CN114315299A - High-durability iron tailing hydraulic road base material and preparation method thereof - Google Patents
High-durability iron tailing hydraulic road base material and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of industrial waste recycling, and particularly relates to a high-durability iron tailing hydraulic road base material and a preparation method thereof, wherein the material comprises the following components in parts by weight: 80-100 parts of iron tailings and 5-15 parts of curing agent; the curing agent comprises the following components in parts by mass: 18-27 parts of phosphogypsum, 18-27 parts of carbide slag and 55 parts of slag. The high-durability iron tailing hydraulic road base material provided by the invention is scientific in formula design and reasonable in proportioning design, and when phosphogypsum, carbide slag, slag and iron tailing are mixed for use, a hydration reaction is carried out under the action of water, so that a roadbed is solidified and hardened, reaction products can be filled into gaps of the roadbed and the road surface, and the structural strength of the roadbed is improved.
Description
Technical Field
The invention belongs to the technical field of industrial waste recycling, and particularly relates to a high-durability iron tailing hydraulic road base material and a preparation method thereof.
Background
Along with the acceleration of the industrialized process of China, a large amount of waste rocks and tailings are generated in the mining process of mineral resources. The tailings which are discharged in large quantity and have extremely low recovery rate are generally subjected to landfill treatment through a tailing dam, and long-term accumulation and discarding of the tailings can cause serious environmental pollution and ecological damage, thereby greatly influencing the strategic targets of building resource-saving and environment-friendly society in China.
The iron tailings are solid mineral wastes with extremely low content of useful metals after crushing, screening, crushing, grading reselection and flotation of iron ores. In recent decades, China continuously explores the comprehensive utilization of tailings, and makes certain progress in the preparation of building materials, microcrystalline glass, ceramic materials and the like by using iron tailings. Wherein the application in the aspect of building materials has become a main utilization path of iron tailings. However, iron tailings have the characteristic of poor engineering properties due to small particle size, large specific surface area and the like, so that researches on solidification and comprehensive utilization of iron tailings are urgently needed.
Patent document No. CN109761516B discloses a method for solidifying iron tailings, which uses industrial waste residue as a solidifying agent, and adds a certain amount of chemical catalyst to solidify the iron tailings at a preset temperature. Wherein the industrial waste residue comprises the following materials in proportion: 0.1-5.0 parts of sludge, 0.1-15 parts of caustic sludge, 0-50 parts of fly ash, 0-80 parts of blast furnace slag micro powder and 0-5 parts of cement clinker. The catalyst is selected from one or more of sodium silicate, gypsum, cationic surfactant, early strength water reducing agent, antifreezing agent, early strength agent, retarder, waterproofing agent, lime, silica powder and latex. The 28d compressive strength of the solidified sample can reach 7.90MPa, and the waste utilization of the iron tailings is realized. But has the problems of high catalyst cost, complex process and the like.
Patent document No. CN110002808A discloses a method for solidifying iron tailings by using alkali-activated materials, which uses industrial waste residues as a solidifying agent. Wherein the industrial waste residue comprises the following materials in proportion: 1.2-1.6% of carbide slag, 3.6-4.8% of blast furnace granulated slag, 0.6-0.8% of fly ash and 0.6-0.8% of red mud. The 28d strength of the cured sample can reach 5.1MPa, the aim of treating wastes with wastes is achieved, but the problem of durability of the road base material is not involved.
Patent document CN110423079A discloses an iron tailings hydraulic road base material, which uses a curing agent and waste rocks to cure iron tailings. Wherein the curing agent comprises the following materials in proportion: 72-81 parts of mineral powder, 12-22 parts of an alkaline activator and 1-3 parts of a surfactant. The alkali activator is Na2CO3、NaOH、Na2SO4、KAl(SO4)2·6H2O、KNO2、NaF、K2CO3The surfactant is compounded by one or more of triethanolamine, sulfite pulp waste liquor, sodium acetate, sodium lignosulfonate and calcium lignosulfonate. The 28d strength of the cured sample can reach 6.4MPa, and the requirement of the strength performance index of the base layer is met. However, the cost of the alkaline activator and the active activator is high. Furthermore, the document does not investigate the durability of iron tailings hydraulic road base materials.
