CN111324950B - Design method of low-cost composite excitation filling cementing material - Google Patents
Design method of low-cost composite excitation filling cementing material Download PDFInfo
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Abstract
The invention discloses a design method of a low-cost composite excitation filling cementing material, and belongs to the technical field of filling mining. The method adopts high-temperature maintenance to carry out a strength orthogonal test on the cemented filling body, and quickly obtains a base activator and an optimized formula of the base activator; then carrying out compound excitant proportioning orthogonal design and cemented filling body strength test; and establishing and solving a compound activator ratio optimization design model according to the test result to obtain a compound activator optimized formula, thereby preparing the low-cost compound excitation filling cementing material. The design method can quickly obtain the low-cost filling cementing material excitant optimized formula aiming at the physicochemical characteristics of different solid wastes, so that the low-cost filling cementing material suitable for different tailings aggregates and strength requirements is prepared, and a foundation is laid for large-scale and high-added-value resource utilization of various solid wastes in filling mining.
Description
Technical Field
The invention belongs to the technical field of filling mining, and particularly relates to a design method of a low-cost composite excitation filling cementing material.
Background
With the rapid development of national economy and the continuous development of resources, resources with high grade and good conditions are gradually exhausted, and more difficult-to-mine ore bodies with deep burial depth, large ground pressure, rich water and the like are faced to be exploited. For safe, environment-friendly and green mining, a filling mining method is the primary choice. The stoping process of the filling mining method is complex, the production capacity is low, and the mining cost is high. Therefore, the development and utilization of the low-cost and high-performance filling cementing material are the necessary way for improving the economic benefit and the environmental protection benefit of filling mining.
For over 10 years, people are always exploring and utilizing various industrial solid wastes such as slag, steel slag, desulfurized gypsum and the like to prepare a novel filling cementing material with low cost and high strength. The research result shows that: the smelting industrial waste residue after high-temperature calcination and water quenching has potentially different degrees of water hardening activity. The activity of the slag is closely related to the type of metallurgical slag, mineral composition and the treatment process of the discharge process. Therefore, the potential activity of the waste residues of different types of solid wastes and different treatment processes of the same solid wastes has great difference and uncertainty, thereby bringing technical problems to the resource utilization of industrial solid wastes. The filling cementing material developed by utilizing industrial solid wastes at present is mainly prepared by mechanical grinding (force excitation) and a chemical excitant. Therefore, the grinding fineness of the solid waste materials, the exciting agent and the formula not only influence the performance of the cementing material (the strength of a filling body and the fluidity of slurry), but also determine the cost of the filling cementing material. Obviously, the more fine the solid waste powder is, the higher the activity is, but the powder grinding cost is increased along with the increase of the powder grinding fineness. The chemical activator mainly comprises a salt-based activator mainly comprising sulfate, a base activator mainly comprising calcium oxide and a composite activator prepared from alkali salt. Undoubtedly, the activator material and the formula not only affect the performance of the filled cementing material, but also relate to the cost of the filled cementing material, and are key technologies for preparing low-cost filled cementing materials based on multiple solid wastes.
Chinese invention patents CN103613294A, CN104609749A and CN103787601A disclose a formula of a composite excitation material mainly developed by slag and filled with a gelled material and a preparation method thereof; CN102249611A, CN102633448A, CN103043975A, CN103102089A, CN106565187B and CN107352825A invent a formula and a preparation method of a filling cementing material for metal mine beneficiation tailing aggregate; CN103803826A, CN103803928A and CN 103803929A disclose formulations of consolidated powder filled cementitious materials for bar sanding and mixed aggregates; CN107540302A discloses a formula for preparing a filling cementing material by using low-quality solid wastes such as steel slag, loess and phosphogypsum; CN102234191A, CN108178597A and CN110054423A invent early strength filling cementitious material formulas suitable for mining by a downward stratified filling method; CN 102924005A and CN 108439910A disclose filled cementitious formulations with micro-expansion; CN108240233A invents the proportion of the filling cementing material prepared by the cement synergist; for coal gangue mixed coarse aggregate and filling coal mining technology, CN105152601A, CN105753418A, CN107619249A, CN107805023A and CN108083701A provide a filling cementing material proportioning and preparation method; CN110218010A also discloses a method for preparing the filling cementing material by calcining the mixture of steel slag, ash and the like.
