CN113773014A - Gold tailing concrete and preparation method thereof - Google Patents
Gold tailing concrete and preparation method thereof Download PDFInfo
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- CN113773014A CN113773014A CN202111012907.6A CN202111012907A CN113773014A CN 113773014 A CN113773014 A CN 113773014A CN 202111012907 A CN202111012907 A CN 202111012907A CN 113773014 A CN113773014 A CN 113773014A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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Abstract
The application relates to the field of building materials, and particularly discloses a gold tailing concrete and a preparation method thereof. The gold tailing concrete is prepared from the following raw materials: cement, slag powder, fly ash, mixed sand, fine stone, broken stone, water and a water reducing agent; the mixed sand comprises the following components in percentage by weight: 20-30% of gold tailing sand or hydrophobically modified gold tailing sand and 70-80% of river sand; the preparation method comprises the following steps: mixing cement, slag powder, fly ash, river sand, fine stones and broken stones, and stirring to obtain a solid mixture; adding water and the rest raw materials except the gold tailings into the solid mixture, and stirring to obtain concrete slurry; and finally, adding the gold tailing sand or the hydrophobically modified gold tailing sand into the concrete slurry, and stirring to obtain the concrete. The application has the advantage of recycling the gold tailings to prepare the concrete meeting the strength requirement.
Description
Technical Field
The application relates to the field of building materials, in particular to gold tailing concrete and a preparation method thereof.
Background
With the rapid development of economy, the demand of China on gold is increasing day by day. In recent years, the gold yield of China is continuously increased, the yield is continuously increased, and the gold is gradually a great country for gold production. However, the gold content of gold mines is generally low, a large amount of gold tailings can be generated in production, the quantity of solid wastes generated in the gold dressing and metallurgy process is more than ten million tons every year, and the quantity of the wastes is increased year by year.
These solid wastes can create a number of hazards if not disposed of in time: on one hand, due to the limitation of technical conditions, most of the land is piled up, so that a large amount of land is occupied, and a large amount of agricultural and forestry land is destroyed; on the other hand, the tailings have extremely fine tailing dust and residual beneficiation reagent, the dust is easy to generate in windy weather, and the residual beneficiation reagent is easy to permeate underground to pollute underground water and the surrounding environment; in addition, the tailings are easy to flow and collapse when stockpiled, collapse and landslide are easy to cause in rainy season, and accidents are easy to occur.
The gold tailings are stacked, so that not only is resources wasted, but also a lot of harm is generated, and if the tailings can be reasonably utilized, the problem of stacking the mine tailings can be solved to a certain extent, waste is changed into valuable, and economic benefit is created.
Disclosure of Invention
In order to recycle the gold tailings, the application provides a gold tailing concrete and a preparation method thereof.
In a first aspect, the application provides a gold tailing concrete, which adopts the following technical scheme:
the gold tailing concrete is prepared from the following raw materials in parts by weight:
180 parts of 160-sand-containing cement, 70-80 parts of slag powder, 70-80 parts of fly ash, 920 parts of 900-sand-containing mixed sand, 220 parts of 200-sand-containing fine stone, 820 parts of 790-sand-containing crushed stone, 165 parts of 140-sand-containing water and 6-10.2 parts of a water reducing agent;
the mixed sand comprises the following components in percentage by weight: 20-30% of gold tailing sand or hydrophobic modified gold tailing sand and 70-80% of river sand.
Through adopting above-mentioned technical scheme, adopt gold tailings sand to constitute mixed sand in this application, because gold tailings sand granule surface is crude, and the edges and corners are clear sharp-pointed, demonstrate prism or pyramid, after the concrete solidification, between the gold tailings sand granule, in gold tailings sand granule and the concrete other solid particles "pinning", "interlock" effect can make the concrete intensity improve, and then satisfy the strength requirement.
But also because the edges and corners of the surfaces of the gold tailing sand particles are clear, the friction force among the gold tailing sand particles and between the gold tailing sand particles and other solid particles in the concrete is increased, the fineness modulus of the gold tailing sand is extremely small, the viscosity force among the particles is large, and the fluidity of the concrete is adversely affected.
