CN117567084A - Iron tailing-based full-solid waste baking-free brick and preparation method thereof - Google Patents
Iron tailing-based full-solid waste baking-free brick and preparation method thereof Download PDFInfo
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- CN117567084A CN117567084A CN202311563606.1A CN202311563606A CN117567084A CN 117567084 A CN117567084 A CN 117567084A CN 202311563606 A CN202311563606 A CN 202311563606A CN 117567084 A CN117567084 A CN 117567084A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 239000011449 brick Substances 0.000 title claims abstract description 85
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 58
- 239000002910 solid waste Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000002893 slag Substances 0.000 claims abstract description 78
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 239000010881 fly ash Substances 0.000 claims abstract description 36
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 claims abstract description 36
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 25
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000008399 tap water Substances 0.000 claims description 10
- 235000020679 tap water Nutrition 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000920 calcium hydroxide Substances 0.000 claims description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 description 13
- 239000012190 activator Substances 0.000 description 7
- 238000007580 dry-mixing Methods 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010883 coal ash Substances 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-IGMARMGPSA-N Calcium-40 Chemical group [40Ca] OYPRJOBELJOOCE-IGMARMGPSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910002800 Si–O–Al Inorganic materials 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229920000876 geopolymer Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
Classifications
-
- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses an iron tailing-based full-solid waste baking-free brick and a preparation method thereof, wherein the full-solid waste baking-free brick comprises the following components in parts by weight: 40-60 parts of iron tailings, 8-20 parts of electric furnace nickel iron slag, 5-12 parts of fly ash, 13-17 parts of phosphogypsum, 5-10 parts of steel slag and 3-8 parts of exciting agent. The baking-free brick prepared by the invention is prepared by adopting full solid waste cement-free, and has low economic cost and high solid waste utilization rate; the baking-free brick has the advantages of light weight, high strength and good water absorption performance.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of tailings, and particularly relates to an iron tailing-based full-solid waste baking-free brick and a preparation method thereof.
Background
The mining industry and the ferrous metallurgy industry are used as pulse-setting resources for the development of human society, play an irreplaceable role in improving the living level of human substances and bringing the peripheral industry into common progress, but inevitably discharge a large amount of solid wastes. The large-area piling and discharging of solid wastes such as iron tailings, phosphogypsum, electric furnace nickel-iron slag, fly ash, steel slag and the like not only occupies precious land resources, but also causes serious resource waste and ecological deterioration if reasonable treatment cannot be achieved, and is a main bottleneck for restricting sustainable development of the scientific society.
In the prior art, chinese patent publication No.: CN112279603a, publication day 2021, 1 and 29 discloses a red mud baking-free brick and a preparation method thereof, wherein the main raw materials are red mud, sulphoaluminate cement clinker or aluminate cement clinker mixed with 5% -15%, steel slag, silica fume and strontium slag, and although the red mud baking-free brick with good mechanical property is prepared, the cement clinker is added into the raw materials by the method, so that the production cost is increased.
Chinese patent publication No.: CN108840635a, publication date 2018 and 11 and 20 disclose a formula for making non-sintered brick from solid waste slag, which comprises solid waste slag, curing agent, rubber powder, cement and fly ash as main raw materials, and the non-sintered brick with light weight, good heat preservation, good anti-seepage effect and good sound insulation effect is prepared, however, the rubber powder and cement are added into the raw materials, so that the bonding effect between solid wastes is increased, but the compressive strength of the baking-free brick 7d is 8.2 MPa, the compressive strength of 28 d is 12.8 MPa, and the strength performance is poor.
Chinese patent publication No.: CN110395923a, publication date: the invention discloses a preparation method of a multi-element solid waste geopolymer-based baking-free brick in 2019, 11 and 1, wherein the method is prepared by mixing 2-3 dry materials in fly ash, ground red mud, metakaolin and gold tailings, and has the advantages of low cost and stable product performance, however, the inventor considers that: the method needs a pretreatment process of high-temperature calcination of raw materials in a specific implementation process, and the preparation process of the alkali-activated agent is complex.
Disclosure of Invention
The invention aims to overcome the problems of the prior solid waste baking-free brick technology and provides an iron tailing-based full solid waste baking-free brick and a preparation method thereof. The baking-free brick prepared by the invention is prepared by adopting full solid waste cement-free, and has low economic cost and high solid waste utilization rate; the baking-free brick has the advantages of light weight, high strength and good water absorption performance.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the iron tailing-based full-solid waste baking-free brick is characterized by comprising the following components in parts by weight: 40-60 parts of iron tailings, 8-20 parts of electric furnace nickel iron slag, 5-12 parts of fly ash, 13-17 parts of phosphogypsum, 5-10 parts of steel slag and 3-8 parts of exciting agent.