In conclusion, the characteristics of the invention are as follows: discloses a formula of a filling cementing material and a preparation method thereof aiming at specific solid wastes. The disclosed exciting agent material and the proportion are only limited to specific purposes and specific conditions, the development of multi-solid waste filling cementing materials is not suitable, and the optimal formula of the composite exciting agent for filling mine tailings is difficult to obtain.
Different from building gelled materials, the filling gelled materials are developed based on metallurgical slag, various complex and variable solid waste resources with uncertain factors are involved, and filling gelled materials with excellent performance and low cost can be obtained only by optimizing the design of filling gelled material excitants and formulas.
Disclosure of Invention
Aiming at the current development situation and the existing problems of the filling cementing material, the invention provides a design method of a low-cost composite excitation filling cementing material.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a design method of a low-cost composite excitation filling cementing material comprises the following steps:
(1) the formula design of the salt-based excitant comprises the following steps: preparing a salt-based activator cementing material by taking a sulfate activator as a main material and a base activator as an auxiliary material, adding a filling aggregate to prepare a cemented filling body, performing orthogonal tests on the 3d and 7d strength of the cemented filling body under a high-temperature curing condition, and designing a formula of the salt-based activator by adopting range analysis, thereby obtaining an optimized formula of the salt-based activator.
(2) Base excitant formula design: preparing a basic group activator cementing material by taking a basic group activator as a main material and a sulfate activator as an auxiliary material, adding a filling aggregate to prepare a cemented filling body, performing orthogonal tests on the 3d and 7d strength of the cemented filling body under a high-temperature curing condition, and designing a basic group activator formula by adopting range analysis, thereby obtaining an optimized basic group activator formula.
(3) Establishing a relation model of the strength of a cemented filling body, the cost of a filling cementing material and a composite excitant: obtaining a base exciting agent optimized formula and a base exciting agent optimized formula according to the steps (1) and (2) to determine a compound exciting agent formula, carrying out a strength orthogonal test on the cemented filling bodies of 7d and 28d under a standard curing condition to obtain a test result of the strength of the cemented filling bodies, carrying out stepwise regression analysis on the test result by using a quadratic polynomial, and establishing a relation model of the strength of the cemented filling bodies and the proportion of the compound exciting agent:
R 7d=F 1 (X)、R 28d=F 2 (X)
in the formula (I), the compound is shown in the specification,R 7drepresenting the strength of the cemented filling mass 7d,F 1 (X) Representing a cemented filling body 7d strength model;R 28drepresents the strength of the cemented filling body 28 d;F 2 (X) Representing a cemented pack 28d strength model;
establishing a filled cementing material cost model according to the raw material cost of the filled cementing material and the ratio of the filled cementing material:C T= F 3(X)；
in the formula (I), the compound is shown in the specification,C Trepresents the cost of the filled cementitious material;F 3(X) Representing a filled cementitious material cost model;
X ={x 1, x 2,…, x n}Trepresenting the filling cement composite excitant variable.
(4) The cost of the composite excited filling cementing material is taken as an optimization target, the strength of the cemented filling bodies 7d and 28d is taken as a constraint condition, and a low-cost filling cementing material proportion optimization model is established as follows:
optimizing the target:MinC T = Min F 3(X)
constraint conditions are as follows:R 7d=F 1 (X)≥[R 7d]；R 28d=F 2 (X)≥[R 28d]
in the formula (2)R 7d]、[R 28d]Designing strength indexes for the cut-and-fill cemented filling bodies 7d and 28d respectively;
and solving the optimization model to obtain the optimized formula of the composite exciting agent with the lowest cost of the filling cementing material, thereby preparing the low-cost composite exciting filling cementing material meeting the mining requirement of a filling method.
