutes, the total time for the mixture to stay in the rotary kiln is 30 minutes, and the dezincification production batching material contains 80% zinc-containing dust sludge and 20% coke oven dust;

[0050] The benzopyrene content in the slag obtained from the rotary kiln was 1.27 mg / kg, and the removal rate of benzopyrene was 84.92%. The slag was used as a cement raw material. The benzopyrene content in the exhaust gas of the rotary kiln was 0, and the dioxin content in the exhaust gas was 0.019 ngTEQ / Nm 3 (The emission standard is less than 0.5ngTEQ / Nm 3 ), SO2 content is 12mg / Nm 3 (The emission standard is less than 35mg / Nm 3 ), NO x Content is 21mg / Nm 3 (The emission standard is less than 50mg / Nm 3 ).

[0051] It can be seen from the results of Examples 1-5 and Comparative Examples 1-2 that the present invention treats a certain mass of benzopyrene-containing sludge and a dezincification production batch containing zinc dust sludge in a rotary kiln for synergistic harmless treatment. Since the dezincification rotary kiln is a high-zinc, high-iron combustion environment, the combustion flue gas contains a large amount of fine particles of zinc oxide, and zinc oxide is a photocatalyst that can accelerate the oxidative thermal decomposition of organic pollutants such as benzopyrene, and promote the synergistic effect of benzopyrene-containing dredging sludge and zinc dust sludge; at the same time, the temperature in the rotary kiln is controlled. The degree and residence time of all materials in the rotary kiln are improved, and the sludge containing benzopyrene is effectively degraded. The method of the present invention is used to treat the sludge containing benzopyrene, and the removal rate of benzopyrene can reach more than 95%. At the same time, during the treatment process, benzopyrene is completely decomposed into carbon dioxide and water, and no secondary pollutants are generated. It has the advantages of being green and environmentally friendly. The treated slag can be used as clinker for making cement, and the quality of the secondary zinc oxide product recovered by the rotary kiln remains unchanged. At the same time, the flue gas discharged does not contain benzopyrene, and SO2 and NO in the flue gas are reduced. x The contents of pesticides, dioxins, etc. are within the standard range.

[0052] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for resource utilization of benzopyrene sludge by using a dezincification rotary kiln. It is characterized in that The method comprises: mixing benzopyrene-containing sludge with dezincification production ingredients to obtain a mixture, wherein the mass of the benzopyrene-containing sludge is ≤40% based on the total mass of the mixture being 100%, conveying the mixture to a rotary kiln at 600-1300° C. for treatment, wherein the total residence time of the mixture in the rotary kiln is ≥60 minutes, and the dezincification production ingredients contain zinc-containing dust sludge.

2. The method for resource utilization of benzopyrene sludge in cooperation with the dezincification rotary kiln according to claim 1, It is characterized in that Based on the total mass of the mixed material being 100%, the mass of the benzopyrene-containing sludge is 5-10%.

3. The method for resource utilization of benzopyrene sludge in cooperation with the dezincification rotary kiln according to claim 1, It is characterized in that The content of benzopyrene in the benzopyrene-containing sludge is 5-10 mg / kg.

4. The method for resource utilization of benzopyrene sludge in cooperation with the dezincification rotary kiln according to claim 1, It is characterized in that The dezincification production batch contains 70-85% by mass of zinc-containing dust mud.

5. The method for resource utilization of benzopyrene sludge in cooperation with the dezincification rotary kiln according to claim 1, It is characterized in that The temperature at the kiln tail of the rotary kiln is 600-1000°C, the temperature in the kiln is 1000-1300°C, and the temperature at the kiln head is 650-1000°C. The temperature of the rotary kiln is maintained at 1000-1300°C for ≥10min.

6. The method for resource utilization of benzopyrene sludge in cooperation with the dezincification rotary kiln according to claim 1, It is characterized in that The total residence time of the mixed material in the rotary kiln is 70-90 min.

7. The method for resource utilization of benzopyrene sludge in cooperation with a dezincification rotary kiln according to claim 5, It is characterized in that The temperature of the rotary kiln is maintained at 1000-1300° C. for 20-30 minutes.

8. The method for resource utilization of benzopyrene sludge in cooperation with a dezincification rotary kiln according to claim 4, It is characterized in that The dezincification production batch contains 80% by mass of zinc-containing dust and 20% by mass of coke oven dust.

9. The method for resource utilization of benzopyrene sludge in cooperation with a dezincification rotary kiln according to claim 4, It is characterized in that The dezincification production batch contains 80% by mass zinc-containing dust and 20% by mass coal powder.

10. The method for resource utilization of benzopyrene sludge in cooperation with a dezincification rotary kiln according to claim 1, It is characterized in that The kiln slag obtained after the rotary kiln treatment is used as cement clinker for making cement.