Light calcium carbonate, method of preparation and use

Abstract

The application discloses light calcium carbonate, a preparation method and application, and comprises the following steps: S1: grinding calcium oxide powder and grinding aids to obtain primary crushed particles, adding hot water to digest, then diluting with water, and uniformly stirring at high speed to prepare a calcium hydroxide suspension liquid; S2: carbon dioxide gas is introduced into the calcium hydroxide suspension liquid, and modification is carried out under the condition of high-speed stirring; when the pH value of the system is 7-8, a surface treatment agent composed of sodium hexametaphosphate, bis-palmitoyl tartaric acid diester and polymethyl methacrylate is used to modify the surface of the light calcium carbonate, a uniform, stable and oil-wet hydrophobic wrapping layer is formed, the hydrophobicity and dispersibility of the light calcium carbonate are significantly improved, and the ion aggregation of the light calcium carbonate is effectively avoided, so that the particle size is not increased, the function of the superfine particles is not lost, and when the light calcium carbonate is used as a filler of rubber products, the heat resistance, strength and rigidity of the rubber products can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of calcium carbonate preparation, in particular to light calcium carbonate, a preparation method and application thereof. BACKGROUND

[0002] Light calcium carbonate (LCC) is also known as light calcium or precipitated calcium carbonate (PCC), which is different from heavy calcium carbonate prepared by mechanically grinding natural carbonate, and is prepared by chemical processing, mainly by calcining limestone to generate lime, then digesting the lime with water to form calcium hydroxide, carbonating by passing in carbon dioxide, and finally drying and crushing the obtained precipitate to obtain light calcium carbonate. As a basic raw material for chemical production, light calcium carbonate can be widely used in papermaking, plastics, chemical fibers, rubber, daily chemical industry, paint, medicine, food and many other fields.

[0003] Light calcium carbonate has a small particle size, a large specific surface area and a high specific surface energy, and is prone to particle coagulation and agglomeration during preparation and post-processing, forming secondary particles, which makes the particle size larger, and loses the function of superfine particles in the final application process, thereby affecting the actual application effect, i.e., cannot play the role of functional filler. SUMMARY

[0004] The present application provides light calcium carbonate, a preparation method and application thereof to solve the problems in the prior art, and the specific technical solutions are as follows:

[0005] On the one hand, the present application provides a preparation method of light calcium carbonate, comprising the following steps:

[0006] S1: grinding calcium oxide powder with grinding aid to obtain primary crushed particles, digesting in hot water, then diluting with water, and then uniformly stirring at high speed to prepare a calcium hydroxide suspension;

[0007] S2: passing carbon dioxide gas into the calcium hydroxide suspension, and performing under high-speed stirring, when the pH value of the system is 7-8, stopping the passage of carbon dioxide gas, to obtain calcium carbonate slurry;

[0008] S3: mixing sodium hexametaphosphate, bis-palmitoyl tartaric acid diester and polymethyl methacrylate according to a mass ratio of (1-5) :(3-4) :(2-7), uniformly stirring by ultrasonic mixing, and preparing into a surface treatment agent solution;

[0009] S4: adding the surface treatment agent solution into the calcium carbonate slurry, uniformly stirring by ultrasonic stirring, and performing coating treatment for 1-1.5 h to obtain surface modified calcium carbonate slurry;

[0010] S5: performing drying treatment on the surface modified calcium carbonate slurry in a carbon dioxide gas atmosphere to obtain the light calcium carbonate.

[0011] In the technical scheme, the surface of the light calcium carbonate is modified by using a surface treatment agent composed of sodium hexametaphosphate, bis-palmitoyl tartaric acid diester and polymethyl methacrylate, so that a uniform and stable oil-wet and water-repellent coating layer is formed, the hydrophobicity and dispersibility of the light calcium carbonate are significantly improved, and the ion aggregation of the light calcium carbonate is effectively avoided, so that the particle size of the light calcium carbonate is prevented from being increased, and the functions of the ultra-fine particles are maintained; when the light calcium carbonate is used as a filler of rubber products, the heat resistance, strength and rigidity of the rubber products are improved.

