Mining gel and preparation method thereof

Abstract

The invention discloses mining gel and a preparation method thereof, and relates to the field of mining gel. When the mining gel is prepared, microcrystalline cellulose is subjected to formylation and then is grafted with indorex ester to obtain modified cellulose; the preparation method comprises the following steps: initiating pyridine-3, 4-dicarboxylic anhydride and 1, 2-epoxy-5-hexene by lignin to polymerize on the surface of ardealite powder to prepare modified ardealite; and uniformly mixing the modified cellulose, the modified phosphogypsum, allyltrimethoxysilane and hydrogen-containing silicone oil to obtain the mining gel. The mining gel prepared by the invention has excellent flame retardance, impact strength and metal ion complexing property.

Description

Technical Field

[0001] The invention relates to the field of mining gel, in particular to a mining gel and a preparation method thereof. Background Art

[0002] With the continuous advancement of global economic integration and the higher requirements of human social development, shallow metal mine resources in various countries are exhausted year by year. The contradiction between the demand for rapid economic development and the supply of metal mineral resources is still relatively prominent, driving the mining depth of underground metal mine resources to increase successively. There is a problem of high well temperature in deep mining. The temperature of the rock layer at the surface mining surface can rise to about 30-60°C. The environment under high temperature in deep wells is more complex, which will further increase the hazard of spontaneous combustion of mine oxidation, and the difficulty of prevention and control will increase sharply. Spontaneous combustion in mines is universal and hidden. The multiple disasters caused by it and the large amount of toxic gases released cause poisoning and suffocation of underground workers, which brings a series of adverse effects on the safety of workers, surrounding environmental conditions, and corporate economic development. Therefore, the present invention prepares a mining gel with excellent flame retardancy. Summary of the invention

[0003] The purpose of the present invention is to provide a mining gel and a preparation method thereof to solve the problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] The invention discloses a mining gel, which is prepared by uniformly mixing modified cellulose, modified phosphogypsum, allyltrimethoxysilane and hydrogen-containing silicone oil.

[0006] As an optimization, the modified phosphogypsum is polymerized on the surface of phosphogypsum powder by pyridine-3,4-dicarboxylic anhydride and 1,2-epoxy-5-hexene initiated by lignin.

[0007] As an optimization, the modified cellulose is obtained by aldehyde-modifying microcrystalline cellulose and then grafting indolyl ester.

[0008] As an optimization, the phosphogypsum powder model is industrial grade and comes from Guizhou Huaxinlai Construction Engineering Co., Ltd.

[0009] As an optimization, the microcrystalline cellulose model is industrial grade and comes from Shandong Shouhua Chemical Co., Ltd.

[0010] A method for preparing a mining gel comprises the following steps:

[0011] (1) Mix microcrystalline cellulose and deionized water in a mass ratio of 1:(49-51), add 30%-40% hydrochloric acid solution to adjust the pH to 2-4, ultrasonically disperse for 10-20 min, add sodium periodate in an amount of 1-3 times the molar amount of microcrystalline cellulose, stir for 2-4 h at 30-40° C. and 200-300 rpm in a dark environment, cool naturally to room temperature, add 1-2 times the mass of microcrystalline cellulose ethylene glycol, and continue stirring for 1-3 h. After filtering, washing with deionized water and anhydrous ethanol alternately for 3 to 5 times, and drying at 65 to 75° C. for 10 to 12 hours to obtain aldehyded cellulose; mixing aldehyded cellulose, indolyl ester and anhydrous ethanol in a mass ratio of 1: (2 to 4): (15 to 25), stirring at 65 to 75° C. and 300 to 400 rpm for 7 to 9 hours, naturally cooling to room temperature and filtering, washing with deionized water for 3 to 5 times, and drying at 55 to 65° C. for 7 to 9 hours to obtain modified cellulose;

[0012] (2) mixing phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide in a mass ratio of 1:(1.1-1.2):(0.4-0.6):(0.1-0.3):(0.04-0.06):(0.01-0.02):(4-5), stirring at 95-105° C. and 300-400 rpm for 11-13 h in a nitrogen atmosphere, cooling naturally to room temperature, adding acetic acid in an amount of 0.2-0.3 times the mass of the phosphogypsum powder, standing for 1-2 h, filtering, washing with methanol and deionized water for 3-5 times respectively, and drying at 65-75° C. for 8-10 h to obtain modified phosphogypsum;

[0013] (3) Modified cellulose, modified phosphogypsum, allyltrimethoxysilane, hydrogenated silicone oil, chloroplatinic acid and deionized water are mixed in a mass ratio of 1:(0.3-0.5):(0.1-0.3):(1.5-2.5):(0.01-0.02):(30-40), stirred at 20-30°C and 300-500 rpm for 1-2 h, allowed to stand at 70-80°C for 23-25 ​​h, ground and sieved through 40-60 mesh to obtain a mining gel.

