A formula and preparation method for a waste concrete mass block for gravity energy storage.

Abstract

This invention discloses a formula and preparation method for a waste-filled concrete mass block for gravity energy storage. The formula comprises the following components by weight: 102-617 parts of pretreated high-density solid waste, 11-14 parts of ordinary Portland cement, 1-2 parts of fly ash, 1-3 parts of mineral powder, 1-2 parts of silica fume, 17-22 parts of sand, 28.5-31.5 parts of gravel, 1-3 parts of steel fiber, 0.14-0.21 parts of water-reducing agent, 0.14-0.21 parts of early-strength agent, and 3.4-4.3 parts of water. This invention utilizes a method of filling solid waste within a high-performance concrete frame, which can absorb a large amount of solid waste, has low requirements for solid waste utilization, and achieves a maximum concrete solidity ratio of only 25%, thereby significantly reducing the cost of the mass block.

Description

Technical Field

[0001] This invention relates to the field of large counterweight preparation technology, specifically to a formula and preparation method of a waste concrete mass block for gravity energy storage. Background Technology

[0002] With the advancement of the national "dual-carbon" policy and the rapid development of new energy sources, energy storage has gradually received increasing attention. Gravity energy storage refers to a new type of energy storage that converts excess electrical energy generated by clean energy sources such as wind and solar power into the gravitational potential energy of a mass block, which is then converted back into electrical energy when needed. The mass block, also known as a counterweight, is the medium for energy conversion in a gravity energy storage system and is a crucial component, meaning that a large number of mass blocks are required in the process. Common mass blocks are typically composed of materials such as concrete and metal blocks. The production of such mass blocks is not only costly but also wastes significant amounts of natural resources. Therefore, how to mass-produce large, inexpensive, and environmentally friendly mass blocks is one of the key factors restricting the development of gravity energy storage technology.

[0003] Solid waste refers to solid and semi-solid waste generated by humans in the process of daily life and industrial production. my country generates nearly 1 billion tons of solid waste every year. Among them, humic and cellulose solid waste can be effectively treated by composting and incineration power generation. However, for some solid wastes with higher density, relatively stable chemical properties, and high temperature resistance, such as tailings, construction waste, smelting slag, and coal gangue, there are currently no good treatment methods. The most common treatment method is to pile up or landfill these solid wastes. However, this treatment method not only wastes a lot of land resources, but also causes serious harm to the natural environment.

[0004] However, as we all know, garbage actually refers to resources that have not been put in the right place. If this kind of solid waste can be used in mass blocks, it can not only significantly reduce the production cost of mass blocks, but also solve the problem of how to deal with this kind of solid waste, thereby improving resource utilization.

[0005] Chinese patent CN110255986B discloses "A steel slag core concrete counterweight block, its preparation method, and its application," specifically disclosing that "the steel slag core concrete consists of a concrete shell, a steel slag core, and metal positioning connectors; a steel mesh as concrete reinforcement is provided in the shell, the steel slag core is placed in the concrete shell, and connected by the bonding between the steel slag and the concrete, and by six metal positioning connectors extending into the steel slag core; the solid phase material of the steel slag core of the counterweight block consists of cement, fly ash, coarse steel slag, fine steel slag, and rubber particles." It is evident that this counterweight block uses ordinary concrete as the outer layer and steel slag core concrete prepared with steel slag as aggregate as the inner layer, effectively utilizing waste steel slag resources and increasing the density of the counterweight block. However, this invention has the following drawback: it can only utilize waste steel slag resources that meet the requirements for concrete mixing, and cannot utilize other types of solid waste or solid waste that does not meet the requirements for concrete mixing.

[0006] Chinese patent CN116041015A discloses a "high-performance self-compacting cement counterweight block." This counterweight block uses porous ceramsite as the aggregate and incorporates modified dimethicone and sodium alginate composite gel fiber as a strength enhancer, significantly improving the counterweight block's strength and reducing demolding time by nearly half. However, this invention has the following drawbacks: the counterweight block is cast in one piece, with mortar filling the spaces between the porous aggregates. The amount of cementitious material and quartz sand used is comparable to that of ordinary counterweight block production schemes, resulting in relatively high production costs.

