Impact-resistant wear-resistant high-strength protective material for engineering matrix and use method

Abstract

The invention provides an impact-resistant wear-resistant high-strength protective material for an engineering matrix and a use method. The protective material adopts a dry material containing Al2O3, Cr2O3, SiO2, SiC, Fe2O3, aluminate cement and steel fibers, the dry material is combined with water to obtain a thixotropic Bingham body, the thixotropic Bingham body is poured to an engineering matrix part, a solid protective layer is formed after setting and hardening, and the protective material has the advantages of high compactness, high strength, wear resistance, high toughness, high impact resistance, high heat resistance and chemical erosion and destruction resistance, and can be used as a protective material for the engineering matrix part. Impact and abrasion of external materials can be effectively resisted, and the method can be used for protection of engineering matrixes such as a coke screening building in the metallurgical coking field. Moreover, solid wastes such as chrome corundum, iron tailings, waste silicon carbide plates and silicon-containing micro powder can be utilized, so that green development of resource recycling is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering materials and surface protection, and in particular relates to an impact-resistant, wear-resistant, high-strength protective material for an engineering substrate and a use method thereof. Background Art

[0002] The coking process of metallurgical or coking enterprises is generally divided into: coal loading, coking, coking, quenching and screening. After quenching, the coke still has 200℃-300℃ of residual heat, which will enter the coke screening building for screening, storage and transportation. The coke screening building is responsible for the turnover of millions of tons of coke every year, and its lining has been subjected to the impact and wear of coke with a certain temperature for a long time. After a period of use, the concrete protective layer of the reinforced concrete structure of the lining of the coke screening building will be severely worn, exposing the internal steel bars, and even breaking the internal steel bars in severe cases, posing hidden dangers to the entire coke screening building structure. On the other hand, coke contains a small amount of sulfur, which will form sulfuric acid under humid conditions to chemically erode the concrete structure of the coke screening building.

[0003] In addition, solid wastes such as chrome corundum, iron tailings, discarded silicon carbide plates and silicon-containing micropowder contain Al 2 O 3 Cr 2 O 3 、SiO 2 , SiC and other materials. The resource-based utilization of these materials is one of the important measures to implement the green development strategy and promote the dual carbon goals. Summary of the invention

[0004] The present invention provides a protective material for an engineering substrate, which can form a protective layer with high impact resistance, wear resistance and high strength on the surface of the engineering substrate, thereby achieving effective protection of the engineering substrate.

[0005] The technical solution provided by the present invention is: an impact-resistant, wear-resistant and high-strength protective material for an engineering substrate, wherein the weight of the protective material is 100 parts, and the protective material comprises:

[0006] 24-40 parts Al 2 O 3 ;

[0007] 3.5-8 parts Cr 2 O 3 ;

[0008] 5-30 parts SiO 2 ;

[0009] 2-15 parts Fe 2 O 3 ;

[0010] 3.5-7.5 parts SiC;

[0011] 20-40 parts of aluminate cement;

[0012] 2 parts - 8 parts steel fiber.

[0013] The Al 2 O 3 The particle size is preferably less than or equal to 10 mm, more preferably less than or equal to 8 mm.

[0014] The Cr 2 O 3 The particle size is preferably less than or equal to 10 mm, more preferably less than or equal to 8 mm.

[0015] The SiO 2 The particle size is preferably less than or equal to 1 um, more preferably less than or equal to 0.5 um, and further preferably 0.1 μm-0.5 μm.

[0016] The Fe 2 O 3 The particle size is preferably less than or equal to 1 mm, more preferably less than or equal to 0.2 mm.

[0017] The particle size of the SiC is preferably less than or equal to 5 mm, more preferably less than or equal to 2 mm, and further preferably 0.5 mm-2 mm.

[0018] The particle size of the aluminate cement is preferably less than or equal to 0.1 mm.

[0019] The steel fiber is not limited and can be one or two of 304 stainless steel fiber, copper-plated steel fiber, etc.

[0020] The diameter of the steel fiber is preferably less than or equal to 0.5 mm, more preferably less than or equal to 0.3 mm, and the length is preferably less than or equal to 20 mm, more preferably less than or equal to 15 mm, and more preferably 13 mm-15 mm.

