CN108529945B - Resource utilization method of iron ore waste stone - Google Patents
Resource utilization method of iron ore waste stone Download PDFInfo
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- CN108529945B CN108529945B CN201810664913.1A CN201810664913A CN108529945B CN 108529945 B CN108529945 B CN 108529945B CN 201810664913 A CN201810664913 A CN 201810664913A CN 108529945 B CN108529945 B CN 108529945B
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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
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Mining & Mineral Resources (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a resource utilization method of iron ore waste rock, which comprises the steps of crushing and screening the iron ore waste rock to respectively obtain coarse aggregate with the size fraction of 10-30mm, medium aggregate with the size fraction of 5-10mm, fine aggregate with the size fraction of 1-5mm, superfine aggregate with the size smaller than 1mm and iron ore waste rock powder with the size not larger than 0.15 mm; mixing 5-40 parts of coarse aggregate, 10-30 parts of medium aggregate and 30-80 parts of fine aggregate according to parts by weight to obtain mixed aggregate; according to the mass parts, uniformly stirring and mixing materials comprising 50-60 parts of mixed aggregate, 30-35 parts of water, 10-20 parts of cement, 1-2 parts of water reducing agent and 1-3 parts of retarder to obtain a mixed material; and forming and maintaining the mixed material to obtain a resource utilization product of the iron ore waste stone. The method can prepare various resource utilization products by utilizing the iron ore waste rocks, and the prepared products have high strength, excellent water permeability and wide application range.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a resource utilization method of iron ore waste rocks.
Background
The iron ore waste rock is waste slag generated in the process of iron ore mining and mineral dressing, and is a main component of industrial solid waste. Chinese iron ore resources have the characteristics of low grade, more symbiotic associated ores and the like, so that a large amount of iron ore waste rocks are generated in the ore dressing process. Associated waste rocks are usually hard and fragile, a large amount of fragments are inevitably generated in the mining process, and a large amount of small crushed rocks with excellent quality are reset into the waste rocks and stacked in a waste rock warehouse due to the cost limitation of manual selection, so that the waste rocks cannot be utilized, and a large amount of resources are wasted; and the iron ore waste rocks occupy a large amount of land and are easy to damage the surrounding ecological environment.
At present, the related research on the utilization of iron ore waste stones mainly comprises the directions of recovery of valuable elements, building materials, ceramic materials, soil improvement agents, trace element fertilizers and the like. In building materials, iron ore waste rocks are mainly used for preparing products such as concrete, water permeable bricks and the like, however, concrete materials prepared in the prior art have low mechanical properties and narrow application range.
For example, Chinese patent application No. 201710628006.7 discloses a resource utilization method of iron tailing waste stone, which is to mix and mix 60-80kg of admixture with 1500kg of coarse aggregate 1200-1500 mm, 800kg of fine aggregate 700-80.75 mm and 60-80kg of admixture with 320kg of cement 280-100 kg, water 100-160kg and water reducer 4-6kg to obtain concrete. The strength of the prepared concrete meets the requirement of C40 concrete.
For another example, the chinese patent application No. 201710930190.0 discloses an iron tailing granulation water permeable brick and a preparation method thereof, the method comprises the steps of preparing iron tailing powder balls by using iron tailing with fineness of-200 meshes (-0.075mm), cement and lime, and preparing the water permeable brick by using the iron tailing powder balls, crushed stone and cement. The water permeable brick prepared by the method has the water permeability coefficient of 0.035cm/s, the porosity of 28.88%, the compressive strength of 37.61Mpa, and the strength and the water permeability are still to be further improved.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a resource utilization method of iron ore waste rocks, which can be used for preparing various resource utilization products from the iron ore waste rocks, and the resource utilization products have excellent performances such as compressive strength, water permeability and the like, low manufacturing cost and wide application range.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a resource utilization method of iron ore waste rocks comprises the following steps:
crushing and screening iron ore waste stones to respectively obtain coarse aggregate with the size fraction of 10-30mm, medium aggregate with the size fraction of 5-10mm, fine aggregate with the size fraction of 1-5mm and superfine aggregate smaller than 1 mm;
step two, mixing 5-40 parts of coarse aggregate, 10-30 parts of medium aggregate and 30-80 parts of fine aggregate according to parts by weight to obtain mixed aggregate;
step three, stirring and uniformly mixing materials comprising 50-60 parts of mixed aggregate, 30-35 parts of water, 10-20 parts of cement, 1-2 parts of water reducing agent and 1-3 parts of retarder according to parts by weight to obtain a mixed material;
and step four, forming and maintaining the mixed material to obtain a resource utilization product of the iron ore waste rock.