[0007] Chinese patent CN115073092B discloses "A large counterweight block made from pyrite tailings and its preparation method." This counterweight block effectively utilizes pyrite tailings and slag solid waste resources. Steel slag and recycled aggregate are bonded together using cement and a concentrated curing agent. Before hardening, the counterweight block is pressed using a gantry press, significantly increasing its density. However, this invention has the following drawback: because the counterweight block contains a certain amount of slag, its surface corrosion resistance is poor. Therefore, after hardening, it needs to be coated with an anti-corrosion material, making the process relatively complex.

[0008] Therefore, how to ensure the durability of mass blocks while disposing of large quantities of fixed waste has become an urgent problem to be solved. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a formula and preparation method for a waste-absorbing concrete mass block for gravity energy storage. By filling solid waste into a high-performance concrete frame, a large amount of solid waste can be disposed of, the requirements for solid waste utilization are low, and the concrete solidity ratio is only 25% at most, thereby significantly reducing the cost of the mass block.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The innovation of the present invention is that the mass block for gravity energy storage comprises the following components by weight:

[0011] Pre-treatment of 102-617 portions of high-density solid waste

[0012] 11-14 parts of ordinary Portland cement

[0013] 1-2 parts fly ash

[0014] 1-3 parts mineral powder

[0015] 1-2 parts silica fume

[0016] 17-22 parts sand

[0017] 28.5-31.5 parts of pebbles

[0018] 1-3 parts steel fiber

[0019] Water-reducing agent 0.14~0.21 parts

[0020] Early strength agent 0.14-0.21 parts

[0021] Water 3.4~4.3 parts;

[0022] The method for preparing the mass block includes the following steps:

[0023] (1) Weighing and mixing: According to the set ratio, weigh ordinary Portland cement, fly ash, mineral powder, silica fume, sand, gravel, steel fiber, water, water-reducing agent and early strength agent in sequence, and mix them in the mixer for 5 minutes to obtain concrete;

[0024] (2) Component casting: The concrete is poured into the pre-prepared lattice frame components and cover plate components molds and compacted by vibration;

[0025] (3) Component curing: Place the cast concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days;

[0026] (4) Solid waste filling: The high-density solid waste is pretreated, and then the weighed pretreated high-density solid waste is filled into the concrete grid frame members to 98% of the design weight;

[0027] (5) Counterweight adjustment: Continue to fill the concrete lattice frame members with high-density solid waste with a particle size of less than 4.75 mm to adjust the weight until it reaches 100% of the design weight;

[0028] (6) Cover plate encapsulation: The concrete cover plate component is combined and installed with the concrete lattice frame component to form a closed rectangular mass block.

[0029] Preferably, in the above formulation, the pretreated high-density solid waste is one or two of ore tailings, construction waste, smelting slag, or other solid waste, and the apparent density of the pretreated high-density solid waste is 1500 kg / m³. 3 ~3000kg / m 3 .

[0030] Preferably, in the above formula, the fly ash is Grade I fly ash and the mineral powder is S95 grade mineral powder.

[0031] Preferably, in the above formula, the sand is natural sand with a fineness modulus of 2.5 in a two-zone gradation, and the gravel is small gravel with a particle size of 5~15mm.

[0032] Preferably, in the above formulation, the steel fiber is a steel fiber with a diameter of 0.75 mm, and the water-reducing agent is a polycarboxylate water-reducing agent.

[0033] Preferably, in step (2) above, the hollowness of the lattice frame member is not less than 75%.

[0034] Preferably, in step (3) above, the concrete lattice frame members and the concrete cover plate members are assembled to form a mass block frame.

[0035] Preferably, in step (4) above, the solid waste filling rate in the concrete lattice frame member shall not exceed 98%.

