Anti-corrosion grouting material for high-sulfur ore body and preparation method of anti-corrosion grouting material

Abstract

The invention relates to the technical field of mine engineering materials, in particular to an anti-corrosion grouting material for a high-sulfur ore body and a preparation method of the anti-corrosion grouting material. The corrosion-resistant grouting material for the high-sulfur ore body is prepared from the following raw materials in parts by mass: 40 to 60 parts of Portland cement clinker, 10 to 20 parts of sulphoaluminate cement, 20 to 40 parts of water-quenched blast furnace slag micro powder, 3 to 5 parts of silica fume, 0 to 0.5 part of sodium gluconate, 0 to 0.5 part of lithium carbonate and 0.2 to 0.4 part of water reducing agent. The invention provides a grouting material suitable for reinforcing a high-sulfur ore body aiming at a sulfur-containing mineral geological environment. The grouting material has sulfide oxidation resistance and sulfate corrosion resistance, can effectively cope with existing sulfate, can effectively inhibit generation of new sulfate by sulfide oxidation, is controllable in setting time, has excellent mechanical properties, and solves the problems of poor durability and low construction adaptability of a high-sulfur ore body grouting material.

Description

Technical Field

[0001] The present invention relates to the technical field of mining engineering materials, in particular to an anti-corrosion grouting material for high-sulfur ore bodies and a preparation method thereof. Background Art

[0002] Traditional mining grouting materials are primarily based on ordinary Portland cement. However, in high-sulfur environments, sulfides easily react with hydration products to form sulfates. Sulfates affect the hydration process of ordinary Portland cement, causing the cement slurry to set slowly and generate expansive substances, leading to strength loss and cracking of the hardened material. Modified materials such as sulfoaluminate cement, while more corrosion-resistant, are expensive, have difficult-to-control setting times, and are less adaptable to complex sulfide environments.

[0003] Existing grouting materials have insufficient resistance to sulfur corrosion, the material maintains effective strength for a short time, and the contradiction between slurry fluidity and strength is prominent, making it difficult to balance construction performance and mechanical requirements; grouting materials cannot continuously inhibit the oxidation process of sulfides, and cannot prevent the grouting consolidation body from being damaged by secondary sulfate corrosion. Summary of the Invention

[0004] Based on the above content, the present invention provides an anti-corrosion grouting material for high-sulfur ore bodies and a preparation method thereof.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] One of the technical solutions of the present invention is an anti-corrosion grouting material for high-sulfur ore bodies, which comprises, by weight, the following raw materials:

[0007] 40-60 parts of Portland cement clinker, 10-20 parts of sulphoaluminate cement, 20-40 parts of water-quenched blast furnace slag powder, 3-5 parts of silica fume, 0-0.5 parts of sodium gluconate, 0-0.5 parts of lithium carbonate and 0.2-0.4 parts of water reducer.

[0008] A second technical solution of the present invention is a method for preparing the above-mentioned corrosion-resistant grouting material for high-sulfur ore bodies, comprising the following steps:

[0009] Mix the raw materials evenly according to their mass fractions and then ball-mill them until the specific surface area is not less than 400m 2 / kg, to obtain the corrosion-resistant grouting material for the high-sulfur ore body.

[0010] The third technical solution of the present invention is the application of the above-mentioned corrosion-resistant grouting material for high-sulfur ore bodies in the reinforcement of high-sulfur ore bodies.

[0011] The present invention discloses the following technical effects:

[0012] The present invention provides a grouting material suitable for reinforcing high-sulfur ore bodies in sulfur-bearing geological environments. This grouting material exhibits both resistance to sulfide oxidation and sulfate corrosion, effectively addressing existing sulfates while inhibiting the generation of new sulfates through sulfide oxidation. Furthermore, the material has a controllable setting time and excellent mechanical properties, addressing the issues of poor durability and low construction adaptability associated with grouting materials used in high-sulfur ore bodies. DETAILED DESCRIPTION

[0013] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0014] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. The intermediate value within any stated value or stated range, and each smaller range between any other stated value or intermediate value within the stated range, is also encompassed within the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0015] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0016] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the description of the invention. The description and examples are intended to be exemplary only.

