CN113149478B - Cementing material for modifying bulk filling body and preparation method and application thereof - Google Patents
Cementing material for modifying bulk filling body and preparation method and application thereof Download PDFInfo
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- CN113149478B CN113149478B CN202110622098.4A CN202110622098A CN113149478B CN 113149478 B CN113149478 B CN 113149478B CN 202110622098 A CN202110622098 A CN 202110622098A CN 113149478 B CN113149478 B CN 113149478B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
- C04B7/04—Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention relates to the technical field of filling mining, and particularly discloses a cementing material for modifying a bulk filling body, and a preparation method and application thereof. The cementing material for modifying the bulk filler comprises the following components in percentage by mass: 5-20% of cement clinker, 70-90% of slag powder and 3-10% of desulfurized gypsum powder; the slag powder comprises 34-38% of calcium oxide, 7-12% of magnesium oxide, 29-34% of silicon dioxide, 15-17% of aluminum oxide and 1-5% of ferric oxide by mass percent; the mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 90-99%. The cementing material for modifying the bulk filler provided by the invention has the advantages of simple component composition, low cost, less water demand and easiness in preparation, has good cohesiveness and high early strength when being used as a raw material of the filling material, and realizes the resource utilization of solid wastes.
Description
Technical Field
The invention relates to the technical field of filling mining, in particular to a cementing material for modifying a bulk filling body and a preparation method and application thereof.
Background
Coal is used as a main energy source of China, plays a vital role in the national economic development process and accounts for about 60 percent of primary energy of China. However, a series of problems of mine area ground surface collapse, water resource loss, gangue discharge and the like caused in the coal mining process bring great influence on the ecological environment of the mine area, and stope roof collapse caused by all collapse methods directly threatens the safety production of mines.
The filling coal mining technology is an important means for green mine construction, can effectively solve the problem of dissonance between the development of mine enterprises and the ecological environment of a mining area, and is an excellent method for solving the problem of coal pressing resource waste under 'three places' (under buildings, railways and water). The filling coal mining method has the advantages of high coal resource extraction rate, small surface subsidence deformation, reduction of adverse effects of surface solid wastes on the environment and the like, but the actual application effect and reliability of the filling coal mining method are influenced by various factors. According to incomplete statistics, the filling cost in the filling mining process accounts for about 30% of the mining cost, and the expensive filling cost brings great economic burden to coal mine enterprises, and seriously restricts the application and development of filling coal mining technology.
The solid filling coal mining technology is a green coal mining technology which directly utilizes solid waste materials such as coal gangue and the like to replace coal resources, and compared with paste filling and high water filling, the technology has the characteristics of large filling amount, high efficiency and low cost. However, the conventional solid filling body composed of coal gangue has poor integral performance, and the compactness of the filling body cannot be guaranteed. At present, the optimization of the underground solid filling material is carried out by researching the grain composition and the cementation characteristics of coal gangue and fly ash, but the obtained material still has the defects of poor cementation, long setting time, low strength and the like, and after the solid material is filled into a goaf, the solid material can generate compression deformation of different degrees under the action of overlying strata pressure of a stope. The cementing property of the filling material is increased by adding a proper amount of loess or cement as a cementing material, so that the integrity of the filling body is improved, but the defect of long setting time of the filling body cannot be overcome, the filling coal mining efficiency is greatly reduced, and the cost for preparing the filling material is further increased due to the large use of cement and other cementing materials. Therefore, the preparation of filling materials with good service performance, low cost and high efficiency becomes the key point of the development of filling coal mining technology.
Disclosure of Invention
Aiming at the problems of the existing filling material, the invention provides the cementing material for modifying the bulk filling body and the preparation method and the application thereof.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a cementing material for modifying a bulk filler comprises the following components in percentage by mass: 5-20% of cement clinker, 70-90% of slag powder and 3-10% of desulfurized gypsum powder;
the slag powder comprises 34-38% of calcium oxide, 7-12% of magnesium oxide, 29-34% of silicon dioxide, 15-17% of aluminum oxide and 1-5% of ferric oxide by mass percentage;
the mass content of the dihydrate calcium sulfate in the desulfurized gypsum powder is 90-99%.