[0014] As an optimization, the reaction equation for the modified cellulose in step (1) is:

[0015]

[0016] As an optimization, the reaction equation of the modified phosphogypsum in step (2) is:

[0017]

[0018] As an optimization, the lignin in step (2) is of industrial grade and comes from Jinan Shanzheng Trading Co., Ltd.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] When preparing the mining gel, the invention comprises the following steps: aldehyde-forming microcrystalline cellulose and then grafting indolide ester to obtain modified cellulose; polymerizing pyridine-3,4-dicarboxylic anhydride and 1,2-epoxy-5-hexene on the surface of phosphogypsum powder via lignin initiation to obtain modified phosphogypsum; and uniformly mixing the modified cellulose, modified phosphogypsum, allyltrimethoxysilane and hydrogen-containing silicone oil to obtain the mining gel.

[0021] Firstly, microcrystalline cellulose was aldehyde-modified and then grafted with indolyl ester to obtain modified cellulose; pyridine-3,4-dicarboxylic anhydride and 1,2-epoxy-5-hexene were polymerized on the surface of phosphogypsum powder by lignin initiation to obtain modified phosphogypsum; indolyl ester was grafted onto microcrystalline cellulose by Schiff base reaction, and the indole nitrogen heterocyclic ring was induced to ·OH and H 2 O 2 Transfer charge and reduce it to a stable, water-soluble and non-toxic product H 2 O, avoid further redox reaction and improve the flame retardancy of mining gel; introduce pyridine ring on the surface of phosphogypsum through ring-opening polymerization of acid anhydride and epoxy group, form a cross-linked network through metal coordination and complexation, complex metal slag, and improve the impact strength and metal ion complexation of mining gel.

[0022] Secondly, the modified cellulose, modified phosphogypsum, allyl trimethoxy silane and hydrogen-containing silicone oil are mixed to prepare the mining gel; the carbon-carbon double bonds introduced on the surface of the modified phosphogypsum are used to add-crosslink the hydrogen-containing silicone oil and allyl trimethoxy silane under the catalysis of chloroplatinic acid to enrich the crosslinking network and improve the impact strength of the mining gel; the long silicon-oxygen chain formed by the self-polymerization of allyl trimethoxy silane can not only enhance the crosslinking of the gel itself, but also strengthen the binding effect with metal and non-metal slag, further improving the impact strength of the mining gel; the large number of hydroxyl groups on the modified cellulose can complex metal ions through hydrogen bonding, thereby improving the impact strength and metal ion complexing property of the mining gel. DETAILED DESCRIPTION

[0023] The following will be combined with 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.

[0024] The raw materials used in the following examples and comparative examples are all commercially available:

[0025] The phosphogypsum powder is of industrial grade and comes from Guizhou Huaxinlai Construction Engineering Co., Ltd.

[0026] The microcrystalline cellulose model is industrial grade and comes from Shandong Shouhua Chemical Co., Ltd.

[0027] The model of the lignin is industrial grade and comes from Jinan Shanzheng Trading Co., Ltd.

[0028] Embodiment 1:

[0029] A method for preparing a mining gel, the method comprising the following steps:

[0030] (1) Mixing microcrystalline cellulose and deionized water in a mass ratio of 1:49, adding a 30% hydrochloric acid solution to adjust the pH to 2, ultrasonically dispersing for 10 minutes, adding sodium periodate in an amount equal to 1 times the molar amount of microcrystalline cellulose, stirring at 30°C and 200 rpm for 4 hours under light-proof conditions, naturally cooling to room temperature, adding ethylene glycol in an amount equal to 1 times the mass of microcrystalline cellulose, continuing to stir for 3 hours, filtering, washing with deionized water and anhydrous ethanol alternately for 3 times, and drying at 65°C for 12 hours to obtain aldehyded cellulose; mixing aldehyded cellulose, indolyl ester and anhydrous ethanol in a mass ratio of 1:2:15, stirring at 65°C and 300 rpm for 9 hours, naturally cooling to room temperature, filtering, washing with deionized water for 3 times, and drying at 55°C for 9 hours to obtain modified cellulose;

