CN111205038A - Pumping total iron tailing concrete and preparation method thereof - Google Patents
Pumping total iron tailing concrete and preparation method thereof Download PDFInfo
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- 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
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Abstract
The pumped concrete with the total iron tailings comprises 233.3-318.0 kg of cement, 100.0-136.3 kg of iron tailing powder, 661.8-814.5 kg of iron tailing sand, 1064.8-1247.6 kg of iron tailing stone, 165-175 kg of water and 1.6-2.6 kg of a water reducing agent in terms of per cubic meter of concrete. The preparation method of the pumped full-iron tailing concrete comprises the following steps: mixing iron tailing sand, iron tailing powder and cement to obtain mixed powder; mixing the mixed powder with iron tailing stone to obtain a mixed dry material; and mixing the mixed liquid of the water reducing agent and the water with the mixed dry material obtained in the step to obtain the concrete. The pumped all-iron tailing concrete adopts iron tailing powder to replace 30% of cement by mass in common concrete, the iron tailing powder is used as fine aggregate, iron tailing stone is used as coarse aggregate, and all components are matched with each other, so that a large amount of iron tailings can be utilized, and the cost is low. In the pumped all-iron tailing concrete, the highest consumption of the iron tailings reaches 83.5 percent, and each parameter of the concrete is superior to that of the common concrete, thereby meeting the requirement of daily construction.
Description
Technical Field
The invention relates to the technical field of industrial waste recovery, in particular to pumped all-iron tailing concrete and a preparation method thereof.
Background
With the rapid development of the steel industry in China, the discharge amount of iron tailings is increased day by day, the comprehensive utilization rate is low, and a large amount of tailings are accumulated. Not only is mineral resources wasted greatly, but also a large amount of manpower, material resources and financial resources are consumed for discharging and storing tailings, a large amount of farmlands are occupied, ecological environment pollution is caused, and even dam break of a tailing pond is caused, so that life and property safety of people are seriously threatened. According to statistics, the accumulated stockpiled tailings in China currently have more than 120 hundred million tons, annual discharge amount reaches 16 hundred million tons, the comprehensive utilization rate of the tailings is only 18.9 percent, the comprehensive treatment rate of iron tailing sand is 7 percent, and most of tailings are not comprehensively utilized. The problem of potential harm can be solved by improving the utilization rate of the iron tailings. Hebei province is the province with the largest steel yield in China, and the iron tailings are most accumulated in China. According to statistics, the iron tailings stock in the Tangshan area is about 4.58 hundred million m3The iron tailings in the Qian' an city have the largest stockpiling amount, which accounts for 73% of the total amount of the Tangshan city, the others account for 11% in turn, and the iron tailings in Qianxi and Ying28390, account for 8% of the total amount of the iron tailings in the Xian city, and the improvement of the comprehensive utilization rate of the iron tailings is very important.
Because the traditional utilization mode can not consume a large amount of iron tailings, most of the iron tailings are not comprehensively utilized. The iron tailings can be obtained free of charge, and with the progress of science and technology and the shortage of natural resources, the iron tailings have attracted attention at home and abroad as an important secondary mineral resource. Therefore, in the face of the severe condition of the emission and influence of the iron tailings in China at present, a new technology and a new product with high utilization rate and high added value need to be developed, so as to achieve the purposes of improving the comprehensive utilization rate of the iron tailings and reducing the environmental influence.
Concrete is the most widely used civil engineering material at present, the broken stone as concrete coarse aggregate is mainly prepared by mechanically crushing and screening mined stone, and the sand as concrete fine aggregate is mainly river sand which is generally mined from river channels. The mining of rocks and sands in the river can not only destroy the ecological environment of the mountain and the river, but also cause a great deal of environmental pollution. In addition, in order to improve the workability, durability and other properties of concrete, admixtures are generally added into the concrete, and the most widely used admixture at present is fly ash. The fly ash is reused as the production emission of a coal-fired power plant, along with the stricter and stricter restriction on the coal-fired power plant in recent years, the emission amount of the fly ash is reduced year by year, the price is continuously improved, so that the fly ash serving as a main admixture of concrete is in an unsustainable state, and the condition that part of concrete production enterprises meet the intermittent supply of the fly ash at present is investigated. Effectively utilizes industrial wastes such as iron tailings and the like, and realizes a green novel concrete material capable of sustainable development, which is a necessary choice.
