Activated carbon-coated sodium-based black talc cat litter and preparation method thereof

Abstract

The present invention discloses an activated carbon-coated sodium-based black talc cat litter and a preparation method thereof. The cat litter comprises black talc and activated carbon, wherein the black talc is sodium-modified black talc. The purpose of doping the sodium-modified black talc is to improve the water absorption capacity of the black talc. When combined with activated carbon to form granules, the talc-based cat litter can effectively deodorize and absorb odors. The black talc-based cat litter provided by the present invention has strong adsorption capacity and excellent deodorizing properties. The raw materials for its preparation are readily available and inexpensive, making it suitable for large-scale factory production at a low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of pet products and relates to pet bedding, in particular to activated carbon-coated sodium-based black talc cat litter and a preparation method thereof. Background Art

[0002] Cat litter is an inorganic adsorbent material used to remove cat excrement and odor, thereby maintaining indoor hygiene. There are many types of cat litter currently available on the market, including bentonite cat litter, tofu cat litter, mixed cat litter, and more. Cat litter made from natural mineral materials best suits cats' natural instincts and is the most popular type of cat litter for cats, also occupying the largest market share. Non-metallic minerals that can be used to make cat litter include sepiolite, bentonite, diatomaceous earth, and attapulgite. In many cases, countries around the world develop this product based on local conditions and resource availability, achieving the goal of reducing costs by making it easier to mine and transport raw materials.

[0003] Bentonite cat litter is currently the most commonly used cat litter. It's primarily composed of bentonite clay and consists of small, white or off-white granules. Other functional ingredients are also added, such as activated carbon to enhance odor absorption and natural plant extracts to enhance fragrance. During use, bentonite cat litter, being highly hygroscopic, quickly absorbs moisture from feces, forming a large, hard mass. However, its inconvenience in flushing and the tendency of the granules to become lodged in a cat's pads can also be inconvenient for owners.

[0004] Tofu cat litter is an environmentally friendly cat litter that has gained popularity in recent years. Its primary raw material is dried soy or pea fiber, which is compounded with starch, water, flavorings, and gums before being granulated, dried, cooled, and packaged. It has good water absorption and clumping properties and can be flushed down the toilet after use. However, its deodorizing ability is average. Furthermore, the use of soy or pea dregs as raw material requires prompt drying, resulting in relatively high raw material costs. Furthermore, because it contains plant-based ingredients, it is prone to mold in humid environments, potentially producing mycotoxins. Mixed cat litter is a mixture of bentonite and tofu litter in a specific ratio. Its advantages and disadvantages are less pronounced. Summary of the Invention

[0005] The present invention provides an activated carbon-coated sodium-based black talc cat litter and a preparation method thereof. The black talc-based cat litter has the functions of deodorization and rapid water absorption and agglomeration. The technical principle of the invention is to granulate the powder obtained by high-temperature calcination of sodium-based black talc powder and activated carbon powder. The activated carbon powder is coated with the activated carbon powder because its porous structure can effectively absorb odors, reduce odor irritation to the human body, and prevent pollution to the indoor environment.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an activated carbon-coated sodium-based black talc cat litter, wherein the activated carbon-coated sodium-based black talc cat litter is prepared according to the following method: S1: dispersing black talc powder with a particle size of 100-120 mesh in a 1-4M (preferably 2M) sulfuric acid aqueous solution, condensing and refluxing at 130° C.-150° C. for 2.5 h-3 h (preferably condensing and refluxing at 150° C. for 3 h), and separating and purifying the obtained reaction product to obtain an acidified black talc powder;

[0008] S2: The acidified black talc powder and the sodium-forming agent described in step S1 are dispersed in deionized water, reacted at 70-100° C. for 10-20 min (preferably at 80° C. for 15 min) under ultrasonication, and the resulting reaction solution is separated and washed to obtain a sodium-based black talc powder; the sodium-forming agent comprises the following components in mass fractions: 5%-10% trisodium phosphate and 90%-95% sodium carbonate (preferably 8% trisodium phosphate and 92% sodium carbonate); the mass of the sodium-forming agent is 3%-10% (preferably 5%) of the mass of the acidified black talc powder;

