CN115010449A - Secondary ash stabilizing material, method for extracting titanium slag and improving early strength of titanium slag and application of secondary ash stabilizing material - Google Patents

Secondary ash stabilizing material, method for extracting titanium slag and improving early strength of titanium slag and application of secondary ash stabilizing material Download PDF

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Publication number
CN115010449A
CN115010449A CN202210724662.8A CN202210724662A CN115010449A CN 115010449 A CN115010449 A CN 115010449A CN 202210724662 A CN202210724662 A CN 202210724662A CN 115010449 A CN115010449 A CN 115010449A
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China
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titanium
parts
slag
fly ash
lime
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CN202210724662.8A
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Chinese (zh)
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唐颂
彭同江
孙红娟
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Southwest University of Science and Technology
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Southwest University of Science and Technology
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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
    • C04B28/12—Hydraulic lime
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • E01C3/04—Foundations produced by soil stabilisation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention provides a two-ash stable material, a method for extracting titanium slag to improve the early strength of the titanium slag and application of the two-ash stable material, wherein the method comprises the following steps: mixing and uniformly mixing 4-20 parts of lime, 30-100 parts of fly ash, 30-100 parts of titanium extraction slag and 0-5 parts of auxiliary agent according to the mass parts to obtain a titanium extraction slag mixture; adding water, and carrying out hydration reaction to obtain the lime stabilizing material. The material is prepared from a titanium extraction slag mixture and water, wherein the titanium extraction slag mixture comprises the following components in parts by mass: 4-20 parts of lime, 30-100 parts of fly ash, 30-100 parts of titanium extraction slag and 0-5 parts of auxiliary agent; the phases of the fly ash stabilizing material are mainly hydrated calcium chloroaluminate and calcite. The invention can improve the early strength of the secondary-ash stabilizing material, promote the resource utilization of the titanium slag and the fly ash, and reduce the road construction cost.

Description

Secondary ash stabilizing material, method for extracting titanium slag and improving early strength of titanium slag and application of secondary ash stabilizing material
Technical Field
The invention relates to the technical field of road engineering, in particular to a secondary ash stabilizing material, a method for extracting titanium slag to improve the early strength of the secondary ash stabilizing material and application of the secondary ash stabilizing material.
Background
The lime-fly ash stabilized base course or subbase course as a typical pavement structure has the advantages of good integrity, high later strength, low price, capability of consuming a large amount of fly ash and the like, and is widely applied to the construction of the early expressway in China. However, the two-ash stable material has limited its popularization and application due to the defects of low early strength, slow strength increase, late open traffic and the like, and the existing Chinese pavement base structure is changed from the early two-ash stable material into a cement-stabilized macadam material.
Although the cement stabilized macadam has high early strength and fast strength increase, a large amount of cement needs to be consumed, the cement production is a high-energy-consumption and high-pollution process, a large amount of natural resources are consumed, simultaneously, a large amount of greenhouse gas is discharged, the ecological environment is greatly influenced, and the road construction cost is increased due to the continuously increased prices of cement and gravel materials.
In addition, the emission of the fly ash is broken through by 9 hundred million tons in 2020 as one of the current industrial waste residues with the largest emission in China. The cement-stabilized macadam is used for a pavement base course and a subbase course to replace widely used cement-stabilized macadam, so that the bulk utilization of the fly ash can be realized, and the road construction cost can be reduced.
Disclosure of Invention
The present invention is directed to solving at least one of the above-mentioned disadvantages of the prior art, and one of the objectives of the present invention is to provide a method for improving the early strength of a lime-stabilized material, thereby reducing the road construction cost.
In order to achieve the purpose, the invention provides a method for improving the early strength of a lime stabilized material by extracting titanium slag.
The method comprises the following steps: mixing and uniformly mixing 4-20 parts of lime, 30-100 parts of fly ash, 30-100 parts of titanium extraction slag and 0-5 parts of auxiliary agent according to the mass parts to obtain a titanium extraction slag mixture; adding water, and carrying out hydration reaction to obtain the lime stabilizing material.
According to an exemplary embodiment of the invention, the method may comprise: mixing lime and an auxiliary agent, and fully and uniformly mixing to obtain a mixture; and mixing the mixture with the fly ash and the titanium extraction slag and uniformly mixing to obtain a titanium extraction slag mixture.
According to an exemplary embodiment of the invention, the method may comprise: determining the optimal water content and the maximum dry density through an indoor standard compaction test; adding water for blending according to the optimal water content.
According to an exemplary embodiment of the present invention, the lime may include quicklime and/or slaked lime, and the lime has an effective calcium oxide and magnesium oxide content of 65% or more, a 20-mesh-sieve-passing rate of 100%, a 50-mesh-passing rate of 85% or more, and a 200-mesh-passing rate of 70% or more.
According to an exemplary embodiment of the invention, the titanium extraction slag can be chlorine-containing titanium extraction tailings obtained by high-temperature carbonization-low-temperature selective chlorination of titanium-containing blast furnace slag, and the specific surface area of the titanium extraction slag is more than or equal to 320m 2 Kg, the screen residue of a standard screen with the fineness of 150 meshes is 0, and the screen residue of a standard screen with the fineness of 200 meshes is less than or equal to 15 percent.
