Catalyst for deacidification treatment of acid-containing wastewater, and preparation method and application thereof

Abstract

The present application relates to the technical field of catalyst and its preparation, and is a kind of catalyst for acid-containing wastewater deacidification treatment and its preparation method and application, the former is carried out according to the following steps: metal oxide, sodium hydroxide and sodium carbonate are uniformly mixed and ground, to obtain first mixed powder;Deionized water is added to the first mixed powder, and stirred uniformly, the powder is kneaded into a lump, and then extruded into a strip, to obtain a strip mixture;The strip mixture is dried and calcined to obtain a catalyst for acid-containing wastewater deacidification treatment.The mixture of metal oxide, sodium hydroxide and sodium carbonate is dried and calcined, the reaction condition is safe and mild, the carrier activation is not needed, it is simple and easy to control, the raw material cost is low, the synthesized catalyst can be used in acid-containing wastewater deacidification reaction, the product activity can remain stable for a long time, the obtained catalyst can be regenerated under air atmosphere, and the activity of the regenerated catalyst can be completely recovered.

Description

Technical Field

[0001] This invention relates to the field of catalysts and their preparation technology, specifically a catalyst for the deacidification treatment of acidic wastewater, its preparation method, and its application. Background Technology

[0002] Methanol is an important chemical raw material, used in the production of various important chemical intermediates such as ethylene, propylene, and aromatics. However, the reactions involving methanol produce a large amount of wastewater. This is because the methanol reaction generates organic acids (mainly acetic acid), which dissolve in the wastewater, resulting in a pH value between 2.0 and 5.0 for the generated water, which does not meet wastewater discharge standards.

[0003] To address this issue, industrial production processes often involve adding alkaline substances to the wastewater to reduce its acidity. These alkaline substances include corrosion inhibitors or sodium hydroxide solution. However, long-term production has revealed that alkaline injection systems are difficult to control, and excessive alkaline injection can damage the tower walls, shorten the lifespan of the quench tower, and increase investment and energy consumption. Therefore, it is essential to develop a technology to reduce the acidity of the water produced from the methanol reaction, laying a solid foundation for the application and promotion of this technology in the future.

[0004] Using alkaline earth metal oxides or basic metal oxides as deacidification catalysts to ketoxylate carboxylic acids in wastewater can effectively reduce wastewater acidity and improve COD. Metal oxides (hydroxides or carbonates for alkali metals) exhibit excellent ketoxylation reactivity due to their rich acid-base properties. Alkaline earth metal oxides such as MgO, CaO, BaO, CaCO3, Al2O3, TiO2, MnO, Fe2O3, and CeO2 have all been used in ketoxylation reactions. Experiments show that under certain reaction conditions, these deacidification catalysts can achieve efficient removal of organic acid components, with the pH of the product water ranging from 5.0 to 7.0. Therefore, developing metal oxide deacidification catalysts and related technologies is entirely feasible.

[0005] Chinese patent document CN100363098C discloses a C2-C 12This paper discusses catalysts for the ketation of aliphatic carboxylic acids and their applications. The catalysts are characterized by using γ-alumina as a support and one or more of lanthanum, cerium, and praseodymium as active components. The specific catalyst preparation steps are as follows: First, the γ-alumina support is treated using nitric acid water treatment, calcination, or vacuum methods. Then, oxides of praseodymium, neodymium, and cerium are weighed at a molar ratio of 0.1-23:0.1-30:1-30. The target mass of rare earth metal oxides is weighed and dissolved in nitric acid solution. The resulting solution is then impregnated with the support for 1-60 hours. Finally, the impregnation liquid is separated, and the solution is dried at 100-120℃ for 1-60 hours. The resulting powder is then calcined at 500-800℃ for 4-8 hours to obtain the catalyst. The aforementioned literature uses γ-alumina as the catalyst support and one or more of lanthanum, cerium, and praseodymium as active components, prepared through support activation and active component impregnation. However, this method requires a high specific surface area of ​​the carrier, and the carrier activation process involves nitric acid treatment, which is relatively environmentally unfriendly and the actual operation is complicated.

