Preparation method of white sulphoaluminate cement

Abstract

The invention discloses a preparation method of white sulphoaluminate cement, which specifically comprises the following steps: S1, ingredient treatment, S2, fly ash treatment, S3, mixed powder preparation, S4, acidification reaction treatment, S5, water absorption mixing treatment, and S6, evaporation calcination treatment, and relates to the technical field of building materials. According to the preparation method of the white sulphoaluminate cement, the anti-freezing effect of the cement can be greatly improved by adding the filler compound, the fly ash, the water absorption compound and the anti-freezing composition into a cement formula, and the freezing resistance of the sulphoaluminate cement prepared by the preparation method of the sulphoaluminate cement is well improved; the purpose that the strength of the cement is guaranteed and the anti-freezing effect of the cement can be remarkably improved is achieved, meanwhile, materials are fully smashed in a feeding mode of evenly scattering the materials in batches, the cement can be fully mixed during mixing, gaps between powder particles are reduced, and therefore the sulphoaluminate cement can be widely applied.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to a method for preparing white sulphoaluminate cement. Background Art

[0002] Cement includes Portland cement, ordinary Portland cement, slag Portland cement, pozzolana Portland cement and fly ash Portland cement. Special cement includes oil well cement, dam cement, rapid hardening cement, anti-sulfate cement and white cement, etc. The main feature of the Portland cement series is that the clinker mineral composition is mainly C3S, which determines the basic properties of Portland cement, such as the law of strength development. Portland cement is the most important adhesive structural material for construction in the world today.

[0003] Referring to a method for preparing sulphoaluminate cement with Chinese patent publication number CN108147687A, by adding a coagulant and a water reducing agent, the early strength of cement, especially the strength of three hours or four hours, is improved, the demoulding time of cement is shortened, and the construction production efficiency is improved. By adding sodium hydroxide to the cement clinker to bring in an appropriate amount of alkali content, the early hydration rate of the clinker is accelerated, and the early strength of the cement is further improved. By adding iron oxide to the cement clinker to bring in a small amount of iron ions, the clinker calcination temperature is lowered, reducing the heat consumption during the clinker calcination process.

[0004] Referring to the preparation method of a sulphoaluminate cement board with Chinese patent publication number CN105731940A, the sulphoaluminate cement board prepared by the preparation method of the present invention has a reasonable formula and is easy to use. After performance testing, the board of the present invention meets the relevant national standards. It has good impact resistance, good strength, short curing time, and improved production efficiency. The preparation method of the cement board of the present invention is simple, easy to operate, and easy to master.

[0005] The sulphoaluminate cement prepared by the existing preparation method of sulphoaluminate cement has poor frost resistance. The frost resistance is poor only by adding antifreeze agents. It is impossible to greatly improve the frost resistance of cement by adding filler composites, fly ash, water-absorbing composites and antifreeze compositions into the cement formula, and it is impossible to achieve the purpose of both ensuring the strength of cement and significantly improving the frost resistance of cement. At the same time, it is impossible to fully crush the materials by adopting a feeding method of uniformly spreading materials in batches, so that the cement can be fully mixed during mixing and the gaps between each powder particle can be reduced, which is very unfavorable for the widespread use of sulphoaluminate cement. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a method for preparing white sulphoaluminate cement, which solves the problem that the sulphoaluminate cement prepared by the prior method for preparing sulphoaluminate cement has poor frost resistance. The frost resistance is poor only by adding antifreeze agents, and it is not possible to greatly improve the frost resistance of cement by adding filler composites, fly ash, water-absorbing composites and antifreeze compositions into the cement formula, and it is not possible to achieve the purpose of both ensuring the strength of cement and significantly improving the frost resistance of cement. At the same time, it is not possible to achieve the problem of fully crushing the materials by adopting a feeding method of evenly spreading the materials in batches, so that the cement can be fully mixed during mixing and the gaps between each powder particle can be reduced.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented by the following technical scheme: a method for preparing white sulphoaluminate cement, specifically comprising the following steps:

[0010] S1. Batching process: 20-30 parts of white sulphoaluminate cement clinker, 5-10 parts of white Portland cement clinker, 5-10 parts of filler compound, 10-20 parts of gypsum, 5-10 parts of fly ash, 5-10 parts of water-absorbing compound, 5-10 parts of antifreeze composition, 3-5 parts of retarder and 3-5 parts of water reducing agent are measured by weighing equipment respectively, and stored by storage equipment for standby use;