According to an exemplary embodiment of the present invention, the fly ash may include silica, alumina and iron oxide, and the sum of the three contents is greater than 70%, the loss on ignition of the fly ash is not more than 15%, the 50 mesh passing rate is greater than or equal to 55%, the 200 mesh passing rate is greater than or equal to 70%, and the water content is less than or equal to 30%.
According to an exemplary embodiment of the present invention, the auxiliary may include one or more of sodium hydroxide, potassium hydroxide, sodium silicate, calcium sulfate, and sodium sulfate, and the fineness of the auxiliary is 100% of a 200-mesh passing rate.
In another aspect, the present invention provides a two-ash stabilizing material. The secondary-ash stable material is prepared from a titanium extraction slag mixture and water, wherein the titanium extraction slag mixture comprises the following components in parts by mass: 4-20 parts of lime, 30-100 parts of fly ash, 30-100 parts of titanium extraction slag and 0-5 parts of auxiliary agent; the phases of the fly ash stabilizing material are mainly hydrated calcium chloroaluminate and calcite.
In another aspect, the invention provides an application of titanium extraction slag in improving the early strength of a fly ash stabilizing material, wherein the titanium extraction slag is obtained by high-temperature carbonization-low-temperature chlorination of titanium-containing blast furnace slag.
In yet another aspect, the present invention provides a method of making a road surface base and/or sub-base material.
The preparation method comprises the following steps: preparing a road base course and/or a subbase course material by using the prepared two-ash stabilizing material, wherein the preparation step is selected from at least one of the following modes: directly adopting the two-ash stable material as a road base layer and/or a subbase layer material; preparing secondary ash stabilized soil by using the secondary ash stabilized material and soil; preparing second ash stable macadam by using the second ash stable material and the macadam; when the lime is quicklime, the materials are evenly mixed, are subjected to material sealing for more than 3 hours under natural conditions, and are spread and rolled to the required compaction degree, so that the road pavement base layer and/or the subbase layer material is obtained.
In a final aspect, the present invention provides a road base and/or underlayment material.
The road pavement base layer and/or the subbase layer material is prepared by the preparation method of the road pavement base layer and/or the subbase layer material.
Compared with the prior art, the beneficial effects of the invention comprise at least one of the following:
(1) the two-ash stabilizing material can be used as a road base layer and a subbase layer material independently, can also be used as a cementing material for stabilizing soil and stabilized macadam, and effectively solves the problem of insufficient early strength of the two-ash stabilizing material.
(2) The lime stabilizing material has high later strength and low cost, and can be widely applied to road engineering.
(3) The fly ash can be consumed by the two-ash stabilizing material, so that the fly ash can be utilized in a large amount, and the road construction cost is reduced.
(4) The fly ash stabilizing material consumes chlorine-containing titanium extraction tailings obtained by high-temperature carbonization-low-temperature selective chlorination of the titanium-containing blast furnace slag, realizes resource utilization of the titanium extraction slag, and solves the problem of environmental pollution.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 shows a scanning electron microscope image of a two-ash stabilizing material cured for 3d in an exemplary embodiment of the invention;
FIG. 2 illustrates a scanning electron microscope image of a two-ash stabilizing material cured 7d in an exemplary embodiment of the invention;
FIG. 3 illustrates a scanning electron microscope image of a cured 14d fly ash stabilization material in an exemplary embodiment of the invention;
FIG. 4 illustrates a scanning electron microscope image of a two-ash stabilization material cured 28d in an exemplary embodiment of the invention;
fig. 5 illustrates different age XRD patterns of a gray stabilized material in an exemplary embodiment of the invention.
Detailed Description
Hereinafter, the fly ash stabilizing material and the method and application of the titanium slag to improve the early strength thereof according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
In the application, the titanium extraction slag refers to secondary industrial waste slag obtained by treating titanium-containing blast furnace slag serving as a raw material through a titanium extraction process of high-temperature carbonization-low-temperature selective chlorination. The titanium extraction process of high-temperature carbonization-low-temperature selective chlorination can be to extract high-titanium blast furnace slag (such as TiO) 2 Content of 22-25 percent) and carbon at high temperature (about 1450-1600 ℃), so that TiO in the mixture is reacted 2 TiC is formed, then chlorine is introduced at low temperature (about 450-600 ℃) to react, and the TiC formed in the front is converted into gas-phase TiCl 4 . The titanium extraction slag contains about 2-7% of chloride through low-temperature selective chlorination, far exceeds the requirement that the content of chloride ions in the existing industrial standard is not higher than 0.06% (mass part), and simultaneously contains unreacted carbon, so that the titanium extraction slag can not be directly used for cement and concrete like common blast furnace slag, can only be stacked and processed, accumulates the titanium extraction slag like a mountain, occupies a large amount of land resources, not only occupies precious land resources, but also causes serious pollution to the surrounding environment, brings huge environmental protection pressure to enterprises, and has serious shadowAnd the development of related industries is influenced and restricted.
