A method for preparing aromatic compounds and co-producing heavy metal adsorbents from waste thermosetting phenolic resin by in-situ catalytic pyrolysis of red mud.

Abstract

The present application belongs to the technical field of multi-source pollutant collaborative prevention and treatment, and particularly relates to a method for preparing aromatic compounds and co-producing heavy metal adsorption materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin with red mud. The method for preparing aromatic compounds and co-producing heavy metal adsorption materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin with red mud provided by the present application first modifies the red mud to obtain a low-cost activated red mud catalyst material; then the waste thermosetting phenolic resin and the activated red mud catalyst material are mixed as raw materials and placed in a catalytic upgrading reactor to realize catalytic degradation and reuse of the waste thermosetting phenolic resin and co-production of heavy metal adsorption materials rich in zero-valent iron; finally, the prepared adsorption materials are used in the treatment of electroplating industrial wastewater containing heavy metals; and the whole technical method process is simple in operation and strong in generalization.

Description

Technical Field

[0001] This invention belongs to the field of multi-source pollutant synergistic prevention and control technology, specifically relating to a method for preparing aromatic compounds and heavy metal adsorbent materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin from red mud. Background Technology

[0002] Phenolic resins are dimer compounds mainly formed by the condensation reaction of phenol and formaldehyde. They are divided into thermoplastic phenolic resins and thermosetting phenolic resins, and are widely used in the automotive, construction, home appliance, machinery manufacturing, and aerospace industries. In recent years, my country's production and demand for phenolic resins have steadily increased, maintaining a tight balance between supply and demand, while also generating a large amount of waste phenolic resin. It is worth noting that thermosetting phenolic resins do not soften after being cured by heat, and their complex chemical properties and thermal stability are not conducive to recycling. Therefore, how to efficiently recycle waste thermosetting phenolic resins is of great significance for resource reuse and reducing environmental pollution.

[0003] The main technologies for recycling waste thermosetting phenolic resins include physical recycling, chemical recycling, heat recovery, and pyrolysis recycling. Among these, pyrolysis recycling technology is characterized by high reaction conversion and recovery efficiency and high effective carbon conversion rate, making it one of the feasible technologies for efficient recycling of thermosetting phenolic resins. However, it still faces challenges such as difficulty in controlling the pyrolysis process and poor product quality. Currently, in-situ catalytic pyrolysis technology can enhance heat and mass transfer processes, reduce reaction activation energy, and modulate the pyrolysis gas reconstruction path and carbon-based material framework by introducing catalysts, thereby achieving the production of high-value-added products. Furthermore, by improving carbon utilization and reducing energy input, it directly or indirectly promotes the reduction of carbon emissions from the pyrolysis system. Therefore, developing novel low-carbon pyrolysis technologies suitable for thermosetting phenolic resins is crucial for achieving their efficient recycling.

[0004] Red mud is a waste product from the alumina industry, and its large-scale accumulation causes serious environmental pollution and resource waste. Currently, modification methods such as acid treatment and alkali activation can improve the pore structure and enhance catalytic active sites of red mud, potentially demonstrating unique advantages in the catalytic pyrolysis conversion of waste thermosetting phenolic resins. Therefore, achieving precise control over the in-situ catalytic pyrolysis of waste thermosetting phenolic resins to produce aromatic compounds and co-produced heavy metal adsorbent materials is of great significance for the development of a synergistic pollution reduction and carbon reduction technology system for multiple pollutants, including waste thermosetting phenolic resins, red mud, and heavy metals. Summary of the Invention

[0005] The purpose of this invention is to provide a method for producing aromatic compounds and heavy metal adsorbent materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin from red mud. This method achieves efficient recovery of waste thermosetting phenolic resin, industrial catalytic application of red mud, and treatment of wastewater from electroplating industries containing heavy metals, providing a technical reference for the synergistic reduction and carbonization of multiple pollutants.

