Mine filling material containing vanadium tailings and preparation method thereof
By combining activated vanadium tailings and modified boron sludge with cement and water reducer, the problem of insufficient compressive strength of vanadium tailings in mine filling materials is solved, the preparation of high-strength mine filling materials is realized, and vanadium tailings resources are effectively utilized.
Patent Information
- Application Number
- CN202510406686.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2025-07-18
AI Technical Summary
In the prior art, the mine filling materials prepared by vanadium tailings have insufficient compressive strength under high strength requirements, which is difficult to meet the needs of underground cementing and filling, building artificial columns and backfill false tops. The existing research mainly focuses on the application of industrial solid waste such as steel slag and fly ash, and vanadium tailings are less utilized.
The combination of activated vanadium tailings and modified boron slurry combined with cement and water reducer is used to prepare mine filling materials through ball milling, stirring, and drying. The specific methods include ball milling vanadium tailings, mixing Na2SO4 solution, mixing with silane coupling agent modified boron slurry, and mixing water reducer, and combining constant temperature and humidity maintenance to improve the compressive strength of the material.
It significantly improves the compressive strength of mine filling materials, realizes the effective utilization of vanadium tailings, reduces the preparation cost, and meets the needs of high-strength mine filling.
Smart Images
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Figure BDA0005341367690000111
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of tailings resource utilization, and particularly relates to a mine filling material containing vanadium tailings and a preparation method thereof. Background Art
[0002] Vanadium tailings refer to the remaining material after useful minerals are separated from vanadium ore through the beneficiation process. It is usually a slurry composed of mineral particles, water and beneficiation reagents. Vanadium tailings contain valuable elements such as iron, titanium, vanadium, etc. that have not been recovered, as well as scattered and rare elements such as cobalt, gallium, scandium, etc., which have great secondary resource utilization value.
[0003] Mine filling materials are inert materials such as crushed stone and waste slag mixed with an appropriate amount of cementitious materials, and then mixed with water to form a cementitious filling slurry. It can be used to backfill mine goafs. It has the characteristics of wide source of raw materials, low price, easy preparation and transportation. Using tailings as mine filling materials can not only reduce waste emissions and protect the mine environment, but also make up for the shortage of filling materials and reduce preparation costs. At present, the research on mine filling materials is mainly focused on the preparation technology using industrial solid wastes such as steel slag, fly ash, and phosphogypsum as raw materials, but there are few reports on the use of vanadium tailings to prepare cementitious materials for mine filling.
[0004] The compressive strength of tailings filling is mainly affected by factors such as the content of cementitious materials, slurry concentration, tailings properties, additive selection, curing environment and curing time. In underground mines, cavities, fissures, goafs and other places, the strength requirements for filling materials are not high, and a low cement content (such as 3-15%) can be used. Although the filling material with this ratio is low in cost, the compressive strength is generally low. Underground cementitious filling, construction of artificial columns, construction of backfill false roofs, etc. have high requirements for the strength of filling materials. Simply increasing the cement content can no longer meet the strength requirements. It is necessary to adjust the ratio of main materials such as tailings and develop new additives to maximize the strength of the material. Summary of the invention
[0005] The object of the present invention is to provide a mine filling material containing vanadium tailings and a preparation method thereof.
[0006] A mine filling material containing vanadium tailings is prepared from the following raw materials in parts by weight: 30-60 parts of activated vanadium tailings, 10-20 parts of modified boron mud, 20-40 parts of cement, 3-8 parts of water reducer and 15-25 parts of water.
[0007] The preparation method of the activated vanadium tailings comprises: adding the vanadium tailings into a ball mill and milling them, wherein the speed of the ball mill is 1-2 r / s and the milling time is 20-40 min; adding the milled vanadium tailings into a Na2SO4 aqueous solution and stirring and mixing them fully, and then putting them into an oven and drying them at 40-60° C. for 0.5-1.5 h.
[0008] The amount of Na2SO4 used is 3-7% of the mass of the vanadium tailings.
[0009] The preparation method of the modified boron mud is as follows: after stirring the silane coupling agent in a water bath at 65-75° C. for 50-60 minutes, adding the boron mud and continuing to stir for 1-3 hours, and drying at 100-110° C.
[0010] The silane coupling agent is one or more of KH550, KH570, KH590 and KH792.
[0011] The cement is one or more of PO42.5, PO52.5, PF42.5 and PF52.5.