[0012] As an improvement of the above technical scheme, the particle size of the crushed calcium carbonate is 20-38 um.

[0013] In step S4, the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is (14-20) : 1.

[0014] As an improvement of the above technical scheme, the grinding aid is a mixture of phosphoric acid ester and ethanol.

[0015] In the technical scheme, in the grinding process, the phosphoric acid ester can be attached to the surface of the calcium oxide particles, and when the calcium oxide particles form a calcium hydroxide suspension, the phosphoric acid ester can react with Ca 2+ ions in the calcium carbonate to form a phosphoric acid ester coating layer on the surface of the calcium carbonate particles, so that the dispersibility of the calcium carbonate is improved, and the aggregation of the calcium carbonate during the growth process is effectively avoided.

[0016] As an improvement of the above technical scheme, the phosphoric acid ester surfactant includes one or more of fatty alcohol ether phosphate, phenol ether phosphate, lauryl phosphate and isotridecanol phosphate.

[0017] As an improvement of the above technical scheme, in step S2, the volume content of the carbon dioxide gas is 25-30%.

[0018] In a second aspect, the light calcium carbonate is prepared by using the preparation method described above.

[0019] In a third aspect, the light calcium carbonate described above is used as a filler.

[0020] In summary, the present application has at least one of the following beneficial technical effects:

[0021] The present application adopts sodium hexametaphosphate, bis-palmitoyl tartaric acid diester and polymethyl methacrylate to modify the surface of light calcium carbonate, form a uniform and stable oil-wet hydrophobic coating layer, significantly improve the hydrophobicity and dispersibility of light calcium carbonate, effectively avoid the particle size of light calcium carbonate ion from agglomeration, so as to lose the function of superfine particles, and when used as a filler of rubber products, the heat resistance, strength and stiffness of the rubber products can be enhanced. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0023] The preparation method of light calcium carbonate comprises the following steps:

[0024] S1: grinding calcium oxide powder with grinding aids to obtain primary crushed particles, adding hot water for digestion, then diluting with water, and uniformly stirring at high speed to prepare a calcium hydroxide suspension;

[0025] S2: passing carbon dioxide gas into the calcium hydroxide suspension, and performing under high-speed stirring, when the pH value of the system is 7-8, stopping the passage of carbon dioxide gas, to obtain a calcium carbonate slurry;

[0026] S3: mixing sodium hexametaphosphate, bis-palmitoyl tartaric acid diester and polymethyl methacrylate according to a mass ratio of (1-5):(3-4):(2-7), heating, uniformly stirring by ultrasonic mixing, and preparing into a surface treatment agent solution;

[0027] S4: adding the surface treatment agent solution into the calcium carbonate slurry, uniformly stirring by ultrasonic stirring, and performing coating treatment for 1-1.5h to obtain a surface modified calcium carbonate slurry;

[0028] S5: performing drying treatment on the surface modified calcium carbonate slurry under the atmosphere of carbon dioxide gas to obtain the light calcium carbonate.

[0029] The particle size of the crushed particles is 20-38um.

[0030] In step S4, the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is (14-20):1.

[0031] The grinding aid is a mixture of phosphate ester and ethanol.

[0032] The phosphate ester surfactant comprises one or more of fatty alcohol ether phosphate, phenol ether phosphate, lauryl phosphate and isotridecanol phosphate.

[0033] The volume content of the carbon dioxide gas is 25-30% in the step S2.

[0034] Light calcium carbonate, which is obtained by the preparation method described above.

[0035] Prior to the present application, due to the small particle size of light calcium carbonate, it has a large specific surface area and a high specific surface energy, and is extremely easy to cause particle coagulation and agglomeration during preparation and post-processing, forming secondary particles, making the particle size larger, and losing the functions of superfine particles in the final application process, thereby affecting the actual application effect, i.e., not being able to play the role of functional filler.

[0036] The inventors of the present application modify the surface of light calcium carbonate by using sodium hexametaphosphate, dipalmitoyl tartaric acid diester, and polymethyl methacrylate compounded surface treatment agent, form a uniform and stable lipophilic hydrophobic wrapping layer, significantly improve the hydrophobicity and dispersibility of light calcium carbonate, effectively avoid the particle size of light calcium carbonate ions from becoming larger due to agglomeration, thereby losing the functions of superfine particles, and when used as a rubber product filler, can enhance the heat resistance, strength, and stiffness of the rubber product.