However, the iron tailings are difficult to utilize due to large iron tailing stacking amount, different types of iron tailings in different producing areas and large component difference. In addition, in the existing iron tailing concrete technology, the iron tailings are mostly tailings sand with the particle size of 0.075-4.75 mm to replace fine aggregate, tailings with the particle size of more than 4.75mm to replace coarse aggregate, and a small part of technology adopts tailings powder with the particle size of less than 0.075 to replace fine aggregate, so that the iron tailings used in the technology are small in amount, and the utilization rate of the iron tailings is low. Therefore, at present, there is no comprehensive utilization technology of iron tailings with high environmental protection efficiency, large consumption of iron tailings and high economic value, and the comprehensive utilization of iron tailings is difficult and high in cost, so that a solution is urgently needed.
Disclosure of Invention
The invention aims to provide pumped all-iron tailing concrete and a preparation method thereof. The pumped all-iron tailing concrete provided by the invention takes a large amount of iron tailings as a concrete raw material, can utilize a large amount of iron tailings, is low in cost, and can play a role in saving cement in the concrete industry.
The invention provides pumped all-iron tailing concrete, which comprises the following components in per cubic meter of concrete:
233.3-318.0 kg of cement
100.0-136.3 kg of iron tailing powder
661.8-814.5 kg of iron tailing sand
1064.8-1247.6 kg of iron tailings
165-175 kg of water
1.6-2.6 kg of water reducing agent.
Preferably, the specific surface area of the iron tailing powder is 480-560 m2/kg, particle size less than 0.3 mm.
Preferably, the iron tailing sand is medium sand in a zone II, the particle size of the iron tailing sand is 0.075-4.75 mm, and the fineness modulus of the iron tailing sand is 2.9.
Preferably, the particle size of the iron tailing ore is 2.36-19 mm, and 5-20 continuous grading is performed.
Preferably, the mass of the iron tailing powder, the iron tailing sand and the iron tailing ore is 80.0-83.5% of the total mass of the total iron tailing concrete.
Preferably, the water-to-gel ratio of the all-iron tailing concrete is 0.39-0.51.
Preferably, the mixing amount of the water reducing agent is 0.47-0.60% of the mass of the cementing material.
Preferably, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent with the solid content of 40%.
Preferably, the cement is Portland cement with 42.5 grades of ordinary Portland or 42.5 or more strength grades.
The invention also provides a preparation method of the pumped all-iron tailing concrete, which comprises the following steps:
(1) mixing iron tailing sand, iron tailing powder and cement to obtain mixed powder;
(2) mixing the mixed powder obtained in the step (1) with iron tailing stone to obtain a mixed dry material;
(3) and (3) mixing the mixed liquid of the water reducing agent and the water with the mixed dry material obtained in the step (2) to obtain the concrete.
The invention provides pumped all-iron tailing concrete which comprises 233.3-318.0 kg of cement, 100.0-136.3 kg of iron tailing powder, 661.8-814.5 kg of iron tailing sand, 1064.8-1247.6 kg of iron tailing stone, 165-175 kg of water and 1.6-2.6 kg of water reducing agent in terms of per cubic meter of concrete. According to the pumped all-iron tailing concrete provided by the invention, 30% of cement in the traditional concrete is replaced by iron tailing powder, the fine particle size can fill the pores during cement cementation, the pore size can be cemented with gel generated by cement hydration reaction, and the pores of coarse and fine aggregates are filled, and the workability of a concrete mixture can be improved due to the water requirement of the pore size; a certain amount of iron tailing sand is used as fine aggregate to form mortar with cement, iron tailing powder and water, the coarse aggregate is wrapped to have certain fluidity, and pores generated when the coarse aggregate is stacked are filled, so that the filling is dense and the strength is increased; a certain amount of iron tailing stones are used as coarse aggregates, and the main framework supporting function of strength is achieved in concrete; the components are matched with each other, so that a large amount of iron tailings can be utilized, the cost is low, the problems of land occupation, environmental pollution, potential disasters of tailing dams and the like caused by the iron tailings generated in the steel industry are solved, and the effect of saving cement is also achieved. Experimental results show that the highest usage amount of the iron tailings in the pumped total iron tailing concrete reaches 83.5%, and each parameter of the concrete is superior to that of the original concrete, so that the requirement of daily construction is met.
