Quality detection method for curing agent applied to mine filling

Abstract

The invention belongs to the technical field of curing agent quality detection, and particularly relates to a curing agent quality detection method applied to mine filling, which comprises the following steps: S1, weighing a curing agent, standard sand and clear water; s2, adding clear water into a stirring pot, adding a curing agent, and stirring at a low speed; s3, standard sand is added into the stirring pot, and mortar is prepared; s4, the mortar is divided into two layers to be loaded into a test mold, and compaction and trowelling are carried out; s5, placing the test mold on a rack of a constant-temperature and constant-humidity curing chamber for curing, and demolding; s6, placing the sample in clear water at 20 + / -1 DEG C in a curing chamber for curing; and S7, measuring the compressive strength of the sample. The 3d compressive strength is used as a core detection index of the quality of the curing agent, a standardized material ratio, a preparation process and a test method are designed in a matched manner, optimized compaction and maintenance parameters are combined, and tailings are replaced with standard sand, so that the interference of tailings component fluctuation on a detection result is effectively eliminated, and the quality of the curing agent is ensured. A replicable and generalizable detection standard is provided for mine enterprises, and the industry is assisted to achieve the dual goals of cost reduction, efficiency improvement and safe production.

Description

Technical Field

[0001] The invention belongs to the technical field of curing agent quality detection, and in particular relates to a curing agent quality detection method applied to mine filling. Background Art

[0002] As the development of mineral resources gradually extends to deeper areas, backfill mining has become an important technical direction for metal mining due to its advantages in controlling ground pressure, improving resource recovery rates, and reducing tailings emissions. In the field of lead and zinc mining, cemented backfill technology is particularly critical. Its core lies in consolidating tailings through cementitious materials to form a backfill body with a certain strength to support the goaf and ensure the safety of underground operations. However, the quality stability of cementitious materials (such as cement, curing agents, etc.) directly affects the strength of the backfill body, which in turn determines the safety and economic cost of the mining site. In recent years, curing agents have gradually replaced traditional cement due to their low cost and excellent environmental performance, but the lag in their quality detection methods has become a bottleneck restricting large-scale applications. The specific problems are as follows: While adopting a tailings-based solidifying agent filling process, replacing the traditional cement process, significantly reduced cementitious material costs and increased tailings recovery, the quality testing of the solidifying agent relies on 28-day compressive strength results. Due to a significant disconnect between testing cycles and production cycles, by the time test results are available, the corresponding batch of solidifying agent has already been used for underground filling. Substandard solidifying agent quality can directly lead to insufficient filling strength, potentially causing safety hazards such as goaf collapse and surface subsidence. Furthermore, the mine is unable to promptly trace problematic batches, resulting in wasted costs and accumulated risks.

[0003] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for detecting the quality of a curing agent used in mine filling, so as to solve the problems existing in the prior art in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A method for detecting the quality of a curing agent used in mine filling comprises the following steps: S1. Weigh the curing agent, standard sand and water according to the given weight values: curing agent 450g, standard sand 1350g, water 225g; S2. Add water to the mixing pot of the JJ-5 cement mortar mixer, add the curing agent, and stir at low speed for 30 seconds; S3. Add the standard sand to the mixing pot, maintain the stirring speed, and stir while adding; after it is completely added, stir at high speed for 30 seconds, stop stirring for 90 seconds, then remove the mixing pot, scrape off the curing agent and standard sand attached to the inner wall of the mixing pot with a plastic spoon, fix the mixing pot, and stir at high speed for 60 seconds to obtain mortar; S4. Load the mortar into the test mold in two layers, compact it, scrape off any excess mortar, and smooth the surface of the specimen. S5. Place the test mold on a shelf in a constant temperature and humidity curing room for curing, demold, and number the specimens. S6. Place the specimen in a constant temperature and humidity curing room in clean water (water temperature 20±1°C). S7. Determine the compressive strength of the specimen.

[0006] Furthermore, in step S1, the mass ratio of the curing agent, standard sand and clean water is 1:3:0.5.

[0007] Furthermore, in step S4, when loading the first layer, about 300g of mortar is loaded into each trial mold groove, and a large spreader is used to spread the material layer back and forth along each trial mold groove once, and vibrate it for 60s; when loading the second layer, a small spreader is used to spread the material layer, and vibrate it for 60s.

[0008] Furthermore, in step S5, the mold is demoulded after curing for 16-24 hours.

[0009] Furthermore, in step S6, the sample is wiped flatly upward.

[0010] Furthermore, in step S7, during the compression test, the pressure-bearing surfaces are the two side surfaces of the sample when it is formed, with an area of ​​40 mm×40 mm, and the load is uniformly applied at a rate of 2400±200 N / s until failure.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses 3d compressive strength as the core test indicator for curing agent quality, and is equipped with standardized material ratios, preparation processes, and testing methods. Experimental verification shows that 3d strength and 28d strength show a significant linear correlation, which can shorten the cycle to 1 / 9 of the original method while ensuring test accuracy. In addition, the use of standard sand instead of actual tailings as aggregate, combined with optimized compaction and curing parameters, effectively eliminates the interference of tailings composition fluctuations on test results, providing mining companies with a replicable and scalable test standard, helping the industry achieve the dual goals of cost reduction, efficiency improvement, and safe production. DETAILED DESCRIPTION

[0012] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention.

