A green, low-carbon and recyclable biomass filter material

Abstract

The present invention discloses a green, low-carbon and recyclable biomass filter material, belonging to the technical field of water treatment. By mass fraction, the raw materials of the filter material include: 60-90 parts of coal gangue, 5-20 parts of iron tailings, 1-15 parts of fly ash, 1-5 parts of biomass filler, 6-10 parts of pore-forming agent, 2-8 parts of binder, 0.5-2 parts of bulking agent, and 1-4 parts of lubricant. Among them, lightweight and degradable rice husk powder and coconut coir are added as biomass fillers, eggshells are added as pore-forming agents, corn starch is used as a binder, vermiculite tailings are used as bulking agents, and sodium alginate and talcum powder are used as lubricants. The lubricant can reduce the wear and breakage of the filter material during the sintering process and improve the filtration performance of the filter material. The present invention makes full use of solid waste and natural materials to sinter and prepare the filter material, realizes the recycling of waste, and the produced filter material is green and environmentally friendly and has good sewage filtration performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and particularly relates to a green, low-carbon and recyclable biomass filter material. Background Art

[0002] Ceramsite filter material is a common water treatment material. It has a rough surface, is light in weight, has a high porosity, a large specific surface area, and stable chemical properties. Compared with organic fillers, it has the advantages of strong biological adhesion ability, good film-forming performance, easy backwashing, and strong pollution interception ability. Currently, the ceramsite filter materials on the market are basically prepared from raw materials such as shale, clay, and sludge through processes such as crushing, screening, forming, and sintering to obtain granular filtering media. Shale ceramsite requires the exploitation of mineral resources, which has a certain impact on the environment; clay ceramsite has poor compressive strength and is prone to fracture; sludge ceramsite has a small cylinder compressive strength.

[0003] Coal gangue is an industrial solid waste generated during coal mining and washing. It is a dark gray rock associated with coal seams during the coal formation process, has a low carbon content, and is harder than coal. The long-term storage and accumulation of coal gangue occupy a large amount of land. At the same time, coal gangue will form dust after long-term weathering, resulting in an increase in the concentration of dust particles around the storage yard, polluting the local atmospheric environment. The harmful substances present will enter the local water system with rainwater, polluting the water quality environment. Currently, various ways of resource utilization of coal gangue have been proposed, such as preparing calcined kaolin, power generation, ceramic microspheres, fiber materials, and silica aerogel, etc. In order to achieve the high-value utilization of coal gangue and turn waste into treasure, it is necessary to carry out reasonable design according to the component and structural characteristics of coal gangue to produce products with higher added value.

[0004] Coal gangue has a porous structure and can effectively adsorb heavy metal ions in wastewater. Treating liquid waste with solid waste coal gangue can protect the environment and also has good economic application potential. Through processing, coal gangue can form ceramsite with a certain pore structure and specific surface area. Using coal gangue to produce ceramsite filter material can increase the utilization value of coal gangue in ecological restoration fields such as sewage treatment and sewage purification. Summary of the Invention

[0005] The purpose of the present invention is to provide a green, low-carbon and recyclable biomass filter material to realize the recycling of coal gangue.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The present invention provides a green, low-carbon and recyclable biomass filter material, which is characterized in that, by mass parts, the raw materials of the filter material include: 60-90 parts of coal gangue, 5-20 parts of iron tailings, 1-15 parts of fly ash, 1-5 parts of biomass filler, 6-10 parts of pore-forming agent, 2-8 parts of binder, 0.5-2 parts of bulking agent, and 1-4 parts of lubricant;

[0008] The preparation steps of the filter material are as follows:

[0009] Step 1: The coal gangue and iron tailings are coarsely broken and then dried, ground and sieved through a 200-mesh sieve. The sieved coal gangue, iron tailings, fly ash, biomass filler, pore-forming agent and binder are put into a mixer and stirred to obtain a primary mixture;

[0010] Step 2: Water is added to the primary mixture, and after stirring and mixing, the bulking agent is added and stirred to obtain a secondary mixture;

[0011] Step 3: The secondary mixture is put into a granulator for granulation to obtain green pellets;

[0012] Step 4: The lubricant is sprayed on the surface of the green pellets, and after preliminary drying, a lubricating layer is formed. Forming a lubricating layer on the surface of the pellets can reduce the friction force and the wear rate;

[0013] Step 5: The preliminarily dried green pellets are put into a rotary kiln for sintering, and the filter material is obtained after cooling.