Drawings
Fig. 1 is a flow chart of a preparation method of the pumped full iron tailing concrete in the embodiment 1 of the invention.
Detailed Description
The invention provides pumped all-iron tailing concrete which comprises 233.3-318.0 kg of cement, 100.0-136.3 kg of iron tailing powder, 661.8-814.5 kg of iron tailing sand, 1064.8-1247.6 kg of iron tailing stone, 165-175 kg of water and 1.6-2.6 kg of water reducing agent in terms of per cubic meter of concrete.
The pumped all-iron tailing concrete comprises 233.3-318.0 kg of cement, preferably 278.7-308.9 kg of cement per cubic meter of concrete. In the present invention, the cement is preferably Portland cement of Portland 42.5 grade or strength grade of 42.5 or more. In the invention, the cement and water have hydration reaction to generate gel which plays a role in cementation, fills pores formed by stacking coarse and fine aggregates and has strength after hardening; the low cement consumption can reduce the strength and the cohesive force of the concrete and is not beneficial to the strength of the concrete; too high cement quantity will make the cost increase, and too sticky mixture is unfavorable for the construction, and too high concrete strength causes the waste.
The pumped total iron tailing concrete comprises 100.0-136.3 kg of iron tailing powder, preferably 119.5-132.4 kg of iron tailing powder, calculated by each cubic meter of concrete. In the invention, the iron tailing powder replaces cement according to the proportion of 30%, the fine particle size can fill the pores during cement cementation, and the iron tailing powder and gel generated by cement hydration reaction are cemented together and fill the pores of coarse and fine aggregates, and the material has the water requirement so that the workability of a concrete mixture can be improved. In the present invention, the iron ore tailings powder used in an excessively low amount increases the strength of the concrete but decreases the workability.
In the invention, the specific surface area of the iron tailing powder is preferably 480-560 m2Per kg, more preferably 500 to 520m2Per kg; the particle size of the iron tailings powder is preferably less than 0.3mm, more preferably less than 0.2 mm. In the present invention, the iron ore tailings powder is preferably ground by a machine to the above-mentioned particle size. In the invention, the finely ground iron tailing powder has water-based property, and when the iron tailing powder is added into concrete, the coarse aggregate is uniformly wrapped by the mortar in the mixture which is originally in a segregation state.
The pumped total iron tailing concrete comprises 661.8-814.5 kg of iron tailing sand, preferably 787.0-804.0 kg of iron tailing sand per cubic meter of concrete. In the invention, the particle size of the iron tailing sand is preferably 0.075-4.75 mm, and more preferably 0.1-4.2 mm; the iron tailing sand is preferably medium sand in a II area with fineness modulus of 2.9. In the invention, the iron tailing sand is used as fine aggregate to form mortar with cement, iron tailing powder and water, the mortar wraps the coarse aggregate to enable the coarse aggregate to have certain fluidity, and fills pores generated when the coarse aggregate is stacked, so that the filling is dense and the strength is increased.
The pumped total iron tailing concrete comprises 1064.8-1247.6 kg of iron tailing stones, preferably 1080.0-1130.0 kg of iron tailing stones, calculated by each cubic meter of concrete. In the invention, the particle size of the iron tailing ore is preferably 2.36-19 mm, and 5-20 continuous grading is adopted. In the invention, the iron tailing stones are used as coarse aggregates and play a main skeleton supporting role in strength in concrete.
In the invention, the mass of the iron tailing powder, the iron tailing sand and the iron tailing ore is preferably 80.0-83.5% of the total mass of the total iron tailing concrete, and more preferably 81.0-83.4%. In the invention, the iron tailings are preferably industrial waste residues discharged from a certain mine field in Chua gardens of Qian' an city, Hebei province, and are obtained after screening.
In the invention, the water-to-gel ratio of the total iron tailing concrete is preferably 0.39-0.51, and more preferably 0.42-0.48. In the invention, the mixing amount of the water reducing agent is preferably 0.47-0.60% of the mass of the cementing material, and more preferably 0.47-0.49%. In the invention, the cementing material is a mixture of cement and iron tailing powder, and the proportion of the components is preferably 1: 0.43.
