CN113387671A - Method for optimizing water-resistant stability all-solid-waste filling material ratio of large water mine - Google Patents
Method for optimizing water-resistant stability all-solid-waste filling material ratio of large water mine Download PDFInfo
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a method for optimizing the proportion of a full-solid waste filling material with water resistance stability in a large water mine, which relates to the technical field of solid waste utilization, can realize the optimized combination and synergistic effect of solid waste resources, prepare the filling material meeting the water resistance requirement, and provide support for safe and reliable low-quality solid waste and large-scale resource utilization; the method comprises the following steps: s1, preparing a plurality of mixed powder with different proportions, including phosphogypsum and blast furnace slag; s2, carrying out a filler strength test and a water resistance test on all the mixed powder to obtain test results of the mixed powder with different proportions; s3, establishing a mathematical model of the strength of the filling body and a mathematical model of the water-resistant stability according to the test result; s4, establishing a full-solid waste filling material proportion optimization model by taking the filling material cost as an optimization target and the two mathematical models as constraint conditions; and S5, solving the model to obtain the optimized proportion of the full-solid waste filling material. The technical scheme provided by the invention is suitable for the mine filling process.
Description
Technical Field
The invention relates to the technical field of solid waste utilization, in particular to a method for optimizing the proportion of a water stability resistant full-solid waste filling material for a large water mine.
Background
With the rapid development of economy and the continuous development and utilization of mineral resources in China, the mineral resources with high grade and good mining technical conditions are gradually exhausted, and more resources with deep burial, high stress, rich water and poor stratum conditions are faced. The mining by the filling method is the first choice of safe and environment-friendly mining and green mining. The tailing cemented filling body using cement as the gelling agent has low strength and poor fluidity, which results in large dosage of cementing materials and high filling mining cost.
With the coming out and strict management of new environmental protection law in China, high-activity blast furnace slag becomes a precious resource, the utilization cost is increased year by year, and the high-activity blast furnace slag is in short supply and demand in certain areas in China. And low-quality solid wastes such as phosphogypsum, carbide slag, steel slag, fly ash, copper tailings and the like are low in resource utilization due to low activity. Therefore, the low-quality solid waste is utilized in the filling mining, so that the filling mining cost can be reduced, and a way is explored for harmless, quantitative-reduction and high-value utilization of the low-quality solid waste.
Research shows that low-quality solid wastes not only have poor activity and slow hydration reaction, which causes low strength of a filling body, but also have poor water-resistant stability of a cemented filling body, and in a water-rich environment of a large water mine, the mechanical property of the filling body soaked in water for a long time is degraded, and the strength is reduced, thereby providing potential serious potential safety hazards for filling mining. Therefore, the water stability of low quality solid waste is a concern for use in large water mine fill mining.
The phosphogypsum is a solid waste in phosphate fertilizer industry, and a large amount of phosphogypsum is discharged by phosphate fertilizer chemical enterprises every year along with the rapid development of high-concentration compound fertilizer industry in recent years in China. Because harmful mineral components exist in the phosphogypsum, the activity is low and the water resistance is poor, so that the utilization rate of the phosphogypsum is less than 5 percent at present, and most of the phosphogypsum is subjected to stacking treatment. Not only occupies a large amount of land, but also seriously pollutes the environment, thereby inhibiting the development of the phosphate fertilizer industry. Obviously, the development of the utilization way of low-quality solid wastes such as phosphogypsum and fly ash as resources is inevitable.
The phosphogypsum contains harmful P2O5Chemical components cause the problems of low strength of a cementing body, swelling accompanied with soaking and strength deterioration, which are main influence factors of the massive resource utilization of the phosphogypsum, so that key technologies and application fields of the resource utilization of the phosphogypsum are continuously explored. The Chinese invention patent CN 103133033A discloses a mine phosphogypsum cemented filling pulping process, CN 108191365A discloses a method for cemented filling of metal mines by using phosphogypsum materials, both invention patents propose low-quality filling material pulping processes, but do not relate to the problem of water stability resistance of filling bodiesTo give a title. The Chinese invention patent CN 109133830A discloses a preparation method of a low-quality self-leveling material, and widens the resource utilization approach of phosphogypsum in the technical field of building materials. Chinese patent CN 107382239A discloses "Total solid waste Filler for stabilizing fly ash containing kaki incineration" and a preparation method thereof, wherein phosphogypsum is used for preparing the total solid waste Filler for stabilizing and solidifying the solid waste containing kaki incineration fly ash and the like, and the problems of solidified body strength and water resistance stability are not considered.
In conclusion, the water resistance stability of the large water mine cemented filling body not only influences the stability and safety of a filling stope, but also plays a vital role in controlling the surrounding rock deformation, roof caving, inducing water permeability and other catastrophe accidents. At present, the method for improving the water-resistant stability of a filling body mainly comprises the steps of adding fibers or additives and water-resistant materials, not only improving the filling mining cost, but also complicating the stoping process.