[0014] Further, the biomass filler includes rice husk powder and coconut coir, and the mass ratio is 4:1. The particle size of the rice husk powder is 10-100 μm, and the particle size of the coconut coir is 50-200 μm.

[0015] Coal gangue is recycled aggregate with a low carbon content. Rice husk powder is a by-product processed from rice husks. Coconut coir is an organic medium shed during the processing of coconut shell fibers. It has the characteristics of natural degradation and pure natural environmental protection. Both rice husk powder and coconut coir have the characteristics of light weight, high porosity and biodegradability.

[0016] Further, the pore-forming agent is eggshell powder, and the particle size of the eggshell powder is 10-100 μm;

[0017] The binder is corn starch, the protein mass fraction of the corn starch is <1%, and the particle size is 1-100 μm.

[0018] Eggshell powder is a powdery product obtained by grinding waste eggshells. The main component is calcium carbonate, and calcium carbonate will decompose to produce carbon dioxide during high-temperature heating, which has a pore-forming effect.

[0019] The protein content in corn starch affects the stability of its bonding force. When the protein content exceeds 1%, gelation will occur after the starch is mixed with water and stored for too long.

[0020] Furthermore, the bulking agent is expanded vermiculite tailings, and its preparation steps are as follows:

[0021] Crush and grind the vermiculite tailings, sieve them through a 200-mesh sieve, place them in a crucible and put it into a heating furnace, heat it up to 500 °C at a rate of 30 °C / min, keep it warm for half an hour, cool it and then grind and sieve it through a 200-mesh sieve to obtain the expanded vermiculite tailings;

[0022] The mass fraction of magnesium oxide in the vermiculite tailings is 20-25%.

[0023] Vermiculite tailings are waste generated during the mining and processing of vermiculite ore. They belong to hydrous silicate minerals and are a kind of natural minerals, which have the characteristics of high porosity, large specific surface area and low cost. They have a large adsorption capacity, are non-toxic and harmless to the environment and are easy to regenerate. In addition to a large amount of water existing between the structural units in vermiculite, there is also a part of water in the structural unit layer, which exists in the form of structural hydroxyl groups and will be removed during high-temperature heating. Vermiculite has special expansion properties during the sintering and dehydration process, and can form a loose pore structure inside the material to improve the adsorption performance. Due to the high expansion rate of vermiculite tailings, the volume expansion rate can reach 18 times. If directly added to the material, it will cause deformation and cracking due to excessive expansion during heating. First, subject the vermiculite tailings to partial expansion and then add them to the material, which can achieve appropriate expansion and avoid material cracking.

[0024] Furthermore, the lubricant is a composite material of sodium alginate and talcum powder, and the mass ratio of sodium alginate to talcum powder is 1:1-3. The specific preparation steps are as follows:

[0025] Dissolve sodium alginate in water according to a mass fraction of 0.5%, add talcum powder, and ultrasonically mix and stir evenly to form a slightly viscous liquid to obtain the lubricant.

[0026] Furthermore, the M / G ratio in the sodium alginate is 2.5-3.0, and the degree of polymerization of sodium alginate is 100-300;

[0027] The talcum powder is fine talcum powder, and the cumulative percentage content of particles with a particle size less than 20 μm is greater than 85%. The mass fraction of calcium carbonate in the talcum powder is 1-2%.

[0028] Sodium alginate is mainly composed of β-D-mannuronic acid (M unit) and α-L-guluronic acid (G unit) connected by glycosidic bonds. In the molecular structure of sodium alginate, the ratio of M unit to G unit (i.e., M / G ratio) has a significant impact on the properties of sodium alginate. Sodium alginate with a higher M / G ratio has better elasticity and lower brittleness. The viscosity of the sodium alginate solution varies with the molecular weight of sodium alginate. The higher the degree of polymerization of sodium alginate, the larger the molecular weight, and the greater the viscosity exhibited at the same concentration. The solution formed by sodium alginate with a higher degree of polymerization has too high a viscosity, which is not conducive to the uniformity of spraying.

[0029] The calcium carbonate content in talcum powder should not be too high. The calcium ions in calcium carbonate will crosslink with sodium alginate to form a gel, reducing the fluidity of the lubricant. Talcum powder can fill the depressions on the material surface, reduce the surface roughness, thereby reducing the friction between each other, and talcum powder will decompose when the temperature exceeds 800 °C, and its lubricating performance will decrease significantly.