The secondary ash stabilizing material has limited popularization and application due to the defects of low early strength, slow strength increase, late open traffic and the like, and the primary pavement base structure in China is converted into a cement stabilizing macadam material from the early secondary ash stabilizing material at present. The titanium extraction slag has higher chemical reaction activity and latent hydraulic property, but an effective recycling way is lacked at present, for example, the titanium extraction slag can be used for improving a secondary ash stabilizing material to prepare a lime-fly ash-titanium extraction slag stabilizing material, so that the early strength of the secondary ash stabilizing material is improved, the recycling of two industrial solid wastes of the titanium extraction slag and the fly ash can be promoted, and the road construction cost can be reduced.
Exemplary embodiment 1
The exemplary embodiment provides a method for extracting titanium slag and improving the early strength of a lime stabilized material, which can realize resource utilization of two industrial solid wastes of the titanium slag and fly ash and can effectively solve the problem of insufficient early strength of the lime stabilized material.
The method comprises the following steps:
s1: mixing and uniformly mixing 4-20 parts of lime, 30-100 parts of fly ash, 30-100 parts of titanium extraction slag and 0-5 parts of auxiliary agent according to the mass parts to obtain a titanium extraction slag mixture;
in the embodiment, lime and an auxiliary agent are mixed and fully and uniformly mixed to obtain a mixture; and mixing the mixture with the fly ash and the titanium extraction slag and uniformly mixing to obtain a titanium extraction slag mixture.
In this embodiment, the lime used may comprise calcium slaked lime or quicklime that meets the requirements of class II, i.e., lime has an effective calcium oxide and magnesium oxide content of 65% or more, e.g., 66%, 70%, 75%, 80%, 85%, 90%, 95%.
The lime mainly plays a role of calcium oxide and magnesium oxide, the active ingredients react with water to generate calcium hydroxide and magnesium hydroxide, the calcium hydroxide can ionize a large amount of hydroxide ions, so that glass bodies in the fly ash and the titanium extraction slag are excited to generate phases such as calcium silicate hydrate gel and calcium chloroaluminate hydrate, the gels and the phases are beneficial to increasing the strength of the material, when the content of the active calcium oxide and the content of the magnesium oxide are lower than 65%, the generated calcium hydroxide and magnesium hydroxide are low in quantity, the fly ash and the titanium extraction slag are difficult to be effectively excited, and the strength of the prepared material is difficult to meet the road use requirement.
In the embodiment, the lime 20-mesh sieve has a passing rate of 100%, the 50-mesh sieve has a passing rate of not less than 85%, and the 200-mesh sieve has a passing rate of not less than 70%.
Lime mainly plays a role of an excitant, if the lime is too thin, although the excitation effect is good, the processing cost of grinding and the like is too high, and the lime is not economical; if the lime is too coarse, the hydration reaction speed is slow, large-particle lime even is difficult to hydrate, waste is caused, the strength of the prepared material is low, the effect of improving the early strength cannot be obtained, and the volume expansion of a later-period product is easy to cause, so that the service performance of the prepared material is influenced.
The chemical reaction equation is as follows:
CaO+H 2 O＝Ca(OH) 2 (1)
Ca(OH) 2 +SiO 2 ＝CaSiO 3 ↓+H 2 O (2)
Ca(OH) 2 +CO 2 ＝CaCO 3 ↓+H 2 O (3)
3Ca(OH) 2 +Al 2 O 3 +CaCl 2 +7H 2 O＝3CaO·Al 2 O 3 ·CaCl 2 ·10H 2 O (4)
wherein, CaSiO 3 Is the main component of cement, CaSiO 3 With CaCO 3 And 3 CaO. Al 2 O 3 ·CaCl 2 ·10H 2 And O consolidates the loose fly ash and the titanium extraction slag together to form a whole and has certain integral strength.
In the embodiment, the titanium extraction slag is chlorine-containing titanium extraction tailings obtained by carrying out high-temperature carbonization-low-temperature selective chlorination on titanium-containing blast furnace slag, and the specific surface area of the titanium extraction slag is more than or equal to 320m 2 200/kg of standard sieve residue with fineness of 150 meshesThe screen residue of the target standard screen is less than or equal to 15 percent.
In an embodiment, the titanium extraction slag may comprise the following components in parts by mass: 33-48% of CaO and 20-28% of SiO 2 11 to 15% of Al 2 O 3 0.5 to 9% of MgO and 2 to 10% of TiO 2 2-4% of Fe 2 O 3 And 2-7% of Cl element.
The main function of the titanium extraction slag is to promote the early strength increase of the two-ash stable material, the hydration reaction activity of the titanium extraction slag is higher than that of the fly ash, calcium hydroxide generated after the quicklime is hydrolyzed firstly reacts with the titanium extraction slag to generate hydrated calcium silicate and hydrated calcium chloroaluminate, the titanium extraction slag particles are too coarse, the reaction speed with calcium hydroxide is too slow, the effect of improving the early strength of the lime stabilizing material is difficult to achieve, the titanium slag particles are too fine, although the hydration reaction speed can be greatly accelerated, the early strength of the lime stabilizing material is improved, but the grinding cost is required to be increased, the method is not economical, and after titanium slag particles are extracted to reach a certain particle size, the processing cost of continuous grinding is increased sharply, at the moment, the increasing effect on the hydration reaction speed is limited, and the titanium extraction slag has a reasonable fineness, namely the 150-mesh pass rate of 100 percent and d, from the comprehensive consideration of the two aspects of technology and economy. 50 Is 10 to 30 μm, for example, 11 μm, 15 μm, 20 μm, 25 μm, 29 μm.