In the step (1), the formula of the salt-based activator cementing material is as follows: 13-17wt% of sulfate excitant, 2-6wt% of base excitant, 0-1.0 wt% of industrial mirabilite and the balance of slag micro powder.
In the step (2), the base activator cementing material formula is as follows: 8-12wt% of basic group excitant, 2-6wt% of sulfate excitant, 0-1.0 wt% of industrial mirabilite and the balance of slag micropowder.
In the steps (1) and (2), the sulfate excitant is desulfurized gypsum, and the sulfate excitant powder has water content<8wt%、SO3Content (wt.)>38wt% and fineness of powder<15%。
In the steps (1) and (2), the basic group excitant is cement clinker and quicklime, the water content of the basic group excitant powder is less than 3wt%, the CaO content is more than 80wt%, and the fineness of the powder is less than 5%.
In the steps (1) and (2), the high-temperature curing condition is that the temperature is 38-42 ℃ and the humidity is more than or equal to 95%.
In the step (3), the proportion of the sulfate excitant in the compound excitant formula is up-down floated by 1-2% according to the proportion of the sulfate excitant in the base excitant optimized formula in the step (1) to determine a test range, and the proportion of the base excitant in the base excitant optimized formula in the step (2) is up-down floated by 1-2% to determine a test range; i.e. A = A1±（1-2%），B=B2±（1-2%）；
A is the proportion of sulfate excitant in the formula of the composite excitant, A1Optimizing the proportion of the sulfate excitant in the formula for the base excitant in the step (1); b is the base activator proportion in the formula of the compound activator, B2Optimizing the proportion of the base exciting agent in the formula for the base exciting agent in the step (2);
the invention also comprises the step of carrying out strength verification and cost analysis on the cemented filling body of the formula of the composite excited filling cementing material obtained in the step (4).
In the step (3) of the invention, the method for detecting the strength of the cemented filling body refers to the method for detecting the strength of cement mortar in GB/T17671-1999 (ISO method).
The beneficial effect that this technical scheme produced lies in: aiming at the complex variability of the physical and chemical characteristics of the current solid waste, the method adopts high-temperature curing to quickly obtain two types of basic and basic excitant optimized formulas, so that the formula range of the low-cost excitant material is designed, and the design of the cemented filling body strength test scheme is carried out for the optimized design of the composite excited filling cementing material formula. At present, the development of the novel cementing material usually adopts a trial-and-error method, namely, a trial-and-error method test of different excitant material formula schemes is carried out by means of the experience of researchers. Not only is it difficult to obtain a reasonable range of the excitant formula due to the difference of the experience of designers; meanwhile, the strength test of the cemented filling body is carried out based on a multi-trial-and-error method, so that the test workload is large, and the optimal formula is difficult to obtain. By adopting a high-temperature maintenance test and 3d and 7d strength tests of the cemented filling body, the maintenance condition can accelerate the hydration reaction rate of the cementing material and shorten the strength test time of the cemented filling body of the cementing material. When the low-cost cementing material optimization formula decision is made, the strength of the cemented filling body needs to meet the strength requirement of the cemented filling body, so that the strength tests of the cemented filling bodies 7d and 28d are carried out under the standard curing condition, and a cementing material optimization model is established according to the constraint condition for optimization design. In conclusion, the design method disclosed by the invention can quickly obtain the optimized formula of the composite exciting agent aiming at solids with different physical and chemical properties, lays a foundation for the application of solid waste in filling mining, and thus obtains remarkable benefits and environmental protection benefits.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a slag micropowder particle size distribution curve of example 1;
FIG. 2 is a particle size distribution curve of desulfurized gypsum of example 1;
FIG. 3 is a particle size distribution curve of cement clinker of example 1;
FIG. 4 is the particle size distribution curve of the whole tailings of a certain iron ore in Hebei of example 1.
