A phosphorus-based building gypsum reinforcing agent based on chip sludge and its preparation and application method

Abstract

This invention discloses a phosphorus-based building gypsum reinforcing agent based on chip sludge, comprising the following components by weight: 310-560 parts of chip sludge separation liquid, 3-15 parts of stearic acid, 10000-19860 parts of ionic liquid or organic solvent, 60-107 parts of amine modifier, 15-46 parts of iron salt solution, and 277-875 parts of water. The chip sludge separation liquid is obtained by adding water to chip sludge to form a slurry, then adding acid, a hydrogen-containing silicone oil emulsion, a surfactant, and an emulsifier, followed by heating and stirring, emulsification, settling, filtration, and collection of the filtrate. The phosphorus-based building gypsum reinforcing agent of this invention enables the resource utilization of various effective components in chip sludge, such as calcium fluoride and aluminum-containing components, resulting in significant economic and environmental benefits. Its application in reinforcing phosphogypsum products can achieve both good mechanical and waterproof properties, providing a new approach for the preparation of high-performance phosphogypsum products.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to a phosphorus-based building gypsum reinforcing agent based on chip sludge and its preparation and application methods. Background Technology

[0002] The main components of chip sludge include CaF2, SiO2, and CaCO3, while impurities mainly include Si, Na, and S, as well as other heavy metal impurities such as Fe, Cr, Cu, Ni, and Mn. Furthermore, the polyaluminum chloride (PAC) flocculant added during the wastewater flocculation and sedimentation process introduces Al impurities. Currently, the main approach to resource utilization of chip sludge involves using certain technologies to separate and classify calcium fluoride and other impurities. For example, patent CN112897562A discloses a method for purifying calcium fluoride from chip sludge. This method involves mixing and leaching acid and calcium fluoride sludge under high temperature and pressure, followed by filtration. The filter cake is washed until neutral, then reacted with an alkaline solution. The resulting filter cake is then calcined, or washed with an organic solvent to remove organic matter, yielding high-purity calcium fluoride. This process is simple and alleviates the shortage of fluorite resources, but it does not treat the chip sludge filtrate.

[0003] Phosphogypsum has a complex composition, with CaO and SO3 as its main chemical components, accounting for over 91%, along with small amounts of Al2O3, Fe2O3, and SiO2. Furthermore, phosphogypsum contains organic matter, fluorides, heavy metal ions, and trace amounts of radioactive elements, severely impacting its reuse. Its main phase structure is CaSO4·2H2O, accounting for over 80%, with small amounts of eutectic phosphorus (CaHPO4·2H2O) and SiO2. Additionally, some phosphogypsum contains impurities such as insoluble phosphorus (Ca3(PO4)2) and insoluble fluorine (CaSiF6, CaF2). Its main resource utilization pathways include road construction, cement retarder, gypsum board, and building gypsum; among these, building gypsum, due to its large usage and high added value, is an important direction for the utilization of phosphogypsum. Free phosphorus in phosphogypsum can prolong the setting time of phosphogypsum, reduce its strength, and cause it to have a loose structure, thus limiting its widespread application.

[0004] To address the aforementioned technical problems, the effective solidification of free phosphorus can be achieved by utilizing the reaction of aluminum ions, iron ions, and other metal ions with phosphate ions to form a precipitate. However, since the precipitation of phosphate ions with metal ions usually requires acidic conditions to occur effectively, and the precipitation typically occurs on the surface of phosphogypsum, it will prevent further hydration of the phosphogypsum, leading to a rapid decrease in strength. Summary of the Invention

[0005] The main objective of this invention is to address the problems and shortcomings of existing technologies by providing a phosphorus-based building gypsum reinforcing agent based on chip sludge, which enables the resource utilization of various effective components in chip sludge, such as calcium fluoride and aluminum-containing components. When applied to reinforcing phosphogypsum products, it can achieve both good mechanical and waterproof properties, providing a new approach for the preparation of high-performance phosphogypsum products.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A phosphorus-based building gypsum reinforcing agent based on chip sludge comprises the following components by weight: 310-560 parts of chip sludge separation liquid, 3-15 parts of stearic acid, 10000-19860 parts of ionic liquid or organic solvent, 60-107 parts of amine modifier, 15-46 parts of iron salt solution, and 277-875 parts of water; wherein the chip sludge separation liquid is obtained by adding water to chip sludge to make a slurry, then adding acid, hydrogen-containing silicone oil emulsion, surfactant, and emulsifier, heating and stirring, emulsifying, allowing to settle and precipitate, filtering, and collecting the filtrate.