[0006] The method for preparing aromatic compounds and co-producing heavy metal adsorbent materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin from red mud according to the present invention comprises the following steps:

[0007] (1) First, red mud was acid-leached with citric acid, then adjusted to neutral with ammonia water, then filtered, washed with ethanol and deionized water and dried, and finally the obtained solid was calcined at high temperature to obtain activated red mud catalyst material.

[0008] (2) The activated red mud catalyst material obtained in step (1) is mixed with waste thermosetting phenolic resin in a certain proportion and then placed in a catalytic upgrading reactor for in-situ catalytic pyrolysis reaction to produce aromatic compounds and adsorbent materials.

[0009] (3) The adsorbent material prepared in step (2) is added to the electroplating industrial wastewater containing heavy metals for adsorption reaction, so as to achieve synergistic pollution reduction and carbon reduction treatment of multiple pollutants.

[0010] in:

[0011] The red mud raw material used in step (1) comes from the solid waste residue produced by the Bayer process for alumina preparation. The specific chemical composition by mass percentage is as follows: Na2O 13.01-13.92%, MgO 0.21-0.35%, Al2O3 22.58-23.20%, SiO2 18.75-20.12%, Fe2O3 22.50-23.24%, K2O 0.38-0.47%, TiO2 1.85-2.23%, CaO 8.79-9.52%, ZrO2 0.06-0.09%, and loss on ignition 8.87-9.86%.

[0012] In step (1), the concentration of citric acid is 1-3 mol / L and the mass fraction of ammonia is 36%.

[0013] In step (1), the mass-to-volume ratio of red mud to citric acid is 5:20-60, with units of g / mL.

[0014] In step (1), the acid leaching temperature is 80-83℃ and the acid leaching time is 40-45min.

[0015] In step (1), the drying temperature is 100-105℃ and the drying time is 24h.

[0016] In step (1), the high-temperature roasting is carried out by raising the temperature from room temperature to 600-800℃ at a rate of 5℃ / min for 2-4 hours.

[0017] The activation treatment of red mud in step (1) can effectively remove Na and Ca elements from the red mud, reduce the strong alkalinity of the red mud, promote structural reorganization, and at the same time make the red mud have a high specific surface area, well-developed pore characteristics, abundant acidic sites and catalytically active metal oxide components. These enhanced structural characteristics can play a role in the catalytic reforming of thermosetting phenolic resin pyrolysis gas.

[0018] In step (2), the mass ratio of waste thermosetting phenolic resin to activated red mud catalyst material is 0.5-2:1.

[0019] In step (2), the reaction atmosphere during the in-situ catalytic pyrolysis reaction is either nitrogen or argon, and the gas flow rate is 100 mL / min. The temperature is increased to the in-situ catalytic pyrolysis reaction temperature at a rate of 10 °C / min. The in-situ catalytic pyrolysis reaction temperature is 450-650 °C, and the in-situ catalytic pyrolysis reaction time is 20-40 min.

[0020] The waste thermosetting phenolic resin mentioned in step (2) is one of the following: waste phenolic resin, waste bisphenol A phenolic resin, or waste biphenyl aryl phenolic resin.

[0021] In step (2), the liquid product in the in-situ catalytic pyrolysis product is an aromatic compound, and the solid product in the in-situ catalytic pyrolysis product is an adsorbent material.

[0022] In step (3), the mass ratio of the adsorbent to the volume of the electroplating wastewater containing heavy metals in the adsorption reaction is 2.3-3.0:1, with units of mg / mL. The adsorption reaction time is 12-24h, and the adsorption reaction temperature is 25-35℃.

[0023] The electroplating industrial wastewater containing heavy metals mentioned in step (3) has a zinc ion content ≤50mg / L, a copper ion content ≤30mg / L, and a pH value of 3.0-3.5.

[0024] In step (3), the multi-source pollutants refer to waste thermosetting phenolic resin, red mud, and electroplating industrial wastewater containing heavy metals.