[0009] S3: Dispersing the activated carbon powder in a 45%-55% (preferably 50%) sulfuric acid aqueous solution, immersing and stirring for 8-12 hours (preferably 12 hours), and subjecting the resulting mixture to a first heat treatment at 80-100° C. for 1-2 hours (preferably 100° C. for 2 hours) to obtain an acidified activated carbon slurry; the volume of the sulfuric acid aqueous solution is 3-5 mL / g (4 mL / g in one embodiment of the present invention) based on the mass of the activated carbon powder;

[0010] The sodium-based black talc powder described in step S2 is uniformly mixed with the acidified activated carbon slurry, and subjected to a second heat treatment at 80-100° C. for 24 h to 48 h (preferably at 100° C. for 24 h) to obtain activated carbon-coated sodium-based black talc powder; the mass of the sodium-based black talc powder is 15-20% (preferably 20%) of the total mass of the sodium-based black talc powder and the activated carbon powder;

[0011] S4: performing disc granulation with the activated carbon-coated sodium-based black talc powder and a binder described in step S3 to obtain the activated carbon-coated sodium-based black talc cat litter.

[0012] Furthermore, the volume of the aqueous sulfuric acid solution in step S1 is 3-5 mL / g based on the mass of the black talc powder, and is 4 mL / g in one embodiment of the present invention.

[0013] Furthermore, the separation and purification in step S1 is as follows: cooling the reaction product to room temperature, allowing it to settle, washing the resulting precipitate with deionized water by centrifugation until it becomes neutral, and drying to obtain the acidified black talc powder.

[0014] Furthermore, the volume of the deionized water in step S2 is 3-5 mL / g based on the total mass of the acidified black talc powder and the sodium-forming agent, and is 4 mL / g in one embodiment of the present invention.

[0015] Furthermore, in step S2, the power of the ultrasound is 300W and the frequency is 40KHz.

[0016] Furthermore, the separation and washing in step S2 is as follows: centrifuging the reaction solution, washing with deionized water until the supernatant is neutral, drying the obtained precipitate, grinding and dispersing it to obtain the sodium-based black talc powder.

[0017] In one embodiment of the present invention, the disc granulation operation in step S4 is as follows: 1 / 5 of the activated carbon-coated sodium-based black talc powder is put into the disc granulator, and after sufficient dispersion, the remaining activated carbon-coated sodium-based black talc powder is added while spraying the binder, the particles are collected, dried and sieved, and particles in the range of 2.00 mm to 4.00 mm are collected, which is the activated carbon-coated sodium-based black talc cat litter.

[0018] Furthermore, the binder in step S4 is water glass, and in one embodiment of the present invention, it is water glass with a concentration of 9%; furthermore, the volume of the binder is 0.1-0.15 mL / g, preferably 0.1 mL / g, based on the mass of the activated carbon-coated sodium-based black talc powder.

[0019] In one embodiment of the present invention, the rotation speed of the disc granulator in step S4 is 25 r / min.

[0020] In an embodiment of the present invention, in step S1, the black talc powder is prepared as follows:

[0021] The raw black talc (Guangfeng District, Shangrao City, Jiangxi Province) was crushed and passed through a 100-mesh standard sieve, and the sieved powder was collected;

[0022] The crushed raw black talc was added to 40 mL of anhydrous ethanol and deionized water, and the two were added to a ball mill in a volume ratio of 1:1 for wet ball milling. The ball milling time was 3 hours, and 50 g to 80 g of raw black talc powder was added to each ball mill. The ball milling speed was 600 r / min. After the ball milling, the black talc slurry was washed, centrifuged, and dried. After drying, it was ground into powder in a mortar.

[0023] The dried product is sieved using sieves with apertures of 0.5mm, 2.00mm, and 4.00mm to remove any remaining powder and oversized product particles. Particles in the 2.00mm-4.00mm size range are then collected, bagged, and numbered for storage. Particles below 0.5mm are ground and retained for the next granulation. During granulation, the disc speed should not be too high, as this can make it difficult to form pellets and cause them to scatter. Furthermore, powder may spill off the disc.

[0024] The present invention modifies raw black talc by sodiumization to increase its hydrophilicity and cation exchange capacity, thereby enhancing its adsorption performance. Sulfuric acid or hydrochloric acid is selected as the acid. This is because the acidified black talc dissolves more impurities, thereby increasing its specific surface area and interlayer spacing, exposing more adsorption sites and improving the adsorption effect. Furthermore, the increased interlayer spacing allows for the accommodation of more water molecules, enhancing water absorption.