The pumped all-iron tailing concrete comprises 165-175 kg of water, preferably 170kg of water, calculated by each cubic meter of concrete.
The pumped all-iron tailing concrete comprises 1.6-2.6 kg of water reducing agent, preferably 2.0-2.4 kg of water reducing agent per cubic meter of concrete. In the invention, the water reducing agent is preferably a polycarboxylic acid type high-efficiency water reducing agent with the solid content of 40%. The source of the water reducing agent is not particularly limited in the present invention, and a commercially available water reducing agent known to those skilled in the art may be used.
According to the pumped all-iron tailing concrete provided by the invention, 30% of cement in the traditional concrete is replaced by iron tailing powder, the fine particle size can fill the pores during cement cementation, the pore size can be cemented with gel generated by cement hydration reaction, and the pores of coarse and fine aggregates are filled, and the workability of a concrete mixture can be improved due to the water requirement of the pore size; a certain amount of iron tailing sand is used as fine aggregate to form mortar with cement, iron tailing powder and water, the coarse aggregate is wrapped to have certain fluidity, and pores generated when the coarse aggregate is stacked are filled, so that the filling is dense and the strength is increased; a certain amount of iron tailing stones are used as coarse aggregates, and the main framework supporting function of strength is achieved in concrete; the components are matched with each other, so that a large amount of iron tailings can be utilized, the cost is low, the problems of land occupation, environmental pollution, potential disasters of tailing dams and the like caused by the iron tailings generated in the steel industry are solved, and the effect of saving cement is also achieved.
The invention also provides a preparation method of the pumped all-iron tailing concrete, which comprises the following steps:
(1) mixing iron tailing sand, iron tailing powder and cement to obtain mixed powder;
(2) mixing the mixed powder obtained in the step (1) with iron tailing stone to obtain a mixed dry material;
(3) and (3) mixing the mixed liquid of the water reducing agent and the water with the mixed dry material obtained in the step (2) to obtain the concrete.
The invention mixes iron tailing sand, iron tailing powder and cement to obtain mixed powder. The operation of mixing the iron tailing sand, the iron tailing powder and the cement is not particularly limited, and the technical scheme for preparing the mixed powder, which is well known by the technical personnel in the field, is adopted. In the present invention, the mixing of the iron tailing sand, the iron tailing powder and the cement is preferably performed in a mixer; the stirring speed is preferably 40-50 r/min, more preferably 45r/min, and the stirring time is preferably 10-30 s, more preferably 15-25 s.
After the mixed powder is obtained, the mixed powder is mixed with the iron tailing stone to obtain a mixed dry material. The operation of mixing the mixed powder and the iron tailing stone is not particularly limited, and the technical scheme for preparing the mixed powder, which is well known to the technical personnel in the field, can be adopted. In the invention, the mixing of the mixed powder and the iron tailing ore is preferably carried out in a stirrer; the stirring speed is preferably 40-50 r/min, more preferably 45r/min, and the stirring time is preferably 10-30 s, more preferably 15-25 s.
After the mixed dry material is obtained, the mixed liquid of the water reducing agent and the water is mixed with the mixed dry material to obtain the concrete. According to the invention, the water reducing agent and water are preferably mixed to obtain a mixed solution, and then the mixed solution is mixed with the mixed dry material. The operation of mixing the mixed liquid and the dry mixed material is not particularly limited, and the technical scheme for preparing the mixed powder material, which is well known by the technical personnel in the field, can be adopted. In the present invention, the mixing of the mixed liquid and the dry mixed material is preferably performed in a mixer; the stirring speed is preferably 40-50 r/min, more preferably 45r/min, and the stirring time is preferably 180-200 s, more preferably 190 s.