[0025] The method for producing aromatic compounds and heavy metal adsorbent materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin in red mud according to the present invention has the following advantages. On the one hand, the rich active metal oxides (Fe2O3, Al2O3 and TiO2, etc.) and well-developed pore structure of modified red mud can promote the deoxygenation and quality improvement of the pyrolysis gas of waste thermosetting phenolic resin, and increase the proportion of aromatic compounds in the liquid products. At the same time, the waste thermosetting phenolic resin can be used as a carbon source to reduce the valence state of the iron oxide compounds rich in modified red mud, and synthesize a high-efficiency zero-valent iron adsorbent material for the treatment of electroplating industrial wastewater containing heavy metals, thereby enhancing the application value of the catalytic pyrolysis products.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The method for producing aromatic compounds and heavy metal adsorbent materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin in red mud according to the present invention firstly modifies the red mud to obtain a low-cost activated red mud catalyst material; then, the waste thermosetting phenolic resin and the activated red mud catalyst material are mixed and placed in a catalytic upgrading reactor to realize the catalytic degradation and reuse of waste thermosetting phenolic resin and the co-production of heavy metal adsorbent materials rich in zero-valent iron; finally, the prepared adsorbent material is used in the treatment of wastewater from electroplating industry containing heavy metals; the entire technical process is simple to operate and has strong scalability.

[0028] (2) The method for producing aromatic compounds and co-producing heavy metal adsorbent materials from waste thermosetting phenolic resin by in-situ catalytic pyrolysis of red mud according to the present invention utilizes low-cost activated red mud catalyst materials to upgrade the pyrolysis gas of waste thermosetting phenolic resin, thereby achieving the targeted preparation of high-value aromatic compounds such as phenol and aromatic hydrocarbons. Simultaneously, the carbothermic reduction process during catalytic pyrolysis modulates the valence state distribution of iron elements in the activated red mud, and the activated red mud acts as an "in-situ activator," promoting the development of the pore structure of carbon materials, thus realizing the targeted preparation of carbon-iron composite adsorbent materials. The resulting novel low-carbon pyrolysis technology based on the targeted preparation of high-value-added aromatic compounds and carbon-iron composite adsorbent materials directly or indirectly promotes carbon emission reduction in the pyrolysis system by improving carbon utilization and reducing reaction activation energy.

[0029] (3) The method for producing aromatic compounds and heavy metal adsorbent materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin in red mud according to the present invention has shown excellent performance in the field of treatment of electroplating industrial wastewater containing heavy metals. It realizes the synergistic pollution reduction and carbon reduction treatment of waste thermosetting phenolic resin-red mud-electroplating industrial wastewater containing heavy metals. It has certain promotion and utilization value from the perspective of synergistic prevention and control of multi-source pollutants and sustainable development. Detailed Implementation

[0030] The present invention will be further described below with reference to embodiments.

[0031] Example 1

[0032] The method for preparing aromatic compounds and co-producing heavy metal adsorbent materials by in-situ catalytic pyrolysis of waste thermosetting phenolic resin from red mud, as described in Example 1, consists of the following steps:

[0033] (1) Take 5g of red mud raw material and mix it with 30mL of citric acid solution (concentration of 2mol / L). Soak and digest it at 80℃ for 45min. Then, add 36% ammonia water dropwise under uniform stirring to adjust to neutral. Then wash it three times with ethanol and deionized water and dry it in an air drying oven at 105℃ for 24h. Finally, calcine the obtained solid in a muffle furnace at a heating rate of 5℃ / min from room temperature to 600℃ for 4h to obtain activated red mud catalyst material.

[0034] in:

[0035] The red mud raw material used in Example 1 was derived from solid waste generated during the Bayer process for alumina production. Its specific chemical composition, by mass percentage, is as follows: Na₂O 13.47%, MgO 0.28%, Al₂O₃ 22.85%, SiO₂ 19.44%, Fe₂O₃ 22.87%, K₂O 0.43%, TiO₂ 2.04%, CaO 9.16%, ZrO₂ 0.08%, and loss on ignition 9.38%.

[0036] The activated red mud catalyst material has the following specific chemical composition by mass percentage: Na2O 0.18%, MgO 0.25%, Al2O3 22.24%, SiO2 25.89%, Fe2O3 39.40%, K2O 0.34%, TiO2 2.81%, CaO 1.87%, ZrO2 0.16%, and loss on ignition 6.86%.

