Solid waste-based reinforcing material for well cementation cement and preparation method of solid waste-based reinforcing material

Abstract

The invention discloses a solid waste-based reinforcing material for well cementation cement and a preparation method thereof, the reinforcing material comprises, by weight, 10-20% of an active component A, 60% of an active component B and 20-30% of a reinforcing component, and the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste according to a mass ratio of (3-5): 4: 1 and reacting. The solid-waste-based reinforcing material is prepared by selecting a large amount of solid waste as a raw material, is beneficial to reducing environmental pressure, has the characteristics of environmental protection, low cost and the like, can be used in a low-temperature environment, can improve the early strength and anti-channeling capability of well cementation cement stone, and has good adaptability to oil well cement.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas resource development, and in particular to a solid waste-based reinforcing material for cementing and a preparation method thereof. Background Art

[0002] With the rapid development of industrialization and urbanization, the amount of solid waste generated continues to increase, posing a huge challenge to environmental protection and sustainable development. Therefore, it is of great significance to carry out research on industrial solid waste collection, treatment and resource utilization technology and its application. Among them, the development and application of resource utilization technology can transform solid waste into renewable resources and realize recycling, but it is constrained by objective economic conditions, which seriously restricts the efficiency of industrial solid waste resource utilization technology. The coordinated treatment of multi-source solid waste to prepare functional materials is one of the new ideas for the resource utilization of solid waste.

[0003] China is rich in offshore oil and gas resources and has great potential for exploration and development. Vigorously developing offshore oil and gas resources will help promote and increase my country's oil production and provide a strong energy guarantee for the sustained and healthy growth of China's economy. In the future, the development of oil energy will gradually move from shallow water to deep water, so the research and development of deepwater oil and gas extraction technology is particularly important. The low temperature environment faced by deepwater cementing seriously delays the hydration of oil well cement, resulting in a long waiting time. At present, adding early strength agents is the main method to shorten the cement setting time and improve the early strength of cement stone in low-temperature cementing. However, most early strength agents have problems such as poor early strength effect and poor engineering properties such as cement slurry fluidity, which are difficult to meet the requirements of deepwater cementing. Therefore, it is of great significance to develop new low-temperature early strength materials in deepwater low-temperature cementing. Summary of the invention

[0004] In order to overcome the above technical difficulties of low-temperature cementing slurry, the present invention provides a solid waste-based reinforcing material for cementing cement and a preparation method thereof.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] On the one hand, the present invention provides a solid waste-based reinforcing material for cementing cement, comprising the following raw materials in weight percentage: 10-20wt% active component A, 60wt% active component B and 20-30wt% reinforcing component, wherein the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of (3-5):4:1.

[0007] Furthermore, the preparation method of the active component A is as follows:

[0008] Sa1, carbide slag, biomass slag and aerated concrete waste are placed in a ball mill according to a mass ratio of (3-5):4:1 and wet-grinded with a liquid-to-solid ratio of 0.8 to 1.2 to obtain slurry A;

[0009] Sa2, placing slurry A in a sealed stirring tank, adding a dispersion stabilizer in an amount of 1 wt% of the solid mass in slurry A and stirring to obtain slurry B;

[0010] Sa3, placing slurry B in a centrifugal device for liquid-solid separation, drying the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A;

[0011] Preferably, the wet grinding speed in Sa1 is 300-500 rpm, and the wet grinding time is 72 h;

[0012] Preferably, the stirring temperature in Sa2 is 60-80° C., and the stirring time is 48-72 h.

[0013] Furthermore, the dispersion stabilizer is a mixture of ketone-aldehyde condensate and microcrystalline cellulose.

[0014] Furthermore, the carbide slag has a CaO content of 65-70wt% and a pH of 12-13.

[0015] Furthermore, the biomass slag has a SiO2 content of ≥65wt%, an Al2O3 content of ≥15wt%, and a particle size of less than 325 meshes.

[0016] Furthermore, the aerated concrete waste is composed of tobermorite, semi-crystalline CSH (I), CSH gel and silicon dioxide, and after being crushed and ground, the powder fineness is less than 600 meshes.