Therefore, there is a need to develop a method for optimizing the proportion of the whole solid waste filling material with water stability in a large water mine to overcome the shortcomings of the prior art, so as to solve or alleviate one or more of the above problems.
Disclosure of Invention
In view of the above, the invention provides a method for optimizing the proportion of the full-solid waste filling material with the water resistance stability in the large water mine, which can realize the optimized combination and synergistic effect of the solid waste resources, prepare the full-solid waste filling material meeting the water resistance requirement, and provide support for the safe and reliable utilization of low-quality solid waste in the large water filling mine and the large resource utilization.
The invention provides a method for optimizing the proportion of a full-solid waste filling material with water stability resistance of a large water mine, which is characterized by comprising the following steps:
s1, drying and grinding the solid waste material to obtain a plurality of mixed powder with different proportions; each mixed powder comprises phosphogypsum and blast furnace slag;
s2, performing a filler strength test and a water resistance test on all the mixed powder obtained in the step S1 to obtain filler strength test results and water resistance test results of the mixed powder with different proportions;
s3, establishing a mathematical model of the strength of the filling body and a mathematical model of the water-resistant stability according to the strength test result and the water-resistant performance test result of the filling body obtained in the step S2;
s4, establishing a full-solid waste filling material ratio optimization model by taking the filling material cost as an optimization target and taking the filling body strength mathematical model and the water-resistant stability mathematical model obtained in the step S3 as constraint conditions;
and S5, solving the all-solid-waste filling material ratio optimization model obtained in the S4 to obtain the optimized ratio of the all-solid-waste filling material.
The above aspect and any possible implementation further provides an implementation, wherein the parameter requirements of the phosphogypsum include: p2O5Less than or equal to 5 percent, the water content is less than or equal to 3 percent, MgO is less than or equal to 3 percent, and the specific surface area is more than or equal to 200m2/kg。
The above aspect and any possible implementation further provides an implementation, and the parameter requirements of the blast furnace slag include: the fineness of the blast furnace slag micro powder is less than or equal to 5 percent or the specific surface area is more than or equal to 420m2Kg, mass coefficient not less than 1.6, activity index not less than 0.3 and water content<3％。
The above aspects and any possible implementation manner further provide an implementation manner, and the mixed powder further comprises one or more of carbide slag, fly ash and copper tailings.
The above aspect and any possible implementation manner further provide an implementation manner, and the parameter requirements of the carbide slag, the fly ash and the copper tailings include: water content ratio<3 percent and the specific surface area is more than or equal to 300m2/kg。
The above aspect and any possible implementation manner further provide an implementation manner, where the mixed powder includes phosphogypsum, blast furnace slag and carbide slag, and the mass ratio of each component is: 40-65% of phosphogypsum, 15-40% of blast furnace slag and 10-20% of carbide slag;
the mixed powder comprises the following components in percentage by mass when the mixed powder comprises phosphogypsum, blast furnace slag, carbide slag and copper tailings: 40-50% of phosphogypsum, 25-35% of blast furnace slag, 10-15% of carbide slag and 5-20% of copper dressing tailings;
the mixed powder comprises the following components in percentage by mass when the mixed powder comprises phosphogypsum, blast furnace slag, carbide slag and fly ash: 40-50% of phosphogypsum, 25-35% of blast furnace slag, 10-15% of carbide slag and 5-20% of fly ash.
The above aspects and any possible implementation manners further provide an implementation manner, and the obtaining manner of the water resistance performance test and the water resistance performance test result includes: preparing two groups of filling body test blocks, and respectively placing the two groups of filling body test blocks in water and a curing box for curing; and testing the uniaxial compressive strength of the two groups of the filling body test blocks, and taking the ratio of the uniaxial compressive strength of the filling body test blocks under two curing conditions as the water resistance test result of the mixed powder.
The above-described aspect and any possible implementation further provide an implementation, in step S3:
performing regression analysis on the filling body strength test result by using a quadratic polynomial to establish mathematical models of the strengths of the cemented filling bodies 7d and 28 d;
and (4) performing regression analysis on the water resistance test result by using a quadratic polynomial, and establishing a water resistance stability mathematical model of the 28d filling body.
The above-described aspects and any possible implementations further provide an implementation in which the mathematical model of the strength of the cemented filling bodies 7d and 28d is:
R7d＝f1(x1,x2,…，xn)、R28d＝f2(x1,x2,…，xn)；
wherein R is7d、R28dRepresenting the strength of the filling bodies 7d, 28 d; x is the number of1,x2,…，xnRepresenting the proportion of the total solid waste filling material; f. of1、f2Representing the relation function of the strength of the filling bodies 7d and 28d and the solid waste mixing amount;
the water-resistant stability mathematical model is as follows:
K28d＝f3(x1,x2,…，xn)；
wherein, K28dRepresenting the water stability factor, x, of cured 28d pack1,x2,…，xnRepresenting the ratio of the total solid waste filling material, f3Representing the water stability factor of the 28d filling body as a function of the solid waste addition.
