CN112250412B - A method for solidifying high-viscosity slag as backfill - Google Patents

Description

A method for solidifying high-viscosity slag as backfill

technical field

The invention relates to the technical field of high-viscosity slag treatment, in particular to a method for solidifying high-viscosity slag and using it as a backfill.

Background technique

At present, my country's subway and other infrastructure construction (such as urban integrated pipe gallery, pipe network, underground express passage, pipe jacking construction, etc.) is developing rapidly, with large scale and fast speed. Among them, the shield method is recognized by the industry as the best interval tunnel construction method due to its advantages of safety, high efficiency and strong stratum adaptability, which will inevitably produce a huge amount of shield dregs. For hard rock TBM excavation shield slag and mud-water balance shield slag, the resource disposal process is relatively mature, and the difficulty of resource utilization is relatively small. Balanced shield muck is in the form of "paste", and its dehydration and screening are extremely difficult, which increases the difficulty of resource utilization and reduces the added value. The existing disposal method is generally open-air disposal. In particular, for some soft and sticky shield slag containing more clay particles, there are problems such as softening in contact with water and high viscosity. The open storage is more harmful, and the high-value utilization is difficult or expensive.

To sum up, it is necessary to explore a fast and efficient disposal method of high-viscosity muck. For example, if it is solidified and used as backfill for station roofs, etc., local disposal and backfilling will increase its added value while disposing of high-viscosity slag. However, the existing curing method has a long curing time and poor curing effect for high-viscosity slag containing more clay particles. It usually takes 7 days to achieve the basic curing backfill strength, and it is difficult to achieve simultaneous backfilling, resulting in reduced resource utilization benefits. Therefore, if the high-viscosity slag is quickly and efficiently solidified as a backfill, it will save the slag disposal fee, and at the same time obtain higher economic and environmental benefits, which is of great significance.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems that the high-viscosity slag is difficult to dispose of, and the existing solidification methods have poor solidification effect, long time, high cost, and difficulty in high-value resource utilization.

In order to solve the above-mentioned technical problems, the present invention proposes a method for solidifying high-viscosity slag as backfill, and the specific scheme is as follows:

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh the high-viscosity slag, and test its moisture content;

S2, according to the moisture content obtained in step S1, add moisture that is 5-15 percentage points higher than the moisture content of the high-viscosity slag, and stir until it is uniform to form a slurry;

S3, adding the curing agent within 6.1 wt% into the uniform slurry prepared in step S2, and stirring evenly to obtain a solidified backfill;

Wherein, in the high-viscosity slag, the content of clay particles with a particle size of less than 5 μm is more than 30%, and the viscosity is greater than 5000 Pa·S; the curing agent is composed of the following components in parts by weight:

In some embodiments, the content of clay particles with a particle size of less than 5 μm in the high-viscosity slag soil is greater than or equal to 35%, and the content of particles with a particle size of less than or equal to 75 μm is greater than or equal to 85%.

In some embodiments, the high viscosity soil has a moisture content of 18-35%.

In some embodiments, the curing agent is added to the homogeneous slurry and stirred evenly, and after natural curing at room temperature for 3 d, the compressive strength of the cured backfill reaches more than 0.8 MPa, which meets the requirements of the backfill.

In some embodiments, the mesh number of the granulated blast furnace slag is 200-400 mesh.

In some embodiments, the calcium content of the quicklime is >90%, and the fineness is 200 mesh pass rate >70%.

In some embodiments, the sodium carbonate is a solid powder with a mesh number of 150-200 mesh.

In some embodiments, the sodium silicate is a white solid powder, the modulus is 2.3-3.0, the fineness is 100 mesh, and the dissolution time is 220s.

In some embodiments, the raw gypsum mesh is 300-400 mesh, and the whiteness is greater than 90%.

Preferably, the highly viscous slag is slag excavated from a subway shield tunnel section or station.

Preferably, in step S2, using low-speed stirring, the high-viscosity slag is dispersed and stirred evenly, and the stirring speed is 45r/min.

