CN115159908A - Wet-sprayed concrete taking gold tailings as aggregate and preparation method thereof - Google Patents
Wet-sprayed concrete taking gold tailings as aggregate and preparation method thereof Download PDFInfo
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- CN115159908A CN115159908A CN202210897975.3A CN202210897975A CN115159908A CN 115159908 A CN115159908 A CN 115159908A CN 202210897975 A CN202210897975 A CN 202210897975A CN 115159908 A CN115159908 A CN 115159908A
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000010931 gold Substances 0.000 title claims abstract description 65
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 65
- 239000011378 shotcrete Substances 0.000 title claims description 15
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 55
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 50
- 238000005507 spraying Methods 0.000 claims abstract description 48
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 238000012986 modification Methods 0.000 claims abstract description 24
- 230000004048 modification Effects 0.000 claims abstract description 24
- 150000002343 gold Chemical class 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000004568 cement Substances 0.000 claims description 14
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 11
- 230000000996 additive effect Effects 0.000 claims description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 239000010775 animal oil Substances 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 5
- 239000008158 vegetable oil Substances 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000004381 surface treatment Methods 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 239000004576 sand Substances 0.000 description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 25
- 239000002245 particle Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 239000010811 mineral waste Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses wet spraying concrete taking gold tailings as aggregate and a preparation method thereof, wherein the wet spraying concrete comprises modified gold tailings, and is characterized in that: the concrete also comprises a cementing material, a water reducing agent, an accelerator and water; wherein the cementing material accounts for 1 part by weight, the gold tailings subjected to modification treatment account for 3.0-5.0 times of the cementing material, the water reducing agent accounts for 0.55-1.5% of the cementing material, the accelerating agent accounts for 6-9% of the cementing material, and the balance is water. By adopting the technical scheme, the gold tailings are used as all aggregates of the wet-spraying concrete, and the water absorption performance and the edge angle performance of the gold tailings are changed through the surface treatment, raw material selection and proportioning design of the tailings, so that the water demand, the workability, the contractibility and the strength of the wet-spraying concrete are better, and the requirements of general engineering can be met.
Description
Technical Field
The invention relates to wet spraying concrete and a preparation method thereof, in particular to the wet spraying concrete taking gold tailings as aggregate and the preparation method thereof.
Background
The fine aggregate is one of the main components of concrete, and the quality of the fine aggregate has important influence on the workability of concrete mixture, the physical mechanical properties and durability of hardened concrete and the like. The fine aggregate is classified into natural sand and artificial sand from the source. The artificial sand is made of rock particles with nominal particle size less than 5.00mm through earth removing, mining, mechanical crushing and sieving. The natural sand resource is non-renewable in a short time, in recent years, along with the increasing development of basic construction, the natural sand resource is gradually reduced in a plurality of areas in China, the quantity and the quality of sand cannot meet the requirements of sand for construction, and the progress and the quality of engineering construction are influenced. The governments of the country and each place have successively made the regulations of prohibiting or limiting the production of natural sand. The development of artificial sand and the search for new resources of sand are imperative. The artificial sand produced by using local rock resources or waste rocks discarded by engineering becomes an indispensable alternative resource of natural sand.
The tailings are solid mineral waste materials formed after the dehydration of ore pulp discharged by a dressing plant, and are one of the bulk solid waste materials with the largest output and the lowest comprehensive utilization rate in China at present. Most of tailings in China are not effectively utilized, the tailings are discharged into a tailing pond to be stacked in a traditional tailing treatment mode, the tailings are stacked in a large quantity, a large amount of land is occupied, the environment is polluted, potential safety hazards such as dam break and debris flow are easily formed, the tailings become public hazards, and great economic burden is brought to a mine factory.
Currently, tailings are often used to fill underground goafs, but the amount of tailings produced by a mill is often greater than the amount of tailings required for filling. Taking a gold mine in Guizhou as an example, 128 million tons of tailings are produced annually, the annual filling amount of the tailings is 51 million tons, and the utilization rate is only 40%. The tailings are used for replacing natural gravels to serve as all aggregates of the wet-spraying concrete, so that the exploitation of the natural gravels can be reduced, gaps of raw materials for producing the wet-spraying concrete can be filled, and waste can be changed into valuable.