[0021] The Al 2 O 3 With at least part of Cr 2 O 3 Can be derived from chrome corundum aggregate, where Cr 2 O 3 The chrome corundum aggregate is a powder obtained by crushing the chrome corundum block material, with a particle size of less than 10 mm, preferably less than 8 mm, and has good wear resistance, impact resistance and high temperature resistance, and its volume density is preferably greater than or equal to 3.7 g / cm 3The porosity is preferably less than or equal to 5%. The chromium corundum may be derived from solid waste generated during the production of metallic chromium by aluminothermic method.

[0022] At least part of the Fe 2 O 3 It can be derived from iron tailings, i.e., solid waste generated during the iron ore dressing process, whose main mineral composition is quartz and hematite, and can also include one or more of kaolin, mica, chlorite, and calcite. The iron tailings have a high refractoriness, preferably above 1550° C. The median particle size D50 of the iron tailings is preferably 0.08 mm-0.1 mm.

[0023] At least part of the SiO 2 The at least part of SiO 2 It can also be derived from other silicon-containing micropowders, which contain more than 80% SiO by weight. 2 For example, the silicon-containing fine powder can be micron-sized solid waste obtained by cooling and settling the high-temperature smoke generated by smelting metallic silicon or desiliconized zirconium oxide. When the micron-sized solid waste obtained by cooling and settling the high-temperature smoke generated by smelting metallic silicon or desiliconized zirconium oxide is selected, it also contains less than 10% by weight of ZrO 2 , called zirconium-containing silicon powder.

[0024] SiC has stable chemical properties, high thermal conductivity, low thermal expansion coefficient and good wear resistance. The SiC can be derived from waste aggregates, which are powders obtained by recycling, sorting, crushing and screening waste, wherein the weight percentage of SiC is preferably above 75%. The waste can be waste silicon carbide plates, which are a type of waste in the ceramic industry and are not easily corroded or adhered by hot coke.

[0025] In order to implement the green development strategy, save energy and protect the environment, it is preferred to use solid waste chrome corundum aggregate, iron tailings and zirconium-containing silicon powder as raw materials to prepare the anti-protective material. As an implementation method, the weight of the protective material is 100 parts, which includes:

[0026] 30-45 parts of chrome corundum aggregate;

[0027] 5-15 parts of iron tailings;

[0028] 3.5-7.5 parts of silicon carbide;

[0029] 2-15 parts of zirconium-containing silicon powder;

[0030] 20-40 parts of aluminate cement;

[0031] 2 parts - 8 parts steel fiber.

[0032] According to the weight percentage, the chrome corundum aggregate contains 80%-90% Al 2 O 3 With 5%-20% Cr 2 O 3 , the iron tailings contain 70%-85% SiO 2 With 8%-15% Fe 2 O 3 The zirconium-containing silicon powder contains more than 80% SiO 2 With less than 10% ZrO 2 .

[0033] The chrome corundum aggregate may also contain MgO, SiO 2 , Fe 2 O 3 、TiO 2 , CaO, Na 2 O.K 2 As an implementation method, the chrome corundum aggregate contains 0%-1% MgO, 0%-2% SiO 2 , 0%-2% Fe 2 O 3 , 0%-2% CaO, 0%-1% TiO 2 ,0%-1% Na 2 O and 0%-1% K 2 O.

[0034] The aluminate cement has excellent properties such as rapid hardening and early strength, acid salt medium corrosion resistance, ability to harden at low temperatures and high temperature resistance. 2 O 3 Cr 2 O 3 、SiO 2 、SiC、Fe 2 O 3 The protective body formed by the dry material obtained by mixing powder materials such as steel fiber and steel fiber with water and solidifying after solidification has the characteristics of early strength and fast hardening. In order to further accelerate the final setting time and further improve the early strength, it is preferred to mix sulphoaluminate cement into aluminate cement to form composite cement. Compared with aluminate cement, sulphoaluminate cement has a shorter final setting time and higher early strength. Preferably, the protective material contains 20-33 parts of aluminate cement and 3-7 parts of sulphoaluminate cement. Preferably, the particle size of the sulphoaluminate cement is preferably less than or equal to 0.1 mm.