[0017] Furthermore, the active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:(1-2);

[0018] Preferably, the SiO2 content of the modified zirconium-silicon slag is ≥90wt%, the pH is neutral, and the powder particle size is less than 325 mesh;

[0019] Preferably, the powder particle size of the silicon-manganese slag is less than 325 mesh, the SiO2 content is 35-40wt%, the Al2O3 content is 9-12wt%, the CaO content is 25-28wt%, and the MgO content is 6-11wt%;

[0020] Preferably, the SiO2 content of the phosphorus slag is 35-40wt%, and the CaO content is 42-48wt%;

[0021] Preferably, the alkali residue has a CaCO3 content of 40-45wt%, a CaSO4 content of 7-10wt%, and a CaCl2 content of 10-14wt%.

[0022] Furthermore, the modified zirconium-silicon slag is prepared from zirconium-silicon slag into slurry C, which is neutralized, washed with water, and impurity-removed before solid-liquid separation, and then dried at high temperature and ground to obtain a product.

[0023] Furthermore, the reinforcing components are lithium silicate and aluminum sulfate mixed in a mass ratio of 1:2;

[0024] Preferably, the purity of the lithium silicate is greater than 98wt%;

[0025] Preferably, the purity of the aluminum sulfate is greater than 98 wt%.

[0026] In another aspect, the present invention provides a method for preparing a solid waste-based reinforcing material for cementing cement, comprising the following steps:

[0027] S1, mixing the active component A and the reinforcing component to obtain powder A;

[0028] S2, placing active component B in a ball mill to obtain powder B;

[0029] S3, pneumatically mixing powder A and powder B to obtain a solid waste-based reinforcement material for cementing cement;

[0030] Preferably, in S2, the ball milling speed is 300-500 rpm, and the ball milling time is 5-8 h. More preferably, the ball milling speed is 500 rpm, and the ball milling time is 6 h.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention uses solid waste as raw material for preparation, which helps to reduce environmental pressure and has the characteristics of green environmental protection and low cost. The present invention realizes the comprehensive utilization of solid wastes such as zirconium silicon slag, silicon manganese slag and biomass slag, increases the solid waste disposal capacity, and reduces the waste of land resources and environmental pollution caused by solid waste storage.

[0033] 2. The solid waste-based reinforcing material for cementing cement of the present invention can be used to improve the early strength and anti-channeling ability of cementing cement stone in a low temperature environment and has good adaptability to oil well cement.

[0034] 3. The active component A of the solid waste-based reinforcing material for cementing cement of the present invention utilizes carbide slag, biomass slag and aerated concrete waste to react under wet grinding conditions to generate calcium silicate hydrate and calcium aluminosilicate hydrate. The aerated concrete waste contains a large amount of tobermorite, which can serve as a nucleation site for calcium silicate and calcium aluminosilicate hydrate, greatly accelerating the formation of calcium silicate hydrate and calcium aluminosilicate hydrate and promoting cement hydration reaction.

[0035] 4. The solid waste-based reinforcing material for cementing cement of the present invention can provide an alkaline environment for the initial hydration reaction of cement, which can promote the hydration reaction of cement on the one hand; on the other hand, it can stimulate the activity of active component B, promote the activation and decomposition of solid waste residue in active component B, and promote Si 4+ 、Al 3+ and Ca 2+ Plasma release accelerates the formation of hydration products. In addition, the active component A in the present invention can act as calcium silicate hydrate and calcium aluminosilicate hydrate crystal seeds in the early stage of hydration, provide a good nucleus effect in the cement hydration process, induce the formation of calcium silicate hydrate and calcium aluminosilicate hydrate in the cement hydration process, promote cement hydration and thus improve the early strength of cement.

[0036] 5. The active component B in the solid waste-based reinforcing material for cementing cement of the present invention contains a large amount of amorphous SiO2 particles, which are highly active and can quickly react with the cement hydration product Ca(OH)2 to accelerate cement hydration; at the same time, the active component B also contains a small amount of MgO and CaSO4, which can promote the crystallization of calcium sulfoxide through synergistic effects with the reinforcing components on the one hand, and on the other hand, can form Mg(OH)2 during the cement hydration process, thereby enhancing the cementitiousness and sealing properties of the cementing cement stone, thereby improving the anti-channeling ability of the cementing cement stone.