The cementing material for modifying the bulk filler provided by the invention selects cement clinker, slag powder and desulfurized gypsum powder as raw materials, and limits the proportion of the three raw materials, the slag powder and the components of the desulfurized gypsum powder. The desulfurized gypsum belongs to industrial byproducts, is low in cost, has extremely high calcium sulfate content, and is beneficial to improving the reaction activity of the slag powder. The combination of the desulfurized gypsum powder and the slag powder in a specific proportion is a key core factor influencing the strength, the setting speed and the micro-expansion of the filling body, and the combination of the desulfurized gypsum powder and the slag powder can regulate the hydration process, obviously reduce the water consumption of the filling body and quickly combine with the activity A1 in the cement clinker 2 O 3 The reaction forms ettringite, improves the expansibility, promotes the rapid cementing and forming of the filling body and the formation of early strength. Meanwhile, the slag powder can obviously improve the comprehensive performance of the modified cementing material, improve the integral strength and durability of a solid filling body and improve the workability of the filling body. Increasing the proportion of the slag powder can not only improve the mechanical properties of the solid filler but also greatly reduce the manufacturing cost of the cementing material, but if the addition amount of the slag powder is too large, a large amount of other admixtures need to be added into the cementing material to improve the early strength of the cementing material. The proportion of the raw materials, the slag powder and the components of the desulfurized gypsum powder are researched and limited, and the raw materials are finally determinedUnder the conditions of proportioning and component composition, the excellent early strength performance of the cementing material can be realized without adding any additional admixture. The addition of the small amount of cement clinker can also ensure that more hydrated calcium silicate gel is quickly generated in the cementing material for modifying the bulk filler, and simultaneously, microcracks do not occur to influence the overall service strength of the cementing material system.
The raw material proportion of the cementing material for modifying the bulk filling body provided by the invention is simple and easy to obtain, the cost is low, the resource utilization of a large amount of solid wastes is realized, and the excellent performances of good cohesiveness and high early strength are still achieved under the condition of not adding any other admixtures. In addition, the modified cementing material provided by the invention can also ensure that no caking phenomenon occurs within 1h under a bulk state without external force action, can be molded by self-stabilization within 30min after being compacted in a mold, is very suitable for belt transportation of underground solid filling materials and goaf filling, effectively improves the filling efficiency, reduces the coal mine filling and mining period and controls surface subsidence.
Preferably, the cementing material for modifying the bulk filler comprises the following components in percentage by mass: 10-15% of cement clinker, 80-85% of slag powder and 4-6% of desulfurized gypsum powder. The raw material composition of the mass ratio can further improve the caking property and the early strength of the modified cementing material.
Preferably, the cement clinker comprises, by mass, 60% -65% of calcium oxide, 3% -5% of magnesium oxide, 20% -25% of silicon dioxide, 3% -6% of aluminum oxide and 3% -5% of ferric oxide.
Preferably, the slag powder is slag powder obtained by quenching, drying, crushing and grinding granulated blast furnace slag, and the particle size of the slag powder is 40-50 mu m. The slag powder with the grain size can further improve the early strength of the filling body prepared from the cementing material.
The invention also provides a preparation method of the cementing material for modifying the bulk filler. The preparation method comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the modified cementing material.
A filling material comprises the modified cementing material, coal gangue and water.
The filling material provided by the invention combines the cementing material for modifying the bulk filling body with the coal gangue, can achieve the service performance basically equivalent to or even better than that of the filling material consisting of the traditional cement and coal, but has the cost far lower than that of the filling material consisting of the traditional cement and coal.
Preferably, the mass ratio of the cementing material used for modifying the bulk filling body, the coal gangue and the water is 1:3-12: 0.4-0.8.
Preferably, the mass ratio of the cementing material used for modifying the bulk filler, the coal gangue and the water is 1:8-12: 0.4-0.6.
