CN109456027B - Titanium slag extraction lime stabilized macadam material and preparation method thereof - Google Patents
Titanium slag extraction lime stabilized macadam material and preparation method thereof Download PDFInfo
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- CN109456027B CN109456027B CN201811492373.XA CN201811492373A CN109456027B CN 109456027 B CN109456027 B CN 109456027B CN 201811492373 A CN201811492373 A CN 201811492373A CN 109456027 B CN109456027 B CN 109456027B
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
Abstract
The invention provides a titanium slag-extracting lime stabilized macadam material and a preparation method thereof. The material is prepared from a binding material, broken stones, an additive and water, wherein the mass ratio of the binding material to the broken stones is 20-40: 50-70, wherein the binder comprises the following components in percentage by mass: 50-70% of titanium extraction slag, 4-16% of lime, 15-30% of steel slag micro powder and 0-20% of fly ash, wherein the crushed stone comprises graded crushed stone or steel slag crushed stone; the mass of the additive is 4-6% of that of the lime, and the additive comprises one or more of gypsum, sodium carbonate, water glass, sodium sulfate and calcium formate; the mass of the water is 4-18% of the total mass of the binder, the broken stone and the admixture in a dry state. The preparation method can adopt the raw materials to prepare. The beneficial effects of the invention can include: the raw materials are low in price and low in cost; a large amount of industrial waste residues including titanium extraction residues can be obtained; the construction process is simple and convenient; the strength of the material is increased quickly, the working period can be shortened, and the construction cost is reduced.
Description
Technical Field
The invention relates to the field of road materials and the field of industrial solid waste recycling, in particular to a titanium slag-extracting lime stabilized macadam material capable of improving the strength of a pavement base and a preparation method thereof.
Background
As the famous vanadium-titanium, the Panzhihua area contains rich vanadium-titanium magnetite resources, wherein the storage amount of TiO2 is as high as 1.3 hundred million tons, which accounts for over 90 percent of the domestic known storage amount, exceeds 1/3 of the world proven storage amount and is the first place in China. Under the current smelting process technical conditions of the Pan steel, about 50% of titanium resources in raw ores enter blast furnace slag to form the titanium-containing blast furnace slag which is special for the Pan steel, the current stock level reaches 7000 more than ten thousand, the titanium-containing blast furnace slag is increased at the speed of 300 more than ten thousand every year, and the Pan steel is the Pan steel and is the secondary titanium resource which is special in China.
In order to effectively utilize the Pan steel titanium-containing blast furnace slag, from 2004, Pan steel, namely a process of high-temperature carbonization-low-temperature selective chlorination, is promoted to the key research, and a pilot line is successfully built in 2009. However, when the titanium resource is recovered, a large amount of chlorine-containing tailings, namely titanium extraction slag, is generated, and the slag contains about 2-7% of chloride through low-temperature selective chlorination, which far exceeds the requirement that the content of chloride ions in the existing industrial standard is not higher than 0.06% (mass part), so that the slag cannot be directly used for cement and concrete like common blast furnace slag, and can only be stacked and processed, such as mountain titanium extraction slag, not only occupies a large amount of land resources, but also occupies precious land resources, causes serious pollution to the surrounding environment, brings huge environmental protection pressure to enterprises, and seriously influences and restricts the development of related industries.
The key problem for restricting resource utilization of titanium extraction slag is chloride ion content, and a common method is to remove chloride ions in the titanium extraction slag by washing and other modes, for example, the chloride ion content can be reduced by multistage water washing and other modes, but by the above modes, on one hand, a treatment process is increased, and the washing waste liquid also faces the treatment problem.
While titanium slag is accumulated in a large amount and pollutes the environment, the domestic traffic construction business is also developed rapidly, and the mileage of the domestic expressway reaches 13 kilometers by the end of 16 years. Taking Sichuan province as an example, the business mileage of railways of the whole province is about 4000 kilometers and the total highway mileage is about 35 kilometers when the year is 2017. According to the traffic development planning of Sichuan province: in 2018, the mileage of the highway which has been built and under construction reaches 9785km, which is the first place in western regions. According to the reports of the Chinese traffic network: in 2018, a trunk road is newly reconstructed in Sichuan province for 1500 kilometers, a rural road is newly reconstructed for 1.6 kilometers, and the new operating mileage of an expressway is nearly 1000 kilometers.
