CN116283006B - Production method of stone powder with controllable activity for preparing cavity slag - Google Patents
Production method of stone powder with controllable activity for preparing cavity slag Download PDFInfo
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- CN116283006B CN116283006B CN202310187454.3A CN202310187454A CN116283006B CN 116283006 B CN116283006 B CN 116283006B CN 202310187454 A CN202310187454 A CN 202310187454A CN 116283006 B CN116283006 B CN 116283006B
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- 239000000843 powder Substances 0.000 title claims abstract description 141
- 239000004575 stone Substances 0.000 title claims abstract description 130
- 230000000694 effects Effects 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 239000002893 slag Substances 0.000 title claims abstract description 23
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- 238000012216 screening Methods 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 11
- 238000003860 storage Methods 0.000 claims abstract description 10
- 238000009924 canning Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 29
- 239000011435 rock Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 18
- 238000012986 modification Methods 0.000 claims description 15
- 230000004048 modification Effects 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229910021487 silica fume Inorganic materials 0.000 claims description 7
- 239000003607 modifier Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000013543 active substance Substances 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000009700 powder processing Methods 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
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- 230000005641 tunneling Effects 0.000 claims description 3
- 239000010953 base metal Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 description 15
- 235000019738 Limestone Nutrition 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000002585 base Substances 0.000 description 7
- 239000006028 limestone Substances 0.000 description 7
- 239000010459 dolomite Substances 0.000 description 5
- 229910000514 dolomite Inorganic materials 0.000 description 5
- 239000010438 granite Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000002019 doping agent Substances 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 4
- 239000004579 marble Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
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- 150000002739 metals Chemical class 0.000 description 3
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- 238000010276 construction Methods 0.000 description 2
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- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a production method of stone powder with controllable activity for preparing hole slag, which comprises the following steps: s1, three-stage selection is carried out on the parent metal, the mud content is controlled, and the stone powder quality is controlled from the source. S2, crushing qualified parent metal to different degrees through a jaw crusher, a cone crusher and a high-efficiency impact crusher in sequence, wherein the high-efficiency impact crusher performs twice crushing. S3, conveying the parent metal subjected to the four-stage crushing to a vibration type screening machine with corresponding particle size for screening after each crushing. S4, conveying the stone powder and the ore with the crushed particle size of 0-5 mm collected in the dust collector storage bin to the ball mill storage hopper by a lifter, and uniformly, quantitatively and continuously conveying the stone powder and the ore into a main grinding chamber of the horizontal ball mill by a vibration feeder for grinding. S5, detecting the activity of the stone powder after the grinding stage. S6, mixing the high-activity substances into the ground stone powder, and directly canning the refined modified stone powder after the high-activity substances are detected to be qualified.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a production method of stone powder with controllable activity for preparing hole slag.
Background
At present, engineering construction of bridges, tunnels, roadbeds, station houses, roads and the like has great demands on concrete sand materials, and tunnel hole residues are used as raw materials for producing machine-made sand in a large amount of engineering nowadays because natural sand resources are not renewable in a short period and the ecological environment is adversely affected in the exploitation process. A large amount of stone powder is produced in the machine-made sand preparation process, and the disposal of the stone powder easily causes environmental pollution and land resource waste. Meanwhile, the demand of concrete engineering construction for the fly ash admixture is increasing, but the use cost of the fly ash is higher, which is not beneficial to project cost control. The stone powder with a certain proportion is used for replacing the fly ash, so that natural resources can be effectively saved and the cost of the concrete can be reduced, but the stone powder is an inert substance and has poor activity, so that the stone powder needs to be modified to ensure that the concrete has good mechanical properties. Therefore, a production method capable of flexibly customizing the stone powder modification scheme according to the characteristics of the base material is needed, so that the problems of environmental pollution, land resource waste and poor stone powder activity are solved.
In order to solve the problems that the existing stone powder production process is unreasonable, the stone powder concrete has low compressive strength caused by the fact that the parent materials are not consistent in type and the stone powder activity is poor, many experts and scholars have conducted intensive researches on the stone powder concrete, such as:
the Chinese patent with publication number of CN114988738A discloses a preparation method of modified dolomite powder, which solves the problems of bleeding, strength and durability of dolomite powder concrete in the prior art by blending a dissolution promoter, capillary pore filler and the like into the dolomite powder to promote the dissolution of the dolomite powder surface, participate in hydration reaction and capillary pore filling triple modification. However, the method can only be applied to dolomite raw materials, and the source of the hole slag is wide, the stone material is various, and the method is not suitable for the method.