[0030] Ultrasonic mixing can utilize the ultrasonic cavitation effect to rapidly collapse the bubbles in the lubricant, generate huge stress, reduce the particle size in the lubricant, and obtain a uniformly mixed lubricant.

[0031] Further, the mass of water added in the second step is 10-20% of the primary mixture.

[0032] Further, the diameter of the green balls is 2-16 mm.

[0033] Further, the temperature of the preliminary drying is 40-50 °C.

[0034] Further, the rotary kiln includes a preheating zone and a calcination zone. The preheating zone is heated to 800 °C, and the residence time of the green balls in the preheating zone is 1 h. The calcination zone is heated to 1200 °C, and the residence time of the green balls in the calcination zone is 30 min.

[0035] Advantages of the present invention:

[0036] (1) Using solid waste coal gangue, iron tailing filter, and fly ash as the main raw materials, adding lightweight and degradable rice husk powder and coconut coir as biomass fillers, adding eggshells as pore-forming agents, corn starch as a binder, vermiculite tailings as an expanding agent, sodium alginate and talcum powder as lubricants, sintering the filter material by making full use of solid waste and natural materials, realizing the recycling of waste, the produced filter material is green and environmentally friendly, and after the filter material is used, it can be recycled as building aggregate.

[0037] (2) In the preheating zone of the rotary kiln, as the material temperature of the filter media gradually rises, the binding effect of water will gradually weaken with the evaporation of moisture. During the tumbling operation, wear and breakage of the material balls are most likely to occur at this time, generating a large amount of powder, prone to forming large lumps, and even causing kiln blockage in severe cases, affecting production efficiency. Lubricants are prepared by mixing sodium alginate and talcum powder, and after spraying and drying, a lubricating layer is formed on the surface of the raw material balls, which can reduce wear and breakage during the heating-up process in the preheating zone. In the calcination zone, at high temperatures, sodium alginate will be completely carbonized and talcum powder will decompose. At this time, the solid-phase reaction of the material balls begins, the attraction between particles increases, the holding force of the material balls improves, and surface wear and breakage during the sintering process are greatly reduced. The surface roughness of the filter media prepared by this method is relatively small, and the wear rate and breakage rate of the finished filter media are reduced. Detailed implementation manners

[0038] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0039] Example 1

[0040] Prepare expanded vermiculite tailings: Crush and grind vermiculite tailings (with a magnesium oxide mass fraction of 20 - 25%), pass through a 200-mesh sieve, place them in a crucible and put them into a heating furnace, heat up to 500°C at a rate of 30°C / min, keep warm for half an hour, cool and then grind and pass through a 200-mesh sieve to obtain expanded vermiculite tailings.

[0041] Example 2

[0042] Prepare lubricants: Dissolve sodium alginate (with an M / G ratio of 2.5 - 3.0 and a degree of polymerization of 100 - 300) in water at a mass fraction of 0.5%, add talcum powder according to a mass ratio of sodium alginate to talcum powder (with a calcium carbonate mass fraction of 5% - 10% and a cumulative percentage content of particles smaller than 20μm greater than 85%) of 1:1, ultrasonically mix and stir evenly to form a slightly viscous liquid, with an ultrasonic power of 200W, ultrasonic for 4s, interval of 2s, and continuously ultrasonic for 20min to obtain lubricants.

[0043] Example 3

[0044] The difference from Example 2 is that: adjust the mass ratio of sodium alginate to talcum powder in the lubricant to 1:2.

[0045] Example 4

[0046] The difference from Example 2 is that: adjust the mass ratio of sodium alginate to talcum powder in the lubricant to 1:3.