[0036] Preferably, in step (4) above, the specific pretreatment process for high-density solid waste before loading is as follows:

[0037] (4.1) Solid waste classification: The collected high-density solid waste is classified into two types according to two treatment methods: crushable and compactable;

[0038] (4.2) Solid waste crushing: Crushing crushable high-density solid waste to reduce the particle size to less than 25 mm;

[0039] (4.3) Particle screening: High-density solid waste particles are screened and sorted according to two particle size ranges: 5mm~15mm and less than 4.75mm.

[0040] (4.4) Mixed particle size: Mix two particle size ranges of high-density solid waste particles in proportion for later use;

[0041] (4.5) Solid waste compaction: Compactable high-density solid waste is compacted using a 6000T gantry press for 60 seconds;

[0042] (4.6) Stacking for later use: Stack the compacted high-density solid waste blocks neatly for later use.

[0043] The beneficial effects of this invention are:

[0044] (1) The present invention adopts the method of filling solid waste in a high-performance concrete frame, which can dispose of a large amount of solid waste, has low requirements for the utilization of solid waste, and the concrete solid ratio is only 25% at most, thereby greatly reducing the cost of the mass block.

[0045] (2) The present invention uses high-performance concrete of grade C80 and above as the frame of the mass block, thereby effectively improving the durability of the mass block and increasing its service life.

[0046] (3) The present invention can design high-performance concrete frames with different structures according to different lifting methods of gravity energy storage, thereby maximizing the use of high-performance concrete strength;

[0047] (4) The present invention can flexibly adjust the weight of a single mass block, thereby controlling the uniformity of the weight of mass blocks produced in the same batch. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a flowchart illustrating the preparation process of a waste concrete mass block for gravity energy storage according to the present invention. Detailed Implementation

[0049] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0050] The present invention provides a formula for a waste-concrete mass block for gravity energy storage, such as... Figure 1 As shown, it includes the following components in parts by weight:

[0051] Pre-treatment of 102-617 portions of high-density solid waste

[0052] 11-14 parts of ordinary Portland cement

[0053] 1-2 parts fly ash

[0054] 1-3 parts mineral powder

[0055] 1-2 parts silica fume

[0056] 17-22 parts sand

[0057] 28.5-31.5 parts of pebbles

[0058] 1-3 parts steel fiber

[0059] Water-reducing agent 0.14~0.21 parts

[0060] Early strength agent 0.14-0.21 parts

[0061] Water 3.4 to 4.3 parts.

[0062] In the above formulation, the pretreated high-density solid waste is one or two of ore tailings, construction waste, smelting slag, or other solid waste, and the apparent density of the pretreated high-density solid waste is 1500 kg / m³. 3 ~3000kg / m 3 This provides weight to the mass block, ensuring to some extent that the mass block does not lose its application value due to excessively low density.

[0063] In the above formula, the fly ash used is Grade I fly ash, and the mineral powder used is Grade S95 mineral powder.

[0064] In the above formula, the sand used is natural sand with a fineness modulus of 2.5 in the second zone gradation, and the gravel used is small gravel with a particle size of 5~15mm.

[0065] In the above formula, steel fibers with a diameter of 0.75 mm are used, and polycarboxylate superplasticizer is used as the water-reducing agent.

[0066] The present invention provides a method for preparing a waste concrete mass block for gravity energy storage, such as... Figure 1 As shown, it includes the following steps:

[0067] (1) Weighing and mixing: According to the set ratio, weigh ordinary silicate cement, fly ash, mineral powder, silica fume, sand, gravel, steel fiber, water, water-reducing agent and early strength agent in sequence, and mix them in the mixer for 5 minutes to obtain concrete.

[0068] (2) Component casting: The concrete is poured into the pre-prepared lattice frame components and cover plate components molds and compacted by vibration;

[0069] In the above steps, the void ratio of the lattice frame components shall not be less than 75%.

[0070] (3) Component curing: Place the cast concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days;

[0071] In the above steps, the concrete lattice frame components and concrete cover plate components are assembled to form a mass block frame.