[0037] 6. The reinforcing component in the solid waste-based reinforcing material for cementing cement of the present invention can react with free hydroxide ions (OH - ) and calcium ions (Ca 2+ ) reaction to generate silicate gel and calcium silicate, which fill the micropores and gaps of the hydration product, thereby improving the density of the matrix. The generated silicate gel and calcium silicate further promote the formation of hydrated calcium silicate and hydrated calcium aluminosilicate through synergistic reinforcement with the active component A; the reinforcement component can also promote the crystallization of ettringite together with the various ions released by the active component B. 4+ 、Al 3+ and Ca 2+ The consumption of plasma further promotes the hydration of cement and the dissociation and activity release of active component B, thereby promoting the formation of early strength. +It accelerates the destruction of the early hydration product film covering the cement particles and speeds up the hydration process; and the cement hydration product Ca(OH)2 formed can stimulate the activity of solid waste-based reinforcing materials for cementing cement, react with them, and promote the occurrence of hydration reactions. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] The following examples and comparative examples are all prepared according to GB / T19139 standard for cement slurry, wherein the G-grade oil well cement is provided by Jiahua Special Cement Co., Ltd. The solid waste-based reinforcement material for cementing well is prepared according to the following steps:

[0040] S1, mixing the active component A and the reinforcing component to obtain powder A;

[0041] S2, placing active component B in a ball mill, the ball milling speed is 500 rpm, the ball milling time is 6 hours, and powder B is obtained;

[0042] S3. Powder A and powder B are pneumatically mixed by a pneumatic mixing device to obtain a solid waste-based reinforcement material for cementing cement.

[0043] Example 1

[0044] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcement material for cementing cement in this embodiment is shown in Table 1 below:

[0045] Table 1

[0046] raw material Weight ratio (wt%) Active ingredient A 10 Active ingredient B 60 Reinforcement components 30

[0047] In this embodiment, the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0048] In this embodiment, the preparation method of active component A is as follows:

[0049] Sa1, carbide slag, biomass slag and aerated concrete waste were placed in a ball mill in a mass ratio of 5:4:1 and wet-milled at a speed of 400 rpm, a wet-milling time of 72 h, and a liquid-to-solid ratio of 1.0 to obtain slurry A;

[0050] Sa2, placing slurry A in a sealed stirring tank, adding 1 wt% of the solid mass of the dispersion stabilizer in slurry A and stirring at 80°C for 72 h to obtain slurry B;

[0051] Sa3. Place slurry B in a centrifugal device for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0052] In this embodiment, the active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:1.

[0053] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0054] The above raw materials are prepared according to the proportions in Table 1 and the relevant steps of the method for preparing a solid waste-based reinforcing material for cementing cement provided by the present invention to obtain a solid waste-based reinforcing material 1# for cementing cement.

[0055] Example 2

[0056] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcement material for cementing cement in this embodiment is shown in Table 2 below:

[0057] Table 2

[0058]

[0059]

[0060] In this embodiment, the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0061] In this embodiment, the preparation method of active component A is as follows:

[0062] Sa1, carbide slag, biomass slag and aerated concrete waste were placed in a ball mill in a mass ratio of 5:4:1 and wet-milled at a speed of 400 rpm, a wet-milling time of 72 h, and a liquid-to-solid ratio of 1.0 to obtain slurry A;

[0063] Sa2, placing slurry A in a sealed stirring tank, adding 1 wt% of the solid mass of the dispersion stabilizer in slurry A and stirring at 80°C for 72 h to obtain slurry B;

[0064] Sa3. Place slurry B in a centrifugal device for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0065] In this embodiment, the active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:1.

[0066] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0067] The above raw materials were prepared according to the proportions in Table 2 and the relevant steps of the method for preparing a solid waste-based reinforcing material for cementing cement provided by the present invention to obtain a solid waste-based reinforcing material 2# for cementing cement.

[0068] Example 3

[0069] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcement material for cementing cement in this embodiment is shown in Table 3 below:

[0070] Table 3

[0071] raw material Weight ratio (wt%) Active ingredient A 20 Active ingredient B 60 Reinforcement components 20

[0072] In this embodiment, the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0073] In this embodiment, the preparation method of active component A is as follows:

[0074] Sa1, carbide slag, biomass slag and aerated concrete waste were placed in a ball mill in a mass ratio of 5:4:1 and wet-milled at a speed of 400 rpm, a wet-milling time of 72 h, and a liquid-to-solid ratio of 1.0 to obtain slurry A;

[0075] Sa2, placing slurry A in a sealed stirring tank, adding 1 wt% of the solid mass of the dispersion stabilizer in slurry A and stirring at 80°C for 72 h to obtain slurry B;

[0076] Sa3. Place slurry B in a centrifugal device for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0077] In this embodiment, the active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:1.