[0012] The water reducing agent is a mixture of β-naphthalenesulfonic acid formaldehyde condensate and polyaspartic acid grafted sodium lignin sulfonate in a mass ratio of 3:1.
[0013] The preparation method of the polyaspartic acid grafted sodium lignin sulfonate is as follows: adding a polyaspartic acid solution with a mass concentration of 5-10% to a sodium lignin sulfonate solution with a mass concentration of 5-10%, stirring for 5-10 minutes, adding diphenylmethane diisocyanate as a cross-linking agent, and the mass ratio of diphenylmethane diisocyanate to sodium lignin sulfonate and polyaspartic acid is 2:(1-5):(1-5); after the addition is completed, reacting at 30-60° C. for 5-8 hours; centrifuging the reaction mixture at 4000-7000 rpm for 10-15 minutes, and then dialyzing the product for 60-80 hours using a dialysis bag with a molecular weight cutoff limit of 10000-30000Da, washing the obtained dialyzate 3-5 times and then freeze-drying to obtain a water reducing agent polyaspartic acid grafted sodium lignin sulfonate.
[0014] The preparation method of the mine filling material containing vanadium tailings is carried out according to the following steps: fully stirring and mixing the activated vanadium tailings, modified boron mud, cement, water reducer and water for 3-8 minutes, injecting into a mold, vibrating and exhausting for 1-3 minutes, demolding after 2-5 days, and curing for 18-38 days.
[0015] The curing operation steps are: placing the demoulded filling material into a constant temperature and humidity curing box, with a curing temperature of 18-22° C. and a humidity of 92-97%.
[0016] Beneficial effects of the present invention: the mine filling material containing vanadium tailings of the present invention uses vanadium tailings as the main material, effectively utilizes tailings waste, and turns waste into treasure. Among the components, the vanadium tailings are activated and the boron mud is modified before use, which improves the compressive strength of the filling material. The combined use of water reducer β-naphthalenesulfonic acid formaldehyde condensate and polyaspartic acid grafted lignin sodium sulfonate also improves the compressive strength of the filling material. The combined use of the components is synergistic. Detailed implementation mode
[0017] For the convenience of understanding the present invention, the present invention will be described more comprehensively below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0018] Example 1
[0019] A mine filling material containing vanadium tailings is made from the following raw materials in parts by weight: 45 parts of activated vanadium tailings, 15 parts of modified boron mud, 30 parts of PO42.5 cement, 6 parts of water reducing agent, and 20 parts of water; the water reducing agent is a mixture of β-naphthalene sulfonic acid formaldehyde condensate and sodium polyaspartic acid grafted lignosulfonate mixed in a mass ratio of 3:1.
[0020] The preparation method of the activated vanadium tailings is as follows: Add vanadium tailings into a ball mill tank for ball milling, the rotation speed of the ball mill tank is 2 r / s, and the ball milling time is 30 min; add the ball-milled vanadium tailings into an aqueous solution of Na2SO4, stir and mix well, and then put it into an oven and dry at 50 °C for 1 h; the dosage of Na2SO4 is 5% of the mass of vanadium tailings.
[0021] The preparation method of the modified boron mud is as follows: Stir silane coupling agent KH550 in a water bath at 70 °C for 55 min, then add boron mud and continue to stir for 2 h, and dry at 105 °C.
[0022] The preparation method of the sodium polyaspartic acid grafted lignosulfonate is as follows: Add a polyaspartic acid solution with a mass concentration of 8% into a lignosulfonate solution with a mass concentration of 8%, stir for 8 min, add diphenylmethane diisocyanate as a crosslinking agent, and the mass ratio of diphenylmethane diisocyanate to lignosulfonate and polyaspartic acid is 2:3:3; after the addition, react at 45 °C for 7 h; centrifuge the reaction mixture at 6000 rpm for 12 min, and then use a dialysis bag with a molecular weight cut-off limit of 20000 Da to dialyze the product for 72 h. After washing the obtained dialysate 4 times, freeze-dry it to obtain the water reducing agent sodium polyaspartic acid grafted lignosulfonate.
[0023] The preparation method of the mine filling material containing vanadium tailings is carried out according to the following steps: Stir and mix the activated vanadium tailings, modified boron mud, cement, water reducing agent, and water well for 6 min, then inject them into a mold, vibrate and exhaust for 2 min, demold after 4 d, and put them into a constant temperature and humidity curing box, the curing temperature is 20 °C, the humidity is 95%, and cure for 28 d.