In road construction, a more rigid base layer takes over the role of transmitting the load. But because the climate of part of China is changeable, a serious challenge is formed to the basic level. Due to frost, rain soaking and the like, the base layer part has larger stress and deformation, so that the problems of collapse, cracks and the like of the base layer of the pavement are caused, and the service life of the road is seriously shortened. For example, patent publication No. CN106116395A discloses an inorganic binder stabilized soil as a road subbase filler and a preparation method thereof, which uses carbide slag and iron tailings as inorganic binders to improve soil body, and the inorganic binders as the road subbase filler can meet the strength requirement of the road subbase material. But the compressive strength is obviously reduced after soaking, and hidden troubles such as stress deformation under repeated load and the like can occur.
In view of the above, it is necessary to provide a new solidification method for iron tailings, so that the iron tailings can meet the strength requirement of the road base material and have better capability of coping with natural disasters such as frost, rainwater and the like.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, provides a high-durability iron tailings hydraulic road base material and a preparation method thereof, provides a solution for cracking and collapse of the existing roadbed material in a wet and cold environment on the basis of solving the problem of industrial solid waste accumulation, achieves the aim of treating wastes with processes of wastes against one another, and realizes the resource utilization of industrial wastes.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
the high-durability iron tailings hydraulic road base material comprises the following components in parts by weight: 80-100 parts of iron tailings and 5-15 parts of curing agent.
Further, in the high-durability iron tailings hydraulic road base material, the material comprises the following components in parts by weight: 90 parts of iron tailings and 10 parts of curing agent.
Furthermore, in the high-durability iron tailings hydraulic road base material, the iron tailings are fine iron tailings, and the sand grain diameter of the iron tailings is less than or equal to 282 mu m;
further, in the above high durability iron tailings hydraulic road base material, the iron tailings comprise the following components in percentage: 34-35% of silicon dioxide, 15-17% of calcium oxide, 15-17% of ferric oxide, 17% of magnesium oxide and 12-13% of aluminum oxide.
Further, in the high-durability iron tailings hydraulic road base material, the curing agent comprises the following components in parts by weight: 18-27 parts of phosphogypsum, 18-27 parts of carbide slag and 55 parts of mineral powder.
Furthermore, in the high-durability iron tailings hydraulic road base material, the particle size of the phosphogypsum is less than or equal to 280 mu m.
Further, in the high-durability iron tailings hydraulic road base material, the phosphogypsum comprises the following components in percentage: 4 to 6 percent of silicon dioxide, 46 to 47 percent of calcium oxide, 0.5 to 0.6 percent of ferric oxide, 1 to 3 percent of aluminum oxide and 43 to 45 percent of sulfur trioxide.
Further, in the above high durability iron tailings hydraulic road base material, the carbide slag comprises the following components in percentage: 4 to 6 percent of silicon dioxide, 91 to 93 percent of calcium oxide, 0.1 to 0.3 percent of ferric oxide and 1 to 3 percent of alumina; the particle size of the carbide slag is less than or equal to 280 mu m.
Further, in the above high durability iron tailings hydraulic road base material, the strength grade of the ore powder is S95.
The method for preparing the high-durability iron tailings hydraulic road base material comprises the following steps:
s1, weighing iron tailings and curing agents according to a ratio to form raw materials including phosphogypsum, carbide slag and mineral powder;
s2, uniformly mixing the phosphogypsum, the carbide slag, the mineral powder and the iron tailings to obtain the high-durability hydraulic road base material of the iron tailings.
In the invention, the curing agent consists of phosphogypsum, carbide slag and slag, and plays a role in curing fine iron tailings as follows:
phosphogypsum: the mass range of the sulfur trioxide and the calcium oxide is 89-92%, the sulfur trioxide and the calcium oxide exist in the form of calcium sulfate dihydrate, the calcium sulfate dihydrate reacts with hydrated calcium aluminate to generate ettringite, and the ettringite fills a system to densify the system.