Preferably, in step S3, high-speed stirring is used to fully mix the curing agent and the slag material and stir evenly, and the stirring speed is 120 r/min.

Compared with the prior art, the beneficial effects of the present invention are:

The high-viscosity slag has the characteristics of being softened by water. In the present invention, before adding a curing agent to the high-viscosity slag, a corresponding amount of water is added to overcome the problem that the high-viscosity slag is difficult to mix evenly with the curing agent, so that it is softened after being soaked in water. It is loose, fully contacted with the curing agent and stirred evenly to improve the curing effect. Under the condition that the dosage of the curing agent is low (<6.1wt%), the compressive strength of the prepared specimen can reach 0.8MPa after natural curing at room temperature for 3d Above, the 7d compressive strength can reach more than 1.2MPa, which meets the strength requirements of backfill. Compared with the problems of long curing time, high cost and poor curing effect of the existing curing method, the invention has the characteristics of high curing strength, fast curing speed and good curing effect, can realize synchronous backfilling on the construction site, shorten the construction period of backfilling, and The solidification cost is low, the problems of difficult disposal of high-viscosity slag and high-value resource utilization are solved, and it has high economic and environmental benefits.

The present invention also has the following advantages:

(1) It does not need to be used with cement, and the curing effect is better than that of PO42.5 cement. The basic backfill strength requirements can be achieved after natural curing for 3d, which is conducive to shortening the construction period, and is efficient and environmentally friendly;

(2) Make full use of the characteristics of high-viscosity slag that softens when exposed to water, and additionally add the corresponding amount of water to the slag to overcome the problem that it is difficult to mix with the curing agent. Fully contact and stir evenly to improve the curing effect;

(3) The solidification cost of slag per cubic meter is within 85 yuan. Compared with the current mudstone slag disposal cost of 150 yuan per cubic meter and above at the construction site, the economic benefit is obvious.

Description of drawings

The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way, in which:

FIG. 1 is a graph showing the particle size distribution of the highly viscous slag (mudstone slag) used in Examples 1-3 and Comparative Examples 1-7 of the present invention.

Figure 2 is the XRD spectrum of the mudstone slag used in Examples 1-3 and Comparative Examples 1-7 of the present invention.

3 is a uniaxial compressive stress-strain curve diagram of mudstone slag made into a solidified specimen in Example 1 of the present invention and cured at room temperature for 3d and 7d.

FIG. 4 is a uniaxial compressive stress-strain curve diagram of Example 2 of the present invention after mudstone slag is made into a solidified specimen and cured at room temperature for 3d and 7d.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation disclosed below.

This specific embodiment proposes a method for solidifying high-viscosity slag and using it as backfill. The mudstone slag (high-viscosity slag) in the following specific embodiments, examples and comparative examples is taken from the second working area of Nanning Metro Line 5 The original slag material in a certain interval was measured to have an initial moisture content of 22%. As shown in Figure 1, which is the particle size distribution curve of the mudstone slag, it can be seen that the content of clay (calculated as particles less than 5 μm) is 45%, and the content of particles below 75 μm is 94%, resulting in high viscosity. After the rheometer test, at room temperature, the highest viscosity value measured at a rotational speed of 60 rpm is 8205 Pa·S. As shown in Figure 2, its XRD spectrum, it can be seen that its main mineral components are quartz, mica, kaolinite and chlorite; after testing, the main chemical components and proportions are SiO ₂ : 62.7%, Al ₂ O ₃ : 19.0%, Fe ₂ O ₃ : 9.93%.

The curing agent components used in the following specific embodiments, examples and comparative examples, the specific parameters are as follows:

The mesh number of granulated blast furnace slag is 200; the fineness of quicklime is 200 mesh, the pass rate is 80%, and the calcium content is 91%; the mesh number of sodium carbonate is 150; the modulus of sodium silicate powder is 2.85, and the fineness is 100 mesh The sieving rate is 98.5%; the mesh number of raw gypsum is 300, and the whiteness is 95%.