Compared with the prior art, the invention has the following beneficial effects:
(1) the iron tailing powder used in the invention replaces the traditional concrete admixture fly ash, the iron tailing sand stone completely replaces natural river sand and broken stone, the utilization rate of the iron tailing is high, the use amount is large, natural ore resources can be saved, the problems that the stacking of the tailings occupies the land and pollutes the environment are solved, the industrial waste residue of the iron tailing is changed into valuable, the product added value is increased, and the novel green and environment-friendly iron tailing concrete is provided;
(2) the mass ratio of the raw materials of iron tailing powder, iron tailing sand and iron tailing ore reaches up to 83.5%, and the pumped all-iron tailing concrete improves the utilization rate of iron tailings compared with the traditional concrete and reduces the cost of the raw materials of the concrete on the premise of meeting the strength grade of the concrete, so that the iron tailing concrete not only reduces the single-component cost of the concrete, but also utilizes the iron tailings to a greater extent, and solves various environmental problems caused by stacking of the tailings;
(3) the iron tailing powder used in the invention can well exert the activity within the range of the specific surface area, has lower grinding cost, has thinner grain diameter compared with cement, can play a good filling role, improves the compactness of concrete, and is beneficial to improving the strength, impermeability and the like of the concrete;
(4) the pumped all-iron tailing concrete provided by the invention enables the iron tailings to be consumed in a large amount, provides novel energy-saving and environment-friendly green concrete for development and construction, old urban area transformation and the like at present, meets the requirement of daily construction, and has remarkable social and economic benefits.
In order to further illustrate the present invention, the pumped all-iron tailing concrete and the preparation method thereof provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
The following examples and comparative examples relate to the starting materials: ordinary Portland P.O 42.5 cement, polycarboxylic acid high-efficiency water reducing agent with 40% of solid content, iron tailing powder, iron tailing sand and iron tailing ore all come from industrial waste residues discharged from a certain mine field in the Chua garden of the Changan city of Hebei province, the iron tailing sand and the iron tailing ore are used after being simply screened, the iron tailing powder with the particle size of less than 2.36mm is ground by a machine, and the specific surface area of the iron tailing powder reaches 480-560 m2The grain diameter is less than 0.3mm and is used between/kg; the particle size of the iron tailing sand is 0.075-4.75 mm, the fineness modulus is 2.9, and the sand in the area II; the particle size of the iron tailing ore is 2.36-19 mm, and 5-20 continuous grades of the iron tailing ore are graded.
Example 1
The proportion of the pumped all-iron tailing concrete in the embodiment is as follows: cement, iron tailing powder, water, iron tailing sand and iron tailing ore, wherein the ratio of water to cement to iron tailing powder to iron tailing sand is 1:0.43:0.61:2.88:3.96, and the water-cement ratio is 0.43.
The total iron tailing concrete comprises the following raw materials in per cubic meter of concrete:
cement: 278.7kg
Iron tailing powder: 119.5kg
Water: 170kg of
Iron tailing sand: 804.0kg
Iron tailings: 1103.0kg
Water reducing agent: 2.0kg
The mass of the iron tailing powder, the iron tailing sand and the iron tailing accounts for 81.9 percent of the total mass of the concrete.
In the embodiment, the mixing amount of the water reducing agent is 0.49% of the mass of the cementing material, the water-to-gel ratio is 0.43, the cementing material is a mixture of cement and iron tailing powder, and the proportion of the components is 1: 0.43.
In this example, the water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent with a solid content of 40%.
In this example, the cement is a Portland 42.5 grade.
The chemical composition of the iron tailings is shown in table 1.
Table 1 example 1 iron tailings chemical composition
The content of silicon dioxide in the iron tailings exceeds 60 percent, belongs to high-silicon type iron tailings, and is beneficial to improving the hardness of the iron tailings.
The process flow of the preparation method of the pumped all-iron tailing concrete in the embodiment is shown in fig. 1, and the steps are as follows:
weighing raw materials of 278.7kg of cement, 119.5kg of iron tailing powder and 804.0kg of iron tailing sand per cubic meter according to the mixing ratio, pouring the weighed raw materials into a stirrer, and stirring for 30 seconds to uniformly stir the materials.
And step two, weighing raw materials according to the mixing proportion, wherein the dosage of the iron tailing per cubic meter is 1103.0kg, and stirring the raw materials and the raw materials in the step one for 30s to uniformly mix the raw materials and the iron tailing.
And step three, mixing the weighed water and the water reducing agent, and uniformly stirring, wherein the using amount of water per cubic meter is 170kg, and the using amount of the high-efficiency water reducing agent is 2.0 kg.
And step four, directly pouring the mixed liquid of the water and the water reducing agent in the step three into a stirrer, and stirring for 180s until the concrete mixture is uniformly stirred, so that the pumped all-iron tailing concrete is prepared.
