Clinker-free solid waste cementing material and preparation method thereof

Abstract

The invention aims to provide a clinker-free solid waste cementing material and a preparation method thereof in order to meet the requirement of ecological restoration. The clinker-free solid waste cementing material is prepared from the following raw materials in percentage by weight: 80-90% of superfine slag powder, 5-10% of industrial byproduct gypsum and 5-10% of an additive, the additive is sulphoaluminate material solid powder. The product solves the problem of filling underground mining space, open-pit mining surface excavation areas, soil sampling areas, underground mining subsidence areas and natural hollow areas by using a cementing material prepared from common industrial solid wastes instead of cement and other production materials.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a clinker-free solid waste cementitious material and a preparation method thereof. Background Art

[0002] The large-scale landfill or storage of industrial solid waste has caused serious pollution to the air, land and water. At present, the stockpile of industrial solid waste in my country is huge, and the annual new stockpile is also increasing. my country's bulk industrial solid waste is mainly tailings, fly ash, coal gangue, smelting waste, coal-fired slag and desulfurized gypsum, accounting for nearly 70% to 80% of the total industrial solid waste. Under the guidance of the "dual carbon" goal, it has become an inevitable trend to carry out comprehensive utilization of solid waste resources through multiple paths.

[0003] In order to prevent and control environmental pollution, improve the quality of ecological environment, and promote the advancement of storage and landfill technology of general industrial solid waste, all regions encourage the use of cementitious materials made from general industrial solid waste to replace cement and other production materials to fill underground mined spaces, surface excavation areas of open-pit mining, borrow sites, underground mining subsidence areas, and natural pits in projects such as reclamation, landscape restoration, construction land leveling, agricultural land leveling, and landform protection to prevent surface collapse. In addition, the development of new low-carbon cementitious materials is accelerated, and carbon-fixing mineral materials and new cementitious materials that do not require burning of all solid waste are encouraged.

[0004] Therefore, developing existing industrial solid waste resources into cementitious materials suitable for filling mined-out areas is a two-pronged approach for ecological restoration. Summary of the invention

[0005] The purpose of the present invention is to provide a non-clinker solid waste cementitious material and its preparation method for the needs of ecological restoration. The product solves the problem of using cementitious materials made from general industrial solid waste to replace cement and other production materials to fill underground mined spaces, surface excavation areas of open-pit mining, borrow pits, underground mining subsidence areas and natural potholes.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A clinker-free solid waste cementitious material, comprising the following raw materials in percentage by weight: 80-90% slag powder, 5-10% industrial by-product gypsum and 5-10% additives;

[0008] The additive is solid powder of sulphoaluminate material.

[0009] Furthermore, in the above-mentioned clinker-free solid waste cementitious material, the slag powder is of S95 grade.

[0010] Furthermore, in the above-mentioned clinker-free solid waste cementitious material, the industrial by-product gypsum is selected from any one of desulfurized gypsum and fluorinated gypsum.

[0011] The present invention also provides a method for preparing a cementitious material without clinker solid waste:

[0012] Mix slag powder S95, industrial by-product gypsum solid powder and additive solid powder, and stir them evenly with a mixing agitator.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The raw materials used in this clinker-free solid waste cementitious material are all from solid waste materials, which are environmentally friendly and low-carbon, reduce costs, and make full use of the advantages of industrial solid waste materials themselves. Compared with traditional processes, it reduces the hot air heating system and grinding process. It only needs to mix, stir and homogenize the raw materials. No chemical reagents and high-temperature calcination are required. It is an environmentally friendly and sustainable cementitious material.

[0015] 2. The gel material of the present invention has a simple process, is less difficult, takes less time, occupies a small area, and is easy to operate and maintain. DETAILED DESCRIPTION

[0016] The present application is further described in detail below in conjunction with the embodiments. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0017] Example 1

[0018] A clinker-free solid waste cementitious material is composed of the following raw materials in percentage by weight: 80% of S95 grade slag powder, 10% of industrial by-product gypsum and 10% of sulphoaluminate material.

[0019] Its preparation method is:

[0020] Mix slag powder S95, industrial by-product gypsum solid powder and additive solid powder, and stir them evenly with a mixing agitator.

[0021] Example 2

[0022] A clinker-free solid waste cementitious material is composed of the following raw materials in percentage by weight: 85% of S95 grade slag powder, 10% of industrial by-product gypsum and 5% of sulphoaluminate material.

[0023] Its preparation method is:

[0024] Mix slag powder S95, industrial by-product gypsum solid powder and additive solid powder, and stir them evenly with a mixing agitator.

[0025] Example 3

[0026] A clinker-free solid waste cementitious material is composed of the following raw materials in percentage by weight: 85% of S95 grade slag powder, 8% of industrial by-product gypsum and 7% of sulphoaluminate material.

[0027] Its preparation method is:

[0028] Mix slag powder S95, industrial by-product gypsum solid powder and additive solid powder, and stir them evenly with a mixing agitator.

[0029] Example 4

[0030] A clinker-free solid waste cementitious material is composed of the following components in parts by weight: 90% of S95 grade slag micropowder, 5% of industrial by-product gypsum and 5% of sulphoaluminate material.

[0031] Its preparation method is:

[0032] Mix slag powder S95, industrial by-product gypsum solid powder and additive solid powder, and stir them evenly with a mixing agitator.

[0033] In summary, the raw material compositions of the non-clinker solid waste cementitious materials in Examples 1-4 are shown in the following table:

[0034]

[0035] The clinker-free solid waste cementitious material of the above-mentioned embodiment was tested with reference to the GB / T17671-1999 cement mortar strength test method and the GB / T1346-2001 cement standard consistency water consumption, setting time, and stability test method.

[0036] Comparing Examples 1-4, the compression and flexural properties of the clinker-free solid waste cementitious material of the present invention are stable, and the initial setting and final setting times are both maintained within 60 minutes. Among them, it is concluded that Example 1 has the best effect, and Example 2 has the best ratio in terms of cost performance.

[0037] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A non-clinker solid waste cementitious material, characterized in that: The invention is composed of the following raw materials in percentage by weight: 80-90% slag powder, 5-10% industrial by-product gypsum and 5-10% additives; The additive is solid powder of sulphoaluminate material.

2. The clinker-free solid waste cementitious material according to claim 1, characterized in that: The slag powder is of S95 grade.

3. The clinker-free solid waste cementitious material according to claim 1, characterized in that: The industrial by-product gypsum is selected from any one of desulfurized gypsum and fluorinated gypsum.

4. The method for preparing a clinker-free solid waste cementitious material according to claim 1, characterized in that: Mix slag powder S95, industrial by-product gypsum solid powder and additive solid powder, and stir evenly with a mixing agitator.

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