However, it is not suitable to directly use gold tailings instead of natural aggregate as machine-made sand as the whole aggregate of wet-sprayed concrete. Because the tailing particles are extremely fine, when the traditional cement cementing material is adopted for preparation, the following important technical problems exist:
1. the tailing particles do not reach the standard fineness
Tailings are generally products which are finely ground in a beneficiation process, and particles are fine. Taking the granularity test result of gold mine tailings in Shaanxi as an example, the fineness modulus of the tailings is only 0.55-0.58 and cannot reach the fineness modulus of superfine sand of the building specification through calculation. In addition, the content of stone powder with the particle size of less than 0.075mm in the tailings is 18.5%, and the requirement of the content of the stone powder in the construction sand is also exceeded.
When the tailings are used for replacing all the building sand to prepare the wet-sprayed concrete, the water consumption of the concrete is greatly increased due to small granularity and large specific surface area of the tailings, so that the porosity in the hardened concrete is increased, and the strength is reduced.
2. The soil content in the tailings exceeds the standard
The tailings are discharged into the valleys directly because the tailings are not limited to the stacking environment in the discharge process. During stacking for many years, soil is wrapped in due to rainwater erosion of the stacking environment, landslide, cofferdam collapse and the like, so that the mud content in tailings exceeds the standard. Similarly, taking a gold mine in Shaanxi as an example, the content of mud blocks in the tailings is 3.0%, which exceeds the limit of building sand on the content of mud blocks, and the content of mud in the tailings is not calculated.
The soil existing in powder form is difficult to separate, is a harmful component in the preparation of wet spraying concrete, and not only increases the water consumption of the concrete, but also increases the shrinkage of the concrete and deteriorates the binding force.
3. The friction force between tailing particles is large
Microscopic analysis shows that compared with river sand, the tailings have sharp multi-edge angles, and the numerical value is obviously higher through testing of the edge angle property and the internal friction angle, the edge angle property numerical value is higher than that of the river sand by 31%, and the internal friction angle is also higher than that of the river sand by nearly 5%. The angularity and the internal friction angle of tailings are large, so that the movement resistance among particles can be increased, the fluidity of concrete is influenced, the tailings are easy to stick to a nozzle, and the tailings are not beneficial to the construction and application of wet-sprayed concrete.
Due to the existence of the problems, the application of the mineral resources in the wet spraying concrete of the tunnel is influenced. At present, no application report of replacing all aggregates with tailings to be applied to tunnel wet spraying concrete in a large scale is seen.
Disclosure of Invention
The invention aims to provide wet-spraying concrete which needs water, has good workability, good contractibility and good strength and takes gold tailings as aggregates and a preparation method thereof.
The invention aims to realize the technical scheme that the wet spraying concrete with the gold tailings as the aggregate comprises the modified gold tailings, and further comprises a cementing material, a water reducing agent, an accelerator and water; wherein the cementing material accounts for 1 part by weight, the gold tailings subjected to modification treatment account for 3.0-5.0 times of the cementing material, the water reducing agent accounts for 0.55-1.5% of the cementing material, the accelerating agent accounts for 6-9% of the cementing material, and the balance is water.
The cementing material is composed of cement and an active mineral admixture, wherein the cement accounts for 60% -90%, and the active mineral admixture is fly ash, silica fume or blast furnace granulated slag.
The gold tailings after modification treatment need to be treated by a No. 1 modification treatment agent and a No. 2 modification treatment agent; wherein, the No. 1 modifying treatment agent is a mixture of animal oil or vegetable oil and ethanol solution, and the dosage of the modifying treatment agent is 0.001 to 0.003 percent of the dosage of the gold tailings; the No. 2 modifying agent is 40% sodium hydroxide solution or sodium carbonate solution, and the dosage of the modifying agent is 0.001% -0.002% of the dosage of the gold tailings.