[0037] (2) Activated red mud catalyst material and waste phenolic resin were mixed at a mass ratio of 1:1 and placed in a catalytic upgrading reactor for catalytic pyrolysis to produce aromatic compounds and co-product adsorbent materials. The reaction atmosphere was nitrogen, the nitrogen flow rate was 100 mL / min, the reaction temperature was 550℃, the heating rate was 10℃ / min, and the pyrolysis time was 30 min. In the liquid product of the in-situ catalytic pyrolysis, the relative content of aromatics was 33.23%, the relative content of phenolic compounds was 59.56%, and the selectivity of aromatic compounds reached 92.79%. The solid product of the in-situ catalytic pyrolysis was used as a heavy metal adsorbent material.

[0038] (3) The zinc ion content in the electroplating industrial wastewater containing heavy metals was 25 mg / L, the copper ion content was 20 mg / L, and the pH value was 3.5. 50 mg of the heavy metal adsorbent material produced by pyrolysis was added to 21.5 mL of the electroplating industrial wastewater containing heavy metals, and the mixture was shaken at 150 r / min in a 35℃ constant temperature shaker for 12 h. The removal efficiency was then calculated by measuring the zinc and copper ion concentrations in the upper suspension using inductively coupled plasma atomic emission spectrometry (ICP-AES). The zinc ion removal rate was 98.76%, and the copper ion removal rate was 98.13%.

[0039] Example 2

[0040] The method for preparing aromatic compounds and co-producing heavy metal adsorbent materials from waste thermosetting phenolic resin by in-situ catalytic pyrolysis of red mud as described in Example 2 consists of the following steps:

[0041] (1) Take 5g of red mud raw material and mix it with 60mL of citric acid solution (concentration of 1mol / L). Soak and digest it at 81℃ for 43min. Then, add 36% ammonia water dropwise under uniform stirring to adjust to neutral. Then wash it three times with ethanol and deionized water and dry it in an air drying oven at 100℃ for 24h. Finally, calcine the obtained solid in a muffle furnace at a heating rate of 5℃ / min from room temperature to 700℃ for 3h to obtain activated red mud catalyst material.

[0042] in:

[0043] The red mud raw material used comes from the solid waste residue produced by the Bayer process for alumina production. Its specific chemical composition, by mass percentage, is as follows: Na₂O 13.01%, MgO 0.35%, Al₂O₃ 22.58%, SiO₂ 20.12%, Fe₂O₃ 22.50%, K₂O 0.47%, TiO₂ 2.23%, CaO 8.79%, ZrO₂ 0.09%, and loss on ignition 9.86%.

[0044] The activated red mud catalyst material has the following specific chemical composition by mass percentage: Na2O 0.20%, MgO 0.31%, Al2O3 22.17%, SiO2 27.53%, Fe2O3 38.61%, K2O 0.33%, TiO2 3.02%, CaO 1.24%, ZrO2 0.18%, and loss on ignition 6.41%.

[0045] (2) Activated red mud catalyst material and waste bisphenol A phenolic resin were mixed at a mass ratio of 2:1 and placed in a catalytic upgrading reactor for catalytic pyrolysis to produce aromatic compounds as adsorbent materials. The reaction atmosphere was nitrogen, the nitrogen flow rate was 100 mL / min, the reaction temperature was 450℃, the heating rate was 10℃ / min, and the pyrolysis time was 40 min. In the liquid product of the in-situ catalytic pyrolysis, the relative content of aromatics was 34.27%, the relative content of phenolic compounds was 58.45%, and the selectivity of aromatic compounds reached 92.72%. The solid product of the in-situ catalytic pyrolysis was used as a heavy metal adsorbent material.

[0046] (3) The zinc ion content in the electroplating industrial wastewater containing heavy metals was 35 mg / L, the copper ion content was 25 mg / L, and the pH value was 3.3. 60 mg of the heavy metal adsorbent material produced by pyrolysis was added to 22 mL of the heavy metal-containing electroplating industrial wastewater, and the mixture was shaken at 150 r / min in a 25℃ air bath constant temperature shaker for 24 h. The removal efficiency was then calculated by measuring the zinc and copper ion concentrations in the upper suspension using inductively coupled plasma atomic emission spectrometry (ICP-AES). The zinc ion removal rate was 99.02%, and the copper ion removal rate was 98.89%.