According to the preparation method, the iron ore waste rock is crushed and screened to obtain the aggregates with different particle sizes, and various iron ore waste rock resource utilization products can be prepared by using the aggregates with different particle sizes, wherein the iron ore waste rock resource utilization products include but are not limited to high-strength electric power towers, high-strength precast tubular piles, concrete precast products such as urban underground pipe galleries and the like, water permeable bricks, 3D printing building materials, building components and the like.
In the invention, the coarse aggregate with the grain size of 10-30mm refers to the aggregate with the grain size of less than or equal to 10mm and less than 30 mm; the medium aggregate with the size fraction of 5-10mm refers to aggregate with the particle size of less than 10mm and less than or equal to 5 mm; the fine aggregate with the grain size of 1-5mm refers to the aggregate with the grain size of less than 5mm and less than or equal to 1 mm.
In the invention, the iron ore waste rock is the waste after mining and mineral dressing; specifically, the iron ore waste rocks comprise low-grade iron ores in the mining process, associated ores and waste residues generated in the iron ore dressing process, and the main component of the iron ore waste rocks is SiO2 35％-50％，CaO 10％-25％，MgO 10％-15％，Fe2O3 10％-15％，Al2O36 to 15 percent; particularly, the iron ore waste rock is crushed and shaped to obtain iron ore waste rock aggregates with various particle sizes, the aggregates are in a multi-edge particle shape and have high hardness, and the aggregates with various particle sizes can be mixed and used in grades and can be prepared into products with various purposes and good performance;
preferably, the water reducing agent is any one of lignosulfonate, naphthalenesulfonate and amino acid sulfonate; the retarder is any one of citrate, tartrate, phosphate and lignosulfonate.
In the invention, the mixed aggregate is obtained by mixing iron ore waste rock aggregates with different particle sizes according to a specific proportion; and the proportion of aggregates of different size fractions can be controlled according to different requirements of resource utilization products.
In one embodiment, the iron ore waste rock resource utilization product is specifically a concrete prefabricated product; in this case, the mixed aggregate is obtained by mixing 30-40 parts of coarse aggregate, 20-30 parts of medium aggregate and 30-40 parts of fine aggregate.
The mixed aggregate is mixed according to a specific proportion by iron ore waste stone aggregates with different particle sizes to achieve proper gradation, and the performances such as the compressive strength and the like of a concrete prefabricated product can be enhanced; in addition, the iron ore waste rock is selected as the manufacturing raw material, so that the manufacturing cost is reduced, and the problems that the iron ore waste rock is piled up to occupy the land area and pollute the ecological environment are solved.
The type of cement is not strictly limited in the present invention, and the cement may be selected from any one of portland cement and aluminate cement; in particular, the cement may be selected from any one of the Portland cements with strength grades 42.5, 52.5 and 62.5, or from any one of the CA-50, CA-60, CA-70 and CA-80 types of aluminate cement.
Further, the stirring speed can be controlled to be 50-60rpm, and the stirring time is 1-3 min; the molding can be compression molding; the curing temperature can be normal temperature, and the curing time is 25-30 days, preferably 28 days.
The process parameters improve the uniform mixing degree of the mixed aggregate and the cement, further increase the bonding strength of the mixed aggregate and the cement, and improve the comprehensive performance of the prepared concrete precast product. In the invention, the strength of the precast concrete product meets the requirement of C60 concrete, and the compressive strength is more than 65 Mpa.
