Method for preparing cat litter from furfural residues and prepared cat litter

Abstract

The invention relates to the technical field of cat litter production, in particular to a method for preparing cat litter from furfural residues and the prepared cat litter. The method comprises the steps that the furfural residues are activated and carbonized, and furfural residue porous carbon granules are obtained; carrying out acid activation and calcium oxide reaction on the natural bentonite to generate alkaline calcium bentonite; mixing the furfural residues, the furfural residue porous carbon granules, alkaline calcium bentonite and sodium carboxymethyl cellulose; pouring the obtained composite preparation powder into a disc granulator, spraying deionized water to start granulation, and drying to obtain a functional core layer; and uniformly spraying the water-soluble feed liquid to the surface of the functional core layer in the form of atomized liquid, and drying to form a water-soluble film layer on the surface of the functional core layer, thereby obtaining the furfural residue cat litter. Through cooperative use of the furfural residues, the furfural residue porous carbon granules and the alkaline calcium bentonite, the pollution problem caused by accumulation of the furfural residues is solved, and the prepared furfural residue cat litter has good performance in the aspects of water absorption, deodorization and caking strength.

Description

Technical Field

[0001] The invention relates to the technical field of cat litter production, in particular to a method for preparing cat litter from furfural residues and the prepared cat litter. Background Art

[0002] Cat litter is a highly absorbent material used by cats to bury feces and urine. It's typically used with a litter box. A suitable amount of litter is poured into the box, and trained cats will enter it when they need to defecate. Early cat litters primarily consisted of non-clumping materials, such as sawdust, paper pulp pellets, and silica gel. These simulated sand and provided absorbency, making them easy to collect feces. With the continuous advancement of cat litter technology, bentonite cat litter, tofu cat litter, and mixed cat litters have emerged.

[0003] Furfural residue is made from agricultural products such as cellulose and corncobs. After crushing, the raw material furfural is extracted by adding an appropriate amount of dilute sulfuric acid. Under certain pressures and temperatures, several hydrolysis reactions occur, resulting in the extraction of the furfural. This residue is acidic and, if not properly handled (e.g., by random stacking or discharge), the remaining chemicals can seep into the soil or water, disrupting the ecosystem. Therefore, the rational use of furfural residue to produce harmless, high-quality cat litter is an urgent issue. This paper proposes a method for preparing cat litter from furfural residue and the resulting cat litter. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a method for preparing cat litter from furfural residue and the prepared cat litter. By using furfural residue, furfural residue porous carbon pellets and alkaline calcium-based bentonite in combination, not only the pollution problem caused by the accumulation of furfural residue is solved, but also the prepared furfural residue cat litter has good performance in water absorption, deodorization and cohesive strength.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing cat litter from furfural residue, comprising the following steps: (1) performing activation carbonization treatment on furfural residue to obtain furfural residue porous carbon pellets; (2) Activating natural bentonite with inorganic acid and then reacting with calcium oxide to form alkaline calcium-based bentonite; (3) uniformly mixing the furfural residue, the furfural residue porous carbon pellets, the alkaline calcium bentonite and the sodium carboxymethyl cellulose to obtain a composite pre-powder; (4) pouring the composite prepared powder into a disc granulator, spraying deionized water to start granulation, and drying the obtained granules to obtain a functional core layer; (5) The water-soluble liquid is evenly sprayed onto the surface of the functional core layer in the form of an atomized liquid, and after drying, a water-soluble film layer is formed on the surface to obtain furfural residue cat litter.

[0006] Preferably, in step (1), the preparation method of the furfural residue porous carbon pellets is: dispersing furfural residue and potassium carbonate in deionized water and fully drying at 70-75°C; crushing the obtained dried material and placing it in a tubular furnace, introducing CO2, and keeping it warm at 750-850°C for 30-40 minutes; then cooling, rinsing and drying to obtain the furfural residue porous carbon pellets.