[0011] S2, fly ash treatment: add the fly ash weighed in step S1 into an extraction device, add acid solution, and mix and react for 1-2 hours to obtain aluminum residue and crude liquid containing aluminum salt;

[0012] S3, preparation of mixed powder: the white sulphoaluminate cement clinker, white silicate cement clinker, filler compound and gypsum weighed in step S1 are first stirred and mixed by a mixing device to obtain a mixed material, and then the mixed material is put into a grinding device by evenly spreading the material, and the mixed material is grinded in batches, and then passed through a 100-200 mesh sieve to finally obtain a mixed powder;

[0013] S4, acidification reaction treatment: pour the mixed powder obtained in step S2 into a reactor, then add the crude liquid obtained in step S2 into the reactor, and then carry out acid dissolution reaction, the acid dissolution reaction temperature is 16-20° C., the acid dissolution reaction time is 1-2h, and a product slurry is obtained;

[0014] S5, water absorption and mixing treatment: the antifreeze composition, retarder and water reducer weighed in step S1 are sequentially added to the product slurry obtained in step S4, and mixed and stirred at a speed of 500-600 r / min for 20-30 min by a mixing device to obtain a composite material, and then the water-absorbing composite weighed in step S1 is blended into the composite material and continuously mixed at 800-1000 r / min for 1-2 h, so that the water in the composite material is fully absorbed by the water-absorbing composite material, and mixed into a composite slurry with the required water content;

[0015] S6, evaporation and calcination treatment: the composite slurry obtained in step S5 is evaporated and crystallized at a temperature of 100-130°C and a pressure of -0.1MPa to -0.01MPa to obtain mixed crystals, and then the mixed crystals are calcined at a temperature of 1200-1400°C to obtain sulphoaluminate cement clinker, which is then cooled and packaged to obtain white sulphoaluminate cement.

[0016] Preferably, the raw materials of the white sulphoaluminate cement weighed in step S1 include, by weight: 25 parts of white sulphoaluminate cement clinker, 7 parts of white Portland cement clinker, 7 parts of filler compound, 15 parts of gypsum, 7 parts of fly ash, 7 parts of water-absorbing compound, 7 parts of antifreeze composition, 4 parts of retarder and 4 parts of water reducer.

[0017] Preferably, the raw materials of the white sulphoaluminate cement weighed in step S1 include, by weight: 20 parts of white sulphoaluminate cement clinker, 5 parts of white Portland cement clinker, 5 parts of filler compound, 10 parts of gypsum, 5 parts of fly ash, 5 parts of water-absorbing compound, 5 parts of antifreeze composition, 3 parts of retarder and 3 parts of water reducer.

[0018] Preferably, the raw materials of the white sulphoaluminate cement weighed in step S1 include, by weight: 30 parts of white sulphoaluminate cement clinker, 10 parts of white Portland cement clinker, 10 parts of filler compound, 20 parts of gypsum, 10 parts of fly ash, 10 parts of water-absorbing compound, 10 parts of antifreeze composition, 5 parts of retarder and 5 parts of water reducer.

[0019] Preferably, the water-absorbing composite is a spherical composite with holes formed by polymerization of calcium alginate and epoxy resin.

[0020] Preferably, the filler composite is a combination of one or more of boron slag, limestone and slag.

[0021] Preferably, the antifreeze composition is a mixture of sodium nitrate, calcium lignin sulfonate and sodium chloride.

[0022] Preferably, the retarder is a combination of one or more of lignin sulfonate, molasses, sodium dihydrogen phosphate, sodium tripolyphosphate, metasilicate gypsum or hydrated thermal gypsum.

[0023] Preferably, the water reducing agent is one of vinyl acetate and ethylene copolymer rubber powder, polypropylene oxide, fatty acid potassium soap, acrylic acid, melamine formaldehyde resin or hydrogen peroxide.

[0024] Preferably, the uniform spreading and feeding in step S3 is achieved by using a moving mechanism to drive the lower hopper to move horizontally at a uniform speed, so that the lower hopper moves at a uniform speed above the feed inlet of the grinding equipment, and a solenoid valve is provided at the bottom of the lower hopper, and the opening and closing of the solenoid valve can be controlled by a controller.