[0008] In the above scheme, the pH value of the chip sludge separation liquid is 6.5~9.

[0009] In the above scheme, the concentration of the resulting chip sludge slurry is controlled to be 50~55wt% in the pulping step.

[0010] In the above scheme, the components introduced into the chip sludge separation liquid and their respective weight parts include: 285-487 parts of chip sludge, 10-15 parts of acid, 4-10 parts of surfactant, 10-28 parts of emulsifier, and 2-15 parts of hydrogen-containing silicone oil emulsion.

[0011] Furthermore, the acid solution can be hydrochloric acid, nitric acid, or acetic acid, with a concentration of 0.9~2.0 mol / L.

[0012] Preferably, the acid solution is hydrochloric acid with a concentration of 0.9~1.2 mol / L.

[0013] In the above scheme, the surfactant can be Tween, silane coupling agents, or aluminate surfactants, etc.

[0014] In the above scheme, the emulsifier can be Span, fatty acid glycerides, or polyoxyethylene fatty alcohol ethers, etc.

[0015] Preferably, the emulsifier comprises Span 80 (pH 5-8) and polyoxyethylene octylphenol ether-10 (pH 6-8); wherein the mass ratio of Span 80 to polyoxyethylene octylphenol ether-10 is 20:8-10.

[0016] In the above scheme, the main component of the hydrogen-containing silicone oil emulsion is hydrogen-containing polysiloxane, and its content is 0.5~1wt%.

[0017] In the above scheme, the iron salt solution can be FeCl3 solution or FeSO4 solution, etc.

[0018] Furthermore, the concentration of the iron salt solution is 40~45 mg / L.

[0019] In the above scheme, the heating and stirring are carried out at a temperature of 50~70 ℃ for 40~50 min, and the stirring rate is 400~660 r / min.

[0020] In the above scheme, the emulsification time is 20~40 min and the emulsification speed is 3000~4500 r / min.

[0021] In the above scheme, the settling time is 2-3 hours.

[0022] Furthermore, the resulting precipitate is mainly composed of calcium fluoride, with a purity of 65-80%. After flotation treatment, it can replace fluorite resources and alleviate the shortage of fluorite resources.

[0023] Furthermore, the mass ratio of the surfactant to the emulsifier is 12~18:28.

[0024] In the above scheme, the ionic liquid can be 1-butyl-3-methylimidazolium bromide, 1-ethyl-3-methylimidazolium, 1-propyl-3-methylpyridine, or triethylammonium phosphate, etc.; the organic solvent can be pinene or tetrabutylammonium fluoride.

[0025] In the above scheme, the amine modifier can be selected from dehydroabimethamine, 1,4-butanediamine, ethylenediamine, or heterocyclic aromatic amines, etc.

[0026] In the above scheme, the main chemical components and their contents in the chip sludge include: calcium fluoride 30~70%, aluminum-containing components 0.5~10%, silicon dioxide 5~20%, phosphate 7.10~27.60g / kg; its water content is 60~80%, and its pH value is 6.5~8.5.

[0027] The above-mentioned method for preparing a phosphorus-based building gypsum reinforcing agent based on chip sludge includes the following steps:

[0028] 1) Mix the chip sludge separation liquid with stearic acid and water, and stir to obtain solution A;

[0029] 2) Add some ionic liquid or organic solvent to the obtained solution A, stir well to obtain solution B; dissolve the amine modifier in the remaining ionic liquid or organic solvent, stir well to obtain solution C;

[0030] 3) Mix the obtained solution B with solution C, stir, then heat and stir pretreatment, and then heat reaction to obtain the phosphorus building gypsum reinforcing agent.

[0031] In the above scheme, the amount of stearic acid is 1 to 3% of the mass of phosphorus building gypsum.