Wherein the water reducing agent is a polycarboxylic acid water reducing agent.
A preparation method of wet-spraying concrete taking gold tailings as aggregates comprises the following steps:
(1) Stirring the No. 1 modifying treatment agent uniformly at 50-60 ℃, adding the gold tailings subjected to mechanical screening to remove mud lumps, mixing and heating for 0.5 hour, then adding the No. 2 modifying treatment agent, continuously mixing, stirring and heating for 1 hour to obtain modified gold tailings;
(2) Uniformly mixing the concrete mixing water and the water reducing agent to obtain an additive aqueous solution;
(3) Uniformly mixing the gelled material and the modified gold tailings in a forced mixer to obtain a dry tailing concrete material;
(4) Adding the additive aqueous solution into the tailing concrete dry material, slowly stirring for 3 minutes, standing for 5 minutes, and finally quickly stirring for 3 minutes to obtain newly-mixed tailing concrete slurry;
(5) And (3) conveying the tailing concrete slurry to a wet spraying machine, adding an accelerating agent through the wet spraying machine, and spraying through a spray head to obtain the wet spraying concrete.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) The gold tailings are used as all aggregates of the wet spraying concrete, the water absorption performance and the edge angle performance of the gold tailings are changed through surface treatment, raw material selection and proportioning design of the tailings, and the wet spraying concrete has good water demand, workability, contractibility and strength and can meet the requirements of general construction engineering;
(2) The invention adopts the gold tailings as all aggregates of the wet spraying concrete, is beneficial to the large-scale utilization of the tailings which are solid wastes, not only protects the environment, reduces the exploitation of natural sand stones, saves resources, but also reduces the production cost of the wet spraying concrete.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1: the wet spraying concrete with the gold tailings as the aggregate comprises the gold tailings after modification treatment, and further comprises a cementing material, a water reducing agent, an accelerator and water; wherein the cementing material accounts for 1 part by weight, the gold tailings subjected to modification treatment account for 3.0-5.0 times of the cementing material, the water reducing agent accounts for 0.55-1.5% of the cementing material, the accelerating agent accounts for 6-9% of the cementing material, and the balance is water.
The cementing material is composed of cement and an active mineral admixture, wherein the cement accounts for 60% -90%; the active mineral admixture is fly ash.
The gold tailings after modification treatment need to be treated by a No. 1 modification treatment agent and a No. 2 modification treatment agent; wherein, the No. 1 modifying treatment agent is a mixture of animal oil or vegetable oil and ethanol solution, and the dosage of the modifying treatment agent is 0.002 percent of the dosage of the gold tailings; the No. 2 modifying agent is 40% sodium hydroxide solution or sodium carbonate solution, and the dosage of the modifying agent is 0.002% of that of the gold tailings.
Wherein the water reducing agent is a polycarboxylic acid water reducing agent.
A preparation method of wet spraying concrete with gold tailings as aggregates comprises the following steps:
(1) Uniformly stirring the No. 1 modifying treatment agent at 50 ℃, adding the gold tailings subjected to mechanical screening to remove mud lumps, mixing and heating for 0.5 hour, then adding the No. 2 modifying treatment agent, continuously mixing, stirring and heating for 1 hour to obtain modified gold tailings;
(2) Uniformly mixing concrete mixing water and a water reducing agent to obtain an additive aqueous solution;
(3) Uniformly mixing the gelled material and the modified gold tailings in a forced mixer to obtain a dry tailing concrete material;
(4) Adding the additive water solution into the tailing concrete dry material, slowly stirring for 3 minutes, standing for 5 minutes, and finally quickly stirring for 3 minutes to obtain newly-mixed tailing concrete slurry;
(5) And (3) conveying the tailing concrete slurry to a wet spraying machine, adding an accelerating agent through the wet spraying machine, and spraying through a spray head to obtain the wet spraying concrete.
