CN111848073A - Lime de-iron copper tailing stabilized sea sand semi-rigid base layer and preparation method thereof - Google Patents
Lime de-iron copper tailing stabilized sea sand semi-rigid base layer and preparation method thereof Download PDFInfo
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- CN111848073A CN111848073A CN202010702331.5A CN202010702331A CN111848073A CN 111848073 A CN111848073 A CN 111848073A CN 202010702331 A CN202010702331 A CN 202010702331A CN 111848073 A CN111848073 A CN 111848073A
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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
- C04B28/10—Lime cements or magnesium oxide 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
- 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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- 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 belongs to the technical field of building materials, and particularly discloses a lime de-ironing copper tailing stabilized sea sand semi-rigid base layer which comprises the following components in percentage by mass, which are uniformly mixed: 75.5 to 89.5 percent of desalted sea sand, 7.5 to 17.5 percent of iron-copper extraction tailings and 3 to 7 percent of lime. The invention also discloses a preparation method of the stable sea sand mixture of the lime deironing copper tailings. The lime de-iron copper tailing stabilized sea sand semi-rigid base layer prepared by the invention has the characteristics of convenience in material obtaining, energy conservation and environmental protection, and is a novel building material; the material can utilize a large amount of copper tailings and sea sand, can solve the problems of environmental protection and land occupation caused by the copper tailings, and relieves increasingly deficient mineral admixture and sand resources, and has important economic significance and environmental protection significance. The unconfined compressive strength of the semi-rigid sea sand base layer stabilized by the lime deironing copper tailings prepared by the method meets the standard requirement, the manufacturing cost of the semi-rigid base layer can be greatly reduced, and the production cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a semi-rigid sea sand base layer stabilized by copper tailings removed by lime and a preparation method thereof.
Background
The sand is called as concrete fine aggregate and is a necessary material for construction projects; the river sand salvage for building aggregate production is a traditional mode in China, the river sand often has a large mud content, and the river sand needs to be washed, selected and dried to be applied to dry powder mortar; today, the demand for sandstone aggregates is naturally and continuously increasing in China's economy continuously flying; river sand cannot meet the building requirements of rapid development in China. Every year, the infrastructure construction of China needs hundreds of millions of tons of sand, so that the 'white hanging of a green mountain and yellow river water' are caused, the ecological environment of China is seriously influenced, and in order to protect the environment and limited sand resources, in addition to the purposes of improving the price of the sand and limiting the production amount of the sand, other materials are urgently needed to replace the sand resources.
In coastal areas of China, hundreds of millions of tons of sea sand exist, and the sea sand is sand in the sea as the name suggests. The larger particle size is sand, generally in units of centimeters; the sand with smaller grain diameter is usually in millimeter unit, and both are pure natural and are made by seawater scouring, rolling, colliding and grinding. The sea sand contains silicon dioxide, small amount of chloride ions, feldspar, calcium, magnesium, mica and the like, is used as the second ocean mineral product next to petroleum and natural gas, has a plurality of purposes, and one of the most main purposes is used as a raw material for engineering construction, particularly a sea filling and land building link of large-scale construction. In the application of building materials, because the sea sand contains relatively high salt, chloride ions in the salt can erode reinforcing steel bars, which brings potential safety hazards to engineering, and therefore, the application of the sea sand is limited. In 2004, 8 months, the national ministry of construction produced "opinions about strict management of sea sand for construction", in which provision was made: sea sand adopted in construction engineering must be subjected to special desalting treatment, and if the sea sand is used in reinforced concrete, the chloride ion content of the sea sand should not be more than six parts per million.
Sea sand is abundant in resource, low in price and easy to obtain, so that the raw material prospect is put on the sea sand in many building fields. If the sea sand can be used for replacing the sand, the pressure of the shortage of sand resources can be effectively relieved, the construction cost can be greatly reduced, and the method has important economic significance and environmental protection significance. The sea sand is also related to reports in the aspect of utilization in the field of buildings, relevant patent documents such as Chinese patent with the patent number ZL201510100658.4 are retrieved, and a method for preparing the sea sand into a high-strength building material by wet-type burning is disclosed, wherein the method comprises the steps of stirring and uniformly mixing the sea sand and slaked lime, adding seawater, mixing, and performing compression molding to obtain a building material section green body; demoulding the green body and then carrying out wet-type firing to obtain a building material profile product; the product obtained by the method can be used for road paving, building materials, island construction and the like. However, the sea sand used in the technical scheme of adopting the sea sand to prepare the sintering material is sand which is directly mined by seaside and is corroded by seawater without being desalted, the content of chloride ions is high, and the application range of the sea sand is limited.