The prepared all-iron tailing concrete is manufactured into a plurality of cube test blocks of 100mm multiplied by 100mm, after being cured for 28 days under the standard that the relative temperature is 20 +/-1 ℃ and the relative humidity is not less than 95%, the all-iron tailing concrete is subjected to concrete cube compression strength and splitting tensile strength tests according to the corresponding test regulations in GB/T50081-2002 Standard of testing methods for mechanical properties of ordinary concrete, and the test results are shown in Table 2.
Table 2 example 1 all iron tailings concrete test results
Comparative example 1
The concrete is prepared from cement, fly ash, water, river sand and broken stone in a mixing ratio of 1:0.43:0.61:2.72: 3.76.
The water-to-glue ratio was 0.43.
The raw material concrete is commonly used, and the composition raw materials per cubic meter of concrete are as follows:
cement: 278.7kg
Fly ash: 119.5kg
Water: 170kg of
River sand: 759.4kg
Crushing stone: 1048.8kg
Water reducing agent: 2.4kg
The mixing amount of the water reducing agent is 0.60 percent of the mass of the cementing material, the water-cement ratio is 0.43, wherein the cementing material is a mixture of cement and fly ash, and the proportion of the components is 1: 0.43.
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent with the solid content of 40 percent.
The cement is ordinary silicate 42.5 grade, and the fly ash is II grade fly ash.
The river sand has the grain diameter of 0.075-4.75 mm and the fineness modulus of 2.8, and is medium sand in the area II.
The particle size of the crushed stone is 2.36-19 mm, and 5-20 continuous graded crushed stones are obtained.
The preparation of the common raw material concrete is carried out according to the preparation method of the pumped all-iron tailing concrete described in the embodiment 1, a plurality of cube test blocks of 100mm × 100mm × 100mm are prepared, after standard curing at a relative temperature of 20 ± 1 ℃ and a relative humidity of not less than 95% for 28d, the concrete cube compression strength and splitting tensile strength tests are carried out on the common raw material concrete according to the corresponding test regulations in GB/T50081-2002 standard of the test methods for mechanical properties of common concrete, and the test results are shown in table 3.
Table 3 comparative example 1 concrete test results
Example 2
The mix proportion of the pumped all-iron tailing concrete in the embodiment is as follows: cement, iron tailing powder, water, iron tailing sand and iron tailing ore, wherein the ratio of the iron tailing powder to the iron tailing sand is 1:0.43:0.55:2.55: 3.50. The water-to-glue ratio was 0.39.
The total iron tailing concrete of the embodiment comprises the following raw materials per cubic meter of concrete:
cement: 308.9kg
Iron tailing powder: 132.4kg
Water: 170kg of
Iron tailing sand: 787.0kg
Iron tailings: 1080.0kg
Water reducing agent: 2.1kg
The mass of the iron tailing powder, the iron tailing sand and the iron tailing accounts for 80.7 percent of the total mass of the concrete.
In the embodiment, the mixing amount of the water reducing agent is 0.47% of the mass of the cementing material, the water-to-gel ratio is 0.39, the cementing material is a mixture of cement and iron tailing powder, and the proportion of the components is 1: 0.43.
In this example, the water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent with a solid content of 40%.
In this example, the cement is a Portland 42.5 grade.
The composition of the iron tailings is shown in table 4.
Table 4 example 2 chemical composition of iron tailings
The content of silicon dioxide in the iron tailings exceeds 60 percent, belongs to high-silicon type iron tailings, and is beneficial to improving the hardness of the iron tailings.
The preparation method and the steps of the pumped all-iron tailing concrete are as follows:
step one, weighing raw materials including 308.9kg of cement, 132.4kg of iron tailing powder and 787.0kg of iron tailing powder according to the mixing ratio, wherein the raw materials are used per cubic meter, and pouring the weighed raw materials into a stirrer to stir for 30s so as to uniformly stir the materials.
And step two, weighing raw materials according to the mixing proportion, wherein the dosage of the iron tailing per cubic meter is 1080.0kg, and stirring the raw materials and the raw materials in the step one for 30s to uniformly mix the raw materials and the iron tailing.
And step three, mixing the weighed water and the water reducing agent, and uniformly stirring, wherein the using amount of water per cubic meter is 170kg, and the using amount of the high-efficiency water reducing agent is 2.1 kg.