The iron tailings are used as aggregate, and the grain size is 0.5-2mm.
The specific surface area of the nickel-iron slag of the electric furnace is 550m 2 /kg。
The specific surface area of the fly ash is 500m 2 /kg。
The specific surface area of the phosphogypsum is 300m 2/ kg。
The specific surface area of the steel slag is 460m 2 /kg。
The excitant is a composite excitant and comprises the following components in parts by weight: 30-40 parts of sodium hydroxide, 30-40 parts of calcium hydroxide and 30-40 parts of potassium hydroxide.
The preparation method of the iron tailing-based full-solid waste baking-free brick comprises the following steps:
step S1: drying the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag to ensure that the water content is lower than 2%;
step S2: according to the weight portion ratio, the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag are mixed evenly by dry stirring;
step S3: adding common tap water into the uniformly mixed mixture, wherein the mass ratio of the common tap water to the mixture is 0.22-0.48:1, adding an exciting agent, and uniformly mixing to obtain green brick wet materials;
step S4: pressing and molding the green brick wet material to obtain a molded green brick;
step S5: and curing the formed green bricks to obtain the full solid waste baking-free bricks.
And in the step S4, placing the green brick wet material into a steel mold to be pressed and molded under the conditions of the vibration frequency of 3400-3600Hz, the molding pressure of 9-12MPa and the dwell time of 8-12S.
And (5) placing the formed green bricks in a curing box with the temperature of 20+/-2 ℃ and the humidity of 93% -97% for curing for 6-9d in the step (S5).
The invention has the advantages that:
1. the invention adopts the full solid waste cement-free preparation, and has low economic cost. The raw materials for preparing the whole baking-free brick are completely derived from mine waste and industrial waste, the application range of the raw materials is wide, the slag consumption is large, the utilization rate of solid waste resources is high, the problem of disposing the solid waste is solved, the problem of high energy consumption and high pollution in the traditional conversion process is solved, and the economic benefit and the environmental benefit are outstanding.
2. Fully exerts the synergetic and complementary action mechanism between solid wastes. The electric furnace nickel iron slag, the fly ash and the steel slag have potential gelation activity, under the erosion action of an alkaline excitant, the dissolution of the electric furnace nickel iron slag and the fly ash particles is accelerated, and the silicon oxygen bond and the aluminum oxygen bond in the glass phase network structure are continuously broken to generate a large number of oligomers which are mainly connected by Si-O-Si and Si-O-Al. Phosphogypsum provides Ca 2+ And SO 4 2- Recombination with active silicon and active aluminum in the hydration system promotes hydration product ettringite (3 CaO ∙ Al) 2 O 3 ∙3CaSO 4 ∙32H 2 O) and C-S-HxCaO∙SiO 2 ∙yH 2 O) gel formation. On the other hand, the steel slag is used as a calcium source, contains a large amount of dicalcium silicate and tricalcium silicate mineral phases and can be hydrated to generate Ca (OH) 2 An alkaline environment is provided for the hydration reaction of the steel slag, and hydration products ettringite and C-S-H gel are main sources of the baking-free bricks with high strength performance.
3. The baking-free brick prepared by the invention has light weight (volume density is 1762-1866 kg/m) 3 ) The high-strength (compressive strength is more than 17 MPa), low water absorption (water absorption is less than 18%), simple method, high universality and great application prospect.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided in detail, and it should be apparent that the embodiments described are merely some, but not all embodiments of the present invention. The detailed description is not to be taken as limiting, but is to be understood as a more detailed description of certain aspects, features, and embodiments of the invention.