In another embodiment, the iron ore waste rock resource utilization product is specifically a water permeable brick; in this case, the mixed aggregate is obtained by mixing 5-10 parts of coarse aggregate, 10-30 parts of medium aggregate and 50-80 parts of fine aggregate.
The mixed aggregate is mixed with iron ore waste rock aggregates with different particle sizes according to the specific proportion to achieve proper gradation, and the water permeability of the water permeable brick is improved under the condition of ensuring the strength of the water permeable brick.
Further, the material also comprises 5-10 parts of lime and 0.2-2 parts of foaming agent; according to the invention, by adding lime, the hardening speed of cement can be controlled, the adhesive force of the mixed aggregate and the cement can be improved, and the comprehensive performance of the permeable brick can be improved; the foaming agent can be any one of CON-A type foaming agent, CCW-95 type solid foaming agent, u type foaming agent, HJ-3 type sulfonate series micro-foaming agent, CLY-99 type hydrophobic foaming agent series and CPV foaming agent; through the addition of the foaming agent, in the preparation process of the permeable brick, the foaming effect can be realized in the stirring and mixing process of the foaming agent and the mixed materials, the foaming is more uniform, and the stability and the water permeability of the product are improved.
Further, the stirring can be controlled to be carried out at the temperature of 50-70 ℃ and the rotation speed of 1000-; stirring for 1-3 min; molding to form compression molding; the curing is carried out under the conditions that the temperature is 60-80 ℃, the relative humidity is 80-90 percent and the absolute pressure is 0.8-1.2MPa, and the curing time is 8-12 h.
The process parameters improve the mixing degree of the mixed aggregate and the foaming agent, improve the foaming effect of the foaming agent, enable the foaming agent to be foamed more uniformly, and improve the compressive strength and the water permeability of the water permeable brick; in addition, the process parameters can also promote the cement particles to be fully hydrated, improve the bonding strength of the cement particles and further improve the strength of the water permeable brick.
Further, the prepared water permeable brick blank is calcined at the temperature of 850-900 ℃, the calcination time is 20-30min, and then the water permeable brick blank is cooled to the normal temperature.
The calcination conditions can promote the recrystallization of the raw materials in the water permeable brick blank, and are favorable for improving the overall strength and the water permeability of the water permeable brick. In the invention, the water permeability coefficient of the water permeable brick is 5 multiplied by 10-1cm/s or more; the compressive strength is more than 45 Mpa; the porosity is 30-45%.
The resource utilization method of the iron ore waste rock further comprises the following steps: preparing a 3D printing building material by taking the superfine aggregate smaller than 1mm as a raw material;
preferably, the raw materials of the 3D printing building material comprise 50-60 parts of the superfine aggregate, 30-50 parts of cement and 30-50 parts of water;
preferably, the preparation method of the 3D printing building material comprises:
according to the parts by weight, stirring and uniformly mixing materials comprising 50-60 parts of the superfine aggregate, 30-50 parts of cement and 30-50 parts of water; wherein the stirring speed is 500-800rpm, and the stirring time is 1-3 min.
In the preparation method, the precision of the 3D printing building material prepared by the superfine aggregate is high, and the strength of the 3D printing building material is improved by the specific proportion of the superfine aggregate, the cement and the water. In the invention, the compressive strength of the 3D printing building material reaches 40-60 MPa.
The resource utilization method of the iron ore waste rock further comprises the following steps: preparing a building component product by using the iron ore waste rock powder with the size of not more than 0.15mm as a raw material;
preferably, the raw materials of the building component comprise 10-45 parts of the iron ore waste rock powder, 50-65 parts of polyethylene master batch, 1-2 parts of surfactant and 1-2 parts of antioxidant;
preferably, the method for preparing the building element comprises the following steps:
according to the mass fraction, mixing the raw materials comprising 30-45 parts of iron ore waste stone powder, 50-65 parts of polyethylene master batch, 1-2 parts of surfactant and 1-2 parts of antioxidant, and then banburying and molding the mixed raw materials to obtain the building member product.