[0037] In the present application, all raw materials are purchased from the market unless otherwise specified.

[0038] The present application is further described in detail below in conjunction with examples.

[0039] Preparation Example 1

[0040] In the present preparation example, the sodium hexametaphosphate is 1 kg, the dipalmitoyl tartaric acid diester is 4 kg, and the polymethyl methacrylate is 2 kg.

[0041] Preparation Example 2

[0042] In the present preparation example, the sodium hexametaphosphate is 2 kg, the dipalmitoyl tartaric acid diester is 3.7 kg, and the polymethyl methacrylate is 4 kg.

[0043] Preparation Example 3

[0044] In the present preparation example, the sodium hexametaphosphate is 3 kg, the dipalmitoyl tartaric acid diester is 3.4 kg, and the polymethyl methacrylate is 6 kg.

[0045] Preparation Example 4

[0046] In the present preparation example, the sodium hexametaphosphate is 5 kg, the dipalmitoyl tartaric acid diester is 3 kg, and the polymethyl methacrylate is 7 kg. Specific Embodiments

[0048] Example 1

[0049] The calcium oxide powder is ground with grinding aids to obtain primary crushed particles, which are digested in hot water, then diluted with water, and stirred uniformly at high speed to prepare a calcium hydroxide suspension;

[0050] Carbon dioxide gas is introduced into the calcium hydroxide suspension, and the process is carried out under high-speed stirring. When the pH value of the system is 7-8, the introduction of carbon dioxide gas is stopped, and a calcium carbonate slurry is obtained;

[0051] The surface treatment agent prepared in Preparation Example 1 is uniformly mixed and stirred by ultrasonic waves to prepare a surface treatment agent solution;

[0052] The surface treatment agent solution is added to the calcium carbonate slurry, so that the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 14:1;

[0053] The surface treatment agent solution is added to the calcium carbonate slurry, so that the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 14:1;

[0054] The surface-modified calcium carbonate slurry is dried under a carbon dioxide gas atmosphere to obtain the light calcium carbonate.

[0055] Example 2

[0056] The calcium oxide powder is ground with grinding aids to obtain primary crushed particles, which are digested in hot water, then diluted with water, and stirred uniformly at high speed to prepare a calcium hydroxide suspension;

[0057] Carbon dioxide gas is introduced into the calcium hydroxide suspension, and the process is carried out under high-speed stirring. When the pH value of the system is 7-8, the introduction of carbon dioxide gas is stopped, and a calcium carbonate slurry is obtained;

[0058] The surface treatment agent prepared in Preparation Example 1 is uniformly mixed and stirred by ultrasonic waves to prepare a surface treatment agent solution;

[0059] The surface treatment agent solution is added to the calcium carbonate slurry, so that the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 14:1;

[0060] The surface-modified calcium carbonate slurry is dried under a carbon dioxide gas atmosphere to obtain the light calcium carbonate.

[0061] Example 3

[0062] The calcium oxide powder is ground with grinding aids to obtain primary crushed particles, which are digested in hot water, then diluted with water, and stirred uniformly at high speed to prepare a calcium hydroxide suspension;

[0063] Carbon dioxide gas is bubbled into the calcium hydroxide suspension, and the process is carried out under high-speed stirring. When the pH value of the system is 7-8, the bubbling of carbon dioxide gas is stopped, and calcium carbonate slurry is obtained;

[0064] The surface treatment agent prepared in Preparation Example 1 is uniformly mixed by ultrasonic mixing and stirring to prepare a surface treatment agent solution;

[0065] The surface treatment agent solution is added to the calcium carbonate slurry, and the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 18:1. The mixture is uniformly stirred by ultrasonic mixing and is subjected to coating treatment for 1-1.5 h to obtain a surface-modified calcium carbonate slurry;

[0066] The surface-modified calcium carbonate slurry is subjected to drying treatment in an atmosphere of carbon dioxide gas to obtain the light calcium carbonate.