[0006] Therefore, there is a need to develop a deacidification reaction catalyst that is simple to prepare, uses inexpensive raw materials, and is environmentally friendly. Summary of the Invention

[0007] This invention provides a catalyst for the deacidification treatment of acidic wastewater, its preparation method, and its application, overcoming the shortcomings of the prior art. It can effectively solve the problems of complex preparation process, high raw material cost, and environmental unfriendliness in existing deacidification reaction catalysts.

[0008] One of the technical solutions of the present invention is achieved through the following measures: a catalyst for the deacidification treatment of acidic wastewater is prepared by the following steps: S1, mix and grind the required amounts of metal oxide, sodium hydroxide and sodium carbonate evenly to obtain the first mixed powder; S2, add the required amount of deionized water to the first mixed powder, stir evenly, knead the powder into a ball and then extrude it into strips to obtain a strip mixture; S3, the strip mixture is dried and then calcined to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0009] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The aforementioned metal oxides are one or more of trivalent metal oxides, divalent metal oxides, and modified metal oxides, wherein the trivalent metal oxides are one or more of Al2O3, Fe2O3, Mn2O3, and Ce2O3, the divalent metal oxides are one or more of CaO, MgO, and ZnO, and the modified metal oxides are one or more of Fe2O3, Cr2O3, and Ce2O3.

[0010] The aforementioned metal oxide is a mixture of trivalent metal oxide, divalent metal oxide and modified metal oxide, wherein the molar ratio of trivalent metal oxide, divalent metal oxide and modified metal oxide is 0.1 to 0.5: 1 to 5: 0.1 to 1.5.

[0011] The aforementioned metal oxide is a mixture of trivalent metal oxide, divalent metal oxide and modified metal oxide, wherein the molar ratio of trivalent metal oxide, divalent metal oxide and modified metal oxide is 0.1 to 0.3: 2 to 4: 0.6 to 1.0.

[0012] The aforementioned metal oxides are a mixture of trivalent and divalent metal oxides, wherein the molar ratio of the trivalent and divalent metal oxides is 2 to 4: 0.1 to 5: 0.6 to 1.0.

[0013] In step S1 above, the molar ratio of sodium hydroxide to sodium carbonate is 4 to 7:3 to 6, and the molar ratio of sodium hydroxide to the metal element in the metal oxide is 1.0 to 1.3:1.

[0014] In step S3 above, the drying temperature of the strip mixture is 80℃ to 140℃, the drying time is 2h to 6h, the calcination temperature of the strip mixture is 500℃ to 1000℃, and the calcination time is 2h to 10h.

[0015] In step S3 above, the drying temperature of the strip mixture is 100℃ to 120℃, the drying time is 3h to 5h, the calcination temperature of the strip mixture is 600℃ to 800℃, and the calcination time is 3h to 5h.

[0016] The second technical solution of the present invention is achieved through the following measures: a method for preparing a catalyst for the deacidification treatment of acidic wastewater, comprising the following steps: S1, mix and grind the required amounts of metal oxide, sodium hydroxide and sodium carbonate evenly to obtain the first mixed powder; S2, add the required amount of deionized water to the first mixed powder, stir evenly, knead the powder into a ball and then extrude it into strips to obtain a strip mixture; S3, the strip mixture is dried and then calcined to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0017] The third technical solution of the present invention is achieved through the following measures: the application of a catalyst for the deacidification treatment of acidic wastewater, wherein the catalyst for the deacidification treatment of acidic wastewater, after participating in the reaction and becoming deactivated, is calcined at 500°C to 800°C in an air atmosphere, and its activity is restored after calcination and it can be recycled.