Carbide slag: the main component of the calcium hydroxide is calcium oxide which reacts with water to generate calcium hydroxide, so that an alkali environment is provided for the reaction, and simultaneously, the calcium hydroxide is used as a reactant of the volcanic ash reaction to accelerate the reaction and generate calcium silicate hydrate gel. The carbon dioxide in the air is adsorbed to form calcium carbonate with the increase of the amount of the calcium hydroxide, and the reaction formula is as follows:
calcium silicate hydrate: xCa (OH)2+SiO2+(n-1)H2O→xCaO·SiO2·nH2O
Calcium carbonate: CO 22+Ca(OH)2＝CaCO3↓+H2O
Slag: the mass range of the silicon dioxide and the aluminum oxide is 49-52%, the mass range of the calcium oxide is 36-38%, the calcium hydroxide is generated after the calcium oxide is hydrated and is used as a reactant of hydrated calcium silicate gel, the unreacted calcium hydroxide provides an alkali environment for reaction, and the calcium hydroxide reacts with the silicon dioxide and the aluminum oxide to generate hydrated calcium aluminate gel, and iron tailing particles are wrapped to form a net-shaped framework.
The invention has the beneficial effects that:
1. the high-durability iron tailing hydraulic road base material provided by the invention is reasonable in formula design, all raw materials are derived from industrial solid wastes, the resource recycling of the industrial solid wastes is realized, the environmental pollution is reduced, and the high-durability iron tailing hydraulic road base material belongs to an environment-friendly curing agent raw material.
2. The high-durability iron tailing hydraulic road base material provided by the invention reduces the engineering cost, and the phosphogypsum, carbide slag and mineral slag belong to industrial wastes and have lower cost, so that the cost of a curing agent is greatly reduced.
3. The invention has simple production and application process, and finished products such as cement clinker and the like do not need to be doped in the preparation process; the whole operation is simple, and the popularization is easy.
Of course, it is not necessary for any one product that embodies the invention to achieve all of the above advantages simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an X-ray diffraction pattern of samples prepared in examples 1 to 5 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The specific embodiment of the invention is as follows:
example 1
The embodiment provides a high-durability iron tailing hydraulic road base material which is obtained by uniformly mixing and stirring 10 parts of curing agent and 90 parts of iron tailing by mass.
The curing agent comprises the following components in parts by mass: 18 parts of phosphogypsum, 27 parts of carbide slag and 55 parts of slag.
The high-durability iron tailings hydraulic road base material comprises the following steps:
s1: uniformly mixing the phosphogypsum, the carbide slag, the slag and the iron tailings to obtain the high-durability hydraulic road base material of the iron tailings.
S2: adding designed water doping amount into the high-durability iron tailing hydraulic road base material in S1, stirring uniformly at normal temperature to form uniform granular materials, compacting and molding under static pressure, demolding, and naturally curing to different ages to form a solidified body sample.
S3: and (3) curing the solidified body sample of S2 to 28d, performing freeze-thaw cycle test on the freeze-thaw resistance of the solidified body sample by referring to JTG E51-2009 test Specification for inorganic binder stabilizing materials for highway engineering, and performing dry-wet cycle test on the water resistance of the solidified body sample.
In step S2, the water doping amount is designed to be 17%; the static pressure compaction forming refers to the manufacturing method (cylindrical shape) of the inorganic binder stabilizing material of JTGE 51-2009 inorganic binder stabilizing material test regulation of highway engineering for preparing samples.
According to the technical specification of (DB 13/T2512-2017) iron tailings for highway base construction, the strength requirement of the cement-stabilized iron tailings for the highway base under the second level is not less than 1.5 MPa. The results of example 1 show that: the high durability iron tailings hydraulic road base material described in this example is operable as a sub-grade highway sub-base filler.
In FIG. 1, a is the X-ray diffraction pattern of the 28 d-stage of this example.