Before mixing the curing agent in the present invention, a corresponding amount of water is added to the slag to overcome the problem that the high-viscosity slag is difficult to mix with the curing agent, so that it softens and loosens after soaking in water, so as to fully contact the curing agent and stir evenly.

Therefore, a study of the optimum water mixing amount is included. At the same time, in order to ensure the solidification cost, first select granulated blast furnace slag, quicklime, sodium carbonate and sodium silicate as the curing agent, as follows:

Take 2000g of mudstone slag, add (1): 800g water, (2): 600g water, (3): 400g water, (4): 350g water, (5): 300g water, (6): 250g water, (7): 200g of water, stir evenly with a small mixer at a speed of 45r/min, then add 116g of curing agent and stir evenly at a speed of 120r/min to obtain the final curing material, pour into the triplex of 70.7*70.7*70.7mm In the mold, the uniaxial compressive strength was tested after natural curing at room temperature for 7d. Among them, the curing agent is composed of 80g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate and 6g of sodium silicate powder evenly stirred.

After testing, the 7d compressive strengths of groups (1)-(7) were 0.100MPa, 0.423MPa, 0.445MPa, 0.460MPa, 0.587MPa, 0.770MPa, and 0.993MPa, respectively. In addition, the 3d compressive strengths of the groups (6) and (7) were 0.657 MPa and 0.743 MPa, respectively.

It can be seen from the above results that the 7d compressive strength of group (6) is close to 0.8 MPa, and the 7d compressive strength of group (7) exceeds 0.8 MPa, but its 3d compressive strength is all lower than 0.8 MPa, which cannot meet the requirements of recovery. Basic strength requirements of fillers.

In order to further improve the solidification strength of mudstone slag, increase the raw gypsum, and optimize the composition and mixing ratio of the solidifying agent to achieve the best solidification effect on the premise of ensuring the maximum water content and stirring effect, and ensuring the solidification cost.

In order to further specifically illustrate a method for solidifying high-viscosity slag and using it as a backfill proposed by the present invention, the following examples are given for detailed description.

Example 1

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 80 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 5 g of raw gypsum, mix and stir evenly, and set aside. In addition, 200 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (200g) that is 12.2 percentage points higher than the moisture content of the mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 6.05% (121 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold. After testing, its 3d and 7d average compressive strengths are 0.997MPa and 1.202MPa, respectively. As shown in FIG. 3 , FIG. 3 is a uniaxial compressive stress-strain curve diagram of the high-viscosity slag solidified backfill specimen of Example 1 after natural curing at room temperature for 3d and 7d.

Example 2

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 70 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 7.5 g of raw gypsum, mix and stir evenly, and set aside. In addition, 200 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (200g) that is 12.2 percentage points higher than the moisture content of the mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 5.675% (113.5 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold. After testing, its 3d and 7d average compressive strengths are 0.890MPa and 1.280MPa, respectively. As shown in FIG. 4 , FIG. 4 is a uniaxial compressive stress-strain curve diagram of the high-viscosity slag solidified backfill specimen of Example 2 after natural curing at room temperature for 3d and 7d.

Example 3

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 70 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 10 g of raw gypsum, mix and stir evenly, and set aside. In addition, 200 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (200g) that is 12.2 percentage points higher than the moisture content of the mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 5.80% (116 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold, and cured naturally at room temperature. After testing, its 7d average compressive strength is 1.095MPa.

Comparative Example 1

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 80 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 5 g of raw gypsum, mix and stir evenly, and set aside. In addition, 400 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (400g) that is 24.4 percentage points higher than the moisture content of mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 6.05% (121 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold, and cured naturally at room temperature. After testing, its 7d average compressive strength is 0.643MPa.

Comparative Example 2

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 80 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 5 g of raw gypsum, mix and stir evenly, and set aside. In addition, 300 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (300g) that is 18.3 percentage points higher than the moisture content of mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 6.05% (121 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold, and cured naturally at room temperature. After testing, its 7d average compressive strength is 0.830MPa.