[0078] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0079] The above raw materials were prepared according to the proportions in Table 3 and the relevant steps of the method for preparing a solid waste-based reinforcing material for cementing cement provided by the present invention to obtain a solid waste-based reinforcing material 3# for cementing cement.

[0080] Example 4

[0081] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcement material for cementing cement in this embodiment is shown in Table 4 below:

[0082] Table 4

[0083] raw material Weight ratio (wt%) Active ingredient A 20 Active ingredient B 60 Reinforcement components 20

[0084] In this embodiment, the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0085] In this embodiment, the preparation method of active component A is as follows:

[0086] Sa1, carbide slag, biomass slag and aerated concrete waste were placed in a ball mill in a mass ratio of 5:4:1 and wet-milled at a speed of 400 rpm, a wet-milling time of 72 h, and a liquid-to-solid ratio of 1.0 to obtain slurry A;

[0087] Sa2, placing slurry A in a sealed stirring tank, adding 1 wt% of the solid mass of the dispersion stabilizer in slurry A and stirring at 80°C for 72 h to obtain slurry B;

[0088] Sa3. Place slurry B in a centrifugal device for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0089] In this embodiment, the active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:2.

[0090] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0091] The above raw materials were prepared according to the proportions in Table 4 and the relevant steps of the method for preparing a solid waste-based reinforcing material for cementing cement provided by the present invention to obtain a solid waste-based reinforcing material 4# for cementing cement.

[0092] Example 5

[0093] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcement material for cementing cement in this embodiment is shown in Table 5 below:

[0094] Table 5

[0095] raw material Weight ratio (wt%) Active ingredient A 20 Active ingredient B 60 Reinforcement components 20

[0096] In this embodiment, the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of 3:4:1.

[0097] In this embodiment, the preparation method of active component A is as follows:

[0098] Sa1, carbide slag, biomass slag and aerated concrete waste are placed in a ball mill in a mass ratio of 3:4:1 and wet-milled at a speed of 400 rpm, a wet-milling time of 72 h, and a liquid-to-solid ratio of 1.0 to obtain slurry A;

[0099] Sa2, placing slurry A in a sealed stirring tank, adding 1 wt% of the solid mass of the dispersion stabilizer in slurry A and stirring at 80°C for 72 h to obtain slurry B;

[0100] Sa3. Place slurry B in a centrifugal device for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0101] In this embodiment, the active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:1.

[0102] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0103] The above raw materials were prepared according to the proportions in Table 5 and the relevant steps of the method for preparing a solid waste-based reinforcing material for cementing cement provided by the present invention to obtain a solid waste-based reinforcing material 5# for cementing cement.

[0104] Example 6

[0105] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcement material for cementing cement in this embodiment is shown in Table 6 below:

[0106] Table 6

[0107] raw material Weight ratio (wt%) Active ingredient A 20 Active ingredient B 60 Reinforcement components 20

[0108] In this embodiment, the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0109] In this embodiment, the preparation method of active component A is as follows:

[0110] Sa1, carbide slag, biomass slag and aerated concrete waste were placed in a ball mill in a mass ratio of 5:4:1 and wet-milled at a speed of 300 rpm, a wet-milling time of 72 h, and a liquid-to-solid ratio of 0.8 to obtain slurry A;

[0111] Sa2, placing slurry A in a sealed stirring tank, adding 1 wt% of the solid mass of the dispersion stabilizer in slurry A and stirring at 60° C. for 60 h to obtain slurry B;

[0112] Sa3. Place slurry B in a centrifugal device for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0113] In this embodiment, the active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:1.

[0114] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0115] The above raw materials were prepared according to the proportions in Table 6 and the relevant steps of the method for preparing a solid waste-based reinforcing material for cementing cement provided by the present invention to obtain a solid waste-based reinforcing material 6# for cementing cement.

[0116] Example 7

[0117] As a preferred embodiment of the present invention, the specific composition of the solid waste-based reinforcement material for cementing cement in this embodiment is shown in Table 7 below:

[0118] Table 7

[0119] raw material Weight ratio (wt%) Active ingredient A 20 Active ingredient B 60 Reinforcement components 20

[0120] In this embodiment, the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of 5:4:1.