[0024] Example 2
[0025] A mine filling material containing vanadium tailings is made from the following raw materials in parts by weight: 35 parts of activated vanadium tailings, 10 parts of modified boron mud, 20 parts of PO52.5 cement, 3 parts of water reducing agent, and 15 parts of water; the water reducing agent is a mixture of β-naphthalene sulfonic acid formaldehyde condensate and sodium polyaspartate grafted lignosulfonate mixed in a mass ratio of 3:1.
[0026] The preparation method of the activated vanadium tailings is as follows: Add the vanadium tailings into a ball mill tank for ball milling, the rotation speed of the ball mill tank is 1 r / s, and the ball milling time is 40 min; Add the ball-milled vanadium tailings into an aqueous Na2SO4 solution, stir and mix well, and then put it into an oven and dry at 40 °C for 1.5 h; The dosage of Na2SO4 is 3% of the mass of the vanadium tailings.
[0027] The preparation method of the modified boron mud is as follows: Stir the silane coupling agent KH570 in a water bath at 65 °C for 60 min, then add the boron mud and continue to stir for 1 h, and dry at 100 °C.
[0028] The preparation method of the sodium polyaspartate grafted lignosulfonate is as follows: Add a 5% polyaspartic acid solution by mass to a 5% sodium lignosulfonate solution by mass, stir for 5 min, add diphenylmethane diisocyanate as a crosslinking agent, and the mass ratio of diphenylmethane diisocyanate to sodium lignosulfonate and polyaspartic acid is 2:5:5; After the addition, react at 40 °C for 8 h; Centrifuge the reaction mixture at 4000 rpm for 15 min, and then use a dialysis bag with a molecular weight cut-off limit of 12000 Da to dialyze the product for 60 h. Wash the obtained dialysate 3 times and then freeze-dry to obtain the water reducing agent sodium polyaspartate grafted lignosulfonate.
[0029] The preparation method of the mine filling material containing vanadium tailings is carried out according to the following steps: Stir and mix the activated vanadium tailings, modified boron mud, cement, water reducing agent, and water well for 3 min, then inject them into a mold, vibrate and exhaust for 3 min, demold after 2 d, and put them into a constant temperature and humidity curing box. The curing temperature is 18 °C and the humidity is 92%, and cure for 38 d.
[0030] Example 3
[0031] A mine filling material containing vanadium tailings is made from the following raw materials in parts by weight: 60 parts of activated vanadium tailings, 20 parts of modified boron mud, 40 parts of PF42.5 cement, 8 parts of water reducing agent, and 25 parts of water; the water reducing agent is a mixture of β-naphthalene sulfonic acid formaldehyde condensate and sodium polyaspartate grafted lignosulfonate mixed in a mass ratio of 3:1.
[0032] The preparation method of the activated vanadium tailings is as follows: Add the vanadium tailings into a ball mill jar for ball milling. The rotation speed of the ball mill jar is 2 r / s, and the ball milling time is 20 min. Add the ball-milled vanadium tailings into an aqueous Na2SO4 solution, stir and mix well, and then put it into an oven to dry at 60 °C for 0.5 h. The dosage of Na2SO4 is 7% of the mass of the vanadium tailings.
[0033] The preparation method of the modified boron mud is as follows: Stir the silane coupling agent KH590 in a water bath at 75 °C for 50 min, then add the boron mud and continue to stir for 3 h, and dry at 1110 °C.
[0034] The preparation method of the polyaspartic acid grafted sodium lignosulfonate is as follows: Add a 10% polyaspartic acid solution by mass to a 10% sodium lignosulfonate solution by mass, stir for 10 min, add diphenylmethane diisocyanate as a crosslinking agent. The mass ratio of diphenylmethane diisocyanate to sodium lignosulfonate and polyaspartic acid is 2:1:1. After the addition, react at 60 °C for 5 h. Centrifuge the reaction mixture at 7000 rpm for 10 min, then use a dialysis bag with a molecular weight cut-off limit of 25000 Da to dialyze the product for 80 h. Wash the obtained dialysate 5 times and then freeze-dry to obtain the water reducer polyaspartic acid grafted sodium lignosulfonate.
[0035] The preparation method of the vanadium tailings-containing mine filling material is carried out according to the following steps: Stir and mix the activated vanadium tailings, modified boron mud, cement, water reducer, and water well for 8 min, then inject them into a mold, vibrate and exhaust for 1 min, demold after 5 d, and put them into a constant temperature and humidity curing box. The curing temperature is 22 °C, the humidity is 97%, and cure for 25 d.