[0031] (2) mixing phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide in a mass ratio of 1:1.1:0.4:0.1:0.04:0.01:4, stirring for 13 h at 95 °C and 300 rpm in a nitrogen atmosphere, cooling naturally to room temperature, adding acetic acid 0.2 times the mass of phosphogypsum powder, standing for 1 h and filtering, washing with methanol and deionized water for 3 times respectively, and drying at 65 °C for 10 h to obtain modified phosphogypsum;

[0032] (3) Modified cellulose, modified phosphogypsum, allyl trimethoxysilane, hydrogenated silicone oil, chloroplatinic acid and deionized water were mixed in a mass ratio of 1:0.3:0.1:1.5:0.01:30, stirred at 20°C and 300 rpm for 2 h, allowed to stand at 70°C for 25 h, ground and sieved through 40 mesh to obtain a mining gel.

[0033] Embodiment 2:

[0034] A method for preparing a mining gel, the method comprising the following steps:

[0035] (1) Mixing microcrystalline cellulose and deionized water in a mass ratio of 1:50, adding a 35% hydrochloric acid solution to adjust the pH to 3, ultrasonically dispersing for 15 minutes, adding sodium periodate twice the molar amount of microcrystalline cellulose, stirring at 35°C and 250 rpm for 3 hours under light-proof conditions, naturally cooling to room temperature, adding ethylene glycol 1.5 times the mass of microcrystalline cellulose, continuing to stir for 2 hours, filtering, washing with deionized water and anhydrous ethanol alternately for 4 times, and drying at 70°C for 11 hours to obtain aldehyded cellulose; mixing aldehyded cellulose, indolyl ester and anhydrous ethanol in a mass ratio of 1:3:20, stirring at 70°C and 350 rpm for 8 hours, naturally cooling to room temperature, filtering, washing with deionized water for 4 times, and drying at 60°C for 8 hours to obtain modified cellulose;

[0036] (2) mixing phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide in a mass ratio of 1:1.15:0.5:0.2:0.05:0.015:4.5, stirring for 12 h at 100 °C and 350 rpm in a nitrogen atmosphere, cooling naturally to room temperature, adding acetic acid 0.25 times the mass of the phosphogypsum powder, standing for 1.5 h and filtering, washing with methanol and deionized water for 4 times respectively, and drying at 70 °C for 9 h to obtain modified phosphogypsum;

[0037] (3) Modified cellulose, modified phosphogypsum, allyltrimethoxysilane, hydrogenated silicone oil, chloroplatinic acid and deionized water were mixed in a mass ratio of 1:0.4:0.2:2:0.015:35, stirred at 25°C and 400 rpm for 1.5 h, allowed to stand at 75°C for 24 h, ground and sieved through 50 mesh to obtain a mining gel.

[0038] Embodiment 3:

[0039] A method for preparing a mining gel, the method comprising the following steps:

[0040] (1) Mixing microcrystalline cellulose and deionized water in a mass ratio of 1:51, adding a 40% hydrochloric acid solution to adjust the pH to 4, ultrasonically dispersing for 20 minutes, adding sodium periodate 3 times the molar amount of microcrystalline cellulose, stirring at 40°C and 300 rpm for 2 hours under light-proof conditions, naturally cooling to room temperature, adding ethylene glycol 2 times the mass of microcrystalline cellulose, continuing to stir for 3 hours, filtering, washing with deionized water and anhydrous ethanol alternately for 5 times, and drying at 75°C for 10 hours to obtain aldehyded cellulose; mixing aldehyded cellulose, indolyl ester and anhydrous ethanol in a mass ratio of 1:4:25, stirring at 75°C and 400 rpm for 7 hours, naturally cooling to room temperature, filtering, washing with deionized water for 5 times, and drying at 65°C for 7 hours to obtain modified cellulose;

[0041] (2) mixing phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide in a mass ratio of 1:1.2:0.6:0.3:0.06:0.02:5, stirring for 11 h at 105° C. and 400 rpm in a nitrogen atmosphere, naturally cooling to room temperature, adding acetic acid 0.3 times the mass of the phosphogypsum powder, standing for 2 h, filtering, washing with methanol and deionized water for 5 times respectively, and drying at 75° C. for 8 h to obtain modified phosphogypsum;

[0042] (3) Modified cellulose, modified phosphogypsum, allyl trimethoxysilane, hydrogenated silicone oil, chloroplatinic acid and deionized water were mixed in a mass ratio of 1:0.5:0.3:2.5:0.02:40, stirred at 30°C and 500 rpm for 1 h, allowed to stand at 80°C for 23 h, ground and sieved through 60 mesh to obtain a mining gel.