And step four, directly pouring the mixed liquid of the water and the water reducing agent in the step three into a stirrer, and stirring for 180s until the concrete mixture is uniformly stirred, so that the pumped all-iron tailing concrete is prepared.
The prepared all-iron tailing concrete is manufactured into a plurality of cube test blocks of 100mm multiplied by 100mm, after being cured for 28 days under the standard that the relative temperature is 20 +/-1 ℃ and the relative humidity is not less than 95%, the all-iron tailing concrete is subjected to concrete cube compression strength and splitting tensile strength tests according to the corresponding test regulations in GB/T50081-2002 Standard of testing methods for mechanical properties of ordinary concrete, and the test results are shown in Table 5.
Table 5 example 2 all iron tailings concrete test results
Comparative example 2
The concrete is prepared from cement, fly ash, water, river sand and broken stone in a mixing ratio of 1:0.43:0.55:2.40: 3.32.
The water-to-glue ratio was 0.43.
The raw material concrete is commonly used, and the composition raw materials per cubic meter of concrete are as follows:
cement: 308.9kg
Fly ash: 132.4kg
Water: 170kg of
River sand: 741.8kg
Crushing stone: 1024.3kg
Water reducing agent: 2.6kg
The mixing amount of the water reducing agent is 0.59 percent of the mass of the cementing material, the water-cement ratio is 0.39, wherein the cementing material is a mixture of cement and fly ash, and the proportion of the components is 1: 0.43.
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent with the solid content of 40 percent.
The cement is ordinary silicate 42.5 grade, and the fly ash is II grade fly ash.
River sand with particle size of 0.075-4.75 mm and fineness modulus of 2.8, and sand in zone II.
The particle size of the crushed stone is between 2.36mm and 19mm, and 5 to 20 continuous graded crushed stones are obtained.
The preparation of the common raw material concrete is carried out according to the preparation method of the pumped all-iron tailing concrete described in the embodiment 2, a plurality of cube test blocks of 100mm × 100mm × 100mm are prepared, after standard curing at a relative temperature of 20 ± 1 ℃ and a relative humidity of not less than 95% for 28d, the concrete cube compressive strength and the splitting tensile strength of the common raw material concrete are tested according to the corresponding test regulations in GB/T50081-2002 standard of the test methods of mechanical properties of common concrete, and the test results are shown in table 6.
Table 6 comparative example 2 concrete test results
As can be seen from the above examples and comparative examples, the parameters of the all-iron tailing concrete provided by the invention are not very different from those of the common raw material concrete, and the all-iron tailing concrete meets various requirements.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. The pumped all-iron tailing concrete comprises the following components in per cubic meter of concrete:
233.3-318.0 kg of cement;
100.0-136.3 kg of iron tailing powder;
661.8-814.5 kg of iron tailing sand;
1064.8-1247.6 kg of iron tailings;
165-175 kg of water;
1.6-2.6 kg of water reducing agent.
2. The pumped all-iron tailing concrete according to claim 1, wherein the specific surface area of the iron tailing powder is 480-560 m2/kg, particle size less than 0.3 mm.
3. The pumped all-iron tailing concrete according to claim 1, wherein the iron tailing sand is medium sand in zone II with the particle size of 0.075-4.75 mm and the fineness modulus of 2.9.
4. The pumped all-iron tailing concrete according to claim 1, wherein the particle size of the iron tailing ore is 2.36-19 mm, and 5-20 continuous grading is adopted.
5. The pumped all-iron tailing concrete according to any one of claims 1 to 4, wherein the mass of the iron tailing powder, the iron tailing sand and the iron tailing ore is 80.0 to 83.5 percent of the total mass of the all-iron tailing concrete.
6. The pumped all-iron tailing concrete according to claim 5, wherein the water-to-gel ratio of the all-iron tailing concrete is 0.39-0.51.
7. The pumped all-iron tailing concrete according to claim 5, wherein the mixing amount of the water reducing agent is 0.47-0.60% of the mass of the cementing material.
8. The pumped all-iron tailing concrete according to claim 1 or 7, characterized in that the water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent with 40% of solid content.
9. The pumped all iron tailings concrete of claim 1 wherein the cement is portland cement grade 42.5 or a strength grade of 42.5 or greater.