Further, the surfactant is selected from one of KH550 and KH 570.
Further, the antioxidant is a phosphite.
Further, the molding is compression molding.
In the preparation method, the interface performance of the iron ore waste rock powder and the polyethylene is improved by adding the surfactant, and the dispersity of the iron ore waste rock powder and the compatibility and bonding strength between the iron ore waste rock powder and the polyethylene are improved, so that the comprehensive performance of the building component prepared from the specific components is obviously improved; in addition, the addition of the antioxidant prevents the aging of the polymer, and prolongs the service life of the building member.
The process control conditions are favorable for processing and forming building components, and the yield of products is high.
Compared with the prior art, the invention has the beneficial effects that at least:
(1) according to the invention, the iron ore waste rock is crushed and sieved into the aggregates with different continuous particle sizes, and the aggregates are mixed according to a specific proportion to obtain the continuous graded mixed aggregates, so that the strength and the water permeability of the prepared product are improved, and the application range is wide.
(2) According to different product performance requirements, the proportion of the aggregates with different particle sizes in the mixed aggregates can be adjusted, the grading effect is achieved, and the performance requirements of the prepared product are improved.
(3) By utilizing the iron ore waste rock resources, the utilization rate of the iron ore waste rock resources is improved, the environmental pollution caused by the accumulation of the iron ore waste rock is reduced, and the manufacturing cost is reduced by adding the iron ore waste rock.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by manufacturers, and are all conventional products available on the market.
The raw materials used in the examples were as follows:
iron ore waste rock: the main component of the material is SiO2 35％-50％，CaO 10％-25％，MgO10％-15％，Fe2O310％-15％，Al2O36 to 15 percent; is derived from: hebei is from iron mine waste rock.
Example 1
The resource utilization method of the iron ore waste rock, in particular to a preparation method of an electric power tower, comprises the following steps:
crushing and screening iron ore waste stones to respectively obtain coarse aggregate of 10-30mm size fraction, medium aggregate of 5-10mm size fraction and fine aggregate of 1-5mm size fraction;
step two, mixing 30 parts of coarse aggregate, 20 parts of medium aggregate and 40 parts of fine aggregate according to the mass parts to obtain mixed aggregate;
step three, uniformly stirring 50 parts of mixed aggregate, 35 parts of water, 15 parts of No. 42.5 cement, 2 parts of lignosulfonate water reducing agent and 3 parts of citrate retarder by weight, wherein the stirring speed is 60rpm, and the stirring time is 1min to obtain a mixed material;
and step four, placing the mixed material into a power tower mold for molding, and maintaining at room temperature for 28 days to obtain the power tower.
The prepared product is subjected to compressive strength detection by using a GB4623-2014 annular concrete pole detection method, and the detection results are shown in Table 1.
Example 2
The resource utilization method of iron ore waste rock, specifically the preparation method of the precast tubular pile, includes the following steps:
crushing and screening iron ore waste stones to respectively obtain coarse aggregate of 10-30mm size fraction, medium aggregate of 5-10mm size fraction and fine aggregate of 1-5mm size fraction;
step two, mixing 30 parts of coarse aggregate, 25 parts of medium aggregate and 40 parts of fine aggregate according to the parts by weight to obtain mixed aggregate;
step three, uniformly stirring and mixing materials of 60 parts of mixed aggregate, 30 parts of water, 20 parts of No. 42.5 cement, 2 parts of amino acid sulfonate water reducer and 3 parts of phosphate retarder by weight, wherein the stirring speed is 50rpm, and the stirring time is 3min to obtain a mixed material;
and step four, placing the mixed material into a prefabricated tubular pile mould for forming, and then maintaining for 28 days at room temperature to obtain the prefabricated tubular pile.
The prepared product was tested for compressive strength using the test method of example 1, and the test results are shown in table 1.