The rapid development of traffic construction needs a large amount of engineering materials, the natural and ecological environments are seriously damaged due to the excessive exploitation and utilization of natural materials, and the exploitation period of domestic high-quality limestone resources is only 15 years according to the current consumption speed by taking limestone as an example according to statistics. The huge consumption amount and resource shortage occur in many places, which leads to the annual rise of the price of engineering materials and drives the continuous rise of the construction cost, thereby forming the vicious circle of environment destruction, price increase and environment destruction, and greatly influencing the development of domestic engineering construction.
The results of domestic and foreign research and application show that: the blast furnace slag is a good road building material, nearly more than half of blast furnace slag is used for road engineering construction in foreign countries such as developed countries of English, American and the like, and research results show that: the Pan steel titanium slag contains a large amount of amorphous substances due to water quenching treatment, has high pozzolanic activity, and has high strength after being excited by a proper exciting agent.
In the construction of domestic high-grade highways, the two-ash stabilized macadam is a typical structure in a domestic expressway base course, and with the increase of national cement yield and the increase of fly ash price, the domestic road base course mainly uses cement macadams and consumes less and less solid waste represented by the fly ash. With the increase of environmental protection pressure, on one hand, the price of cement is continuously increased, and on the other hand, a large amount of industrial solid wastes including the steel industry solid wastes cannot be well utilized, if the cement is used for road construction, a large amount of steel industry solid waste materials can be consumed, waste can be changed into valuables, and the healthy development of the steel industry is effectively promoted.
Although related personnel use industrial waste slag such as steel slag and the like as raw materials for road infrastructure construction at present, published data for extracting titanium slag for road engineering are not found.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, an object of the present invention is to provide a stabilized crushed stone material of titanium slag-extracted lime which can utilize industrial waste slag, and a method for producing the same.
In order to achieve the above object, the present invention provides, in one aspect, a stabilized crushed stone material from titanium slag lime. The material can be prepared from a binding material, broken stones, an additive and water, wherein the mass ratio of the binding material to the broken stones is 20-40: 50-70, wherein the binder comprises the following components in percentage by mass: 50-70% of titanium extraction slag, 4-16% of lime, 15-30% of steel slag micro powder and 0-20% of fly ash; the crushed stone comprises graded crushed stone or steel slag crushed stone; the mass of the additive is 4-6% of that of the lime, and the additive comprises one or more of gypsum, sodium carbonate, water glass, sodium sulfate and calcium formate; the mass of the water is 4-18% of the total mass of the binder, the broken stone and the admixture in a dry state.
According to one or more exemplary embodiments on which the present invention is based, the binder may comprise the following components in mass percent: 55-62% of titanium extraction slag, 7-12% of lime, 17-25% of steel slag micro powder and the balance of fly ash.
According to one or more exemplary embodiments of the present invention, the binder includes, by mass, 50 to 70: 4-16: 15-30 of titanium extraction slag, lime and steel slag micro powder.
According to one or more exemplary embodiments on which the invention is based, the graded macadam has a crush value of 22% or less, a content of pin-flaked particles of 18% or less, a dust content of 1.2% or less at 0.075mm or less, and a soft stone content of 3% or less.
According to one or more exemplary embodiments of the present invention, the steel slag crushed stone may be prepared from steel slag aged for more than 6 months, and the f-CaO content of the steel slag crushed stone is not more than 4%.
According to one or more exemplary embodiments on which the present invention is based, the steel slag crushed stone may have a particle size of 60mm or less, and may include the following components in mass percent: 35-40% CaO, 16-20.5% SiO2、3.5～6％Al2O3、4～6.5％MgO、8～11％FeO、14～18％％Fe2O3、1.5～3.4％MnO、1.0～1.5％P2O5、1.4～2.1％TiO2。
According to one or more exemplary embodiments of the present invention, the steel slag micro powder has a particle size of 20 μm or less, and the f-CaO content of the steel slag micro powder may be 2.5 to 4.5%.
According to one or more exemplary embodiments of the present invention, the steel slag micropowder may include the following components in percentage by mass: 35-40% CaO, 16-20.5% SiO2、3.5～6％Al2O3、4～6.5％MgO、8～11％FeO、14～18％％Fe2O3、1.5～3.4％MnO、1.0～1.5％P2O5、1.4～2.1％TiO2。
According to one or more exemplary embodiments on which the present invention is based, the SiO in the fly ash2、Al2O3And Fe2O3The sum of the mass percentages of the components can be more than 70 percent, the mass fraction of the ignition loss is less than 20 percent, and the specific surface area of the fly ash is 2500cm2More than g.