Chinese patent publication No. CN113603382a discloses a modified limestone powder for making concrete, which improves the corrosion resistance of limestone powder concrete in tunnels under high water pressure and sulfate attack environment by doping lecithin, water glass, polyvinyl alcohol, hollow glass beads, etc. into the limestone powder. However, the method can only be applied to limestone powder, and can only solve the problem of poor activity of the limestone powder, namely the corrosion resistance of the limestone powder concrete.
The Chinese patent with publication number of CN115477529A discloses a granite stone powder-based concrete and a preparation method thereof, wherein the granite stone powder is changed from hydrophilic to hydrophobic by chemical modification of stone powder, so that the problems of large water absorption of the granite stone powder, adsorption of additives and the like are solved, and the workability of a granite stone powder concrete mixture is improved. Similarly, the method can only be modified based on granite powder, the chemical modification steps are complex, the used pH regulator ammonia belongs to dangerous chemicals, and potential safety hazards are easily generated for operators.
The Chinese patent with publication number of CN103553372A discloses a method for producing lime by using waste marble powder, which is characterized in that the applicable marble powder is directly or after being granulated and formed, is fed into an industrial kiln for calcination, so that the marble is calcined and decomposed to produce high-quality light burned lime with small particles, high porosity and high activity, thereby being beneficial to reducing the consumption of natural limestone mine resources and promoting the sustainable development of stone industry. However, this method is only applicable to waste marble produced in stone industry, and is not applicable to a material mixed with stone such as hole slag.
Therefore, aiming at the problem of poor quality of stone powder concrete caused by poor activity due to different stone powder parent metals, it is necessary to provide a production method of novel modified stone powder which can be flexibly proportioned and pertinently modified according to the activity of the stone powder, and the production method has the advantages of simple preparation process, low production cost and good economic benefit.
Disclosure of Invention
The invention aims to solve the problems and provide the stone powder production method with controllable activity based on tunnel excavation hole slag preparation, which is characterized in that the activity detection result of the stone powder production is used for flexibly controlling parameters such as the type, the quantity and the doping mode of the doping substances, so that the stone powder prepared from different base materials can reach optimal activity.
In order to solve the technical problems, the technical scheme of the invention is as follows: a production method of stone powder with controllable activity for preparing cavity slag comprises the following steps:
s1, three-level selection is carried out on a parent metal, the mud content of the parent metal is controlled, and the stone powder quality is controlled from the source;
s2, crushing qualified parent metal to different degrees through a jaw crusher, a cone crusher and a high-efficiency impact crusher in sequence, wherein the high-efficiency impact crusher is used for crushing twice, and a powder collector port is arranged at an output port of each crusher and can collect stone powder generated in the crushing process to a powder collector bin;
s3, conveying the parent metal subjected to four-stage crushing to vibration type screening machines with corresponding particle sizes for screening after each crushing is finished, wherein the output port of each screening machine is also provided with a powder collector port, and the stone powder generated in the screening process can be collected to a powder bin of the powder collector;
s4, conveying the stone powder and the ore with the crushed particle size of 0-5 mm collected in the dust collector storage bin to a ball mill storage hopper by a lifter, and uniformly, quantitatively and continuously conveying the stone powder and the ore into a main grinding chamber of a horizontal ball mill by a vibration feeder for grinding, wherein the particle size of the stone powder after grinding is within the range of 10-30+/-2.5 mu m;
s5, carrying out activity detection on the stone powder after the grinding stage, wherein the stone powder with the activity index result of 75% or more is regarded as reaching the standard and is classified as a finished product for storage, and carrying out next modification treatment on unqualified stone powder;
s6, mixing the high-activity substances into the ground stone powder, determining the types, the amounts and the mixing modes of the mixed active substances according to the characteristics of the parent materials, the stone powder activity detection results and the like, performing activity detection again on the stone powder subjected to modification treatment, and directly canning the refined modified stone powder after the detection is qualified.
