Method for preparing cementing material based on mine solid waste
By mixing materials such as desulfurization gypsum, smelting slag, solid waste powder and low-thermal solid waste particles, forming gelled materials for backfill, solving the problem of insufficient backfill density and achieving a high-strength, stable and reliable backfill effect.
Patent Information
- Application Number
- CN202510242579.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-05-09
AI Technical Summary
In the backfilling process of the abutment, culvert and tunnel sides, the compaction density is prone to insufficient, resulting in natural settlement and vehicle jump, affecting the safety of opening to traffic.
Desulfurization gypsum, smelting slag, solid waste powder and low-thermal solid waste particles are used to form solid waste-based mixture, combined with cement, water and water reducing agent to form gelled materials in a fluid or fluid-plastic state, backfilling and solidifying.
It forms a stable calcified structure with high strength to ensure the compactness and backfilling strength of the backfilling result. The solidification process will not cause damage to the original structure, and the structure is stable and reliable.
Abstract
Description
Technical Field
[0001] The invention relates to a method for preparing a cementitious material by utilizing mining solid waste, and belongs to the technical field of solid waste utilization. Background Art
[0002] At present, in the construction of existing bridge abutments, culvert sides and tunnel side backfilling projects, crushed stone soil, lime soil, cement soil and other materials are generally used for backfilling. In the backfilling process, the backfilling materials need to be compacted layer by layer, but the compaction density is often insufficient, resulting in natural settlement in the later stage, causing the abutment, culvert back slab jump platform, road bridge, road culvert jumping phenomenon, which has an adverse impact on traffic safety. Summary of the invention
[0003] In order to solve the technical problems existing in the prior art, the present invention provides a method for making cementitious materials based on mining solid waste, which uses solid waste materials to make cementitious materials, uses the cementitious materials for backfilling, and automatically forms dense materials after solidification to meet the backfilling requirements.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a method for making cementitious materials based on the use of mining solid waste. The method is operated according to the following steps: desulfurized gypsum, smelting slag, solid waste powder, and low-heat solid waste particles are mixed to obtain a solid waste-based mixture, and then the solid waste-based mixture, cement, water and water reducer are mixed in a ratio of 1:1:0.25:0.01, and the mixing is carried out as needed in a ready-to-use mixing method.
[0005] Preferably, the desulfurization gypsum, smelting slag, solid waste powder and low-heat solid waste particles are mixed in equal proportions according to particle size. The particle size of the desulfurization gypsum is 1-5mm, the particle size of the smelting slag is 10-20mm, the particle size of the solid waste powder is 150-200 mesh, and the low-heat solid waste particles are low-heat solid waste particles with a calorie content of less than 500 kcal, and the particle size of the low-heat solid waste particles is 5-15mm.
[0006] Preferably, the desulfurized gypsum, smelting slag, solid waste powder and low-heat solid waste particles are mixed in a ratio of 1:1:1:1.
[0007] Compared with the prior art, the present invention has the following technical effects: the present invention adopts solid waste-based mixture, cement, water and water reducing agent to form a gelling material in a fluid state or a plastic state, and then backfills the gelling material to the abutments, both sides of the culvert and the sides of the tunnel. After self-compacting, it can form a stable calcified structure with high strength, ensuring the density and backfill strength of the backfill result; at the same time, the gelling material changes from a fluid state to a solid state, and will not cause damage to the original structure body in this process, and after solidification, the structure is stable and reliable. DETAILED DESCRIPTION
[0008] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0009] Example 1, a method for making cementitious materials based on the use of mining solid waste, the operation is carried out according to the following steps, desulfurized gypsum, smelting slag, solid waste powder, and low-heat solid waste particles are mixed to obtain a solid waste-based mixture, and then the solid waste-based mixture, cement, water and water reducing agent are mixed in a ratio of 1:1:0.25:0.01, and the mixing is carried out as needed in a ready-to-use mixing method.
[0010] Among them, desulfurization gypsum, smelting slag, solid waste powder and low-heat solid waste particles are mixed in proportion to particle size, that is, by weight, desulfurization gypsum, smelting slag, solid waste powder and low-heat solid waste particles are mixed in a ratio of 1:1:1:1, among which the particle size of desulfurization gypsum is 1-5mm, the particle size of smelting slag is 10-20mm, the particle size of solid waste powder is 150-200 mesh, and the low-heat solid waste particles are low-heat solid waste particles with a calorie content of less than 500 kcal, and the particle size of the low-heat solid waste particles is 5-15mm.
[0011] The present invention effectively utilizes industrial wastes such as desulfurized gypsum, smelting slag, solid waste powder and low-heat solid waste particles, reduces the occupation and pollution of these solid wastes to the environment, and reduces the dependence on traditional building materials such as natural sand and stone, thereby realizing the recycling of resources. At the same time, desulfurized gypsum can provide early strength, react with tricalcium aluminate in cement to form calcium sulfonate, so that the backfill material can obtain a certain strength in the early stage. Under the stimulation of cement hydration products, the active ingredients in the smelting slag will continuously undergo hydration reactions to generate substances with gelling properties, thereby improving the later strength of the backfill material and meeting the strength requirements of the backfill. In addition, desulfurized gypsum can also accelerate the hydration of cement and shorten the initial setting time, while low-heat solid waste particles can appropriately extend the final setting time, providing a more suitable operation time window for construction. At the same time, the hydration heat of the material is low, which can reduce problems such as cracking caused by excessive hydration heat, and is particularly suitable for large-volume backfill projects.
[0012] In addition, the micro-aggregate filling effect of solid waste powder and low-heat solid waste particles can make the material structure more compact, reduce porosity, and improve impermeability, thereby reducing the erosion of external harmful media on the backfill. On the other hand, the stable hydration products formed by components such as smelting slag during the hydration process also help to improve the material's anti-corrosion ability and volume stability, ensuring the stable performance of the backfill during long-term use.
[0013] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims
1. A method for producing cementitious materials based on the use of mining solid waste, characterized in that: Follow the steps below to mix desulfurized gypsum, smelting slag, solid waste powder and low-heat solid waste particles to obtain a solid waste-based mixture, then mix the solid waste-based mixture, cement, water and water reducing agent in a ratio of 1:1:0.25:0.01, and mix as needed in a ready-to-use mixing method.
2. The method for producing cementitious materials by utilizing mining solid waste according to claim 1, characterized in that: The desulfurized gypsum, smelting slag, solid waste powder and low-heat solid waste particles are mixed in equal proportions according to particle size. The particle size of the desulfurized gypsum is 1-5mm, the particle size of the smelting slag is 10-20mm, the particle size of the solid waste powder is 150-200 mesh, and the low-heat solid waste particles are low-heat solid waste particles with a heat value of less than 500 kcal, and the particle size of the low-heat solid waste particles is 5-15mm.
3. The method for producing cementitious materials by utilizing mining solid waste according to claim 2, characterized in that: The desulfurized gypsum, smelting slag, solid waste powder and low-heat solid waste particles are mixed in a ratio of 1:1:1:1.