Example 2
The embodiment provides a high-durability iron tailing hydraulic road base material which is obtained by uniformly mixing and stirring 10 parts of curing agent and 90 parts of iron tailing by mass.
The curing agent comprises the following components in parts by mass: 81 parts of phosphogypsum, 99 parts of carbide slag and 220 parts of slag.
The high-durability iron tailings hydraulic road base material comprises the following steps:
s1: uniformly mixing the phosphogypsum, the carbide slag, the slag and the iron tailings to obtain the high-durability hydraulic road base material of the iron tailings.
S2: adding designed water doping amount into the high-durability iron tailing hydraulic road base material in S1, stirring uniformly at normal temperature to form uniform granular materials, compacting and molding under static pressure, demolding, and naturally curing to different ages to form a solidified body sample.
S3: and (3) curing the solidified body sample of S2 to 28d, performing freeze-thaw cycle test on the freeze-thaw resistance of the solidified body sample by referring to JTG E51-2009 test Specification for inorganic binder stabilizing materials for highway engineering, and performing dry-wet cycle test on the water resistance of the solidified body sample.
The designed water doping amount in the step S2 is 17%; the static pressure compaction forming refers to the manufacturing method (cylindrical shape) of the inorganic binder stabilizing material of JTGE 51-2009 inorganic binder stabilizing material test regulation of highway engineering for preparing samples.
According to the technical specification of (DB 13/T2512-2017) iron tailings for highway base construction, the strength requirement of the cement-stabilized iron tailings for the highway base under the second level is not less than 1.5 MPa. Example 2 the results show that: the high durability iron tailings hydraulic road base material described in this example is operable as a sub-grade highway sub-base filler.
In FIG. 1, b is the X-ray diffraction pattern of the present example at 28 d-stage.
Example 3
The high-durability iron tailing hydraulic road base material provided by the embodiment is obtained by uniformly mixing and stirring 10 parts of curing agent and 90 parts of iron tailing by mass.
The curing agent comprises the following components in parts by mass: 9 parts of phosphogypsum, 9 parts of carbide slag and 22 parts of slag.
The high-durability iron tailings hydraulic road base material comprises the following steps:
s1: uniformly mixing the phosphogypsum, the carbide slag, the slag and the iron tailings to obtain the high-durability hydraulic road base material of the iron tailings.
S2: adding designed water doping amount into the high-durability iron tailing hydraulic road base material in S1, stirring uniformly at normal temperature to form uniform granular materials, compacting and molding under static pressure, demolding, and naturally curing to different ages to form a solidified body sample.
S3: and (3) curing the solidified body sample of S2 to 28d, performing freeze-thaw cycle test on the freeze-thaw resistance of the solidified body sample by referring to JTG E51-2009 test Specification for inorganic binder stabilizing materials for highway engineering, and performing dry-wet cycle test on the water resistance of the solidified body sample.
In step S2, the water doping amount is designed to be 17%; the static pressure compaction forming refers to the manufacturing method (cylindrical shape) of the inorganic binder stabilizing material of JTGE 51-2009 inorganic binder stabilizing material test regulation of highway engineering for preparing samples.
According to the technical specification of (DB 13/T2512-2017) iron tailings for highway base construction, the strength requirement of the cement-stabilized iron tailings for the highway base under the second level is not less than 1.5 MPa. Example 3 the results show that: the high durability iron tailings hydraulic road base material described in this example is operable as a sub-grade highway sub-base filler.
In FIG. 1, c is the X-ray diffraction pattern of the 28 d-stage of this example.
Example 4
The embodiment provides a high-durability iron tailing hydraulic road base material which is obtained by uniformly mixing and stirring 10 parts of curing agent and 90 parts of iron tailing by mass.
The curing agent comprises the following components in parts by mass: 99 parts of phosphogypsum, 81 parts of carbide slag and 220 parts of slag.