[0047] Example 3

[0048] The method for preparing aromatic compounds and co-producing heavy metal adsorbent materials from waste thermosetting phenolic resin by in-situ catalytic pyrolysis of red mud as described in Example 3 consists of the following steps:

[0049] (1) Take 5g of red mud raw material and mix it with 20mL of citric acid solution (concentration of 3mol / L). Soak and digest it at 83℃ for 40min. Then, add 36% ammonia water dropwise under uniform stirring to adjust to neutral. Then wash it three times with ethanol and deionized water and dry it in an air drying oven at 103℃ for 24h. Finally, calcine the obtained solid in a muffle furnace at a heating rate of 5℃ / min from room temperature to 800℃ for 2h to obtain activated red mud catalyst material.

[0050] in:

[0051] The red mud raw material used comes from the solid waste residue produced by the Bayer process for alumina production. Its specific chemical composition, by mass percentage, is as follows: Na₂O 13.92%, MgO 0.21%, Al₂O₃ 23.20%, SiO₂ 18.75%, Fe₂O₃ 23.24%, K₂O 0.38%, TiO₂ 1.85%, CaO 9.52%, ZrO₂ 0.06%, and loss on ignition 8.87%.

[0052] The activated red mud catalyst material has the following specific chemical composition by mass percentage: Na2O 0.25%, MgO 0.17%, Al2O3 22.68%, SiO2 26.59%, Fe2O3 39.32%, K2O 0.25%, TiO2 2.61%, CaO 1.36%, ZrO2 0.14%, and loss on ignition 6.63%.

[0053] (2) Activated red mud catalyst material and waste biphenyl aralkyl phenolic resin were mixed at a mass ratio of 1:2 and placed in a catalytic upgrading reactor for catalytic pyrolysis to produce aromatic compounds as adsorbent materials. The reaction atmosphere was nitrogen, the nitrogen flow rate was 100 mL / min, the reaction temperature was 650℃, the heating rate was 10℃ / min, and the pyrolysis time was 20 min. In the liquid product of the in-situ catalytic pyrolysis, the relative content of aromatics was 38.19%, the relative content of phenolic compounds (phenol, methylphenol, and dimethylphenol) was 57.20%, and the selectivity of aromatic compounds reached 95.39%. The solid product of the in-situ catalytic pyrolysis was used as a heavy metal adsorbent material.

[0054] (3) The industrial wastewater from electroplating containing heavy metals had a zinc ion content of 45 mg / L, a copper ion content of 30 mg / L, and a pH of 3.0. 69 mg of the heavy metal adsorbent produced by pyrolysis was added to 23 mL of the electroplating wastewater containing heavy metals, and the mixture was shaken at 150 r / min in a 30℃ air bath constant temperature shaker for 18 h. The removal efficiency was then calculated by measuring the zinc and copper ion concentrations in the upper suspension using inductively coupled plasma atomic emission spectrometry (ICP-AES). The zinc ion removal rate was 99.12%, and the copper ion removal rate was 99.08%.

[0055] Comparative Example 1

[0056] The method for preparing aromatic compounds and co-producing heavy metal adsorbent materials from waste thermosetting phenolic resin by in-situ catalytic pyrolysis of red mud as described in Comparative Example 1 comprises the following steps:

[0057] (1) 5g of red mud raw material and waste phenolic resin were mixed at a mass ratio of 1:1 and placed in a catalytic upgrading reactor for catalytic pyrolysis to produce aromatic compounds and co-product adsorbent materials. The reaction atmosphere was nitrogen, the nitrogen flow rate was 100mL / min, the reaction temperature was 550℃, the heating rate was 10℃ / min, and the pyrolysis time was 30min. In the liquid product of the in-situ catalytic pyrolysis, the relative content of aromatics was 17.81%, the relative content of phenolic compounds was 71.94%, and the selectivity of aromatic compounds reached 89.75%. The solid product of the in-situ catalytic pyrolysis was used as a heavy metal adsorbent material.