According to one or more exemplary embodiments on which the present invention is based, the mass of the water is 6 to 14% of the mass of the base stock in a dry state.
According to one or more exemplary embodiments on which the present invention is based, the titanium extraction slag may include: the titanium-containing blast furnace slag is extracted by a high-temperature carbonization-low-temperature selective chlorination process.
According to one or more exemplary embodiments on which the invention is based, the sum of the mass fractions of CaO and MgO in the dry powder of lime may be not less than 90%, and the mass fraction of MgO may not exceed 5%, SO3The mass fraction may not exceed 2%.
According to one or more exemplary embodiments on which the present invention is based, the gypsum may include one or more of phosphogypsum, desulphurisation gypsum and natural gypsum.
The invention also provides a preparation method of the titanium slag-extracted lime stabilized macadam material. The method can be used for preparing the compound fertilizer by adopting the raw materials and the raw material proportion.
The preparation method of the titanium slag-extracting lime stabilized macadam material comprises the following steps: mixing a binder and an additive, and uniformly stirring to obtain a first intermediate product, wherein the binder comprises the following components in percentage by mass: 50-70% of titanium extraction slag, 4-16% of lime, 5-30% of steel slag micro powder and 0-20% of fly ash, wherein the mass of the additive is 4-6% of that of the lime, and the additive comprises one or more of gypsum, sodium carbonate, water glass, sodium sulfate and calcium formate; mixing the first intermediate product and the crushed stone, and uniformly stirring to obtain a second intermediate product, wherein the mass ratio of the crushed stone to the binder is 50-70: 20-40, wherein the crushed stone comprises graded crushed stone or steel slag crushed stone; adding water into the second intermediate product, and uniformly mixing to obtain a third intermediate product, wherein the mass of the water is 4-18% of that of the second intermediate product in a dry state; and rolling and molding the third intermediate product, and maintaining moisture to obtain the titanium slag-extracted lime stabilized macadam material.
Compared with the prior art, the beneficial effects of the invention can include: the raw materials are low in price and low in cost; a large amount of industrial waste residues including titanium extraction residues can be obtained; the construction process is simple and convenient; the strength of the material is increased quickly, the working period can be shortened, and the construction cost is reduced.
Detailed Description
Hereinafter, the titanium slag-extracting lime-stabilized crushed stone material and the method of manufacturing the same of the present invention will be described in detail with reference to the exemplary embodiments.
The titanium extraction slag is obtained by high-temperature carbonization-low-temperature chlorination of titanium-containing blast furnace slag, is difficult to be widely applied due to high chloride ion content, is mainly accumulated at present, occupies a large amount of land resources, and can pollute the environment, thereby seriously influencing and restricting the development of the titanium extraction industry.
In order to solve the problem of utilization of the titanium extraction slag, the invention provides the lime stabilized macadam material for the titanium extraction slag, which can consume a large amount of the titanium extraction slag on the premise of meeting the performance requirement of a pavement base material, thereby changing waste into valuable and realizing the resource utilization of solid waste materials.
In an exemplary embodiment of the invention, the titanium slag-extracted lime stabilized macadam material may be formulated from a binder, graded macadam, an admixture, and water. Wherein the mass ratio of the binder to the graded broken stones is 20-40: 50-70. The amount of the additive is 4-6% of the mass of the binder.
The binder comprises the following components in percentage by mass: 50-70% of titanium extraction slag, 4-16% of lime, 15-30% of steel slag micro powder and 0-20% of fly ash. The fly ash can be added or not added, when the fly ash is not added, the use of the fly ash is not influenced, but after the fly ash is added, the later strength can be improved, the volume stability can be better, the price of the fly ash is higher, so that the practical experiment mainly considers that the use amount of titanium slag is increased, the use amount of the fly ash is limited, and the use amount of the fly ash is limitedThe addition amount of the ash is 0-20%, and the requirement of strength index can be met. Lime is an important excitation material, when the content of lime is low, the excitation effect is not obvious enough, the strength of the prepared stabilized macadam material is low, and when the content of lime is too high, on one hand, the material cost is greatly increased, and meanwhile, excessive Ca (OH) is generated2Also, the early strength of the stabilized macadam is affected, so the optimum proportion is 4-16%. The steel slag micro powder is too high in doping amount, low in early strength and low in doping amount, so that the middle and later strength is not increased favorably, and the optimal doping amount is 15-30%. SiO in the fly ash2、Al2O3And Fe2O3The total content of the components should be more than 70%, the ignition loss should not exceed 20%, and the specific surface area should be more than 2500cm2(ii)/g; when wet fly ash is adopted, the water content is not more than 25%, and corresponding water content should be deducted when water is added in the design of the mixing proportion.