[0025] (III) Beneficial effects

[0026] The present invention provides a method for preparing white sulphoaluminate cement. Compared with the prior art, the method has the following beneficial effects: the method for preparing white sulphoaluminate cement can greatly improve the antifreeze effect of cement by adding filler composites, fly ash, water-absorbing composites and antifreeze compositions into the cement formula, and greatly improve the antifreeze property of sulphoaluminate cement prepared by the method for preparing sulphoaluminate cement, achieving the purpose of both ensuring the strength of cement and significantly improving the antifreeze effect of cement, and at the same time, by adopting a feeding method of evenly spreading materials in batches to fully crush the materials, the cement can be fully mixed during mixing, and the gaps between each powder particle are reduced, thereby facilitating the widespread use of sulphoaluminate cement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a flow chart of the preparation method. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 The embodiment of the present invention provides three technical solutions: a method for preparing white sulphoaluminate cement, specifically including the following embodiments:

[0030] Example 1

[0031] A method for preparing white sulphoaluminate cement specifically comprises the following steps:

[0032] S1. Batching process: 25 parts of white sulphoaluminate cement clinker, 7 parts of white silicate cement clinker, 7 parts of filler compound, 15 parts of gypsum, 7 parts of fly ash, 7 parts of water-absorbing compound, 7 parts of antifreeze composition, 4 parts of retarder and 4 parts of water reducer are measured by weighing equipment respectively, and stored by storage equipment for standby use. The water-absorbing compound is a spherical composite with holes formed by polymerization of calcium alginate and epoxy resin, the filler compound is a composition of one or more of boric slag, limestone and slag, the antifreeze composition is a mixture of sodium nitrate, calcium lignin sulfonate and sodium chloride, the retarder is a composition of one or more of lignin sulfonate, molasses, sodium dihydrogen phosphate, sodium tripolyphosphate, metasilicate gypsum or hydrated hot gypsum, and the water reducer is one of vinyl acetate and ethylene copolymer rubber powder, polypropylene oxide, fatty acid potassium soap, acrylic acid, melamine formaldehyde resin or hydrogen peroxide;

[0033] S2, fly ash treatment: add the fly ash weighed in step S1 into an extraction device, add acid solution, and mix and react for 1-2 hours to obtain aluminum residue and crude liquid containing aluminum salt;

[0034] S3, preparation of mixed powder: the white sulphoaluminate cement clinker, white silicate cement clinker, filler compound and gypsum weighed in step S1 are first stirred and mixed by a mixing device to obtain a mixed material, and then the mixed material is put into a grinding device by uniformly spreading the material, and the mixed material is ground in batches, and then passed through a 100-200 mesh sieve to finally obtain a mixed powder. The uniform spreading and feeding is achieved by using a moving mechanism to drive the lower hopper to move horizontally at a uniform speed, so that the lower hopper moves at a uniform speed above the feed port of the grinding device, and a solenoid valve is provided at the bottom of the lower hopper, and the opening and closing of the solenoid valve can be controlled by a controller;

[0035] S4, acidification reaction treatment: pour the mixed powder obtained in step S2 into a reactor, then add the crude liquid obtained in step S2 into the reactor, and then carry out acid dissolution reaction, the acid dissolution reaction temperature is 16-20° C., the acid dissolution reaction time is 1-2h, and a product slurry is obtained;

[0036] S5, water absorption and mixing treatment: the antifreeze composition, retarder and water reducer weighed in step S1 are sequentially added to the product slurry obtained in step S4, and mixed and stirred at a speed of 500-600 r / min for 20-30 min by a mixing device to obtain a composite material, and then the water-absorbing composite weighed in step S1 is blended into the composite material and continuously mixed at 800-1000 r / min for 1-2 h, so that the water in the composite material is fully absorbed by the water-absorbing composite material, and mixed into a composite slurry with the required water content;

[0037] S6, evaporation and calcination treatment: the composite slurry obtained in step S5 is evaporated and crystallized at a temperature of 100-130°C and a pressure of -0.1MPa to -0.01MPa to obtain mixed crystals, and then the mixed crystals are calcined at a temperature of 1200-1400°C to obtain sulphoaluminate cement clinker, which is then cooled and packaged to obtain white sulphoaluminate cement.