[0072] (4) Solid waste filling: High-density solid waste is pre-treated, and then the weighed pre-treated high-density solid waste is filled into the concrete grid frame components and filled to 98% of the design weight. This provides room for adjustment to make the same batch of mass blocks uniformly designed.

[0073] In the above steps, the solid waste filling rate in the concrete lattice frame components shall not exceed 98%, thereby facilitating weight adjustment by filling with high-density solid waste with a particle size of less than 4.75 mm.

[0074] The specific pretreatment process for high-density solid waste before loading according to this invention is as follows:

[0075] (4.1) Solid waste classification: The collected high-density solid waste is classified into two types of treatment: crushable and compactable.

[0076] (4.2) Solid waste crushing: Crushing crushable high-density solid waste to make its particle size less than 25mm.

[0077] (4.3) Particle screening: High-density solid waste particles are screened and sorted according to two particle size ranges: 5mm~15mm and less than 4.75mm.

[0078] (4.4) Mixed particle size: Mix two particle size ranges of high-density solid waste particles in proportion for later use.

[0079] (4.5) Solid waste compaction: Compact the compactable high-density solid waste using a 6000T gantry press for 60 seconds.

[0080] (4.6) Stacking for later use: Stack the compacted high-density solid waste blocks neatly for later use.

[0081] (5) Counterweight adjustment: Continue to fill the concrete grid frame components with high-density solid waste with a particle size of less than 4.75mm to adjust the weight until it is filled to 100% of the design weight; the counterweight adjustment of this invention uses high-density solid waste with a particle size of less than 4.75mm, so as to make full use of the gaps between high-density solid waste with a particle size of 5mm~15mm, increase the degree of controllability, and provide the density of solid waste filling material.

[0082] (6) Cover plate encapsulation: The concrete cover plate component is combined and installed with the concrete lattice frame component to form a closed rectangular mass block.

[0083] Example 1

[0084] Step 1: Weigh out the following materials in order: 13 parts of ordinary silicate PO52.5 cement, 1.23 parts of grade I fly ash, 2.23 parts of S95 grade mineral powder, 1.05 parts of silica fume, 23.7 parts of natural sand with a fineness modulus of 2.5 in zone II gradation, 30.6 parts of small stones with a particle size of 5-15mm, 1.05 parts of steel fiber with a diameter of 0.75mm, 4.18 parts of water, 0.21 parts of polycarboxylate superplasticizer, and 0.21 parts of early strength agent. Mix the above materials in a mixer for 5 minutes to obtain concrete.

[0085] Step 2: Pour concrete into the molds of the cubic mass block lattice frame components and cover plate components with a porosity of 75%, a side length of 1.1m, and a wall thickness of 0.1m, and then vibrate to compact it.

[0086] Step 3: Place the poured concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days.

[0087] Step 4: Weigh out 213.8 portions of pretreated material with a bulk density of 2400 kg / m³. 3 Iron tailings are filled into concrete lattice frame components and filled to 98% of the design weight.

[0088] Step 5: Continue filling the concrete lattice frame members with 36 parts of iron tailings sand with a particle size of less than 4.75mm for weight adjustment until the design weight is reached.

[0089] Step Six: Assemble and install the concrete cover plate components with the concrete lattice frame components to obtain a 1.1m diameter structure. 1.1m 1.1m, filling rate 75%, mass 3.225 tons, density 2423kg / m³ 3 A cube-shaped mass block.

[0090] Example 2

[0091] Step 1: Weigh out the following materials in order: 13 parts of ordinary silicate PO52.5 cement, 1.23 parts of grade I fly ash, 2.23 parts of S95 grade mineral powder, 1.05 parts of silica fume, 23.7 parts of natural sand with a fineness modulus of 2.5 in zone II gradation, 30.6 parts of small stones with a particle size of 5-15mm, 1.05 parts of steel fiber with a diameter of 0.75mm, 4.18 parts of water, 0.21 parts of polycarboxylate superplasticizer, and 0.21 parts of early strength agent. Mix the above materials in a mixer for 5 minutes to obtain concrete.