Preferably, the coal gangue has a particle size of less than or equal to 40mm, wherein the mass ratio of the coal gangue with the particle size of less than 10mm, between 11 and 20mm and between 21 and 40mm is 2.5-3.5:5-7: 1. The particle size of the coal gangue is controlled under the specific gradation and proportion, so that the workability of the filling material can be further ensured.
Preferably, the mass ratio of the coal gangue with the grain diameter of less than 10mm, between 11 and 20mm and between 21 and 40mm is 3:6: 1.
The invention also provides a preparation method of the filling material, which comprises the following steps: and uniformly mixing the cementing material for modifying the bulk filling body, the coal gangue and the water according to the mass ratio to obtain the filling material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
A cementing material for modifying a bulk filler comprises the following components in percentage by mass: 5% of cement clinker, 85% of slag powder and 10% of desulfurized gypsum powder.
The slag powder comprises 34% of calcium oxide, 12% of magnesium oxide, 34% of silicon dioxide, 17% of aluminum oxide and 3% of ferric oxide by mass percent; the slag powder is obtained by quenching, drying, crushing and grinding granulated blast furnace slag, and has a particle size of 40-50 μm.
The mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 90 percent;
the cement clinker comprises 60% of calcium oxide, 5% of magnesium oxide, 25% of silicon dioxide, 6% of aluminum oxide and 4% of ferric oxide by mass percent.
The preparation method of the cementing material for modifying the bulk filler comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the cement clinker.
The coal gangue filling material is prepared from the cementing material, coal gangue and water according to the mass ratio of 1:8:0.4, wherein the particle size of the coal gangue is less than or equal to 40mm, and the mass ratio of the coal gangue with the particle size of less than 10mm, 11-20mm and 21-40mm is 2.5:5: 1.
The preparation method of the filling material comprises the following steps: and uniformly mixing the cementing material, the coal gangue and water according to the mass ratio to obtain the filling material.
Detecting the service performance of the filling material: pouring the filling material by using a 150mm multiplied by 150mm cubic die, stabilizing the pressure for 10s under the pressure of 10kN, demoulding the obtained filling body for 15min, curing the filling body under the conditions of 20 ℃ of temperature and 92% of humidity after demoulding, and detecting the compressive strength of the filling body for 3 days and 28 days after curing.
Example 2
The cementing material for modifying the bulk filler comprises the following components in percentage by mass: 20% of cement clinker, 77% of slag powder and 3% of desulfurized gypsum powder.
The slag powder comprises 38% of calcium oxide, 10% of magnesium oxide, 31% of silicon dioxide, 16% of aluminum oxide and 5% of ferric oxide by mass percent; the slag powder is obtained by quenching, drying, crushing and grinding granulated blast furnace slag, and has a particle size of 40-50 μm.
The mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 95 percent;
the cement clinker comprises 65% of calcium oxide, 3% of magnesium oxide, 23% of silicon dioxide, 6% of aluminum oxide and 3% of ferric oxide by mass percent.
The preparation method of the cementing material for modifying the bulk filler comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the cement clinker.
The coal gangue filling material is prepared from the cementing material, coal gangue and water according to the mass ratio of 1:12:0.6, wherein the particle size of the coal gangue is less than or equal to 40mm, and the mass ratio of the coal gangue to the particle size of 10mm or less, 11-20mm and 21-40mm is 3.5:7: 1.
The preparation method of the filling material comprises the following steps: and uniformly mixing the cementing material, the coal gangue and water according to the mass ratio to obtain the filling material.
Detecting the service performance of the filling material: pouring the filling material by using a 150mm multiplied by 150mm cubic die, stabilizing the pressure for 10s under the pressure of 10kN, demoulding the obtained filling body for 15min, curing the filling body under the conditions of 20 ℃ of temperature and 92% of humidity after demoulding, and detecting the compressive strength of the filling body for 3 days and 28 days after curing.
Example 3
A cementing material for modifying a bulk filler comprises the following components in percentage by mass: 10% of cement clinker, 84% of slag powder and 6% of desulfurized gypsum powder.
