Tailing pond tailing recycling building material

Abstract

The invention relates to a tailing pond tailing recycling building material which is mainly characterized by consisting of tailing pond tailings, a gel material and water, and the particle size of the tailing pond tailings is less than or equal to 2mm. According to the tailings recycling building material for the tailings pond, under the condition that no coarse and fine aggregate grading support exists, the tailings are independently used as aggregate to make bricks, and a finished product has certain strength and conforms to low-strength building material application scenes such as temporary buildings and roadbed cushions; meanwhile, in the recycling process, toxic and harmful heavy metals and mineral separation residues contained in the tailings can be solidified by the cementing material, so that the pollution release risk to the external environment is greatly reduced, the problem of precipitation of the heavy metals in the tailings is solved, the surrounding pollution hidden danger is eliminated, and low-cost building materials are provided for capital construction. And double improvement of environmental benefits (pollution is avoided) and economic benefits (building material and disposal cost is reduced) is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bulk solid waste treatment, and particularly relates to tailings sand resource building materials of tailings pond. BACKGROUND

[0002] The tailings sand left by mining belongs to "bulk solid waste", which is the product after the beneficiation process (such as flotation, nodular, etc.), and the particles are extremely fine and uniform in size after flotation, ball milling and other process treatments. The tailings sand contains toxic and harmful heavy metals and beneficiation residues, which will continue to penetrate and pollute the surrounding groundwater, soil and biological environment if stored in the storage area for a long time, and is a typical "potential persistent pollution source".

[0003] The treatment of tailings sand in the industry is mostly "storage in the storage area and closed storage", for example, a tailings sand storage area is built near the mining area (far away from the city), and the tailings sand is stored in the storage area. After the storage area is full, the site is closed and monitored for a long time, and there is almost no attempt to resource utilization.

[0004] The resource utilization of tailings sand has technical and economic double obstacles. From the technical point of view, the tailings sand particles are too fine and have no structural support, which does not meet the core requirement of traditional building materials "coarse and fine aggregate grading" (such as conventional brick making, concrete, etc. need coarse and fine aggregate matching to ensure strength), and cannot be directly used for building material production. From the economic point of view, the cost of tailings sand resource utilization is much higher than the benefit (long-distance transportation + poor material), and no market subject is willing to invest, resulting in a long-term blank of resource utilization path.

[0005] Some tailings sand storage areas are located near "the area to be submerged by the reservoir", if not treated in advance, the rising water level of the reservoir or the long-term surface water runoff will cause the continuous migration and diffusion of pollutants in the tailings sand, polluting the water body of the reservoir (the reservoir undertakes the functions of downstream water supply and hydropower), so the tailings sand must be excavated and "relocated" in other places. However, the amount of tailings sand is huge (several hundred thousand tons to one million tons), and simple "relocation" still needs to build a new storage area, which has a very high cost (including transportation, new storage construction, etc.). It is only a spatial transfer of pollution medium, and cannot realize the treatment or effective utilization of this part of tailings sand (waste), which is still a negative resource and occupies a large amount of land resources.

[0006] Therefore, if the tailings sand can be resourceized and then converted into building materials that can be used for reservoir construction, the two problems of "high cost of tailings sand relocation" and "shortage of building materials for infrastructure construction" can be solved, forming a "disposal-utilization" synergistic value. SUMMARY

[0007] The main purpose of the present application is to solve the above problems, and provide a tailings sand resource building material of tailings pond.

[0008] The purpose of this invention is to provide a building material for the resource utilization of tailings from tailings ponds. Its main feature is that it is composed of tailings from tailings ponds, gel materials and water, wherein the particle size of the tailings from tailings ponds is ≤2mm.

[0009] Preferably, the tailings in the tailings pond account for 70% to 75% of the total weight of the tailings and gel material in the tailings pond.

[0010] Preferably, the gel material is a solid waste gel material.

[0011] Preferably, the water-cement ratio is 7.5% to 8.1%.