Further, the step S1 includes the following sub-steps:
s11, measuring indexes such as mud content, rock strength, water content and the like of the ore to be beneficiated, namely lithology detection, and identifying the availability qualification of the qualified ore after inspection, wherein the rock is not easy to crush and is not obviously softened when meeting water, and the mechanical property of the rock is not obviously highly anisotropic;
s12, performing primary screening on the composite ore by using a fence type bucket excavator, removing stone scraps below 10mm and clamping dust, and conveying qualified ore to a workshop raw material room;
s13, primarily removing the clay mixed with the ores among the raw materials through a mudstone separator, reducing the mud content of the parent metal, and transporting the parent metal treated by the mudstone separator to a stone powder processing factory.
Further, the stone powder raw material in the step S1 is hole slag generated during tunneling, and the rock component is single or multiple rock inclusions.
Further, in the lithology detection in the step S11, rock blocks with saturated compressive strength greater than 90MPa, point load strength index greater than 4.0MPa and rebound hardness greater than 65 should be selected, small rocks, dust and stone chips with particle diameters less than 10mm are removed by a grid excavator when dust is removed, and finally, the mud content is controlled by a mud rock separator, and the mud content in the final parent metal is less than 0.2%.
Further, in the step S2, after the base material is crushed by four stages of jaw crushers, cone crushers and twice high-efficiency impact crushers, sand particles are crushed to 0-5 mm.
Further, the high active material in the step S6 is silica fume, the silica fume is mixed with the ground stone powder, the mixing is modified according to the characteristics of the parent material, the stone powder activity detection result and the like, a physical doping method and a silica powder modifier are used for detecting the activity of the modified stone powder again, and after the detection is qualified, the refined modified stone powder can be directly canned.
The beneficial effects of the invention are as follows:
1. according to the stone powder production method with controllable activity for preparing the hole slag, disclosed by the invention, the parent metal is mainly derived from the hole slag, so that the resource recycling is realized, the ecological environment is protected, and the effective utilization of land resources is facilitated.
2. The invention adopts a multi-stage crushing and screening method of a multi-type crusher and a pulverizer to process the base material, and the obtained stone powder has more uniform particle size.
3. The activity of the active dopants in the obtained modified stone powder is ensured to be optimal and the modified stone powder has higher dispersibility through repeated activity detection in the production process of the modified stone powder, so that the quality of the stone powder is ensured, and the stone powder concrete has good mechanical properties.
4. According to the invention, stone powder from different parent metals can be selected in a targeted manner in terms of active dopant type, dosage and doping mode, and finally modified stone powder with optimal indexes is obtained, so that the preparation method has more comprehensive preparation flow and evaluation indexes compared with the traditional stone powder modification aiming at a certain condition. The modified stone powder can be used for replacing the fields of mixing fly ash into concrete and the like, the production cost can be obviously reduced on the premise of not influencing the product quality, a foundation is laid for the high-efficiency and high-quality stone powder preparation process, the modified stone powder is beneficial to popularization and application, and the economic benefit potential is huge.
5. The invention can flexibly proportion and pertinently modify the novel modified stone powder according to the activity of the stone powder, has simple preparation process and low production cost, and can create good economic benefit.
Drawings
FIG. 1 is a process flow diagram of a method for producing stone dust with controllable activity for hole slag preparation according to the invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific examples:
as shown in FIG. 1, the method for producing the stone powder with controllable activity for preparing the hole slag provided by the invention comprises the following steps:
s1, three-stage selection is carried out on the parent metal, the mud content is controlled, and the stone powder quality is controlled from the source.
The stone powder raw material in the step S1 is hole slag generated during tunneling, and rock components of the hole slag are single or multiple rock inclusions. The method is characterized in that indexes such as mud content, rock strength, water content and the like of the ore to be beneficiated are measured, the qualified ore is identified, the rock mass is not easy to crush and is not obviously softened when meeting water, and the mechanical property of the rock mass is not obviously highly anisotropic. In addition, the quality of raw materials is controlled on the premise of ensuring that other engineering adverse characteristics are not generated.