In the above-described aspect and any possible implementation manner, there is further provided an implementation manner, in step S4, the model for optimizing the proportion of the total solid waste filling material includes:
optimizing the target: MinCT＝Minfc(x1,x2,…，xn)；
Constraint conditions are as follows: r7d＝f1(x1,x2,…，xn)≥[R7d]
R28d＝f2(x1,x2,…，xn)≥[R28d]
K28d＝f3(x1,x2,…，xn)≥[K28d]；
Wherein, CTRepresenting the total solid waste filling material cost, fc(x1,x2,…，xn) As a function of filling material cost;
[R7d]、[R28d]represents the design value of the strength of the fillers 7d, 28d, [ K ]28d]Represents the design value of the water stability factor of the 28d pack.
Compared with the prior art, one of the technical schemes has the following advantages or beneficial effects: the low-quality solid waste is applied to the filling method mining of the large water mine, so that the potential risk of catastrophic instability caused by the deterioration of the saturated water soaking strength of the large water mine can be avoided, the low-quality solid waste is ensured to be safely utilized in the large water mine, the economic benefit and the environmental benefit of filling mining can be improved, the application of filling mining technology is promoted, and a way is explored for the reduction, the harmlessness and the resource utilization of the low-quality solid waste.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for optimizing the proportion of a full-solid waste filling material with water stability in a large water mine according to an embodiment of the invention;
FIG. 2 is a particle size grading distribution curve of phosphogypsum of Gansu Van Fu company provided by an embodiment of the invention;
FIG. 3 is a particle size distribution curve of fine slag powder from Handover Steel company according to an embodiment of the present invention;
FIG. 4 is a diagram of the micro-topography of phosphogypsum according to one embodiment of the present invention;
figure 5 is an XRD pattern of phosphogypsum provided by an embodiment of the present invention;
FIG. 6 is a sample of copper tailings provided in accordance with an embodiment of the present invention;
FIG. 7 is a particle size distribution curve for copper tailings provided in accordance with an embodiment of the present invention;
FIG. 8 is a XRD diffractogram of fly ash from a thermal power plant provided by an embodiment of the present invention;
FIG. 9 is a particle size distribution curve of fly ash from a thermal power plant according to an embodiment of the present invention.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Aiming at the defects of the prior art, the method fully utilizes low-quality solid waste with various performances and different characteristics, cooperates with high-activity blast furnace slag, develops a water-resistant full-solid waste filling material, and is an important way for improving the utilization of solid waste resources and reducing the filling mining cost. The invention provides a water-resistant stable low-quality all-solid-waste filling material proportioning optimization method for a large water filling mine. The method is characterized in that phosphogypsum is used as a main solid waste, a compound excitation and synergistic action mechanism is carried out by utilizing different characteristics of blast furnace slag micro powder, carbide slag, fly ash, copper tailings and the like, a proportioning optimization model of the all-solid-waste filling material is established, the optimal combination and synergistic action of solid waste resources are realized, the all-solid-waste filling material meeting the water resistance requirement is prepared, and an optimal design method is provided for the safe, reliable and large-scale resource utilization of low-quality solid waste in large-water filling mines. As shown in fig. 1, the method comprises the steps of:
(1) and carrying out chemical analysis and specific table test on the low-quality solid waste and the slag micro powder. Firstly, the solid waste is dried and crushed into solid waste with the specific surface area more than or equal to 200m2The powder per kg (mainly phosphogypsum) has the micro specific surface area of blast furnace slag of more than or equal to 420m2Or the fineness is less than or equal to 5 percent; one or more low-quality solid wastes such as carbide slag, fly ash and copper tailings are selected according to requirements to prepare the filling material with the blast furnace slag micro powder. The specific surface area of the solid waste drying and grinding is more than 400m2/kg。
P in chemical composition of phosphogypsum2O5Less than or equal to 5 percent, the water content is less than or equal to 3 percent, MgO is less than or equal to 3 percent, and the specific surface area is more than or equal to 200m2Per kg; the mass coefficient of the blast furnace slag is
Index of activity
The fineness of the blast furnace slag micro powder is less than or equal to 5 percent or the specific surface area is more than or equal to 420m2Water content/kg<3％；
Water content of carbide slag, flyash and copper tailings<3 percent and the specific surface area is more than or equal to 300m2/kg。
(2) Tests on the strength and the water resistance of the filling body of the full-solid waste filling material with different proportions are carried out. And (3) selecting a full solid waste filling material system and a mixing amount range according to different solid waste resources in the step (1). On the basis, carrying out orthogonal test design on the full-solid waste filling material aiming at the selected system, and carrying out a strength test and a water-resistant stability test on the cemented filling body according to a cement mortar strength test method B/T17671-1999 to obtain the strength and water-resistant stability test results of the cemented filling bodies of the full-solid waste filling material with different proportions;
the water resistance stability test content may include: the method comprises the following steps of (1) designing strength tests of all-solid-waste filling materials with different proportions, preparing two groups of filling body test blocks, placing the two groups of filling body test blocks in water and a curing box for curing for 28 days after demolding, and then testing the uniaxial compressive strength of the two groups of test blocks; the ratio of the strength of the test block under the two curing conditions is defined as the water resistance index of the filler. And obtaining the test result of the water stability coefficient of the filling body of the all-solid-waste filling material according to the test.