[0018] This invention obtains a catalyst by drying and calcining a mixture of metal oxide, sodium hydroxide, and sodium carbonate. The reaction conditions are safe and mild, and the catalyst is simple and easy to control without the need for carrier activation. The raw material cost is low, and the synthesized catalyst can be used in the deacidification reaction of acidic wastewater. The product activity can remain stable for a long time. The obtained catalyst can also be regenerated by calcining in an air atmosphere, and the activity of the regenerated catalyst can be fully restored. Detailed Implementation

[0019] This invention is not limited to the following embodiments; specific implementation methods can be determined based on the technical solution of this invention and actual circumstances. Unless otherwise specified, all chemical reagents and chemical products mentioned in this invention are well-known and commonly used chemical reagents and chemical products in the prior art.

[0020] The present invention will be further described below with reference to embodiments: Example 1: The catalyst for deacidification treatment of acidic wastewater was prepared according to the following steps: S1, mix and grind the required amounts of metal oxide, sodium hydroxide and sodium carbonate evenly to obtain the first mixed powder; S2, add the required amount of deionized water to the first mixed powder, stir evenly, knead the powder into a ball and then extrude it into strips to obtain a strip mixture; S3, the strip mixture is dried and then calcined to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0021] This invention uses common and widely available alkaline metal oxides and alkalis as raw materials, eliminating the need for carrier activation, simplifying the preparation process, and preventing wastewater generation. The resulting catalyst for deacidification of acidic wastewater only requires calcination in a muffle furnace for 4 hours for regeneration. It achieves green production of the deacidification catalyst, yielding a catalyst for deacidification of acidic wastewater. Under reaction temperatures of 380℃ to 480℃, it can raise the pH of wastewater from 3.8 to above 6.0, meeting the requirements for factory-delivered water.

[0022] Example 2: As an optimization of the above example, the metal oxide is one or more of trivalent metal oxide, divalent metal oxide and modified metal oxide, wherein the trivalent metal oxide is one or more of Al2O3, Fe2O3, Mn2O3 and Ce2O3, the divalent metal oxide is one or more of CaO, MgO and ZnO, and the modified metal oxide is one or more of Fe2O3, Cr2O3 and Ce2O3.

[0023] Example 3: As an optimization of the above examples, the metal oxide is a mixture of trivalent metal oxide, divalent metal oxide and modified metal oxide, wherein the molar ratio of trivalent metal oxide, divalent metal oxide and modified metal oxide is 0.1 to 0.5: 1 to 5: 0.1 to 1.5.

[0024] Example 4: As an optimization of the above examples, the metal oxide is a mixture of trivalent metal oxide, divalent metal oxide and modified metal oxide, wherein the molar ratio of trivalent metal oxide, divalent metal oxide and modified metal oxide is 0.1 to 0.3: 2 to 4: 0.6 to 1.0.

[0025] Example 5: As an optimization of the above examples, the metal oxide is a mixture of trivalent metal oxide and divalent metal oxide, wherein the molar ratio of trivalent metal oxide to divalent metal oxide is 2 to 4: 0.1 to 5: 0.6 to 1.0.

[0026] Example 6: As an optimization of the above example, in step S1, the molar ratio of sodium hydroxide to sodium carbonate is 4 to 7:3 to 6, and the molar ratio of sodium hydroxide to the metal element in the metal oxide is 1.0 to 1.3:1. Preferably, the molar ratio of sodium hydroxide to the metal element in the metal oxide is 1.1 to 1.2:1.

[0027] Example 7: As an optimization of the above example, in step S3, the drying temperature of the strip mixture is 80°C to 140°C, the drying time is 2h to 6h, the calcination temperature of the strip mixture is 500°C to 1000°C, and the calcination time is 2h to 10h.

[0028] Example 8: As an optimization of the above example, in step S3, the drying temperature of the strip mixture is 100°C to 120°C and the drying time is 3h to 5h, and the calcination temperature of the strip mixture is 600°C to 800°C and the calcination time is 3h to 5h.