[0043] Comparative Example 1:

[0044] A method for preparing a mining gel, the method comprising the following steps:

[0045] (1) mixing phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide in a mass ratio of 1:1.15:0.5:0.2:0.05:0.015:4.5, stirring for 12 h at 100 °C and 350 rpm in a nitrogen atmosphere, naturally cooling to room temperature, adding acetic acid 0.25 times the mass of the phosphogypsum powder, standing for 1.5 h, filtering, washing with methanol and deionized water for 4 times respectively, and drying at 70 °C for 9 h to obtain modified phosphogypsum;

[0046] (2) Microcrystalline cellulose, modified phosphogypsum, allyl trimethoxysilane, hydrogenated silicone oil, chloroplatinic acid and deionized water were mixed in a mass ratio of 1:0.4:0.2:2:0.015:35, stirred at 25°C and 400 rpm for 1.5 h, allowed to stand at 75°C for 24 h, ground and sieved through 50 mesh to obtain a mining gel.

[0047] Comparative Example 2:

[0048] A method for preparing a mining gel, the method comprising the following steps:

[0049] (1) Mixing microcrystalline cellulose and deionized water in a mass ratio of 1:50, adding a 35% hydrochloric acid solution to adjust the pH to 3, ultrasonically dispersing for 15 minutes, adding sodium periodate twice the molar amount of microcrystalline cellulose, stirring at 35°C and 250 rpm for 3 hours under light-proof conditions, naturally cooling to room temperature, adding ethylene glycol 1.5 times the mass of microcrystalline cellulose, continuing to stir for 2 hours, filtering, washing with deionized water and anhydrous ethanol alternately for 4 times, and drying at 70°C for 11 hours to obtain aldehyded cellulose; mixing aldehyded cellulose, indolyl ester and anhydrous ethanol in a mass ratio of 1:3:20, stirring at 70°C and 350 rpm for 8 hours, naturally cooling to room temperature, filtering, washing with deionized water for 4 times, and drying at 60°C for 8 hours to obtain modified cellulose;

[0050] (2) Modified cellulose, phosphogypsum, allyltrimethoxysilane, hydrogenated silicone oil, chloroplatinic acid and deionized water were mixed in a mass ratio of 1:0.4:0.2:2:0.015:35, stirred at 25°C and 400 rpm for 1.5 h, allowed to stand at 75°C for 24 h, ground and sieved through 50 mesh to obtain a mining gel.

[0051] Comparative Example 3:

[0052] A method for preparing a mining gel, the method comprising the following steps:

[0053] (1) Mixing microcrystalline cellulose and deionized water in a mass ratio of 1:50, adding a 35% hydrochloric acid solution to adjust the pH to 3, ultrasonically dispersing for 15 minutes, adding sodium periodate twice the molar amount of microcrystalline cellulose, stirring at 35°C and 250 rpm for 3 hours under light-proof conditions, naturally cooling to room temperature, adding ethylene glycol 1.5 times the mass of microcrystalline cellulose, continuing to stir for 2 hours, filtering, washing with deionized water and anhydrous ethanol alternately for 4 times, and drying at 70°C for 11 hours to obtain aldehyded cellulose; mixing aldehyded cellulose, indolyl ester and anhydrous ethanol in a mass ratio of 1:3:20, stirring at 70°C and 350 rpm for 8 hours, naturally cooling to room temperature, filtering, washing with deionized water for 4 times, and drying at 60°C for 8 hours to obtain modified cellulose;

[0054] (2) mixing phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide in a mass ratio of 1:1.15:0.5:0.2:0.05:0.015:4.5, stirring for 12 h at 100 °C and 350 rpm in a nitrogen atmosphere, cooling naturally to room temperature, adding acetic acid 0.25 times the mass of the phosphogypsum powder, standing for 1.5 h and filtering, washing with methanol and deionized water for 4 times respectively, and drying at 70 °C for 9 h to obtain modified phosphogypsum;

[0055] (3) Modified cellulose, modified phosphogypsum, hydrogenated silicone oil, chloroplatinic acid and deionized water were mixed in a mass ratio of 1:0.4:2:0.015:35, stirred at 25°C and 400 rpm for 1.5 h, allowed to stand at 75°C for 24 h, ground and sieved through 50 mesh to obtain a mining gel.