[0035] The method for using the impact-resistant, wear-resistant and high-strength protective material of the present invention is as follows:

[0036] According to the weight percentage, 100 parts of the protective material are mixed with 3-10 parts of water, stirred into a thixotropic Bingham body, poured onto the engineering substrate, and formed into a protective layer after solidification and hardening. The protective layer has high density, high strength, wear resistance, high toughness, high impact resistance, high heat resistance and resistance to chemical erosion and damage, and can effectively protect the engineering substrate.

[0037] The protective material may also include one or more of a dispersant, a thickener, a defoaming agent, and the like.

[0038] The dispersant is not limited and can be one or both of phosphate and polycarboxylate.

[0039] The thickener is used to increase the suspension of the material to prevent the components with large specific gravity from settling during the construction process. The thickener is not limited and can be one or both of hydroxypropyl methylcellulose and starch ether.

[0040] Considering that if a large amount of water is added to the protective material during actual construction, sedimentation, segregation, water seepage, etc. are likely to occur, it is preferred to add a stabilizer to maintain the fluidity and workability.

[0041] Preferably, the protective material contains 0.1 to 0.5 parts of a dispersant.

[0042] Preferably, the protective material contains 0.01 to 0.1 parts of a thickener.

[0043] Preferably, the protective material contains 0.01 to 0.1 parts of a defoaming agent.

[0044] Preferably, the protective material contains 0.01 to 0.1 parts of a stabilizer.

[0045] The engineering matrix is ​​not limited and can be an engineering matrix in the coking field, such as a coke screening building. That is, the impact-resistant and wear-resistant high-strength protective material of the present invention can be used for the inner wall protection of the coke screening building to ensure the safe operation of the coke screening building. When the coke screening building is a concrete structure, preferably, the protective layer and the concrete structure are combined by anchors and / or anchoring nets to form a solid whole, which further ensures the safe operation of the coke screening building.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] (1) The present invention adopts 2 O 3 Cr 2 O 3 、SiO 2 、SiC、Fe 2 O 3The dry materials of aluminate cement and steel fiber are combined with water to obtain a thixotropic Bingham body, which is poured into the engineering base and forms a solid protective layer after solidification and hardening. It has high density, high strength, wear resistance, high toughness, high impact resistance, high heat resistance and resistance to chemical erosion and damage. It can effectively resist the impact and wear of foreign materials. It has high strength at working temperatures from room temperature to 600℃, and the strength can be further increased with the increase of the use temperature.

[0048] (2) The protective material of the present invention is simple to use, has no pollution to the environment, can be constructed at room temperature, and is easy to construct;

[0049] (3) The present invention can make resourceful use of solid wastes such as chrome corundum, iron tailings, discarded silicon carbide plates, silicon-containing micropowder, etc., implement the green development strategy, and achieve energy conservation and environmental protection;

[0050] (4) The protective material of the present invention can be used for engineering substrates in the field of metallurgical coking, for example, it can be used for the protection of coke screening towers. It is an effective impact-resistant, wear-resistant and high-strength protective material for coke screening towers. It has higher integrity and impact resistance than the original design of cast stone slabs and other structures, and can play a good protective role for the concrete structure of the coke screening tower. It can also play a structural reinforcement role for the concrete structure of the coke screening tower that has been partially damaged. It is well suited to practical engineering applications and can increase the service life of the coke screening tower. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with embodiments. It should be pointed out that the embodiments described below are intended to facilitate the understanding of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the contents of the present invention above still fall within the scope of protection of the present invention.

[0052] The words “include”, “including” and the like used in the present invention should be interpreted as including rather than being exclusive or exhaustive; that is, the meaning is “including but not limited to”.

[0053] Embodiment 1:

[0054] The weight of the protective material is calculated based on 100 parts, and the weight of each component and its parts are as follows:

[0055]

[0056] The chrome corundum aggregate is a powder with a particle size of less than 8 mm obtained by crushing solid waste generated in the process of producing metallic chromium by aluminothermic method. Its chemical composition and weight percentage are as follows:

[0057]

[0058] The balance is other impurities.

[0059] The volume density of the chrome corundum aggregate is 3.7 g / cm 3 , apparent porosity ≤5%, with high strength, good wear resistance, impact resistance and high temperature resistance.

