CN115385589A - Cementing material for coal gangue cemented filling and production and use methods thereof - Google Patents

Cementing material for coal gangue cemented filling and production and use methods thereof Download PDF

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Publication number
CN115385589A
CN115385589A CN202211084333.8A CN202211084333A CN115385589A CN 115385589 A CN115385589 A CN 115385589A CN 202211084333 A CN202211084333 A CN 202211084333A CN 115385589 A CN115385589 A CN 115385589A
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slag
powder
steel slag
filling
micro powder
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巴蕾
王晶
卓庆奉
岑旺
马文
肖柏林
王奇峰
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Ordos vocational college
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Ordos vocational college
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/14Cements containing slag
    • C04B7/147Metallurgical slag
    • C04B7/153Mixtures thereof with other inorganic cementitious materials or other activators
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/08Slag cements
    • C04B28/082Steelmaking slags; Converter slags
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/36Manufacture of hydraulic cements in general
    • C04B7/38Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00Methods or devices for placing filling-up materials in underground workings
    • E21F15/005Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00724Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention relates to the technical field of coal mine filling mining, in particular to a cementing material for coal gangue cemented filling and a production and use method thereof, wherein the cementing material is prepared from three industrial solid wastes of S95 slag micro powder, converter steel slag micro powder and power plant desulfurization gypsum according to the following weight proportion: 30-35% of steel slag micro powder, 15-20% of power plant desulfurized gypsum and 45-55% of slag micro powder. The invention takes S95 slag micro powder and converter steel slag micro powder as active materials, the steel slag micro powder is also taken as an alkali excitant material, a small part of power plant desulfurization gypsum is doped as a salt excitant, no cement or clinker is added, and all raw materials are industrial solid wastes; the utilization rate of the low-quality solid waste of the steel slag and the desulfurized gypsum reaches more than 50 percent, and compared with the slag of a slag-based filling cementing material, the slag consumption is reduced by half.

Description

Cementing material for coal gangue cemented filling and production and use methods thereof
Technical Field
The invention relates to the technical field of coal mine filling mining, in particular to a cementing material for coal gangue cemented filling and a production and use method thereof.
Background
The filling method has complex mining process, low production capacity and high mining cost, and is generally used for mining precious metals and nonferrous metals. Along with the stricter environmental protection for resource development and the safety and technical requirements for 'three-next-up' coal mining in China, the coal mining by the cement filling method is an important method for coal mining in China, and more coal mines are mined by the filling method in recent years.
One limitation of the cemented filling method is difficult to realize, namely high cost, which is intensively reflected on the cementing material. In recent years, low-cost filling cementing materials and preparation methods thereof are continuously researched and developed. Chinese patent Nos. CN1291631A, CN1273222A and CN102887693A disclose mining cementing material and full-sandy-soil consolidation filling material, production and preparation methods. The cementing material is prepared by taking slag as a main material and taking quicklime, gypsum and an additive as a composite exciting agent. CN103145354A discloses a clinker-free composite tailing consolidating agent and a preparation method thereof, wherein the cementing material is mainly prepared from slag by compounding and exciting cement clinker, quicklime and an additive. CN201811526296 discloses a cementing material for early-strength mine filling and a preparation method thereof. The cementing material is prepared by mixing steel slag and slag as a mixture, gypsum, cement clinker and a water reducing agent. Although the steel slag micro powder is added into the cementing material, the cementing material is prepared by adopting cement clinker and an additive, and the mixing amount of the steel slag micro powder is less than 30 percent.
In conclusion, the solid wastes disclosed in the above patent are characterized in that: (1) slag is used as a main material or a small amount of steel slag micro powder is added; (2) the exciting agent is prepared from artificial materials such as cement clinker, quicklime, an additive and the like. (3) Respectively grinding a plurality of solid waste materials; then mixing different powders by adopting a mixing system; and finally, conveying the mixed powder product to a filling station and pumping the powder product into a cement bin for use. The main problems of the filled cementitious material prepared as well as the production and use methods are as follows: (1) the addition of the slag is mostly as high as more than 70%, the use cost of the slag micro powder is rapidly increased in recent years, the supply and demand in some areas are short, and the cost of the slag-based cementing material is basically close to that of cement; (2) the low-quality solid waste utilization rate of the steel slag and the desulfurized gypsum is low, and the cost of the cementing material is high; (3) the production process of the cementing material is complex, investment and purchase equipment and construction of a mixing workshop for various powder materials are required, and the mixing equipment and the investment and land acquisition cost are required. (4) Solid waste material powder with different physicochemical characteristics is easy to react after being mixed, so that the mixed product is easy to harden, and the quality guarantee period of the cementing material is short.