[0007] Preferably, the mass ratio of the furfural residue to potassium carbonate is 2:(0.5-1).

[0008] Preferably, in step (2), the preparation method of the alkaline calcium-based bentonite is: placing natural bentonite in a 10-15wt% hydrochloric acid solution, stirring at 80-85°C for 4-5h, filtering, washing and drying to obtain activated bentonite; mixing the activated bentonite, calcium oxide and deionized water from which CO2 has been removed into a slurry, and drying at 60-65°C for 12-14h to obtain the alkaline calcium-based bentonite.

[0009] Preferably, the mass ratio of the activated bentonite to calcium oxide is 2:(1-1.5); the material-liquid ratio of the activated bentonite to the deionized water for removing CO2 is 1:(6-8).

[0010] Preferably, in step (3), the mass ratio of the furfural residue, the furfural residue porous carbon particles and the alkaline calcium-based bentonite is (10-15): (2-4): (5-8); and sodium carboxymethyl cellulose accounts for 0.5-1% of the mass of the furfural residue.

[0011] Preferably, in step (5), the water-soluble liquid is prepared by: dispersing pregelatinized cassava starch in deionized water, uniformly dispersing it at 75-80°C to obtain a starch dispersion; adding sorbitol, bitters and cellulose nanofibrils to the starch dispersion, and stirring uniformly at 50-55°C to obtain a water-soluble liquid.

[0012] Preferably, the mass fraction of the starch dispersion is 2-4%; the added amount of sorbitol is 30-35% of the mass of the starch dispersion; the added amount of cellulose nanofibrils is 0.5-1% of the mass of the starch dispersion; and the added amount of bitter essence is 0.0002% of the mass of the starch dispersion.

[0013] Preferably, in step (5), the particle size of the furfural residue cat litter is 2-3 mm, and the water content is ≤10%.

[0014] The invention also provides a method for preparing cat litter from furfural residue, which comprises a functional core layer and a water-soluble film layer.

[0015] The present invention provides a method for preparing cat litter from furfural residue and the prepared cat litter, which has the following beneficial effects compared with the prior art: The present invention uses natural bentonite as a base material, performs acid activation and calcium oxide reaction, and forms alkaline calcium-based bentonite sheets with calcium hydroxide inserted therein. When mixed with furfural residue, the alkaline calcium-based bentonite absorbs moisture in the furfural residue and neutralizes the acidic furfural residue to make it neutral or weakly alkaline. The prepared cat litter can avoid damaging cat skin. At the same time, the furfural residue is used as a raw material for activation and carbonization treatment, and the obtained furfural residue porous carbon granules have abundant pores and can better absorb the odor released by cat excrement. Thus, the furfural residue is rationally utilized, the pollution pressure brought by the furfural residue to the environment is reduced, and the economic benefits are also improved.

[0016] The present invention carries out acidification treatment on natural bentonite, and the K + , Ca + 、Na + After the exchangeable ions are dissolved and the pores are unblocked, the calcium oxide reaction is then carried out to allow calcium hydroxide to better enter the unblocked pores. The resulting alkaline calcium-based bentonite can better deal with the problem of acid content in furfural residue.

[0017] The present invention carbonizes furfural residue, and the volatile matter therein escapes to form macropores, and then through the activation effect of potassium carbonate and CO2, the obtained furfural residue porous carbon particles are finally provided with abundant micropores, which can better absorb gases such as ammonia and hydrogen sulfide.