[0092] Step 2: Pour concrete into the molds of the cubic mass block lattice frame components and cover plate components with a porosity of 75%, a side length of 1.1m, and a wall thickness of 0.1m, and then vibrate to compact it.

[0093] Step 3: Place the poured concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days.

[0094] Step 4: Weigh out 163.9 portions of pretreated material with a bulk density of 1840 kg / m³. 3 The slag blocks were filled into the concrete lattice frame components, and filled to 98% of the design weight.

[0095] Step 5: Continue filling the concrete lattice frame members with 37 parts of iron tailings sand with a particle size of less than 4.75mm for weight adjustment until the design weight is reached.

[0096] Step Six: Assemble and install the concrete cover plate components with the concrete lattice frame components to obtain a 1.1m diameter structure. 1.1m 1.1m, filling rate 75%, mass 2.67 tons, density 2002kg / m³ 3 A cube-shaped mass block.

[0097] Example 3

[0098] Step 1: Weigh out the following materials in order: 11.9 parts of ordinary silicate PO52.5 cement, 1.42 parts of grade I fly ash, 2 parts of S95 grade mineral powder, 1.7 parts of silica fume, 19.8 parts of natural sand with a fineness modulus of 2.5 in zone II gradation, 29.75 parts of small stones with a particle size of 5-15mm, 2.2 parts of steel fiber with a diameter of 0.75mm, 3.96 parts of water, 0.2 parts of polycarboxylate superplasticizer, and 0.2 parts of early strength agent. Mix the above materials in a mixer for 5 minutes to obtain concrete.

[0099] Step 2: Pour concrete into the molds of the cubic mass block lattice frame components and cover plate components with a porosity of 85%, a side length of 1.055m, and a wall thickness of 0.055m, and then vibrate to compact it.

[0100] Step 3: Place the poured concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days.

[0101] Step 4: Weigh the 392 pre-treated portions with a bulk density of 2400 kg / m³. 3 Iron tailings are filled into concrete lattice frame components and filled to 98% of the design weight.

[0102] Step 5: Continue filling the concrete lattice frame members with 48 parts of iron tailings sand with a particle size of less than 4.75mm for weight adjustment until the design weight is reached.

[0103] Step Six: Assemble and install the concrete cover plate component with the concrete lattice frame component to obtain a 1.055m diameter structure. 1.055m 1.055m, filling rate 80%, mass 2.825 tons, density 2406kg / m³ 3 A cube-shaped mass block.

[0104] Example 4

[0105] Step 1: Weigh out the following materials in order: 11.9 parts of ordinary silicate PO52.5 cement, 1.42 parts of grade I fly ash, 2 parts of S95 grade mineral powder, 1.7 parts of silica fume, 19.8 parts of natural sand with a fineness modulus of 2.5 in zone II gradation, 29.75 parts of small stones with a particle size of 5-15mm, 2.2 parts of steel fiber with a diameter of 0.75mm, 3.96 parts of water, 0.2 parts of polycarboxylate superplasticizer, and 0.2 parts of early strength agent. Mix the above materials in a mixer for 5 minutes to obtain concrete.

[0106] Step 2: Pour concrete into the molds of the cubic mass block lattice frame components and cover plate components with a porosity of 85%, a side length of 1.055m, and a wall thickness of 0.055m, and then vibrate to compact it.

[0107] Step 3: Place the poured concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days.

[0108] Step 4: Weigh out 300 portions of pre-treated material with a bulk density of 1840 kg / m³. 3 The slag blocks were filled into the concrete lattice frame components, and filled to 98% of the design weight.

[0109] Step 5: Continue filling the concrete lattice frame members with 37 parts of iron tailings sand with a particle size of less than 4.75mm for weight adjustment until the design weight is reached.

[0110] Step Six: Assemble and install the concrete cover plate component with the concrete lattice frame component to obtain a 1.055m diameter structure. 1.055m 1.055m, filling rate 80%, mass 2.27 tons, density 1929kg / m³ 3 A cube-shaped mass block.