In this embodiment, step S1 includes the following sub-steps:
s11, measuring indexes such as mud content, rock strength, water content and the like of the ore to be beneficiated, namely lithology detection, and identifying the availability qualification of the qualified ore after inspection, wherein the rock is not easy to crush and is not obviously softened when meeting water, and the mechanical property of the rock is not obviously highly anisotropic. On the premise of ensuring no other adverse characteristics to engineering, the quality of raw materials is controlled, and the method specifically comprises the following steps:
TABLE 1 mechanical Properties of the parent rock
TABLE 2 Point load Strength index and rebound hardness of parent rock
In the lithology detection in the step S11, rock blocks with saturated compressive strength greater than 90MPa, point load strength index greater than 4.0MPa and rebound hardness greater than 65 are selected, small rocks, dust and stone chips with particle size less than 10mm are removed through a grid excavator when dust is removed, finally, the mud content is controlled by a mud rock separator, and finally, the mud content in a base metal is less than 0.2%.
S12, performing primary screening on the composite ore by using a fence type bucket excavator, removing stone scraps below 10mm and clamping dust, and transporting qualified ore to a workshop raw material room.
S13, primarily removing the clay mixed with the ores among the raw materials through a mudstone separator, reducing the mud content of the parent metal, and transporting the parent metal treated by the mudstone separator to a stone powder processing factory.
S2, crushing qualified parent metal to different degrees sequentially through a jaw crusher, a cone crusher and a high-efficiency impact crusher, wherein the high-efficiency impact crusher is used for crushing twice, and a powder collector port is arranged at an output port of each crusher and can collect stone powder generated in the crushing process to a powder collector bin.
In the step S2, the base material is crushed to 0-5 mm after four-stage crushing by a jaw crusher, a cone crusher and a twice high-efficiency impact crusher, so that the subsequent grinding efficiency is improved.
S3, after each crushing, the base material subjected to four-stage crushing is conveyed to a vibration type screening machine with corresponding particle size for screening, and the output port of each screening machine is also provided with a powder collector port, so that stone powder generated in the screening process can be collected to a powder bin of the powder collector.
S4, conveying the stone powder and the ore with the crushed particle size of 0-5 mm collected in the dust collector storage bin to a ball mill storage hopper by a lifter, and uniformly, quantitatively and continuously conveying the stone powder and the ore into a main grinding chamber of a horizontal ball mill by a vibration feeder for grinding, wherein the particle size of the stone powder after grinding is within the range of 10-30+/-2.5 mu m.
S5, carrying out activity detection on the stone powder after the grinding stage, wherein the stone powder with the activity index result of 75% or more is regarded as reaching the standard and is stored as a finished product, and carrying out the next modification treatment on the unqualified stone powder.
S6, mixing the high-activity substances into the ground stone powder, determining the types, the amounts and the mixing modes of the mixed active substances according to the characteristics of the parent materials, the stone powder activity detection results and the like, performing activity detection again on the stone powder subjected to modification treatment, and directly canning the refined modified stone powder after the detection is qualified.
The high-activity substance in the step S6 is silica fume, the silica fume is mixed with the ground stone powder, modification is carried out according to the characteristics of the parent material, the stone powder activity detection result and the like during mixing, a physical doping method and a silicon powder modifier are used for carrying out activity detection again on the stone powder after modification treatment, and after the detection is qualified, the refined modified stone powder can be directly canned.