[0025] The addition of a binder is used to bond the black talc powder used to make cat litter together, making it easier to granulate and form. Water glass (sodium silicate) is chosen as the binder because the cat litter preparation process mainly utilizes the adhesive properties of water glass and increases the agglomeration strength of the cat litter product. Furthermore, the interlayer cations of black talc are an important factor affecting its adsorption effect. These interlayer cations can combine with other organic functional groups to form complexes and can also adsorb heavy metal ions. Heterovalent ion exchange results in a loss of positive charge and the appearance of some chemically reactive sites on the mineral surface. The surface site of the mineral is the core of the surface complexation reaction, and its density determines the adsorption capacity. A larger adsorption capacity helps improve adsorption performance.

[0026] Compared with the existing technology, the beneficial effects of the present invention are: in terms of physical and chemical properties, black talc has great stability; its particle size is very fine and its dispersibility is high. It can be coated on the surface of an object and cover a large area, and can effectively cover the feces of pet cats; the Mohs hardness of black talc is 1, it is very soft and delicate, has few edges and corners, and is not easy to scratch the paw pads of pet cats; the black talc easily clumps into blocks after absorbing water, making it easy to clean. DETAILED DESCRIPTION

[0027] Below in conjunction with embodiment, embodiment of the present invention is described in detail, and advantages and features of the present invention will become clearer with description.The following implementation is only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention.It should be understood by those skilled in the art that, without departing from the spirit and scope of the present invention, the details and form of technical solution of the present invention can be modified or replaced, but these modifications and replacements all fall within the protection scope of the present invention.Unindicated specific conditions in the embodiment, carry out according to the conditions of normal conditions or manufacturer's advice.Reagents used or instrument are not indicated manufacturer, and are all conventional products that can be obtained by commercial purchase.

[0028] Example 1

[0029] In this embodiment, an activated carbon-coated sodium black talc cat litter comprises 80 parts of sodium black talc powder, 20 parts of activated carbon powder, and a binder. 100g of the powder is added to 10mL of water glass diluted by the following method: 100mL of water glass is measured with a graduated cylinder, diluted to 500mL with water, and then placed in a spray bottle for use. The following steps are followed:

[0030] 1) crushing the raw black talc and passing it through a 100-mesh standard sieve to obtain raw black talc powder; adding 40 mL of a mixed solution of anhydrous ethanol and deionized water (volume ratio of 1:1) to a ball mill, adding 80 g of the raw black talc powder to each ball mill, and wet ball milling the talc slurry for 3 hours at a ball mill speed of 600 r / min; after the ball milling, centrifuging the black talc slurry, washing the resulting precipitate with deionized water four times, and removing the resulting precipitate; drying the lower precipitate, grinding and dispersing the resulting raw black talc powder to obtain a particle size of 100-120 mesh;

[0031] 2) The wet-milled raw black talc powder was added to a flask, and a 2 mol / L sulfuric acid solution was added at a mass volume ratio of 1:4 (g: mL). The temperature in the three-necked flask was raised to 150°C and refluxed for 3 h. After cooling to room temperature, the mixture was transferred to a beaker and allowed to stand for 30 min. The supernatant was discarded, and deionized water was then added for centrifugal washing until the supernatant in the centrifuge tube became neutral. The lower precipitate was removed, dried for 12 h, and then ground to obtain the acidified black talc powder. A sodiumizing agent (8% by mass of trisodium phosphate and 92% by mass of sodium carbonate) was added to the acidified black talc powder, and the amount of the sodiumizing agent was 5% of the mass of the acidified black talc. Subsequently, deionized water was added at a solid-liquid ratio of 1:4 (the solid was the total mass of the acidified black talc powder and the sodiumizing agent). The mixture was reacted at 80° C. for 15 min under ultrasonic action (CNC ultrasonic cleaner produced by Kunshan Ultrasonic Instrument Co., Ltd., model: KQ-300DE, power: 300 W, frequency: 40 kHz). The mixture was washed with water and centrifuged until the supernatant in the centrifuge tube was neutral. The lower precipitate was dried and then ground and dispersed to obtain sodium-based black talc powder.