[0060] The iron tailings are solid wastes produced by iron ore dressing, and contain 83% quartz and 10% hematite (Fe 2 O 3 ), also includes kaolin, mica, chlorite, calcite, its refractoriness is 1590℃, and the median particle size is 0.085mm.

[0061] The waste silicon carbide plates are waste products of kiln tools used in the firing process of the ceramic industry that have been damaged after long-term use. The waste is not easily corroded or adhered by hot coke. The waste is recycled, sorted, crushed and screened to obtain a waste powder, in which the weight percentage of SiC is 85% and the particle size is less than or equal to 1 mm.

[0062] The zirconium-containing silicon powder is a micron-sized solid waste obtained by cooling and settling the high-temperature smoke generated when smelting zircon sand to produce desiliconized zirconium dioxide. It contains 94% by weight of SiO 2 and 5% ZrO 2 The performance indicators of the zirconium-containing silicon micropowder are as follows:

[0063] Loss on ignition: less than 0.3%;

[0064] Whiteness: 85;

[0065] Specific surface area: 20m 2 / g-28m 2 / g;

[0066] Particle size D 50 :0.1μm-0.3μm;

[0067] PH value: 2-4;

[0068] Mobility:180mm.

[0069] The composite cement is a composite of aluminate cement and sulphoaluminate cement, with a particle size of less than 0.088 mm, wherein aluminate cement accounts for 32 parts and sulphoaluminate cement accounts for 4 parts.

[0070] The 304 stainless steel fiber has a diameter of 0.5 mm to 1.5 mm, a length of 15 mm to 25 mm, and a tensile strength of 520 MPa.

[0071] The copper-plated steel fiber has a diameter of 0.2 mm to 0.3 mm, a length of 13 mm to 15 mm, and a tensile strength of 2800 MPa.

[0072] The dispersant is one or a combination of phosphate and polycarboxylate.

[0073] The thickener is hydroxypropyl methylcellulose or starch ether, which is used to increase the suspension of the material and prevent the solid waste chrome corundum aggregate with a large specific gravity from settling during the construction process.

[0074] When the stabilizer is used in construction, the protective material maintains a fluid state and a workability state after adding water.

[0075] When the protective material is used for the protection of an engineering substrate, the specific method of use is as follows:

[0076] According to the weight proportions, chrome corundum aggregate, iron tailings powder, waste silicon carbide plate powder, zirconium-containing silicon powder, composite cement, 304 stainless steel fiber, copper-plated steel fiber, dispersant, thickener and defoamer are mixed and prepared to obtain a dry powder with a total weight proportion of 100 parts by weight; during construction, 5 parts by weight of clean water are added to the 100 parts by weight of dry powder, and stirred evenly to form a thixotropic Bingham fluid; the Bingham fluid is poured into the template of the engineering matrix, and vibrated and molded using a vibrating rod to make it dense, condensed and hardened, to form a solid protective layer and perform performance tests, as follows:

[0077] (1) After one day of solidification, the protective layer is completely hardened and demolded at room temperature. The volume density of the protective layer formed by solidification and hardening is 3.0g / cm 3 The flexural strength is 13.7MPa and the compressive strength is 86.4MPa.

[0078] (2) Under standard curing conditions of 20°C ± 2°C and relative humidity greater than 95%, the specimens were cured for 14 days. After the curing, the specimens were taken out and placed in an oven at 110°C for 24 hours (recorded as 110°C × 24h). The volume density of the protective layer was 2.9 g / cm 3 , flexural strength is greater than 14MPa, compressive strength is 153.0MPa, linear change rate ΔL 110 It is -0.12%.

[0079] Linear change rate ΔL 110 The test method is as follows:

[0080] After 14 days of standard curing, the protective layer test block was accurately measured with a vernier caliper for the length of the middle part of the test block. Four length dimensions were tested in the length direction of each test block, and the average value was taken as the original length of the test block, which was expressed as L. 0After the test block is baked at 110℃ for 24 hours, each test block is tested for 4 length dimensions in the length direction, and the average value is taken as the 110℃ length of the test block, which is expressed as L 110 110℃×24h Linear change rate (ΔL 110 ) According to the formula: ΔL 110 =(L 110 -L 0 ) / L 0 ×100% calculation.