[0038] Example 2

[0039] A method for preparing white sulphoaluminate cement specifically comprises the following steps:

[0040] S1. Batching process: 20 parts of white sulphoaluminate cement clinker, 5 parts of white silicate cement clinker, 5 parts of filler compound, 10 parts of gypsum, 5 parts of fly ash, 5 parts of water-absorbing compound, 5 parts of antifreeze composition, 3 parts of retarder and 3 parts of water reducer are measured by weighing equipment respectively, and stored by storage equipment for standby use. The water-absorbing compound is a spherical composite with holes formed by polymerization of calcium alginate and epoxy resin, the filler compound is a composition of one or more of boric slag, limestone and slag, the antifreeze composition is a mixture of sodium nitrate, calcium lignin sulfonate and sodium chloride, the retarder is a composition of one or more of lignin sulfonate, molasses, sodium dihydrogen phosphate, sodium tripolyphosphate, metasilicate gypsum or hydrated hot gypsum, and the water reducer is one of vinyl acetate and ethylene copolymer rubber powder, polypropylene oxide, fatty acid potassium soap, acrylic acid, melamine formaldehyde resin or hydrogen peroxide;

[0041] S2, fly ash treatment: add the fly ash weighed in step S1 into an extraction device, add acid solution, and mix and react for 1-2 hours to obtain aluminum residue and crude liquid containing aluminum salt;

[0042] S3, preparation of mixed powder: the white sulphoaluminate cement clinker, white silicate cement clinker, filler compound and gypsum weighed in step S1 are first stirred and mixed by a mixing device to obtain a mixed material, and then the mixed material is put into a grinding device by uniformly spreading the material, and the mixed material is ground in batches, and then passed through a 100-200 mesh sieve to finally obtain a mixed powder. The uniform spreading and feeding is achieved by using a moving mechanism to drive the lower hopper to move horizontally at a uniform speed, so that the lower hopper moves at a uniform speed above the feed port of the grinding device, and a solenoid valve is provided at the bottom of the lower hopper, and the opening and closing of the solenoid valve can be controlled by a controller;

[0043] S4, acidification reaction treatment: pour the mixed powder obtained in step S2 into a reactor, then add the crude liquid obtained in step S2 into the reactor, and then carry out acid dissolution reaction, the acid dissolution reaction temperature is 16-20° C., the acid dissolution reaction time is 1-2h, and a product slurry is obtained;

[0044] S5, water absorption and mixing treatment: the antifreeze composition, retarder and water reducer weighed in step S1 are sequentially added to the product slurry obtained in step S4, and mixed and stirred at a speed of 500-600 r / min for 20-30 min by a mixing device to obtain a composite material, and then the water-absorbing composite weighed in step S1 is blended into the composite material and continuously mixed at 800-1000 r / min for 1-2 h, so that the water in the composite material is fully absorbed by the water-absorbing composite material, and mixed into a composite slurry with the required water content;

[0045] S6, evaporation and calcination treatment: the composite slurry obtained in step S5 is evaporated and crystallized at a temperature of 100-130°C and a pressure of -0.1MPa to -0.01MPa to obtain mixed crystals, and then the mixed crystals are calcined at a temperature of 1200-1400°C to obtain sulphoaluminate cement clinker, which is then cooled and packaged to obtain white sulphoaluminate cement.

[0046] Example 3

[0047] A method for preparing white sulphoaluminate cement specifically comprises the following steps:

[0048] S1. Batching process: 30 parts of white sulphoaluminate cement clinker, 10 parts of white silicate cement clinker, 10 parts of filler compound, 20 parts of gypsum, 10 parts of fly ash, 10 parts of water-absorbing compound, 10 parts of antifreeze composition, 5 parts of retarder and 5 parts of water reducer are measured by weighing equipment respectively, and stored by storage equipment for standby use. The water-absorbing compound is a spherical composite with holes formed by polymerization of calcium alginate and epoxy resin, the filler compound is a composition of one or more of boric slag, limestone and slag, the antifreeze composition is a mixture of sodium nitrate, calcium lignin sulfonate and sodium chloride, the retarder is a composition of one or more of lignin sulfonate, molasses, sodium dihydrogen phosphate, sodium tripolyphosphate, metasilicate gypsum or hydrated hot gypsum, and the water reducer is one of vinyl acetate and ethylene copolymer rubber powder, polypropylene oxide, fatty acid potassium soap, acrylic acid, melamine formaldehyde resin or hydrogen peroxide;

[0049] S2, fly ash treatment: add the fly ash weighed in step S1 into an extraction device, add acid solution, and mix and react for 1-2 hours to obtain aluminum residue and crude liquid containing aluminum salt;