[0058] The red mud raw material used comes from solid waste generated during the Bayer process for alumina production. Its specific chemical composition, by mass percentage, is as follows: Na₂O 13.47%, MgO 0.28%, Al₂O₃ 22.85%, SiO₂ 19.44%, Fe₂O₃ 22.87%, K₂O 0.43%, TiO₂ 2.04%, CaO 9.16%, ZrO₂ 0.08%, and loss on ignition 9.38%.

[0059] (2) The zinc ion content in the electroplating industrial wastewater containing heavy metals was 25 mg / L, the copper ion content was 20 mg / L, and the pH value was 3.5. 50 mg of the heavy metal adsorbent material produced by pyrolysis was added to 21.5 mL of the electroplating industrial wastewater containing heavy metals, and the mixture was shaken at 150 r / min in a 35℃ constant temperature shaker for 12 h. The removal efficiency was then calculated by measuring the zinc and copper ion concentrations in the upper suspension using inductively coupled plasma atomic emission spectrometry (ICP-AES). The zinc ion removal rate was 96.45%, and the copper ion removal rate was 96.32%.

[0060] Comparative Example 2

[0061] The method for preparing aromatic compounds and co-producing heavy metal adsorbent materials from pyrolysis waste thermosetting phenolic resin as described in Comparative Example 2 comprises the following steps:

[0062] (1) Waste phenolic resin was placed in a catalytic upgrading reactor for catalytic pyrolysis to produce aromatic compounds and adsorbent materials. The reaction atmosphere was nitrogen, the nitrogen flow rate was 100 mL / min, the reaction temperature was 550℃, the heating rate was 10℃ / min, and the pyrolysis time was 30 min. In the liquid products of the pyrolysis, the relative content of aromatics was 4.33%, the relative content of phenolic compounds was 86.53%, and the selectivity of aromatic compounds reached 90.86%. The phenolic resin carbon obtained from in-situ catalytic pyrolysis was used as a heavy metal adsorbent.

[0063] (2) The zinc ion content in the electroplating industrial wastewater containing heavy metals was 25 mg / L, the copper ion content was 20 mg / L, and the pH value was 3.5. 50 mg of the heavy metal adsorbent produced by pyrolysis was added to 21.5 mL of the electroplating industrial wastewater containing heavy metals, and the mixture was shaken at 150 r / min in a 35℃ constant temperature shaker for 12 h. The removal efficiency was then calculated by measuring the zinc and copper ion concentrations in the upper suspension using inductively coupled plasma atomic emission spectrometry (ICP-AES). The zinc ion removal rate was 95.46%, and the copper ion removal rate was 95.71%.

[0064] In summary, Comparative Example 1, by directly pyrolyzing the red mud raw material with the waste thermosetting phenolic resin without further activation treatment, is not conducive to the formation of aromatic compounds and reduces the heavy metal removal efficiency. Comparative Example 2, by not adding activated red mud during the pyrolysis of the waste thermosetting phenolic resin, results in a significant reduction in the content of aromatic compounds and a decrease in the heavy metal removal efficiency.

Claims

1. A method for producing aromatic compounds co-production of heavy metal adsorption material from waste thermosetting phenolic resin by in-situ catalytic pyrolysis of red mud, characterized in that: Consists of the following steps: (1) First, the red mud is acid leached with citric acid, adjusted to neutral with ammonia water, then filtered, washed with ethanol and deionized water, and dried, and finally the obtained solid is calcined at high temperature to prepare an activated red mud catalyst material; (2) The activated red mud catalyst material prepared in step (1) is mixed with waste thermosetting phenolic resin in a certain proportion and placed in a catalytic upgrading reactor to carry out in-situ catalytic pyrolysis reaction to produce aromatic compounds and adsorbent materials; (3) The adsorbent material prepared in step (2) is added to electroplating industrial wastewater containing heavy metals to carry out adsorption reaction, realizing the collaborative pollution reduction and carbon reduction treatment of multi-source pollutants; In step (1), the red mud raw material comes from the solid waste generated in the preparation of alumina by the Bayer process, and the specific chemical composition is as follows in mass percentage: Na2O 13.01-13.92%, MgO 0.21-0.35%, Al2O3 22.58-23.20%, SiO2 18.75-20.12%, Fe2O3 22.50-23.24%, K2O 0.38-0.47%, TiO2 1.85-2.23%, CaO 8.79-9.52%, ZrO2 0.06-0.09%, and loss on ignition 8.87-9.86%.