Disclosure of Invention
In order to solve the problems, the invention provides a cementing material for coal gangue cemented filling and a production and use method thereof, wherein S95 slag micro powder and converter steel slag micro powder are used as active materials, the steel slag micro powder is also used as an alkaline activator material, a small part of power plant desulfurization gypsum is doped as a salt activator, no cement or clinker is added, and all raw materials are industrial solid wastes.
In order to achieve the purpose, the invention adopts the technical scheme that:
the cementing material for coal gangue cemented filling is prepared from three industrial solid wastes, namely S95 slag micro powder, converter steel slag micro powder and power plant desulfurization gypsum, according to the following weight proportion: 30-35% of steel slag micro powder, 15-20% of power plant desulfurized gypsum and 45-55% of slag micro powder, wherein the alkalinity coefficient of the converter steel slagM=CaO/[SiO 2 +P 2 O 5 ]Not less than 1.8; the powder plus 45 mu m sieve residue is less than or equal to 10 percent or the Boehringer specific surface area is more than or equal to 430m 2 Per kg; the content of free calcium oxide is less than or equal to 8 percent; SO in chemical components of power plant desulfurization gypsum 3 The content is more than or equal to 38 percent; the slag micro powder meets the requirement of S95 powder in GB/T18046-2017.
The invention also provides a production method of the cementing material for coal gangue cemented filling, which comprises the following steps:
s1, grinding and deironing the steel slag by adopting a large roller mill and a small ball mill in combination with an electromagnetic screen column, and pumping the ground finished product into a finished product bin 1 for storage;
s2, homogenizing the desulfurized gypsum and the slag by adopting a Raymond mill according to the mass ratio of 1.
Furthermore, the steel slag treated by the large roller press needs to be treated by an electromagnetic screen column for 2-3 times and then enters a small ball mill. The electromagnetic screen column comprises a cylindrical visible shell, at least one layer of electromagnetic screen arranged in the visible shell through bolts, and a vibrating motor arranged on the outer wall of the visible shell.
The invention also provides a using method of the cementing material for coal gangue cemented filling, which comprises the following steps:
s1, respectively transporting steel slag micro powder, slag and desulfurized gypsum mixed powder to a mine filling station by using a cement powder transport tank car, and respectively driving the steel slag micro powder, the slag and the desulfurized gypsum mixed powder into a steel slag powder bin and a mixed powder bin of the filling station;
s2, when the mine is filled and pulped, discharging the steel slag powder and the mixed powder according to the mass ratio of 1.85-1 to 2.3 by using a metering system of a filling station, adding a proper amount of water and coal gangue aggregate according to the mine filling proportion, stirring, pumping into a high-temperature high-pressure homogenizer, and homogenizing at 200 ℃ and 200Mpa for 30-40min to obtain filling slurry.
The invention has the following beneficial effects:
(1) s95 slag micro powder and converter steel slag micro powder are used as active materials, the steel slag micro powder is also used as an alkaline activator material, a small part of power plant desulfurization gypsum is doped to be used as a salt activator, no cement or clinker is added, and all raw materials are industrial solid wastes;
(2) the utilization rate of low-quality solid waste of the steel slag and the desulfurized gypsum reaches more than 50 percent, and compared with the slag of a slag-based filling cementing material, the usage amount of the slag is reduced by half;
(3) during production, calcination is not needed, only grinding is needed, the steel slag grinding adopts a large roller mill and a small ball mill and an electromagnetic screen column, the power consumption is lower compared with the traditional combined grinding system, and meanwhile, the iron powder in the steel slag can be quickly removed; the slag and the desulfurized gypsum can be ground together by a vertical mill, or can be homogenized by a small Raymond mill according to the mass ratio of 1;
(4) in industrial use, the powder materials in the two bins are fed according to the mass ratio of 1.85-1; the high-pressure high-temperature treatment mode can improve the mixing uniformity of the raw materials in the filling slurry on one hand, and on the other hand, the raw materials can spontaneously grow and crystallize, and the morphology is regular and uniform in dispersion, so that the cementing property of the filling slurry can be improved;
(5) the filling body prepared from the cementing material has a good cementing effect and high later strength, is beneficial to reducing the cost of coal mine filling and mining, reducing carbon emission and improving the stability of a stope, and therefore, the economic benefit and the environmental protection benefit of a coal mine enterprise are obviously improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a particle size distribution curve of steel slag micropowder from Fujian iron and steel company;
FIG. 2 is a particle size distribution curve of slag micropowder of Fujian iron and steel company;
FIG. 3 is a particle size distribution curve of steel slag micropowder of a certain Steel company in Xinjiang;
FIG. 4 is an X-ray diffraction curve of steel slag micropowder of a certain Steel company in Xinjiang;
FIG. 5 is a particle size distribution curve of slag micropowder of a certain iron and steel company in Hebei;
FIG. 6 is an X-ray diffraction pattern of slag powder from a certain iron and steel company in Hebei;