Example 3
The resource utilization method of the iron ore waste rock, in particular to the preparation method of the pipe gallery, comprises the following steps:
crushing and screening iron ore waste stones to respectively obtain coarse aggregate of 10-30mm size fraction, medium aggregate of 5-10mm size fraction and fine aggregate of 1-5mm size fraction;
step two, mixing 30 parts of coarse aggregate, 25 parts of medium aggregate and 40 parts of fine aggregate according to the parts by weight to obtain mixed aggregate;
step three, uniformly stirring 55 parts of mixed aggregate, 35 parts of water, 20 parts of No. 42.5 cement, 2 parts of amino acid sulfonate water reducer and 3 parts of citrate retarder by mass, wherein the stirring speed is 60rpm, and the stirring time is 3min to obtain a mixed material;
and step four, placing the mixed material into a pipe gallery die for molding, and then maintaining for 28 days at room temperature to obtain the pipe gallery.
The prepared product was tested for compressive strength using the test method of example 1, and the test results are shown in table 1.
Example 4
The method for recycling iron ore waste rock, specifically the method for preparing the pipe gallery, according to the embodiment is the same as the preparation method of the embodiment 3, except that 10 parts of coarse aggregate, 30 parts of medium aggregate and 80 parts of fine aggregate are mixed in the step two to obtain mixed aggregate.
The prepared product was tested for compressive strength using the test method of example 1, and the test results are shown in table 1.
Example 5
The resource utilization method of the iron ore waste rock, in particular to the preparation method of the water permeable brick, comprises the following steps:
crushing and screening iron ore waste stones to respectively obtain coarse aggregate of 10-30mm size fraction, medium aggregate of 5-10mm size fraction and fine aggregate of 1-5mm size fraction;
step two, mixing 10 parts of coarse aggregate, 30 parts of medium aggregate and 60 parts of fine aggregate according to the mass parts to obtain mixed aggregate;
step three, stirring and uniformly mixing materials of 60 parts of mixed aggregate, 35 parts of water, 20 parts of No. 42.5 cement, 2 parts of foaming agent, 10 parts of lime, 2 parts of lignosulfonate water reducing agent and 1 part of citrate retarder according to parts by weight, and stirring at the temperature of 60 ℃ and the rotation speed of 1200rpm for 3min to obtain a mixed material;
fourthly, placing the mixed material into a brick making machine for forming, and then curing for 10 hours under the conditions of the temperature of 60 ℃, the relative humidity of 80% and the absolute pressure of 1MPa to obtain a permeable brick blank;
and fifthly, calcining the water permeable brick blank body for 25min at 900 ℃, and cooling to normal temperature to obtain the water permeable brick.
The water permeability coefficient, the compressive strength and the porosity of the prepared product are detected by adopting a JC/T945-2005 permeable brick detection method, and the detection result is that the compressive strength is 45MPa and the water permeability coefficient is 5 multiplied by 10-1cm/s, porosity 35%.
Example 6
The resource utilization method of the iron ore waste rock, in particular to the preparation method of the water permeable brick, comprises the following steps:
crushing and screening iron ore waste stones to respectively obtain coarse aggregate of 10-30mm size fraction, medium aggregate of 5-10mm size fraction and fine aggregate of 1-5mm size fraction;
step two, mixing 10 parts of coarse aggregate, 30 parts of medium aggregate and 60 parts of fine aggregate according to the mass parts to obtain mixed aggregate;
step three, stirring and uniformly mixing materials of 60 parts of mixed aggregate, 35 parts of water, 20 parts of No. 52.5 cement, 2 parts of foaming agent, 10 parts of lime, 2 parts of naphthalene sulfonate water reducing agent and 2 parts of tartrate retarder according to parts by weight, and stirring at the temperature of 60 ℃ and the rotation speed of 1200rpm for 3min to obtain a mixed material;
fourthly, placing the mixed materials into a brick making machine for forming, and then curing for 10 hours under the conditions of 80 ℃ of temperature, 80% of relative humidity and 1MPa of absolute pressure to obtain a permeable brick blank;
and fifthly, calcining the water permeable brick blank body for 25min at 900 ℃, and cooling to normal temperature.