Comparative Example 3

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 80 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 5 g of raw gypsum, mix and stir evenly, and set aside. In addition, 250 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (250g) that is 15.3 percentage points higher than the moisture content of the mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 6.05% (121 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold, and cured at room temperature naturally. After testing, its 7d average compressive strength is 0.935MPa.

Comparative Example 4

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 70 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 7.5 g of raw gypsum, mix and stir evenly, and set aside. In addition, 400 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (400g) that is 24.4 percentage points higher than the moisture content of mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 5.675% (113.5 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold, and cured at room temperature naturally. After testing, its 7d average compressive strength is 0.470MPa.

Comparative Example 5

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 70 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 7.5 g of raw gypsum, mix and stir evenly, and set aside. In addition, 300 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (300g) that is 18.3 percentage points higher than the moisture content of mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 5.675% (113.5 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold, and cured at room temperature naturally. After testing, its 7d average compressive strength is 0.853MPa.

Comparative Example 6

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 70 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 7.5 g of raw gypsum, mix and stir evenly, and set aside. In addition, 250 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (250g) that is 15.3 percentage points higher than the moisture content of the mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 5.675% (113.5 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold, and cured at room temperature naturally. After testing, its 7d average compressive strength is 0.913MPa.

Comparative Example 7

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. Weigh 70 g of granulated blast furnace slag, 20 g of quicklime, 10 g of sodium carbonate, 6 g of sodium silicate, and 10 g of raw gypsum, mix and stir evenly, and set aside. In addition, 250 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (250g) that is 15.3 percentage points higher than the moisture content of the mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 5.80% (116 g) weight percent of the curing agent to the uniform slag described in step S2, and stirring at a speed of 120 r/min to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold, and cured at room temperature naturally. After testing, its 7d average compressive strength is 0.993MPa.

According to the results of Examples 1-3 and Comparative Examples 1-7 above, it can be seen that the optimum water content is the addition of water that is 5-15 percentage points higher than the moisture content of the slag. The curing 3d can reach more than 0.8MPa, which meets the backfill strength requirements. Too much water content can make the stirring more sufficient, but it hinders the hydration reaction, resulting in a decrease in the strength of the solidified slag sample; reducing the external water content can greatly improve the compressive strength of the sample; If the dosage is too small, the side effect of high viscosity of the slag will be prominent, making it difficult to mix the curing agent and the slag evenly, resulting in poor curing effect and failing to meet the basic strength requirements. At the same time, for the high-viscosity slag with high clay content, the dual effect of gypsum is obvious. When the amount of raw gypsum is within a certain range, the hydration reaction process consumes free water, and the hydration product fills the internal pores of the soil and cements the soil particles, thereby improving the strength of the solidified soil. When the content of raw gypsum continues to increase, the expansive hydration products generated by it will easily destroy the existing network structure of the solidified soil, resulting in a decrease in the strength of the solidified soil instead of increasing.

Further, the effect and economy of the solidification of the high-viscosity slag of the present invention as a backfill will be described in detail.

Comparative Example 8

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. With reference to the weight of the curing agent in Example 1, 121 g of PO42.5 cement was weighed for later use. In addition, 200 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (200g) that is 12.2 percentage points higher than the moisture content of the mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 6.05% (121 g) weight percent of PO42.5 cement to the homogeneous slag described in step S2, and stirring at a speed of 120 r/min to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold. After testing, the average compressive strength after natural curing at room temperature for 3d and 7d is 0.547MPa and 0.930MPa, respectively.

Comparative Example 9

Take 2000g of undisturbed mudstone slag and measure the initial moisture content of 22%. With reference to the cost of the curing agent in Example 1, the weight of PO42.5 cement converted into the same price is 166.3 g, and 166.3 g of PO42.5 cement is weighed for use. In addition, 200 g of water was weighed.