[0017] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0018] The first aspect of the present invention provides an anti-corrosion grouting material for a high-sulfur ore body, wherein the raw materials include, by weight:

[0019] 40-60 parts of Portland cement clinker, 10-20 parts of sulphoaluminate cement, 20-40 parts of water-quenched blast furnace slag powder, 3-5 parts of silica fume, 0-0.5 parts of sodium gluconate, 0-0.5 parts of lithium carbonate and 0.2-0.4 parts of water reducer.

[0020] In the present invention, sodium gluconate acts as a retarder, lithium carbonate acts as an accelerator, and both sodium gluconate and sodium gluconate act to adjust the setting time. The water reducer acts to improve fluidity.

[0021] In a preferred embodiment of the present invention, the Portland cement clinker is specifically PO 42.5 ordinary Portland cement with a specific surface area of ≥300m 2 / kg.

[0022] In a preferred embodiment of the present invention, the sulphoaluminate cement is specifically R.SAC42.5 rapid hardening sulphoaluminate cement.

[0023] In a preferred embodiment of the present invention, the grade of the water-quenched blast furnace slag powder is S95.

[0024] In a preferred embodiment of the present invention, the water reducer is a polycarboxylate water reducer.

[0025] The corrosion-resistant grouting material for high-sulfur ore bodies of the present invention has the following advantages:

[0026] Corrosion resistance: Concrete specimens made of the anti-corrosion grouting material for high-sulfur ore bodies of the present invention and cured for 28 days have a compressive strength retention rate of >85% after 160 dry-wet cycles in a sulfate environment (concrete specimens prepared using P.O42.5 cement have a compressive strength retention rate of ≤60% after 160 dry-wet cycles in a sulfate environment); the test is carried out in accordance with the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-2024.

[0027] Mechanical properties: 3-day compressive strength>10MPa, 28-day>40MPa (according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-2024, compressive strength of 28-day specimens after 150 dry-wet cycles in a sulfur-salt environment);

[0028] Construction adaptability (water-cement ratio 0.3-0.4): initial fluidity>260mm;

[0029] Environmental protection: Industrial solid waste utilization rate ≥40% (such as slag powder and silica fume from metallurgical by-products).

[0030] A second aspect of the present invention provides a method for preparing the above-mentioned corrosion-resistant grouting material for high-sulfur ore bodies, comprising the following steps:

[0031] Mix the raw materials evenly according to their mass fractions and then ball-mill them until the specific surface area is not less than 400m 2 / kg, to obtain the corrosion-resistant grouting material for the high-sulfur ore body.

[0032] A third aspect of the present invention provides the use of the above-mentioned corrosion-resistant grouting material for high-sulfur ore bodies in the reinforcement of high-sulfur ore bodies.

[0033] In a preferred embodiment of the present invention, the high-sulfur ore body is reinforced by grouting after the corrosion-resistant grouting material and water are mixed into a slurry at a water-binder ratio of 0.3-0.4.

[0034] The use of the high-sulfur ore body corrosion-resistant grouting material of the present invention to reinforce the high-sulfur ore body has the following advantages:

[0035] (1) The corrosion-resistant grouting material used in high-sulfur ore bodies has the dual effects of "anti-sulfur and sulfur inhibition", namely, the sulfate resistance of sulfoaluminate cement and the reducing property of slag micropowder inhibit the oxidation of sulfide to produce new sulfate. The combination of these two effects can effectively deal with the problem of sulfur corrosion resistance of grouting materials.

[0036] (2) The silica fume in the anti-corrosion grouting material used in high-sulfur ore bodies can fill the micro-voids and form a dense anti-sulfur barrier.

[0037] (3) The combination of retarder (sodium gluconate) or accelerator (lithium carbonate) and water reducer can achieve the balance of "high fluidity-controllable coagulation".

[0038] The experimental method involved in the present invention is as follows:

[0039] The corrosion resistance (compressive strength retention rate after 150 dry-wet cycles of the specimen in a sulfur salt environment for 28 days) and mechanical properties were tested in accordance with the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-2024.