[0032] 3) The activated carbon powder was dispersed in a 50% sulfuric acid solution with a solid-liquid ratio of activated carbon powder to sulfuric acid solution of 1:4, and the mixture was immersed and stirred for 12 hours. The mixture was placed in a drying oven and heat-treated at 100°C for 2 hours to obtain an acidified activated carbon slurry. After all the mass parts of sodium-based black talc powder were dispersed and mixed in the acidic activated carbon slurry, the black talc powder was heat-treated at 100°C in a drying oven for 24 hours. The adhering black talc powder was ground and dispersed to obtain activated carbon-coated sodium-based black talc powder.

[0033] 4) Use a graduated cylinder to measure 100 mL of water glass (water glass model is Youyi Gu ZD-40A (water glass concentration is 45%), dilute it to 500 mL with deionized water (concentration after dilution is 9%), use the diluted water glass as a binder, add the amount of 10 mL / 100 g, start the disc granulator, first add 1 / 5 of the black talc powder to the disc, adjust the speed to 25 r / min, when the disc is covered with a layer of powder sample, start spraying the diluted water glass solution with a spray bottle and gradually add the remaining activated carbon-coated sodium-based black talc powder to start granulation; the disc granulator used is Tongda Heavy Industry TDYZ-500. When a large number of particles appear in the disc, collect them, dry the particles at 80°C for 4 h, sieve, collect particles within the range of 2.00 mm to 4.00 mm, and bag them.

[0034] Example 2

[0035] In this Example 2, an activated carbon-coated sodium black talc cat litter was prepared by adding 85 parts of sodium black talc powder prepared according to the method of Example 1, 15 parts of activated carbon powder, and 10 mL / 100 g of diluted water glass (10 mL of water glass diluted according to the method of Example 1 was added to 100 g of the powder). Granulation was performed according to the preparation method described in Example 1.

[0036] Example 3

[0037] In this embodiment 3, an activated carbon coated sodium black talc cat litter is prepared by mixing 80 parts of sodium black talc powder, 20 parts of activated carbon powder, and 13 mL / 100 g of diluted water glass. Granulation is performed according to the preparation method described in embodiment 1.

[0038] Example 4

[0039] In the fourth embodiment, an activated carbon coated sodium black talc cat litter is prepared by granulating the cat litter according to the preparation method described in the first embodiment. The raw materials include: 85 parts of sodium black talc powder, 15 parts of activated carbon powder, and 13 mL / 100 g of diluted water glass.

[0040] Example 5

[0041] In this Example 5, an activated carbon-coated sodium black talc cat litter is prepared by mixing 80 parts of sodium black talc powder, 20 parts of activated carbon powder, and 15 mL / 100 g of diluted water glass. Granulation is performed according to the preparation method described in Example 1.

[0042] Example 6

[0043] In Example 6, an activated carbon-coated sodium black talc-based cat litter is prepared by granulating the cat litter according to the preparation method described in Example 1. The raw materials include: 85 parts of sodium black talc powder, 15 parts of activated carbon powder, and 15 mL / 100 g of diluted water glass.

[0044] Example 7

[0045] An activated carbon-coated sodium-based black talc cat litter comprises 80 parts of sodium-based black talc powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Experimental Example 1 only in that the sodiumizing agent contains 5% by mass of trisodium phosphate and 95% by mass of sodium carbonate.

[0046] Example 8

[0047] An activated carbon-coated sodium-based black talc cat litter comprises 80 parts of sodium-based black talc powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Experimental Example 1 only in that the sodiumizing agent contains 10% by mass of trisodium phosphate and 90% by mass of sodium carbonate.

[0048] Example 9 Water absorption performance test

[0049] Water absorption test method: Water absorption refers to the amount of clean water that a certain mass of cat litter can absorb in a certain period of time. The experimental instruments used include: 100mL beaker, electronic scale, 50mL separatory funnel. Weigh 10g of cat litter, place it in a 100mL glass measuring cup, and use a separatory funnel to drip 50mL of warm water at a uniform speed until unabsorbed water appears in the cup. After standing for 10 minutes, slowly pour out the suspended liquid in the beaker and weigh the liquid. Test three times and take the average value. The water absorption rate of cat litter is measured as mass fraction A, and the value is expressed in %:

[0050]

[0051] Where: m is the weight of the suspended liquid poured out, in grams (g)

[0052] The results are shown in Table 1

[0053] Example 10 Dust rate

[0054] Dust content measurement: Excessive dust content in cat litter not only pollutes the indoor environment but can also cause sneezing, coughing, tearing, and even respiratory damage in cats. The dust content (W) is determined by measuring 100g of cat litter with a graduated cylinder, passing it through a 100-mesh sieve, and weighing it. The weight of the sieved material is the dust content (m).

