A method for preparing calcium-based adsorption material from carbide slag

Abstract

The present invention discloses a method for preparing a calcium-based adsorption material. Calcium-containing carbide slag, asphalt, and biomass are fully mixed in a certain proportion and then subjected to high-temperature treatment. After the mixture is cooled naturally, an adsorption material is obtained. Specifically, fine carbide slag particles are added to molten asphalt and stirred evenly, then quickly cooled, crushed, and sieved. The mixed particles are then evenly mixed with biomass particles and placed in a crucible for programmed heating. After the heating is completed, the mixture is taken out and cooled naturally to obtain a calcium-based adsorption material. This adsorption material does not require additional activation to exhibit good adsorption performance, especially for heavy metal elements in water and carbon dioxide in flue gas. After adsorbing carbon dioxide in flue gas, the adsorption material can continue to adsorb heavy metal ions in water, and after adsorbing carbon dioxide in flue gas, the adsorption capacity of the adsorption material for heavy metal ions will be significantly improved.

Description

Technical Field

[0001] The invention belongs to the field of adsorption material preparation, and particularly relates to a method for preparing calcium-based adsorption material from carbide slag. Background Art

[0002] Excessive carbon dioxide emissions are a major factor contributing to the greenhouse effect. In 2021, global petrochemical carbon emissions reached 36.4 billion tons. Excessive CO2 emissions have caused irreversible impacts on the global environment. If uncontrolled, climate problems caused by high CO2 concentrations will enter a vicious cycle. Carbon dioxide capture, utilization, and storage (CO2) technology is currently a key technology that can both reduce carbon emissions in key areas and lower existing CO2 concentrations. In 2020, human-captured CO2 accounted for only 0.1% of total CO2 emissions. CO2 capture, utilization, and storage technology has significant potential for development and is a key breakthrough in alleviating the growing problem of global warming. In addition to air pollution, water pollution is another major environmental issue we face. Heavy metal ions are a major cause of water pollution. Industrial processes such as mining, petroleum, metallurgy, and papermaking generate large amounts of wastewater contaminated by heavy metal ions. Common heavy metal elements in industrial wastewater include lead, copper, mercury, and chromium.

[0003] At present, the main methods for capturing carbon dioxide include absorption, membrane separation and solid adsorption. Chemical absorption and membrane separation are relatively expensive, and the chemical absorption method may produce other wastes, so it is difficult to apply on a large scale. The solid adsorption method is relatively low in cost and has the potential for large-scale use. At present, most calcium-based carbon dioxide adsorption materials have the problem of low adsorption capacity, and are difficult to continue to use after adsorption. The present invention can effectively solve these problems. The calcium-based adsorption material involved in the present invention has a higher adsorption capacity for carbon dioxide than most existing calcium-based carbon dioxide adsorption materials, and after adsorbing carbon dioxide, it also has a good adsorption effect on heavy metal ions.

[0004] Adsorption is an effective method for treating heavy metal wastewater, with significant treatment effects. Carbon-based materials such as activated carbon and biochar, as well as mineral-containing adsorption materials such as calcium carbonate and calcium oxide, all have a certain adsorption effect on metal ions. Calcium carbonate can also act as a sedimentation agent to remove suspended particles in wastewater. The calcium-based adsorption material described in the present invention, after adsorbing carbon dioxide, is converted into a porous material whose main components are carbon, calcium carbonate, and calcium oxide, and has a good adsorption effect on heavy metals in wastewater. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preparing calcium-based adsorption material from carbide slag. The present invention not only effectively utilizes the carbide slag, but also provides a method for preparing a calcium-based adsorption material with good adsorption performance and good stability, and studies its properties and generation mechanism.

[0006] The principle of the present invention is as follows: carbide slag is primarily composed of calcium hydroxide, which decomposes at high temperatures to produce calcium oxide and water vapor. Calcium oxide has a strong adsorption effect on carbon dioxide. Calcium oxide and carbon dioxide react with water to form calcium carbonate, which both have a strong adsorption effect on heavy metal ions. Biomass, a readily available renewable energy source rich in organic matter, undergoes pyrolysis at high temperatures to produce a porous carbon structure. Furthermore, biomass is rich in potassium ions and other alkali and alkaline earth metal elements, which activate the adsorbent material. This allows the calcium-based adsorbent prepared by this method to exhibit excellent adsorption of carbon dioxide without requiring further activation. Asphalt is an organic gelling material with strong inherent adhesive properties. Asphalt is primarily composed of various organic compounds, and during pyrolysis, it produces colloids that bind the material together and improve its mechanical properties. Furthermore, asphalt is amorphous and generally softens upon heating to a certain temperature. The higher the temperature, the less viscous it becomes. When the temperature reaches a certain level, carbide slag readily and evenly distributes within it, resulting in an adsorbent material with a high specific surface area and uniform distribution of active sites.