The technical indexes of the graded crushed stone are as follows: the crushing value is less than or equal to 22 percent, the content of needle-shaped particles is less than or equal to 18 percent, the content of dust below 0.075mm is less than or equal to 1.2 percent, and the content of soft stones is less than or equal to 3 percent.
The admixture may comprise one or more of gypsum, sodium carbonate, water glass, sodium sulphate and calcium formate. The admixture can be 4-6% of the lime by mass, the admixture is too low, the excitation effect is not obvious enough, the admixture is too high, the engineering cost can be increased, and the reasonable admixture is 4-6% of the lime dosage.
The mass of the water is 4-18% of that of the solid raw materials (namely the binding material, the graded crushed stone and the additive) in a dry state, so that the titanium slag-extracted lime stabilized crushed stone material can reach the maximum compact state on the premise of meeting the water consumption of hydration reaction; the strength of the prepared material is influenced by incomplete hydration reaction due to too low water amount; also, too high a quantity of water results in the presence of too much free water, which, after evaporation, produces excessive porosity, also detrimental to the strength of the material prepared. Further, the mass of the water is 6-14% of the mass of the solid raw material in a dry state. Wherein, the water should meet the following requirements: pH value of not less than 6.5 and not more than 9.5, total oxygen consumption of not more than 5mg/L, turbidity (NTU-scattering turbidity) of not more than 3, total organic carbon of not more than 5mg/L, and no odor and peculiar smell.
In this embodiment, the titanium extraction slag may include: the titanium-containing blast furnace slag is extracted by a high-temperature carbonization-low-temperature selective chlorination process. Or fine slag after further grinding or crushing. The titanium extraction slag can be raw slag of steel climbing titanium extraction slag without any treatment, and the 60-mesh sieve passing rate of the slag is 100 percent, and the 200-mesh sieve passing rate is more than or equal to 45 percent. Or the titanium extraction slag can be fine slag after further grinding or crushing. If the fine slag passing rate of 100 meshes after grinding or crushing is 100 percent and the passing rate of 200 meshes reaches over 75 percent, the performance of the prepared material is better.
The titanium extraction slag can comprise the following components in percentage by mass: 28-33% CaO, 20-25% SiO2、10～14％Al2O3、2～7％MgO、2～10％TiO2、2～4％Fe2O3And 2-5% of Cl element.
When the content of the titanium extraction slag is too low, the active ingredients in the binder are obviously low, and the strength is greatly influenced, so that the stabilizing effect is reduced, the resource utilization and the strength increase of the stabilized macadam are comprehensively considered, and the mass percentage of the titanium extraction slag in the binder can be 50-70%.
In this embodiment, the lime may be quick lime or slaked lime. When the lime is quicklime, fresh quicklime powder, CO thereof is preferably used2The content is not more than 4%. When the slaked lime is adopted, the mass fraction of free water in the slaked lime is not more than 2%, and the stability index is qualified. No matter quicklime powder or slaked lime powder is adopted, the sum of the mass fractions of CaO and MgO in dried lime powder after drying (for example, 105 ℃) is not less than 90 percent, the mass fraction of MgO is not more than 5 percent, and SO is3The mass fraction is not more than 2%. The lime can completely pass through a 20-mesh sieve, the passing rate of a 200-mesh sieve is not less than 98%, and the passing rate of a 300-mesh sieve is not less than 55%.
The lime mainly has the function of exciting active components in the titanium extraction slag and simultaneously forming a strong alkaline environment, which is beneficial to the reaction, and the lime water solution calcium hydroxide also directly participates in the hydration reaction and generates hydration products such as C-S-H, C-A-H, ettringite and the like after being hydrated together with the active components in the titanium extraction slag, and the products provide the strength of the prepared material after being hardened.