Copper tailings, also called copper tailings, are composed of fine sand particles left after the ore is crushed and refined. Most of the copper tailings in China have low grade and need to be crushed, ground, sorted and the like The copper-containing concentrate separated in the procedure can be smelted, a large amount of tailings can be discharged in the ore dressing process, and the ore grade is reduced along with the improvement of the utilization degree of mineral resources, so that the discharge amount of the tailings is increased greatly. The large amount of produced copper tailings causes great harm to the ecological environment, and occupies a large amount of land: the tailings are directly treated in a stockpiling mode, so that a large amount of farmlands which can be reclaimed are occupied, and the waste of large land resources is caused; tailings cause various types of environmental pollution. Hundreds of millions of tons of copper tailings are stacked in the open air in China, only part of copper tailings are used for making bricks, paving and cement mixing materials at present, but the utilization rate is low, and the added value of products is low; the copper tailings are narrow in application range, so that a large amount of copper tailings are often treated as waste, the economic cost of treatment is high in the treatment process, and great waste is caused; therefore, it is highly desirable to improve the utilization rate and the utilization value thereof. The demand of fly ash in China reaches hundreds of millions of cubes, so that the price of fly ash reaches 120 yuan/m3The chemical components of the copper tailings are similar to those of the fly ash, and if the copper tailings can replace the fly ash through treatment, the method is an effective way for large-scale and high-value utilization of the copper tailings.
In conclusion, in the building engineering, if the river sand can be replaced by the sea sand, the copper tailings are used for replacing the fly ash, so that the method has important economic significance and environmental protection significance. Therefore, how to treat the copper tailings to replace fly ash and adopt sea sand to replace river sand becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a stable sea sand semi-rigid base course of lime de-ironing copper tailings and a preparation method thereof aiming at the problems in the prior art. The semi-rigid base layer is prepared by adopting iron-removed copper tailing solid waste and sea sand as main raw materials, can solve the problems of environmental protection, land occupation and the like of the copper tailings, relieves river sand resources which are increasingly in shortage, stabilizes the river sand market and expands the application range of the copper tailings and the sea sand. The unconfined compressive strength of the semi-rigid base layer prepared by the method meets the standard requirement, the manufacturing cost of the semi-rigid base layer can be greatly reduced, and the production cost is greatly reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the lime de-iron copper tailing stabilized sea sand semi-rigid base layer comprises the following components in percentage by mass, which are uniformly mixed:
Sea sand 75.5% -89.5%;
7.5 to 17.5 percent of iron-removed copper tailings;
3 to 7 percent of lime.
The lime de-ironing copper tailings stabilize a semi-rigid sea sand base layer, and the sea sand is obtained by removing shells from the sea sand, washing with water and drying.
Furthermore, the sea sand comprises 40-60% of superfine sand with the grain diameter of 0.075-2.36 mm and 40-60% of rice sand with the grain diameter of 2.36-5 mm.
The lime de-ironing copper tailings stabilize the semi-rigid sea sand base layer, and the de-ironing copper tailings are made of copper tailings (Fe)2O3The content of SiO reaches more than 20 percent2、Al2O3The total content is close to 50 percent), the tailings of the iron powder with the iron content of more than 80 percent can be obtained after the treatment of a rotary hearth furnace, and the tailings are obtained by drying, grinding and sieving through a negative pressure sieve of 45 mu m.
The lime iron-removing copper tailings stabilized sea sand semi-rigid base layer is calcium slaked lime, and the density is as follows: 1.3 to 1.4g/cm3The effective CaO + MgO content is not less than 60%, the weight water content is less than 5%, and the slaked lime passes through a 0.6 mm square-hole sieve during the test.