2. The process for production of aromatic compounds co-producing heavy metal adsorbent material from waste thermosetting phenol-formaldehyde resin by in-situ catalytic pyrolysis of red mud according to claim 1, characterized in that: In step (1), the concentration of citric acid is 1-3 mol / L, and the mass fraction of ammonia water is 36%; In step (1), the mass-volume ratio of red mud to citric acid is 5:20-60 g / mL; In step (1), the acid leaching temperature is 80-83℃, and the acid leaching time is 40-45 min.

3. The process for production of aromatic compounds co-producing heavy metal adsorbent material from waste thermosetting phenol-formaldehyde resin by in-situ catalytic pyrolysis of red mud according to claim 1, characterized in that: In step (1), the drying treatment temperature is 100-105℃, and the drying treatment time is 24 h; In step (1), the high-temperature calcination is carried out at a heating rate of 5℃ / min from room temperature to 600-800℃ for 2-4 h.

4. The process for production of aromatic compounds co-producing heavy metal adsorbent material from waste thermosetting phenol-formaldehyde resin by in-situ catalytic pyrolysis of red mud as claimed in claim 1, wherein: In step (2), the mass ratio of waste thermosetting phenolic resin to activated red mud catalyst material is 0.5-2:

1.

5. A process for the production of aromatic compounds co-producing heavy metal adsorbent material from waste thermoset phenol-formaldehyde resin in situ catalytic pyrolysis of red mud as claimed in claim 1, wherein: In the in-situ catalytic pyrolysis reaction process of step (2), the reaction atmosphere is one of nitrogen or argon, the gas flow rate is 100 mL / min, the temperature is raised to the in-situ catalytic pyrolysis temperature at a heating rate of 10℃ / min, the in-situ catalytic pyrolysis temperature is 450-650℃, and the in-situ catalytic pyrolysis time is 20-40 min.

6. A process for the production of aromatic compounds co-producing heavy metal adsorbent material from waste thermoset phenol-formaldehyde resin in situ catalytic pyrolysis of red mud according to claim 1, characterized by: In step (2), the waste thermosetting phenolic resin is one of waste phenol type phenolic resin, waste bisphenol A phenolic resin, or waste diphenyl aralkyl type phenolic resin.

7. A process for the production of aromatic compounds co-producing heavy metal adsorbent material from waste thermoset phenol-formaldehyde resin in situ catalytic pyrolysis of red mud according to claim 1, characterized by: In step (2), the liquid product in the in-situ catalytic pyrolysis product is an aromatic compound, and the solid product in the in-situ catalytic pyrolysis product is an adsorbent material.

8. A process for the production of aromatic compounds co-producing heavy metal adsorbent material from waste thermoset phenol-formaldehyde resin in situ catalytic pyrolysis of red mud according to claim 1, characterized by: In step (3), the mass of adsorbent to the volume of electroplating industrial wastewater containing heavy metals is 2.3-3.0:1 mg / mL, the adsorption reaction time is 12-24 h, and the adsorption reaction temperature is 25-35℃.

9. A process for the production of aromatic compounds co-producing heavy metal adsorbent material from waste thermoset phenol-formaldehyde resin in situ catalytic pyrolysis of red mud according to claim 1, characterized by: In step (3), the content of zinc ions in the electroplating industrial wastewater containing heavy metals is ≤50 mg / L, the content of copper ions is ≤30 mg / L, and the pH value is 3.0-3.5.