[0050] S3, preparation of mixed powder: the white sulphoaluminate cement clinker, white silicate cement clinker, filler compound and gypsum weighed in step S1 are first stirred and mixed by a mixing device to obtain a mixed material, and then the mixed material is put into a grinding device by uniformly spreading the material, and the mixed material is ground in batches, and then passed through a 100-200 mesh sieve to finally obtain a mixed powder. The uniform spreading and feeding is achieved by using a moving mechanism to drive the lower hopper to move horizontally at a uniform speed, so that the lower hopper moves at a uniform speed above the feed port of the grinding device, and a solenoid valve is provided at the bottom of the lower hopper, and the opening and closing of the solenoid valve can be controlled by a controller;

[0051] S4, acidification reaction treatment: pour the mixed powder obtained in step S2 into a reactor, then add the crude liquid obtained in step S2 into the reactor, and then carry out acid dissolution reaction, the acid dissolution reaction temperature is 16-20° C., the acid dissolution reaction time is 1-2h, and a product slurry is obtained;

[0052] S5, water absorption and mixing treatment: the antifreeze composition, retarder and water reducer weighed in step S1 are sequentially added to the product slurry obtained in step S4, and mixed and stirred at a speed of 500-600 r / min for 20-30 min by a mixing device to obtain a composite material, and then the water-absorbing composite weighed in step S1 is blended into the composite material and continuously mixed at 800-1000 r / min for 1-2 h, so that the water in the composite material is fully absorbed by the water-absorbing composite material, and mixed into a composite slurry with the required water content;

[0053] S6, evaporation and calcination treatment: the composite slurry obtained in step S5 is evaporated and crystallized at a temperature of 100-130°C and a pressure of -0.1MPa to -0.01MPa to obtain mixed crystals, and then the mixed crystals are calcined at a temperature of 1200-1400°C to obtain sulphoaluminate cement clinker, which is then cooled and packaged to obtain white sulphoaluminate cement.

[0054] Application Examples

[0055] The specific application example of the present invention comprises the following steps:

[0056] Step 1: crush the white sulphoaluminate cement prepared by the preparation method of Examples 1-3 of the present invention into pieces less than 30 mm using a crusher.

[0057] Step 2: Determine the clinker rate of the white sulphoaluminate cement in step 1 through a burnability test, specifically: saturation ratio KH = 0.91 ± 0.02, silicon ratio SM = 2.50 ± 0.1, aluminum ratio IM = 1.50 ± 0.1.

[0058] The chemical composition of white sulphoaluminate cement clinker is shown in Table 1.

[0059] Table 1 Chemical composition

[0060]

[0061] Afterwards, the white sulphoaluminate cement prepared by the preparation methods of Examples 1-3 of the present invention in the above application examples were marked as Group A, Group B and Group C respectively, and conventional white sulphoaluminate cement on the existing market was selected as the control group, i.e. Group D. Then, antifreeze experiments were carried out respectively, and the cements of Groups A, B, C and D were placed in experimental cabins under the same temperature conditions, and cold air of the same temperature of -30°C to -15°C was blown to the cements. After three to four weeks, the changes of the cements in each group were observed. The specific experimental results are shown in Table 2.

[0062] Table 2 Antifreeze test analysis table

[0063]

[0064]

[0065] As can be seen from Table 2, the frost resistance of the white sulphoaluminate cement of Example 1 of the present invention is the best, and the frost resistance of the white sulphoaluminate cement prepared by Examples 1-3 of the present invention is better than that of the existing cement. Therefore, the present invention can greatly improve the frost resistance of cement by adding filler composites, fly ash, water-absorbing composites and antifreeze compositions to the cement formula, and greatly improve the frost resistance of the sulphoaluminate cement prepared by the preparation method of sulphoaluminate cement, achieving the purpose of both ensuring the strength of cement and significantly improving the frost resistance of cement. At the same time, by adopting a feeding method of evenly spreading materials in batches to fully crush the materials, the cement can be fully mixed during mixing, and the gaps between each powder particle are reduced, which is conducive to the widespread use of sulphoaluminate cement.