Furthermore, the 7d unconfined compressive strength of the lime de-ironing copper tailings stabilized sea sand semi-rigid base layer is not lower than 1.61Mpa, and the manufacturing cost is 63.3-90.3 yuan/m 3。
The invention also aims to provide a preparation method of the lime de-iron copper tailing stabilized sea sand semi-rigid base layer, which is obtained by uniformly mixing the following components in percentage by mass:
sea sand 75.5% -89.5%;
7.5 to 17.5 percent of iron-removed copper tailings;
3 to 7 percent of lime.
Further, the preparation method comprises the steps of adding water into the lime iron-removing copper tailing stabilized sea sand semi-rigid base layer prepared by uniformly mixing the components, and mixing; wherein the addition amount of water is 5.1-7.4% of the mass of the semi-rigid base layer of the sea sand stabilized by the lime de-ironing copper tailings.
The invention has the beneficial effects that:
(1) the invention discovers that: sea sand is subjected to shell removal, water washing and drying treatment to replace natural sand resources in the prior art, so that the pressure of resource shortage of natural sand can be effectively relieved, the material price is greatly reduced, the natural environment is protected, and the method is one of effective measures for ensuring the sustainable development of the society.
(2) The invention discovers that: deironing the copper tailings by a rotary hearth furnace, grinding for 45 min, and sieving by a negative pressure sieve of 45 mu m to obtain deironing copper tailings powder, wherein the volcanic ash activity of the obtained deironing copper tailings is superior to that of second-level fly ash; therefore, the invention utilizes the iron-removing copper tailings to replace mineral admixture (such as fly ash) in the prior art, can solve the problems of occupying land by the copper tailings, polluting environment, improving the utilization value of the copper tailings and relieving the current situation of mineral admixture shortage.
(3) The lime de-iron copper tailing stabilized sea sand semi-rigid base layer has the characteristics of convenience in material obtaining, energy conservation and environmental protection, and is a novel building material; the material can utilize a large amount of copper tailings and sea sand, can solve the problems of environmental protection and land occupation caused by the copper tailings, relieves mineral admixture and sand resources which are increasingly in shortage, and enlarges the application range of deironing the copper tailings and the sea sand.
(4) Practical engineering proves that the unconfined compressive strength of the lime deironing copper tailing stabilized sea sand semi-rigid base layer prepared by the method meets the standard requirement, the cost of the unlimited compressive strength does not exceed 50.8 percent of that of a secondary lime base layer with the same proportion, and the production cost is greatly reduced.
Detailed Description
The invention relates to a lime de-ironing copper tailing stabilized sea sand semi-rigid base layer, which comprises the following components in percentage by mass, which are uniformly mixed:
sea sand 75.5% -89.5%;
7.5 to 21 percent of iron and copper removing tailings;
3 to 7 percent of lime.
Specifically, the sea sand is obtained by removing shellfish from sea sand, washing with water, and drying, and has the composition shown in table 1.
It should be noted that, when determining the specific composition of the sea sand, the optimal ratio is specifically selected according to the molding method (compaction or vibration) test of the finally obtained lime de-ironing copper tailings stabilized sea sand semi-rigid base layer and the requirement of unconfined compressive strength.
More specifically, the iron-removing copper tailings are made of copper tailings (Fe)2O3The content of SiO reaches more than 20 percent2、Al2O3The total content is close to 50 percent), the tailings of the iron powder with the iron content of more than 80 percent can be obtained after the treatment of a rotary hearth furnace, and the tailings are obtained by drying, grinding and sieving through a negative pressure sieve of 45 mu m. The lime is calcareous slaked lime, and the density is as follows: 1.3 to 1.4g/cm3The effective CaO + MgO content is not less than 60%, the weight water content is less than 5%, and the slaked lime passes through a 0.6 mm square-hole sieve during the test.
The seven-day unconfined compressive strength of the semi-rigid sea sand base layer stabilized by the lime deironing copper tailings provided by the invention is at least 1.61 MPa; it meets the requirements of highway use functions.
The preparation method of the semi-rigid base layer of the stabilized sea sand of the lime de-iron copper tailings, disclosed by the invention, has the advantages of simple process and easiness in preparation, and comprises the following components in percentage by mass: sea sand 75.5% -89.5%; 7.5 to 17.5 percent of iron-removed copper tailings and 3 to 7 percent of lime; uniformly mixing to obtain: further, the preparation method comprises the steps of adding water into the lime iron-removing copper tailing stabilized sea sand semi-rigid base layer prepared by uniformly mixing the components, and mixing; wherein the addition amount of water is 5.1-7.4% of the mass of the semi-rigid base layer of the sea sand stabilized by the lime de-ironing copper tailings.