Detailed Description
The design method of the low-cost composite excitation filling cementing material adopts high-temperature maintenance to quickly obtain a base exciting agent and a base exciting agent optimized formula; then, under the standard nutrient condition, carrying out orthogonal design of the proportion of the composite exciting agent and a strength test of the cemented filling body; on the basis, establishing a compound excitant optimization model for proportioning optimization; finally, performing a strength verification test on the cemented filling body and performing economic analysis on the filled cementing material. The implementation scheme specifically comprises the following steps:
1. formulation design of salt-based excitant
(1) According to available salt-based activator materials, determining the salt activator as industrial by-product gypsum, preferably desulfurized gypsum; water content of sulfate activator powder<8wt%、SO3Content (wt.)>38wt% and fineness of powder<15%；
(2) The proportion of the salt-based excitant is as follows: 13-17wt% of base exciting agent, 2-6wt% of alkali exciting agent, 0-1.0 wt% of industrial mirabilite and the balance of slag micropowder.
(3) Preparing a base-excited filling cementing material by taking a sulfate excitant as a main material and a base excitant as an auxiliary material, adding a filling aggregate to prepare a cemented filling body, curing at the high temperature of 38-42 ℃ and under the condition that the humidity is more than or equal to 95%, and performing 3d and 7d strength orthogonal tests on the cemented filling body of the salt-excited cementing material to obtain a strength test result of the cemented filling body;
(4) and (3) rapidly optimizing the formula of the salt-based excitant with the strengths of 3d and 7d of the cemented filling body by adopting range analysis according to the strength test result of the cemented filling body, thereby obtaining the optimized formula of the salt-based excitant.
2. Formulation design of basic group excitant
(1) According to available basic activator materials, the basic activator is cement clinker, quicklime or other basic materials, preferably cement clinker; the water content of the base activator powder is less than 3wt%, the CaO content is more than 80wt%, and the fineness of the powder is less than 5%;
(2) the base activator comprises the following components in percentage by weight: 8-12wt% of basic group excitant, 2-6wt% of sulfate excitant, 0-1.0 wt% of industrial mirabilite and the balance of slag micro powder;
(3) preparing a basic group-excited filling cementing material by taking a basic group exciting agent as a main material and a sulfate exciting agent as an auxiliary material, adding a filling aggregate to prepare a cemented filling body, curing at the high temperature of 38-42 ℃ and the humidity of more than or equal to 95%, and performing 3d and 7d strength orthogonal tests on the cemented filling body of the basic group-excited cementing material to obtain a strength test result of the cemented filling body;
(4) and (3) rapidly optimizing the base activator formula of the 3d and 7d strength of the cemented filling body by adopting range analysis according to the strength test result of the cemented filling body, thereby obtaining the optimized base activator formula.
3. Model for establishing strength of cemented filling body and cost of composite excitation filling cementing material
(1) Obtaining optimized formulas of a basic exciting agent and a basic exciting agent according to the steps 1 and 2, determining the formula range of the composite exciting agent, performing strength orthogonal test design on the cemented filling body, performing 7d and 28d strength tests on the cemented filling body under the standard curing condition that the temperature is 22 +/-2 ℃ and the humidity is more than or equal to 95%, and obtaining the strength test result of the cemented filling body by referring to the standard GB/T17671-1999 cement mortar strength test method (ISO method); the proportion of the sulfate excitant in the formula of the composite excitant is A = A1+/- (1-2%) base trigger ratio B = B2±（1-2%）；A1Optimizing the proportioning of the sulfate excitant in the formula for the salt-based excitant in the step 1, B2Optimizing the proportion of the base exciting agent in the formula for the base exciting agent in the step 2;
(2) performing stepwise regression analysis on the test result of the strength of the cemented filling body by using a quadratic polynomial, and establishing a relation model of the strength of the cemented filling body and the proportion of the composite exciting agent:
R 7d=F 1 (X)、R 28d=F 2 (X)
in the formula (I), the compound is shown in the specification,R 7drepresenting the strength of the cemented filling mass 7d,F 1 (X) Representing a strength relation model of the cemented filling body 7 d;R 28drepresents the strength of the cemented filling body 28 d;F 2 (X) Representing a strength relationship model of the cemented filling mass 28 d;
(3) according to the raw material cost of the filling cementing material and the proportion of the composite exciting agent filling cementing material, establishing a filling cementing material cost model:C T = F 3(X)
in the formula (I), the compound is shown in the specification,C Trepresents the cost of the filled cementitious material;F 3(X) Representing a filled cementitious material cost model.