[0111] Example 5

[0112] Step 1: Weigh out the following materials in order: 14 parts of ordinary silicate PO52.5 cement, 1.8 parts of grade 1 fly ash, 2.6 parts of S95 grade mineral powder, 1.6 parts of silica fume, 17 parts of natural sand with a fineness modulus of 2.5 in zone 2, 31 parts of small stones with a particle size of 5-15mm, 2.9 parts of steel fiber with a diameter of 0.75mm, 3.4 parts of water, 0.18 parts of polycarboxylate superplasticizer, and 0.18 parts of early strength agent. Mix the above materials in a mixer for 5 minutes to obtain concrete.

[0113] Step 2: Pour concrete into the molds of the cubic mass block lattice frame components and cover plate components with a porosity of 90%, a side length of 1.035m, and a wall thickness of 0.035m, and then vibrate to compact it.

[0114] Step 3: Place the poured concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days.

[0115] Step 4: Weigh the 619 pre-treated portions with a bulk density of 2400 kg / m³. 3 Iron tailings are filled into concrete lattice frame components and filled to 98% of the design weight.

[0116] Step 5: Continue filling the concrete lattice frame members with 48 parts of iron tailings sand with a particle size of less than 4.75mm for weight adjustment until the design weight is reached.

[0117] Step Six: Assemble and install the concrete cover plate component with the concrete lattice frame component to obtain a 1.035m diameter structure. 1.035m 1.035m, filling rate 90%, mass 2.675 tons, density 2413kg / m³ 3 A cube-shaped mass block.

[0118] Example 6

[0119] Step 1: Weigh out the following materials in order: 14 parts of ordinary silicate PO52.5 cement, 1.8 parts of grade 1 fly ash, 2.6 parts of S95 grade mineral powder, 1.6 parts of silica fume, 17 parts of natural sand with a fineness modulus of 2.5 in zone 2, 31 parts of small stones with a particle size of 5-15mm, 2.9 parts of steel fiber with a diameter of 0.75mm, 3.4 parts of water, 0.18 parts of polycarboxylate superplasticizer, and 0.18 parts of early strength agent. Mix the above materials in a mixer for 5 minutes to obtain concrete.

[0120] Step 2: Pour concrete into the molds of the cubic mass block lattice frame components and cover plate components with a porosity of 90%, a side length of 1.035m, and a wall thickness of 0.035m, and then vibrate to compact it.

[0121] Step 3: Place the poured concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days.

[0122] Step 4: Weigh out 474 portions of pretreated material with a bulk density of 1840 kg / m³. 3 The slag blocks were filled into the concrete lattice frame components, and filled to 98% of the design weight.

[0123] Step 5: Continue filling the concrete lattice frame members with 37 parts of iron tailings sand with a particle size of less than 4.75mm for weight adjustment until the design weight is reached.

[0124] Step Six: Assemble and install the concrete cover plate component with the concrete lattice frame component to obtain a 1.035m diameter structure. 1.035m 1.035m, filling rate 90%, mass 2.12 tons, density 1908kg / m³ 3 A cube-shaped mass block.

[0125] The beneficial effects of this invention are:

[0126] (1) The present invention adopts the method of filling solid waste in a high-performance concrete frame, which can dispose of a large amount of solid waste, has low requirements for the utilization of solid waste, and the concrete solid ratio is only 25% at most, thereby greatly reducing the cost of the mass block.

[0127] (2) The present invention uses high-performance concrete of grade C80 and above as the frame of the mass block, thereby effectively improving the durability of the mass block and increasing its service life.

[0128] (3) The present invention can design high-performance concrete frames with different structures according to different lifting methods of gravity energy storage, thereby maximizing the use of high-performance concrete strength;

[0129] (4) The present invention can flexibly adjust the weight of a single mass block, thereby controlling the uniformity of the weight of mass blocks produced in the same batch.