The above-mentioned stabilized sea sand semi-rigid base layer with lime removed copper tailings and the preparation method and application properties thereof will be illustrated by the following specific examples, but those skilled in the art will understand that the following examples are only specific examples of the present invention, and are not intended to limit the overall technical scope thereof. The embodiments are provided to explain the principles of the invention and its practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.
Example 1
First, sea sand was produced as follows.
Specifically, the purchased sea sand is piled up intensively; sequentially removing shells, screening, washing and drying the intensively stacked sea sand to obtain sea sand with a required particle size range; the obtained sea sand was passed through the following mesh openings in the mass percentages shown in table 2.
The results of the screening in table 2 above were mixed in a mass ratio of 50% ultrafine sand (particle size 0.075 mm to 2.36 mm) and 50% rice sand (particle size 2.36 mm to 5 mm) to obtain sea sand.
Then, copper tailings (Fe) are used2O3Content of more than 20%) is processed by a rotary hearth furnace to obtain tailings of iron powder with iron content of more than 80%, and the tailings are dried, ground and sieved by a 45-micron negative pressure sieve to obtain the iron-removed copper tailings meeting the indexes listed in table 3.
Lime is adopted as calcareous slaked lime, and the density is as follows: 1.3 to 1.4g/cm3The effective CaO + MgO content is not less than 60%, the weight water content is less than 5%, and the slaked lime passes through a 0.6 mm square-hole sieve during the test.
And finally, mixing the lime, the deironing copper tailings and the sea sand according to the mass percentage ratio of 3% to 7.5% to 89.5% to obtain the semi-rigid base layer of the lime deironing copper tailings stabilized sea sand.
In order to verify the service performance of the prepared lime de-ironing copper tailing stabilized sea sand semi-rigid base layer, tap water with the mass being 5.1% of that of the lime de-ironing copper tailing stabilized sea sand semi-rigid base layer is added into the base layer through the maximum dry density and the optimal water content determined by a vibration test for mixing, and the unconfined compressive strength of the base layer in the 7 d age is measured to be 1.61 MPa.
Example 2
In the process steps of embodiment 2, the same points as those of embodiment 1 are not repeated herein, and only the differences from embodiment 1 are described. The difference between the embodiment 2 and the embodiment 1 is that the semi-rigid base layer of the lime deironing copper tailings stabilized sea sand of the embodiment can be obtained by mixing the components of lime, deironing copper tailings and sea sand according to the mass percentage of 4% to 10% to 86%; otherwise as described in example 1.
The service performance of the lime de-ironing copper tailing stabilized sea sand semi-rigid base layer of the embodiment is measured by the same measuring method as that in the embodiment 1. And adding tap water with the mass of 5.6% of the mass of the semi-rigid base layer of the lime de-ironing copper tailings stabilized sea sand into the mixture according to the maximum dry density and the optimal water content determined by a vibration test, and stirring the mixture to obtain the unconfined compressive strength of 7d of the mixture of 1.74 MPa.
Example 3
In the process steps of embodiment 3, the same points as those of embodiment 1 are not repeated herein, and only the differences from embodiment 1 are described. The difference between the embodiment 2 and the embodiment 1 is that the semi-rigid base layer of the lime deironing copper tailings stabilized sea sand of the embodiment can be obtained by mixing the lime, the deironing copper tailings and the sea sand according to the mass percentage of 5% to 12.5% to 82.5%; otherwise as described in example 1.
The service performance of the lime de-ironing copper tailing stabilized sea sand semi-rigid base layer of the embodiment is measured by the same measuring method as that in the embodiment 1. Maximum dry density (2.24 g/cm) determined by vibration test3) And the optimal water content (5.8 percent), tap water with the mass of 5.8 percent of that of the semi-rigid base layer of the lime iron-removing copper tailings stabilized sea sand is added into the mixture for mixing, and the unconfined compressive strength of the mixture in the 7d age is measured to be 1.89 MPa.