The slag powder comprises, by mass, 37% of calcium oxide, 11% of magnesium oxide, 32% of silicon dioxide, 15% of aluminum oxide and 5% of ferric oxide; the slag powder is obtained by quenching, drying, crushing and grinding granulated blast furnace slag, and has a particle size of 40-50 μm.
The mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 99 percent;
the cement clinker comprises 63% of calcium oxide, 4% of magnesium oxide, 24% of silicon dioxide, 5% of aluminum oxide and 4% of ferric oxide by mass percent.
The preparation method of the cementing material for modifying the bulk filler comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the cement clinker.
The coal gangue filling material is prepared from the cementing material, coal gangue and water according to the mass ratio of 1:10:0.5, wherein the particle size of the coal gangue is less than or equal to 40mm, and the mass ratio of the coal gangue with the particle size of less than 10mm, 11-20mm and 21-40mm is 3:6: 1.
The preparation method of the filling material comprises the following steps: and uniformly mixing the cementing material, the coal gangue and water according to the mass ratio to obtain the filling material.
Detecting the service performance of the filling material: pouring the filling material by using a 150mm multiplied by 150mm cubic die, stabilizing the pressure for 10s under the pressure of 10kN, demoulding the obtained filling body for 15min, curing the filling body under the conditions of 20 ℃ of temperature and 92% of humidity after demoulding, and detecting the compressive strength of the filling body for 3 days and 28 days after curing.
Example 4
The cementing material for modifying the bulk filler comprises the following components in percentage by mass: 12% of cement clinker, 83% of slag powder and 5% of desulfurized gypsum powder.
The slag powder comprises, by mass, 37% of calcium oxide, 11% of magnesium oxide, 32% of silicon dioxide, 15% of aluminum oxide and 5% of ferric oxide; the slag powder is obtained by quenching, drying, crushing and grinding granulated blast furnace slag, and has a particle size of 40-50 μm.
The mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 99 percent;
the cement clinker comprises 63% of calcium oxide, 4% of magnesium oxide, 24% of silicon dioxide, 5% of aluminum oxide and 4% of ferric oxide by mass percent.
The preparation method of the cementing material for modifying the bulk filler comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the cement clinker.
The coal gangue filling material is prepared from the cementing material, coal gangue and water according to the mass ratio of 1:10:0.5, wherein the particle size of the coal gangue is less than or equal to 40mm, and the mass ratio of the coal gangue with the particle size of less than 10mm, 11-20mm and 21-40mm is 3:6: 1.
The preparation method of the filling material comprises the following steps: and uniformly mixing the cementing material, the coal gangue and water according to the mass ratio to obtain the filling material.
Detecting the service performance of the filling material: pouring the filling material by using a 150mm multiplied by 150mm cubic body mould, stabilizing the pressure for 10s under the pressure of 10kN, demoulding the obtained filling body for 15min, curing the filling body under the conditions of 20 ℃ of temperature and 92% of humidity after demoulding, and detecting the compressive strength of the filling body for 3 days and 28 days of curing.
Example 5
A cementing material for modifying a bulk filler comprises the following components in percentage by mass: 10% of cement clinker, 84% of slag powder and 6% of desulfurized gypsum powder.
The slag powder comprises, by mass, 37% of calcium oxide, 11% of magnesium oxide, 32% of silicon dioxide, 15% of aluminum oxide and 5% of ferric oxide; the slag powder is obtained by quenching, drying, crushing and grinding granulated blast furnace slag, and has a particle size of 40-50 μm.
The mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 95 percent;
the cement clinker comprises 63% of calcium oxide, 4% of magnesium oxide, 24% of silicon dioxide, 5% of aluminum oxide and 4% of ferric oxide by mass percent.
The preparation method of the cementing material for modifying the bulk filling body comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the cement clinker.
The coal gangue filling material is prepared from the cementing material, coal gangue and water according to the mass ratio of 1:10:0.5, wherein the particle size of the coal gangue is less than or equal to 40mm, and the mass ratio of the coal gangue to the particle size of 10mm or less, 11-20mm and 21-40mm is 3:6: 1.