[0032] In the above scheme, the stirring process in step 1) is carried out at a rate of 180~300 r / min for a time of 30~45 min.

[0033] In the above scheme, in step 2), the stirring speed for preparing solution B is 220~400 r / min and the time is 15~30 min; the stirring speed for preparing solution C is 300~500 r / min and the time is 40~50 min.

[0034] In the above scheme, the volume ratio of solution A to solvent in solution B is 1:20~50.

[0035] In the above scheme, in step 3), the stirring speed is 150~200 r / min and the time is 60~75min.

[0036] In the above scheme, in step 3), the temperature of the hot stirring pretreatment is 110~150 ℃, the time is 30~45 min, and the stirring speed is 180~320 r / min; the temperature of the heating reaction is 160~210 ℃, and the time is 1~5 h.

[0037] The present invention also provides a method for using the above-mentioned phosphorus building gypsum reinforcing agent, comprising the following steps: mixing the phosphorus building gypsum reinforcing agent and phosphorus building gypsum in a ratio of 1 to 10:50 and stirring for 2 to 3 minutes.

[0038] In the above scheme, the content of calcium sulfate hemihydrate in the phosphorus building gypsum is 65~70wt%, and the content of free phosphorus is 5~20wt%.

[0039] In the above scheme, the resulting reinforced phosphorus building gypsum has a compressive strength of 8-9 MPa, a softening coefficient of 0.85-0.95, and a water absorption rate of 16-17.4%; it has high compressive strength, softening coefficient, and low water absorption rate.

[0040] The principle of this invention is as follows:

[0041] The phosphorus-based building gypsum reinforcing agent of this invention uses chip sludge as the main raw material. After adding water to make a slurry, acid, hydrogen-containing silicone oil emulsion, surfactant, and emulsifier are added and heated and stirred to emulsify. After stirring, settling and collecting, the filtrate is collected to obtain chip sludge separation liquid. Then, by combining stearic acid, amine modifier, iron salt solution and other components, the phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared.

[0042] The aforementioned phosphorus-based building gypsum reinforcing agent is applied to enhance and modify phosphogypsum. The introduced amine modifier can promote the reaction between the aluminum-containing components in the chip sludge separation liquid and the free phosphorus in the phosphogypsum, mainly forming aluminum phosphate precipitate. This improves the water resistance of phosphogypsum and to some extent solves the problem of strength decline after gypsum hardens in a humid environment. At the same time, it can guide the aluminum phosphate precipitate to mainly coat the surface of the formed aluminum sulfate and aluminum hydroxide colloids (in small amounts), which helps to ensure the hydration process of phosphorus-based building gypsum and effectively increases the compressive strength and durability of the resulting phosphogypsum hydrated products.

[0043] By further combining stearic acid and silicone oil, their adsorption and desorption effects can be fully utilized to achieve selective adsorption of aluminum ions. In the later stage, it can also modify the hydrophobicity of phosphogypsum. Stearic acid can adhere to the surface of the pores and voids inside the hardened phosphogypsum body to form a hydrophobic layer. This structure works together with the low surface energy of stearic acid itself to give the material a strong hydrophobic surface. Hydrogen-containing silicone oil can form a network of hydrophobic film inside the material, reducing the water absorption rate of the material, thereby improving the softening coefficient of phosphogypsum.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] 1) This invention uses chip sludge as the main raw material and utilizes the obtained calcium fluoride-based precipitate and chip sludge separation liquid respectively, which can significantly improve the solid waste utilization rate of chip sludge and has significant economic and environmental benefits.

[0046] 2) This invention fully utilizes the aluminum-containing components in the chip sludge separation liquid, and under the promoting effect of amine modifiers, reacts with the free phosphorus in phosphogypsum to form aluminum phosphate precipitate, which can effectively ensure the hydration process of phosphogypsum, play a role in enhancing and waterproofing phosphogypsum, and achieve the purpose of treating waste with waste.