[0007] The present invention provides a preparation method of a calcium-based adsorption material. First, carbide slag and asphalt are mixed and formed into particles. Then, the particles are mixed with biomass particles. The mixture is heated to 400-480°C at a heating rate of 0.5-5°C / min and kept at a constant temperature for 20-60 min. Then, the mixture is heated to 600-850°C at a heating rate of 1-10°C / min and kept at a constant temperature for 30-120 min. Finally, the mixture is allowed to cool naturally.

[0008] Specifically, the steps of the preparation method of a calcium-based adsorption material provided by the present invention are as follows:

[0009] (1) Air, crush, screen and dry the carbide slag. The particle size of the carbide slag should be between 0.01-0.03 mm.

[0010] (2) Heat the asphalt to soften it until it completely becomes liquid. The higher the temperature of the asphalt, the lower its viscosity. Generally, it needs to be heated to above 150°C (this temperature may vary depending on the composition of the asphalt).

[0011] (3) The carbide slag particles obtained in step (1) are mixed into the asphalt solution and stirred thoroughly to ensure that the carbide slag particles are evenly distributed in the asphalt. Generally, stirring is required at a speed of 70 r / min or above for more than one hour (this may vary depending on the viscosity of the asphalt).

[0012] (4) The asphalt liquid mixed with carbide slag particles obtained in step (3) is rapidly cooled to below 20°C, crushed, air-dried, and sieved. The particle size of the mixed particles should be between 0.075 and 0.2 mm.

[0013] (5) The biomass is dried, crushed, and sieved for later use. The potassium content of the biomass is above 1500 μg / g. The biomass is cotton stalks, algae, elm bark, or rice straw. Due to the large difference in density between biomass and asphalt, to ensure the mixing effect after stirring, the biomass particle size should be 0.2-1 times that of the asphalt particle size.

[0014] (6) Thoroughly mix the asphalt particles in step (4) with the biomass in step (1).

[0015] (7) The mixed particles in step (6) are placed in a crucible for high temperature treatment. First, the temperature is increased to 300-480°C at a heating rate of 0.5-5°C / min and maintained at this temperature for 20-60 min. Then, the temperature is increased to 600-850°C at a heating rate of 1-10°C / min and maintained at this temperature for 30-120 min.

[0016] (8) The solid particles after the reaction are allowed to cool naturally to obtain a calcium-based carbon skeleton adsorption material.

[0017] Preferably, the particle size of carbide slag should be between 0.01 mm and 0.03 mm.

[0018] Preferably, the potassium content of the biomass is between 3000-8000 μg / g.

[0019] Preferably, the mass ratio of carbide slag particles to biomass particles is between 1:1 and 1:5.

[0020] Preferably, the mass ratio of carbide slag to asphalt in the mixed particles is between 2:1 and 1:2.

[0021] Preferably, the carbide slag accounts for between 20% and 30% of the total mass, and the potassium element contained in the biomass in the mixed particles accounts for between 0.5% and 5% of the total mass.

[0022] Preferably, the programmed temperature rise process should first be to 350-450°C at a heating rate of 1-3°C / min and held at that temperature for 30-45 min, then to 650-800°C at a heating rate of 3-5°C / min and held at that temperature for 50-100 min.