[0036] Comparative Example 1
[0037] A vanadium tailings-containing mine filling material is made from the following raw materials in parts by weight: 60 parts of activated vanadium tailings, 30 parts of PO42.5 cement, 6 parts of water reducer, and 20 parts of water; the water reducer is a mixture of β-naphthalene sulfonic acid formaldehyde condensate and polyaspartic acid grafted sodium lignosulfonate mixed in a mass ratio of 3:1.
[0038] The preparation method of the activated vanadium tailings is as follows: Add the vanadium tailings into a ball mill jar for ball milling. The rotation speed of the ball mill jar is 2 r / s, and the ball milling time is 30 min. Add the ball-milled vanadium tailings into an aqueous Na2SO4 solution, stir and mix well, and then put it into an oven to dry at 50 °C for 1 h. The dosage of Na2SO4 is 5% of the mass of the vanadium tailings.
[0039] The preparation method of the polyaspartic acid grafted sodium lignin sulfonate is as follows: adding a polyaspartic acid solution with a mass concentration of 8% to a sodium lignin sulfonate solution with a mass concentration of 8%, stirring for 8 minutes, adding diphenylmethane diisocyanate as a cross-linking agent, and the mass ratio of diphenylmethane diisocyanate to sodium lignin sulfonate and polyaspartic acid is 2:3:3; after the addition is completed, reacting at 45°C for 7 hours; centrifuging the reaction mixture at 6000rpm for 12 minutes, and then dialyzing the product for 72 hours using a dialysis bag with a molecular weight cutoff limit of 20000Da, washing the obtained dialyzate 4 times and then freeze-drying to obtain a water reducer polyaspartic acid grafted sodium lignin sulfonate.
[0040] The preparation method of the mine filling material containing vanadium tailings is carried out according to the following steps: the activated vanadium tailings, cement, water reducer and water are fully stirred and mixed for 6 minutes, then injected into a mold, vibrated and exhausted for 2 minutes, demolded after 4 days, and placed in a constant temperature and humidity curing box with a curing temperature of 20° C. and a humidity of 95% for 28 days.
[0041] Comparative Example 2
[0042] A mine filling material is made of the following raw materials in parts by weight: 60 parts of modified boric mud, 30 parts of PO42.5 cement, 6 parts of water reducer, and 20 parts of water; the water reducer is a mixture of β-naphthalenesulfonic acid formaldehyde condensate and polyaspartic acid grafted sodium lignin sulfonate in a mass ratio of 3:1.
[0043] The preparation method of the modified boron mud is as follows: after stirring the silane coupling agent KH550 in a 70° C. water bath for 55 minutes, adding the boron mud and continuing to stir for 2 hours, and drying at 105° C.
[0044] The preparation method of the polyaspartic acid grafted sodium lignin sulfonate is as follows: adding a polyaspartic acid solution with a mass concentration of 8% to a sodium lignin sulfonate solution with a mass concentration of 8%, stirring for 8 minutes, adding diphenylmethane diisocyanate as a cross-linking agent, and the mass ratio of diphenylmethane diisocyanate to sodium lignin sulfonate and polyaspartic acid is 2:3:3; after the addition is completed, reacting at 45°C for 7 hours; centrifuging the reaction mixture at 6000rpm for 12 minutes, and then dialyzing the product for 72 hours using a dialysis bag with a molecular weight cutoff limit of 20000Da, washing the obtained dialyzate 4 times and then freeze-drying to obtain a water reducer polyaspartic acid grafted sodium lignin sulfonate.
[0045] The preparation method of the mine filling material containing vanadium tailings is carried out according to the following steps: modified boron mud, cement, water reducer and water are fully stirred and mixed for 6 minutes, then injected into a mold, vibrated and exhausted for 2 minutes, demolded after 4 days, and placed in a constant temperature and humidity curing box with a curing temperature of 20°C and a humidity of 95% for 28 days.
[0046] Comparative Example 3
[0047] A mine filling material containing vanadium tailings is made from raw materials in the following weight parts: 45 parts of vanadium tailings, 15 parts of boron mud, 30 parts of PO42.5 cement, 6 parts of water reducing agent, and 20 parts of water; the water reducing agent is a mixture of β-naphthalene sulfonic acid formaldehyde condensate and polyaspartic acid grafted lignosulfonate sodium in a mass ratio of 3:1.