[0055]

[0056] The results are shown in Table 1

[0057] Example 11 Agglomeration Performance

[0058] Agglomeration Performance Test: Weigh 50g of cat litter using an electronic balance and place it in a flat tray. Use a 20mL pipette to draw 20mL of room-temperature deionized water into a pre-fixed acid burette, placing the tip of the pipette 3cm from the top surface of the cat litter. Fully tighten the piston of the acid burette and rapidly dispense the deionized water. After allowing the solution to stand for 20 seconds, scoop out any clumping litter. Drop the clumped litter from a height of 15cm to the ground and observe its deagglomeration. The results are shown in Table 1.

[0059] Example 12 Deodorization performance

[0060] Deodorization performance test: Deodorization performance is expressed as ammonia absorption X (mmol / 100g)

[0061] 1) Weigh 10.00 g of cat litter sample into a beaker, add 50 mL of 0.1 mol / L ammonium chloride solution and 25 mL of paper pulp (3 pieces of experimental filter paper soaked and then mashed with water), boil on a hot plate and keep warm for 30 min.

[0062] 2) Remove it, filter it with slow qualitative filter paper, and wash it with boiling 1.0 mol / L ammonium chloride solution until there is no calcium and magnesium ions in the outflowing solution (check method: add a few milliliters of ammonia-ammonium chloride buffer solution and 1 drop of acid chrome blue K indicator in a small beaker, and collect some filtrate. If the solution does not change color, it means it has been washed).

[0063] 3) Then use warm water to wash until there is no chloride ion (check with silver nitrate solution), and rinse the tail of the funnel with water to prevent contamination by a small amount of ammonium chloride.

[0064] 4) Replace the funnel with a clean beaker and add 80 mL of boiling 1.0 mol / L potassium chloride solution in three portions. After the solution in the funnel has drained out, add 15 mL of formaldehyde solution (neutralized with 0.1 mol / L sodium hydroxide standard solution before use until the phenolphthalein indicator turns pink) to the beaker. Using phenolphthalein as the indicator, titrate with 0.1 mol / L sodium hydroxide standard solution until the solution turns red.

[0065] 5) Add another 1.0 mol / L potassium chloride solution to the beaker. If the red color of the solution does not fade within 30 seconds, it indicates that the endpoint has been reached. If the red color fades, repeat the titration until a stable red color is reached. Calculate the result based on the total volume of sodium hydroxide standard solution consumed in the titration.

[0066]

[0067] The results are shown in Table 1

[0068] Comparative Example 1

[0069] Platinum Diamond Purple Label 25-pound bentonite cat litter, item number 091854604155, is available on the market.

[0070] Comparative Example 2: No sodium agent

[0071] A carbon-coated acidified black talc cat litter, comprising 80 parts of acidified black talc powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation steps are as follows:

[0072] 1) The raw black talc powder obtained by wet ball milling according to step 1) of Example 1 was added to a flask, and a 2 mol / L sulfuric acid solution was added at a solid-liquid ratio of 1:4. The mixture was in a water bath at 80° C., magnetically stirred for 3 h, washed with water, centrifuged until neutral, dried, and ground to obtain an acidified black talc powder.

[0073] 2) The activated carbon powder was dispersed in a 50% sulfuric acid solution with a solid-liquid ratio of activated carbon powder to acid solution of 1:4, and the mixture was immersed and stirred for 12 hours. The mixture was placed in a drying oven and heat treated at 100°C for 2 hours to obtain an acidified activated carbon slurry. The acidified black talc powder was dispersed and mixed in the acidified activated carbon slurry, calcined at 500°C for 2 hours, and then ground into powder to obtain activated carbon-coated acidified black talc powder.