Example 4
In the process steps of embodiment 4, the same points as those of embodiment 1 are not repeated herein, and only the differences from embodiment 1 are described. The difference between the embodiment 4 and the embodiment 1 is that lime, iron-removed copper tailings and sea sand are mixed with each component substance according to the mass percentage ratio of 6% to 15% to 79% to obtain the semi-rigid base layer of the lime iron-removed copper tailings stabilized sea sand of the embodiment; otherwise as described in example 1.
The service performance of the lime de-ironing copper tailing stabilized sea sand semi-rigid base layer of the embodiment is measured by the same measuring method as that in the embodiment 1. Tap water with the mass of 6.7% of that of the semi-rigid base layer of the lime de-iron copper tailings stabilized sea sand is added into the mixture for mixing according to the maximum dry density and the optimal water content determined by a vibration test, and the unconfined compressive strength of the 7 d-age medium-aged medium-length sea sand is measured to be 2.14 MPa.
Example 5
In the description of embodiment 5, the same points as those of embodiment 1 will not be described again, and only the differences from embodiment 1 will be described. The difference between the embodiment 5 and the embodiment 1 is that lime, iron-removed copper tailings and sea sand are mixed according to the mass percentage ratio of 7 percent to 17.5 percent to 75.5 percent; the rest is the same as the embodiment 1, so that the semi-rigid base layer of the stabilized sea sand of the lime de-ironing copper tailings can be obtained.
The service performance of the lime de-ironing copper tailing stabilized sea sand semi-rigid base layer of the embodiment is measured by the same measuring method as that in the embodiment 1. And (3) adding tap water with the mass being 7.4% of the mass of the semi-rigid base layer of the sea sand stabilized by the iron-removed copper tailings of the prepared lime into the mixture for mixing through the maximum dry density and the optimal water content determined by a vibration test, and measuring the unconfined compressive strength of the mixture in the 7d age to be 1.97 MPa.
Example 6
The embodiment is coastal area engineering, and the design standard is a second-level highway.
This example also processed sea sand according to the process described in example 1 to obtain sea sand; the obtained sea sand was passed through the following mesh in the following mass percentages as shown in table 4.
The results of the screening in table 4 above were mixed in a mass ratio of 45% of ultrafine sand (particle size 0.075 mm to 2.36 mm) and 55% of rice sand (particle size 2.36 mm to 5 mm) to obtain sea sand.
Lime (calcareous slaked lime with effective CaO + MgO content not less than 60% and water content less than 5% by weight, and slaked lime sieved by a 0.6 mm square hole sieve during test) and copper tailings (Fe)2O3The content of SiO reaches more than 20 percent2、Al2O3The total content is close to 50 percent), iron powder tailings with the iron content of more than 80 percent can be obtained after the treatment of a rotary hearth furnace, and iron-removed copper tailings (SiO) obtained by drying and grinding the tailings and passing the tailings through a 45-micron negative pressure sieve 2、Al2O3、Fe2O3The total mass percent is not less than 70 percent, and the loss on ignition is not less than 10 percent) to prepare the lime de-ironing copper tailings stabilized sea sand semi-rigid base layer.
In the engineering, the lime de-iron copper tailings stabilized sea sand semi-rigid base layer adopts the following mixture ratio:
mixing the components according to the mass percentage ratio of 6 percent to 18 percent to 76 percent of lime, iron-removed copper tailings and sea sand; the maximum dry density of the mixture is 2.15 g/cm through vibration molding3Adding tap water with the mass being 7.1% of the mass of the prepared lime deironing copper tailings stabilized sea sand semi-rigid base layer into the mixture to mix the mixture, wherein the optimal water content is 7.1%; unconfined compression resistance of test piece in 7 d ageThe strength is 1.49MPa, and the measured deflection value of the test road section is 7 multiplied by 10-2mm～12×10-2mm（BZZ-100）。
It is known that: price of slaked lime: 235 yuan/ton, fly ash price: 120 yuan/ton, crushed stone: 60 yuan/ton, iron-removed copper tailings: 60 yuan/ton, sea sand: 20 yuan/ton. The density of the secondary ash stabilized base layer is 2148kg/m3。
The manufacturing cost of the lime iron-removing copper tailing stabilized sea sand semi-rigid base course prepared in each of examples 1 to 6 of the invention and the manufacturing cost of the two-lime gravel base course (raw materials: lime, fly ash and gravel) in the same proportion are shown in the following table 5.