After the titanium extraction slag is added, the early strength of the lime-fly ash material can be improved, the defects of low early strength, slow strength increase, late open traffic and the like of the lime-fly ash material are overcome, so that the lime-fly ash material can be widely applied to road construction, and the road strength is improved. Meanwhile, a large amount of titanium extraction slag can be utilized, and the problems that the titanium extraction slag is difficult to utilize, occupies land, pollutes the environment and the like are solved.
In this embodiment, the fly ash includes silica, alumina, and ferric oxide, and the sum of the contents of the three is greater than 70%, for example, 71%, 75%, 80%, 85%, 90%, 95%, and 99%.
In this embodiment, the loss on ignition of the fly ash is not more than 15%, the 50 mesh passage rate is not less than 55%, the 200 mesh passage rate is not less than 70%, and the water content of the wet fly ash is not more than 30%, otherwise, proper airing or drying should be performed.
In this embodiment, the auxiliary agent includes one or more of sodium hydroxide, potassium hydroxide, sodium silicate, calcium sulfate and sodium sulfate, and the fineness of the auxiliary agent is 100% of the 200-mesh sieve passing rate. The assistant has the functions of regulating reaction speed, regulating hydration reaction time and promoting material strength to increase.
S2: adding water, and carrying out hydration reaction to obtain the lime stabilizing material.
In the embodiment, the optimal water content and the maximum dry density are determined through an indoor standard compaction test; adding water for blending according to the optimal water content to obtain the lime stabilizing material.
Compaction test refers to a method of compacting a sample with a hammer to understand the compaction characteristics of the sample. The method uses different compaction works to respectively hammer samples with different water contents and measures corresponding dry density, thereby obtaining the maximum dry density and the optimal water content and providing basis for engineering design and construction.
After water is added, the titanium extraction slag mixture is subjected to hydration reaction, except original phases of titanium carbide and graphite-like carbon in the titanium extraction slag and mullite in the fly ash, new phases obtained by phase reconstruction mainly comprise hydrated calcium chloroaluminate and calcite, and the specific reaction process is as follows:
CaO+H 2 O＝Ca(OH) 2 (1)
3Ca(OH) 2 +Al 2 O 3 +CaCl 2 +7H 2 O＝3CaO·Al 2 O 3 ·CaCl 2 ·10H 2 O (2)
Ca(OH) 2 +CO 2 +nH 2 O＝CaCO 3 ↓+(n+1)H 2 O (3)
hydrated calcium chloroaluminate and calcite can enhance the early strength of the fly ash stabilization material.
Exemplary embodiment 2
The present exemplary embodiment provides a two-ash stabilizing material.
The fly ash stabilizing material is prepared from a titanium extraction slag mixture and water, and hydrated calcium chloroaluminate, calcite and other crystals are generated through hydration reaction after the titanium extraction slag is added, so that the early strength of the fly ash stabilizing material can be greatly improved. The problem of insufficient early strength of the lime stabilized material is effectively solved, and the resource utilization of the titanium slag can be realized.
The titanium extraction slag mixture comprises the following components in parts by weight:
lime 4-20 parts, for example, 5 parts, 6 parts, 9 parts, 10 parts, 12 parts, 15 parts, 17 parts, 19 parts;
30-100 parts of fly ash, such as 31 parts, 35 parts, 40 parts, 45 parts, 50 parts, 65 parts, 75 parts, 85 parts, 95 parts and 99 parts;
30-100 parts of titanium extraction slag, such as 31 parts, 35 parts, 40 parts, 45 parts, 50 parts, 65 parts, 75 parts, 85 parts, 95 parts and 99 parts;
0 to 5 parts of an auxiliary, for example, 0.5 part, 1 part, 2 parts, 3 parts, 4 parts, 4.5 parts.
The phases of the fly ash stabilizing material are mainly hydrated calcium chloroaluminate and calcite.
In the present example, as shown in fig. 1 to 4, microscopic electron microscope scanning images of the titanium slag-containing ash stabilizing material with a scale of 10 μm are shown. EHT in the figure represents the acceleration voltage; SignalA — SE2 stands for SE2 detector; date represents the Date of imaging; WD represents the working distance; mag stands for magnification; time represents imaging Time.