FIG. 7 is an X-ray diffraction curve of desulfurized gypsum from a power plant in Xinjiang.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
1. Cementing material for coal mine filling
The cementing material for the coal mine cemented filling is mixed according to the following weight percentage: 30-35% of steel slag micro powder, 15-20% of power plant desulfurized gypsum and 45-55% of slag micro powder. The related steel slag micro powder is converter steel slag, the alkalinity coefficient is more than or equal to 1.8, the free calcium oxide is less than or equal to 8 percent, and the powder plus 45 mu m sieve residue is less than or equal to 10 percent; the slag micro powder is S95 powder specified in GB/T18046-2017; SO in chemical synthesis of desulfurized gypsum 3 ≥38%。
2. Production process of coal mine filling cementing material
(1) Grinding and iron removal treatment of the steel slag are realized by adopting a large roller press matched with a small ball mill and an electromagnetic screen column, crushing is realized by adopting a roller press, grinding is realized by using a ball mill, iron is removed by screening of the electromagnetic screen column, and the production process of crushing, iron removal, grinding and powder selection of the steel slag which is difficult to grind is implemented; then pumping the steel slag micro powder meeting the requirements into a finished product bin for storage;
(2) Treating the wet desulphurization gypsum by a drying method to remove free water, so that the water content of the desulphurization gypsum meets the requirements of a vertical mill system;
(3) Carrying out system transformation on a slag vertical mill, installing a desulfurized gypsum charging hopper and a metering system on one side of a slag feeding and conveying belt, simultaneously conveying desulfurized gypsum and slag to the vertical mill for grinding according to the mass ratio of 1;
(4) If S95 powder is directly purchased from slag, homogenizing and mixing the S95 powder and the dried or baked desulfurized gypsum by using a small Raymond mill according to the mass ratio of 1.
3. Application method of full-solid waste filling cementing material
(1) Respectively transporting the steel slag micro powder and the slag-desulfurized gypsum mixed powder to a mine filling station by adopting a cement powder tank truck, and pumping the steel slag micro powder and the slag-desulfurized gypsum mixed powder into a steel slag powder bin and a mixed powder bin of the filling station by using an air pump;
(2) When the mine is filled and pulped, a metering system of a filling station is used, steel slag powder and mixed powder are discharged according to the mass ratio of 1.85-1.
The present invention will be further described with reference to the following examples.
Example 1: the steel slag, the slag and the desulfurized gypsum in the coal mine filling cementing material are obtained from a certain steel company in Fujian by weight: 30% of steel slag micro powder, 52% of slag and 18% of desulfurized gypsum; the slag and the desulfurized gypsum are ground together. The chemical components of the steel slag are shown in a table 1, and the alkalinity
Figure 600399DEST_PATH_IMAGE001
The particle size distribution curve of the steel slag micropowder is shown in figure 1.
Table 1: chemical composition of steel slag of Fujian certain iron and steel company
Figure 845436DEST_PATH_IMAGE003
The chemical components of the slag are shown in Table 2, and the mass coefficients
Figure 454534DEST_PATH_IMAGE004
Coefficient of activity
Figure 584164DEST_PATH_IMAGE005
. The particle size distribution curve of the fine slag powder is shown in fig. 2. The chemical composition of the desulfurized gypsum is shown in Table 3, wherein SO 3 The content is 50.2%>38%。
Table 2: chemical composition of slag of Fujian iron and steel company
Figure 867378DEST_PATH_IMAGE007
Table 3: chemical composition of desulfurized gypsum of Fujian iron and Steel company
Figure 548895DEST_PATH_IMAGE009
The coal gangue is taken from a coal mine in Fujian Longyan region, and the mass fractions of the crushed coal gangue are 25% by mass, 40% by mass and 35% by mass in a coarse fraction (10 to 15 mm), a medium fraction (5 to 10 mm) by mass and a fine fraction (0 to 5 mm) by mass. Filling slurry is prepared according to the mass ratio of the cementing material to the coal gangue to the water being 1.
Example 2: the steel slag micro powder of the coal mine filling cementing material is obtained from a certain steel company Hami in Xinjiang, the desulfurized gypsum is obtained from a certain power plant in Xinjiang, the slag micro powder is obtained from S95 powder produced by a certain steel company in Hebei, the slag micro powder and the desulfurized gypsum are mixed in a homogenizing way, and the total solid waste filling cementing material is prepared from the following components in parts by weight: 35% of steel slag micro powder and 65% of mixed powder of desulfurized gypsum and slag micro powder. The chemical components of the steel slag are shown in Table 5, and the alkalinity coefficient
Figure 550349DEST_PATH_IMAGE010
Table 5: chemical composition of steel slag of Xinjiang Hami certain Steel company
Figure 483670DEST_PATH_IMAGE012
The grain size distribution curve of the steel slag micropowder is shown in figure 3, and the X-ray diffraction pattern is shown in figure 4. The particle size distribution curve of the slag micropowder is shown in figure 5, the X-ray diffraction spectrum is shown in figure 6, the chemical components of the slag are shown in table 6, and the mass coefficient
Figure 746024DEST_PATH_IMAGE013
Coefficient of activity
Figure 739388DEST_PATH_IMAGE014
X-ray diffraction pattern of desulfurized gypsumSee FIG. 7, chemical composition is shown in Table 7, SO 3 The content is 42.2 percent.