The full solid waste filling material system comprises: a phosphogypsum-slag micro powder-carbide slag system, a phosphogypsum-slag micro powder-carbide slag-copper tailings system and a phosphogypsum-slag micro powder-carbide slag-fly ash system.
The proportioning range of the phosphogypsum-slag micro powder-carbide slag system is as follows: 40-65% of phosphogypsum, 15-40% of slag micro powder and 10-20% of carbide slag. The proportioning range of the phosphogypsum-slag micro powder-carbide slag-copper tailings system is as follows: 40-50% of phosphogypsum, 25-35% of slag micro powder, 10-15% of carbide slag and 5-20% of copper dressing tailings. The proportioning range of the phosphogypsum-slag micro powder-carbide slag-fly ash system is as follows: 40-50% of phosphogypsum, 25-35% of slag micro powder, 10-15% of carbide slag and 5-20% of fly ash.
(3) And establishing a mathematical model of the strength and the water-resistant stability of the filling body. According to the test results of the strength and the water resistance stability of the filling body of the total solid waste filling material in the step (2), regression analysis is carried out on the test data by using a quadratic polynomial, and mathematical models of the strength and the water resistance stability of the filling body under different curing age conditions (such as 7d and 28d) are established as follows:
R7d＝f1(x1,x2,…，xn)、R28d＝f2(x1,x2,…，xn)、K28d＝f3(x1,x2,…，xn)；
wherein R is7d、R28dRepresenting the strength of the filling bodies 7d, 28 d; x is the number of1,x2,…，xnRepresenting the proportion of the total solid waste filling material; k28dRepresenting the water stability coefficient of the cured 28d filling body; f. of1、f2Representing the relation function of the strength of the filling bodies 7d and 28d and the solid waste mixing amount; f. of3Representing the function of the water resistance stability of cured 28d pack and solid waste admixture.
(4) And establishing a full-solid waste filling material proportion optimization model. The method comprises the following steps of establishing a full-solid waste filling material ratio optimization model by taking the cost of the filling material as an optimization target and the strength and the water-resistant stability of a cemented filling body as constraint conditions:
optimizing the target: MinCT＝Minfc(x1,x2,…，xn) (1)
Constraint conditions are as follows: r7d＝f1(x1,x2,…，xn)≥[R7d]
R28d＝f2(x1,x2,…，xn)≥[R28d] (2)
K28d＝f3(x1,x2,…，xn)≥[K28d]
Wherein, CTRepresents total solid wasteTotal cost of filling material, fc(x1,x2,…，xn) Is a cost function of the total solid waste filling material; [ R ]7d]、[R28d]Represents the design value of the strength of the cemented filling bodies 7d and 28 d; f. of1、f2Representing the strength function of the filling bodies 7d, 28 d; f. of3Representing the water stability function of cured 28d filling; [ K ]28d]Represents the design value of the water stability factor of the 28d pack.
(5) And solving the optimization model of the full-solid waste filling material. And (5) solving the all-solid-waste filling material ratio optimization model in the step (4), so as to obtain the optimized ratio of the filling material.
The invention provides a method for optimizing the proportion of a water-resistant stable full-solid waste filling material for application of low-quality solid waste in a large water mine. And (4) optimizing the proportion of the filling material by establishing a full-solid waste filling material proportion optimizing model. The low-quality solid waste comprises phosphogypsum, carbide slag, fly ash, copper tailings and high-activity blast furnace slag micro powder. The following description will be made in conjunction with three systems of all-solid-waste filling materials.
Example 1: phosphogypsum-slag micro powder-carbide slag system
The proportion of the phosphogypsum-slag micro powder-carbide slag system full-solid waste filling material is optimized, firstly, the solid waste of the system is dried and ground, and then, chemical component analysis and particle size test are carried out. The chemical composition analysis results of the phosphogypsum in the filling material of the system are shown in the table 1. The particle size distribution curve is shown in figure 2.
Table 1: chemical component analysis result of phosphogypsum
| Chemical composition | P2O5 | Fe2O3 | Al2O3 | MgO | CaO | SO4 2- | F | Acid insoluble substance |
| Content/% | 1.47 | 0.48 | 0.36 | 2.44 | 28.6 | 49.07 | 0.87 | 10.17 |
The particle size distribution curve of the slag micro powder in the phosphogypsum-slag micro powder-carbide slag system is shown in figure 3, and the content of fine particles with the particle size of-45 mu m in the slag micro powder accounts for 81.9 percent;
the chemical components of the slag micro powder are shown in Table 2, and the mass coefficient of the slag micro powder
Coefficient of activity
Table 2: analysis result of chemical components of blast furnace slag micro powder
| Chemical composition | CaO | SiO2 | Al2O3 | MgO | SO3 | Fe2O3 |
| Content/% | 43.51 | 30.68 | 14.03 | 7.35 | 1.32 | 0.72 |
| Chemical composition | TiO2 | MnO | K2O | Na2O | P2O5 | Others |
| Content/% | 0.68 | 0.57 | 0.54 | 0.33 | 0.06 | 0.21 |
The microcosmic surface morphology structure of the phosphogypsum is shown in figure 4, and the XRD spectrum is shown in figure 5.