[0040] Test the construction adaptability (initial fluidity) in accordance with the "Test method for homogeneity of concrete admixtures" GB / T8077-2023.

[0041] Unless otherwise specified, the technical solutions described in the present invention are all conventional solutions in the field, and the reagents or raw materials used, unless otherwise specified, are purchased from commercial channels or have been disclosed.

[0042] The silicate cement clinker used in the embodiment of the present invention has a specific surface area of ≥300m 2 / kg of Portland cement clinker; the sulphoaluminate cement used is specifically R.SAC42.5 rapid-hardening sulphoaluminate cement; the grade of the water-quenched blast furnace slag powder used is S95; and the water reducer used is polycarboxylate water reducer.

[0043] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0044] Example 1

[0045] Step 1: The raw materials are composed of 50 parts by mass of Portland cement clinker, 10 parts by mass of sulphoaluminate cement, 36 parts by mass of water-quenched blast furnace slag powder, 4 parts by mass of silica fume, 0.2 parts by mass of sodium gluconate, and 0.2 parts by mass of polycarboxylate water reducer;

[0046] Step 2: Mix the above raw materials according to their mass fractions and then ball mill for 30 minutes. The specific surface area of the mixture obtained after ball milling is 468m 2 / kg (i.e., anti-corrosion grouting material for high-sulfur ore bodies);

[0047] Step 3: Mix the mixture and water at a water-binder ratio of 0.4 and stir them evenly at a stirring rate of 800 r / min to obtain grouting material.

[0048] The properties of the grouting material prepared in Example 1 are as follows: fluidity 280 mm, 3d strength 15.6 MPa, 28d sample strength 43.5 MPa after 150 dry-wet cycles in sulfur salt environment according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-202428-day specimen sulfur corrosion.

[0049] Example 2

[0050] Step 1: The raw materials are composed of 40 parts by mass of Portland cement clinker, 10 parts by mass of sulphoaluminate cement, 46 parts by mass of water-quenched blast furnace slag powder, 4 parts by mass of silica fume, 0.2 parts by mass of sodium gluconate, and 0.2 parts by mass of polycarboxylate water reducer;

[0051] Step 2: Mix the above raw materials according to their mass fractions and then ball mill for 30 minutes. The specific surface area of the mixture obtained after ball milling is 462m 2 / kg;

[0052] Step 3: Mix the mixture and water at a water-binder ratio of 0.4 and stir them evenly at a stirring rate of 800 r / min to obtain grouting material.

[0053] The properties of the grouting material prepared in Example 2 are as follows: fluidity 282 mm, 3d strength 12.6 MPa, 28d sample strength 40.2 MPa after 150 dry-wet cycles in sulfur salt environment according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-202428-day specimen sulfur corrosion.

[0054] Compared with Example 1, Example 2 reduces the amount of Portland cement clinker used, increases the amount of water-quenched blast furnace slag powder used, and reduces the cost by 10%.

[0055] Example 3

[0056] Step 1: The raw materials are composed of 50 parts by mass of Portland cement clinker, 10 parts by mass of sulphoaluminate cement, 36 parts by mass of water-quenched blast furnace slag powder, 4 parts by mass of silica fume, 0.5 parts by mass of lithium carbonate, and 0.2 parts by mass of polycarboxylate water reducer;

[0057] Step 2: Mix the above raw materials according to their mass fractions and then ball mill for 30 minutes. The specific surface area of the mixture obtained after ball milling is 454m 2 / kg;

[0058] Step 3: Mix the mixture and water at a water-binder ratio of 0.4 and stir them evenly at a stirring rate of 800 r / min to obtain grouting material.

[0059] The properties of the grouting material prepared in Example 3 are as follows: fluidity 276 mm, 3d strength 20.6 MPa, 28d sample strength 42.8 MPa after 150 dry-wet cycles in a sulfur salt environment according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-202428-day specimen sulfur corrosion.

[0060] Comparative Example 1

[0061] The only difference from Example 1 is that the water-quenched blast furnace slag powder is replaced by fly ash (grade I) of equal mass fraction.