[0056] Test Case

[0057] Mix citric acid and a 20% by mass polyaluminium chloride solution in a mass ratio of 1:2, add a 5% by mass sodium hydroxide solution to adjust the pH to 6.5, and obtain a metal cross-linking solution;

[0058] The mining gel, 80-mesh coal slag, metal cross-linking liquid and deionized water were mixed in a mass ratio of 1:3:1:3, and allowed to stand at 25° C. for 48 h to obtain a sample to be tested.

[0059] 1. Flame retardancy

[0060] Test method: Take 5g of the sample to be tested obtained from each embodiment and comparative example, put it into a tube furnace and connect the gas line, set the air flow rate to 60ml / min, the heating rate to 1℃ / min, the temperature range to 20℃~220℃, collect the gas after the reaction into a gas sample bag, pass it into a gas chromatograph for analysis, and detect the oxygen content Q 1 (The oxygen content of pure coal slag is Q 0 ), calculate the rate of decline = (Q 0 -Q 1 ) / Q 0 *100%.

[0061] 2. Impact strength

[0062] Test method: Take the same mass m of the samples obtained in each embodiment and comparative example 0 , let the steel ball fall freely vertically from the center, remove the debris, and measure the mass m 1 , calculate the mass loss rate

[0063] =(m 0 -m 1 ) / m 0 *100%.

[0064] 3. Metal ion complexation

[0065] Test method: The mining gel obtained in each embodiment and comparative example, 80 mesh metallic copper slag and deionized water were mixed in a mass ratio of 1:3:3, and allowed to stand at 25°C for 48 hours to obtain a test sample. The test sample was immersed in 10 times the volume of deionized water, taken out after 48 hours, and the copper ion concentration in the deionized water was tested according to GB / T8978.

[0066] Table 1 below shows the analysis results of flame retardancy, impact strength and metal ion complexing properties of the mining gels of Examples 1 to 3 of the present invention and Comparative Examples 1 to 3.

[0067] Table 1

[0068] Decline rate % Mass loss rate % Copper ion concentration mg / L Example 1 12.5 2.1 0.12 Example 2 13.2 1.8 0.11 Example 3 12.9 2.3 0.15 Comparative Example 1 1.6 13.7 0.84 Comparative Example 2 12.4 13.5 0.93 Comparative Example 3 12.1 13.9 0.17

[0069] From the comparison of the experimental data of Examples 1 to 3 and Comparative Examples 1 to 3 in Table 1, it can be found that the mining gel prepared by the present invention has good flame retardancy, impact strength and metal ion complexing property.

[0070] By comparison, Examples 1, 2, and 3 have higher reduction rates, lower mass loss rates, and lower ion concentrations than Comparative Example 1, indicating that indole esters are grafted onto microcrystalline cellulose by Schiff base reaction, and indole nitrogen heterocycles are transferred to ·OH, H 2 O 2 Transfer charge and reduce it to a stable, water-soluble and non-toxic product H 2 O, avoiding further redox reaction and improving the flame retardancy of mining gel; a large number of hydroxyl groups on the modified cellulose can complex metal ions through hydrogen bonding, thereby improving the impact strength and metal ion complexing property of mining gel.

[0071] By comparison, the mass loss rate and ion concentration of Examples 1, 2 and 3 are lower than those of Comparative Example 2, which illustrates that pyridine rings are introduced on the surface of phosphogypsum by ring-opening polymerization of acid anhydride and epoxy group, and a cross-linked network is formed through metal coordination and complexation to complex metal slag, thereby improving the impact strength and metal ion complexation of the mining gel; at the same time, the carbon-carbon double bonds introduced on the surface of the phosphogypsum are cross-linked with hydrogenated silicone oil and allyltrimethoxysilane under the catalysis of chloroplatinic acid to enrich the cross-linked network and further improve the impact strength of the mining gel.

[0072] By comparison, the mass loss rates of Examples 1, 2, and 3 are lower than those of Comparative Example 3, indicating that the long silicon-oxygen chains formed by the self-polymerization of allyltrimethoxysilane can not only enhance the cross-linking of the gel itself, but also strengthen the bonding effect with metal and non-metal slag, thereby further improving the impact strength of the mining gel.

[0073] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mining gel, characterized in that: The mining gel is prepared by mixing modified cellulose, modified phosphogypsum, allyltrimethoxysilane and hydrogen-containing silicone oil; The modified phosphogypsum is prepared by polymerization of pyridine-3,4-dicarboxylic anhydride and 1,2-epoxy-5-hexene on the surface of phosphogypsum powder initiated by lignin; The modified cellulose is obtained by aldehyde-forming microcrystalline cellulose and then grafting indolyl ester.

