Phosphorus building gypsum reinforcing agent based on chip sludge as well as preparation method and use method of phosphorus building gypsum reinforcing agent

Abstract

The invention discloses a phosphorus building gypsum reinforcing agent based on chip sludge. The phosphorus building gypsum reinforcing agent is prepared from the following components in parts by weight: 310 to 560 parts of chip sludge separation liquid, 3 to 15 parts of stearic acid, 10000 to 19860 parts of ionic liquid or organic solvent, 60 to 107 parts of amine modifier, 15 to 46 parts of ferric salt solution and 277 to 875 parts of water, wherein the chip sludge separation liquid is obtained by adding water into chip sludge to prepare slurry, then adding acid liquor, hydrogen-containing silicone oil emulsion, a surfactant and an emulsifier, heating, stirring, emulsifying, standing, precipitating, filtering and collecting filtrate. According to the phosphorus building gypsum reinforcing agent, resource utilization of various effective components such as calcium fluoride and aluminum-containing components in chip sludge can be achieved, and remarkable economic and environmental benefits are achieved; when being applied to the reinforced ardealite product, the modified ardealite has good mechanical properties and waterproof performance, and a new idea can be provided for the preparation of the high-performance ardealite product.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a phosphate building gypsum enhancer based on chip sludge and a preparation and use method thereof. Background Art

[0002] The main components of chip sludge include CaF 2 、SiO 2 、CaCO 3 etc. Impurity elements mainly include Si, Na, S, etc., and also contain other heavy metal impurity elements, such as Fe, Cr, Cu, Ni, Mn, etc. In addition, the flocculant polyaluminium chloride (PAC) added in the sewage flocculation and sedimentation process will introduce Al element impurities. At present, the main resource utilization idea of ​​chip sludge is to use certain technical means to grade and utilize calcium fluoride and other impurities. For example, patent CN112897562A discloses a method for purifying calcium fluoride from chip sludge, mixing acid and calcium fluoride sludge under high temperature and high pressure for leaching, then filtering, washing the filter cake to neutrality, and then reacting the filter cake with alkali solution, filtering the obtained filter cake for calcination, or washing the filter cake with an organic solvent to remove organic matter, you can get high-purity calcium fluoride. This solution is simple in process and alleviates the shortage of fluorite resources, but it does not treat the chip sludge filtrate.

[0003] The composition of phosphogypsum is very complex, and its main chemical components are CaO and SO 3 , accounting for more than 91%, and a small amount of Al 2 O 3 , Fe 2 O 3 、SiO 2 In addition, there are some organic matter, fluoride, heavy metal ions and trace radioactive elements in phosphogypsum, which seriously affect the reuse of phosphogypsum. Its main phase structure is CaSO 4 ·2H 2 O, accounting for more than 80%, and a small amount of eutectic phosphorus (CaHPO 4 ·2H 2 O) and SiO 2 In addition, some phosphogypsum also contains insoluble phosphorus (Ca 3 (PO 4 ) 2 ) and insoluble fluorine (CaSiF 6 , CaF 2) and other impurities. Its main resource utilization methods include road construction, cement retarder, gypsum board, building gypsum, etc. Among them, building gypsum is an important direction for the utilization of phosphogypsum due to its large dosage and high added value. The free phosphorus in phosphogypsum will prolong the setting time of phosphogypsum building gypsum, reduce its strength, and cause the structure of phosphogypsum building gypsum to become loose, which limits the promotion and application of phosphogypsum building gypsum.

[0004] In order to solve the above technical problems, aluminum ions, iron ions, etc. can be used to react with phosphate ions to form precipitation, which can effectively solidify free phosphorus. However, since the precipitation of phosphate ions and metal ions usually requires acidic conditions to occur effectively, and precipitation usually occurs on the surface of phosphogypsum, it will prevent further hydration of phosphogypsum, resulting in rapid strength decay. Summary of the invention

[0005] The main purpose of the present invention is to provide a phosphogypsum reinforcing agent based on chip sludge in view of the problems and shortcomings of the prior art, which can realize the resource utilization of various effective components such as calcium fluoride and aluminum-containing components in chip sludge; applying it to reinforce phosphogypsum products can take into account good mechanical properties and waterproof properties, and can provide a new idea for the preparation of high-performance phosphogypsum products.