[0012] Preferably, the building material is a building brick, which is formed by mixing and stirring tailings, gel material and water in a tailings pond for 10-15 minutes and then pressing it into a mold.

[0013] The tailings dam tailings resource recovery building material of the present invention enables tailings to be used as aggregate to make bricks without the support of coarse and fine aggregate gradation. The finished product has a certain strength and is suitable for low-strength building material application scenarios, such as temporary buildings and roadbed subbase. At the same time, the cementing material in the resource recovery process will solidify the toxic and harmful heavy metals and mineral processing residues in the tailings, thereby greatly reducing the risk of pollution release to the external environment, solving the problem of heavy metal precipitation in tailings, eliminating the surrounding pollution hazards, and providing low-cost building materials for infrastructure construction, thus achieving a dual improvement in environmental benefits (eliminating pollution) and economic benefits (reducing building material and disposal costs). Attached Figure Description

[0014] Figure 1 This is a process flow diagram of the preparation process of building bricks for the resource utilization of tailings in tailings ponds according to the present invention. Detailed Implementation

[0015] To provide a clearer understanding of the technical content of this invention, the following embodiments are provided in detail. However, it is important to note that these descriptions are merely for further illustrating the features and advantages of this invention, and not for limiting the scope of the claims. Example

[0016] like Figure 1 As shown, the tailings dam tailings resource utilization building bricks of the present invention are prepared. The proportions of tailings, gelling materials and water-cement ratio of the tailings dam are shown in Table 2 below. The water-cement ratio is the amount of water added, that is, the ratio of the weight of water added to the total weight of tailings and gelling materials. For example, if the total weight of tailings and gelling materials is 10 kg, a 10% water-cement ratio means that the weight of water is 1 kg.

[0017] The tailings used in the tailings dam have the following particle size distribution, physical properties in their natural state, and organic matter content, as shown in Table 1 below.

[0018] ; The gel material uses a full solid waste gel material meeting the Application Technology Standard of Full Solid Waste High Performance Concrete.

[0019] The prepared building bricks were tested for compressive strength according to the provisions of the Test Methods for Concrete Blocks and Bricks GB / T 4111, and the results showed that the strength grade of the WS17-04 group and the WS17-06 group was MU10 or above, meeting the basic requirements for building bricks. The specific results are shown in Table 2 below.

[0020] ; The hazard removal was carried out according to the Solid Waste Leaching Toxicity Leaching Method Horizontal Oscillation Method (HJ 557-2010), and the results are shown in Table 3 below: ; As can be seen from Table 3 above, after the tailings were solidified with the cementitious material, the leaching concentration reduction rate of the harmful pollutants in the tailings could reach 99%. The leaching concentration of the resource bricks could meet the water quality standard limit value of Class IV in the Environmental Quality Standard for Surface Water (GB 3838-2002), the maximum allowable discharge concentration in the Comprehensive Sewage Discharge Standard (GB 8978-1996), and the heavy metal content limit value standard in the Cement Kiln Co-processing of Solid Waste Technical Specification (GB / T 30760-2024).

[0021] In this specification, the present application has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can still be made without departing from the spirit and scope of the present application. Therefore, the specification should be considered as illustrative rather than limiting.

Claims

1. A tailings pond tailings resource building material, characterized in that, The tailings pond tailings have a particle size of less than or equal to 2 mm.

2. The tailings pond tailings resource building material of claim 1, wherein, The tailings pond tailings account for 70% to 75% of the total weight of the tailings pond tailings and the gel material.

3. The tailings pond tailings resource building material of claim 1, wherein, The gel material is a full solid waste gel material.

4. The tailings pond tailings resource building material of claim 1, wherein, The water-cement ratio is 7.5% to 8.1%.

5. The tailings pond tailings resource building material of claim 1, wherein, The building material is a building brick, and the tailings pond tailings, the gel material and the water are mixed and stirred for 10 to 15 minutes, and then the building brick is formed by pressing in a mold.

Images