[0013] Example 1 A method for detecting the quality of a curing agent used in mine filling comprises the following steps: S1. Weigh the curing agent, standard sand and water according to the given weight values: curing agent 450g, standard sand 1350g, water 225g; S2. Add clean water to the mixing pot of a JJ-5 cement mortar mixer, add cement, and stir at low speed for 30 seconds; S3. Add the standard sand to the mixing pot, maintain the stirring speed, stirring while adding; after it is completely added, stir at high speed for 30s, stop stirring for 90s, and then stir at high speed for 60s to obtain mortar; S4. Load the mortar into the test mold in two layers, vibrate and compact it, scrape off any excess mortar, and smooth the surface of the specimen. Specifically: When loading the first layer, place approximately 300g of mortar into each test mold slot (size 40mm×40mm×160mm). Use a large spreader to spread the mortar layer back and forth along each test mold slot, leveling it and vibrating it for 60 seconds. When loading the second layer, use a small spreader to spread the mortar layer, leveling it and vibrating it for 60 seconds. Use a metal ruler at a 90° angle to cut at one end of the top of the test mold, then slowly move horizontally along the length of the test mold toward the other end, scraping off any mortar that exceeds the test mold. Use the same ruler to smooth the surface of the specimen horizontally. S5. After removing the mortar from around the test mold, place the mold on a shelf in a constant temperature and humidity curing room for 24 hours, ensuring that moist air contacts all sides of the mold. Remove the mold and number the specimens. The curing room temperature is 20±2°C and the humidity is ≥95%. S6. Place the specimen horizontally in clean water (20±1°C) in a constant temperature and humidity curing room for curing, with the flat surface facing upward. S7. After curing, measure the compressive strength of the specimens. Specifically, during the compressive test, the compressive surfaces are the two sides of the specimen as formed, with an area of ​​40 mm × 40 mm. Apply a uniform load at a rate of 2400 ± 200 N / s until failure.

[0014] The test set the mass ratio of curing agent, standard sand and clean water to be 1:16:5.67 as the control, and measured the compressive strength at 3d, 7d and 28d. The results are shown in Table 1.

[0015] Table 1 Comparison of the quality test results of the curing agent of the present invention and the control test method

[0016] As can be seen from Table 1, the compressive strength after 3 days of curing when the mass ratio of the curing agent to the standard sand is set to 1:3 in the present invention is significantly linearly correlated with the compressive strength after 28 days of curing when the mass ratio of the curing agent to the standard sand is set to 1:16. In this way, the cycle can be shortened to 1 / 9 of the original method while ensuring the detection accuracy.

[0017] In this embodiment, standard sand was purchased from Xiamen Aisiou Standard Sand Co., Ltd., with a particle size range of 0.08-2 mm and implemented in accordance with GB / T17671-1999. JJ-5 cement mortar mixer low speed 140±5r / min, high speed 285±10r / min; When vibrating, a ZS-15 cement mortar vibrating table is used, with an amplitude (drop distance) of 15mm±0.3mm; The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for detecting the quality of a curing agent used in mine filling, characterized in that: The following steps are involved: S1. Weigh the curing agent, standard sand and water according to the given weight values: curing agent 450g, standard sand 1350g, water 225g; S2. Add clean water to the mixing pot of a JJ-5 cement mortar mixer, add the curing agent, and stir at low speed for 30 seconds; S3. Add the standard sand to the mixing pot, maintain the stirring speed, and stir while adding; after it is completely added, stir at high speed for 30 seconds, stop stirring for 90 seconds, then remove the mixing pot, scrape off the curing agent and standard sand attached to the inner wall of the mixing pot with a plastic spoon, fix the mixing pot, and stir at high speed for 60 seconds to obtain mortar; S4. Load the mortar into the test mold in two layers, compact it, scrape off any excess mortar, and smooth the surface of the specimen. S5. Place the test mold on a shelf in a constant temperature and humidity curing room for curing, demold, and number the specimens. S6. Place the sample in clean water in a constant temperature and humidity curing room for curing; S7. Determine the compressive strength of the specimen.

2. The method for detecting the quality of a curing agent for mine filling according to claim 1, characterized in that: In step S1, the mass ratio of the curing agent, standard sand and clean water is 1:3:0.

5.

3. The method for detecting the quality of a curing agent for mine filling according to claim 1, wherein: In step S4, when loading the first layer, about 300 grams of mortar is loaded into each trial mold groove, and the large spreader is used to spread the material layer back and forth along each trial mold groove once, and vibrate it for 60 seconds; when loading the second layer, the small spreader is used to spread the material layer flat, and vibrate it for 60 seconds.

4. The method for detecting the quality of a curing agent for mine filling according to claim 1, wherein: In step S5, the mold is removed after curing for 16-24 hours.

5. The method for detecting the quality of a curing agent for mine filling according to claim 1, wherein: In step S6, the sample is wiped flatly upward.

6. The method for detecting the quality of a curing agent for mine filling according to claim 1, wherein: In step S7, during the compression test, the compression surfaces are the two side surfaces of the sample when it is formed, with an area of ​​40 mm×40 mm, and the load is uniformly applied at a rate of 2400±200 N / s until failure.

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