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

[0007] A phosphate building gypsum enhancer 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 prepared by adding water to chip sludge to make pulp, then adding acid solution, hydrogen-containing silicone oil emulsion, surfactant, and emulsifier, heating and stirring, emulsifying, standing and settling, filtering, and collecting 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 pulping step controls the concentration of the obtained chip sludge pulp to be 50-55wt%.

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

[0011] Furthermore, the acid solution may be hydrochloric acid, nitric acid or acetic acid, etc., and its concentration is 0.9-2.0 mol / L.

[0012] Preferably, the acid solution is hydrochloric acid, and its concentration is 0.9-1.2 mol / L.

[0013] In the above scheme, the surfactant can be selected from Tween, silane coupling agent or aluminate surfactant.

[0014] In the above scheme, the emulsifier can be selected from Span, fatty acid glyceride or polyoxyethylene fatty alcohol ether.

[0015] Preferably, the emulsifier comprises Span 80 (pH value 5-8) and polyoxyethylene octylphenol ether-10 (pH value 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 FeCl 3 Solution or FeSO 4 solution etc.

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

[0019] In the above scheme, the temperature used for heating and stirring is 50-70°C, the time is 40-50min, and the stirring rate is 400-660r / min.

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

[0021] In the above scheme, the static precipitation is performed for 2 to 3 hours.

[0022] Furthermore, the obtained precipitate has calcium fluoride as the main component and the purity can reach 65-80%. After flotation treatment, it can replace fluorite resources and alleviate the problem of fluorite resource shortage.

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

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

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

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

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

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

[0029] 2) adding part of the ionic liquid or organic solvent to the obtained solution A, stirring evenly to obtain solution B; dissolving the amine modifier in the remaining ionic liquid or organic solvent, stirring evenly to obtain solution C;

[0030] 3) The obtained solution B is mixed with the solution C, stirred, and then subjected to heating and stirring pretreatment, and then subjected to heating reaction to obtain the phosphorus building gypsum enhancer.

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

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

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

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

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

[0036] In the above scheme, in step 3), the temperature used for heat stirring pretreatment is 110-150°C, the time is 30-45min, and the stirring speed is 180-320r / min; the temperature used for heating reaction is 160-210°C, and the time is 1-5h.

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

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

[0039] In the above scheme, the obtained enhanced phosphorus building gypsum has a compressive strength of 8-9MPa, 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 the present invention is:

[0041] The phosphorus building gypsum enhancer of the present invention uses chip sludge as a main raw material, adds water to the chip sludge to make pulp, adds acid solution, hydrogen silicone oil emulsion, surfactant and emulsifier to carry out heating and stirring, emulsification, stirring treatment, static precipitation and collection, collects the filtrate to obtain chip sludge separation liquid; then combines stearic acid, amine modifier, iron salt solution and other components to prepare the phosphorus building gypsum enhancer based on chip sludge.

[0042] The phospho-gypsum reinforcing agent is used to enhance and modify phospho-gypsum. 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 phospho-gypsum to mainly form aluminum phosphate precipitation, improve the water resistance of the phospho-gypsum, and to a certain extent solve the problems such as the strength decline of the gypsum after hardening in a humid environment; at the same time, the aluminum phosphate precipitation can be guided to mainly coat the surface of the formed colloids (a small amount) such as aluminum sulfate and aluminum hydroxide, which helps to ensure the hydration process of the phospho-gypsum, and effectively increase the compressive strength and durability of the obtained phospho-gypsum hydration products.