[0023] The reaction mechanism for preparing the calcium-based adsorbent material using carbide slag in the present invention is as follows: At temperatures below 500°C, biomass and asphalt undergo pyrolysis. The pyrolysis of the asphalt produces colloids that bind the material particles together, forming a preliminary carbon skeleton. Since the calcium in the carbide slag primarily exists as calcium hydroxide, it is evenly distributed within the carbon skeleton as the asphalt melts and pyrolyzes. At temperatures between 500°C and 600°C, the calcium hydroxide begins to decompose, producing water vapor and calcium oxide. Once the temperature rises above 600°C, the calcium hydroxide rapidly decomposes to produce water vapor and calcium oxide. At this point, the calcium element within the carbon support primarily exists as calcium oxide particles and calcium ions. Calcium oxide crystals contain defects such as oxygen and calcium vacancies, which serve as active sites to enhance the adsorption performance of the adsorbent material. High-temperature treatment can increase the number of these active sites and ensure a more uniform distribution across the carbon support surface. The calcium ions in the calcium oxide form chemical bonds with functional groups in the carbon skeleton, securing the calcium ions. Some functional groups in the carbon skeleton can also adsorb certain polar molecules.

[0024] Beneficial effects of the present invention:

[0025] (1) Carbide slag is difficult to utilize under existing technical conditions. The present invention can effectively utilize carbide slag.

[0026] (2) The present invention provides a method for preparing a calcium-based carbon skeleton adsorption material. The adsorption material can play a role in multiple aspects, for example: adsorbing heavy metals such as lead, chromium, mercury, etc. in water, which can purify water quality; the material also has a good adsorption effect on carbon dioxide in flue gas, which has a good effect on reducing carbon emissions; after absorbing carbon dioxide in flue gas, the material can still absorb heavy metal ions in water well; the material can show excellent adsorption performance without the need for activation. DETAILED DESCRIPTION

[0027] In order to better describe the content and advantages of the present invention, the present invention is described in detail below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] Example 1

[0030] This embodiment uses carbide slag, cotton stalks, and coal tar pitch as raw materials for experiments.

[0031] (1) Pretreatment: Place carbide slag and cotton stalks in a dry, ventilated place away from direct sunlight at room temperature and dry them for later use. After drying, crush them into particles with a particle size of less than 0.015 mm. Heat the coal tar pitch to 210 °C. Add the carbide slag particles to the coal tar pitch and stir at 80 r / min for 120 min. After stirring, cool it to below 20 °C and continue stirring slowly until it cools to 70 °C. Crush the cooled pitch into particles with a particle size of 0.18-0.25 mm for later use, and crush the cotton stalks into particles with a particle size of 0.1-0.15 mm for later use. The mixture contains 1 g of carbide slag, 5 g of cotton stalks, and 9 g of pitch.

[0032] (2) High temperature treatment: The cotton stalk particles and the mixed particles were fully mixed and placed in a muffle furnace for high temperature treatment. The temperature was raised to 420 °C at a heating rate of 1 °C / min and kept constant for 30 min. Then, the temperature was raised to 700 °C at a heating rate of 5 °C / min and kept constant for 60 min.

[0033] (3) The product obtained in (2) is cooled to room temperature to obtain a calcium-based carbon skeleton adsorption material. Subsequent experiments have shown that it has a good adsorption effect on carbon dioxide, and the adsorption effect can reach more than 90%. When its adsorption effect on carbon dioxide is significantly reduced, the material is used to conduct an adsorption experiment on heavy metal ions in water, and it is found that its adsorption capacity for heavy metals can be increased by more than 20% compared with its adsorption capacity for heavy metals before adsorbing carbon dioxide. When it basically loses its adsorption effect on carbon dioxide, the material is used to conduct an adsorption experiment on heavy metal ions in water, and it is found that its adsorption capacity for heavy metals can be increased by more than 30% compared with its adsorption capacity for heavy metals before adsorbing carbon dioxide.

[0034] Example 2

[0035] In this embodiment, experiments were conducted using carbide slag and coal tar pitch as raw materials.

[0036] (1) Pretreatment: Place carbide slag in a dry, ventilated place away from direct sunlight at room temperature to dry for later use. After drying, crush it into particles with a particle size of less than 0.015 mm. Heat coal tar pitch to 210 °C. Add carbide slag particles to coal tar pitch and stir at 80 r / min for 120 min. After stirring, cool it to below 20 °C and continue stirring slowly until it cools to 70 °C. Crush the cooled pitch into particles with a particle size of 0.18-0.25 mm for later use, with 5 g of carbide slag and 10 g of pitch.

[0037] (2) High-temperature treatment: The mixed particles of asphalt and carbide slag were placed in a muffle furnace for high-temperature treatment. The temperature was raised to 420 °C at a heating rate of 1 °C / min and kept constant for 30 min. Then the temperature was raised to 700 °C at a heating rate of 5 °C / min and kept constant for 60 min.