The gold tailing sand is matched with the river sand with smooth and round particle surfaces, so that the friction force between the gold tailing sand particles and the river sand particles is reduced, and the influence of the gold tailing sand on the fluidity of concrete is reduced; and the content of the rough-surface particles can be controlled by controlling the mixing amount of the gold tailing sand to be 20-30% of the weight of the mixed sand, so that the friction among the rough gold tailing sand particles and between the gold tailing sand particles and river sand particles is reduced, and the influence of the gold tailing sand on the fluidity of the concrete is further reduced.
According to the method, the sand rate is controlled to be 46-48% by controlling the proportion of river sand, fine stones and broken stones, so that on one hand, the possibility that gaps among coarse aggregates are not enough to be filled due to the fact that the sand rate is too small, and further, mutual embedding and squeezing friction of coarse aggregate particles is caused is reduced, cement paste is not enough to push, and finally, the flowability is poor; on the other hand, the possibility that the sand rate is too large, the specific surface area of the aggregate is increased, a large amount of cement paste is occupied, the gaps are small, the friction surfaces among particles are enlarged, and finally the flowability is reduced. The sand rate is controlled to be 46-48%, so that the concrete meets the strength requirement and improves the fluidity of the concrete, thereby making up the influence of the gold tailings sand on the fluidity of the concrete to a certain extent.
Adopt different granularity gold tailings sand, river sand, fine stone and rubble in this application, form good gradation each other for the concrete obtains good closely knit degree, and then improves the intensity of concrete, makes its intensity requirement that satisfies the concrete.
The contact angle of the gold tailing sand and water is 0 degree, the specific surface area is large, and the water absorption capacity is strong, so that the fluidity of concrete is adversely affected. The hydrophobic membrane is arranged on the surface of the hydrophobically modified gold tailing sand, and reduces the surface hydrophilicity of the hydrophobically modified gold tailing sand particles, so that the water absorption capacity of the hydrophobically modified gold tailing sand is reduced, more water molecules can participate in flowing, and the fluidity of concrete is improved; and the hydrophobic membrane plays a role in lubricating the hydrophobic modified gold tailing sand particles to move, so that the fluidity of concrete is improved.
In conclusion, the gold tailing concrete obtained by the specific formula of the application achieves the strength required by construction while the fluidity of the concrete is not influenced.
Preferably, the hydrophobically modified gold tailings sand is prepared from the following raw materials in parts by weight: 60-80 parts of polydimethylsiloxane, 60-80 parts of tripalmitin, 2-3 parts of triethanolamine and 40-50 parts of gold tailings.
By adopting the technical scheme, polydimethylsiloxane and tripalmitin with lower surface free energy can form a hydrophobic film on the surface of the gold tailing sand particles so as to improve the surface hydrophilicity of the gold tailing sand and further improve the fluidity of concrete; and the hydrophobic membrane improves the roughness of the surface of the gold tailing sand particles and plays a role in lubricating the gold tailing sand particles in movement.
Preferably, the hydrophobically modified gold tailings sand is prepared by the following method:
s1, mixing polydimethylsiloxane and tripalmitin, heating until solid tripalmitin is hot-melted into liquid, and preparing a hydrophobic modifier;
s2, adding the gold tailings and the triethanolamine into a hydrophobic modifier, continuously heating, and stirring to obtain a solid-liquid two-phase mixture;
s3, filtering the solid-liquid two-phase mixture, putting the solid particles A obtained by filtering into water with the temperature of 5-10 ℃ for cooling, filtering again to obtain solid particles B, and drying the solid particles B to obtain the hydrophobic modified gold tailing sand.
By adopting the technical scheme, the gold tailings sand is added into the continuously heated hydrophobic modifier, so that the gold tailings sand particles are fully wrapped by the hydrophobic modifier, and under the action of the curing agent triethanolamine, after continuous heating and cooling, the hydrophobic modifier forms a hydrophobic film on the surfaces of the gold tailings sand particles, so that the hydrophobic modified gold tailings sand is obtained.
Preferably, in step S3, the parameters of the drying process for the solid particles B are: the heating temperature is 43-48 ℃, the treatment time is 90-150min, and the charging temperature is 40-42 ℃.