[0018] The raw materials used for the water-soluble film layer in the present invention are starch, sorbitol, bitters and cellulose nanofibrils. The overall material is non-irritating, and the use of the film layer can effectively suppress the problem of dust emission. At the same time, a trace amount of bitters can effectively prevent cats from licking cat litter and causing health problems; in addition, the use of cellulose nanofibrils can increase the strength of the water-soluble film in a dry state, preventing the film layer from being easily broken due to cats stepping on or rubbing it. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 This is a schematic structural diagram of furfural residue cat litter of the present invention; Figure 2 This is a microscopic image of the porous carbon pellets of furfural residue in Example 5 of the present invention; Figure 3 It is a furfural slag cat litter product diagram in Example 5 of the present invention. DETAILED DESCRIPTION

[0020] The following examples illustrate the implementation methods of the present application in detail, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0021] Example 1 The preparation method of the water-soluble liquid is: Pregelatinized cassava starch was dispersed in deionized water at 80°C to obtain a 2 wt% starch dispersion. Sorbitol, bitters, and cellulose nanofibrils were added to the starch dispersion and stirred at 55°C to obtain a water-soluble liquid. The sorbitol was added at a concentration of 30% by weight of the starch dispersion; the cellulose nanofibrils were added at a concentration of 1% by weight of the starch dispersion; and bitters were added at a concentration of 0.0002% by weight of the starch dispersion.

[0022] Example 2 The preparation method of the water-soluble liquid is: Pregelatinized cassava starch was dispersed in deionized water at 75°C to obtain a 4 wt% starch dispersion. Sorbitol, bittersweet, and cellulose nanofibrils were added to the starch dispersion and stirred at 50°C to obtain a water-soluble liquid. The sorbitol content was 35% by weight of the starch dispersion, the cellulose nanofibrils 0.5% by weight, and the bittersweet 0.0002% by weight.

[0023] Example 3 A method for preparing cat litter from furfural residue comprises the following steps: (1) performing activation carbonization treatment on furfural residue to obtain furfural residue porous carbon pellets; The preparation method of the above-mentioned furfural residue porous carbon pellets is as follows: furfural residue and potassium carbonate are dispersed in deionized water in a mass ratio of 2:1, and are fully dried at 70°C; the obtained dry material is crushed and placed in a tubular furnace, CO2 is introduced, and the temperature is kept at 850°C for 30 minutes; and then the furfural residue porous carbon pellets are obtained by cooling, rinsing and drying.

[0024] (2) natural bentonite is activated with an inorganic acid and then reacted with calcium oxide to produce alkaline calcium bentonite; the preparation method of the alkaline calcium bentonite is as follows: natural bentonite is placed in a 10wt% hydrochloric acid solution, stirred at 80°C for 5 hours, filtered, washed and dried to obtain activated bentonite; the activated bentonite, calcium oxide and deionized water from which CO2 has been removed are mixed into a slurry, and dried at 65°C for 12 hours to obtain alkaline calcium bentonite. The mass ratio of the activated bentonite to the calcium oxide is 2:1.5; and the material-liquid ratio of the activated bentonite to the deionized water from which CO2 has been removed is 1:6.

[0025] (3) uniformly mixing the furfural residue, the furfural residue porous carbon pellets, the alkaline calcium bentonite and the sodium carboxymethyl cellulose to obtain a composite pre-powder; The mass ratio of the furfural residue, the furfural residue porous carbon particles and the alkaline calcium-based bentonite is 10:2:5; the sodium carboxymethyl cellulose accounts for 0.5% of the mass of the furfural residue.

[0026] (4) pouring the composite prepared powder into a disc granulator, spraying deionized water to start granulation, and drying the obtained granules to obtain a functional core layer; (5) The water-soluble liquid is evenly sprayed onto the surface of the functional core layer in the form of an atomized liquid, and after drying, a water-soluble film layer is formed on the surface to produce furfural residue cat litter having a particle size of 2-3 mm and a water content of ≤10%. The water-soluble liquid used is produced by the method described in Example 1.

[0027] Example 4 A method for preparing cat litter from furfural residue comprises the following steps: (1) performing activation carbonization treatment on furfural residue to obtain furfural residue porous carbon pellets; The preparation method of the above-mentioned furfural residue porous carbon pellets is as follows: furfural residue and potassium carbonate are dispersed in deionized water in a mass ratio of 2:0.5, and are fully dried at 75°C; the obtained dry material is crushed and placed in a tubular furnace, CO2 is introduced, and the temperature is kept at 750°C for 40 minutes; and then the furfural residue porous carbon pellets are obtained by cooling, rinsing and drying.