4. Establishing an optimization model of a low-cost filling cementing material composite exciting agent
(1) Establishing a low-cost composite excitation filling cementing material proportion optimization model by taking the cost of the composite excitation filling cementing material as an optimization target and taking the strengths of the cemented filling bodies 7d and 28d as constraint conditions:
optimizing the target:MinC T = Min F 3(X)
constraint conditions are as follows:R 7d=F 1 (X)≥[R 7d]；R 28d=F 2 (X)≥[R 28d]
in the formula (2)R 7d]、[R 28d]Designing strength indexes for the cut-and-fill cemented filling bodies 7d and 28d respectively;
(2) and solving the optimization model to obtain the optimized formula of the composite exciting agent which meets the strength requirement of the mining cemented filling body by a filling method and has the lowest cost of the cementing material, thereby preparing the low-cost filling cementing material.
5. Formula verification test and economic analysis of low-cost filling cementing material
(1) Performing a strength verification test on the cemented filling body aiming at the low-cost composite excited filling cementing material obtained in the step 4;
(2) and according to the verification test result, carrying out low-cost composite excitation filling cementing material cost analysis by combining a filling mine mining method, a stoping process and technical parameters.
Example 1
Aiming at the whole tailings of a certain iron ore in Hebei, the method for designing the low-cost filling cementing material for mining by a subsequent filling method in the stage of preparing the certain iron ore in Hebei through compound excitation comprises the following steps:
1. formulation design of salt-based excitant
Aiming at the filling aggregate of the whole tailings of certain iron ores in Hebei, desulfurized gypsum is selected as a main excitant, cement clinker is selected as an auxiliary excitant, and industrial mirabilite is added as an early strength agent to excite the potential activity of the slag micro powder.
The fineness of the slag micropowder in the embodiment is 4.27%, and the particle size distribution curve is shown in fig. 1; the water content of the desulfurized gypsum powder is 9.5wt percent and SO3The content is 39.5wt%, the fineness of the powder is 9.2%, and the particle size distribution curve is shown in figure 2; the cement clinker powder has a water content of 2.7wt%, a CaO content of 86.8wt% and a fineness of 4.5%, and a particle size distribution curve is shown in FIG. 3; the content of 200-mesh fine particles in the iron ore full tailings reaches 78%, and the particle size distribution curve is shown in figure 4.
According to experience, the mixing ratio range of the main exciting agent desulfurized gypsum of the basic exciting agent is 13-17wt%, the mixing ratio range of the auxiliary exciting agent cement clinker is 2-6wt%, 0-1wt% of industrial mirabilite is added, the mortar ratio is 1:4 (namely the ratio of the filling cementing material to the whole tailing filling aggregate) and the filling slurry concentration is 64%, the basic exciting agent formula is orthogonally designed, the rapid curing is carried out under the conditions of 40 ℃ high temperature and humidity being more than or equal to 95%, the 3d and 7d strength tests of the cemented filling body are carried out, and therefore the 3d and 7d uniaxial compressive strength test results of the cemented filling body of the basic exciting filling cementing material are obtained, and the test results are shown in table 1.