[0081] (3) The test piece baked in step (2) was heated to 400°C in an electric furnace with a temperature control device for 3 hours (recorded as 400°C × 3h). The volume density of the protective layer was 2.9 g / cm 3 , flexural strength is greater than 14MPa, compressive strength is 196MPa, linear change rate ΔL 400 It is -0.14%.

[0082] Linear change rate ΔL 400 The test method is as follows:

[0083] Each test block is tested for four length dimensions in the length direction, and the average value is taken as the 400℃ length of the test block, which is expressed as L 400 400℃×24h Linear change rate (ΔL 400 ) According to the formula: ΔL 400 =(L 400 -L 0 ) / L 0

[0084] ×100% calculation.

[0085] The above performance test results are shown in Table 1 below.

[0086] Table 1: Performance test results of the protective layer in Example 1

[0087]

[0088] The impact resistance test was performed on the protective layer test block after the treatment in step (2) and the protective layer test block after the treatment in step (3), as follows:

[0089] A 4 kg steel ball was used to hit the surface of the test block from a distance of 4 meters. The protective layer test block treated in step (2) and the protective layer test block treated in step (3) remained intact after 10 impacts. In contrast, the cast stone plate was completely broken after one impact.

[0090] In this embodiment, the engineering matrix can be a coke screening building, which is a concrete structure. The inner wall of the coke screening building is safely protected, that is, Bingham fluid is poured onto the inner wall of the coke screening building, and a vibrating rod is used to vibrate and shape it to make it dense. After solidification and hardening, it forms a solid whole, which effectively ensures the safe operation of the coke screening building.

[0091] Embodiment 2:

[0092] The weight of the protective material is calculated based on 100 parts, and the weight of each component and its parts are as follows:

[0093]

[0094] The chromium corundum aggregate is a powder with a particle size of less than 8 mm obtained by crushing solid waste generated in the process of producing metal chromium by aluminothermic method. Its chemical composition and weight percentage are as follows:

[0095]

[0096] The balance is other impurities.

[0097] The volume density of the chrome corundum aggregate is 3.75 g / cm 3 , apparent porosity ≤5%, with high strength, good wear resistance, impact resistance and high temperature resistance.

[0098] The iron tailings are solid wastes produced by iron ore dressing, and contain 45% quartz and 50% hematite (Fe 2 O 3 ), also includes kaolin, mica, chlorite, calcite, with a median particle size of 0.088mm.

[0099] The waste silicon carbide shelf is a waste product of kiln tools used in the firing process of the ceramic industry after being damaged after long-term use. It is not easily corroded or adhered by hot coke. It is recycled, sorted, crushed and screened to obtain a waste aggregate, in which the weight percentage of SiC is 80% and the particle size is less than or equal to 1 mm.

[0100] The zirconium-containing silicon powder is a solid waste powder produced by smelting zirconium-containing raw materials to produce desiliconized zirconium dioxide, which contains 94% by weight of SiO 2 and 4% ZrO 2 The performance indicators of the zirconium-containing silicon micropowder are as follows:

[0101] Loss on ignition: less than 0.3%;

[0102] Whiteness: 85;

[0103] Specific surface area: 20m 2 / g-28m2 / g;

[0104] Particle size D 50 :0.1μm-0.3μm;

[0105] PH value: 2-4;

[0106] Mobility:180mm.

[0107] The composite cement is a composite of aluminate cement and sulphoaluminate cement, with a particle size of less than 0.088 mm, wherein the aluminate cement accounts for 30 parts and the sulphoaluminate cement accounts for 5 parts.

[0108] The 304 stainless steel fiber has a diameter of 0.5 mm to 1.5 mm, a length of 15 mm to 25 mm, and a tensile strength of 520 MPa.

[0109] The copper-plated steel fiber has a diameter of 0.2 mm to 0.3 mm, a length of 13 mm to 15 mm, and a tensile strength of 2800 MPa.

[0110] The dispersant is one or a combination of phosphate and polycarboxylate.

[0111] The thickener is hydroxypropyl methylcellulose or starch ether, which is used to increase the suspension of the material and prevent the solid waste chrome corundum aggregate with a large specific gravity from settling during the construction process.