[0048] The preparation method of the polyaspartic acid grafted lignosulfonate sodium is as follows: Add a polyaspartic acid solution with a mass concentration of 8% to a lignosulfonate sodium solution with a mass concentration of 8%, stir for 8 min, add diphenylmethane diisocyanate as a crosslinking agent, and the mass ratio of diphenylmethane diisocyanate to lignosulfonate sodium and polyaspartic acid is 2:3:3; after the addition, react at 45 °C for 7 h; centrifuge the reaction mixture at 6000 rpm for 12 min, and then dialyze the product using a dialysis bag with a molecular weight cut-off limit of 20000 Da for 72 h. Wash the obtained dialysate 4 times and then freeze-dry to obtain the water reducing agent polyaspartic acid grafted lignosulfonate sodium.
[0049] The preparation method of the mine filling material containing vanadium tailings is carried out according to the following steps: Fully stir and mix the activated vanadium tailings, modified boron mud, cement, water reducing agent, and water for 6 min, then inject them into a mold, vibrate to exhaust for 2 min, demold after 4 d, and place them in a constant temperature and humidity curing box. The curing temperature is 20 °C and the humidity is 95%, and cure for 28 d.
[0050] Comparative Example 4
[0051] A mine filling material containing vanadium tailings is made from raw materials in the following weight parts: 45 parts of activated vanadium tailings, 15 parts of modified boron mud, 30 parts of PO42.5 cement, 6 parts of β-naphthalene sulfonic acid formaldehyde condensate, and 20 parts of water.
[0052] The preparation method of the activated vanadium tailings is as follows: Add the vanadium tailings to a ball mill tank for ball milling. The rotation speed of the ball mill tank is 2 r / s and the ball milling time is 30 min; add the ball-milled vanadium tailings to an aqueous Na2SO4 solution and stir and mix well, then put them in an oven and dry at 50 °C for 1 h; the dosage of Na2SO4 is 5% of the mass of the vanadium tailings.
[0053] The preparation method of the modified boron mud is as follows: Stir the silane coupling agent KH550 in a water bath at 70 °C for 55 min, then add the boron mud and continue to stir for 2 h, and dry at 105 °C.
[0054] The preparation method of the mine filling material containing vanadium tailings is carried out according to the following steps: the activated vanadium tailings, modified boron mud, cement, β-naphthalenesulfonic acid formaldehyde condensate and water are fully stirred and mixed for 6 minutes, then injected into a mold, vibrated and exhausted for 2 minutes, demolded after 4 days, and placed in a constant temperature and humidity curing box with a curing temperature of 20°C and a humidity of 95% for 28 days.
[0055] Comparative Example 5
[0056] A mine filling material containing vanadium tailings is prepared from the following raw materials in parts by weight: 45 parts of activated vanadium tailings, 15 parts of modified boron mud, 30 parts of PO42.5 cement, 6 parts of polyaspartic acid grafted sodium lignin sulfonate, and 20 parts of water.
[0057] The preparation method of the activated vanadium tailings is as follows: adding the vanadium tailings into a ball mill for ball milling, the speed of the ball mill is 2r / s, and the ball milling time is 30min; adding the ball-milled vanadium tailings into a Na2SO4 aqueous solution and stirring and mixing them fully, and then putting them into an oven for drying at 50°C for 1h; the amount of Na2SO4 used is 5% of the mass of the vanadium tailings.
[0058] The preparation method of the modified boron mud is as follows: after stirring the silane coupling agent KH550 in a 70° C. water bath for 55 minutes, adding the boron mud and continuing to stir for 2 hours, and drying at 105° C.
[0059] The preparation method of the polyaspartic acid grafted sodium lignin sulfonate is as follows: adding a polyaspartic acid solution with a mass concentration of 8% to a sodium lignin sulfonate solution with a mass concentration of 8%, stirring for 8 minutes, adding diphenylmethane diisocyanate as a cross-linking agent, and the mass ratio of diphenylmethane diisocyanate to sodium lignin sulfonate and polyaspartic acid is 2:3:3; after the addition is completed, reacting at 45°C for 7 hours; centrifuging the reaction mixture at 6000rpm for 12 minutes, and then dialyzing the product for 72 hours using a dialysis bag with a molecular weight cutoff limit of 20000Da, washing the obtained dialyzate 4 times and then freeze-drying to obtain a water reducer polyaspartic acid grafted sodium lignin sulfonate.