The calcium carbide slag in the phosphogypsum-slag micro powder-calcium carbide slag system is low-quality waste slag which takes calcium hydroxide as a main component after acetylene gas is obtained by hydrolyzing calcium carbide, and the main components are CaO, CaS and Ca3N2、Ca3P2、Ca2Si、Ca3As2、Ca(OH)2. The content of CaO reaches 87%. And also contains toxic and harmful substances such as sulfide, phosphide and the like. Carbide slag is used as an alkali activator to be compounded and excited with phosphogypsum sulfate to generate a water hardening reaction.
The proportion range of the phosphogypsum-slag micro powder-carbide slag system filling material is as follows: 40-65% of phosphogypsum, 15-40% of slag micro powder and 10-20% of carbide slag; according to the proportion range of the filling material, tests on the strength and the water resistance stability of the filling material cemented filling body of the phosphogypsum-slag micro powder-carbide slag system are carried out, and the test results are shown in table 3.
Table 3: test results of strength and water resistance of filler of phosphogypsum-carbide slag-slag micro powder system
The method adopts a quadratic polynomial regression method to carry out regression analysis on the test data of the strength and the water resistance stability of the cemented filling body of the phosphogypsum-carbide slag-slag micro powder system to establish a 7 d-shaped filler,28d Strength and Water stability of 28d pack K28dThe mathematical model of (a) is as follows:
R7d＝5.93-0.104x1-0.111x2+0.000517x1x1+0.00110x1x2 (1)
R28d＝13.02-0.00175x1x1-0.00907x2x2 (2)
K28d＝1.08-8.39x1+8.28x2+0.084x1x1-0.081x2x2+0.084x1x3-0.083x2x3 (3)
fc＝43.87+2.39x3-0.0037x2x3
in the formula: x is the number of1Represents the phosphogypsum dosage,%; x is the number of2Represents the carbide slag mixing amount,%; x is the number of3Represents the content of slag micro powder. Establishing a proportioning optimization model of a phosphogypsum-carbide slag-slag micro powder system:
Min fc＝Min(43.87+2.39x3-0.0037x2x3) (4)
1.08-8.39x1+8.28x2+0.084x1x1-0.081x2x2+0.084x1x3-0.083x2x3≥0.85 (7)
solving an optimization model of the proportion of the all-solid-waste filling material of the phosphogypsum-carbide slag-slag micro powder system in the formulas (4) to (7) to obtain the optimal proportion of the all-solid-waste filling material as follows: 48% of phosphogypsum, 20% of carbide slag and 32% of slag micro powder. The strength of the cemented filling bodies 7d and 28d is 0.93MPa and 5.25MPa respectively. The water resistance stability factor of the cured 28d pack was 0.86.
Example 2: phosphogypsum-slag micro powder-carbide slag-copper tailings separation system
The proportion of the phosphogypsum-slag micro powder-carbide slag-copper tailings system full-solid waste filling material is optimized, and firstly, the solid waste of the system is dried and ground, and chemical component analysis and particle size test are carried out. The chemical composition of the phosphogypsum of the filling material of the system is shown in the table 4.
Table 4: chemical composition result of phosphogypsum in phosphogypsum-slag micropowder-carbide slag-copper tailings separation system
| Chemical composition | P2O5 | Fe2O3 | Al2O3 | MgO | CaO | SO4 2- | F | Acid insoluble substance |
| Content/% | 1.76 | 0.48 | 0.28 | 2.44 | 30.64 | 53.52 | 0.45 | 6.67 |
The particle size distribution curve of the slag micro powder of the phosphogypsum-slag micro powder-carbide slag-copper tailings system is shown in figure 3, and the content of the slag micro powder-45 mu m fine particles accounts for 81.9 percent; the chemical components of the slag are shown in Table 5, and the mass coefficients
Coefficient of activity
Table 5: chemical components of slag in phosphogypsum-slag micro powder-carbide slag-copper separation tailings system
| Chemical composition | CaO | SiO2 | Al2O3 | MgO | SO3 | Fe2O3 |
| Content/% | 43.51 | 30.68 | 14.03 | 7.35 | 1.32 | 0.72 |
| Chemical composition | TiO2 | MnO | K2O | Na2O | P2O5 | Others |
| Content/% | 0.68 | 0.57 | 0.54 | 0.33 | 0.06 | 0.21 |
The structure diagram of the microcosmic surface morphology of the phosphogypsum is shown in figure 4, and the XRD spectrum of the phosphogypsum is shown in figure 5.
The main components of the calcium carbide slag of the phosphogypsum-slag micro powder-calcium carbide slag-copper tailings system are CaO, CaS and Ca3N2、Ca3P2、Ca2Si、Ca3As2、Ca(OH)2. The CaO content is 87%.