As can be seen from Table 5: the manufacturing cost of the lime iron-removing copper tailing stabilized sea sand semi-rigid base course prepared in the embodiments 1 to 6 is as follows in sequence: 63.3 yuan/m 370.0 yuan/m376.8 yuan/m383.6 yuan/m390.3 yuan/m3And 96.1 yuan/m3(ii) a The manufacturing cost of the lime-fly-ash gravel base layer with the same proportion as that of each embodiment is respectively as follows: 149.8 yuan/m3156.8 yuan/m3163.8 yuan/m3170.8 yuan/m3177.7 yuan/m3And 174.6 yuan/m3(ii) a The manufacturing cost of the embodiment/the manufacturing cost of the two-ash base layer with the same proportion are as follows in sequence: 42.2%, 44.7%, 46.9%, 48.9%, 50.8% and 49.3%. Therefore, the manufacturing cost of each cubic meter of the semi-rigid base layer of the stabilized sea sand of the lime iron-removing copper tailings in the embodiment of the invention is 42.4-50.8% of the manufacturing cost of the base layer of the two-ash stabilized macadam in the same proportion. Practical engineering proves that the unconfined compressive strength of the lime deironing copper tailing stabilized sea sand semi-rigid base layer prepared by the method meets the standard requirement, the cost of the unlimited compressive strength does not exceed 50.8 percent of that of a secondary lime base layer with the same proportion, and the production cost is greatly reduced.
While the invention has been shown and described with reference to certain embodiments, those skilled in the art will understand that: various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (8)
1. The lime de-iron copper tailing stabilized sea sand semi-rigid base layer is characterized by comprising the following components in percentage by mass, which are uniformly mixed:
Sea sand 75.5% -89.5%;
7.5 to 17.5 percent of iron-removed copper tailings;
3 to 7 percent of lime.
2. The lime de-ironing copper tailing stabilized sea sand semi-rigid base layer according to claim 1, characterized in that the sea sand is obtained by removing shells from sea sand, washing with water and drying.
3. The lime de-ironing copper tailing stabilized sea sand semi-rigid base layer according to claim 2, characterized in that the sea sand consists of 40-60% by mass of ultrafine sand with a grain size of 0.075-2.36 mm and 40-60% by mass of rice sand with a grain size of 2.36-5 mm.
4. The stabilized sea sand semi-rigid substrate of claim 1, wherein said de-ferred copper tailings are made of Fe2O3The tailings of copper with the content of more than 20 percent can be treated by a rotary hearth furnace to obtain tailings of iron powder with the iron content of more than 80 percent, and the tailings are dried, ground and sieved by a negative pressure sieve with the diameter of 45 mu m to obtain the iron powder.
5. The lime de-ironing copper tailings stabilized sea sand semi-rigid substrate of claim 1, wherein the lime is a calcareous slaked lime having a density: 1.3 to 1.4g/cm3The effective CaO + MgO content is not less than 60%, the weight water content is less than 5%, and the slaked lime passes through a 0.6 mm square-hole sieve during the test.
6. The lime de-ironing copper tailing stabilized sea sand semi-rigid base layer according to any one of claims 1 to 5, wherein the 7d unconfined compressive strength of the lime de-ironing copper tailing stabilized sea sand semi-rigid base layer is not less than 1.61 MPa.
7. The preparation method of the lime de-ironing copper tailing stabilized sea sand semi-rigid base layer as claimed in any one of claims 1 to 6, characterized by uniformly mixing the following components in percentage by mass:
sea sand 75.5% -89.5%;
7.5 to 17.5 percent of iron-removed copper tailings;
3 to 7 percent of lime.
8. The method for preparing the semi-rigid base layer of lime de-ironing copper tailing stabilized sea sand according to claim 7, further comprising adding water to the semi-rigid base layer of lime de-ironing copper tailing stabilized sea sand prepared by uniformly mixing the components for mixing; wherein the addition amount of water is 5.1-7.4% of the mass of the semi-rigid base layer of the sea sand stabilized by the lime de-ironing copper tailings.
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| CN115504722A (en) * | 2022-11-02 | 2022-12-23 | 吉林大学 | Roadbed filler for treating copper tailing sand based on curing agent and preparation method thereof |
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