[0067] Example 4

[0068] The calcium oxide powder is ground with a grinding aid to obtain primary crushed particles. The primary crushed particles are digested in hot water, and then diluted with water. The mixture is uniformly stirred at high speed to prepare a calcium hydroxide suspension;

[0069] Carbon dioxide gas is bubbled into the calcium hydroxide suspension, and the process is carried out under high-speed stirring. When the pH value of the system is 7-8, the bubbling of carbon dioxide gas is stopped, and calcium carbonate slurry is obtained;

[0070] The surface treatment agent prepared in Preparation Example 1 is uniformly mixed by ultrasonic mixing and stirring to prepare a surface treatment agent solution;

[0071] The surface treatment agent solution is added to the calcium carbonate slurry, and the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 20:1. The mixture is uniformly stirred by ultrasonic mixing and is subjected to coating treatment for 1-1.5 h to obtain a surface-modified calcium carbonate slurry;

[0072] The surface-modified calcium carbonate slurry is subjected to drying treatment in an atmosphere of carbon dioxide gas to obtain the light calcium carbonate.

[0073] Comparative Example 1

[0074] The calcium oxide powder is ground with a grinding aid to obtain primary crushed particles. The primary crushed particles are digested in hot water, and then diluted with water. The mixture is uniformly stirred at high speed to prepare a calcium hydroxide suspension;

[0075] Carbon dioxide gas is bubbled into the calcium hydroxide suspension, and the process is carried out under high-speed stirring. When the pH value of the system is 7-8, the bubbling of carbon dioxide gas is stopped, and calcium carbonate slurry is obtained;

[0076] The surface treatment agent prepared in Preparation Example 1 is uniformly mixed by ultrasonic mixing and stirring to prepare a surface treatment agent solution;

[0077] The surface treatment agent solution is added to the calcium carbonate slurry, so that the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 12:0.5, and the surface treatment agent solution is uniformly stirred by ultrasonic agitation for 1-1.5 hours to obtain a surface-modified calcium carbonate slurry;

[0078] The surface-modified calcium carbonate slurry is subjected to drying treatment in a carbon dioxide gas atmosphere to obtain the light calcium carbonate.

[0079] Comparative Example 2

[0080] The calcium oxide powder is ground with a grinding aid to obtain primary crushed particles, which are then digested in hot water, diluted with water, and uniformly stirred at high speed to prepare a calcium hydroxide suspension;

[0081] Carbon dioxide gas is introduced into the calcium hydroxide suspension, and the introduction of the carbon dioxide gas is stopped when the pH value of the system is 7-8, to obtain a calcium carbonate slurry;

[0082] The surface treatment agent prepared in Preparation Example 1 is uniformly mixed by ultrasonic agitation to prepare a surface treatment agent solution;

[0083] The surface treatment agent solution is added to the calcium carbonate slurry, so that the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 22:1.5, and the surface treatment agent solution is uniformly stirred by ultrasonic agitation for 1-1.5 hours to obtain a surface-modified calcium carbonate slurry;

[0084] The surface-modified calcium carbonate slurry is subjected to drying treatment in a carbon dioxide gas atmosphere to obtain the light calcium carbonate.

[0085] The light calcium carbonates prepared in Examples 1-4 and Comparative Examples 1-2 above are tested for activation rate and specific surface area under the following conditions: the test is performed in accordance with GB / T 19281-2014 “Calcium Carbonate Analysis Method”;

[0086] The oil absorption amount is tested in accordance with the method described in GB / T 19281-2003. The test results are shown in Table 1.

[0087] Table 1

[0088]

[0089] The light calcium carbonates prepared in Examples 1-4 of the present application are modified by using a surface treatment agent composed of sodium hexametaphosphate, bis-palmitoyl tartaric acid diester, and polymethyl methacrylate, to form a uniform and stable oil-wet hydrophobic coating layer, which significantly improves the hydrophobicity and dispersibility of the light calcium carbonate. When used as a filler for rubber products, the light calcium carbonate can enhance the heat resistance, strength, and rigidity of the rubber products.