The copper separation tailings in the phosphogypsum-slag micro powder-carbide slag-copper separation tailings system are low-quality solid wastes discharged after copper is separated from copper nickel slag and iron is separated from copper (see figure 6), and the particle size distribution of the copper separation tailings is shown in figure 7.
The proportioning range of the phosphogypsum-slag micro powder-carbide slag-copper separation tailing system full-solid waste filling material is as follows: 40-50% of phosphogypsum, 25-35% of slag micro powder, 10-20% of carbide slag and 5-20% of copper tailings, strength and water-resistant stability tests of the cemented filling body are carried out according to the proportion range of the system, and the test results are shown in Table 6.
Table 6: test results of strength and water resistance of filler of phosphogypsum-carbide slag-slag powder-copper separation tailings system
Regression analysis is carried out on the test data by using quadratic polynomial to establish the strength of 7d and 28d of the cemented filling body and the water resistance stability K of the 28d filling body28dThe mathematical model is as follows:
R7d＝1.76+0.35x1-0.55x2-0.4x3-0.0034x1x1+0.014x2x2-0.004x3x3-0.05x1x2+0.01x1x3 (8)
R28d＝1.86-0.00184x2x2 (9)
K28d＝-30.5+2.19x1-0.69x2-0.021x1x1+0.019x2x2-0.0097x3x3+0.0025x4x4-0.013x1x2-0.0059x1x4 (10)
regression analysis of the filling cost data using a quadratic polynomial to obtain a material cost function fc：
fc＝29.74+2.025x2+0.014x1 x2+0.021x3 x4 (11)
In the formula: x is the number of1Represents phosphogypsumMixing amount,%; x is the number of2Represents the slag micro powder mixing amount,%, x3Represents the carbide slag mixing amount,%, x3Represents the doping amount of copper dressing tailings in percent.
Establishing a material proportion optimization model of a phosphogypsum-slag micro powder-carbide slag-copper separation tailings system:
MinCT＝Min(29.74+2.025x2+0.014x1x2+0.021x3x4 (12)
1.76+0.35x1-0.55x2-0.40x3-0.0034x1x1+0.014x2x2-0.004x3x3-0.05x1x2+0.01x1x3≥0.5 (13)
1.86-0.00184x2x2≥2.5 (14)
-30.5+2.19x1-0.69x2-0.021x1x1+0.019x2x2-0.0097x3x3+0.0025x4x4-0.013x1x2-0.0059x1x4≥0.85 (15)
solving the optimization model of the proportion of the phosphogypsum-slag micropowder-carbide slag-copper tailings system full-solid waste filling material in the formulas (12) to (15), wherein the proportion of the obtained filling material is as follows: 46% of phosphogypsum, 10% of carbide slag, 32% of slag micro-powder and 12% of copper dressing tailings. The strength of the cemented filling bodies 7d and 28d reaches 0.67MPa and 3.80MPa respectively. The 28d filling body has a water stability coefficient of 0.92.
Example 3: phosphogypsum-slag micro powder-carbide slag-fly ash system
The material proportion optimization method of the phosphogypsum-slag micro powder-carbide slag-fly ash system is used for drying and grinding solid wastes in the system, analyzing chemical components and testing particle size.
The chemical components of the phosphogypsum in the filling material of the phosphogypsum-slag micro powder-carbide slag-fly ash system are shown in the table 7.
Table 7: chemical components of phosphogypsum in phosphogypsum-slag micro powder-carbide slag-fly ash system
The particle size distribution curve of the slag micro powder of the phosphogypsum-slag micro powder-carbide slag-fly ash system is shown in figure 3, and the content of the slag micro powder-45 mu m fine particles is 81.9 percent;
the chemical components of the slag are shown in Table 8, and the mass coefficients
Coefficient of activity
Table 8: chemical components of slag in phosphogypsum-slag micro powder-carbide slag-fly ash system
| Chemical composition | CaO | SiO2 | Al2O3 | MgO | SO3 | Fe2O3 |
| Content/% | 43.51 | 30.68 | 14.03 | 7.35 | 1.32 | 0.72 |
| Composition (I) | TiO2 | MnO | K2O | Na2O | P2O5 | Others |
| Content/% | 0.68 | 0.57 | 0.54 | 0.33 | 0.06 | 0.21 |
The microstructure diagram of the phosphogypsum is shown in figure 4, and the XRD spectrum of the phosphogypsum is shown in figure 5.
The main components of the carbide slag in the phosphogypsum-slag micro powder-carbide slag-fly ash system are CaO, CaS and Ca3N2、Ca3P2、Ca2Si、Ca3As2、Ca(OH)2. The CaO content is 87%.
The chemical components of the fly ash in the phosphogypsum-slag micropowder-carbide slag-fly ash system are shown in a table 9, an XRD diffraction pattern is shown in a figure 8, and a particle size distribution diagram is shown in a figure 9.