[0047] 3) The Fe introduced by the iron salt solution in the phosphorus-based building gypsum reinforcing agent of this invention 3+ It can react with free phosphorus in phosphogypsum to generate phosphate chemically bonded materials, and the resulting micro-nano iron phosphate particles have a curing effect on heavy metals; the formed phosphate materials have high compressive strength, and through chemical bonding and physical encapsulation, they can achieve stable curing of heavy metals, reduce environmental pollution, and have significant economic and environmental benefits.

[0048] 4) The preparation and application methods of the phosphorus-based building gypsum reinforcing agent described in this invention are relatively simple and easy to operate. It can effectively improve the mechanical properties and waterproof properties of phosphogypsum products and has wide applicability. Detailed Implementation

[0049] To more clearly and comprehensively demonstrate the advantages of the present invention, the following specific embodiments are provided for further detailed description. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the invention. After reading this invention, any modifications of the invention by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

[0050] In the following examples, the chip sludge used was taken from a chip manufacturing company in Shenzhen. Its water content was 71%, its pH value was 7.2, and its main chemical components and their mass percentages were: calcium fluoride, silicon dioxide, calcium carbonate, calcium oxide, and metal oxides. The main impurities were sulfur, phosphorus, chlorine, and various heavy metal elements. Its calcium fluoride content was 50-60%, its aluminum content was 0.5-5%, its silicon dioxide content was 10%, and its phosphate content was 9.4 g / kg. Its water content was 70%, and its pH value was 7.2.

[0051] The phosphorus-containing building gypsum used contains 65 wt% calcium sulfate hemihydrate and 5-20% free phosphorus.

[0052] Example 1

[0053] A phosphorus-based building gypsum reinforcing agent based on chip sludge comprises the following components by weight: 335 parts chip sludge separation liquid, 6 parts stearic acid, 11196 parts solvent (pinene), 65 parts amine modifier (dehydroabimethamine), 15 parts FeCl3 solution (concentration of 41 mg / L, the same below), and 388 parts water.

[0054] The chip sludge treatment method includes the following steps: 286 parts of chip sludge are added to a plastic beaker, water is added to adjust the slurry mass fraction to 50%, 11 parts of hydrochloric acid (0.9 mol / L, the same below), 6 parts of hydrogen-containing silicone oil emulsion (hydrogen-containing polysiloxane content of 0.7wt%), 5 parts of surfactant (Tween 80), and 10 parts of emulsifier (Span 80 and polyoxyethylene octylphenol ether-10 compounded at a mass ratio of 20:8) are added, and the temperature is controlled at 60 ℃. The mixture is stirred for 40 min at a stirring speed of 450 r / min to obtain solution A; solution A is emulsified using a high-shear Blue's emulsifier for 20 min at a stirring speed of 3000 min / r, and allowed to settle for 1.2 h to obtain solution B; the mixture is filtered to obtain chip sludge separation liquid (pH value of 8).

[0055] The specific preparation method of the phosphorus-based building gypsum reinforcing agent includes the following steps:

[0056] 1) The weighed chip sludge separation liquid was mixed with stearic acid and water, and stirred with a magnetic stirrer for 40 minutes at a stirring speed of 250 r / min to obtain solution A;

[0057] 2) Add a portion of the solvent pinene to the obtained solution A (318 parts of solution A, 11196 parts of pinene), and stir continuously for 20 min at a stirring speed of 300 r / min to obtain solution B; dissolve the amine modifier in the remaining amount of solvent pinene, stir until completely dissolved, and then stir continuously for 45 min at a stirring speed of 400 r / min to obtain solution C;

[0058] 3) Mix the obtained solution B with solution C and stir for 65 min at a stirring speed of 180 r / min. Then pour the mixture into a quartz tube, seal it, and place it in a reactor. Pre-stir at 120 °C for 40 min at a stirring speed of 245 r / min, and then react at 180 °C for 3 h to obtain the phosphorus building gypsum reinforcing agent.

[0059] Application examples

[0060] The obtained phosphorus-based building gypsum reinforcing agent was mixed with phosphorus-based building gypsum slurry (the concentration of phosphorus-based building gypsum was 25wt%) at a mass ratio of 5:50, stirred for 2 min, poured into molds, and naturally cured for 3-5 days to obtain phosphorus-based building gypsum specimens.