The prepared product is detected by adopting the detection method of the fifth embodiment, and the detection result is that the compressive strength is 48MPa, and the water permeability coefficient is 2 multiplied by 10-1cm/s, porosity 25%.
Example 7
The method for recycling iron ore waste rock, specifically the method for preparing the water permeable brick, according to the embodiment is the same as the preparation method of the embodiment 5, and is different from the method for mixing 35 parts of coarse aggregate, 20 parts of medium aggregate and 40 parts of fine aggregate in the second step to obtain mixed aggregate.
The prepared product is detected by adopting the detection method of the fifth embodiment, and the detection result is that the compressive strength is 54MPa, and the water permeability coefficient is 5 multiplied by 10-2cm/s, porosity 12%.
Example 8
The resource utilization method of the iron ore waste rock, specifically the preparation method of the 3D printing building material, comprises the following steps:
according to the mass parts, stirring and uniformly mixing 60 parts of superfine aggregate, 30 parts of cement and 40 parts of water; wherein the stirring speed is 800rpm, and the stirring time is 3min, so that the 3D printing building material is obtained.
The prepared product is detected by adopting a GB/T50081-2002 ordinary concrete mechanical property test method, and the detection result is that the compressive strength is 45 MPa.
Example 9
The resource utilization method of the iron ore waste rock, specifically the preparation method of the 3D printing building material, comprises the following steps:
according to the mass parts, stirring and uniformly mixing 60 parts of superfine aggregate, 25 parts of cement and 40 parts of water; wherein the stirring speed is 800rpm, and the stirring time is 3min, so that the 3D printing building material is obtained.
The prepared product was tested by the test method of example 8, and the test result was 40MPa in compressive strength.
Example 10
The resource utilization method of the iron ore waste rock, in particular to the preparation method of the quartz plastic plate, comprises the following steps:
step one, mixing 30 parts of iron ore waste stone powder, 60 parts of polyethylene, KH5502 parts and 2 parts of phosphite ester to obtain a mixed raw material;
and step two, banburying and compression molding the mixed raw materials to prepare the quartz plastic plate.
The bending strength and the tensile strength of the quartz plastic composite board are detected by adopting a JG/T531-2017 municipal engineering and building quartz plastic composite board method, and the detection result is as follows: the flexural strength was 28.1MPa and the tensile strength was 16.2 MPa.
Example 11
The method for recycling iron ore waste rock, specifically the method for preparing the quartz plastic plate, of the embodiment is basically the same as that of embodiment 10, except that the surfactant is replaced by a zirconate coupling agent.
The bending strength and the tensile strength of the quartz plastic plate are detected by the detection method of the embodiment 10, and the detection result is as follows: the flexural strength was 18.3MPa and the tensile strength was 10.9 MPa.
Comparative example 1
The method for recycling iron ore waste rock in the comparative example is the preparation method of the pipe gallery, and is basically the same as the preparation method in the example 3, and the difference is only that the medium aggregate in the step two is replaced by the ultrafine aggregate in the same part.
The prepared product was tested for compressive strength using the test method of example 1, and the test results are shown in table 1.
Comparative example 2
The method for recycling iron ore waste rock in the comparative example is the preparation method of the pipe gallery, and is basically the same as the preparation method in the example 3, and the difference is only that the coarse aggregate in the step two is replaced by the medium aggregate in the same part.
The prepared product was tested for compressive strength using the test method of example 1, and the test results are shown in table 1.
Comparative example 3
The resource utilization method of the iron ore waste rock in the comparative example is a preparation method of the pipe gallery, and the method is basically the same as the preparation method in the example 3, and is different only in that 30 parts of cement is used in the third step.
The prepared product was tested for compressive strength using the test method of example 1, and the test results are shown in table 1.
Comparative example 4
The method for recycling iron ore waste rocks in the comparative example is the same as the preparation method in the example 5, and the difference is only that the coarse aggregate, the medium aggregate and the fine aggregate in the step two are replaced by the ultrafine aggregate in the same parts.