Since the stone powder produced by different types of base materials has different activities, the types of the high-activity substances are selected and the doping proportion is different when the stone powder is modified, and the high-activity dopants should be silica fume (the main component is SiO 2 ) Aluminum powder (main component is Al) 2 O 3 ) When mixed with cement and lime, the water produces alkali excitant and Ca (OH) in the alkali excitant 2 The compound which is subjected to chemical reaction and can generate gel such as calcium silicate hydrate is mainly used, and the specific doping amount is as follows:
TABLE 3 selection of modifier blend in stone powder modification
The invention is used in the process of using: the method comprises the steps of carrying out lithology detection, dust-clamping removal and mudstone separation three-stage screening on a parent metal, carrying out four-stage crushing and four-stage screening on the parent metal through a jaw crusher, a cone crusher and a twice high-efficiency impact crusher, carrying out activity detection on the parent metal after grinding through a horizontal ball mill, packaging the parent metal if the parent metal is qualified (the activity index is more than 75%), flexibly selecting the types (silicon powder modifier and aluminosilicate stone powder modifier) and the quantity (10% -30% of stone powder proportion) of the dopant according to the activity index result if the parent metal is unqualified, and finally enabling the stone powder activity index of different parent metals to reach 75% -80%.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (6)
1. The production method of the stone powder with controllable activity for preparing the cavity slag is characterized by comprising the following steps of:
s1, three-level selection is carried out on a parent metal, the mud content of the parent metal is controlled, and the stone powder quality is controlled from the source;
s2, crushing qualified parent metal to different degrees through a jaw crusher, a cone crusher and a high-efficiency impact crusher in sequence, wherein the high-efficiency impact crusher is used for crushing twice, and a powder collector port is arranged at an output port of each crusher and can collect stone powder generated in the crushing process to a powder collector bin;
s3, conveying the parent metal subjected to four-stage crushing to vibration type screening machines with corresponding particle sizes for screening after each crushing is finished, wherein the output port of each screening machine is also provided with a powder collector port, and the stone powder generated in the screening process can be collected to a powder bin of the powder collector;
s4, conveying the stone powder and the ore with the crushed particle size of 0-5 mm collected in the dust collector storage bin to a ball mill storage hopper by a lifter, and uniformly, quantitatively and continuously conveying the stone powder and the ore into a main grinding chamber of a horizontal ball mill by a vibration feeder for grinding, wherein the particle size of the stone powder after grinding is within the range of 10-30+/-2.5 mu m;
s5, carrying out activity detection on the stone powder after the grinding stage, wherein the stone powder with the activity index result of 75% or more is regarded as reaching the standard and is classified as a finished product for storage, and carrying out next modification treatment on unqualified stone powder;
s6, mixing the high-activity substances into the ground stone powder, determining the types, the amounts and the mixing modes of the mixed active substances according to the characteristics of the parent materials and the stone powder activity detection result during mixing, detecting the activity of the modified stone powder again, and directly canning the refined modified stone powder after the detection is qualified.
2. A method for producing stone dust with controllable activity for hole slag preparation according to claim 1, wherein the step S1 comprises the following sub-steps:
s11, measuring indexes of mud content, rock strength and water content of the prepared ore, namely lithology detection, and identifying the availability qualification of the qualified ore, wherein the rock is not easy to crush and is not obviously softened when meeting water, and the mechanical property of the rock is not obviously highly anisotropic;
s12, performing primary screening on the composite ore by using a fence type bucket excavator, removing stone scraps below 10mm and clamping dust, and conveying qualified ore to a workshop raw material room;
s13, primarily removing the clay mixed with the ores among the raw materials through a mudstone separator, reducing the mud content of the parent metal, and transporting the parent metal treated by the mudstone separator to a stone powder processing factory.
3. The method for producing stone dust with controllable activity for preparing hole slag according to claim 1, which is characterized in that: the stone powder raw material in the step S1 is hole slag generated during tunneling, and rock components of the hole slag are single or multiple rock inclusions.
4. The method for producing stone powder with controllable activity for preparing hole slag according to claim 2, which is characterized in that: in the lithology detection in the step S11, rock blocks with saturated compressive strength greater than 90MPa, point load strength index greater than 4.0MPa and rebound hardness greater than 65 are selected, small rocks, dust and stone chips with particle size less than 10mm are removed through a grid excavator when dust is removed, finally, the mud content is controlled by a mud rock separator, and finally, the mud content in a base metal is less than 0.2%.
5. The method for producing stone dust with controllable activity for preparing hole slag according to claim 1, which is characterized in that: in the step S2, the base material is crushed to 0-5 mm after four-stage crushing by a jaw crusher, a cone crusher and a twice high-efficiency impact crusher.
6. The method for producing stone dust with controllable activity for preparing hole slag according to claim 1, which is characterized in that: the high-activity substance in the step S6 is silica fume, the silica fume is mixed with the ground stone powder, modification is carried out according to the characteristics of a parent material and the stone powder activity detection result during mixing, a physical doping method and a silicon powder modifier are used for carrying out activity detection again on the stone powder after modification treatment, and after the detection is qualified, the refined modified stone powder can be directly canned.
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