10. The method for preparing the pumped all-iron tailing concrete as claimed in any one of claims 1 to 9, which comprises the following steps:
(1) mixing iron tailing sand, iron tailing powder and cement to obtain mixed powder;
(2) mixing the mixed powder obtained in the step (1) with iron tailing stone to obtain a mixed dry material;
(3) and (3) mixing the mixed liquid of the water reducing agent and the water with the mixed dry material obtained in the step (2) to obtain the concrete.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456923A (en) * | 2021-01-07 | 2021-03-09 | 东北大学 | High-silicon type iron tailing multielement solid waste activated concrete and preparation method thereof |
| CN112521076A (en) * | 2020-12-15 | 2021-03-19 | 中国十七冶集团有限公司 | Iron tailing high-slump high-strength conductive concrete and preparation method thereof |
| CN113683363A (en) * | 2021-09-02 | 2021-11-23 | 泉州三方建材有限公司 | Concrete |
| US11325861B1 (en) | 2021-01-07 | 2022-05-10 | Northeastern University | Multi-solid waste activated concrete with high-silicon iron ore tailings and preparation method thereof |
| CN114573295A (en) * | 2022-03-08 | 2022-06-03 | 河北农业大学 | Green iron tailing concrete with high carbonization resistance and preparation method thereof |
| CN114671646A (en) * | 2022-04-19 | 2022-06-28 | 东南大学 | Controllable low-strength material prepared from iron ore tailings and preparation method |
| CN115010433A (en) * | 2022-06-13 | 2022-09-06 | 南京工程学院 | High-silicon-content iron tailing concrete and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106892622A (en) * | 2017-03-29 | 2017-06-27 | 河北建筑工程学院 | A kind of large dosage iron tailing concrete and preparation method thereof |
| CN107540309A (en) * | 2017-09-15 | 2018-01-05 | 中交武汉港湾工程设计研究院有限公司 | A kind of slope-protecting prefabricated concrete concrete of iron-containing tailing and preparation method thereof |
| CN109879650A (en) * | 2019-04-10 | 2019-06-14 | 东北大学 | It is a kind of to substitute iron tailing concrete and preparation method thereof entirely |
| CN110698098A (en) * | 2019-09-25 | 2020-01-17 | 中建西部建设北方有限公司 | Corrosion-resistant iron tailing aggregate, corrosion-resistant concrete and preparation method thereof |
-
2020
- 2020-01-19 CN CN202010058879.0A patent/CN111205038A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106892622A (en) * | 2017-03-29 | 2017-06-27 | 河北建筑工程学院 | A kind of large dosage iron tailing concrete and preparation method thereof |
| CN107540309A (en) * | 2017-09-15 | 2018-01-05 | 中交武汉港湾工程设计研究院有限公司 | A kind of slope-protecting prefabricated concrete concrete of iron-containing tailing and preparation method thereof |
| CN109879650A (en) * | 2019-04-10 | 2019-06-14 | 东北大学 | It is a kind of to substitute iron tailing concrete and preparation method thereof entirely |
| CN110698098A (en) * | 2019-09-25 | 2020-01-17 | 中建西部建设北方有限公司 | Corrosion-resistant iron tailing aggregate, corrosion-resistant concrete and preparation method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112521076A (en) * | 2020-12-15 | 2021-03-19 | 中国十七冶集团有限公司 | Iron tailing high-slump high-strength conductive concrete and preparation method thereof |
| CN112456923A (en) * | 2021-01-07 | 2021-03-09 | 东北大学 | High-silicon type iron tailing multielement solid waste activated concrete and preparation method thereof |
| US11325861B1 (en) | 2021-01-07 | 2022-05-10 | Northeastern University | Multi-solid waste activated concrete with high-silicon iron ore tailings and preparation method thereof |
| CN113683363A (en) * | 2021-09-02 | 2021-11-23 | 泉州三方建材有限公司 | Concrete |
| CN114573295A (en) * | 2022-03-08 | 2022-06-03 | 河北农业大学 | Green iron tailing concrete with high carbonization resistance and preparation method thereof |
| CN114671646A (en) * | 2022-04-19 | 2022-06-28 | 东南大学 | Controllable low-strength material prepared from iron ore tailings and preparation method |
| CN115010433A (en) * | 2022-06-13 | 2022-09-06 | 南京工程学院 | High-silicon-content iron tailing concrete and preparation method thereof |
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