By adopting the technical scheme, the hydrophobic modified gold tailing sand obtained by filtering after cooling is quickly put into an oven with the oven temperature of any temperature between 40 and 42 ℃, so that the surface of a flat hydrophobic membrane can generate a nano rough structure due to sudden change of external temperature, the contact angle of the surface of the hydrophobic membrane is increased, the gold tailing sand obtains a super-hydrophobic surface, the hydrophobicity of the hydrophobic modified gold tailing sand is further improved, and the fluidity of concrete is improved.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
By adopting the technical scheme, polycarboxylic acid molecules are introduced into the concrete by doping the polycarboxylic acid water reducing agent so as to promote mutual dispersion of cement particles and release the coated water molecules, thereby greatly reducing the water consumption; and polycarboxylic acid molecules can enable the surfaces of the cement particles to have negative charges in a mode of being adsorbed on the surfaces of the cement particles, and gold tailing sand and river sand have negative charges on the surfaces, so that electrostatic repulsion is formed among the gold tailing sand, the river sand and the cement particles with the negative charges on the surfaces, and the fluidity of concrete is improved.
Preferably, the concrete further comprises 2-3 parts by weight of sodium dodecyl benzene sulfonate.
By adopting the technical scheme, the sodium dodecyl benzene sulfonate is used as an air entraining agent to be doped into the concrete, and air bubbles with good structure and small radius are introduced into the concrete, so that the fluidity of the concrete is improved.
Preferably, the cement is P.O 42.5.5 ordinary portland cement, the slag powder is S95-grade granulated blast furnace slag powder, and the fly ash is II-grade fly ash.
By adopting the technical scheme, the S95-grade granulated blast furnace slag powder has higher activity, can improve the later strength of heavy concrete, has good filling effect with the S95-grade granulated blast furnace slag powder and the II-grade fly ash, and can fill fine gaps in cement, thereby improving the compactness of the concrete, further improving the strength of the concrete and enabling the concrete to meet the strength requirement.
Preferably, the fineness modulus of the river sand is 2.3-3.0, and the fineness modulus of the gold tailings sand is 0.5-1.5.
By adopting the technical scheme, the middlings with moderate fineness modulus are selected for the river sand and are matched with the gold tailing sand, so that the contact between round river sand particles and rough gold tailing sand particles is increased, and the contact between the rough gold tailing sand particles is reduced, so that the friction force among the particles is reduced, and the flowability of concrete is improved; and good gradation is formed between the river sand and the gold tailing sand, so that the strength of the concrete is improved.
Preferably, the fine stones are 5-10mm continuous graded fine stones, and the broken stones are 5-31.5mm continuous graded broken stones.
Through adopting above-mentioned technical scheme, fine stone forms good gradation with the rubble for space between the thick granule, the gap between the medium granule are filled by medium granule, fine granule respectively, so fill step by step and make the void ratio between the concrete granule reduce, and bulk density increases, and then promotes the intensity of concrete, reaches the purpose of practicing thrift cement simultaneously.
In a second aspect, the application provides a preparation method of gold tailing concrete, which adopts the following technical scheme:
a preparation method of gold tailing concrete comprises the following steps:
preparation of a solid mixture: mixing cement, slag powder, fly ash, river sand, fine stones and broken stones, and stirring to obtain a solid mixture;
preparing concrete slurry: adding the rest raw materials except the gold tailing sand or the hydrophobically modified gold tailing sand into the solid mixture, and stirring to obtain concrete slurry;
preparing concrete: and adding the gold tailing sand or the hydrophobically modified gold tailing sand into the concrete slurry, and stirring to obtain the concrete.
By adopting the technical scheme, the preparation of the concrete slurry is carried out firstly, so that the hydration heat of the cement is fully released, the concrete slurry is continuously stirred, and the gold tailing sand/hydrophobic modified gold tailing sand is added, so that the possibility of poor concrete mixing caused by water adsorbed on the surface of the gold tailing sand can be reduced; meanwhile, the hydrophobic modified gold tailing sand is added, so that the hydrophobic membrane on the surface of the hydrophobic modified gold tailing sand particles can be prevented from being damaged by high temperature generated by heat release of hydration heat, and the influence of the hydration heat on the effect of the hydrophobic membrane is reduced.