[0074] 3) Use a graduated cylinder to measure 100 mL of water glass (water glass model is Youyi Gu ZD-40A (water glass concentration is 45%), dilute it to 500 mL (concentration after dilution is 9%), use the diluted water glass as a binder, add 10 mL / 100 g of it, start the disc granulator, first add 1 / 5 of the black talc powder to the disc, adjust the speed to 25 r / min, when the disc is covered with a layer of powder sample, start spraying the diluted water glass solution with a spray bottle and gradually add the remaining activated carbon-coated sodium-based black talc powder to start granulation; the disc granulator used is a Tongda Heavy Industry TDYZ-500. When a large number of particles appear in the disc, collect them, dry the particles at 80°C for 4 h, sieve, collect particles within the range of 2.00 mm to 4.00 mm, and bag them.

[0075] Comparative Example 3: No acidification, no sodium agent

[0076] A raw black talc cat litter, whose raw materials include 100 parts of raw black talc cat litter and 10 mL / 100 g of water glass, is prepared according to the following steps:

[0077] 1) The raw black talc powder was wet-milled according to step 1) of Example 1.

[0078] 2) Use a graduated cylinder to measure 100 mL of water glass (water glass model is Youyi Gu ZD-40A (water glass concentration is 45%)), dilute it to 500 mL, and use the diluted water glass as a binder at an addition amount of 10 mL / 100 g. Spray it into the granulation of raw black talc powder as the raw material. The disc speed is 25 r / min. The disc granulator used is Tongda Heavy Industry TDYZ-500. When a large number of particles appear in the disc, collect them, dry the particles, sieve them, collect particles within the range of 2.00 mm to 4.00 mm, and bag them.

[0079] Comparative Example 4: Non-acidified activated carbon

[0080] An acidified black talc cat litter, whose raw materials include 100 parts of acidified black talc powder and 10 mL / 100 g of water glass, is prepared according to the following steps:

[0081] 1) The raw black talc powder was wet-milled according to step 1) of Example 1.

[0082] 2) The wet-milled raw black talc powder was added to a flask, and a 2 mol / L sulfuric acid solution was added at a solid-liquid ratio of 1:4. The mixture was incubated in a water bath at 80°C, magnetically stirred for 3 h, washed with water, centrifuged until neutral, dried, and ground to obtain an acidified black talc powder.

[0083] 3) Use a graduated cylinder to measure 100 mL of water glass (water glass model is Youyi Gu ZD-40A (water glass concentration is 45%)), dilute it to 500 mL, and use the diluted water glass as a binder at a rate of 10 mL / 100 g. Spray it into the granulation of acidified black talc powder as the raw material. The disc speed is 25 r / min. The disc granulator used is Tongda Heavy Industry TDYZ-500. When a large number of particles appear on the disc, collect them, dry the particles, sieve them, collect the particles within the range of 2.00 mm to 4.00 mm, and bag them.

[0084] Comparative Example 5 Acidification of black talc at 80°C

[0085] A sodium-based black talc cat litter, whose raw materials include 100 parts of sodium-based black talc powder and 10 mL / 100 g of water glass, is prepared according to the following steps:

[0086] 1) The raw black talc powder was wet-milled according to step 1) of Example 1.

[0087] 2) The wet ball-milled raw black talc powder was added to a flask, and a 2 mol / L sulfuric acid solution was added at a solid-liquid ratio of 1:4. The mixture was placed in a water bath at 80°C, magnetically stirred for 3 h, washed with water, and centrifuged to neutrality. After drying, the mixture was ground to obtain an acidified black talc powder. A sodiumizing agent (8% by mass of trisodium phosphate and 92% by mass of sodium carbonate) was added to the acidified black talc powder. The amount of the sodiumizing agent was 5% of the mass of the acidified black talc. Subsequently, deionized water was added at a solid-liquid ratio of 1:4 (the solid was the total mass of the acidified black talc powder and the sodiumizing agent). The mixture was reacted at 80°C under ultrasonication for 15 min, then washed with water, centrifuged to neutrality, dried, and ground to obtain a sodium-based black talc powder.

[0088] 3) Use a graduated cylinder to measure 100 mL of water glass (water glass model is Youyi Gu ZD-40A (water glass concentration is 45%)), dilute it to 500 mL, and use the diluted water glass as a binder at an addition amount of 10 mL / 100 g. Spray it into the granulation of sodium black talc powder as the raw material. The disc speed is 25 r / min. The disc granulator used is Tongda Heavy Industry TDYZ-500. When a large number of particles appear in the disc, collect them, dry the particles, sieve them, collect the particles within the range of 2.00 mm to 4.00 mm, and bag them.