[0121] In this embodiment, the preparation method of active component A is as follows:

[0122] Sa1, carbide slag, biomass slag and aerated concrete waste were placed in a ball mill in a mass ratio of 5:4:1 and wet-milled at a speed of 500 rpm, a wet-milling time of 72 h, and a liquid-to-solid ratio of 1.2 to obtain slurry A;

[0123] Sa2, placing slurry A in a sealed stirring tank, adding 1 wt% of the solid mass of the dispersion stabilizer in slurry A and stirring at 70°C for 48 hours to obtain slurry B;

[0124] Sa3. Place slurry B in a centrifugal device for liquid-solid separation, and dry the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A.

[0125] In this embodiment, the active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:1.

[0126] In this embodiment, the reinforcing components lithium silicate and aluminum sulfate are mixed in a mass ratio of 1:2.

[0127] The above raw materials were prepared according to the proportions in Table 7 and the relevant steps of the method for preparing the solid waste-based reinforcing material for cementing cement provided by the present invention to obtain the solid waste-based reinforcing material 7# for cementing cement.

[0128] Comparative Example 1

[0129] This comparative example is a blank group without adding any early strength additive (ie, the solid waste-based reinforcing material of the present invention).

[0130] Comparative Example 2

[0131] This comparative example is the same as Example 1 except that the active component A does not contain aerated concrete waste.

[0132] Comparative Example 3

[0133] This comparative example is the same as Example 1 except that the active component B does not contain alkaline residue.

[0134] Comparative Example 4

[0135] This comparative example is the same as Example 1 except that the active component B does not contain silicomanganese slag.

[0136] Comparative Example 5

[0137] This comparative example is the same as Example 1 except that the reinforcing component does not contain lithium silicate.

[0138] Test Case

[0139] The amount of solid waste-based reinforcing materials in Examples 1 to 7 and Comparative Examples 2 to 5 is 5wt% of the mass of G-grade oil well cement. Comparative Example 1 is to prepare cement slurry in accordance with GB / T 19139-2003 standard without adding any early strength additive (i.e., solid waste-based reinforcing materials), and the water-cement ratio is 0.44. The engineering performance tests such as water loss, fluidity, anti-channeling coefficient, thickening time and compressive strength of each cement slurry at different curing temperatures are tested, and the results are shown in Tables 8 and 9, respectively.

[0140] Table 8

[0141]

[0142] According to the data in Table 8, it can be concluded that the water loss and fluidity of the cement slurries prepared in Examples 1 to 7 can well meet the construction requirements, and the thickening time of the slurries is greatly shortened, indicating that the present invention can well adapt to the cement slurry and does not affect the construction performance of the cement slurry; the SPN value for evaluating the anti-gas channeling performance of the cement slurry shows that the reinforcing material of the present invention can reduce the SPN value and improve the anti-gas channeling property of the cement slurry. It can be seen from the data of Comparative Examples 2 to 5 that the various data of Comparative Examples 2 to 5 are better than those of Comparative Example 1, but compared with Example 1, the thickening time of the cement slurries of Comparative Examples 2 to 5 is greatly prolonged, and the anti-gas channeling ability of the slurry is greatly reduced.

[0143] Table 9

[0144]

[0145] From the data in Table 9, it can be seen that the reinforcing material of the present invention can significantly improve the compressive strength of G-grade oil well cement under low temperature conditions, indicating that the reinforcing material of the present invention has excellent low-temperature early strength effect, which is beneficial to shorten the cementing waiting time of shallow oil and gas wells. The compressive strength of the cement paste formed by Comparative Examples 2 to 5 is much greater than that of Comparative Example 1, but the compressive strength is significantly reduced compared with Example 1, indicating that the low-temperature early strength effect of the reinforcing materials formed by Comparative Examples 2 to 5 is weaker.

[0146] It can be seen from the above embodiments that the technical solution of the present invention is adopted, and after adding the solid waste-based reinforcing material for cementing cement of the present invention, the construction performance of the cement slurry is not affected, and the early hydration process of cement can be significantly promoted, and the strength development rate of cement slurry is greatly improved, which is beneficial to prevent low-temperature shallow water and gas channeling and improve cementing quality. In addition, the components in the reinforcing material of the present invention have a synergistic effect, and the lack of any one of them cannot achieve the expected effect of the present application.