Table 2 shows the worst analysis results of the strength orthogonal test of the cement filler of the salt-based excited filled cementitious material. Therefore, the optimal formula of the base exciting agent for 3d strength of the cemented filling body is 4wt% of cement clinker, 14wt% of desulfurized gypsum and 0.5wt% of industrial mirabilite; the optimal formula of the 7 d-strength salt-based excitant is 4wt% of cement clinker, 16wt% of desulfurized gypsum and 0.5wt% of industrial mirabilite; the optimized formula of the salt-based excitant with the strength of the 2-age cemented filling bodies is integrated, so that the optimized formula of the salt-based excitant is determined to be 4wt% of cement clinker, 15wt% of desulfurized gypsum and 0.5wt% of industrial mirabilite; the fine slag powder was 80.5 wt%.
Table 1: orthogonal test result of strength of base-excited filling cementing material cemented filling body under high-temperature curing condition
Table 2: extremely poor analysis result of salt-based excited filling cementing material cemented filling body strength orthogonal test under high-temperature curing condition
2. Formulation design of basic group excitant
Aiming at the filling aggregate of the whole tailings of certain iron ores in Hebei, cement clinker is used as a main excitant, desulfurized gypsum is used as an auxiliary excitant, and industrial mirabilite is added as an early strength agent to excite the potential activity of slag micro powder.
According to experience, the proportioning range of the cement clinker of the main excitant is 8-12wt%, the proportioning range of the desulfurized gypsum of the auxiliary excitant is 2-6wt%, 0-1wt% of industrial mirabilite is added, the glue-sand ratio is 1:4 and the slurry concentration is 64%, the base excitant formula is orthogonally designed, rapid curing is carried out under the conditions that the temperature is 40 ℃ and the humidity is more than or equal to 95%, the 3d and 7d strength tests of the cemented filling bodies are carried out, and therefore the 3d and 7d uniaxial compressive strength test results of the cemented filling bodies of the base excited filling cementitious material are obtained, and the test results are shown in table 3.
Table 4 shows the results of the worst analysis of the strength orthogonal test of the cemented filling body of the base excited filling cement. Therefore, the optimal formula of the base exciting agent for 3d strength of the cemented filling body is 12wt% of cement clinker, 4wt% of desulfurized gypsum and 1wt% of industrial mirabilite; the optimal formula of the 7 d-strength base-based excitant is 10wt% of cement clinker, 4wt% of desulfurized gypsum and 0wt% of industrial mirabilite. The optimized formula of the base exciting agent with the strength of the 2-age cemented filling bodies is integrated, and the optimized formula of the base exciting agent is determined to be 10wt% of cement clinker, 4wt% of desulfurized gypsum and 0wt% of industrial mirabilite; the fine slag powder was 86 wt%.
Table 3: base excited filling cementing material cementing body filling strength orthogonal test result under high-temperature curing condition
Table 4: extremely poor analysis result of base excited filling cementing material cemented filling body strength orthogonal test under high-temperature curing condition
3. Model for establishing strength of cemented filling body and cost of filling cementing material
According to the optimized formula of the base and the basic activator obtained in the steps 1 and 2, the alkali activator cement clinker ranges from 8wt% to 12wt%, the salt activator desulfurized gypsum ranges from 13 wt% to 17wt%, and the industrial mirabilite ranges from 0wt% to 12wt% according to 2% of interval fluctuation. The strength of the cemented packings was orthogonally tested at 7d and 28d using a 1:8 mortar ratio and a 66% slurry concentration under standard curing conditions, and the results of the tests on the strength of the cemented packings are shown in Table 5. According to the test results of table 5 and the raw material cost of the filled cement, a model of the strength of the cemented filling body and the cost of the filled cement is established as follows:
R 7d=-0.159-0.00338x2x2+0.0139x1x2
R 28d=0.216+0.258x1 +0.0397x2 -0.0275x1x1-0.0119x2x2+0.0247x1x2
C T=580.58-85.83x1 -107.43x2 +1.31x2x2+9.79x1x2
wherein x is1Representing the proportion of cement clinker in the composite excitation filling cementing material by weight percent;
x2representing the weight percent of the desulfurized gypsum in the composite excited filling cementing material.