Fig. 1 is a scanning electron microscope image of the two-ash stabilizing material of this embodiment after being cured for 3d, from which it can be seen that when the fly ash and the titanium slag are mixed together, the surface of the glass beads in the fly ash has a gel material generated by reaction, but the boundary of individual beads is still obvious, and the number of hydration reaction products is small. FIG. 2 is an electron microscope scanning image after curing for 7d, in FIG. 2, hole represents a hole, and it can be seen that holes have been corroded on individual microbeads, and hydration products are obviously increased. Fig. 3 and fig. 4 are electron microscope scanning images of curing 14d and 28d, respectively, and it can be seen that as the reaction proceeds, the integrity of the two-ash stabilizing material becomes stronger and stronger, and many micro-beads of the fly ash are completely fused with the periphery to form a whole, so that the structure is more compact.
In this example, for titanium extraction slag: 1: 1, carrying out XRD analysis on the titanium extraction slag secondary ash stable material with the quicklime content of 10%, wherein XRD patterns of solidified body test pieces with different product proportions are similar at different ages, and except original phases of titanium carbide and graphite-like carbon in the titanium extraction slag and mullite in fly ash, new phases obtained by phase reconstruction mainly comprise hydrated calcium chloroaluminate and calcite. The hydrated calcium chloroaluminate and the calcite can effectively improve the early strength of the fly ash stabilizing material.
Exemplary embodiment 3
The present exemplary embodiments provide a method of making a road base and/or sub-base material.
The preparation method comprises the following steps: the two-ash stable material is directly adopted as the road base layer and/or the subbase layer material.
Specifically, lime, fly ash, titanium extraction slag and an auxiliary agent are weighed according to the mass percentage, the quick lime and the auxiliary agent are fully and uniformly mixed, and then the mixed quick lime and auxiliary agent are uniformly mixed with the fly ash and the titanium extraction slag to obtain the titanium extraction slag-two-ash composite stable material A.
When the composite stabilizing material A is directly used for the construction of the base course and the subbase course, the optimum water content and the maximum dry density are determined through an indoor standard compaction test and are used for controlling the construction quality of the base course and the subbase course.
When the lime is quicklime, the materials are evenly mixed, are subjected to material sealing for more than 3 hours under natural conditions, and are spread and rolled to the required compaction degree, so that the road pavement base layer and/or the subbase layer material is obtained.
The oversized quicklime particles can fully react with water to become calcium hydroxide after a certain time, the process is called material enclosing, the material enclosing time is insufficient, and the quicklime hydrolysis reaction is incomplete. After the product is prepared, if the material is not sealed, calcium oxide in the quicklime continuously undergoes hydrolysis reaction with water inside to generate calcium hydroxide, the volume of the process is increased by nearly one time, and the prepared product is easy to crack and other diseases due to volume expansion.
Exemplary embodiment 4
The present exemplary embodiment provides a method of preparing a road pavement base and/or underlayment material.
The preparation method is substantially the same as that of exemplary example 3, except that: and preparing the secondary ash stabilized soil by using the secondary ash stabilized material and soil, and preparing a road pavement base course and/or subbase course material.
Specifically, the lime, the fly ash, the titanium extraction slag and the auxiliary agent are weighed according to the mass percentage, the quick lime and the auxiliary agent are fully and uniformly mixed, and then the mixed quick lime and the mixed auxiliary agent are uniformly mixed with the fly ash and the titanium extraction slag to obtain the titanium extraction slag-two-ash composite stable material A.
If the two-ash composite stabilizing material A is used as a binder to prepare the titanium slag-extracted two-ash composite stabilizing soil, the plasticity index range of the stabilized soil body is preferably 12-20, and the content of organic matters in the soil is not more than 30%. At the moment, the composite stabilizing material A and the soil are proportioned according to different proportions, and then standard compaction tests are respectively carried out to determine the optimal water content and the maximum dry density of different proportions for construction quality control, the concrete process is the same as the proportioning process of the two-ash stabilizing material, and construction can be carried out according to the latest version of the JTG/T F20 of the construction technology of the road base course.
In this embodiment, the ratio of the two-ash stabilizing material to the soil is 20-80: 80-20. The minimum addition amount of the two-ash stabilizing material added with the titanium slag to the stabilized soil is not less than 20 percent, otherwise, the strength of the stabilized soil is reduced, and even the strength requirement of the stabilized soil cannot be met.
Exemplary embodiment 5
The present exemplary embodiment provides a method of preparing a road pavement base and/or underlayment material.
The preparation method is substantially the same as that of exemplary example 3, except that: and preparing the second-ash stabilized macadam and preparing a road pavement base course and/or subbase course material by using the second-ash stabilized material and the graded macadam.
Specifically, the lime, the fly ash, the titanium extraction slag and the auxiliary agent are weighed according to the mass percentage, the quick lime and the auxiliary agent are fully and uniformly mixed, and then the mixed quick lime and the mixed auxiliary agent are uniformly mixed with the fly ash and the titanium extraction slag to obtain the titanium extraction slag-two-ash composite stable material A.
If the titanium slag-lime composite stabilized macadam is used for preparing titanium slag-lime composite stabilized macadams, the concrete proportioning method and the construction process can refer to the related contents of the lime-lime composite stabilized macadam according to the requirements on the macadam materials.
In this embodiment, the proportion of the second ash stabilizing material to the graded crushed stone is 15-45: 85-55. The proportion of the crushed stones is too high, the gelling component is insufficient, the strength of the stabilized crushed stones can be reduced, and even the stabilizing effect can not be achieved.