[0043] Further combining with 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, the phosphate building gypsum can be hydrophobically modified. Stearic acid can adhere to the surface of holes and pores inside the hardened phosphate gypsum to form a hydrophobic layer. This structure works together with the low surface energy properties of stearic acid itself to give the material a strong hydrophobic surface; hydrogen-containing silicone oil can form a mesh hydrophobic film inside the material, reducing the water absorption rate of the material, thereby increasing the softening coefficient of the phosphate building gypsum.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1) The present 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) The present invention makes full use of the aluminum-containing components in the chip sludge separation liquid, and under the promotion of the amine modifier, reacts with the free phosphorus in the phosphogypsum to form aluminum phosphate precipitation, which can effectively ensure the hydration process of the phosphogypsum, play a role in strengthening and waterproofing the phosphogypsum, and achieve the purpose of treating waste with waste;

[0047] 3) Fe introduced by the iron salt solution in the phosphorus building gypsum enhancer of the present invention 3+ It can react with the free phosphorus in phosphogypsum to generate phosphate chemical bonding materials, and the formed micro-nano iron phosphate particles have a solidifying effect on heavy metals; and the formed phosphate material has a high compressive strength, and through chemical bonding and physical encapsulation, it can achieve stable solidification of heavy metals, reduce environmental pollution, and has significant economic and environmental benefits;

[0048] 4) The preparation method and application method of the phosphorus building gypsum enhancer of the present invention are relatively simple and easy to operate, and can effectively improve the mechanical properties and waterproof properties of phosphogypsum products, and has wide applicability. DETAILED DESCRIPTION

[0049] In order to more clearly and thoroughly illustrate the advantages of the present invention, the present invention is further described in detail through the following specific implementation cases. The specific embodiments described herein are only used to illustrate the present invention and are not used to limit the scope of protection of the present invention. After reading the present invention, the various equivalent forms of modifications to the present invention by those skilled in the art are all within the scope of the claims attached to this application.

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

[0051] The content of hemihydrate calcium sulfate in the adopted phosphorus building gypsum is 65wt%, and the free phosphorus content is 5-20%.

[0052] Example 1

[0053] A phosphate building gypsum enhancer based on chip sludge, comprising the following components by weight: 335 parts of chip sludge separation liquid, 6 parts of stearic acid, 11196 parts of solvent (pinene), 65 parts of amine modifier (dehydroabietylamine), 15 parts of FeCl 3 Solution (concentration 41 mg / L, the same below), 388 parts of water;

[0054] The chip sludge treatment method comprises the following steps: taking 286 parts of chip sludge and adding them into a plastic beaker, adding water to adjust the pulp mass fraction to 50%, adding 11 parts of hydrochloric acid (0.9 mol / L, the same below), 6 parts of hydrogenated silicone oil emulsion (hydrogenated polysiloxane content is 0.7 wt%), 5 parts of surfactant (Tween 80), 10 parts of emulsifier (Span 80 and polyoxyethylene octylphenol ether-10 are compounded in a mass ratio of 20:8), and then controlling the temperature to 60°C, stirring for 40 minutes, and stirring at a speed of 450 r / min to obtain solution A; emulsifying the obtained solution A with a high shear Lansbury emulsifier for 20 minutes, at an emulsification speed of 3000 min / r, and standing for precipitation for 1.2 hours to obtain solution B; filtering to obtain a chip sludge separation liquid (pH value is 8).

[0055] The specific preparation method of the phosphorus building gypsum enhancer comprises the following steps:

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

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

[0058] 3) The obtained solution B and solution C are mixed, stirred for 65 minutes at a stirring speed of 180 r / min, then poured into a quartz tube, sealed and placed in a reactor, pre-stirred at 120° C. for 40 minutes at a stirring speed of 245 r / min, and then reacted at 180° C. for 3 hours to obtain a phosphorus building gypsum enhancer.

[0059] Application Examples

[0060] The obtained phosphorus building gypsum enhancer and phosphorus building gypsum slurry (the concentration of phosphorus building gypsum is 25wt%) are mixed in a mass ratio of 5:50, stirred for 2 minutes, cast into shape, and naturally cured for 3 to 5 days to obtain a phosphorus building gypsum test piece.