Example 1
The iron tailing-based full-solid waste baking-free brick is mainly prepared from the following raw materials in parts by weight: 60 parts of iron tailings, 12 parts of electric furnace nickel-iron slag, 6 parts of fly ash, 14 parts of phosphogypsum, 5 parts of steel slag and 3 parts of composite activator (the components comprise 30 parts of sodium hydroxide, 40 parts of calcium hydroxide and 30 parts of potassium hydroxide). Wherein the iron tailings are used as aggregate, the grain diameter is 0.5-2mm, and the specific surface area of the nickel-iron slag of the electric furnace is 550m 2 Per kg, coal ash specific surface area 500m 2 Per kg, phosphogypsum specific surface area of 300m 2 Per kg, the specific surface area of the steel slag is 460m 2 /kg。
The preparation method of the baking-free brick comprises the following steps: step S1: drying the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag; step S2: pouring the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag into a stirrer according to the weight proportion, and carrying out dry mixing and uniform mixing; step S3: mixing common tap water with cementing material according to the proportion of 0.48: pouring the mixture into a stirrer according to the mass ratio of 1, and then adding an exciting agent, and uniformly mixing to obtain green brick wet materials; step S4: placing the green brick wet material into a steel mold, and pressing and forming under the conditions of 3500Hz vibration frequency, 10MPa forming pressure and 10s dwell time; step S5: and (3) placing the formed green bricks into a curing box with the temperature of 20+/-2 ℃ and the humidity of 95% for curing for 7 days, and thus obtaining the full solid waste baking-free bricks.
Example 2
The iron tailing-based full-solid waste baking-free brick is mainly prepared from the following raw materials in parts by weight: 55 parts of iron tailings, 10 parts of electric furnace nickel iron slag, 10 parts of fly ash, 13 parts of phosphogypsum, 7 parts of steel slag and 5 parts of composite activator (the components comprise 40 parts of sodium hydroxide, 30 parts of calcium hydroxide and 30 parts of potassium hydroxide). Wherein the iron tailings are used as aggregate, the grain diameter is 0.5-2mm, and the specific surface area of the nickel-iron slag of the electric furnace is 550m 2 Per kg, fly ash specific surface area 500m 2 Per kg, phosphogypsum specific surface area of 300m 2 Per kg, the specific surface area of the steel slag is 460m 2 /kg。
The preparation method of the baking-free brick comprises the following steps: step S1: drying the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag; step S2: pouring the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag into a stirrer according to the weight proportion, and carrying out dry mixing and uniform mixing; step S3: normal tap water and cementing material are mixed according to the proportion of 0.38: pouring the mixture into a stirrer according to the mass ratio of 1, and then adding an exciting agent, and uniformly mixing to obtain green brick wet materials; step S4: placing the green brick wet material into a steel mold, and pressing and forming under the conditions of 3500Hz vibration frequency, 10MPa forming pressure and 10s dwell time; step S5: and (3) placing the formed green bricks into a curing box with the temperature of 20+/-2 ℃ and the humidity of 95% for curing for 7 days, and thus obtaining the full solid waste baking-free bricks.
Example 3
The iron tailing-based full-solid waste baking-free brick is mainly prepared from the following raw materials in parts by weight: 50 parts of iron tailings, 20 parts of electric furnace nickel iron slag, 5 parts of fly ash, 17 parts of phosphogypsum, 10 parts of steel slag and 8 parts of composite activator (the components comprise 35 parts of sodium hydroxide, 30 parts of calcium hydroxide and 35 parts of potassium hydroxide). Wherein the iron tailings are used as aggregate, the grain diameter is 0.5-2mm, and the specific surface area of the nickel-iron slag of the electric furnace is 550m 2 Per kg, fly ash specific surface area 500m 2 Per kg, phosphogypsum specific surface area of 300m 2 Per kg, the specific surface area of the steel slag is 460m 2 /kg。
The preparation method of the baking-free brick comprises the following steps: step S1: drying the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag; step S2: pouring the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag into a stirrer according to the weight proportion, and carrying out dry mixing and uniform mixing; step S3: normal tap water and cementing material are mixed according to the proportion of 0.22: pouring the mixture into a stirrer according to the mass ratio of 1, and then adding an exciting agent, and uniformly mixing to obtain green brick wet materials; step S4: placing the green brick wet material into a steel mold, and pressing and forming under the conditions of 3500Hz vibration frequency, 10MPa forming pressure and 10s dwell time; step S5: and (3) placing the formed green bricks into a curing box with the temperature of 20+/-2 ℃ and the humidity of 95% for curing for 7 days, and thus obtaining the full solid waste baking-free bricks.