In the above exemplary embodiments 3-5, when quicklime powder is used, the above materials are mixed uniformly, and then the mixture is sealed for more than 3 hours under natural conditions, and then spread and rolled to the required degree of compaction, so as to obtain the titanium slag-lime composite stabilized base layer or subbase layer material.
In order that the illustrative embodiments of the invention may be better understood, they are further described below in conjunction with specific examples.
Example 1
6 parts of dry quicklime powder, 40 parts of fly ash, 60 parts of titanium extraction slag and 5 parts of auxiliary agent are accurately weighed, and the quicklime powder and the auxiliary agent are uniformly mixed to obtain a mixture. And uniformly mixing the mixture with the fly ash and the titanium extraction slag to obtain a titanium extraction slag mixture. After the materials are sealed for 3 hours, taking part of the extracted titanium slag mixture, and obtaining the mixture with the optimal water content of 15.3 percent and the maximum dry density of 1.65g/cm by adopting a standard compaction test 3 . Adding water for proportioning according to the optimal water content, and rolling and forming with the compaction degree of 98% to carry out pavement subbase construction. After 7 days of covering and curing, coring the road surface, wherein the diameter and the height of the core sample are 10cm and 10cm, and after 24 hours of soaking, the unconfined compressive strength of the core sample is measured to have a representative value of 4.2MPa and a coefficient of variation of 7.8 percent.
Example 2
Accurately weighing 8 parts of dry slaked lime powder, 60 parts of fly ash, 60 parts of titanium extraction slag and 3 parts of auxiliary agent, and respectively and uniformly mixing the slaked lime powder and the auxiliary agent to obtain a mixture. And uniformly mixing the mixture with the fly ash and the titanium extraction slag to obtain a titanium extraction slag mixture. Mixing the above partsThe titanium slag-extracting mixture adopts a standard compaction test to obtain the mixture with the optimal water content of 16.8 percent and the maximum dry density of 1.65g/cm 3 . Adding water for proportioning according to the optimal water content, and rolling and forming with the compaction degree of 98% to carry out pavement subbase construction. After 7 days of covering and curing, coring the road surface, wherein the diameter and the height of the core sample are 10cm and 10cm, and after 24 hours of soaking, the unconfined compressive strength of the core sample is measured to have a representative value of 5.6MPa and a coefficient of variation of 8.1 percent.
Example 3
Accurately weighing 12 parts of dry quicklime powder, 50 parts of fly ash and 90 parts of titanium extraction slag, and respectively and uniformly mixing the quicklime powder, the fly ash and the titanium extraction slag to obtain a titanium extraction slag mixture. After the materials are sealed for 3 hours, taking part of the obtained titanium slag-extracting mixture, and obtaining the mixture with the optimal water content of 17.6 percent and the maximum dry density of 1.69g/cm by adopting a standard compaction test 3 . Adding water for proportioning according to the optimal water content, and rolling and forming with the compaction degree of 98% to carry out pavement subbase construction. After 7 days of covering and curing, coring the road surface, wherein the diameter and the height of the core sample are 10cm and 10cm, and after 24 hours of soaking, the unconfined compressive strength of the core sample is measured to have a representative value of 6.4MPa and a coefficient of variation of 6.6 percent.
Example 4
Accurately weighing 18 parts of dry slaked lime powder, 90 parts of fly ash and 40 parts of titanium extraction slag, and respectively and uniformly mixing the slaked lime powder, the fly ash and the titanium extraction slag to obtain a secondary-ash titanium extraction slag mixture. Then taking part of the uniformly mixed secondary ash extracted titanium slag mixture, and obtaining the mixture with the optimal water content of 14.9% and the maximum dry density of 1.61g/cm by adopting a standard compaction test 3 . Adding water for proportioning according to the optimal water content, and rolling and forming with the compaction degree of 98% to carry out pavement subbase construction. After 7 days of covering and curing, coring the road surface, wherein the diameter and the height of the core sample are 10cm and 10cm, and after 24 hours of soaking, the unconfined compressive strength of the core sample is measured to have a representative value of 4.6MPa and a coefficient of variation of 5.2 percent.
Comparative example 1
Accurately weighing 18 parts of dry slaked lime and 130 parts of fly ash, uniformly mixing the slaked lime and the fly ash to obtain a second-ash mixture, taking the second-ash mixture to perform a standard compaction test, and obtaining the mixture with the optimal water content of 14.5 percent and the maximum dry density of 1.57g/cm 3 Adding water according to the optimum water content and mixing, the compactness is 98% rolling and forming, and carrying out pavement subbase construction. After 7d of covering and curing, coring the road surface, and as a result, the core sample cannot be completely taken out, which indicates that the strength of the two-ash mixture in the 7d age period is too low to be completely molded. Coring at the age of 28 days, wherein the measured representative value of the unconfined compressive strength of the core sample is 2.1MPa, and the coefficient of variation is 7.2%.