[0029] Example 9: The preparation method of the catalyst for the deacidification treatment of acidic wastewater is carried out according to the following steps: S1, mix and grind the required amounts of metal oxide, sodium hydroxide and sodium carbonate evenly to obtain the first mixed powder; S2, add the required amount of deionized water to the first mixed powder, stir evenly, knead the powder into a ball and then extrude it into strips to obtain a strip mixture; S3, the strip mixture is dried and then calcined to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0030] Example 10: Application of the catalyst for deacidification treatment of acidic wastewater. After the catalyst is deactivated by participating in the reaction, it is calcined at 500°C to 800°C in an air atmosphere. After calcination, its activity is restored and it can be recycled.

[0031] In this invention, the acidic wastewater mainly contains acetic acid, and the acetic acid component undergoes a significant ketylation reaction on the prepared catalyst for the deacidification treatment of acidic wastewater, mainly following the reaction pathway below: 2CH3COOH→CH3COCH3+CO2+H2O In the above reaction pathway, acetic acid undergoes decarboxylation to produce acetone and carbon dioxide, thereby reducing the acid value of the wastewater. Since the deacidification reaction occurs on the outer surface of the catalyst, and the introduction of modified metals can make the catalyst surface more stable, the catalyst structure can remain stable during the reaction.

[0032] Example 11: The catalyst for deacidification treatment of acidic wastewater was prepared according to the following steps: S1, take 11.2g of calcium oxide, 6.12g of aluminum oxide, 2.67g of iron oxide, 12.93g of sodium hydroxide, and 14.6g of sodium carbonate, mix them evenly in a mortar to obtain the first mixed powder; S2, slowly add 4g of deionized water dropwise to the first mixed powder while stirring. After the addition is complete, knead the powder into a ball and then extrude it into a strip shape to obtain a strip mixture. S3, after drying the strip mixture at 120℃ for 4 hours, it is calcined at 700℃ for 4 hours to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0033] The catalyst obtained in Example 11 for the deacidification treatment of acidic wastewater was loaded into a 50 ml fixed-bed microreactor, with a loading amount of 10 g. Acidic wastewater with a pH of 3.8 was used as raw material, and the reaction was carried out at 480°C for 1.0 h. -1 The reaction was carried out under normal pressure. After 12 hours, the pH of the product water was 7.0. The reaction was continued for 1600 hours, and the pH of the product water was 6.3.

[0034] The catalyst used for deacidification of acidic wastewater after reaction was regenerated by calcining at 550℃ for 6 hours, then reloaded into the reactor and subjected to a reaction at 480℃ for 1.0 hour. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.1. The reaction was continued for 600 hours, and the pH of the product water decreased to 6.3. The pH value could be maintained at 6.3 for 1600 hours.

[0035] Example 12: The catalyst for deacidification treatment of acidic wastewater was prepared according to the following steps: S1, take 11.2g of calcium oxide, 6.52g of aluminum oxide, 12.93g of sodium hydroxide and 14.6g of sodium carbonate, mix them evenly in a mortar to obtain the first mixed powder; S2, slowly add 4g of deionized water dropwise to the first mixed powder while stirring. After the addition is complete, knead the powder into a ball and then extrude it into a strip shape to obtain a strip mixture. S3, after drying the strip mixture at 120℃ for 4 hours, it is calcined at 700℃ for 4 hours to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0036] The methanol-coupled light hydrocarbon reaction catalyst and the catalyst obtained in Example 12 for the deacidification treatment of acidic wastewater were loaded into a 50 ml fixed-bed microreactor. The former was loaded at a rate of 24 g, and the latter at a rate of 10 g. Methanol and raffinate oil were used as feedstocks, with 36% by mass of deionized water added to the methanol. The reaction was carried out at 480 °C for 1.0 h. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.4. The reaction was continued for 400 hours, and the pH of the product water was 6.2.

[0037] The methanol-coupled light hydrocarbon catalyst and the catalyst used for deacidification of acidic wastewater (Example 12) after the reaction were regenerated by calcination at 550°C for 6 hours, and then reloaded into the reactor and subjected to calcination at 480°C for 1.0 hour. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.2. The reaction was continued for 400 hours, and the pH of the product water was 6.1.