2. A method for preparing a mining gel, characterized in that: The method comprises the following preparation steps: (1) mixing microcrystalline cellulose and deionized water, adding hydrochloric acid solution to adjust the pH, ultrasonically dispersing, adding sodium periodate, stirring in a dark place, cooling to room temperature, adding ethylene glycol, continuing stirring, filtering, washing and drying to obtain aldehyded cellulose; (2) mixing the aldehyded cellulose, indolyl ester and anhydrous ethanol, stirring for reaction, cooling to room temperature, filtering, washing and drying to obtain modified cellulose; (3) mixing phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide, stirring in a nitrogen atmosphere, cooling to room temperature, adding acetic acid, standing and filtering, washing and drying to obtain modified phosphogypsum; (4) The modified cellulose, modified phosphogypsum, allyl trimethoxysilane, hydrogenated silicone oil, chloroplatinic acid and deionized water are mixed, stirred and allowed to stand, and ground and sieved to obtain a mining gel.

3. The method for preparing a mining gel according to claim 2, characterized in that: The specific preparation process of the aldehyded cellulose in step (1) is as follows: microcrystalline cellulose and deionized water are mixed at a mass ratio of 1:(49-51), hydrochloric acid solution is added to adjust the pH, ultrasonic dispersion is performed for 10-20 minutes, sodium periodate is added in an amount of 1-3 times the molar amount of microcrystalline cellulose, and stirred at 30-40° C. and 200-300 rpm for 2-4 hours under light-proof conditions, and naturally cooled to room temperature, ethylene glycol is added in an amount of 1-2 times the mass of the microcrystalline cellulose, and stirring is continued for 1-3 hours, and then filtered, and washed alternately with deionized water and anhydrous ethanol for 3-5 times, and dried at 65-75° C. for 10-12 hours to obtain the aldehyded cellulose.

4. The method for preparing a mining gel according to claim 3, characterized in that: The mass fraction of the hydrochloric acid solution is 30% to 40%.

5. The method for preparing a mining gel according to claim 3, characterized in that: The pH is 2-4.

6. The method for preparing a mining gel according to claim 2, characterized in that: The specific preparation process of the modified cellulose in step (2) is as follows: aldehyded cellulose, indolyl ester and anhydrous ethanol are mixed in a mass ratio of 1:(2-4):(15-25), stirred at 65-75°C and 300-400rpm for 7-9h, naturally cooled to room temperature and then filtered, washed with deionized water for 3-5 times, and dried at 55-65°C for 7-9h to obtain modified cellulose.

7. The method for preparing a mining gel according to claim 2, characterized in that: The specific preparation process of the modified phosphogypsum in step (3) is as follows: phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide are mixed, stirred at 95-105° C. and 300-400 rpm for 11-13 hours in a nitrogen atmosphere, naturally cooled to room temperature, acetic acid in an amount of 0.2-0.3 times the mass of the phosphogypsum powder is added, the mixture is allowed to stand for 1-2 hours and then filtered, washed with methanol and deionized water for 3-5 times respectively, and dried at 65-75° C. for 8-10 hours to obtain the modified phosphogypsum.

8. The method for preparing a mining gel according to claim 7, characterized in that: The phosphogypsum powder, pyridine-3,4-dicarboxylic anhydride, 1,2-epoxy-5-hexene, lignin, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and N,N-dimethylformamide are mixed uniformly according to the mass ratio 1:(1.1~1.2):(0.4~0.6):(0.1~0.3):(0.04~0.06):(0.01~0.02):(4~5)Mix well.

9. The method for preparing a mining gel according to claim 2, characterized in that: The specific preparation process of the mining gel in step (4) is as follows: modifying cellulose, modifying phosphogypsum, allyltrimethoxysilane, hydrogenated silicone oil, chloroplatinic acid and deionized water are mixed, stirred at 20-30° C. and 300-500 rpm for 1-2 h, allowed to stand at 70-80° C. for 23-25 ​​h, and ground and sieved through 40-60 meshes to obtain the mining gel.

10. The method for preparing a mining gel according to claim 9, characterized in that: The modified cellulose, modified phosphogypsum, allyltrimethoxysilane, hydrogen-containing silicone oil, chloroplatinic acid and deionized water are mixed in a mass ratio of 1: (0.3-0.5): (0.1-0.3): (1.5-2.5): (0.01-0.02): (30-40).

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