[0061] Example 2

[0062] A phosphorus building gypsum enhancer based on chip sludge, the preparation method of which is substantially the same as that of Example 1, except that the phosphorus building gypsum enhancer comprises the following components by weight: 414 parts of chip sludge separation liquid, 9 parts of stearic acid, 13268 parts of pinene, 76 parts of amine modifier, FeCl 326 parts of solution, 453 parts of water; and in the preparation process of chip sludge separation liquid, the raw materials and their weight proportions are: 350 parts of chip sludge, 13 parts of hydrochloric acid, 8 parts of surfactant, 12 parts of emulsifier, and 8 parts of hydrogenated silicone oil emulsion.

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

[0064] Example 3

[0065] A phosphorus building gypsum enhancer based on chip sludge, the preparation method and application method of which are roughly the same as those in Example 1, except that: the phosphorus building gypsum enhancer comprises the following components by weight: 505 parts of chip sludge separation liquid, 7 parts of stearic acid, 13268 parts of 1-ethyl-3-methylimidazole, 88 parts of amine modifier, FeCl 3 30 parts of solution, 490 parts of water; and in the preparation process of chip sludge separation liquid, the raw materials and their weight proportions are: 410 parts of chip sludge, 15 parts of hydrochloric acid, 8 parts of surfactant, 18 parts of emulsifier, and 8 parts of hydrogenated silicone oil emulsion.

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

[0067] Example 4

[0068] A phosphorus building gypsum enhancer based on chip sludge, the preparation method and application method of which are substantially the same as those of Example 1, except that the phosphorus building gypsum enhancer comprises the following components by weight: 535 parts of chip sludge separation liquid, 15 parts of stearic acid, 13268 parts of pinene, 99 parts of amine modifier, FeCl 3 45 parts of solution, 589 parts of water; and in the preparation process of chip sludge separation liquid, the raw materials and their weight proportions are: 466 parts of chip sludge, 12 parts of hydrochloric acid, 10 parts of surfactant, 22 parts of emulsifier, and 10 parts of hydrogenated silicone oil emulsion;

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

[0070] Example 5

[0071] A phosphorus building gypsum enhancer based on chip sludge, the preparation method of which is substantially the same as that of Example 1, except that the phosphorus building gypsum enhancer comprises the following components by weight: 459 parts of chip sludge separation liquid, 5 parts of stearic acid, 13268 parts of pinene, 89 parts of amine modifier, FeCl 330 parts of solution, 600 parts of water; and in the preparation process of chip sludge separation liquid, the raw materials and their weight proportions are: 446 parts of chip sludge, 10 parts of hydrochloric acid, 10 parts of surfactant, 15 parts of emulsifier, and 3 parts of hydrogenated silicone oil emulsion;

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

[0073] Example 6

[0074] A phosphorus building gypsum enhancer based on chip sludge, the preparation method and application method of which are roughly the same as those in Example 1, except that: the phosphorus building gypsum enhancer comprises the following components by weight: 430 parts of chip sludge separation liquid, 9 parts of stearic acid, 13268 parts of pinene, 75 parts of amine modifier, FeCl 3 40 parts of solution, 587 parts of water; and in the preparation process of chip sludge separation liquid, the raw materials and their weight proportions are: 310 parts of chip sludge, 15 parts of hydrochloric acid, 8 parts of surfactant, 18 parts of emulsifier, and 9 parts of hydrogenated silicone oil emulsion;

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

[0076] Comparative Example 1

[0077] A phosphate building gypsum enhancer based on chip sludge, whose preparation method and application method are roughly the same as those in Example 4, except that: 8 parts of surfactant, 18 parts of emulsifier, and 8 parts of hydrogenated silicone oil emulsion are replaced by 34 parts of water.

[0078] Comparative Example 2

[0079] A phosphate building gypsum enhancer based on chip sludge, whose preparation method and application method are roughly the same as those of Example 4, except that: 99 parts of amine modifier are replaced by 99 parts of water.