The high-durability iron tailings hydraulic road base material comprises the following steps:
s1: uniformly mixing the phosphogypsum, the carbide slag, the slag and the iron tailings to obtain the high-durability hydraulic road base material of the iron tailings.
S2: adding designed water doping amount into the high-durability iron tailing hydraulic road base material in S1, stirring uniformly at normal temperature to form uniform granular materials, compacting and molding under static pressure, demolding, and naturally curing to different ages to form a solidified body sample.
S3: and (3) curing the solidified body sample of S2 to 28d, performing freeze-thaw cycle test on the freeze-thaw resistance of the solidified body sample by referring to JTG E51-2009 test Specification for inorganic binder stabilizing materials for highway engineering, and performing dry-wet cycle test on the water resistance of the solidified body sample.
In step S2, the water doping amount is designed to be 17%; the static pressure compaction forming refers to the manufacturing method (cylindrical shape) of the inorganic binder stabilizing material of JTGE 51-2009 inorganic binder stabilizing material test regulation of highway engineering for preparing samples.
According to the technical specification of (DB 13/T2512-2017) iron tailings for highway base construction, the strength requirement of the cement-stabilized iron tailings for the highway base under the second level is not less than 1.5 MPa. Example 4 the results show that: the high durability iron tailings hydraulic road base material described in this example is operable as a sub-grade highway sub-base filler.
In FIG. 1, d is the X-ray diffraction pattern of the 28 d-stage of this example.
Example 5
The high-durability iron tailing hydraulic road base material provided by the embodiment is obtained by uniformly mixing and stirring 10 parts of curing agent and 90 parts of iron tailing by mass.
The curing agent comprises the following components in parts by mass: 27 parts of phosphogypsum, 18 parts of carbide slag and 55 parts of slag.
The high-durability iron tailings hydraulic road base material comprises the following steps:
s1: uniformly mixing the phosphogypsum, the carbide slag, the slag and the iron tailings to obtain the high-durability hydraulic road base material of the iron tailings.
S2: adding designed water doping amount into the high-durability iron tailing hydraulic road base material in S1, stirring uniformly at normal temperature to form uniform granular materials, compacting and molding under static pressure, demolding, and naturally curing to different ages to form a solidified body sample.
S3: and (3) curing the solidified body sample of S2 to 28d, performing freeze-thaw cycle test on the freeze-thaw resistance of the solidified body sample by referring to JTG E51-2009 test Specification for inorganic binder stabilizing materials for highway engineering, and performing dry-wet cycle test on the water resistance of the solidified body sample.
In step S2, the water doping amount is designed to be 17%; the static pressure compaction forming refers to the manufacturing method (cylindrical shape) of the inorganic binder stabilizing material of JTGE 51-2009 inorganic binder stabilizing material test regulation of highway engineering for preparing samples.
According to the technical specification of (DB 13/T2512-2017) iron tailings for highway base construction, the strength requirement of the cement-stabilized iron tailings for the highway base under the second level is not less than 1.5 MPa. Example 5 the results show that: the high durability iron tailings hydraulic road base material described in this example is operable as a sub-grade highway sub-base filler.
In FIG. 1, e is the X-ray diffraction pattern of the 28 d-stage of this example.
The mechanical properties of the cured body obtained from the high-durability iron tailings hydraulic road base material of each example of the invention are shown in table 1:
TABLE 1
The dry-wet and freeze-thaw cycle strength loss rates of the cured bodies obtained from the high durability iron tailings hydraulic road base material of the various embodiments of the present invention are shown in table 2:
TABLE 2
| Examples | Dry and wet cycle strength loss rate% | Percent strength loss of freeze-thaw cycle% |
| 1 | -54.78 | -14.32％ |
| 2 | -46.21 | -12.25 |
| 3 | -36.27 | -10.32 |
| 4 | -27.03 | -9.28 |
| 5 | -15.48 | -7.61 |
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A high-durability iron tailings hydraulic road base material is characterized in that: the material comprises the following components in parts by mass: 80-100 parts of iron tailings and 5-15 parts of curing agent.