[0089] Comparative Example 6

[0090] An activated carbon-coated sodium-based black talc cat litter comprises 80 parts of sodium-based black talc powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Example 1 in that the sodiumizing agent is sodium hydroxide (used in an amount of 5% by mass of the acidified black talc powder).

[0091] Comparative Example 7

[0092] An activated carbon-coated sodium-based black talc cat litter comprises 80 parts of sodium-based black talc powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Example 1 in that the sodiumizing agent is sodium carbonate (the amount used is 5% of the mass of the acidified black talc powder).

[0093] Comparative Example 8

[0094] An activated carbon-coated sodium-based black talc cat litter comprises 80 parts of sodium-based black talc powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Example 1 in that the sodiumizing agent is trisodium phosphate (the amount used is 5% of the mass of the acidified black talc powder).

[0095] Comparative Example 9

[0096] An activated carbon-coated sodium-based black talc cat litter comprises 80 parts of sodium-based black talc powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Example 1 in that the sodiumizing agent is sodium chloride (the amount used is 5% of the mass of the acidified black talc powder).

[0097] Comparative Example 10

[0098] An activated carbon-coated sodium bentonite cat litter, comprising 80 parts sodium bentonite powder, 20 parts activated carbon, and 10 mL / 100 g of water glass. The product itself is a 100-120 mesh calcium bentonite powder, thus eliminating the need for ball milling. The remaining preparation process is the same as in Example 1, including the acidification, sodiumization, activated carbon coating, and granulation of the black talc. The parameters are the same as in Example 1. (The bentonite used to prepare the sodium bentonite powder is calcium bentonite model HY-998, a product of Zhejiang Hongyu New Materials Co., Ltd.)

[0099] Comparative Example 11

[0100] An activated carbon-coated sodium bentonite cat litter comprises 80 parts of sodium bentonite powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Comparative Example 10 in that the sodiumizing agent is sodium chloride (the amount used is 5% of the mass of the acidified black talc powder).

[0101] Comparative Example 12

[0102] An activated carbon-coated sodium bentonite cat litter comprises 80 parts of sodium bentonite powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Comparative Example 10 in that the sodiumizing agent is trisodium phosphate (the amount used is 5% of the mass of the acidified black talc powder).

[0103] Comparative Example 13

[0104] An activated carbon-coated sodium bentonite cat litter, whose raw materials include 80 parts of sodium bentonite powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Comparative Example 10 only in that the sodiumizing agent is sodium carbonate (the amount used is 5% of the mass of the acidified black talc powder).

[0105] Comparative Example 14

[0106] An activated carbon-coated sodium bentonite cat litter comprises 80 parts of sodium bentonite powder, 20 parts of activated carbon, and 10 mL / 100 g of water glass. The preparation process is different from that of Comparative Example 10 in that the sodiumizing agent is sodium hydroxide (the amount used is 5% of the mass of the acidified black talc powder).

[0107] Table 1 Test results of Examples 1-6 and Comparative Examples 1-8

[0108]

[0109]

[0110] Comparing Comparative Examples 3-5, it can be seen that the black talc cat litter after acidification and sodiumization can significantly improve the water absorption and deodorization performance, and can effectively reduce the dust rate; comparing Example 1 with Comparative Example 2, it can be seen that the deodorization performance of the black talc cat litter after sodiumization is significantly improved; from Examples 1-6, it can be seen that increasing the amount of binder used helps to reduce the dust rate of the cat litter, and the activated carbon-coated sodium-based black talc cat litter has the best comprehensive performance in Example 1; comparing Example 1 with Comparative Example 1, it can be seen that the activated carbon-coated sodium-based black talc cat litter has certain advantages over the commercially available bentonite cat litter in terms of comprehensive performance; from Examples 1, 7, and 8, it can be seen that the best ammonia absorption effect is achieved when the sodiumizing agent contains 8% by mass of trisodium phosphate and 92% by mass of sodium carbonate. From Example 1 and Comparative Examples 6-13, it can be seen that under the same sodiumizing agent in different ores, trisodium phosphate and sodium carbonate are mixed and the ammonia absorption effect is the best, and the water absorption and ammonia absorption effects in black talc are better than those in bentonite.