[0080] Comparative Example 3

[0081] A phosphorus building plaster enhancer based on chip sludge, the preparation method and application method of which are substantially the same as those of Example 4, except that: the phosphorus building plaster enhancer comprises the following components by weight: 15 parts of stearic acid, 13268 parts of pinene, 99 parts of amine modifier, FeCl 3 Solution 445 parts, water 589 parts, hydrochloric acid 12 parts, surfactant 10 parts, emulsifier 22 parts, hydrogen silicone oil emulsion 10 parts.

[0082] Table 1 Performance test results of phosphorus building gypsum specimens obtained in Examples 1 to 6 and Comparative Examples 1 to 2

[0083]

[0084]

[0085] 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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A phosphate building gypsum enhancer based on chip sludge, characterized in that: The chip sludge separation liquid comprises the following components by weight: 310 to 560 parts of chip sludge separation liquid, 3 to 15 parts of stearic acid, 10,000 to 19,860 parts of ionic liquid or organic solvent, 60 to 107 parts of amine modifier, 15 to 46 parts of iron salt solution, and 277 to 875 parts of water; wherein the chip sludge separation liquid is prepared by adding water to the chip sludge to make pulp, and then adding acid solution, hydrogen-containing silicone oil emulsion, surfactant, and emulsifier to perform heating and stirring, emulsification, static precipitation, filtering, and collecting the filtrate.

2. The phosphorus building plaster enhancer according to claim 1, characterized in that: The components introduced into the chip sludge separation liquid and their weight proportions include: 285-487 parts of chip sludge, 10-15 parts of acid solution, 4-10 parts of surfactant, 10-28 parts of emulsifier, and 2-15 parts of hydrogenated silicone oil emulsion.

3. The phosphorus building gypsum enhancer according to claim 2, characterized in that: The acid solution is hydrochloric acid, nitric acid or acetic acid, and its concentration is 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.

4. The phosphorus building plaster enhancer according to claim 2, characterized in that: The main component of the hydrogen-containing silicone oil emulsion is hydrogen-containing polysiloxane, and the concentration thereof is 0.5-1 wt %.

5. The phosphorus building plaster enhancer according to claim 2, characterized in that: The ionic liquid is 1-butyl-3-methyl imidazole bromide, 1-ethyl-3-methyl imidazole, 1-propyl-3-methylpyridine or triethylammonium phosphate; and the organic solvent is pinene or tetrabutylammonium fluoride.

6. The phosphorus building plaster enhancer according to claim 1, characterized in that: The amine modifier is dehydroabietylamine, 1,4-butanediamine, ethylenediamine or heterocyclic aromatic amine.

7. The phosphorus building plaster enhancer according to claim 1, characterized in that: The main chemical components and their contents in the chip sludge include: 30-70% calcium fluoride, 0.5-10% aluminum component, 5-20% silicon dioxide, 7.10-27.60g / kg phosphate; its water content is 60-80%, and the pH value is 6.5-8.

5.

8. The method for preparing the phosphorus building gypsum enhancer based on chip sludge according to claim 1, characterized in that: The following steps are involved: 1) Mixing the chip sludge separation liquid with stearic acid and water, and stirring to obtain solution A; 2) adding part of the ionic liquid or organic solvent to the obtained solution A, stirring evenly to obtain solution B; dissolving the amine modifier in the remaining ionic liquid or organic solvent, stirring evenly to obtain solution C; 3) The obtained solution B is mixed with the solution C, stirred, and then subjected to heating and stirring pretreatment, and then subjected to heating reaction to obtain the phosphorus building gypsum enhancer.

9. The preparation method according to claim 8, characterized in that: In step 3), the temperature used for the heat stirring pretreatment is 110-150° C. and the time is 30-45 min; the temperature used for the heating reaction is 160-210° C. and the time is 1-5 h.

10. A method for using the phosphorus building gypsum enhancer based on chip sludge according to any one of claims 1 to 7 or the phosphorus building gypsum enhancer based on chip sludge obtained by the preparation method according to any one of claims 8 to 9, characterized in that: The method comprises the following steps: mixing the phosphorus building gypsum enhancer and the phosphorus building gypsum in a mass ratio of 1 to 10:50, and stirring the mixture.

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