[0062] The properties of the grouting material prepared in Comparative Example 1 are as follows: fluidity 290 mm, 3d strength 12.7 MPa, 28d sample strength 30.8 MPa after 150 dry-wet cycles in sulfur salt environment according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-202428-day specimen sulfur corrosion.

[0063] Comparative Example 2

[0064] The only difference from Example 1 is that the sulphoaluminate cement is replaced by fly ash (grade I) of equal mass.

[0065] The properties of the grouting material prepared in Comparative Example 2 are as follows: fluidity 284 mm, 3d strength 11.4 MPa, 28d sample strength 28.2 MPa after 150 dry-wet cycles in sulfur salt environment according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-202428-day specimen sulfur corrosion.

[0066] Comparative Example 3

[0067] The only difference from Example 1 is that the addition of silica fume is omitted, and the remaining steps and parameters are the same as those in Example 1.

[0068] The properties of the grouting material prepared in Comparative Example 3 are as follows: fluidity 291 mm, 3d strength 14.6 MPa, 28d sample strength 38.5 MPa after 150 dry-wet cycles in sulfur salt environment according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-202428-day specimen sulfur corrosion.

[0069] Comparative Example 4

[0070] The only difference from Example 1 is that the addition of sulphoaluminate cement is omitted, and the remaining steps and parameters are the same as those in Example 1.

[0071] The properties of the grouting material prepared in Comparative Example 4 are as follows: fluidity 286 mm, 3d strength 10.3 MPa, 28d sample strength 29.2 MPa after 150 dry-wet cycles in sulfur salt environment according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-202428-day specimen sulfur corrosion.

[0072] Comparative Example 5

[0073] The only difference from Example 1 is that the addition of water-quenched blast furnace slag powder is omitted, and the remaining steps and parameters are the same as those in Example 1.

[0074] The properties of the grouting material prepared in Comparative Example 5 are as follows: fluidity 275 mm, 3d strength 18.7 MPa, 28d sample strength 35.8 MPa after 150 dry-wet cycles in sulfur salt environment according to the "Standard for Test Methods for Long-term Performance and Durability of Concrete" GB / T50082-202428-day specimen sulfur corrosion.

[0075] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A corrosion-resistant grouting material for high-sulfur ore bodies, characterized in that: Calculated by mass, the raw materials include: 40-60 parts of Portland cement clinker, 10-20 parts of sulphoaluminate cement, 20-40 parts of water-quenched blast furnace slag powder, 3-5 parts of silica fume, 0-0.5 parts of sodium gluconate, 0-0.5 parts of lithium carbonate and 0.2-0.4 parts of water reducer.

2. The corrosion-resistant grouting material for high-sulfur ore body according to claim 1, characterized in that: The Portland cement clinker is specifically PO 42.5 ordinary Portland cement.

3. The corrosion-resistant grouting material for high-sulfur ore body according to claim 1, characterized in that: The sulphoaluminate cement is specifically R.SAC42.5 rapid hardening sulphoaluminate cement.

4. The corrosion-resistant grouting material for high-sulfur ore body according to claim 1, characterized in that: The grade of the water-quenched blast furnace slag powder is S95.

5. The corrosion-resistant grouting material for high-sulfur ore body according to claim 1, characterized in that: The water reducer is a polycarboxylate water reducer.

6. A method for preparing the corrosion-resistant grouting material for high-sulfur ore bodies according to any one of claims 1 to 5, characterized in that: The following steps are involved: Mix the raw materials evenly according to their mass fractions and grind them to a specific surface area of 400-500m 2 / kg, to obtain the corrosion-resistant grouting material for the high-sulfur ore body.

7. Use of the anti-corrosion grouting material for high-sulfur ore bodies according to any one of claims 1 to 5 in reinforcing high-sulfur ore bodies.

8. The use according to claim 7, characterized in that The high-sulfur ore body is reinforced by grouting after the corrosion-resistant grouting material and water are mixed into a slurry at a water-binder ratio of 0.3-0.4.