[0028] (2) natural bentonite is activated with an inorganic acid and then reacted with calcium oxide to produce alkaline calcium bentonite; the preparation method of the alkaline calcium bentonite is as follows: natural bentonite is placed in a 15wt% hydrochloric acid solution, stirred at 85°C for 4 hours, filtered, washed and dried to obtain activated bentonite; the activated bentonite, calcium oxide and deionized water from which CO2 has been removed are mixed into a slurry, and dried at 60°C for 14 hours to obtain alkaline calcium bentonite, wherein the mass ratio of activated bentonite to calcium oxide is 2:1; and the material-liquid ratio of activated bentonite to deionized water from which CO2 has been removed is 1:8.

[0029] (3) uniformly mixing the furfural residue, the furfural residue porous carbon pellets, the alkaline calcium bentonite and the sodium carboxymethyl cellulose to obtain a composite pre-powder; The mass ratio of the furfural residue, the furfural residue porous carbon particles and the alkaline calcium-based bentonite is 15:4:8; the sodium carboxymethyl cellulose accounts for 1% of the mass of the furfural residue.

[0030] (4) pouring the composite prepared powder into a disc granulator, spraying deionized water to start granulation, and drying the obtained granules to obtain a functional core layer; (5) The water-soluble liquid is evenly sprayed onto the surface of the functional core layer in the form of an atomized liquid, and after drying, a water-soluble film layer is formed on the surface to produce furfural residue cat litter having a particle size of 2-3 mm and a water content of ≤10%. The water-soluble liquid used is produced by the method described in Example 2.

[0031] Example 5 A method for preparing cat litter from furfural residue comprises the following steps: (1) The furfural residue is activated and carbonized to obtain the furfural residue porous carbon pellets, the microscopic picture of which is as follows: Figure 2 As shown; The preparation method of the above-mentioned furfural residue porous carbon pellets is as follows: furfural residue and potassium carbonate are dispersed in deionized water in a mass ratio of 2:0.5, and are fully dried at 75°C; the obtained dry material is crushed and placed in a tubular furnace, CO2 is introduced, and the temperature is kept at 800°C for 36 minutes; and then the furfural residue porous carbon pellets are obtained by cooling, rinsing and drying.

[0032] (2) natural bentonite is activated with an inorganic acid and then reacted with calcium oxide to produce alkaline calcium bentonite; the preparation method of the alkaline calcium bentonite is as follows: natural bentonite is placed in a 12 wt% hydrochloric acid solution, stirred at 80°C for 5 hours, filtered, washed and dried to obtain activated bentonite; the activated bentonite, calcium oxide and deionized water from which CO2 has been removed are mixed into a slurry, and dried at 65°C for 13 hours to obtain alkaline calcium bentonite. The mass ratio of the activated bentonite to the calcium oxide is 2:1; the material-liquid ratio of the activated bentonite to the deionized water from which CO2 has been removed is 1:7.

[0033] (3) uniformly mixing the furfural residue, the furfural residue porous carbon pellets, the alkaline calcium bentonite and the sodium carboxymethyl cellulose to obtain a composite pre-powder; The mass ratio of the furfural residue, the furfural residue porous carbon particles and the alkaline calcium-based bentonite is 12:3:5; the sodium carboxymethyl cellulose accounts for 1% of the mass of the furfural residue.

[0034] (4) pouring the composite prepared powder into a disc granulator, spraying deionized water to start granulation, and drying the obtained granules to obtain a functional core layer; (5) The water-soluble liquid is evenly sprayed onto the surface of the functional core layer in the form of an atomized liquid, and after drying, a water-soluble film layer is formed on the surface to obtain furfural residue cat litter, such as Figure 3 As shown, the particle size is 2-3 mm and the water content is ≤10%. The water-soluble liquid used is prepared by the method in Example 1.