In summary, the present application has the following beneficial effects:
1. because the mixed sand formed by matching the gold tailing sand and the river sand is adopted, the fluidity of the concrete is not influenced, and the requirement of construction on the strength of the concrete is met;
2. the hydrophobic modified gold tailing sand is preferably adopted in the application, so that the water absorption of the gold tailing sand is reduced, the roughness of the particle surface of the gold tailing sand is reduced, and the friction force among particles is reduced, so that the influence on the fluidity of concrete is reduced;
3. according to the method, the possibility of poor concrete mixing caused by water adsorbed on the surface of the gold tailings sand can be reduced by adding the gold tailings sand/the hydrophobically modified gold tailings sand finally; meanwhile, the hydrophobic membrane on the surface of the hydrophobically modified gold tailing sand particles is prevented from being damaged by high temperature generated by heat release of hydration heat, and the influence of the hydration heat on the effect of the hydrophobic membrane is reduced.
Detailed Description
The present application is further described in detail with reference to the following examples, which are specifically illustrated by the following: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples are available from ordinary commercial sources unless otherwise specified.
In the application, P.O 42.5.5 ordinary portland cement is selected as the cement, and can be purchased from Nippon lake conch cement Limited liability company;
the polycarboxylate water reducer is available from Shandong Xima supply chain management, Inc.;
the slag powder is S95-grade granulated blast furnace slag powder which can be purchased from Huashuo mineral processing factories in Lingshou county;
the II-grade fly ash is purchased from a processing plant of Yumei mineral products in Lingshou county;
the naphthalene series high-efficiency water reducing agent can be purchased from Shanghai Yunji New Material science and technology Limited and has the model of FDN-C;
river sand can be purchased from mineral processing factories of Kunzze in Lingshu county, and the specification is 40-80 meshes;
the fine stone is 5-10mm continuous graded fine stone, the broken stone is 5-31.5mm continuous graded broken stone, and the fine stone and the broken stone are obtained by crushing, shaping and screening the rock;
the fineness modulus of the sandstone is 2.3-2.8, the fineness modulus of the stone chips is 2.3-3.0, and the sandstone and the stone chips are obtained by crushing, shaping and screening rocks;
tripalmitin is available from Shanghai Merlin Biotech;
the gold tailing sand is obtained by crushing, shaping and screening gold tailings.
Preparation example of hydrophobically modified gold tailings sand
Preparation example 1
A preparation method of hydrophobically modified gold tailings sand comprises the following steps:
s1, mixing 70kg of polydimethylsiloxane and 70kg of tripalmitin, and heating to 80 ℃ to obtain a hydrophobic modifier;
s2, adding 45kg of gold tailings sand and 2.5kg of triethanolamine into a continuously heated hydrophobic modifier, stirring to form a solid-liquid two-phase mixture, and heating the solid-liquid two-phase mixture for 15min at the temperature of 80 ℃;
s3, filtering the solid-liquid two-phase mixture, putting the filtered solid particles A into water at 8 ℃ rapidly for cooling, and filtering again to obtain solid particles B;
and S4, rapidly putting the solid particles B into an oven with the oven temperature of 41 ℃, carrying out heating treatment on the solid particles B at the temperature of 45 ℃, and carrying out heat treatment for 120min to obtain the hydrophobic modified gold tailing sand.
Preparation example 2
A preparation method of hydrophobically modified gold tailings sand comprises the following steps:
s1, mixing 60kg of polydimethylsiloxane and 60kg of tripalmitin, and heating to 80 ℃ to obtain a hydrophobic modifier;
s2, adding 40kg of gold tailings sand and 2kg of triethanolamine into a continuously heated hydrophobic modifier, stirring to form a solid-liquid two-phase mixture, and heating the solid-liquid two-phase mixture for 15min at the temperature of 80 ℃;
s3, filtering the solid-liquid two-phase mixture, putting the filtered solid particles A into water at 5 ℃ rapidly for cooling, and filtering again to obtain solid particles B;
and S4, rapidly putting the solid particles B into an oven with the oven temperature of 40 ℃, carrying out heating treatment on the solid particles B at the temperature of 43 ℃, and carrying out heat treatment for 150min to obtain the hydrophobic modified gold tailing sand.