In this example, the median particle diameter d of the steel slag micropowder50Less than or equal to 10 mu m and the maximum grain diameter dmaxLess than or equal to 20 mu m; in other words, the granularity of the steel slag micro powder can be 1-20 μm, when the granularity is too small, the crushing cost is too high, and when the granularity is too large, the strength of the prepared composite material in the middle and later periods is increased disadvantageously, and the problem of volume stability is possibly brought, and the granularity can be 1-20 μm by comprehensively considering the technical economy; further, the particle size may be 10 μm or less.
The steel slag micro powder comprises the following main components in percentage by mass: 35-40% CaO, 16-20.5% SiO2、3.5～6％Al2O3、4～6.5％MgO、8～11％FeO、14～18％％Fe2O3、1.5～3.4％MnO、1.0～1.5％P2O5、1.4～2.1％TiO2. The content of free calcium oxide f-CaO may be 4% or less (mass fraction), for example, 2.5% ± 0.8%. If the free calcium oxide (f-CaO) exceeds 4%, the volume stability will be affected and the prepared material is liable to crack.
For example, the steel slag micro powder can comprise the following components in percentage by mass: 38.64% CaO, 18.62% SiO2、4.87％Al2O3、5.36％MgO、9.53％FeO、16.71％Fe2O3、2.02％MnO、1.28％P2O5、1.63％TiO2And the content of other substances: 1.34%, wherein the free calcium oxide f-CaO is 3.2%.
In this embodiment, the graded crushed stone can be replaced by steel slag crushed stone meeting the requirements of aging time and stability. The aging time is not less than 6 months, the content of f-CaO after aging is not more than 4 percent (mass fraction), and the used steel slag micro powder is the same as the steel slag crushed stone raw material. When the graded broken stone is steel slag broken stone, the maximum grain size of the steel slag broken stone is not more than 60mm, and the performance technical indexes of the steel slag broken stone are shown in table 1 according to different layer positions of materials.
TABLE 1 Steel slag Property specifications
In another exemplary embodiment of the invention, the titanium slag-extracting lime stabilized macadam material can be prepared from the following components in percentage by mass:
extracting titanium slag: 50-70%; lime: 5-16%; fly ash: 0 to 25 percent; steel slag micro powder: 10-35%; the materials are calculated according to the mass percentage, the total amount is 100 percent, and the materials form the binder together.
Additive: 4-6% of the mass of the binder, wherein the admixture is formed by mixing one or more of gypsum, sodium carbonate, water glass, sodium sulfate and calcium formate, and the mass of the admixture is 100% after the one or more components are mixed.
Grading broken stone: 50-70%. If the content of the graded crushed stone is lower than 50%, the consumption of titanium slag extraction is high, and the content of the crushed stone in the obtained suspension structure is lower, so that the performance can be influenced to a certain extent.
Water: the total mass of the three materials of the binding material, the additive and the graded crushed stone is 4-18% in a dry state.
In this embodiment, further, the mass ratio of each component may be as follows:
extracting titanium slag: 55-65%; lime: 6-12%; fly ash: 0 to 20 percent; steel slag micro powder: 15-30%; grading broken stone: 50-65%; the total content of the materials is 100 percent by weight.
Water: the total mass of the five materials is 6-14% in a dry state.
Additive: 4-6% of the mass of the binder, and the sum of the above materials is 100% by mass.
In the embodiment, when the material is prepared, the binder, the additive and the graded broken stone are firstly added into a mixer in proportion, the mixture is dry-mixed for 2-5 min, then water is added in proportion, the mixture is uniformly mixed, water dispersion and material segregation are avoided in the transportation process, and after rolling forming, moisture preservation and maintenance are carried out for more than 7 days.
In this example, the raw materials in the above example may be used for each raw material.
The 7d unconfined compressive strength of the titanium slag-extracted lime stabilized macadam in the two exemplary embodiments exceeds 3MPa, and the titanium slag-extracted lime stabilized macadam has the characteristics of fast strength increase, high strength, small dry shrinkage deformation, simple construction, high solid waste recycling degree and the like, is beneficial to recycling of industrial solid wastes, is an ideal road structure layer material, and can be widely used for various levels of road engineering.
The invention also provides a preparation method of the titanium slag-extracted lime stabilized macadam material. The method can adopt the titanium extraction slag, lime, fly ash, steel slag micro powder, graded crushed stone (or steel slag crushed stone), an additive and water as raw materials.