Comparative example 2
6 parts of dry quicklime powder, 40 parts of fly ash and 5 parts of auxiliary agent are accurately weighed, and the quicklime powder and the auxiliary agent are uniformly mixed and then mixed with the fly ash to obtain a mixture. After the materials are sealed for 3 hours, taking part of the mixture, and obtaining the mixture by adopting a standard compaction test, wherein the optimal water content of the mixture is 15.9 percent, and the maximum dry density is 1.58g/cm 3 . Adding water for proportioning according to the optimal water content, and rolling and forming with the compaction degree of 98% to carry out pavement subbase construction. After 7d of covering and curing, coring the road surface and taking out the complete core sample, which indicates that the strength of the second ash mixture in the 7d age period is too low to be completely molded. Coring at the age of 28 days, wherein the end part of each core sample still has certain damage, the measured representative value of the unconfined compressive strength of the core sample is 2.6MPa, and the coefficient of variation is 6.7 percent.
As can be seen from the above examples 1-4 and comparative examples 1-2, the titanium slag extraction can effectively improve the early strength of the fly ash stabilizing material, in the comparative example without the titanium slag extraction, the pavement is maintained for 7d for coring, a complete core sample cannot be taken out, the core is taken in 28d for age, the end part of each core sample still has certain damage, the strength of the complete core sample is measured, and the representative value of the unconfined compressive strength of the core sample of the fly ash stabilizing material is 2.1MPa, and the coefficient of variation is 6.7%. After the titanium extraction slag is added, the maximum unconfined compressive strength representative value of the core sample of the secondary-ash stable material reaches 6.4MPa, the minimum coefficient of variation is 5.2%, and the representative value of the material strength is improved by 3 times.
Example 5
Accurately weighing 10 parts of quicklime, 50 parts of fly ash and 50 parts of titanium extraction slag, wherein the maximum particle size of the quicklime is 0.1mm, the 200-mesh passage rate is 90%, the 400-mesh passage rate is 60%, the maximum particle size of the titanium extraction slag is 0.15mm, and the 200-mesh passage rate is 65%, fully mixing the three materials uniformly according to a proportion, and performing a standard compaction experiment to obtain the mixture with the optimal water content of 16.6% and the maximum dry density of 1.64g/cm 3 . Adding water for proportioning according to the optimal water content, and rolling and forming with the compaction degree of 98% to carry out pavement subbase construction. After 7 days of covering and curing, coring the road surface, wherein the diameter and the height of the core sample are 10cm and 10cm, and after 24 hours of soaking, the unconfined compressive strength of the core sample is measured to have a representative value of 4.7MPa and a coefficient of variation of 7.3 percent.
Comparative example 3
Accurately weighing 10 parts of quicklime, 50 parts of fly ash and 50 parts of titanium extraction slag, wherein the maximum particle size of the quicklime is 0.5mm, the 200-mesh passage rate is 45%, the maximum particle size of the titanium extraction slag is 0.3mm, the 150-mesh passage rate is 35%, the fly ash is the same as that in example 5, fully and uniformly mixing the three materials in proportion, and carrying out a standard compaction test to obtain the calcium oxide with the optimal water content of 16.8% and the maximum dry density of 1.66g/cm 3 . Adding water for proportioning according to the optimal water content, and rolling and forming with the compaction degree of 98% to carry out pavement subbase construction. After 7 days of covering and curing, coring the road surface, wherein the diameter and the height of the core sample are 10cm and 10cm, and after 24 hours of soaking, the unconfined compressive strength of the core sample is measured to have a representative value of 2.3MPa and a coefficient of variation of 9.6 percent.
It can be seen from comparative examples 3 and 5 that the strength of the two-ash stabilizing material in example 5, in which the maximum particle size of quicklime is 0.1mm, the 200-mesh passage rate is 90%, the 400-mesh passage rate is 60%, and the maximum particle size of titanium-extracting slag is 0.15mm, and the 200-mesh passage rate is 65%, is increased by 1 time compared with that in comparative example 3, and thus it can be seen that the strength of the two-ash stabilizing material of the present invention can be improved by controlling the fineness of lime and titanium-extracting slag.
In conclusion, after the titanium extraction slag is added, hydrated clinoptilolite, calcite and other crystals are generated through hydration reaction, so that the early strength of the lime-fly ash stabilizing material can be greatly improved, and after the titanium extraction slag is added, the titanium extraction slag lime-fly ash composite stabilizing material can be used as a pavement base layer and a subbase layer material independently and can also be used as cementing materials for stabilizing soil and broken stones. The problem of insufficient early strength of the lime stabilized material is effectively solved, the resource utilization of the titanium slag can be realized, and the method has important economic, environmental and social benefits.
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 (10)

1. The method for improving the early strength of the two-ash stabilized material by extracting the titanium slag is characterized by comprising the following steps of:
mixing and uniformly mixing 4-20 parts of lime, 30-100 parts of fly ash, 30-100 parts of titanium extraction slag and 0-5 parts of auxiliary agent according to the mass parts to obtain a titanium extraction slag mixture;
adding water, and carrying out hydration reaction to obtain the lime stabilizing material.