Table 6: chemical composition of slag of Hebei iron and Steel company
Figure 962559DEST_PATH_IMAGE016
Table 7: chemical composition of desulfurized gypsum of certain power plant in Xinjiang
Figure 433991DEST_PATH_IMAGE018
The coal gangue is taken from certain Ore coal in Ordos Earduos, crushed into a certain size fraction and mixed with the sand by the proportion of 1. The sand-lime ratio of the prepared filling slurry is 1.
Table 8: particle size grading of crushed coal gangue and sand
Figure 816431DEST_PATH_IMAGE020
Table 9: cementitious fill strength and cost
Figure 980696DEST_PATH_IMAGE022
Therefore, aiming at the mixed aggregate of coal gangue and sand, the strength of the filled cementing material is higher than that of a 42.5 cement filler, and is 1.24 to 1.43 times of that of the cement filler under the same condition, and the cost of the cementing material is only about half of that of the cement.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (6)

1. The cementing material for coal gangue cemented filling is characterized by being prepared from three industrial solid wastes, namely S95 slag micro powder, converter steel slag micro powder and power plant desulfurized gypsum, according to the following weight proportion: 30-35% of steel slag micro powder, 15-20% of power plant desulfurized gypsum and 45-55% of slag micro powder.
2. The cementitious material for coal gangue cementitious filling of claim 1, wherein the basicity coefficient of the converter steel slag isM=CaO/[SiO 2 +P 2 O 5 ]Not less than 1.8; the powder plus 45 mu m sieve residue is less than or equal to 10 percent or the Boehringer specific surface area is more than or equal to 430m 2 Per kg; the content of free calcium oxide is less than or equal to 8 percent; SO in chemical components of power plant desulfurization gypsum 3 The content is more than or equal to 38 percent; the slag micro powder meets the requirement of S95 powder in GB/T18046-2017.
3. The production method of the cementing material for coal gangue cement filling according to any one of the claims 1 to 2, characterized by comprising the following steps:
s1, grinding and deironing the steel slag by adopting a large roller mill and a small ball mill in combination with an electromagnetic screen column, and pumping the ground finished product into a finished product bin 1 for storage;
s2, homogenizing the desulfurized gypsum and the slag by adopting a Raymond mill according to the mass ratio of 1.
4. The method for producing the cementing material for coal gangue cement filling as defined in claim 3, wherein the steel slag after being processed by the large roller press is processed by the electromagnetic screen column for 2-3 times and then enters the small ball mill.
5. The production method of cementitious material for coal gangue cement filling as defined in claim 3, wherein the electromagnetic screen column comprises a visible casing having a cylindrical shape, at least one electromagnetic screen mounted in the visible casing by bolts, and a vibration motor mounted on an outer wall of the visible casing.
6. The use method of the cementing material for coal gangue cemented filling is characterized by comprising the following steps:
s1, respectively transporting steel slag micro powder, slag and desulfurized gypsum mixed powder to a mine filling station by adopting a cement powder transport tank truck, and respectively driving the steel slag micro powder, the slag and the desulfurized gypsum mixed powder into a steel slag powder bin and a mixed powder bin of the filling station;
s2, when the mine is filled and pulped, discharging the steel slag powder and the mixed powder according to the mass ratio of 1.85-1.3 by using a metering system of a filling station, adding a proper amount of water and coal gangue aggregate according to the mine filling ratio, stirring, pumping into a high-temperature high-pressure homogenizer, and homogenizing at 200 ℃ under the condition of 200Mpa for 30-40min to obtain filling slurry.
CN202211084333.8A 2022-09-06 2022-09-06 Cementing material for coal gangue cemented filling and production and use methods thereof Pending CN115385589A (en)

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CN210585379U (en) * 2019-08-31 2020-05-22 衣艳超 Dry powder electromagnetic iron remover
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CN111807730A (en) * 2020-06-15 2020-10-23 北京科技大学 Full-solid waste cementing material for fine tailing filling and preparation method
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李立涛;高谦;肖柏林;温震江;吴凡;: "工业固废开发充填胶凝材料概述与应用展望" *
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