2. The high durability iron tailings hydraulic road base material of claim 1, wherein: the material comprises the following components in parts by mass: 90 parts of iron tailings and 10 parts of curing agent.
3. The high durability iron tailings hydraulic road base material according to claim 1 or 2, wherein: the iron tailings are fine iron tailings, and the sand grain diameter of the iron tailings is less than or equal to 282 mu m.
4. The high durability iron tailings hydraulic road base material of claim 3, wherein: the iron tailings comprise the following components in percentage: 34-35% of silicon dioxide, 15-17% of calcium oxide, 15-17% of ferric oxide, 16-18% of magnesium oxide and 12-13% of aluminum oxide.
5. The high durability iron tailings hydraulic road base material according to claim 1 or 2, wherein: the curing agent comprises the following components in parts by weight: 18-27 parts of phosphogypsum, 18-27 parts of carbide slag and 55 parts of mineral powder.
6. The high durability iron tailings hydraulic road base material of claim 5, wherein: the particle size of the phosphogypsum is less than or equal to 280 mu m.
7. The high durability iron tailings hydraulic road base material of claim 5, wherein: the phosphogypsum comprises the following components in percentage: 4 to 6 percent of silicon dioxide, 46 to 47 percent of calcium oxide, 0.5 to 0.6 percent of ferric oxide, 1 to 3 percent of aluminum oxide and 43 to 45 percent of sulfur trioxide.
8. The high durability iron tailings hydraulic road base material of claim 5, wherein: the carbide slag comprises the following components in percentage: 4 to 6 percent of silicon dioxide, 91 to 93 percent of calcium oxide, 0.1 to 0.3 percent of ferric oxide and 1 to 3 percent of alumina; the particle size of the carbide slag is less than or equal to 280 mu m.
9. The high durability iron tailings hydraulic road base material of claim 5, wherein: the strength grade of the ore powder is S95.
10. A method of making the high durability iron tailings hydraulic road base material of claim 1 or 2, wherein: the method comprises the following steps:
s1, weighing iron tailings and curing agents according to a ratio to form raw materials including phosphogypsum, carbide slag and mineral powder;
s2, uniformly mixing the phosphogypsum, the carbide slag, the mineral powder and the iron tailings to obtain the high-durability hydraulic road base material of the iron tailings.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352255A (en) * | 2011-07-20 | 2012-02-15 | 东南大学 | Silt curing agent base on industrial waste materials |
| CN103332910A (en) * | 2013-07-18 | 2013-10-02 | 东南大学 | Soft soil curing agent based on three industrial wastes |
| US20190119159A1 (en) * | 2016-04-14 | 2019-04-25 | Phosphogreen Ltd | Composite material comprising phosphogypsum |
| CN110002808A (en) * | 2019-05-17 | 2019-07-12 | 辽宁工程技术大学 | A kind of alkali-activated material solidification iron tailings sand and preparation method thereof and application method |
| CN110818378A (en) * | 2019-11-13 | 2020-02-21 | 安徽省东润新材料科技有限公司 | Iron tailing hydraulic roadbed filling material and preparation method thereof |
-
2022
- 2022-01-13 CN CN202210038432.6A patent/CN114315299A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352255A (en) * | 2011-07-20 | 2012-02-15 | 东南大学 | Silt curing agent base on industrial waste materials |
| CN103332910A (en) * | 2013-07-18 | 2013-10-02 | 东南大学 | Soft soil curing agent based on three industrial wastes |
| US20190119159A1 (en) * | 2016-04-14 | 2019-04-25 | Phosphogreen Ltd | Composite material comprising phosphogypsum |
| CN110002808A (en) * | 2019-05-17 | 2019-07-12 | 辽宁工程技术大学 | A kind of alkali-activated material solidification iron tailings sand and preparation method thereof and application method |
| CN110818378A (en) * | 2019-11-13 | 2020-02-21 | 安徽省东润新材料科技有限公司 | Iron tailing hydraulic roadbed filling material and preparation method thereof |
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Application publication date: 20220412 |