[0061] Example 2

[0062] A phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared in a manner largely similar to that of Example 1, except that the phosphorus-based building gypsum reinforcing agent comprises the following components by weight: 414 parts chip sludge separation liquid, 9 parts stearic acid, 13268 parts pinene, 76 parts amine modifier, 26 parts FeCl3 solution, and 453 parts water; and in the preparation of the chip sludge separation liquid, the raw materials and their respective weight proportions are: 350 parts chip sludge, 13 parts hydrochloric acid, 8 parts surfactant, 12 parts emulsifier, and 8 parts hydrogen-containing silicone oil emulsion.

[0063] During application, the concentration of phosphorus gypsum in the phosphorus-containing building gypsum slurry is 18%.

[0064] Example 3

[0065] A phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared and applied in a manner largely similar to that of Example 1, except that the phosphorus-based building gypsum reinforcing agent comprises the following components by weight: 505 parts chip sludge separation liquid, 7 parts stearic acid, 13268 parts 1-ethyl-3-methylimidazole, 88 parts amine modifier, 30 parts FeCl3 solution, and 490 parts water; and in the preparation of the chip sludge separation liquid, the raw materials and their respective weight proportions are: 410 parts chip sludge, 15 parts hydrochloric acid, 8 parts surfactant, 18 parts emulsifier, and 8 parts hydrogen-containing silicone oil emulsion.

[0066] During application, the concentration of phosphorus gypsum in the phosphorus building gypsum slurry is 25%.

[0067] Example 4

[0068] A phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared and applied in a manner largely similar to that of Example 1, except that the phosphorus-based building gypsum reinforcing agent comprises the following components by weight: 535 parts chip sludge separation liquid, 15 parts stearic acid, 13268 parts pinene, 99 parts amine modifier, 45 parts FeCl3 solution, and 589 parts water; and in the preparation of the chip sludge separation liquid, the raw materials and their respective weight proportions are: 466 parts chip sludge, 12 parts hydrochloric acid, 10 parts surfactant, 22 parts emulsifier, and 10 parts hydrogen-containing silicone oil emulsion.

[0069] The concentration of phosphorus gypsum in the phosphorus building gypsum slurry is 25%.

[0070] Example 5

[0071] A phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared in a manner largely similar to that of Example 1, except that the phosphorus-based building gypsum reinforcing agent comprises the following components by weight: 459 parts chip sludge separation liquid, 5 parts stearic acid, 13268 parts pinene, 89 parts amine modifier, 30 parts FeCl3 solution, and 600 parts water; and in the preparation of the chip sludge separation liquid, the raw materials and their respective weight proportions are: 446 parts chip sludge, 10 parts hydrochloric acid, 10 parts surfactant, 15 parts emulsifier, and 3 parts hydrogen-containing silicone oil emulsion.

[0072] The concentration of phosphorus gypsum in the phosphorus building gypsum slurry is 25%.

[0073] Example 6

[0074] A phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared and applied in a manner largely similar to that of Example 1, except that the phosphorus-based building gypsum reinforcing agent comprises the following components by weight: 430 parts chip sludge separation liquid, 9 parts stearic acid, 13268 parts pinene, 75 parts amine modifier, 40 parts FeCl3 solution, and 587 parts water; and in the preparation of the chip sludge separation liquid, the raw materials and their respective weight proportions are: 310 parts chip sludge, 15 parts hydrochloric acid, 8 parts surfactant, 18 parts emulsifier, and 9 parts hydrogen-containing silicone oil emulsion.

[0075] The concentration of phosphorus gypsum in the phosphorus building gypsum slurry is 25%.

[0076] Comparative Example 1

[0077] A phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared and applied in a manner similar to that of Example 4, except that 8 parts of surfactant, 18 parts of emulsifier, and 8 parts of hydrogen-containing silicone oil emulsion are replaced with 34 parts of water.

[0078] Comparative Example 2

[0079] A phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared and applied in a manner similar to that of Example 4, except that 99 parts of amine modifier are replaced with 99 parts of water.