[0038] (3) The product obtained in (2) is cooled to room temperature to obtain a calcium-based carbon skeleton adsorption material. Subsequent experiments have shown that it has a certain good adsorption effect on carbon dioxide, and its adsorption efficiency is about 50% of the adsorption material in Example 1. After activation by potassium ions, its carbon dioxide adsorption efficiency is about 90% of the adsorption material in Example 1. When its carbon dioxide adsorption effect is significantly reduced, the material is used to conduct an adsorption experiment on heavy metal ions in water, and it is found that its adsorption capacity for heavy metals can be increased by about 10% compared with its adsorption capacity for heavy metals before adsorbing carbon dioxide. When it basically loses its adsorption effect on carbon dioxide, the material is used to conduct an adsorption experiment on heavy metal ions in water, and it is found that its adsorption capacity for heavy metals can be increased by about 20% compared with its adsorption capacity for heavy metals before adsorbing carbon dioxide.

[0039] Example 3

[0040] This embodiment is experimented with carbide slag and cotton stalks as raw materials.

[0041] (1) Pretreatment: Place carbide slag and cotton stalks in a dry, ventilated place at room temperature, away from direct sunlight, and dry them for later use. Grind the dried carbide slag into particles with a size of 0.18-0.25 mm for later use, and grind the cotton stalks into particles with a size of 0.1-0.15 mm for later use. 5 g of carbide slag and 10 g of cotton stalks are used.

[0042] (2) High temperature treatment: The cotton stalk particles and carbide slag particles were fully mixed and placed in a muffle furnace for high temperature treatment. The temperature was raised to 420 °C at a heating rate of 1 °C / min and kept constant at this temperature for 30 min. Then, the temperature was raised to 700 °C at a heating rate of 5 °C / min and kept constant at this temperature for 60 min.

[0043] (3) The product obtained in (2) was cooled to room temperature to obtain a calcium-based carbon skeleton adsorption material. The material was in the form of black particles with a low specific surface area. The active ingredient calcium oxide particles were unevenly distributed and had fallen off the material. Subsequent experiments showed that it had a certain adsorption effect on carbon dioxide, and its adsorption efficiency was about 30% of that of the adsorption material in Example 1. During the adsorption of carbon dioxide, a large amount of calcium oxide particles fell off.

[0044] Example 4

[0045] In this embodiment, cotton stalks and coal tar pitch were used as raw materials for the experiment.

[0046] (1) Pretreatment: Place the cotton stalks in a dry, ventilated place at room temperature and out of direct sunlight to dry before use. Heat the coal tar pitch to 210°C and stir the heated pitch at 80 rpm for 120 min. After stirring, cool it to below 20°C and continue stirring slowly until it cools to 70°C. Crush the cooled pitch into particles with a particle size of 0.18-0.25 mm and crush the cotton stalks into particles with a particle size of 0.1-0.15 mm. The mixture contains 5 g of cotton stalks and 10 g of pitch.

[0047] (2) High-temperature treatment: After the asphalt particles and cotton stalk particles are fully mixed, they are placed in a muffle furnace for high-temperature treatment. The temperature is raised to 420 °C at a heating rate of 1 °C / min and kept constant for 30 min. Then, the temperature is raised to 700 °C at a heating rate of 5 °C / min and kept constant for 60 min.

[0048] (3) The product obtained in (2) was cooled to room temperature to obtain a carbon skeleton adsorption material. The mechanical properties of this material were similar to those of the adsorption material obtained in Example 1. Subsequent experiments showed that it had a certain adsorption effect on carbon dioxide, and its adsorption efficiency was about 20% of the adsorption efficiency of the adsorption material in Example 1. After activation with potassium ions, its carbon dioxide adsorption efficiency did not change significantly. When its carbon dioxide adsorption effect was significantly reduced, the material was used to conduct an adsorption experiment on heavy metal ions in water. It was found that its adsorption capacity for heavy metals was reduced compared to its adsorption capacity for heavy metals before carbon dioxide adsorption.

[0049] Example 5

[0050] This embodiment uses carbide slag, cotton stalks, and coal tar pitch as raw materials for experiments.