2. The method for improving the early strength of a fly ash stabilized material by extracting titanium slag according to claim 1, wherein the method comprises:
mixing lime and an auxiliary agent, and fully and uniformly mixing to obtain a mixture;
and mixing the mixture with the fly ash and the titanium extraction slag and uniformly mixing to obtain a titanium extraction slag mixture.
3. The method for improving the early strength of a fly ash stabilized material by extracting titanium slag according to claim 1, wherein the method comprises:
determining the optimal water content and the maximum dry density through an indoor standard compaction test;
adding water for blending according to the optimal water content.
4. The method for improving the early strength of a two-ash stabilized material by extracting titanium slag according to claim 1, wherein the lime comprises quick lime and/or hydrated lime, the content of effective calcium oxide and magnesium oxide in the lime is more than or equal to 65%, the 20-mesh-sieve passing rate is 100%, the 50-mesh-sieve passing rate is more than or equal to 85%, and the 200-mesh-sieve passing rate is more than or equal to 70%.
5. The method for improving the early strength of a fly ash stabilized material by using the titanium-extracting slag as claimed in claim 1, wherein the titanium-extracting slag is titanium-containing blast furnace slag which is carbonized at high temperatureChlorine-containing titanium extraction tailings obtained by low-temperature selective chlorination, wherein the specific surface area of the titanium extraction tailings is more than or equal to 320m 2 Kg, the residue of a standard sieve with the fineness of 150 meshes is 0, and the residue of the standard sieve with the fineness of 200 meshes is less than or equal to 15 percent; the fly ash comprises silicon dioxide, aluminum oxide and ferric oxide, the sum of the contents of the silicon dioxide, the aluminum oxide and the ferric oxide is more than 70%, the loss on ignition of the fly ash is not more than 15%, the 50-mesh passage rate is not less than 55%, the 200-mesh passage rate is not less than 70%, and the water content is not more than 30%.
6. The method for improving the early strength of a fly ash stabilized material by extracting titanium slag according to claim 1, wherein the auxiliary agent comprises one or more of sodium hydroxide, potassium hydroxide, sodium silicate, calcium sulfate and sodium sulfate, and the fineness of the auxiliary agent is 100% of the passing rate of a 200-mesh sieve.
7. The secondary-ash stable material is characterized by being prepared from a titanium extraction slag mixture and water, wherein the titanium extraction slag mixture comprises the following components in parts by mass: 4-20 parts of lime, 30-100 parts of fly ash, 30-100 parts of titanium extraction slag and 0-5 parts of auxiliary agent;
the phases of the fly ash stabilizing material are mainly hydrated calcium chloroaluminate and calcite.
8. The application of the titanium extraction slag in improving the early strength of the fly ash stabilizing material is characterized in that the titanium extraction slag is obtained by carrying out high-temperature carbonization-low-temperature chlorination on titanium-containing blast furnace slag.
9. A method of preparing a road base and/or sub-base material, the method comprising: use of the dilast stabilised material prepared according to any one of claims 1 to 6 for formulating a road base layer and/or sub-base layer material, the formulating step being selected from at least one of the following ways:
directly adopting the two-ash stable material as a road base layer and/or a subbase layer material;
preparing secondary ash stabilized soil by using the secondary ash stabilized material and soil; and
preparing second ash stabilized macadam by using the second ash stabilized material and the macadam;
when the lime is quicklime, the materials are evenly mixed, are subjected to material sealing for more than 3 hours under natural conditions, and are spread and rolled to the required compaction degree, so that the road pavement base layer and/or the subbase layer material is obtained.
10. A road base and/or underlayment material characterized in that it is prepared by the preparation method of claim 9.
CN202210724662.8A 2022-06-24 2022-06-24 Secondary ash stabilizing material, method for extracting titanium slag and improving early strength of titanium slag and application of secondary ash stabilizing material Pending CN115010449A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109400084A (en) * 2018-12-07 2019-03-01 西南科技大学 A kind of high solid waste alkali-activated carbonatite mentions titanium slag and stablizes soil and preparation method thereof
CN109456027A (en) * 2018-12-07 2019-03-12 西南科技大学 One kind mentioning titanium slag lime stabilization crushed stone material and preparation method thereof
CN109456032A (en) * 2018-12-07 2019-03-12 西南科技大学 It is a kind of non-burning brick and preparation method thereof
CN113697834A (en) * 2021-08-31 2021-11-26 西南科技大学 Method for preparing Friedel salt by extracting titanium slag and Friedel salt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109400084A (en) * 2018-12-07 2019-03-01 西南科技大学 A kind of high solid waste alkali-activated carbonatite mentions titanium slag and stablizes soil and preparation method thereof
CN109456027A (en) * 2018-12-07 2019-03-12 西南科技大学 One kind mentioning titanium slag lime stabilization crushed stone material and preparation method thereof
CN109456032A (en) * 2018-12-07 2019-03-12 西南科技大学 It is a kind of non-burning brick and preparation method thereof
CN113697834A (en) * 2021-08-31 2021-11-26 西南科技大学 Method for preparing Friedel salt by extracting titanium slag and Friedel salt

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