Example 2: the wet spraying concrete with the gold tailings as the aggregate comprises the gold tailings after modification treatment, and further comprises a cementing material, a water reducing agent, an accelerator and water; wherein the cementing material accounts for 1 part by weight, the gold tailings subjected to modification treatment account for 3.0-5.0 times of the cementing material, the water reducing agent accounts for 0.55-1.5% of the cementing material, the accelerating agent accounts for 6-9% of the cementing material, and the balance is water.
The cementing material is composed of cement and an active mineral admixture, wherein the cement accounts for 60% -90%; the active mineral admixture is silica fume.
The modified gold tailings are gold tailings treated by a No. 1 modifying treatment agent and a No. 2 modifying treatment agent; wherein, the No. 1 modifying treatment agent is a mixture of animal oil or vegetable oil and ethanol solution, and the dosage of the modifying treatment agent is 0.001 percent of that of the gold tailings; the No. 2 modifying agent is 40% sodium hydroxide solution or sodium carbonate solution, and the dosage of the sodium hydroxide solution or the sodium carbonate solution is 0.001% of that of the gold tailings.
Wherein the water reducing agent is a polycarboxylic acid water reducing agent.
A preparation method of wet spraying concrete with gold tailings as aggregates comprises the following steps:
(1) Uniformly stirring the No. 1 modifying treatment agent at 55 ℃, adding the gold tailings subjected to mechanical screening to remove mud lumps, mixing and heating for 0.5 hour, then adding the No. 2 modifying treatment agent, continuously mixing, stirring and heating for 1 hour to obtain modified gold tailings;
(2) Uniformly mixing concrete mixing water and a water reducing agent to obtain an additive aqueous solution;
(3) Uniformly mixing the gelled material and the modified gold tailings in a forced mixer to obtain a dry tailing concrete material;
(4) Adding the additive aqueous solution into the tailing concrete dry material, slowly stirring for 3 minutes, standing for 5 minutes, and finally quickly stirring for 3 minutes to obtain newly-mixed tailing concrete slurry;
(5) And (3) conveying the tailing concrete slurry to a wet spraying machine, adding an accelerating agent through the wet spraying machine, and spraying the slurry through a spray head to obtain the wet sprayed concrete.
Example 3: the wet spraying concrete with the gold tailings as the aggregate comprises the gold tailings after modification treatment, and further comprises a cementing material, a water reducing agent, an accelerator and water; wherein the cementing material accounts for 1 part by weight, the gold tailings subjected to modification treatment account for 3.0-5.0 times of the cementing material, the water reducing agent accounts for 0.55-1.5% of the cementing material, the accelerating agent accounts for 6-9% of the cementing material, and the balance is water.
The cementing material is composed of cement and an active mineral admixture, wherein the cement accounts for 60% -90%, and the active mineral admixture is blast furnace granulated slag.
The gold tailings after modification treatment need to be treated by a No. 1 modification treatment agent and a No. 2 modification treatment agent; wherein, the No. 1 modifying treatment agent is a mixture of animal oil or vegetable oil and ethanol solution, and the using amount of the modifying treatment agent is 0.003 percent of that of the gold tailings; the No. 2 modifying agent is 40% sodium hydroxide solution or sodium carbonate solution, and the dosage of the modifying agent is 0.001% of that of the gold tailings.
Wherein the water reducing agent is a polycarboxylic acid water reducing agent.
A preparation method of wet spraying concrete with gold tailings as aggregates comprises the following steps:
(1) Stirring the No. 1 modifying treatment agent uniformly at 60 ℃, adding the gold tailings subjected to mechanical screening to remove mud lumps, mixing and heating for 0.5 hour, adding the No. 2 modifying treatment agent, continuously mixing, stirring and heating for 1 hour to obtain modified gold tailings;
(2) Uniformly mixing concrete mixing water and a water reducing agent to obtain an additive aqueous solution;
(3) Uniformly mixing the gelled material and the modified gold tailings in a forced mixer to obtain a dry tailing concrete material;
(4) Adding the additive water solution into the tailing concrete dry material, slowly stirring for 3 minutes, standing for 5 minutes, and finally quickly stirring for 3 minutes to obtain newly-mixed tailing concrete slurry;
(5) And (3) conveying the tailing concrete slurry to a wet spraying machine, adding an accelerating agent through the wet spraying machine, and spraying the slurry through a spray head to obtain the wet sprayed concrete.