[0047] Example 5

[0048] This example provides a green, low-carbon and recyclable biomass filter material. By mass, the raw materials of the filter material include: 60 parts of coal gangue, 20 parts of iron tailings, 15 parts of fly ash, 0.8 part of rice husk powder (particle size 10 - 100 μm), 0.2 part of coconut coir (particle size 50 - 200 μm), 6 parts of eggshell powder (particle size 10 - 100 μm), 2 parts of corn starch (protein mass fraction < 1%, particle size 1 - 100 μm), 0.5 part of the expanded vermiculite tailings prepared in Example 1, and 1 part of the lubricant prepared in Example 2. The preparation steps of the filter material are as follows:

[0049] Step 1: The coal gangue and iron tailings are coarsely broken and then dried, ground and sieved through a 200-mesh sieve. According to the above ratio, the sieved coal gangue, iron tailings, fly ash, rice husk powder, coconut coir, eggshell powder and corn starch are put into a mixer and stirred to obtain a primary mixture;

[0050] Step 2: Water is added to the primary mixture, and the mass of the added water is 10% of the primary mixture. After stirring and mixing for 30 min, the expanded vermiculite tailings prepared in Example 1 are added, and after stirring for 10 min, a secondary mixture is obtained;

[0051] Step 3: The secondary mixture is put into a granulator for granulation to obtain green balls with a diameter of 2 - 16 mm;

[0052] Step 4: The lubricant is sprayed on the surface of the green balls and preliminarily dried at 40°C for 10 h to form a lubricating layer;

[0053] Step 5: The preliminarily dried green balls are put into a rotary kiln for sintering. The preheating zone of the rotary kiln is set to be heated to 800°C, and the residence time of the green balls in the preheating zone is 1 h. The calcination zone is heated to 1200°C, and the residence time of the green balls in the calcination zone is 30 min. After cooling by a high-efficiency cooler to below 80°C, the filter material is obtained.

[0054] Examples 6 - 7

[0055] The difference from Example 5 is that the raw material ratio is different. The specific ratio details are shown in Table 1, and other steps and conditions are the same as those in Example 3.

[0056]

[0057] Example 8

[0058] The difference from Example 6 is that the mass fraction of the lubricant in the raw materials is increased to 3 parts, and other steps and conditions are the same as those in Example 6.

[0059] Example 9

[0060] The difference from Example 6 is that the mass fraction of the lubricant in the raw materials is increased to 4 parts, and the other steps and conditions are the same as those in Example 6.

[0061] Example 10

[0062] The difference from Example 8 is that the lubricant prepared in Example 3 is used to replace the lubricant prepared in Example 2 in the raw materials, and the other steps and conditions are the same as those in Example 8.

[0063] Example 11

[0064] The difference from Example 8 is that the lubricant prepared in Example 4 is used to replace the lubricant prepared in Example 2 in the raw materials, and the other steps and conditions are the same as those in Example 8.

[0065] Comparative Example 1

[0066] Compared with Example 5, the difference is that vermiculite tailings directly passed through a 200-mesh sieve after being crushed and ground are used in the raw materials of this comparative example without expansion treatment, and the other steps and conditions are the same as those in Example 5.

[0067] Comparative Example 2

[0068] Compared with Example 5, the difference is that in the preparation steps of this comparative example, the expanded vermiculite tailings and other raw materials are synchronously mixed to form a primary mixture. The specific steps are as follows:

[0069] Step 1: The coal gangue and iron tailings are roughly broken and then dried, ground and passed through a 200-mesh sieve. According to the raw material ratio in Example 5, the sieved coal gangue, iron tailings, fly ash, rice husk powder, coconut coir, eggshell powder, corn starch and expanded vermiculite tailings are put into a mixer and stirred to obtain a primary mixture;

[0070] Step 2: Water is added to the primary mixture, and the mass of the added water is 10% of the primary mixture. After stirring and mixing for 40 min, a secondary mixture is obtained;

[0071] Step 3: The secondary mixture is put into a granulator for granulation to obtain green balls with a diameter of 2 - 16 mm;

[0072] Step 4: The lubricant is sprayed on the surface of the green balls and preliminarily dried at 40 °C for 10 h to form a lubricating layer;

[0073] Step 5: The preliminarily dried green balls are put into a rotary kiln for sintering. The preheating zone of the rotary kiln is set to be heated to 800 °C, and the residence time of the green balls in the preheating zone is 1 h. The calcination zone is heated to 1200 °C, and the residence time of the green balls in the calcination zone is 30 min. After being cooled by a high-efficiency cooler to below 80 °C, filter materials are obtained.

[0074] Comparative Example 3

[0075] Compared with Example 5, the difference is that no lubricant is added to the raw materials in this comparative example. By mass fraction, the raw materials for providing the filter media in this comparative example include: 60 parts of coal gangue, 20 parts of iron tailings, 15 parts of fly ash, 0.8 part of rice husk powder (particle size 10 - 100 μm), 0.2 part of coconut coir (particle size 50 - 200 μm), 6 parts of eggshell powder (particle size 10 - 100 μm), 2 parts of corn starch (protein mass fraction < 1%, particle size 1 - 100 μm), and 0.5 part of expanded vermiculite tailings prepared in Example 1.