[0038] Example 13: The catalyst for deacidification treatment of acidic wastewater was prepared according to the following steps: S1, take 11.2g of calcium oxide, 6.12g of aluminum oxide, 1.07g of iron oxide (modified metal oxide), 12.93g of sodium hydroxide, and 14.6g of sodium carbonate, mix them evenly in a mortar to obtain the first mixed powder; S2, slowly add 4g of deionized water dropwise to the first mixed powder while stirring. After the addition is complete, knead the powder into a ball and then extrude it into a strip shape to obtain a strip mixture. S3. After drying the strip-shaped mixture at 120°C for 4 hours, it is calcined at 800°C for 4 hours to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0039] The catalyst obtained in Example 13 for the deacidification treatment of acidic wastewater was loaded into a 50 ml fixed-bed microreactor, with a loading amount of 10 g. Acidic wastewater with a pH of 3.8 was used as raw material, and the reaction was carried out at 480°C for 1.0 h. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.7. The reaction was continued for 400 hours, and the pH of the product water was 6.2.

[0040] The catalyst used for deacidification of acidic wastewater after reaction was regenerated by calcining at 550℃ for 6 hours, then reloaded into the reactor and subjected to a reaction at 480℃ for 1.0 hour. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.1. The reaction was continued for 600 hours, and the pH of the product water decreased to 6.3. The pH value could be maintained at 6.3 for 1600 hours.

[0041] Example 14: The catalyst for deacidification treatment of acidic wastewater was prepared according to the following steps: S1, take 11.2g of calcium oxide, 6.12g of aluminum oxide, 1.07g of iron oxide, 12.93g of sodium hydroxide, and 14.6g of sodium carbonate, mix them evenly in a mortar to obtain the first mixed powder; S2, slowly add 4g of deionized water dropwise to the first mixed powder while stirring. After the addition is complete, knead the powder into a ball and then extrude it into a strip shape to obtain a strip mixture. S3. After drying the strip-shaped mixture at 120°C for 4 hours, it is calcined at 800°C for 4 hours to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0042] The obtained catalyst for deacidification treatment of acidic wastewater was loaded into a 50ml fixed-bed microreactor with a loading amount of 10g. Acidic wastewater with a pH of 3.8 was used as raw material, and the reaction was carried out at 480℃ for 1.0h. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.3. The reaction was continued for 300 hours, and the pH of the product water was 6.5.

[0043] The catalyst used for deacidification of acidic wastewater after reaction was regenerated by calcining at 550℃ for 6 hours, then reloaded into the reactor and subjected to a reaction at 480℃ for 1.0 hour. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH value of the product water was 6.9. The reaction was continued for 300 hours, and the pH value of the product water decreased to 6.3.

[0044] Example 15: The catalyst for deacidification treatment of acidic wastewater was prepared according to the following steps: S1, take 11.2g of calcium oxide, 5.82g of aluminum oxide, 1.56g of iron oxide, 12.93g of sodium hydroxide and 14.6g of sodium carbonate, mix them evenly in a mortar to obtain the first mixed powder; S2, slowly add 4g of deionized water dropwise to the first mixed powder while stirring. After the addition is complete, knead the powder into a ball and then extrude it into a strip shape to obtain a strip mixture. S3. The strip mixture was dried at 120°C for 4 hours and then calcined at 600°C for 4 hours to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0045] The methanol-coupled light hydrocarbon reaction catalyst and the catalyst obtained in Example 15 for the deacidification treatment of acidic wastewater were loaded into a 50 ml fixed-bed microreactor. The former was loaded with 24 g of methanol and the latter with 10 g of raffinate. Methanol and raffinate oil were used as feedstocks, with 36% by mass of deionized water added to the methanol. The reaction was carried out at 480 °C for 1.0 h. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.2. The reaction was continued for 200 hours, and the pH of the product water was 6.2.