[0035] Comparative Example 1 A method for preparing cat litter from furfural residue is substantially the same as that of Example 5, except that the water-soluble liquid in this comparative example is prepared by: dispersing pregelatinized cassava starch in deionized water and uniformly dispersing at 80°C to obtain a 2 wt% starch dispersion; adding sorbitol and bitters to the starch dispersion and stirring uniformly at 55°C to obtain a water-soluble liquid. The sorbitol is added in an amount of 30% by weight of the starch dispersion; and the bitters are added in an amount of 0.0002% by weight of the starch dispersion.

[0036] Comparative Example 2 A method for preparing cat litter from furfural residue comprises the following steps: (1) Activating natural bentonite with inorganic acid and then reacting with calcium oxide to form alkaline calcium-based bentonite; The alkaline calcium-based bentonite is prepared by placing natural bentonite in a 12wt% hydrochloric acid solution, stirring at 80°C for 5 hours, filtering, washing, and drying to obtain activated bentonite. The activated bentonite, calcium oxide, and deionized water from which CO2 has been removed are mixed into a slurry, and dried at 65°C for 13 hours to obtain the alkaline calcium-based bentonite. The mass ratio of the activated bentonite to calcium oxide is 2:1, and the material-to-liquid ratio of the activated bentonite to deionized water from which CO2 has been removed is 1:7.

[0037] (2) Furfural residue and alkaline calcium bentonite are uniformly mixed in a mass ratio of 12:5, and sodium carboxymethyl cellulose is added in an amount of 1% by mass of the furfural residue to obtain a composite preparatory powder.

[0038] (3) pouring the composite prepared powder into a disc granulator, spraying deionized water to start granulation, and drying the obtained granules to obtain a functional core layer; (4) The water-soluble liquid is evenly sprayed onto the surface of the functional core layer in the form of an atomized liquid, and after drying, a water-soluble film layer is formed on the surface to produce furfural residue cat litter having a particle size of 2-3 mm and a water content of ≤10%. The water-soluble liquid used is produced by the method described in Example 1.

[0039] Comparative Example 3 A method for preparing cat litter from furfural residue comprises the following steps: (1) performing activation carbonization treatment on furfural residue to obtain furfural residue porous carbon pellets; The preparation method of the above-mentioned furfural residue porous carbon pellets is as follows: furfural residue and potassium carbonate are dispersed in deionized water in a mass ratio of 2:0.5, and are fully dried at 75°C; the obtained dry material is crushed and placed in a tubular furnace, CO2 is introduced, and the temperature is kept at 800°C for 36 minutes; and then the furfural residue porous carbon pellets are obtained by cooling, rinsing and drying.

[0040] (2) subjecting natural bentonite to an inorganic acid activation treatment to obtain activated bentonite; The preparation method of the activated bentonite is as follows: natural bentonite is placed in a 12 wt% hydrochloric acid solution, stirred at 80° C. for 5 h, filtered, washed and dried to obtain the activated bentonite.

[0041] (3) uniformly mixing furfural residue, furfural residue porous carbon pellets, activated bentonite and sodium carboxymethyl cellulose to obtain a composite pre-powder; The mass ratio of the furfural residue, the furfural residue porous carbon particles and the activated bentonite is 12:3:5; the sodium carboxymethyl cellulose accounts for 1% of the mass of the furfural residue.

[0042] (4) pouring the composite prepared powder into a disc granulator, spraying deionized water to start granulation, and drying the obtained granules to obtain a functional core layer; (5) The water-soluble liquid is evenly sprayed onto the surface of the functional core layer in the form of an atomized liquid, and after drying, a water-soluble film layer is formed on the surface to produce furfural residue cat litter having a particle size of 2-3 mm and a water content of ≤10%. The water-soluble liquid used is produced by the method described in Example 1.

[0043] Quality Inspection 1. The furfural residue cat litters in Examples 3-5 and Comparative Examples 1-3, and the functional core layer in Example 5 were used as test samples.