[0076] The preparation steps of the filter media are as follows:

[0077] Step 1: The coal gangue and iron tailings are roughly broken and then dried, ground and sieved through a 200 - mesh sieve. According to the above ratio, the sieved coal gangue, iron tailings, fly ash, rice husk powder, coconut coir, eggshell powder and corn starch are put into a mixer and stirred to obtain a primary mixture.

[0078] Step 2: Water is added to the primary mixture, and the mass of the added water is 10% of the primary mixture. After stirring and mixing for 30 min, the expanded vermiculite tailings prepared in Example 1 are put in, and after stirring for 10 min, a secondary mixture is obtained.

[0079] Step 3: The secondary mixture is put into a granulator for granulation to obtain green pellets with a diameter of 2 - 16 mm.

[0080] Step 4: The green pellets are put into a rotary kiln for sintering. The pre - heating zone of the rotary kiln is heated to 800 °C, and the residence time of the green pellets in the pre - heating zone is 1 h. The calcination zone is heated to 1200 °C, and the residence time of the green pellets in the calcination zone is 30 min. They are cooled by a high - efficiency cooler to below 80 °C to obtain the filter media.

[0081] The performance tests are carried out on the filter media prepared in Examples 5 - 11 and Comparative Examples 1 - 3, and the results are shown in Table 2.

[0082] The physical property detection of the filter media is carried out with reference to the standard "CJ / T299 - 2008 Artificial Ceramsite Filter Media for Water Treatment".

[0083] The filtration performance detection of the filter media:

[0084] Take 1 t of wastewater from a sewage treatment plant, with a COD concentration of 750 mg / L, a BOD concentration of 635 mg / L, an ammonia nitrogen concentration of 207 mg / L, and a pH of 7. Filter it using a steel filtration tank. Among them, the tank diameter is 2 meters and the height is 3 meters. An inlet water distribution device and an outlet water collection device are arranged in the tank to ensure uniform water flow distribution. Place the filter media in the filter media layer in the tank. The height of the filter media layer is 1 meter. A cobblestone support layer with a particle size of 2 - 4 cm and a thickness of 0.3 meters is arranged at the bottom of the filter media layer, which plays a role in supporting the filter media and preventing the filter media from flowing away. The filtration speed is 8 m / h, and the backwash cycle is 24 hours. Air-water combined backwashing is used. The water backwash intensity is 12 L / s·m², and the air backwash intensity is 15 L / s·m². After filtration treatment by the filter media, detect the COD concentration, BOD concentration, and ammonia nitrogen concentration in the sewage.

[0085]

[0086] As can be seen from Table 1, in Examples 5 - 7, the proportions of various components in the raw materials of the filter media are different. As the proportion of the biomass filler increases, the porosity of the filter media increases, but too much biomass filler will cause the filter media structure to be loose, and the sum of the breakage rate and wear rate increases. Among them, the filter media prepared with the formulation of Example 6 has better comprehensive performance. Based on Example 6, Examples 8 and 9 increase the addition amount of the lubricant. The more the lubricant, the thicker the formed lubricating layer, and the better the protection performance. The sum of the breakage rate and wear rate decreases, but the talcum powder in the lubricant will fill the pores in the filter media, resulting in a slight decrease in the void ratio and specific surface area, and also a slight decrease in the sewage treatment performance. Based on Example 8, Examples 10 and 11 adjust the mass ratio of sodium alginate and talcum powder in the lubricant. In Example 10, the proportion of talcum powder is increased, and its lubricating performance is better. The sum of the breakage rate and wear rate is smaller than that of Example 8. In Example 11, due to excessive talcum powder, the bonding performance of the lubricant decreases, the adhesion decreases, the surface roughness increases, and the lubrication effect becomes worse instead. In Comparative Example 1, the vermiculite tailings are not expanded and added to the mixture. The filter media prepared from it cracks due to excessive expansion, and its breakage rate and wear rate increase significantly, resulting in the sewage passing directly through the crack during filtration, and the filtration performance decreases. In Comparative Example 2, the expanded vermiculite tailings are synchronously mixed with other raw materials to form a primary mixture. Compared with Example 5, the contact time between the expanded vermiculite tailings and water is long, and it will absorb water to fill the interlayer voids and expand again after heating, resulting in an increased cracking probability of the filter media and a corresponding increase in the breakage rate. In Comparative Example 3, when the filter media does not use a lubricant, the breakage caused during the rotary kiln sintering process will greatly affect the sewage treatment performance.