The preparation method of the filling material comprises the following steps: and uniformly mixing the cementing material, the coal gangue and water according to the mass ratio to obtain the filling material.
And (3) detecting the service performance of the filling material: pouring the filling material by using a 150mm multiplied by 150mm cubic die, stabilizing the pressure for 10s under the pressure of 10kN, demoulding the obtained filling body for 15min, curing the filling body under the conditions of 20 ℃ of temperature and 92% of humidity after demoulding, and detecting the compressive strength of the filling body for 3 days and 28 days after curing.
Example 6
The cementing material for modifying the bulk filler comprises the following components in percentage by mass: 15% of cement clinker, 81% of slag powder and 4% of desulfurized gypsum powder.
The slag powder comprises, by mass, 37% of calcium oxide, 11% of magnesium oxide, 32% of silicon dioxide, 15% of aluminum oxide and 5% of ferric oxide; the slag powder is obtained by quenching, drying, crushing and grinding granulated blast furnace slag, and has a particle size of 40-50 μm.
The mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 99 percent;
the cement clinker comprises 63% of calcium oxide, 4% of magnesium oxide, 24% of silicon dioxide, 5% of aluminum oxide and 4% of ferric oxide by mass percent.
The preparation method of the cementing material for modifying the bulk filler comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the cement clinker.
The coal gangue filling material is prepared from the cementing material, coal gangue and water according to the mass ratio of 1:10:0.5, wherein the particle size of the coal gangue is less than or equal to 40mm, and the mass ratio of the coal gangue with the particle size of less than 10mm, 11-20mm and 21-40mm is 3:6: 1.
The preparation method of the filling material comprises the following steps: and uniformly mixing the cementing material, the coal gangue and water according to the mass ratio to obtain the filling material.
Detecting the service performance of the filling material: pouring the filling material by using a 150mm multiplied by 150mm cubic die, stabilizing the pressure for 10s under the pressure of 10kN, demoulding the obtained filling body for 15min, curing the filling body under the conditions of 20 ℃ of temperature and 92% of humidity after demoulding, and detecting the compressive strength of the filling body for 3 days and 28 days after curing.
Example 7
A cementing material for modifying a bulk filler comprises the following components in percentage by mass: 15% of cement clinker, 80% of slag powder and 5% of desulfurized gypsum powder.
The slag powder comprises 37% of calcium oxide, 11% of magnesium oxide, 32% of silicon dioxide, 15% of aluminum oxide and 5% of ferric oxide by mass percentage; the slag powder is obtained by quenching, drying, crushing and grinding granulated blast furnace slag, and has a particle size of 40-50 μm.
The mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 99 percent;
the cement clinker comprises 63% of calcium oxide, 4% of magnesium oxide, 24% of silicon dioxide, 5% of aluminum oxide and 4% of ferric oxide by mass percent.
The preparation method of the cementing material for modifying the bulk filler comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the cement clinker.
The coal gangue filling material is prepared from the cementing material, coal gangue and water according to the mass ratio of 1:3:0.8, wherein the particle size of the coal gangue is less than or equal to 40mm, and the mass ratio of the coal gangue to the particle size of 10mm or less, 11-20mm and 21-40mm is 3:6: 1.
The preparation method of the filling material comprises the following steps: and uniformly mixing the cementing material, the coal gangue and water according to the mass ratio to obtain the filling material.
Detecting the service performance of the filling material: pouring the filling material by using a 150mm multiplied by 150mm cubic die, stabilizing the pressure for 10s under the pressure of 10kN, demoulding the obtained filling body for 15min, curing the filling body under the conditions of 20 ℃ of temperature and 92% of humidity after demoulding, and detecting the compressive strength of the filling body for 3 days and 28 days after curing.
Comparative example 1
The PO42.5 cement was used in place of the cement in example 7, and the other materials, preparation method and demold curing conditions were the same as in example 1 to obtain a filling body, and the compressive strength of the filling body was measured for 3 days and 28 days of curing.