The prepared product is detected by adopting the detection method of the fifth embodiment, and the detection result is that the compressive strength is 38MPa, and the water permeability coefficient is 2 multiplied by 10-1cm/s, porosity 25%, the results of the test of this comparative example were compared with those of example 5, as shown in Table 2.
TABLE 1
As can be seen from table 1, it is,
1. according to the iron ore waste rock resource utilization product, the iron ore waste rock aggregate with different continuous particle sizes is mixed to achieve the continuous grading effect, and the overall compressive strength of the product is improved.
2. When the mixture ratio of the mixed aggregate, the cement and the water is not in the specific range, the compressive strength of the prepared product is obviously reduced; and when the particle size and the content of the iron ore waste rock aggregate with different particle sizes in the mixed aggregate exceed the specific range of the invention, the compressive strength of the prepared product is reduced.
TABLE 2
| Group of | Compressive strength (MPa) | Permeability coefficient (cm/s) | Porosity (%) |
| Example 5 | 45 | 5×10-1 | 35 |
| Comparative example 4 | 38 | 2×10-1 | 25 |
As can be seen from table 2 below, the results,
according to the invention, the compressive strength of the water permeable brick is ensured and the water permeability coefficient and porosity of the water permeable brick are improved by the specific proportion of the iron ore waste stone aggregate with different continuous particle sizes.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. A resource utilization method of iron ore waste rocks is characterized by comprising the following steps:
crushing and screening iron ore waste stones to respectively obtain coarse aggregate of 10-30mm size fraction, medium aggregate of 5-10mm size fraction, fine aggregate of 1-5mm size fraction, ultrafine aggregate smaller than 1mm and iron ore waste stone powder not larger than 0.15 mm;
step two, mixing 5-40 parts of coarse aggregate, 10-30 parts of medium aggregate and 30-80 parts of fine aggregate according to parts by weight to obtain mixed aggregate;
step three, stirring and uniformly mixing materials comprising 50-60 parts of mixed aggregate, 30-35 parts of water, 10-20 parts of cement, 1-2 parts of water reducing agent and 1-3 parts of retarder according to parts by weight to obtain a mixed material;
step four, molding and maintaining the mixed material to obtain a resource utilization product of iron ore waste rocks;
the iron ore waste rock resource utilization product is a water permeable brick, and in the second step, the mixed aggregate is obtained by mixing 5-10 parts of coarse aggregate, 10-30 parts of middle aggregate and 50-80 parts of fine aggregate;
when the iron ore waste rock resource utilization product is a water permeable brick, in the third step, the material also comprises 5-10 parts of lime and 0.2-2 parts of foaming agent;
when the iron ore waste rock resource utilization product is a water permeable brick, the stirring is carried out at the temperature of 50-70 ℃ and the rotating speed of 1000-1200rpm, and the stirring time is 1-3 min;
when the iron ore waste rock resource utilization product is a water permeable brick, in the fourth step, the maintenance is carried out at the temperature of 60-80 ℃, the relative humidity of 80-90% and the absolute pressure of 0.8-1.2MPa, and the maintenance time is 8-12 h;
when the iron ore barren rock resource utilization product is the brick that permeates water, still include: calcining the formed and maintained blank body at the temperature of 850-900 ℃ for 20-30min, and cooling to the normal temperature.
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| CN110028290A (en) * | 2019-05-14 | 2019-07-19 | 福州市鸿生建材有限公司 | A kind of ultra-fine aggregate concrete and preparation method thereof |
| 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 |
| CN111438795A (en) * | 2020-04-07 | 2020-07-24 | 张慧清 | Production process of mineral powder pad and application of mineral powder pad |
| CN112845524B (en) * | 2021-01-04 | 2023-02-21 | 包头钢铁（集团）有限责任公司 | Comprehensive utilization method of iron ore solid waste |
| CN113816637B (en) * | 2021-09-30 | 2023-08-15 | 西南科技大学 | Baking-free building block with chrysotile mine stripping waste stone as aggregate and preparation method thereof |
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