Preparation example 3
A preparation method of hydrophobically modified gold tailings sand comprises the following steps:
s1, mixing 80kg of polydimethylsiloxane and 80kg of tripalmitin, and heating to 80 ℃ to prepare a hydrophobic modifier;
s2, adding 50kg of gold tailings sand and 3kg of triethanolamine into a continuously heated hydrophobic modifier, stirring to form a solid-liquid two-phase mixture, and heating the solid-liquid two-phase mixture for 15min at the temperature of 80 ℃;
s3, filtering the solid-liquid two-phase mixture, putting the filtered solid particles A into water at 10 ℃ rapidly for cooling, and filtering again to obtain solid particles B;
and S4, rapidly putting the solid particles B into an oven with the oven temperature of 42 ℃, carrying out heating treatment on the solid particles B at the temperature of 48 ℃, and carrying out heat treatment for 90min to obtain the hydrophobic modified gold tailing sand.
Preparation example 4
A preparation method of hydrophobically modified gold tailings sand is carried out according to the method in preparation example 1, except that tripalmitin is replaced by polydimethylsiloxane in equal amount.
Preparation example 5
A preparation method of hydrophobically modified gold tailings sand is carried out according to the method in preparation example 1, except that polydimethylsiloxane is equivalently replaced by tripalmitin.
Preparation example 6
S1, mixing 70kg of polydimethylsiloxane and 70kg of tripalmitin, and heating to 80 ℃ to obtain a hydrophobic modifier;
s2, adding 45kg of gold tailings sand into a continuously heated hydrophobic modifier, stirring to form a solid-liquid two-phase mixture, and heating the solid-liquid two-phase mixture for 15min at the temperature of 80 ℃;
s3, filtering the solid-liquid two-phase mixture, putting the filtered solid particles A into water at 8 ℃ rapidly for cooling, and filtering again to obtain solid particles B;
s4, airing the solid particles B at normal temperature to obtain the hydrophobic modified gold tailing sand.
Examples
Example 1
A preparation method of concrete comprises the following steps: mixing 170kg of cement, 70kg of slag powder, 80kg of fly ash, 690kg of river sand, 210kg of fine stone, 810kg of broken stone and 50kg of granulated blast furnace slag powder, and stirring to obtain a solid mixture; adding 155kg of water, 8kg of polycarboxylic acid water reducing agent and 2.5kg of sodium dodecyl benzene sulfonate into the solid mixture, and stirring to obtain concrete slurry; finally, 230kg of gold tailing sand is added into the concrete slurry, and the concrete is obtained by stirring.
Example 2
A preparation method of concrete comprises the following steps: mixing 160kg of cement, 70kg of slag powder, 70kg of fly ash, 630kg of river sand, 200kg of fine stone, 790kg of gravel and 40kg of granulated blast furnace slag powder, and stirring to obtain a solid mixture; then adding 140kg of water, 6kg of polycarboxylic acid water reducing agent and 2kg of sodium dodecyl benzene sulfonate into the solid mixture, and stirring to obtain concrete slurry; and finally, adding 180kg of gold tailing sand into the concrete slurry, and stirring to obtain the concrete.
Example 3
A preparation method of concrete comprises the following steps: mixing 180kg of cement, 80kg of slag powder, 80kg of fly ash, 660kg of river sand, 220kg of fine stone, 820kg of broken stone and 60kg of granulated blast furnace slag powder, and stirring to obtain a solid mixture; then adding 165kg of water, 10.2kg of polycarboxylic acid water reducing agent and 3kg of sodium dodecyl benzene sulfonate into the solid mixture, and stirring to obtain concrete slurry; and finally, adding 280kg of gold tailing sand into the concrete slurry, and stirring to obtain the concrete.