TABLE 9 chemical composition analysis results of fly ash from thermal power plant
| Chemical composition | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | K2O+Na2O |
| Content/% | 48.76 | 16.22 | 23.91 | 2.05 | 1.44 | 0.89 | 1.59 |
The proportioning range of the phosphogypsum-slag micro powder-carbide slag-fly ash system full-solid waste filling material is as follows: 40-50% of phosphogypsum, 25-35% of slag micro powder, 10-15% of carbide slag and 5-20% of fly ash. Tests on the strength and the water-resistant stability of the filler are carried out according to the proportion range of the phosphogypsum-slag micro powder-carbide slag-fly ash system, and the test results are shown in the table 10.
Table 10: test results of strength and water resistance of filler of phosphogypsum-carbide slag-slag micropowder-fly ash system
Performing regression analysis on the strength and water-resistant stability test data of the filler of the phosphogypsum-slag micropowder-carbide slag-fly ash system by using a quadratic polynomial regression analysis method to establish the strength of 7d and 28d cemented fillers and the water-resistant stability coefficient K of 28d fillers28dThe mathematical model of (a) is as follows:
R7d＝40.2-0.51x1-2.22x2+0.66x3+0.0086x1x1+0.051x2x2-0.020x3x3-0.012x1x2+0.009x1x3-0.021x2x3 (16)
R28d＝-85.96+4.29x1+0.20x2-2.46x3-0.053x1x1-0.01x2x2+0.03x3x3+0.01x1x2+0.035x1x3+0.0033x2x3 (17)
K28d＝44.96+0.16x1-3.31x2+0.052x1x1-0.0079x3x3-0.011x1x4+0.0038x2x2+0.015x2x4+0.0058x3x4 (18)
adopting a quadratic polynomial regression analysis method to carry out regression analysis on the phosphogypsum-slag micro powder-carbide slag-fly ash system filling material cost data to establish a filling material cost model fc：
fc＝41.29+2.40x2+0.0098x1x4 (19)
In the formula: x is the number of1Represents phosphogypsum,%; x is the number of2Represents slag micropowder,%, x3Represents carbide slag,%, fly ash 100% -x1-x2-x3。
Establishing a phosphogypsum-slag micro powder-carbide slag-fly ash system material proportion optimization model:
MinCT＝Min(41.29+2.40x2+0.0098x1x4) (20)
40.2-0.51x1-2.22x2+0.66x3+0.0086x1x1+0.051x2x2-0.020x3x3≥0.5 (21)
-85.96+4.29x1+0.20x2-2.46x3-0.053x1x1-0.01x2x2+0.03x3x3+0.01x1x2+0.035x1x3+0.0033x2x3≥2.5 (22)
44.96+0.16x1-3.31x2+0.052x1x1-0.0079x3x3-0.011x1x4+0.0038x2x2+0.015x2x4+0.0058x3x4≥0.85 (23)
solving an optimization model of the proportion of the phosphogypsum-slag micropowder-carbide slag-fly ash system in the formulas (20) to (23), and obtaining the optimal proportion of the filling material as follows: 46% of phosphogypsum, 26% of carbide slag, 12% of slag micro-powder and 16% of fly ash. The strength of the fillers 7d and 28d was 1.13MPa and 3.50MPa, respectively. The 28d pack had a water stability factor of 0.88.
Aiming at the requirements of safe production of a large water mine on the water resistance stability of a filling body and the water soaking weakening characteristic of a full-solid waste filling body, the invention provides a proportioning optimization method of a full-solid waste filling material. The key technology of the invention is to optimize the proportion of the full-solid-waste filling material by establishing an optimization model, realize the proportion optimization combination and the synergistic effect of various solid wastes, prepare the full-solid-waste filling material with water-resistant stability, and explore a way for the resource utilization of low-quality solid wastes in filling mining of large-water mines.
The method for optimizing the proportion of the all-solid-waste filling material with the water stability resistance of the large water mine provided by the embodiment of the application is described in detail. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. A method for optimizing the proportion of a full-solid waste filling material with water stability resistance of a large water mine is characterized by comprising the following steps:
s1, drying and grinding the solid waste material to obtain a plurality of mixed powder with different proportions; the mixed powder comprises phosphogypsum and blast furnace slag;
s2, performing a filler strength test and a water resistance test on all the mixed powder obtained in the step S1 to obtain filler strength test results and water resistance test results of the mixed powder with different proportions;
s3, establishing a mathematical model of the strength of the filling body and a mathematical model of the water-resistant stability according to the strength test result and the water-resistant performance test result of the filling body obtained in the step S2;
s4, establishing a full-solid waste filling material ratio optimization model by taking the filling material cost as an optimization target and taking the filling body strength mathematical model and the water-resistant stability mathematical model obtained in the step S3 as constraint conditions;
and S5, solving the all-solid-waste filling material ratio optimization model obtained in the S4 to obtain the optimized ratio of the all-solid-waste filling material.