[0112] When the stabilizer is used in construction, the protective material maintains a fluid state and a workability state after adding water.

[0113] When the protective material is used for the protection of engineering substrates, the details are as follows:

[0114] According to the weight proportions, chrome corundum aggregate, iron tailings, waste silicon carbide slabs, zirconium-containing silicon powder, composite cement, 304 stainless steel fiber, copper-plated steel fiber, dispersant, thickener and defoamer are mixed and prepared to obtain a dry powder with a total weight proportion of 100 parts by weight; during construction, 5.2 parts by weight of clean water are added to the 100 parts by weight of dry powder, and stirred evenly to form a thixotropic Bingham fluid; the Bingham fluid is poured into the template of the engineering matrix, and vibrated and molded using a vibrating rod to make it dense, condensed and hardened, to form a solid protective layer, and the performance test is performed, as follows:

[0115] (1) After one day of solidification, the protective layer was completely hardened and demolded at room temperature. The volume density of the protective layer formed by solidification and hardening was 2.95 g / cm 3 The flexural strength is 12.5MPa and the compressive strength is 81.2MPa.

[0116] (2) Under standard curing conditions of 20°C ± 2°C and relative humidity greater than 95%, the specimens were cured for 14 days. After the curing, the specimens were taken out and placed in an oven at 110°C for 24 hours (recorded as 110°C × 24h). The volume density of the protective layer was 2.92 g / cm 3 , flexural strength is greater than 14MPa, compressive strength is 133.2MPa, linear change rate ΔL 110 The linear change rate ΔL is -0.10%. 110 The testing method is the same as that in Example 1.

[0117] (3) The test piece baked in step (2) was heated to 400°C in an electric furnace with a temperature control device and kept warm for 3 hours (recorded as 400°C × 3h). The volume density of the protective layer was 2.87 g / cm 3 , flexural strength is greater than 14MPa, compressive strength is 156.2MPa, linear change rate ΔL 400 The linear change rate ΔL is -0.12%. 400 The testing method is the same as that in Example 1.

[0118] The above performance test results are shown in Table 2 below.

[0119] Table 2: Performance test results of the protective layer in Example 2

[0120]

[0121] The impact resistance test was performed on the protective layer test block after the treatment in step (2) and the protective layer test block after the treatment in step (3), as follows:

[0122] A 4 kg steel ball was used to hit the surface of the test block from a distance of 4 meters. The protective layer test block treated in step (2) and the protective layer test block treated in step (3) remained intact after 10 impacts. In contrast, the cast stone plate was completely broken after one impact.

[0123] In this embodiment, the engineering matrix can be a coke screening building, which is a concrete structure. The inner wall of the coke screening building is safely protected, that is, the Bingham fluid is poured onto the inner wall of the coke screening building, and a vibrating rod is used to vibrate and shape it to make it dense. For further protection, the Bingham fluid and the concrete structure are combined by anchors and anchor nets, and a solid whole is formed after solidification and hardening, which effectively ensures the safe operation of the coke screening building.

[0124] Finally, it should be noted that the specific embodiments described herein are merely examples of the spirit of the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described, or replace them in similar ways. It is not necessary and impossible to provide all examples of all implementation methods here, and these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional limitations.

Claims

1. High-strength impact-resistant and wear-resistant protective material for engineering substrates, characterized by: The weight of the protective material is 100 parts, which includes: 24-40 parts Al2O3; 3.5-8 parts Cr2O3; 5-30 parts SiO2; 2-15 parts Fe2O3; 3.5-7.5 parts SiC; 20-40 parts of aluminate cement; 2 parts - 8 parts steel fiber.

2. The impact-resistant, wear-resistant, high-strength protective material for engineering substrates according to claim 1, characterized in that: The particle size of Al2O3 is less than or equal to 10 mm, preferably less than or equal to 8 mm; The particle size of the Cr2O3 is less than or equal to 10 mm, preferably less than or equal to 8 mm; The particle size of SiO2 is less than or equal to 1um, preferably less than or equal to 0.5um, and more preferably 0.1μm-0.5μm; The particle size of the Fe2O3 is less than or equal to 1 mm, preferably less than or equal to 0.2 mm; The particle size of the SiC is less than or equal to 5 mm, preferably less than or equal to 2 mm, and more preferably 0.5 mm to 2 mm; The particle size of the aluminate cement is less than or equal to 0.1 mm; The diameter of the steel fiber is less than or equal to 0.5 mm, preferably less than or equal to 0.3 mm, and the length is preferably less than or equal to 20 mm, further preferably less than or equal to 15 mm, and more preferably 13 mm-15 mm.