Example 4
A preparation method of gold tailing concrete is carried out according to the method in the embodiment 1, and the difference is that gold tailing sand is replaced by hydrophobic modified gold tailing sand prepared in the preparation example 1 in an equal amount.
Example 5
A preparation method of gold tailing concrete is carried out according to the method in the embodiment 2, and the difference is that gold tailing sand is replaced by hydrophobic modified gold tailing sand prepared in the preparation embodiment 2 in an equal amount.
Example 6
A preparation method of gold tailing concrete, which is carried out according to the method in the embodiment 3, and is characterized in that gold tailing sand is replaced by hydrophobic modified gold tailing sand prepared in the preparation embodiment 3 in an equal amount.
Example 7
A preparation method of gold tailing concrete is carried out according to the method in the embodiment 1, and the difference is that gold tailing sand is replaced by hydrophobic modified gold tailing sand prepared in the preparation example 4 in an equal amount.
Example 8
A preparation method of gold tailing concrete is carried out according to the method in the embodiment 1, and the difference is that gold tailing sand is replaced by hydrophobic modified gold tailing sand prepared in the preparation example 5 in an equal amount.
Example 9
A preparation method of gold tailing concrete is carried out according to the method in the embodiment 1, and the difference is that gold tailing sand is replaced by hydrophobic modified gold tailing sand prepared in the preparation example 6 in an equal amount.
Example 10
A concrete preparation method was carried out in the same manner as in example 4, except that the polycarboxylic acid water-reducing agent was replaced with a naphthalene based superplasticizer in an equivalent amount.
Comparative example
Comparative example 1
A preparation method of concrete comprises the following steps: mixing 170kg of cement, 70kg of slag powder, 80kg of fly ash, 515kg of river sand, 200kg of fine stone, 800kg of broken stone and 400kg of stone chips, and stirring to obtain a solid mixture; then 160kg of water and 7.7kg of polycarboxylic acid water reducing agent are added into the solid mixture, and the mixture is stirred to obtain the concrete.
Comparative example 2
The concrete preparation method is carried out according to the method in the embodiment 4, and the difference is that the hydrophobic modified gold tailing sand is added in 15 weight parts of the mixed sand, the river sand is added in 85 weight parts of the mixed sand, namely the hydrophobic modified gold tailing sand is added in 140kg, and the river sand is added in 780 kg.
Comparative example 3
The preparation method of the concrete is carried out according to the method in the embodiment 4, and the difference is that the hydrophobic modified gold tailing sand is added in an amount of 40 parts by weight of the mixed sand, the river sand is added in an amount of 60 parts by weight of the mixed sand, namely the hydrophobic modified gold tailing sand is added in an amount of 370kg, and the river sand is added in an amount of 550 kg.
Comparative example 4
A concrete was prepared by following the procedure of example 4 except that the river sand was replaced with sandstone in equal amount.
Comparative example 5
A concrete preparation method was carried out in the same manner as in example 4, except that the hydrophobically modified gold tailings sand was replaced with river sand in equal amounts.
Performance test
The concrete obtained in the above examples and comparative examples was subjected to the test of compressive strength by the test method in the GB/T50081 standard and the measurement of slump and slump spread, and the test results are shown in Table 1.