2. The method for optimizing the proportion of the large water mine water stability full-solid waste filling material according to claim 1, wherein the parameter requirements of the phosphogypsum comprise: p2O5Less than or equal to 5 percent, the water content is less than or equal to 3 percent, MgO is less than or equal to 3 percent, and the specific surface area is more than or equal to 200m2/kg。
3. The method for optimizing the proportion of the full-solid waste filling material with the water stability of the large water mine according to claim 1, wherein the parameter requirements of the blast furnace slag comprise: the fineness of the blast furnace slag micro powder is less than or equal to 5 percent or the specific surface area is more than or equal to 420m2Kg, mass coefficient not less than 1.6, activity index not less than 0.3 and water content<3％。
4. The method for optimizing the proportion of the full-solid waste filling material with the water stability of the large water mine according to claim 1, wherein the mixed powder further comprises one or more of carbide slag, fly ash and copper tailings.
5. The method for optimizing the proportion of the water stability resistant all-solid-waste filling material in the large water mine according to claim 4, wherein the parameter requirements of the carbide slag, the fly ash and the copper tailings comprise: water content ratio<3 percent and the specific surface area is more than or equal to 300m2/kg。
6. The method for optimizing the proportion of the full-solid waste filling material with the water stability of the large water mine according to claim 4, wherein the mixed powder comprises the following components in percentage by mass when the mixed powder comprises phosphogypsum, blast furnace slag and carbide slag: 40-65% of phosphogypsum, 15-40% of blast furnace slag and 10-20% of carbide slag;
the mixed powder comprises the following components in percentage by mass when the mixed powder comprises phosphogypsum, blast furnace slag, carbide slag and copper tailings: 40-50% of phosphogypsum, 25-35% of blast furnace slag, 10-15% of carbide slag and 5-20% of copper dressing tailings;
the mixed powder comprises the following components in percentage by mass when the mixed powder comprises phosphogypsum, blast furnace slag, carbide slag and fly ash: 40-50% of phosphogypsum, 25-35% of blast furnace slag, 10-15% of carbide slag and 5-20% of fly ash.
7. The method for optimizing the proportion of the full-solid waste filling material for the water resistance stability of the large water mine according to claim 1, wherein the water resistance test and the water resistance test result are obtained by a method comprising the following steps: preparing two groups of filling body test blocks, and respectively placing the two groups of filling body test blocks in water and a curing box for curing; and testing the uniaxial compressive strength of the two groups of the filling body test blocks, and taking the ratio of the uniaxial compressive strength of the filling body test blocks under two curing conditions as the water resistance test result of the mixed powder.
8. The method for optimizing the proportion of the full-solid waste filling material for the water stability of the large water mine according to claim 1, wherein in the step S3:
performing regression analysis on the filling body strength test result by using a quadratic polynomial to establish mathematical models of the strengths of the cemented filling bodies 7d and 28 d;
and (4) performing regression analysis on the water resistance test result by using a quadratic polynomial, and establishing a water resistance stability mathematical model of the 28d filling body.
9. The method for optimizing the proportion of the full-solid waste filling material with the water stability of the large water mine according to claim 8, wherein the mathematical models of the strengths of the cemented filling bodies 7d and 28d are as follows:
R7d＝f1(x1,x2,···，xn)、R28d＝f2(x1,x2,···，xn)；
wherein R is7d、R28dRepresenting the strength of the filling bodies 7d, 28 d; x is the number of1,x2,···，xnRepresenting the proportion of the total solid waste filling material; f. of1、f2Representing the relation function of the strength of the filling bodies 7d and 28d and the solid waste mixing amount;
the water-resistant stability mathematical model is as follows:
K28d＝f3(x1,x2,···，xn)；
wherein, K28dRepresenting the water stability factor, x, of cured 28d pack1,x2,···，xnRepresenting the ratio of the total solid waste filling material, f3Representing the water stability factor and the amount of solid waste added of 28d packA relationship function.
10. The method for optimizing the proportion of the all-solid-waste filling material for the water stability of the large water mine according to claim 9, wherein the all-solid-waste filling material proportion optimization model in the step S4 includes:
optimizing the target: MinCT＝Minfc(x1,x2,···，xn)；
Constraint conditions are as follows: r7d＝f1(x1,x2,···，xn)≥[R7d]
R28d＝f2(x1,x2,···，xn)≥[R28d]
K28d＝f3(x1,x2,···，xn)≥[K28d]；
Wherein, CTRepresenting the total solid waste filling material cost, fc(x1,x2,···，xn) As a function of filling material cost;
[R7d]、[R28d]represents the design value of the strength of the fillers 7d, 28d, [ K ]28d]Represents the design value of the water stability factor of the 28d pack.
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| CN115504753A (en) * | 2022-10-08 | 2022-12-23 | 昆明理工大学 | Phosphogypsum-based mine filling cementing material |
| CN117253569A (en) * | 2023-11-16 | 2023-12-19 | 河北省建筑科学研究院有限公司 | Batching calculation method of all-solid waste cementing material |
| CN117253569B (en) * | 2023-11-16 | 2024-02-06 | 河北省建筑科学研究院有限公司 | Batching calculation method of all-solid waste cementing material |
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