[0044] ① Water absorption test: Take a porcelain plate and a 200-mesh standard sieve, place the porcelain plate on a horizontal test bench, put the 200-mesh standard sieve into the porcelain plate, and place a slow qualitative filter paper on the 200-mesh standard sieve; then pour water into the porcelain plate, and stop pouring water when the water surface just completely wets the filter paper in the 200-mesh standard sieve; then take out the wetted filter paper and weigh it, record the weight of the wetted filter paper, and record it as M1; then put the weighed filter paper back into the 200-mesh sieve and flatten it, use a graduated cylinder to measure 10mL of cat litter and pour it on the surface of the filter paper, flatten it but do not exceed the range of the filter paper, start timing, and keep it for 15 minutes; finally, take out the filter paper and the cat litter after water absorption and weigh them together, get the weight at this time, record it as M2, and calculate the water absorption of the cat litter according to the following formula:

[0045] ②Dust test: Take a cat litter sample and weigh it as W1; use a vibrating screen with a mesh size of 0.2mm×0.2mm to sieve at a frequency of 80 times / min for 15min and 30min respectively. The sieved sample is weighed and recorded as W2. The loss rate is calculated as follows:

[0046] The specific test results are shown in Table 1.

[0047] Table 1 Water absorption rate and loss rate

[0048] From Table 1 we can see that: (1) Compared with Example 5, the loss rate of furfural slag cat litter in Comparative Example 1 is not much different when screening for 15 min, but when screening for 30 min, the loss rate is significantly increased, which should be caused by the insufficient strength of the water-soluble film layer on its surface. (2) Compared with Example 5, the furfural residue cat litter in Comparative Example 3 did not use alkaline calcium-based bentonite, resulting in a significant decrease in its water absorption rate; (3) Compared with Example 5, the loss rate of the functional core layer is larger. This is because its surface is not covered with a water-soluble film layer, resulting in more dust leakage.

[0049] 2. The furfural residue cat litter in Examples 3-5 and Comparative Examples 1-3 was used as the test sample.

[0050] ① Cohesion strength test: Place the cat litter in a container with a depth greater than 20 cm, take 20 ml of deionized water at about 38°C, and drip it into the cat litter within 5 seconds. After 1 minute, take out the clumped cat litter and weigh it as G1. Then let the clumped cat litter fall freely from a height of 50 cm, collect the broken cat litter, weigh it and record it as G2. The collapse rate is used to represent the cohesion strength. The collapse rate calculation formula is:

[0051] ② Deodorization test: refer to the QB / T2761-2024 standard for testing, take 500g cat litter (pre-sprayed with water mist at about 38℃ to make it semi-humid) and put it into 1.5m 3 The ammonia purification effect test was carried out in the test chamber. After 24 hours of static adsorption and decomposition, the ammonia removal rate was calculated based on the change in ammonia concentration before and after the test chamber. The test was carried out in accordance with the standard of QB / T2761-2024. 500g of the above cat litter (pre-sprayed with water mist at about 38℃ to make it semi-humid) was placed in a 1.5m 3 The hydrogen sulfide purification effect was tested in a test chamber. After 24 hours of static adsorption and decomposition, the hydrogen sulfide removal rate was calculated based on the change in hydrogen sulfide concentration before and after the test chamber. Removal rate = (pre-treatment concentration - post-treatment concentration) / pre-treatment concentration × 100%.

[0052] The specific test results are shown in Table 2.