[0111] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate the activated carbon-coated sodium-based cat litter of the present invention, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary ingredients, selection of specific methods, etc., all fall within the scope of protection and disclosure of the present invention.

Claims

1. An activated carbon coated sodium-based black talc cat litter, characterized in that The activated carbon-coated sodium-based black talc cat litter is prepared as follows: S1: dispersing black talc powder with a particle size of 100-120 mesh in a 1-4M sulfuric acid aqueous solution, refluxing at 130° C.-150° C. for 2.5 h-3 h, and separating and purifying the obtained reaction product to obtain acidified black talc powder; S2: The acidified black talc powder and the sodium-forming agent described in step S1 are dispersed in deionized water, reacted at 70-100°C for 10-20 minutes under ultrasonication, and the resulting reaction solution is separated and washed to obtain sodium-based black talc powder; the sodium-forming agent is composed of the following components by mass: 5%-10% trisodium phosphate and 90%-95% sodium carbonate; the mass of the sodium-forming agent is 3%-10% of the mass of the acidified black talc powder; S3: Dispersing the activated carbon powder in a 45%-55% sulfuric acid aqueous solution, immersing and stirring for 8-12 hours, and subjecting the resulting mixture to a first heat treatment at 80-100°C for 1-2 hours to obtain an acidified activated carbon slurry; the volume of the sulfuric acid aqueous solution is 3-5 mL / g based on the mass of the activated carbon powder; The sodium-based black talc powder described in step S2 is uniformly mixed with the acidified activated carbon slurry, and subjected to a second heat treatment at 80-100° C. for 24-48 hours to obtain activated carbon-coated sodium-based black talc powder; the mass of the sodium-based black talc powder is 15-20% of the total mass of the sodium-based black talc powder and the activated carbon powder; S4: performing disc granulation with the activated carbon-coated sodium-based black talc powder and a binder described in step S3 to obtain the activated carbon-coated sodium-based black talc cat litter.

2. The activated carbon-coated sodium-based black talc cat litter according to claim 1, wherein: The volume of the sulfuric acid aqueous solution in step S1 is 3-5 mL / g based on the mass of the black talc powder.

3. The activated carbon-coated sodium-based black talc cat litter according to claim 1, wherein: The separation and purification in step S1 is as follows: cooling the reaction product to room temperature, allowing it to settle, washing the resulting precipitate with deionized water by centrifugation until it becomes neutral, and drying it to obtain the acidified black talc powder.

4. The activated carbon-coated sodium-based black talc cat litter according to claim 1, wherein: The volume of the deionized water in step S2 is 3-5 mL / g based on the total mass of the acidified black talc powder and the sodium-forming agent.

5. The activated carbon-coated sodium-based black talc cat litter according to claim 1, wherein: In step S2, the power of the ultrasound is 300W and the frequency is 40KHz.

6. The activated carbon-coated sodium-based black talc cat litter according to claim 1, wherein: The separation and washing in step S2 is as follows: centrifuging the reaction solution, washing with deionized water until the supernatant is neutral, drying the obtained precipitate, grinding and dispersing it to obtain the sodium-based black talc powder.

7. The activated carbon-coated sodium-based black talc cat litter according to claim 1, wherein: The disc granulation operation in step S4 is as follows: 1 / 5 of the activated carbon-coated sodium-based black talc powder is put into the disc granulator, and after sufficient dispersion, the remaining activated carbon-coated sodium-based black talc powder is added while spraying the binder, the particles are collected, dried and sieved, and particles within the range of 2.00 mm to 4.00 mm are collected, which is the activated carbon-coated sodium-based black talc cat litter.

8. The activated carbon-coated sodium-based black talc cat litter according to claim 1 or 7, wherein: The binder in step S4 is water glass.

9. The activated carbon-coated sodium-based black talc cat litter according to claim 1 or 7, wherein: The binder in step S4 is water glass with a volume concentration of 9%, and the volume of the binder is 0.1-0.15 mL / g based on the mass of the activated carbon-coated sodium-based black talc powder.

10. The activated carbon-coated sodium-based black talc cat litter according to claim 1, wherein: The rotation speed of the disc granulation in step S4 is 25 r / min.

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