[0090] In the preparation process of calcium carbonate, with the formation of calcium carbonate particles, part of which is adsorbed on the surface of the undissolved calcium hydroxide particles, thereby hindering the dissolution and ionization of calcium hydroxide, resulting in a decrease in conductivity, as the reaction continues, the chain calcium carbonate will gradually agglomerate on the surface of calcium hydroxide, at this time, the agglomeration of chain calcium carbonate is broken by high-speed shearing, and dispersed calcium carbonate is reformed, which is convenient for subsequent use;

[0091] In the grinding process of the mixture of calcium oxide powder and phosphoric acid ester and ethanol, the phosphoric acid ester can adhere to the surface of the calcium oxide particles. When the calcium oxide particles form a calcium hydroxide suspension, carbon dioxide gas is introduced. The phosphoric acid ester can react with Ca2+ ions in calcium carbonate, thereby forming a phosphoric acid ester coating layer on the surface of the calcium carbonate particles, preliminarily improving the dispersion performance of the calcium carbonate, and effectively avoiding the formation of secondary particles due to agglomeration during the growth process of the calcium carbonate, so that the particle size is increased.

[0092] The proportions of sodium hexametaphosphate, dipalmitoyl tartaric acid diester and polymethyl methacrylate in the present application have a synergistic effect. Based on this, examples 5-7 are designed based on example 2. In examples 5-7, the proportions of sodium hexametaphosphate, dipalmitoyl tartaric acid diester and polymethyl methacrylate are changed, but the preparation method remains unchanged. The specific embodiments are as follows.

[0093] Example 5

[0094] Grind the calcium oxide powder with the grinding aid to obtain primary crushed particles. Add hot water to digest, then dilute with water, and then uniformly stir to prepare a calcium hydroxide suspension;

[0095] Introduce carbon dioxide gas into the calcium hydroxide suspension under high-speed stirring. When the pH value of the system is 7-8, stop introducing carbon dioxide gas, and obtain a calcium carbonate slurry;

[0096] Mix and stir the surface treatment agent prepared in Preparation Example 2 uniformly by ultrasonic wave to prepare a surface treatment agent solution;

[0097] Add the surface treatment agent solution to the calcium carbonate slurry so that the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 16:1. Uniformly stir under ultrasonic wave and perform coating treatment for 1-1.5 h to obtain a surface-modified calcium carbonate slurry;

[0098] The surface-modified calcium carbonate slurry is dried under the atmosphere of carbon dioxide gas to obtain the light calcium carbonate.

[0099] Example 6

[0100] The calcium oxide powder is ground with grinding aids to obtain primary crushed particles, which are then digested in hot water, diluted with water, and stirred at high speed to obtain a calcium hydroxide suspension;

[0101] Carbon dioxide gas is introduced into the calcium hydroxide suspension, and the stirring is performed at high speed. When the pH value of the system is 7-8, the introduction of the carbon dioxide gas is stopped, and a calcium carbonate slurry is obtained;

[0102] The surface treatment agent prepared in Preparation Example Three is uniformly mixed by ultrasonic stirring to obtain a surface treatment agent solution;

[0103] The surface treatment agent solution is added to the calcium carbonate slurry, and the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 16:1. The mixture is uniformly stirred by ultrasonic stirring, and coated for 1-1.5 hours to obtain a surface-modified calcium carbonate slurry;

[0104] The surface-modified calcium carbonate slurry is dried in a carbon dioxide gas atmosphere to obtain the light calcium carbonate.

[0105] Example 7

[0106] The calcium oxide powder is ground with grinding aids to obtain primary crushed particles, which are then digested in hot water, diluted with water, and stirred at high speed to obtain a calcium hydroxide suspension;

[0107] Carbon dioxide gas is introduced into the calcium hydroxide suspension, and the stirring is performed at high speed. When the pH value of the system is 7-8, the introduction of the carbon dioxide gas is stopped, and a calcium carbonate slurry is obtained;

[0108] The surface treatment agent prepared in Preparation Example Four is uniformly mixed by ultrasonic stirring to obtain a surface treatment agent solution;

[0109] The surface treatment agent solution is added to the calcium carbonate slurry, and the mass ratio of the calcium carbonate slurry to the surface treatment agent solution is 16:1. The mixture is uniformly stirred by ultrasonic stirring, and coated for 1-1.5 hours to obtain a surface-modified calcium carbonate slurry;

[0110] The surface-modified calcium carbonate slurry is dried in a carbon dioxide gas atmosphere to obtain the light calcium carbonate.