[0060] The preparation method of the mine filling material containing vanadium tailings is carried out according to the following steps: the activated vanadium tailings, modified boron mud, cement, polyaspartic acid grafted sodium lignin sulfonate and water are fully stirred and mixed for 6 minutes, then injected into a mold, vibrated and exhausted for 2 minutes, demolded after 4 days, and placed in a constant temperature and humidity curing box with a curing temperature of 20°C and a humidity of 95% for 28 days.
[0061] Experimental example:
[0062] The WDW-50 microcomputer-controlled electronic universal testing machine was used to test the compressive strength of the mine filling materials prepared in Examples 1-3 and Comparative Examples 1-5. The experimental results were statistically analyzed using SPSS 24.0 software. The measurement data results were expressed as (mean ± standard deviation). The Kolmogorov-Smirnov test method was used for data normality test. For data that conform to the normal distribution, the t-test was used to compare the mean differences between the two groups. A P < 0.05 was considered statistically significant. The measurement results are shown in Table 1:
[0063] Table 1
[0064]
[0065]
[0066] Note: * represents P < 0.05 compared with the Example 1 group.
[0067] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.
Claims
1. A mine filling material for vanadium-containing tailings, characterized in that, It is made from the following raw materials in parts by weight: 30 - 60 parts of activated vanadium tailings, 10 - 20 parts of modified boron mud, 20 - 40 parts of cement, 3 - 8 parts of water reducer, and 15 - 25 parts of water.
2. The mine filling material containing vanadium tailings according to claim 1, characterized in that, The preparation method of the activated vanadium tailings is as follows: Add the vanadium tailings into a ball mill tank for ball milling, the rotation speed of the ball mill tank is 1 - 2 r / s, and the ball milling time is 20 - 40 min; Add the ball - milled vanadium tailings into an aqueous Na2SO4 solution, stir and mix well, and then put it into an oven to dry at 40 - 60 °C for 0.5 - 1.5 h.
3. The mine filling material containing vanadium tailings according to claim 2, characterized in that, The dosage of the Na2SO4 is 3 - 7% of the mass of the vanadium tailings.
4. The mine filling material containing vanadium tailings according to claim 1, characterized in that, The preparation method of the modified boron mud is as follows: Stir the silane coupling agent in a water bath at 65 - 75 °C for 50 - 60 min, then add the boron mud and continue to stir for 1 - 3 h, and dry at 100 - 110 °C.
5. The mine filling material containing vanadium tailings according to claim 4, characterized in that, The silane coupling agent is one or several of KH550, KH570, KH590, and kh792.
6. The mine filling material containing vanadium tailings according to claim 1, characterized in that, The cement is one or several of PO42.5, PO52.5, PF42.5, and PF52.
5.
7. The mine filling material containing vanadium tailings according to claim 1, characterized in that, The water reducer is a mixture of β - naphthalene sulfonic acid formaldehyde condensate and sodium polyaspartate - grafted lignosulfonate mixed in a mass ratio of 3:
1.
8. The mine filling material containing vanadium tailings according to claim 7, characterized in that, The preparation method of the sodium polyaspartate - grafted lignosulfonate is as follows: Add a polyaspartic acid solution with a mass concentration of 5 - 10% into a sodium lignosulfonate solution with a mass concentration of 5 - 10%, stir for 5 - 10 min, add diphenylmethane diisocyanate as a cross - linker, and the mass ratio of diphenylmethane diisocyanate to sodium lignosulfonate and polyaspartic acid is 2:(1 - 5):(1 - 5); After the addition, react at 30 - 60 °C for 5 - 8 h; Centrifuge the reaction mixture at 4000 - 7000 rpm for 10 - 15 min, then use a dialysis bag with a molecular weight cut - off limit of 10000 - 30000 Da to dialyze the product for 60 - 80 h, wash the obtained dialysate 3 - 5 times and then freeze - dry to obtain the water reducer sodium polyaspartate - grafted lignosulfonate.
9. The preparation method of the mine filling material containing vanadium tailings according to claim 1, characterized in that, It is carried out according to the following steps: Stir and mix the activated vanadium tailings, modified boron mud, cement, water reducer, and water well for 3 - 8 min, then inject them into a mold, vibrate to exhaust for 1 - 3 min, demold after 2 - 5 d, and cure for 18 - 38 d.
10. The preparation method of the mine filling material containing vanadium tailings according to claim 9, characterized in that, The operation steps of the curing are as follows: Put the demolded filling material into a constant - temperature and constant - humidity curing box, the curing temperature is 18 - 22 °C, and the humidity is 92 - 97%.