[0066] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0067] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0068] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing white sulphoaluminate cement, Features: The specific steps include: S1. Batching process: 20-30 parts of white sulphoaluminate cement clinker, 5-10 parts of white Portland cement clinker, 5-10 parts of filler compound, 10-20 parts of gypsum, 5-10 parts of fly ash, 5-10 parts of water-absorbing compound, 5-10 parts of antifreeze composition, 3-5 parts of retarder and 3-5 parts of water reducing agent are measured by weighing equipment respectively, and stored by storage equipment for standby use; S2, fly ash treatment: add the fly ash weighed in step S1 into an extraction device, add acid solution, and mix and react for 1-2 hours to obtain aluminum residue and crude liquid containing aluminum salt; S3, preparation of mixed powder: the white sulphoaluminate cement clinker, white silicate cement clinker, filler compound and gypsum weighed in step S1 are first stirred and mixed by a mixing device to obtain a mixed material, and then the mixed material is put into a grinding device by evenly spreading the material, and the mixed material is grinded in batches, and then passed through a 100-200 mesh sieve to finally obtain a mixed powder; S4, acidification reaction treatment: pour the mixed powder obtained in step S2 into a reactor, then add the crude liquid obtained in step S2 into the reactor, and then carry out acid dissolution reaction, the acid dissolution reaction temperature is 16-20° C., the acid dissolution reaction time is 1-2h, and a product slurry is obtained; S5, water absorption and mixing treatment: the antifreeze composition, retarder and water reducer weighed in step S1 are sequentially added to the product slurry obtained in step S4, and mixed and stirred at a speed of 500-600 r / min for 20-30 min by a mixing device to obtain a composite material, and then the water-absorbing composite weighed in step S1 is blended into the composite material and continuously mixed at 800-1000 r / min for 1-2 h, so that the water in the composite material is fully absorbed by the water-absorbing composite material, and mixed into a composite slurry with the required water content; S6, evaporation and calcination treatment: the composite slurry obtained in step S5 is evaporated and crystallized at a temperature of 100-130°C and a pressure of -0.1MPa to -0.01MPa to obtain mixed crystals, and then the mixed crystals are calcined at a temperature of 1200-1400°C to obtain sulphoaluminate cement clinker, which is then cooled and packaged to obtain white sulphoaluminate cement.

2. A method for preparing white sulphoaluminate cement according to claim 1, Features: The raw materials of the white sulphoaluminate cement weighed in step S1 include, by weight: 25 parts of white sulphoaluminate cement clinker, 7 parts of white Portland cement clinker, 7 parts of filler compound, 15 parts of gypsum, 7 parts of fly ash, 7 parts of water-absorbing compound, 7 parts of antifreeze composition, 4 parts of retarder and 4 parts of water reducing agent.

3. A method for preparing white sulphoaluminate cement according to claim 1, Features: The raw materials of the white sulphoaluminate cement weighed in the step S1 include, by weight: 20 parts of white sulphoaluminate cement clinker, 5 parts of white silicate cement clinker, 5 parts of filler compound, 10 parts of gypsum, 5 parts of fly ash, 5 parts of water-absorbing compound, 5 parts of antifreeze composition, 3 parts of retarder and 3 parts of water reducer.

4. A method for preparing white sulphoaluminate cement according to claim 1, Features: The raw materials of the white sulphoaluminate cement weighed in step S1 include, by weight: 30 parts of white sulphoaluminate cement clinker, 10 parts of white Portland cement clinker, 10 parts of filler compound, 20 parts of gypsum, 10 parts of fly ash, 10 parts of water-absorbing compound, 10 parts of antifreeze composition, 5 parts of retarder and 5 parts of water reducer.

5. A method for preparing white sulphoaluminate cement according to any one of claims 1 to 4, Features: The water-absorbing composite is a spherical composite with holes formed by polymerization of calcium alginate and epoxy resin.

6. A method for preparing white sulphoaluminate cement according to any one of claims 1 to 4, Features: The filler composite is a combination of one or more of boron slag, limestone and slag.

7. A method for preparing white sulphoaluminate cement according to any one of claims 1 to 4, Features: The antifreeze composition is a mixture of sodium nitrate, calcium lignin sulfonate and sodium chloride.

8. A method for preparing white sulphoaluminate cement according to any one of claims 1 to 4, Features: The retarder is a combination of one or more of lignin sulfonate, molasses, sodium dihydrogen phosphate, sodium tripolyphosphate, metasilicate gypsum or hydrated hot gypsum.

9. A method for preparing white sulphoaluminate cement according to any one of claims 1 to 4, Features: The water reducing agent is one of vinyl acetate and ethylene copolymer rubber powder, polypropylene oxide, fatty acid potassium soap, acrylic acid, melamine formaldehyde resin or hydrogen peroxide.

10. The method for preparing white sulphoaluminate cement according to claim 1, Features: In step S3, the uniform spreading and feeding of materials is performed by using a moving mechanism to drive the lower hopper to move horizontally at a uniform speed, so that the lower hopper moves at a uniform speed above the feed port of the grinding equipment, and a solenoid valve is provided at the bottom of the lower hopper, and the opening and closing of the solenoid valve can be controlled by a controller.

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