Table 1:
| detecting items | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 |
| 7d Strength (MPa) | 37.8 | 36.8 | 35.1 | 37.3 | 36.9 | 36.5 | 37.5 | 36.6 |
| Slump (mm) | 215 | 210 | 210 | 235 | 230 | 230 | 225 | 220 |
| Slump of 2h (mm) | 215 | 210 | 210 | 230 | 230 | 230 | 225 | 220 |
| Slump spread (mm) | 650 | 650 | 650 | 680 | 680 | 680 | 680 | 670 |
| 2h slump expansion degree (mm） | 650 | 650 | 640 | 680 | 680 | 680 | 670 | 660 |
| Detecting items | Example 9 | Example 10 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | - |
| 7d Strength (MPa) | 37.7 | 36.4 | 31.0 | 26.5 | 27.8 | 29.3 | 25.2 | - |
| Slump (mm) | 220 | 220 | 215 | 200 | 190 | 175 | 195 | - |
| Slump of 2h (mm) | 220 | 220 | 215 | 200 | 190 | 175 | 195 | - |
| Slump spread (mm) | 660 | 660 | 650 | 630 | 610 | 600 | 620 | - |
| Slump expansion degree (mm) | 650 | 660 | 640 | 630 | 610 | 600 | 620 | - |
As can be seen by combining the data of example 1, example 4 and comparative examples 1 to 3 in table 1, the concrete prepared by adding the gold tailings sand in example 1 and the concrete prepared by adding the hydrophobically modified gold tailings sand in example 4 have no decrease in slump, slump expansion and compressive strength compared with the common C30 concrete in comparative example 1, and the compressive strength is better than that of the common C30 concrete in comparative example 1;
compared with the embodiment 4 and the comparative example 1, the compressive strength of the concrete in the comparative example 2 is obviously reduced, probably because the mixing amount of the gold tailings sand is too low, and the river sand with a smooth surface in the mixed sand has too many particles and rough surfaces, so that the pinning and occlusion effects among the particles are reduced, and the particles with small fineness modulus are reduced, so that the gaps among the coarse particles cannot be well filled, the compactness of the concrete is reduced, and the compressive strength is reduced;
compared with the embodiment 4 and the comparative example 1, the concrete in the comparative example 3 has obviously reduced fluidity and compressive strength, probably because the gold tailings sand in the comparative example 3 has larger mixing amount and larger proportion of coarse particles, the interparticle friction is increased, and then the concrete fluidity is influenced, and the contact angle between the surface of the gold tailings sand and water is 0 degree, so that the gold tailings sand has stronger water absorption capacity, the concrete mixing is influenced, and the friction force between the coarse particles is larger, so that the gold tailings sand cannot be well dispersed to gaps among larger particles, the concrete compactness is reduced, and the compressive strength of the concrete is influenced.
In conclusion, the concrete prepared by adding the hydrophobic modified gold tailing sand in the range can change the gold tailings into valuables and prepare the concrete with better fluidity and compressive strength.
The data in table 1 of example 4 and comparative examples 4-5 are combined to find that the concrete prepared by matching the gold tailings sand and the sandstone in comparative example 4 has much better fluidity and compressive strength than the concrete prepared by matching the hydrophobically modified gold tailings sand and the river sand in example 4 in the same weight part, which indicates that the matching of the hydrophobically modified gold tailings sand and the river sand can better reduce the influence of the hydrophobically modified gold tailings sand on the concrete; the concrete strength of the concrete prepared by equivalently replacing the hydrophobically modified gold tailings sand with the river sand in the comparative example 5 is obviously reduced, which shows that the concrete strength can be improved by the cooperation of the hydrophobically modified gold tailings sand and the river sand, and further the concrete prepared by the cooperation of the hydrophobically modified gold tailings sand and the river sand meets the strength requirement.
The data in table 1 of example 4 and examples 7-8 show that the concrete in example 4 is better than that in example 7 and example 8, probably because the polydimethylsiloxane and the tripalmitin are compounded, a hydrophobic film can be more effectively formed on the surface of the gold tailing sand particles, so that the hydrophilicity of the hydrophobically modified gold tailing sand particles is reduced, the roughness of the hydrophobically modified gold tailing sand particles is improved, and the fluidity of the concrete is improved.
By combining the data of example 4 and example 9 in table 1, it can be found that the fluidity of the concrete in example 4 is much higher than that of example 9, and probably because the hydrophobic membrane on the surface of the hydrophobic modified gold tailing sand particles is subjected to heat treatment, the surface of the hydrophobic membrane has more nano coarse structures, so that the hydrophobic modified gold tailing sand obtained after the heat treatment has better hydrophobicity, and the concrete prepared from the hydrophobic modified gold tailing sand obtained after the heat treatment has higher fluidity.