In another exemplary embodiment of the present invention, the preparation method may include the steps of:
mixing the binder and the additive, and uniformly stirring to obtain a first intermediate product; wherein, the binding material comprises the following components by mass percent: 50-70% of titanium extraction slag, 6-14% of lime, 20-30% of steel slag micro powder and the balance of fly ash; the mass of the additive is 4-6% of that of the binder, and the additive comprises one or more of gypsum, sodium carbonate, water glass, sodium sulfate and calcium formate.
The mass ratio is (24-46): (54-76) mixing the first intermediate product with the graded crushed stone, and uniformly stirring to obtain a second intermediate product; adding a certain amount of water into the second intermediate product, and uniformly mixing to obtain a third intermediate product, wherein the mass of the water is 4-18% of that of the second intermediate product in a dry state;
and rolling and molding the third intermediate product, and maintaining moisture to obtain the titanium slag-extracted lime stabilized macadam material.
In another exemplary embodiment of the present invention, the preparation method may include the steps of: weighing lime, titanium extraction slag, fly ash, steel slag micro powder, graded broken stone and additives according to the proportion in the above exemplary embodiments, placing the materials into a mixer to be uniformly stirred (the materials can be dry-stirred for 2-5 min), then adding water with a specified proportion, and further uniformly mixing.
And (4) transporting the mixed stabilized soil to a construction site, rolling to a specified compactness after paving, and preserving moisture and maintaining for more than 7 days.
In conclusion, the titanium slag-extracting lime stabilized macadam material and the preparation method thereof have the advantages that:
(1) compared with the common lime stabilized macadam and cement macadam, the lime and titanium slag are used as main stabilizing materials, the lime and titanium slag are low in price, and a large amount of industrial waste slag can be consumed.
(2) The prepared stabilized macadam is used for road engineering, can replace common lime stabilized macadam and cement macadam, and has obvious price advantage especially for low-grade roads in villages.
(3) The production equipment of the lime stabilized macadam and the cement macadam can be adopted, the production and construction process is simpler, and the construction is convenient.
(4) Compared with the lime stabilized macadam, the strength is increased quickly, the 7d unconfined compressive strength can reach more than 3MPa, exceeds the 28d strength of the lime stabilized macadam and is equivalent to the 7d strength of the cement stabilized macadam, so the construction period can be shortened, and the construction cost is reduced.
(5) Compared with the two-ash stabilized macadam, the cost of extracting titanium slag stabilized macadam by each cubic lime can be saved by more than 50 yuan, compared with the cement macadam, the cost of extracting titanium slag stabilized macadam by each cubic lime can be saved by more than 80 yuan, and the economic benefit is very obvious.
(6) Because a large amount of industrial waste residues are consumed, valuable land resources can be saved, the environment is protected, the pollution is reduced, and the social benefit is remarkable.
(7) The invention provides a resource method with large consumption and high added value for the steel climbing titanium slag, and compared with the traditional cement macadam, the method has lower material cost and higher popularization and application value.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The titanium slag-extracting lime-stabilized macadam material is characterized by being prepared from a binding material, macadams, an additive and water, wherein the mass ratio of the binding material to the macadams is 20-40: 50 to 70 of the total amount of the organic solvent,
the binding material comprises the following components in percentage by mass: 50-70% of titanium extraction slag, 4-16% of lime, 15-30% of steel slag micro powder and 0-20% of fly ash;
the crushed stone comprises graded crushed stone or steel slag crushed stone;
the mass of the additive is 4-6% of that of the lime, and the additive comprises one or more of gypsum, sodium carbonate, water glass, sodium sulfate and calcium formate;
the mass of the water is 4-18% of the total mass of the binder, the broken stone and the admixture in a dry state, and the water meets the following requirements: the pH value is more than or equal to 6.5 and less than or equal to 9.5, the total oxygen consumption is less than or equal to 5mg/L, the turbidity is less than or equal to 3, the total organic carbon is less than or equal to 5mg/L, and the fish oil has no peculiar smell and peculiar smell;
the titanium extraction slag comprises: slag obtained after titanium is extracted from the titanium-containing blast furnace slag through a high-temperature carbonization-low-temperature selective chlorination process;
the sum of the mass fractions of CaO and MgO in the dry powder of lime is not less than 90 percent, the mass fraction of MgO is not more than 5 percent, and SO3The mass fraction is not more than 2 percent;
the granularity of the steel slag micro powder is below 20 mu m, and the f-CaO content in the steel slag micro powder is 2.5-4%;
the steel slag crushed stone is prepared from steel slag aged for more than 6 months, and the f-CaO content in the steel slag crushed stone is not more than 4%;
SiO in the fly ash2、Al2O3And Fe2O3The sum of the mass percentages of the components is more than 70 percent, and the mass fraction of the ignition loss is less than 20 percent.