[0046] The catalyst used for deacidification of acidic wastewater after reaction was regenerated by calcining at 550℃ for 6 hours, then reloaded into the reactor and subjected to a reaction at 480℃ for 1.0 hour. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.1. The reaction was continued for 200 hours, and the pH of the product water decreased to 6.1.

[0047] Example 16: The catalyst for deacidification treatment of acidic wastewater was prepared according to the following steps: S1, take 11.2g of calcium oxide, 5.16g of zinc oxide, 8.51g of sodium hydroxide and 9.1g of sodium carbonate, mix them evenly in a mortar to obtain the first mixed powder; S2, slowly add 4g of deionized water dropwise to the first mixed powder while stirring. After the addition is complete, knead the powder into a ball and then extrude it into a strip shape to obtain a strip mixture. S3. The strip mixture was dried at 120°C for 4 hours and then calcined at 600°C for 4 hours to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0048] The methanol-coupled light hydrocarbon reaction catalyst and the catalyst obtained in Example 17 for the deacidification treatment of acidic wastewater were loaded into a 50 ml fixed-bed microreactor. The former was loaded at a rate of 24 g, and the latter at a rate of 10 g. Methanol and raffinate oil were used as feedstocks, with 36% by mass of deionized water added to the methanol. The reaction was carried out at 480 °C for 1.0 h. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.1. The reaction was continued for 100 hours, and the pH of the product water was 6.3.

[0049] The catalyst used for deacidification of acidic wastewater after reaction was regenerated by calcining at 550℃ for 6 hours, then reloaded into the reactor and subjected to a reaction at 480℃ for 1.0 hour. -1The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.0. The reaction was continued for 600 hours, and the pH of the product water decreased to 6.2. The pH value could be maintained at 6.2 for 1600 hours.

[0050] Example 17: The catalyst for deacidification treatment of acidic wastewater was prepared according to the following steps: S1, take 10.0g of calcium oxide, 5.1g of sodium hydroxide and 5.7g of sodium carbonate, mix them evenly in a mortar to obtain the first mixed powder; S2, slowly add 3g of deionized water dropwise to the first mixed powder while stirring. After the addition is complete, knead the powder into a ball and then extrude it into a strip shape to obtain a strip mixture. S3. The strip mixture was dried at 120°C for 4 hours and then calcined at 600°C for 4 hours to obtain a catalyst for the deacidification treatment of acidic wastewater.

[0051] The methanol-coupled light hydrocarbon reaction catalyst and the catalyst obtained in Example 17 for the deacidification treatment of acidic wastewater were loaded into a 50 ml fixed-bed microreactor. The former was loaded at a rate of 24 g, and the latter at a rate of 10 g. Methanol and raffinate oil were used as feedstocks, with 36% by mass of deionized water added to the methanol. The reaction was carried out at 480 °C for 1.0 h. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 7.1. The reaction was continued for 100 hours, and the pH of the product water was 6.3.

[0052] The catalyst used for deacidification of acidic wastewater after reaction was regenerated by calcining at 550℃ for 6 hours, then reloaded into the reactor and subjected to a reaction at 480℃ for 1.0 hour. -1 The reaction was carried out under normal pressure. After 12 hours of reaction, the pH of the product water was 6.9. The reaction was continued for 200 hours, and the pH of the product water decreased to 6.1.

[0053] As can be seen, the pH value of the product water after deacidification treatment of acidic wastewater in Examples 11 to 17 of this invention is [value missing]. The catalyst used for deacidification treatment of acidic wastewater after reaction is regenerated by calcination in an air atmosphere. The activity of the regenerated catalyst can be fully restored, realizing the green production of catalyst for deacidification treatment of acidic wastewater, and can increase the pH value of wastewater from 3.8 to above 6.0, meeting the requirements for external water supply from the factory.

[0054] In summary, the present invention obtains a catalyst by drying and calcining a mixture of metal oxide, sodium hydroxide and sodium carbonate. The reaction conditions are safe and mild, and the catalyst is simple and easy to control without the need for carrier activation. The raw material cost is low, and the synthesized catalyst can be used in the deacidification reaction of acidic wastewater. The product activity can remain stable for a long time, and the obtained catalyst can be regenerated by calcining in an air atmosphere. The activity of the regenerated catalyst can be fully restored.