[0051] (1) Pretreatment: Place carbide slag and cotton stalks in a dry, ventilated place away from direct sunlight at room temperature and dry them for later use. After drying, crush the carbide slag into particles with a particle size of less than 0.05 mm. Heat the coal tar pitch to 210 °C. Add the carbide slag particles to the coal tar pitch and stir at 80 r / min for 120 min. After stirring, cool it to below 20 °C and continue stirring slowly before cooling to 70 °C. Crush the cooled pitch into particles with a particle size of 0.18-0.25 mm for later use, and crush the cotton stalks into particles with a particle size of 0.1-0.15 mm for later use. The amount of carbide slag is 1 g, the amount of cotton stalks is 5 g, and the amount of pitch is 9 g.

[0052] (2) High temperature treatment: The cotton stalk particles and the mixed particles were fully mixed and placed in a muffle furnace for high temperature treatment. The temperature was raised to 420 °C at a heating rate of 1 °C / min and kept constant for 30 min. Then, the temperature was raised to 700 °C at a heating rate of 5 °C / min and kept constant for 60 min.

[0053] (3) The product obtained in (2) is cooled to room temperature to obtain a calcium-based carbon skeleton adsorption material. Obvious small white spots can be observed on the surface of some material particles. Subsequent experiments have shown that it has a good adsorption effect on carbon dioxide, and the adsorption effect can reach more than 80%. The calcium-based carbon skeleton adsorption material is directly used to conduct a short-term adsorption experiment on heavy metal ions in water. It is found that its adsorption capacity for heavy metal ions is only 50% of the material in Example 1. When its adsorption effect on carbon dioxide is significantly reduced, the material is used to conduct a short-term adsorption experiment on heavy metal ions in water. It is found that its adsorption capacity for heavy metals can be increased by more than 10% compared with its adsorption capacity for heavy metals before adsorbing carbon dioxide. When it basically loses its adsorption effect on carbon dioxide, the material is used to conduct an adsorption experiment on heavy metal ions in water. It is found that its adsorption capacity for heavy metals can be increased by more than 15% compared with its adsorption capacity for heavy metals before adsorbing carbon dioxide. However, during the experiment, we found that its adsorption rate was slow. When this material was placed in wastewater containing heavy metal ions for 3 hours, it was still possible to detect that the concentration of heavy metal ions in the wastewater was slowly decreasing.

[0054] Example 6

[0055] This embodiment uses carbide slag, cotton stalks, and coal tar pitch as raw materials for experiments.

[0056] (1) Pretreatment: Place carbide slag and cotton stalks in a dry, ventilated place at room temperature and out of direct sunlight to dry for later use. After drying, crush the carbide slag into particles with a particle size of less than 0.015 mm. Heat the coal tar pitch to 210 °C. Add the carbide slag particles to the coal tar pitch and stir at 80 r / min for 120 min. After stirring, cool it to below 20 °C and continue stirring slowly before cooling to 70 °C. Crush the cooled pitch into particles with a particle size of 0.18-0.25 mm for later use, and crush the cotton stalks into particles with a particle size of 0.1-0.15 mm for later use. The amount of carbide slag is 1 g, the amount of cotton stalks is 5 g, and the amount of pitch is 9 g.

[0057] (2) High temperature treatment: The cotton stalk particles and the mixed particles were fully mixed and placed in a muffle furnace for high temperature treatment. The temperature was raised to 300 °C at a heating rate of 10 °C / min and kept constant for 60 min. Then the temperature was raised to 700 °C at a heating rate of 1 °C / min and kept constant for 60 min.

[0058] (3) The product obtained in (2) is cooled to room temperature to obtain a calcium-based carbon skeleton adsorption material. During the heating process, the asphalt melts. Since 300°C is not enough to completely decompose the heavy components in the asphalt, the density of the asphalt is much greater than that of the cotton stalk. Therefore, after the asphalt melts, it will be distributed in the lower layer of the container, resulting in an uneven structure of the final product, affecting its specific surface area. Subsequent experiments have shown that it has a certain adsorption effect on carbon dioxide, and the adsorption effect can reach more than 60%. The calcium-based carbon skeleton adsorption material was directly used to conduct a short-term adsorption experiment on heavy metal ions in water. It was found that its adsorption capacity for heavy metal ions was only 30% of the material in Example 1. When its adsorption effect on carbon dioxide was significantly reduced, the material was used to conduct a short-term adsorption experiment on heavy metal ions in water. It was found that its adsorption capacity for heavy metals was increased by more than 30% compared with its adsorption capacity for heavy metals before carbon dioxide adsorption. After the material essentially lost its ability to adsorb carbon dioxide, tests revealed a significant increase in its specific surface area. Adsorption experiments using the material on heavy metal ions in water revealed a 50% increase in its adsorption capacity compared to before carbon dioxide adsorption. However, during the experiments, we discovered that the adsorption rate was slow. Even after placing the material in wastewater containing heavy metal ions for five hours, we could still detect a slow decrease in the concentration of heavy metal ions in the wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a summary diagram of the main data of the embodiment.