[0147] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, rather than limiting them, and certainly not limiting the patent scope of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In other words, any changes or modifications made to the main design concept and spirit of the present invention that have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A solid waste-based reinforcing material for cementing, characterized in that: The invention comprises the following raw materials in weight percentage: 10-20wt% active component A, 60wt% active component B and 20-30wt% reinforcing component, wherein the active component A is prepared by mixing carbide slag, biomass slag and aerated concrete waste in a mass ratio of (3-5):4:

1.

2. The solid waste-based reinforcing material for cementing cement according to claim 1, characterized in that: The preparation method of the active component A is as follows: Sa1, carbide slag, biomass slag and aerated concrete waste are placed in a ball mill according to a mass ratio of (3-5):4:1 and wet-grinded at a liquid-to-solid ratio of 0.8 to 1.2 to obtain slurry A; Sa2, placing slurry A in a sealed stirring tank, adding a dispersion stabilizer in an amount of 1 wt% of the solid mass in slurry A and stirring to obtain slurry B; Sa3, placing slurry B in a centrifugal device for liquid-solid separation, drying the solid phase at the bottom of the liquid-solid separation into dry powder to obtain active component A; Preferably, the wet grinding speed in Sa1 is 300-500 rpm, and the wet grinding time is 72 h; Preferably, the stirring temperature in Sa2 is 60-80° C., and the stirring time is 48-72 h.

3. The solid waste-based reinforcing material for cementing cement according to claim 2, characterized in that: The dispersion stabilizer is a mixture of ketone-aldehyde condensate and microcrystalline cellulose.

4. The solid waste-based reinforcing material for cementing according to claim 1, characterized in that: The carbide slag has a CaO content of 65-70wt% and a pH of 12-13.

5. The solid waste-based reinforcing material for cementing according to claim 1, characterized in that: The biomass slag has a SiO2 content of ≥65wt%, an Al2O3 content of ≥15wt%, and a particle size of less than 325 meshes.

6. The solid waste-based reinforcing material for cementing according to claim 1, characterized in that: The aerated concrete waste consists of tobermorite, semi-crystalline CSH (I), CSH gel and silicon dioxide, and is crushed and ground to a powder fineness of less than 600 meshes.

7. The solid waste-based reinforcing material for cementing according to claim 1, characterized in that: The active component B is prepared by mixing modified zirconium silicon slag, silicon manganese slag, phosphorus slag and alkaline slag in a mass ratio of 3:2:1:(1-2); Preferably, the SiO2 content of the modified zirconium-silicon slag is ≥90wt%, the pH is neutral, and the powder particle size is less than 325 mesh; Preferably, the powder particle size of the silicon-manganese slag is less than 325 mesh, the SiO2 content is 35-40wt%, the Al2O3 content is 9-12wt%, the CaO content is 25-28wt%, and the MgO content is 6-11wt%; Preferably, the SiO2 content of the phosphorus slag is 35-40wt%, and the CaO content is 42-48wt%; Preferably, the alkali residue has a CaCO3 content of 40-45wt%, a CaSO4 content of 7-10wt%, and a CaCl2 content of 10-14wt%.

8. The solid waste-based reinforcing material for cementing according to claim 7, characterized in that: The modified zirconium-silicon slag is made into slurry C from zirconium-silicon slag, and the slurry C is subjected to solid-liquid separation after neutralization, water washing and impurity removal, and then high-temperature drying and grinding to obtain a product.

9. The solid waste-based reinforcing material for cementing according to claim 1, characterized in that: The reinforcing components are lithium silicate and aluminum sulfate mixed in a mass ratio of 1:2; Preferably, the purity of the lithium silicate is greater than 98wt%; Preferably, the purity of the aluminum sulfate is greater than 98 wt %.

10. The method for preparing a solid waste-based reinforcing material for cementing cement according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, mixing the active component A and the reinforcing component to obtain powder A; S2, placing active component B in a ball mill to obtain powder B; S3, pneumatically mixing powder A and powder B to obtain a solid waste-based reinforcement material for cementing cement; Preferably, in S2, the ball milling speed is 300-500 rpm, and the ball milling time is 5-8 h. More preferably, the ball milling speed is 500 rpm, and the ball milling time is 6 h.

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