[0111] The light calcium carbonate prepared in Examples 5-7 is tested for activation rate and specific surface area according to GB / T19281-2014 "Calcium Carbonate Analysis Method".

[0112] The oil absorption amount is tested according to the method described in GB / T19281-2003. The results are shown in Table 2.

[0113]

[0114] Table 2

[0115] From the detection results in the above Table 2, it can be seen that the detection results of Example 6 are better, at this time, the sodium hexametaphosphate, dipalmitoyl tartrate diester and polymethyl methacrylate components can not only be uniformly analyzed in the system, but also have excellent synergies, sodium hexametaphosphate adsorbs calcium carbonate, not only can significantly increase the absolute value of the surface potential of nano calcium carbonate, produce strong electrostatic repulsion effect, in addition, the strong space repulsion effect produced by the adsorption layer will also help the subsequent compatibility with the matrix, and sodium hexametaphosphate can effectively inhibit the agglomeration of fillers in water by enhancing the affinity of the filler surface to water, thereby effectively inhibiting the agglomeration of fillers in water, polymethyl methacrylate can form an extremely thin polymer film layer and be adsorbed on the surface of calcium carbonate, which helps to refine and homogenize the matrix crystal grains, thereby improving the impact resistance and tensile properties of the filler, one end of the dipalmitoyl tartrate diester is a long-chain alkyl group, which is good in compatibility with the polymer, and the other end of the RCOO- can form a chemical bond with the calcium ions on the surface of calcium carbonate, producing an active coating layer to prevent calcium carbonate particles from agglomerating, the compounding of sodium hexametaphosphate, dipalmitoyl tartrate diester and polymethyl methacrylate makes the surface of calcium carbonate particles have a low surface energy, and the calcium carbonate particles are not easy to agglomerate, forming a uniform and stable lipophilic hydrophobic coating layer, significantly improving the hydrophobicity and dispersibility of light calcium carbonate, and when used as a filler for rubber products, it can improve the heat resistance, strength and stiffness of the rubber product.

[0116] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. Process for the preparation of light calcium carbonate, characterized in that, It comprises the following steps: S1: grinding calcium oxide powder with grinding aids to obtain primary crushed particles, adding hot water to digest, then diluting with water, and preparing a calcium hydroxide suspension after uniform high-speed stirring; S2: passing carbon dioxide gas into the calcium hydroxide suspension, and performing under high-speed stirring, stopping passing carbon dioxide gas when the pH value of the system is 7-8, to obtain a calcium carbonate slurry; S3: mixing sodium hexametaphosphate, bis-palmitoyl tartaric acid diester, and polymethyl methacrylate according to a mass ratio of (1-5):(3-4):(2-7), heating, and uniformly mixing and stirring by ultrasonic waves to prepare a surface treatment agent solution; S4: adding the surface treatment agent solution to the calcium carbonate slurry, uniformly stirring by ultrasonic waves, and performing coating treatment for 1-1.5 h to obtain a surface-modified calcium carbonate slurry; S5: drying the surface-modified calcium carbonate slurry under a carbon dioxide gas atmosphere to obtain the light calcium carbonate; The particle size of the crushed particles is 20-38 um; The mass ratio of the calcium carbonate slurry to the surface treatment agent solution is (14-20):1; The grinding aid is a mixed solution of phosphate esters and ethanol.

2. The method of producing light calcium carbonate according to claim 1, characterized in that, The phosphate esters include one or more of fatty alcohol ether phosphates, phenol ether phosphates, lauryl phosphates, and isotridecanol phosphates.

3. The method of preparing light calcium carbonate according to claim 1, characterized in that: In step S2, the volume content of the passed carbon dioxide gas is 25-30%.

4. Light calcium carbonate, characterized in that: The light calcium carbonate obtained by the preparation method of any one of claims 1-3.

5. The light calcium carbonate of claim 4 for use in the field of fillers.

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