[0060] The figure summarizes the main parameters in the catalyst preparation process, such as the particle size and mass of the raw materials, the first-stage heating rate, the first-stage final temperature, the first-stage constant temperature time, the second-stage heating time, the second-stage final temperature, and the second-stage constant temperature time.

Claims

1. A method for preparing calcium-based adsorption material from carbide slag, characterized in that: The following steps are involved: (1) Taking a certain amount of carbide slag and biomass, drying them separately, crushing, screening, and drying them to obtain carbide slag particles and biomass particles of a certain size; (2) Place a certain amount of asphalt in a beaker and heat it to soften it until it completely turns into liquid; (3) mixing the carbide slag particles obtained in step (1) into the asphalt solution and stirring thoroughly until the carbide slag particles are evenly distributed in the asphalt; (4) rapidly cooling the asphalt liquid mixed with carbide slag particles obtained in step (3) to completely solidify it, and then crushing, air-drying, and sieving to obtain mixed particles of a certain particle size; (5) fully mixing the mixed particles obtained in step (4) with the biomass particles in step (1); (6) The particles mixed in step (5) are placed in a crucible for high-temperature treatment. First, the temperature is raised to a certain temperature at a certain heating rate and maintained at a constant temperature for a certain time. The temperature must be lower than the decomposition temperature of calcium hydroxide in carbide slag and greater than the initial pyrolysis temperature of biomass and asphalt. Then, the temperature is raised to a certain temperature at a relatively fast heating rate. The temperature must be higher than the decomposition temperature of calcium hydroxide and maintained at a constant temperature for a certain time to ensure that the calcium hydroxide is completely decomposed. (7) The solid particles after the reaction are allowed to cool naturally to obtain a calcium-based carbon skeleton adsorption material.

2. The method according to claim 1, characterized in that The selection of biomass should meet a certain potassium content, and the potassium content in the biomass is above 1500 μg / g. The biomass is cotton stalks, algae, elm bark or rice straw.

3. The method according to claim 1, characterized in that The particle size of the mixed particles in step (4) should be between 0.075 and 0.2 mm.

4. The method according to claim 1, wherein In step (1), in order to make the carbide slag evenly distributed in the asphalt, the particle size of the carbide slag should be much smaller than the particle size of the mixed particles, so the particle size of the carbide slag should be between 0.01-0.03 mm. Since the density difference between biomass and asphalt is large, in order to ensure the mixing effect after stirring, the particle size of the biomass should be 0.2-1.0 times the particle size of the mixed particles.

5. The method according to claim 1, wherein The programmed heating process in step (7) should comply with the following requirements: first, heat the sample to 400-480 °C at a heating rate of 0.5-5 °C / min and keep the temperature constant for 20-60 min, then heat the sample to 600-850 °C at a heating rate of 1-10 °C / min and keep the temperature constant for 30-120 min.

6. The method according to claim 1, characterized in that include: Utilize carbide slag as waste; utilize organic matter in biomass to supplement carbon; utilize potassium in biomass to activate adsorption materials; The high bonding index of asphalt is used to bond the adsorption material into shape; the amorphous nature of asphalt is used to evenly distribute the carbide slag particles.

7. The method according to claim 1, characterized in that The mass ratio of carbide slag to biomass is between 1:0.5 and 1:10, and the mass ratio of carbide slag to asphalt is between 1:1 and 1:

10.

8. The method according to claim 1, characterized in that Carbide slag particles account for between 5% and 40% of the total mass.

9. The method according to claim 1, characterized in that The biomass in the mixed pellets contains potassium in an amount between 0.2% and 6% of the total mass.

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