Comparative example 2
Coal was used in place of the coal gangue in example 7, and the other materials, preparation method and demold curing conditions were the same as in example 1 to obtain a filler, and the compressive strengths of the filler cured for 3 days and 28 days were measured.
Comparative example 3
The cement PO42.5 was used in place of the cementitious material in example 7, the coal gangue in example 7 was used in place of the coal gangue, and the other materials, preparation methods, and demold curing conditions were the same as in example 1, to obtain a filler, and the compressive strengths of the filler cured for 3 days and 28 days were measured.
The demold times and compressive strengths at various curing days of the compacts obtained in examples 1 to 6 and comparative examples 1 to 3 are shown in Table 1.
TABLE 1
As can be seen from Table 1, compared with the filling material made of ordinary cement, under the condition that the mass ratio of water, rubber and coal is the same, the coal gangue filling material made of the cementing material obtained by the invention has higher early compressive strength than the filling material made of ordinary cement, and the cost is far lower than that of the conventional filling material made of cement.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A filling material, characterized by: the material consists of a cementing material for modifying a bulk filling body, coal gangue and water;
the cementing material for modifying the bulk filler comprises the following components in percentage by mass: 5-20% of cement clinker, 70-90% of slag powder and 3-10% of desulfurized gypsum powder;
the slag powder comprises 34-38% of calcium oxide, 7-12% of magnesium oxide, 29-34% of silicon dioxide, 15-17% of aluminum oxide and 1-5% of ferric oxide by mass percent;
the mass content of the calcium sulfate dihydrate in the desulfurized gypsum powder is 90-99 percent;
the cement clinker comprises, by mass, 60-65% of calcium oxide, 3-5% of magnesium oxide, 20-25% of silicon dioxide, 3-6% of aluminum oxide and 3-5% of ferric oxide;
the slag powder is slag powder formed by quenching, drying, crushing and grinding granulated blast furnace slag, and the particle size of the slag powder is 40-50 mu m;
the mass ratio of the cementing material used for modifying the bulk filling body, the coal gangue and the water is 1:8-12: 0.4-0.6;
the grain diameter of the coal gangue is less than or equal to 40mm, wherein the mass ratio of the coal gangue with the grain diameter of less than 10mm, between 11 and 20mm and between 21 and 40mm is 2.5-3.5:5-7: 1.
2. The filling material according to claim 1, wherein: the cementing material for modifying the bulk filler comprises the following components in percentage by mass: 10 to 15 percent of cement clinker, 80 to 85 percent of slag powder and 4 to 6 percent of desulfurized gypsum powder.
3. The filling material according to claim 1 or 2, wherein: the preparation method of the cementing material for modifying the bulk filler comprises the following steps: and uniformly mixing the cement clinker, the slag powder and the desulfurized gypsum powder according to the mass percentage to obtain the modified cementing material.
4. The filling material according to claim 1, wherein: the mass ratio of the coal gangue with the grain diameter of less than 10mm, between 11 and 20mm and between 21 and 40mm is 3:6: 1.
5. The method for producing a filling material according to any one of claims 1 to 4, wherein: and uniformly mixing the cementing material for modifying the bulk filling body, the coal gangue and the water according to the mass ratio to obtain the filling material.
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| CA1258269A (en) * | 1986-08-29 | 1989-08-08 | Standard Slag Cement A Standard Industries Company A Division Of Canada Cement Lafarge Ltd. | Cementitious binder for consolidated fill |
| CN1238292C (en) * | 2003-01-10 | 2006-01-25 | 中国矿业大学（北京校区） | Cementing materials for filling, slurry and preparing and filling processes |
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2021
- 2021-01-25 CN CN202110098819.6A patent/CN112723762A/en not_active Withdrawn
- 2021-06-03 CN CN202110622098.4A patent/CN113149478B/en active Active
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| 山东某金矿细粒尾矿胶结性能试验;宋艳民;《现代矿业》;20200229(第2期);第92-95页 * |
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| CN113149478A (en) | 2021-07-23 |
| CN112723762A (en) | 2021-04-30 |
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