Table 5: orthogonal test result of filling strength of composite excitation filling cementing material cement under standard maintenance condition
4. Establishing and solving low-cost filling cementing material excitant formula optimization model
The design strength of mining cemented filling bodies 7d and 28d in a certain iron ore stage subsequent filling method in Hebei is as follows: [R 7d][ 2 ] =1.0MPa and [ ]R 28d]=3.0 MPa. The method comprises the following steps of establishing a low-cost filling cementing material composite exciting agent ratio optimization model by taking the cost of the composite exciting filling cementing material as an optimization target and taking the strength of cemented filling bodies 7d and 28d as constraint conditions as follows:
optimizing the target:MinC T=Min（580.58-85.83x1 -107.43x2 +1.31x2x2+9.79x1x2）
constraint conditions are as follows:R 7d=-0.159-0.00338x2x2+0.0139x1x2≥1.0MPa
R 28d=0.22+0.26x1 +0.040x2-0.028x1x1-0.012x2x2+0.025x1x2≥3.0MPa
solving the optimal model for the proportion of the composite exciting agent of the filled cementing material to obtain the optimal formula of the composite exciting agent with the lowest cost of the filled cementing material of the whole tailings aggregate of the iron ore in Hebei: 10wt% of cement clinker and 15wt% of desulfurized gypsum; the formula of the iron ore full tailing filling cementing material in Hebei is determined to be 10wt% of cement clinker, 15wt% of desulfurized gypsum and 75wt% of slag micro powder, and the ratio of the composite exciting agent to the slag micro powder is 1: 3.
Low cost filling cementing material verification test and economic analysis
And (4) preparing the whole tailing filling cementing material of the iron ore in Hebei according to the exciting agent optimized formula obtained in the step (4). The glue-sand ratio is 1:4 and 1:8, the mass concentration of the slurry is 66 percentThe cement was filled for verification test, and the results of the verification test were obtained as shown in Table 6. Therefore, when the glue-sand ratio is 1:4, the strength of the 28d of the iron ore full-tailing cemented filling body in Hebei reaches 4.91MPa>[R28d]Designing the strength to meet the strength requirement of a stage subsequent mining cemented filling body; when the glue-sand ratio is 1:8, the strength of the cemented filling body 28d reaches 1.54 MPa. The strength of the low-cost filling cementing material of the present embodiment with the mortar ratio of 1:8 is equivalent to that of the 42.5 cement cementing material of the mortar ratio of 1:4, and the cost of the cementing material is only 1/2 of that of the 42.5 cement cementing material. Obviously, the cement filling material of the embodiment has low cost and high strength of the cemented filling body.
Table 6: strength verification test and material cost of iron ore full-tailing composite excitation filling cementing material cementing filling body
Claims (9)
1. A design method of a low-cost composite excitation filling cementing material is characterized by comprising the following steps:
(1) preparing a base activator filling cementing material by taking a sulfate activator as a main part and a base activator as an auxiliary part, adding a filling aggregate to prepare a cemented filling body, and performing orthogonal tests on the 3d and 7d strength of the cemented filling body under the high-temperature curing condition; designing a formula of a base exciting agent by adopting a range analysis method of an orthogonal test, thereby obtaining an optimized formula of the base exciting agent;
(2) preparing a basic group activator filling cementing material by taking a basic group activator as a main part and a sulfate activator as an auxiliary part, adding a filling aggregate to prepare a cemented filling body, and performing orthogonal tests on the 3d and 7d strength of the cemented filling body under the high-temperature curing condition; designing a base excitant formula by adopting a range analysis method of an orthogonal test, thereby obtaining an optimized formula of the base excitant;
(3) obtaining a base activator optimized formula and a base activator optimized formula according to the steps (1) and (2), determining the orthogonal test design of the composite activator formula of the filling cementing material, and performing 7d and 28d strength orthogonal tests on the cemented filling body under the standard curing condition; and (3) performing stepwise regression analysis on the test data by using a quadratic polynomial, and establishing a cemented filling body strength model:
R 7d=F 1 (X)、R 28d=F 2 (X)