By comparing the data in table 1 of example 4 and example 10, the concrete in example 10 is found to have lower fluidity than the concrete in example 4, which shows that the polycarboxylic acid water reducing agent is used as the water reducing agent to be mixed into the concrete to more effectively improve the fluidity of the gold tailing concrete compared with the naphthalene high-efficiency water reducing agent.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The gold tailing concrete is characterized by being prepared from the following raw materials in parts by weight:
180 parts of 160-sand-containing cement, 70-80 parts of slag powder, 70-80 parts of fly ash, 920 parts of 900-sand-containing mixed sand, 220 parts of 200-sand-containing fine stone, 820 parts of 790-sand-containing crushed stone, 165 parts of 140-sand-containing water and 6-10.2 parts of a water reducing agent;
the mixed sand comprises the following components in percentage by weight: 20-30% of gold tailing sand or hydrophobic modified gold tailing sand and 70-80% of river sand.
2. The gold tailing concrete according to claim 1, which is characterized in that: the hydrophobic modified gold tailing sand is prepared from the following raw materials in parts by weight: 60-80 parts of polydimethylsiloxane, 60-80 parts of tripalmitin, 2-3 parts of triethanolamine and 40-50 parts of gold tailings.
3. The gold tailing concrete according to claim 2, which is characterized in that: the hydrophobic modified gold tailing sand is prepared by the following method:
s1, mixing polydimethylsiloxane and tripalmitin, heating until solid tripalmitin is hot-melted into liquid, and preparing a hydrophobic modifier;
s2, adding the gold tailings and the triethanolamine into a hydrophobic modifier, continuously heating, and stirring to obtain a solid-liquid two-phase mixture;
s3, filtering the solid-liquid two-phase mixture, putting the solid particles A obtained by filtering into water with the temperature of 5-10 ℃ for cooling, filtering again to obtain solid particles B, and drying the solid particles B to obtain the hydrophobic modified gold tailing sand.
4. The gold tailing concrete according to claim 3, which is characterized in that: in step S3, the parameters of the drying process for the solid particles B are: the heating temperature is 43-48 ℃, the treatment time is 90-150min, and the charging temperature is 40-42 ℃.
5. The gold tailing concrete according to claim 1, which is characterized in that: the water reducing agent is a polycarboxylic acid water reducing agent.
6. The gold tailing concrete according to claim 1, which is characterized in that: the concrete also comprises 2-3 parts of sodium dodecyl benzene sulfonate.
7. The gold tailing concrete according to claim 1, which is characterized in that: the cement is P.O 42.5.5 ordinary portland cement, the slag powder is S95-grade granulated blast furnace slag powder, and the fly ash is II-grade fly ash.
8. The gold tailing concrete according to claim 1, which is characterized in that: the fineness modulus of the river sand is 2.3-3.0, and the fineness modulus of the gold tailing sand is 0.5-1.5.
9. The gold tailing concrete according to claim 1, which is characterized in that: the fine stone is 5-10mm continuous graded fine stone, and the broken stone is 5-31.5mm continuous graded broken stone.
10. The method for preparing the gold tailing concrete according to any one of claims 1 to 9, which is characterized by comprising the following steps:
preparation of a solid mixture: mixing cement, slag powder, fly ash, river sand, fine stones and broken stones, and stirring to obtain a solid mixture;
preparing concrete slurry: adding the rest raw materials except the gold tailing sand or the hydrophobically modified gold tailing sand into the solid mixture, and stirring to obtain concrete slurry;
preparing concrete: and adding the gold tailing sand or the hydrophobically modified gold tailing sand into the concrete slurry, and stirring to obtain the concrete.
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| CN115159908A (en) * | 2022-07-28 | 2022-10-11 | 中铁十八局集团有限公司 | Wet-sprayed concrete taking gold tailings as aggregate and preparation method thereof |
| CN115304329A (en) * | 2022-08-16 | 2022-11-08 | 中建西部建设北方有限公司 | Efficient slow-setting and water-reducing gold tailing concrete and preparation method thereof |
| CN115321905A (en) * | 2022-08-05 | 2022-11-11 | 中建西部建设北方有限公司 | High-strength gold tailing concrete and preparation method thereof |
| CN116535186A (en) * | 2023-07-07 | 2023-08-04 | 矿冶科技集团有限公司 | Non-sintered water permeable material of full solid waste recycled aggregate and preparation method thereof |
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