[0130] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A method for preparing a mass block of waste concrete for gravity energy storage, characterized in that: The formula for the mass block includes the following components in parts by weight: Pre-treatment of 102-617 portions of high-density solid waste 11-14 parts of ordinary Portland cement 1-2 parts fly ash 1-3 parts mineral powder 1-2 parts silica fume 17-22 parts sand 28.5-31.5 parts of pebbles 1-3 parts steel fiber Water-reducing agent 0.14~0.21 parts Early strength agent 0.14-0.21 parts Water 3.4~4.3 parts; The method for preparing the mass block includes the following steps: (1) Weighing and mixing: According to the set ratio, weigh ordinary Portland cement, fly ash, mineral powder, silica fume, sand, gravel, steel fiber, water, water-reducing agent and early strength agent in sequence, and mix them in the mixer for 5 minutes to obtain concrete; (2) Component casting: The concrete is poured into the pre-prepared lattice frame components and cover plate components molds and compacted by vibration; (3) Component curing: Place the cast concrete lattice frame components and concrete cover plate components under standard curing conditions for 3 days, and then continue curing in the demolding room for no less than 4 days; (4) Solid waste filling: The high-density solid waste is pretreated, and then the weighed pretreated high-density solid waste is filled into the concrete grid frame members to 98% of the design weight; (5) Counterweight adjustment: Continue to fill the concrete lattice frame members with high-density solid waste with a particle size of less than 4.75 mm to adjust the weight until it reaches 100% of the design weight; (6) Cover plate encapsulation: The concrete cover plate component is combined and installed with the concrete lattice frame component to form a closed rectangular mass block.

2. The method for preparing a waste concrete mass block for gravity energy storage according to claim 1, characterized in that: In the above formula, the pretreated high-density solid waste is one or two of the following: ore tailings, construction waste, smelting slag, or other solid waste, and the apparent density of the pretreated high-density solid waste is 1500 kg / m³. 3 ~3000kg / m 3 .

3. The method for preparing a waste concrete mass block for gravity energy storage according to claim 1, characterized in that: In the above formula, the fly ash used is Grade I fly ash, and the mineral powder used is Grade S95 mineral powder.

4. The method for preparing a waste concrete mass block for gravity energy storage according to claim 1, characterized in that: In the above formula, the sand used is natural sand with a fineness modulus of 2.5 in the second zone gradation, and the gravel used is small gravel with a particle size of 5~15mm.

5. The method for preparing a waste concrete mass block for gravity energy storage according to claim 1, characterized in that: In the above formula, steel fibers with a diameter of 0.75 mm are used, and polycarboxylate superplasticizer is used as the water-reducing agent.

6. The method for preparing a waste concrete mass block for gravity energy storage according to claim 1, characterized in that: In step (2) above, the hollowness of the lattice frame components shall not be less than 75%.

7. The method for preparing a waste concrete mass block for gravity energy storage according to claim 1, characterized in that: In step (3) above, the concrete lattice frame members and concrete cover plate members are assembled to form a mass block frame.

8. The method for preparing a waste concrete mass block for gravity energy storage according to claim 1, characterized in that: In step (4) above, the solid waste filling rate in the concrete lattice frame member shall not exceed 98%.

9. The method for preparing a waste concrete mass block for gravity energy storage according to claim 1, characterized in that: In step (4) above, the specific pretreatment process for high-density solid waste before loading is as follows: (4.1) Solid waste classification: The collected high-density solid waste is classified into two types according to two treatment methods: crushable and compactable; (4.2) Solid waste crushing: Crushing crushable high-density solid waste to reduce the particle size to less than 25 mm; (4.3) Particle screening: High-density solid waste particles are screened and sorted according to two particle size ranges: 5mm~15mm and less than 4.75mm. (4.4) Mixed particle size: Mix two particle size ranges of high-density solid waste particles in proportion for later use; (4.5) Solid waste compaction: Compactable high-density solid waste is compacted using a 6000T gantry press for 60 seconds; (4.6) Stacking for later use: Stack the compacted high-density solid waste blocks neatly for later use.

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