2. The titanium slag-extracting lime-stabilized crushed stone material as claimed in claim 1, wherein the crushed value of the graded crushed stone is 22% or less, the content of needle-like particles is 18% or less, the content of dust below 0.075mm is 1.2% or less, and the content of soft stone is 3% or less.
3. The titanium slag-extracting lime stabilized macadam material according to claim 1, wherein the steel slag macadam has a particle size of 60mm or less, and comprises the following components in percentage by mass:
35～40％CaO、16～20.5％SiO2、3.5～6％Al2O3、4～6.5％MgO、8～11％FeO、14～18％％Fe2O3、1.5～3.4％MnO、1.0～1.5％P2O5、1.4～2.1％TiO2。
4. the titanium slag-extracting lime-stabilized macadam material of claim 1, wherein the steel slag micro powder comprises the following components in percentage by mass:
35～40％CaO、16～20.5％SiO2、3.5～6％Al2O3、4～6.5％MgO、8～11％FeO、14～18％％Fe2O3、1.5～3.4％MnO、1.0～1.5％P2O5、1.4～2.1％TiO2。
5. the titanium slag-extracting lime-stabilized macadam material of claim 1, wherein the specific surface area of the fly ash is 2500cm2More than g.
6. The preparation method of the titanium slag-extracted lime stabilized macadam material is characterized by comprising the following steps of:
mixing a binder and an additive, and uniformly stirring to obtain a first intermediate product, wherein the binder comprises the following components in percentage by mass: 50-70% of titanium extraction slag, 4-16% of lime, 5-30% of steel slag micro powder and 0-20% of fly ash, wherein the mass of the additive is 4-6% of that of the lime, and the additive comprises one or more of gypsum, sodium carbonate, water glass, sodium sulfate and calcium formate;
mixing the first intermediate product and the crushed stone, and uniformly stirring to obtain a second intermediate product, wherein the mass ratio of the crushed stone to the binder is 50-70: 20-40, wherein the crushed stone comprises graded crushed stone or steel slag crushed stone;
adding water into the second intermediate product, and uniformly mixing to obtain a third intermediate product, wherein the mass of the water is 4-18% of that of the second intermediate product in a dry state;
rolling and molding the third intermediate product, and maintaining moisture to obtain the titanium slag-extracted lime stabilized macadam material;
wherein the water meets the following requirements: the pH value is more than or equal to 6.5 and less than or equal to 9.5, the total oxygen consumption is less than or equal to 5mg/L, the turbidity is less than or equal to 3, the total organic carbon is less than or equal to 5mg/L, and the fish oil has no peculiar smell and peculiar smell;
the titanium extraction slag comprises: slag obtained after titanium is extracted from the titanium-containing blast furnace slag through a high-temperature carbonization-low-temperature selective chlorination process;
the sum of the mass fractions of CaO and MgO in the dry powder of lime is not less than 90 percent, the mass fraction of MgO is not more than 5 percent, and SO3The mass fraction is not more than 2 percent;
the granularity of the steel slag micro powder is below 20 mu m, and the f-CaO content in the steel slag micro powder is 2.5-4%;
the steel slag crushed stone is prepared from steel slag aged for more than 6 months, and the f-CaO content in the steel slag crushed stone is not more than 4%;
SiO in the fly ash2、Al2O3And Fe2O3The sum of the mass percentages of the components is more than 70 percent, and the mass fraction of the ignition loss is less than 20 percent.
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| CN115093193B (en) * | 2022-06-20 | 2023-07-21 | 重庆交通大学 | Lime stabilized macadam material for fly ash generated by incineration of household garbage and preparation method thereof |
| CN115010449A (en) * | 2022-06-24 | 2022-09-06 | 西南科技大学 | Secondary ash stabilizing material, method for extracting titanium slag and improving early strength of titanium slag and application of secondary ash stabilizing material |
| CN115159881A (en) * | 2022-07-06 | 2022-10-11 | 西南科技大学 | Retarded alkali-activated titanium slag extracting cement and preparation method thereof |
| CN115180841A (en) * | 2022-07-06 | 2022-10-14 | 西南科技大学 | Alkali-activated titanium slag extraction cement and preparation method thereof |
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