[0055] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A catalyst for the deacidification treatment of acidic wastewater, characterized in that... It is prepared according to the following steps: S1, mix and grind the required amounts of metal oxide, sodium hydroxide and sodium carbonate evenly to obtain the first mixed powder; S2, add the required amount of deionized water to the first mixed powder, stir evenly, knead the powder into a ball and then extrude it into strips to obtain a strip mixture; S3, the strip mixture is dried and then calcined to obtain a catalyst for the deacidification treatment of acidic wastewater.

2. The catalyst for deacidification treatment of acidic wastewater according to claim 1, characterized in that... The metal oxide is one or more of trivalent metal oxides, divalent metal oxides, and modified metal oxides, wherein the trivalent metal oxide is one or more of Al2O3, Fe2O3, Mn2O3, and Ce2O3, the divalent metal oxide is one or more of CaO, MgO, and ZnO, and the modified metal oxide is one or more of Fe2O3, Cr2O3, and Ce2O3.

3. The catalyst for deacidification treatment of acidic wastewater according to claim 2, characterized in that... The metal oxide is a mixture of trivalent metal oxides, divalent metal oxides and modified metal oxides, wherein the molar ratio of trivalent metal oxides, divalent metal oxides and modified metal oxides is 0.1 to 0.5: 1 to 5: 0.1 to 1.

5.

4. The catalyst for deacidification treatment of acidic wastewater according to claim 3, characterized in that... The metal oxide is a mixture of trivalent metal oxides, divalent metal oxides and modified metal oxides, wherein the molar ratio of trivalent metal oxides, divalent metal oxides and modified metal oxides is 0.1 to 0.3: 2 to 4: 0.6 to 1.

0.

5. The catalyst for deacidification treatment of acidic wastewater according to claim 2, characterized in that... The metal oxide is a mixture of trivalent and divalent metal oxides, wherein the molar ratio of trivalent to divalent metal oxides is 2 to 4: 0.1 to 5: 0.6 to 1.

0.

6. The catalyst for deacidification treatment of acidic wastewater according to any one of claims 1 to 5, characterized in that... In step S1, the molar ratio of sodium hydroxide to sodium carbonate is 4 to 7:3 to 6, and the molar ratio of sodium hydroxide to the metal element in the metal oxide is 1.0 to 1.3:

1.

7. The catalyst for deacidification treatment of acidic wastewater according to any one of claims 1 to 6, characterized in that... In step S3, the drying temperature of the strip mixture is 80℃ to 140℃, the drying time is 2h to 6h, the calcination temperature of the strip mixture is 500℃ to 1000℃, and the calcination time is 2h to 10h.

8. The catalyst for deacidification treatment of acidic wastewater according to claim 7, characterized in that... In step S3, the drying temperature of the strip mixture is 100℃ to 120℃, the drying time is 3h to 5h, and the calcination temperature of the strip mixture is 600℃ to 800℃, the calcination time is 3h to 5h.

9. A method for preparing a catalyst for deacidification treatment of acidic wastewater according to any one of claims 2 to 8, characterized in that... Follow these steps: S1, mix and grind the required amounts of metal oxide, sodium hydroxide and sodium carbonate evenly to obtain the first mixed powder; S2, add the required amount of deionized water to the first mixed powder, stir evenly, knead the powder into a ball and then extrude it into strips to obtain a strip mixture; S3, the strip mixture is dried and then calcined to obtain a catalyst for the deacidification treatment of acidic wastewater.

10. The application of a catalyst for deacidification treatment of acidic wastewater according to any one of claims 1 to 8 in the deacidification treatment of acidic wastewater, characterized in that... After the catalyst used for deacidification treatment of acidic wastewater is deactivated by participating in the reaction, it is calcined at 500°C to 800°C in an air atmosphere. After calcination, its activity is restored and it can be recycled.