[0080] Comparative Example 3

[0081] A phosphorus-based building gypsum reinforcing agent based on chip sludge is prepared and applied in a manner largely the same as in Example 4, except that the phosphorus-based building gypsum reinforcing agent comprises the following components by weight: 15 parts stearic acid, 13268 parts pinene, 99 parts amine modifier, 45 parts FeCl3 solution, 589 parts water, 12 parts hydrochloric acid, 10 parts surfactant, 22 parts emulsifier, and 10 parts hydrogen-containing silicone oil emulsion.

[0082] Table 1. Performance test results of phosphorus-based building gypsum specimens obtained in Examples 1-6 and Comparative Examples 1-3.

[0083]

[0084] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A phosphorus-based building gypsum reinforcing agent based on chip sludge, characterized in that, The components, by weight, are as follows: 310-560 parts of chip sludge separation liquid, 3-15 parts of stearic acid, 10,000-19,860 parts of ionic liquid or organic solvent, 60-107 parts of amine modifier, 15-46 parts of iron salt solution, and 277-875 parts of water; wherein the chip sludge separation liquid is obtained by adding water to chip sludge to make a slurry, then adding acid, hydrogen-containing silicone oil emulsion, surfactant, and emulsifier, heating and stirring, emulsifying, allowing it to settle, filtering, and collecting the filtrate; The components introduced into the chip sludge separation liquid and their respective weight percentages include: 285-487 parts chip sludge, 10-15 parts acid, 4-10 parts surfactant, 10-28 parts emulsifier, and 2-15 parts hydrogen-containing silicone oil emulsion. The main chemical components and their contents in the chip sludge include: calcium fluoride 30-70%, aluminum-containing components 0.5-10%, silicon dioxide 5-20%, and phosphate 7.10-27.60 g / kg; its water content is 60-80%, and its pH value is 6.5-8.

5.

2. The phosphorus-based building gypsum reinforcing agent according to claim 1, characterized in that, The acid solution is hydrochloric acid, nitric acid, or acetic acid, with a concentration of 0.9~2.0 mol / L; the surfactant is Tween, silane coupling agent, or aluminate surfactant; the emulsifier is Span, fatty acid glyceride, or polyoxyethylene fatty alcohol ether.

3. The phosphorus-based building gypsum reinforcing agent according to claim 1, characterized in that, The main component of the hydrogen-containing silicone oil emulsion is hydrogen-containing polysiloxane, with a concentration of 0.5~1wt%.

4. The phosphorus-based building gypsum reinforcing agent according to claim 1, characterized in that, The ionic liquid is 1-butyl-3-methylimidazolium bromide, 1-ethyl-3-methylimidazolium, 1-propyl-3-methylpyridine, or triethylammonium phosphate; the organic solvent is pinene or tetrabutylammonium fluoride.

5. The phosphorus-based building gypsum reinforcing agent according to claim 1, characterized in that, The amine modifier is dehydroabimethamine, 1,4-butanediamine, ethylenediamine, or heterocyclic aromatic amine.

6. The method for preparing the phosphorus-based building gypsum reinforcing agent based on chip sludge as described in claim 1, characterized in that, Includes the following steps: 1) Mix the chip sludge separation liquid with stearic acid and water, and stir to obtain solution A; 2) Add some ionic liquid or organic solvent to the obtained solution A, stir well to obtain solution B; dissolve the amine modifier in the remaining ionic liquid or organic solvent, stir well to obtain solution C; 3) Mix the obtained solution B with solution C, stir, then heat and stir pretreatment, and then heat reaction to obtain the phosphorus building gypsum reinforcing agent.

7. The preparation method according to claim 6, characterized in that, In step 3), the temperature for heating and stirring pretreatment is 110~150 ℃ and the time is 30~45 min; the temperature for heating reaction is 160~210 ℃ and the time is 1~5 h.

8. The method of using the phosphorus-based building gypsum reinforcing agent based on chip sludge according to any one of claims 1 to 5, or the phosphorus-based building gypsum reinforcing agent based on chip sludge obtained by the preparation method according to any one of claims 6 to 7, characterized in that, The process includes the following steps: mixing phosphorus-based building gypsum reinforcing agent with phosphorus-based building gypsum at a mass ratio of 1 to 10:50 and stirring.

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