[0053] Table 2 Collapse rate and clearance rate category Crash rate, % Ammonia removal rate, % Hydrogen sulfide removal rate, % Example 3 3.4 91.6 91.3 Example 4 3.6 91.4 91.1 Example 5 3.3 92.2 91.7 Comparative Example 1 3.7 92.1 91.9 Comparative Example 2 3.5 82.4 82.5 Comparative Example 3 3.9 87.6 87.2

[0054] As can be seen from the above table, compared with Example 5, the furfural residue cat litter in Comparative Example 2 did not add furfural residue porous carbon pellets, and the furfural residue cat litter in Comparative Example 3 did not use alkaline calcium-based bentonite. Both performed significantly worse in odor removal than the furfural residue cat litter in Example 5.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing cat litter from furfural residue, characterized in that, The following steps are involved: (1) performing activation carbonization treatment on furfural residue to obtain furfural residue porous carbon pellets; (2) Activating natural bentonite with inorganic acid and then reacting with calcium oxide to form alkaline calcium-based bentonite; (3) uniformly mixing the furfural residue, the furfural residue porous carbon pellets, the alkaline calcium bentonite and the sodium carboxymethyl cellulose to obtain a composite pre-powder; (4) pouring the composite prepared powder into a disc granulator, spraying deionized water to start granulation, and drying the obtained granules to obtain a functional core layer; (5) The water-soluble liquid is evenly sprayed onto the surface of the functional core layer in the form of an atomized liquid, and after drying, a water-soluble film layer is formed on the surface to obtain furfural residue cat litter.

2. the method for furfural residue preparing cat litter according to claim 1, is characterized in that, In step (1), the preparation method of the furfural residue porous carbon granules is as follows: dispersing furfural residue and potassium carbonate in deionized water and fully drying at 70-75°C; crushing the obtained dried material and placing it in a tubular furnace, introducing CO2, and keeping it warm at 750-850°C for 30-40 minutes; and then cooling, rinsing and drying to obtain the furfural residue porous carbon granules.

3. the method for furfural residue preparing cat litter according to claim 2 is characterized in that, The mass ratio of the furfural residue to potassium carbonate is 2:(0.5-1).

4. the method for furfural residue preparing cat litter according to claim 1, is characterized in that, In step (2), the preparation method of the alkaline calcium-based bentonite is as follows: natural bentonite is placed in a 10-15wt% hydrochloric acid solution, stirred at 80-85°C for 4-5h, filtered, washed and dried to obtain activated bentonite; the activated bentonite, calcium oxide and deionized water from which CO2 has been removed are mixed into a slurry, and dried at 60-65°C for 12-14h to obtain the alkaline calcium-based bentonite.

5. the method for furfural residue preparing cat litter according to claim 4 is characterized in that, The mass ratio of the activated bentonite to calcium oxide is 2:(1-1.5); the material-liquid ratio of the activated bentonite to deionized water for removing CO2 is 1:(6-8).

6. the method for furfural residue preparing cat litter according to claim 1 is characterized in that, In step (3), the mass ratio of the furfural residue, the furfural residue porous carbon particles and the alkaline calcium-based bentonite is (10-15): (2-4): (5-8); and the sodium carboxymethyl cellulose accounts for 0.5-1% of the mass of the furfural residue.

7. The method for preparing cat litter from furfural residue according to claim 1, wherein In step (5), the water-soluble liquid is prepared by: dispersing pregelatinized cassava starch in deionized water, uniformly dispersing it at 75-80° C. to obtain a starch dispersion; adding sorbitol, bitter essence and cellulose nanofibrils to the starch dispersion, and stirring uniformly at 50-55° C. to obtain a water-soluble liquid.

8. The method for preparing cat litter from furfural residue according to claim 7, wherein The mass fraction of the starch dispersion is 2-4%; the added amount of sorbitol is 30-35% of the mass of the starch dispersion; the added amount of cellulose nanofibrils is 0.5-1% of the mass of the starch dispersion; and the added amount of bitter essence is 0.0002% of the mass of the starch dispersion.

9. the method for preparing cat litter from furfural residue according to claim 1, is characterized in that, In step (5), the particle size of the furfural residue cat litter is 2-3 mm, and the water content is ≤10%.

10. The furfural slag cat litter prepared by the method for preparing cat litter from furfural slag according to any one of claims 1 to 9, wherein It includes a functional core layer and a water-soluble film layer.

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