A method for solidifying high-viscosity slag as backfill, comprising the following steps:

S1. Weigh 2000g of high-viscosity slag, and test its moisture content to 22%;

S2, according to the moisture content obtained in step S1, add moisture (200g) that is 12.2 percentage points higher than the moisture content of the mudstone slag, and stir to a uniform state at a speed of 45r/min;

S3, adding 8.315% (166.3 g) by weight to the uniform slag described in step S2, and stirring at a speed of 120 r/min until it is uniform to obtain a solidified backfill.

The solidified backfill obtained in step S3 is poured into a 70.7*70.7*70.7mm cube triple mold. After testing, the average compressive strength after natural curing at room temperature for 3d and 7d is 0.710MPa and 0.992MPa, respectively.

It can be seen that the 3d compressive strength of Comparative Example 8 and Comparative Example 9 is less than 0.8MPa, and although the 7d strength can reach 0.8MPa, the curing effect and economy are better than those of Example 1, Example 2 and Example 3 of the present invention. worse.

To sum up, the present invention has the following advantages:

(1) No need to use with cement, and the curing effect is better than PO42.5 cement, natural curing 3d can reach more than 0.8MPa, basic backfill strength requirements, fast curing speed, which is conducive to shortening the construction period, and efficient and environmentally friendly.

(2) Make full use of the characteristics of high-viscosity slag being softened by water, and additionally add water to the slag to overcome the difficulty of mixing it evenly with the curing agent, so that it softens and expands after being soaked in water, forming a loose state, so as to fully contact the curing agent And stir evenly to improve the curing effect.

(3) The solidification cost of slag per cubic meter is within 85 yuan. Compared with the current mudstone slag disposal cost of 150 yuan per cubic meter and above at the construction site, the economic benefit is obvious.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

Claims (9)

1. a method for solidification of high-viscosity slag as backfill, is characterized in that, comprises the following steps: S1. Weigh the high-viscosity slag, and test its moisture content; S2, according to the moisture content obtained in step S1, add moisture that is 5-15 percentage points higher than the moisture content of the high-viscosity slag, and stir until it is uniform to form a slurry; S3, adding the curing agent within 6.1 wt% into the uniform slurry described in step S2, and stirring evenly to obtain a solidified backfill; Wherein, in the high-viscosity slag, the content of clay particles with a particle size of less than 5 μm is more than 30%, and the viscosity is greater than 5000 Pa·S; the curing agent is composed of the following components in parts by weight:

2. The method for solidifying high-viscosity slag for use as backfill according to claim 1, characterized in that, in the high-viscosity slag, the content of clay particles with a particle size of less than 5 μm is greater than or equal to 35%, and the particles with a particle size of less than or equal to 75 μm Content ≥ 85%. 3 . The method for solidifying high-viscosity slag as a backfill according to claim 1 or 2 , wherein in the step S1 , the moisture content of the high-viscosity slag is 18-35%. 4 . 4. The method for solidifying high-viscosity slag as a backfill according to claim 1, wherein in the step S3, the curing agent is added to the uniform slurry and stirred evenly, and is naturally cured at room temperature for 3d After curing, the compressive strength of the backfill is above 0.8MPa, which meets the requirements of the backfill. 5 . The method for solidifying high-viscosity slag as backfill according to claim 1 , wherein the mesh number of the granulated blast furnace slag is 200-400 mesh. 6 . 6 . The method for solidifying high-viscosity slag as a backfill according to claim 1 , wherein the quicklime contains more than 90% calcium, and the fineness is 200 mesh and the pass rate is more than 70%. 7 . 7 . The method for solidifying high-viscosity slag as a backfill according to claim 1 , wherein the sodium carbonate is solid powder, and the mesh number is 150-200 mesh. 8 . 8. The method for solidifying high-viscosity slag as a backfill according to claim 1, wherein the sodium silicate is a white solid powder, the modulus is 2.3-3.0, the fineness is 100 mesh, and the dissolution time 220s. 9 . The method for solidifying high-viscosity slag as a backfill according to claim 1 , wherein the raw gypsum has a mesh number of 300-400 mesh and a whiteness greater than 90%. 10 .

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