3. The impact-resistant, wear-resistant, high-strength protective material for engineering substrates according to claim 1, characterized in that: The Al2O3 and at least part of the Cr2O3 are derived from chrome corundum aggregate; Preferably, the chrome corundum is derived from solid waste generated during the production of metallic chromium by the aluminothermic process.

4. The impact-resistant, wear-resistant, high-strength protective material for engineering substrates according to claim 1, characterized in that: At least part of the Fe2O3 is derived from iron tailings, i.e., solid waste generated during the iron ore dressing process, and its main mineral components are quartz and hematite.

5. The impact-resistant, wear-resistant, high-strength protective material for engineering substrates according to claim 1, characterized in that: At least part of the SiO2 is derived from micron-sized solid waste obtained by cooling and settling high-temperature smoke generated by smelting metallic silicon or desiliconized zirconium oxide, and contains more than 80% SiO2 by weight; Preferably, the micron-sized solid waste obtained by cooling and settling the high-temperature smoke generated by smelting desiliconized zirconium oxide also contains ZrO2 with a weight percentage of less than 10%; Preferably, at least part of the SiO2 is derived from quartz in the iron ore tailings.

6. The impact-resistant, wear-resistant, high-strength protective material for engineering substrates according to claim 1, characterized in that: The SiC is derived from waste aggregate, wherein the weight percentage of SiC is more than 75%; Preferably, the waste is waste silicon carbide plates.

7. The impact-resistant, wear-resistant, high-strength protective material for engineering substrates according to claim 1, characterized in that: The protective material also includes one or more of a dispersant, a thickener, a defoamer, and a stabilizer; Preferably, the dispersant is one or both of phosphate and polycarboxylate; Preferably, the thickener is one or more of hydroxypropyl methylcellulose and starch ether; Preferably, the protective material contains 0.1 to 0.5 parts of a dispersant; Preferably, the protective material contains 0.01 to 0.1 parts of a thickener; Preferably, the protective material contains 0.01 to 0.1 parts of a defoaming agent; Preferably, the protective material contains 0.01 to 0.1 parts of a stabilizer.

8. The impact-resistant, wear-resistant, high-strength protective material for engineering substrates according to claim 1, characterized in that: The weight of the protective material is 100 parts, which includes: 30-45 parts of chrome corundum aggregate; 5-15 parts of iron tailings; 3.5-7.5 parts of silicon carbide; 2-15 parts of zirconium-containing silicon powder; 20-40 parts of aluminate cement; 2-8 parts of steel fiber; In terms of weight percentage, the chrome corundum aggregate contains 80%-90% Al2O3 and 2%-20% Cr2O3, the iron tailings contain 70%-85% SiO2 and 8%-15% Fe2O3, and the zirconium-containing silicon powder contains more than 80% SiO2 and less than 10% ZrO2.

9. The impact-resistant, wear-resistant, high-strength protective material for engineering substrates according to claim 1 or 8, characterized in that: The protective material contains 20 to 33 parts of aluminate cement and 3 to 7 parts of sulphoaluminate cement.

10. The method for using the impact-resistant, wear-resistant and high-strength protective material for engineering substrates according to any one of claims 1 to 9, characterized in that: According to the weight percentage, 100 parts of the protective material are mixed with 3 parts to 10 parts of water, stirred into a thixotropic Bingham body, poured onto the engineering substrate, and formed into a protective layer after solidification and hardening.

11. The method of use according to claim 10, characterized in that: The engineering matrix is ​​an engineering matrix in the field of coking; Preferably, the engineering matrix is ​​a coke screening building; Preferably, a thixotropic Bingham body is poured onto the inner wall of the coke screening building; Preferably, when the coke screening building is a concrete structure, the protective layer and the concrete structure are combined by anchoring pieces and / or anchoring nets.

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