Comparative example 1
The procedure of comparative example 1 was similar to that of examples 1-5 above, but using unmodified raw tailings, the materials and amounts thereof are shown in table 1.
Comparative example 2
The procedure of comparative example 2 was similar to that of examples 1-5 above, but using unmodified raw tailings, the materials and amounts thereof are shown in table 1.
Performance detection
1. The mixing proportion of the full-sand shotcrete is designed according to the current standard JGJ 55-2011 'design rule for the mixing proportion of common concrete', and the slump is controlled to be below 180mm by adjusting the water-cement ratio and the mixing amount of a water reducing agent. The mixing amount of the accelerator is controlled within 10 percent, the initial setting time of the cement paste is within 3min, the final setting time of the cement paste is within 12min, the rebound rate is less than 30 percent, and the detection results are detailed in table 1.
2. The wet-sprayed concrete strength test is carried out according to the GB/T50081-2019 standard of a common concrete mechanical property test method, the sizes of test pieces are 100mm multiplied by 100mm and 100mm multiplied by 300mm respectively, the cube compressive strength, the 28d split tensile strength and the 28d axial compressive strength of the concrete are tested for 7d,28d, and the table 1 shows the optimal gold tailing wet-sprayed concrete mixing ratio and performance test results.
Table 1 preferred gold tailings wet-sprayed concrete mix ratio and performance test results
As can be seen from table 1, examples 1-3 by the process of the present invention are compared to comparative examples 1 and 2 of gold tailings wet sprayed concrete without surface treatment; under the condition of similar slump, the novel gold tailing wet spraying concrete provided by the invention has the advantages of less water consumption, higher density and strength, smaller rebound rate, obvious advantages and capability of meeting the standard requirement of tunnel wet spraying concrete engineering.
In addition, the construction sand is expensive at present (taking Shaanxi as an example, the price of sand in each part of the market is about 200 yuan), so that the cost of concrete is higher. The novel gold tailing wet spraying concrete provided by the invention does not use natural sand or machine-made sand, the gold tailings are used as all aggregates, the gold tailings are used as solid waste, only the transportation cost is needed, and the dosage of the used additive is small, so that the novel gold tailing wet spraying concrete provided by the invention has an obvious cost advantage.
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 (5)
1. The wet spraying concrete with the gold tailings as the aggregate comprises the gold tailings subjected to modification treatment, and is characterized in that: the concrete also comprises a cementing material, a water reducing agent, an accelerator and water; wherein the cementing material accounts for 1 part by weight, the gold tailings subjected to modification treatment account for 3.0-5.0 times of the cementing material, the water reducing agent accounts for 0.55-1.5% of the cementing material, the accelerating agent accounts for 6-9% of the cementing material, and the balance is water.
2. The wet sprayed concrete with gold tailings as aggregate of claim 1, which is characterized in that: the cementing material is composed of cement and an active mineral admixture, wherein the cement accounts for 60-90%; the active mineral admixture is fly ash, silica fume or blast furnace granulated slag.
3. The wet sprayed concrete with gold tailings as aggregate according to claim 2, which is characterized in that: the gold tailings after modification treatment need to be treated by a No. 1 modification treatment agent and a No. 2 modification treatment agent; wherein, the No. 1 modifying treatment agent is a mixture of animal oil or vegetable oil and ethanol solution, and the dosage of the modifying treatment agent is 0.001 to 0.003 percent of the dosage of the gold tailings; the No. 2 modifying agent is 40% sodium hydroxide solution or sodium carbonate solution, and the dosage of the modifying agent is 0.001% -0.002% of the dosage of the gold tailings.