[0087] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0088] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A green, low-carbon, recyclable biomass filter material, characterized in that: The raw materials of the filter material include, by weight: 60-90 parts of coal gangue, 5-20 parts of iron tailings, 1-15 parts of fly ash, 1-5 parts of biomass filler, 6-10 parts of pore former, 2-8 parts of binder, 0.5-2 parts of bulking agent, and 1-4 parts of lubricant; The biomass filler includes rice husk powder and coconut bran, the pore-forming agent is eggshell powder, and the lubricant is a composite material of sodium alginate and talcum powder; The bulking agent is expanded vermiculite tailings, and the preparation steps are as follows: The vermiculite tailings are crushed and ground, passed through a 200-mesh sieve, placed in a crucible and placed in a heating furnace, heated to 500° C. at 30° C. / min, kept warm for half an hour, cooled, ground and passed through a 200-mesh sieve to obtain expanded vermiculite tailings; The preparation steps of the filter material are as follows: Step 1: Coal gangue and iron tailings are roughly crushed and dried, and then ground and sieved through a 200-mesh sieve. The sieved coal gangue, iron tailings, fly ash, biomass filler, pore former and binder are put into a mixer and stirred to obtain a primary mixture; Step 2: Add water to the primary mixture, stir and mix, then add a bulking agent, and stir to obtain a secondary mixture; Step 3: putting the secondary mixed material into a granulator for granulation to obtain raw material balls; Step 4: Spray the lubricant on the surface of the raw material ball and form a lubricating layer after preliminary drying; Step 5: Put the raw material balls after preliminary drying into a rotary kiln for sintering, and obtain filter material after cooling.

2. The green, low-carbon, recyclable biomass filter material according to claim 1, characterized in that: The mass ratio of rice husk powder to coconut bran in the biomass filler is 4:1, the particle size of the rice husk powder is 10-100 μm, and the particle size of the coconut bran is 50-200 μm.

3. The green, low-carbon, recyclable biomass filter material according to claim 1, characterized in that: The particle size of the eggshell powder is 10-100 μm; The binder is corn starch, the protein mass fraction of the corn starch is less than 1%, and the particle size is 1-100 μm.

4. The green, low-carbon, recyclable biomass filter material according to claim 1, characterized in that: The mass fraction of magnesium oxide in the vermiculite tailings is 20-25%.

5. The green, low-carbon, recyclable biomass filter material according to claim 1, characterized in that: The mass ratio of sodium alginate to talc in the lubricant is 1:1-3, and the specific preparation steps are as follows: Sodium alginate was dissolved in water at a mass fraction of 0.5%, talcum powder was added, and the mixture was evenly mixed and stirred by ultrasonic mixing to form a slightly viscous liquid to obtain a lubricant.

6. The green, low-carbon, recyclable biomass filter material according to claim 5, characterized in that: The M / G ratio of the sodium alginate is 2.5-3.0, and the degree of polymerization of the sodium alginate is 100-300; The talcum powder is fine talcum powder, the cumulative percentage of which particles with a particle size of less than 20 μm is greater than 85%, and the mass fraction of calcium carbonate in the talcum powder is 5-10%.

7. The green, low-carbon, recyclable biomass filter material according to claim 1, characterized in that: The mass of water added in step 2 is 10-20% of the primary mixture.

8. The green, low-carbon, recyclable biomass filter material according to claim 1, characterized in that: The diameter of the raw material ball is 2-16 mm.

9. The green, low-carbon, recyclable biomass filter material according to claim 1, characterized in that: The temperature of the preliminary drying is 40-50°C.

10. The green, low-carbon, recyclable biomass filter material according to claim 1, characterized in that: The rotary kiln comprises a preheating zone and a calcining zone. The preheating zone is heated to 800° C., the residence time of raw material balls in the preheating zone is 1 hour, the calcining zone is heated to 1200° C., the residence time of raw material balls in the calcining zone is 30 minutes.

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