in the formula (I), the compound is shown in the specification,R 7drepresenting the strength of the cemented filling mass 7d,F 1(X) Representing a cemented filling body 7d strength model;R 28drepresents the strength of the cemented filling body 28 d;F 2(X) Representing a cemented pack 28d strength model;
establishing a filled cementing material cost model according to the raw material cost of the filled cementing material and the ratio of the filled cementing material:C T=F 3(X)
in the formula (I), the compound is shown in the specification,C Trepresents the cost of the filled cementitious material;F 3(X) Representing a filled cementitious material cost model;
X ={x 1, x 2, …, x n}Trepresenting a filling cementing material composite excitant variable;
(4) the cost of the composite excited filling cementing material is taken as an optimization target, the strength of the cemented filling bodies 7d and 28d is taken as a constraint condition, and a low-cost filling cementing material proportion optimization model is established as follows:
optimizing the target:MinC T = Min F 3(X)
constraint conditions are as follows:R 7d=F 1 (X)≥[R 7d]；R 28d=F 2 (X)≥[R 28d]
in the formula (2)R 7d]、[R 28d]Respectively designing strength indexes for the cemented filling bodies 7d and 28d by a filling mining method;
by solving the optimization model, the optimized formula of the composite exciting agent with the lowest filling cementing material cost can be obtained, and therefore the low-cost filling cementing material meeting the filling mining requirements can be prepared.
2. The design method of the low-cost composite excitation filling cementing material according to claim 1, is characterized in that: in the step (1), the formula of the salt-based activator cementing material is as follows: 13-17wt% of sulfate excitant, 2-6wt% of base excitant, 0-1.0 wt% of industrial mirabilite and the balance of slag micro powder.
3. The design method of the low-cost composite excited filling cementing material according to the claim 2, characterized in that, in the step (2), the formulation of the base excitant filling cementing material is as follows: 8-12wt% of basic group excitant, 2-6wt% of sulfate excitant, 0-1.0 wt% of industrial mirabilite and the balance of slag micro powder.
4. The design method of the low-cost composite excited filling cementing material according to the claim 3, characterized in that, in the steps (1) and (2), the sulfate excitant is desulfurized gypsum, and the water content of the powder is<8wt%、SO3Content (wt.)>38wt% and fineness of powder<15%。
5. The design method of the low-cost composite excited filling cementing material according to the claim 4, characterized in that in the steps (1) and (2), the basic group excitant is cement clinker and quicklime, the fineness of the powder is less than 5wt%, and the CaO content is more than 80 wt%.
6. The design method of the low-cost composite excited filling cementing material according to the claim 5, characterized in that in the steps (1) and (2), the high-temperature curing conditions are as follows: the temperature is 38-42 ℃, and the humidity is more than or equal to 95 percent.
7. The method for designing low-cost composite excited filling cementing material according to claim 6, wherein in the step (3), the ratio of the sulfate activator in the formula of the composite activator is preferably determined according to the ratio of the salt activator in the step (1)The ratio of the sulfate excitant in the formula is floated up and down by 1-2% to determine the test range, and the ratio of the base excitant in the optimized formula of the base excitant in the step (2) is floated up and down by 1-2% to determine the test range; i.e. A = A1±（1-2%），B=B2±（1-2%）；
A is the proportion of sulfate excitant in the formula of the composite excitant, A1Optimizing the proportion of the sulfate excitant in the formula for the base excitant in the step (1); b is the base activator proportion in the formula of the compound activator, B2Optimizing the proportion of the base exciting agent in the formula for the base exciting agent in the step (2).
8. The method as claimed in claim 7, wherein in step (3), the strength test method is performed according to GB/T17671-1999 Cement mortar Strength test method (ISO method).
9. The method for designing the low-cost composite activated filling cementing material according to any one of the claims 1 to 8, which is characterized by further comprising the steps of carrying out strength verification and cost analysis on the cemented filling body of the formula of the composite activated filling cementing material obtained in the step (4).
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