4. The wet sprayed concrete with gold tailings as aggregate of claim 3, which is characterized in that: the water reducing agent is a polycarboxylic acid water reducing agent.
5. A method for preparing wet-spraying concrete by taking gold tailings as aggregates is characterized by comprising the following steps: the method comprises the following steps:
(1) Uniformly stirring the No. 1 modifying treatment agent at 50-60 ℃, adding the gold tailings subjected to mechanical screening to remove mud lumps, mixing and heating for 0.5 hour, adding the No. 2 modifying treatment agent, continuously mixing, stirring and heating for 1 hour to obtain modified gold tailings;
(2) Uniformly mixing concrete mixing water and a water reducing agent to obtain an additive aqueous solution;
(3) Uniformly mixing the gelled material and the modified gold tailings in a forced mixer to obtain a dry tailing concrete material;
(4) Adding the additive water solution into the tailing concrete dry material, slowly stirring for 3 minutes, standing for 5 minutes, and finally quickly stirring for 3 minutes to obtain newly-mixed tailing concrete slurry;
(5) And (3) conveying the tailing concrete slurry to a wet spraying machine, adding an accelerating agent through the wet spraying machine, and spraying through a spray head to obtain the wet spraying concrete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210897975.3A CN115159908A (en) | 2022-07-28 | 2022-07-28 | Wet-sprayed concrete taking gold tailings as aggregate and preparation method thereof |
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| CN202210897975.3A CN115159908A (en) | 2022-07-28 | 2022-07-28 | Wet-sprayed concrete taking gold tailings as aggregate and preparation method thereof |
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| CN202210897975.3A Pending CN115159908A (en) | 2022-07-28 | 2022-07-28 | Wet-sprayed concrete taking gold tailings as aggregate and preparation method thereof |
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| CN (1) | CN115159908A (en) |
Cited By (1)
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| CN117865585A (en) * | 2024-02-20 | 2024-04-12 | 长安大学 | Preparation method of sprayable color concrete with gold tailing powder as full aggregate |
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| CN111807777A (en) * | 2020-04-02 | 2020-10-23 | 陕西宏城矿业有限公司 | Novel concrete with gold mine tailing powder as full aggregate and preparation method thereof |
| CN112159166A (en) * | 2020-08-31 | 2021-01-01 | 陕西宏城矿业有限公司 | Building mortar with gold mine tailings as full aggregates and preparation method thereof |
| CN113773014A (en) * | 2021-08-31 | 2021-12-10 | 中建西部建设北方有限公司 | Gold tailing concrete and preparation method thereof |
| WO2022057104A1 (en) * | 2020-09-16 | 2022-03-24 | 中冶南方都市环保工程技术股份有限公司 | Method for preparing mine filling material using heavy metal tailings cemented by solid wastes in steel industry |
| CN114605097A (en) * | 2022-03-26 | 2022-06-10 | 中建西部建设北方有限公司 | Micro-nano bubble water tailing concrete and preparation method thereof |
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| CN111807777A (en) * | 2020-04-02 | 2020-10-23 | 陕西宏城矿业有限公司 | Novel concrete with gold mine tailing powder as full aggregate and preparation method thereof |
| CN112159166A (en) * | 2020-08-31 | 2021-01-01 | 陕西宏城矿业有限公司 | Building mortar with gold mine tailings as full aggregates and preparation method thereof |
| WO2022057104A1 (en) * | 2020-09-16 | 2022-03-24 | 中冶南方都市环保工程技术股份有限公司 | Method for preparing mine filling material using heavy metal tailings cemented by solid wastes in steel industry |
| CN113773014A (en) * | 2021-08-31 | 2021-12-10 | 中建西部建设北方有限公司 | Gold tailing concrete and preparation method thereof |
| CN114605097A (en) * | 2022-03-26 | 2022-06-10 | 中建西部建设北方有限公司 | Micro-nano bubble water tailing concrete and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117865585A (en) * | 2024-02-20 | 2024-04-12 | 长安大学 | Preparation method of sprayable color concrete with gold tailing powder as full aggregate |
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