Example 4
The iron tailing-based full-solid waste baking-free brick is mainly prepared from the following raw materials in parts by weight: 50 parts of iron tailings, 8 parts of electric furnace nickel-iron slag, 12 parts of fly ash and phosphogypsum15 parts of steel slag 8 parts, and 7 parts of a composite activator (the components comprise 30 parts of sodium hydroxide, 35 parts of calcium hydroxide and 35 parts of potassium hydroxide). Wherein the iron tailings are used as aggregate, the grain size is 0.5-2mm, and the specific surface area of the nickel-iron slag of the electric furnace is 550m 2 Per kg, fly ash specific surface area 500m 2 Per kg, phosphogypsum specific surface area of 300m 2 Per kg, the specific surface area of the steel slag is 460m 2 /kg。
The preparation method of the baking-free brick comprises the following steps: step S1: drying the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag; step S2: pouring the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag into a stirrer according to the weight proportion, and carrying out dry mixing and uniform mixing; step S3: normal tap water and cementing material are mixed according to the proportion of 0.26: pouring the mixture into a stirrer according to the mass ratio of 1, and then adding an exciting agent, and uniformly mixing to obtain green brick wet materials; step S4: placing the green brick wet material into a steel mold, and pressing and forming under the conditions of 3500Hz vibration frequency, 10MPa forming pressure and 10s dwell time; step S5: and (3) placing the formed green bricks into a curing box with the temperature of 20+/-2 ℃ and the humidity of 95% for curing for 7 days, and thus obtaining the full solid waste baking-free bricks.
Example 5
The iron tailing-based full-solid waste baking-free brick is mainly prepared from the following raw materials in parts by weight: 45 parts of iron tailings, 15 parts of electric furnace nickel iron slag, 9 parts of fly ash, 16 parts of phosphogypsum, 9 parts of steel slag and 6 parts of composite activator (the components of the composite activator comprise 30 parts of sodium hydroxide, 30 parts of calcium hydroxide and 40 parts of potassium hydroxide). Wherein the iron tailings are used as aggregate, the grain diameter is 0.5-2mm, and the specific surface area of the nickel-iron slag of the electric furnace is 550m 2 Per kg, fly ash specific surface area 500m 2 Per kg, phosphogypsum specific surface area of 300m 2 Per kg, the specific surface area of the steel slag is 460m 2 /kg。
The preparation method of the baking-free brick comprises the following steps: step S1: drying the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag; step S2: pouring the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag into a stirrer according to the weight proportion, and carrying out dry mixing and uniform mixing; step S3: mixing common tap water with cementing material according to the proportion of 0.35: pouring the mixture into a stirrer according to the mass ratio of 1, and then adding an exciting agent, and uniformly mixing to obtain green brick wet materials; step S4: placing the green brick wet material into a steel mold, and pressing and forming under the conditions of 3500Hz vibration frequency, 10MPa forming pressure and 10s dwell time; step S5: and (3) placing the formed green bricks into a curing box with the temperature of 20+/-2 ℃ and the humidity of 95% for curing for 7 days, and thus obtaining the full solid waste baking-free bricks.
Example 6
The iron tailing-based full-solid waste baking-free brick is mainly prepared from the following raw materials in parts by weight: 52 parts of iron tailings, 18 parts of electric furnace nickel iron slag, 7 parts of fly ash, 13 parts of phosphogypsum, 6 parts of steel slag and 4 parts of composite activator (the components comprise 35 parts of sodium hydroxide, 35 parts of calcium hydroxide and 30 parts of potassium hydroxide). Wherein the iron tailings are used as aggregate, the grain diameter is 0.5-2mm, and the specific surface area of the nickel-iron slag of the electric furnace is 550m 2 Per kg, coal ash specific surface area 500m 2 Per kg, phosphogypsum specific surface area of 300m 2 Per kg, the specific surface area of the steel slag is 460m 2 /kg。
The preparation method of the baking-free brick comprises the following steps: step S1: drying the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag; step S2: pouring the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag into a stirrer according to the weight proportion, and carrying out dry mixing and uniform mixing; step S3: normal tap water and cementing material are mixed according to the proportion of 0.45: pouring the mixture into a stirrer according to the mass ratio of 1, and then adding an exciting agent, and uniformly mixing to obtain green brick wet materials; step S4: placing the green brick wet material into a steel mold, and pressing and forming under the conditions of 3500Hz vibration frequency, 10MPa forming pressure and 10s dwell time; step S5: and (3) placing the formed green bricks into a curing box with the temperature of 20+/-2 ℃ and the humidity of 95% for curing for 7 days, and thus obtaining the full solid waste baking-free bricks.
Performance testing
The baking-free bricks prepared in the examples were subjected to performance test, and the results are shown in table 1.
Table 1 results of testing the properties of baking-free bricks
From the detection data in table 1, it can be seen that the baking-free brick made of the iron tailing-based total solid waste has the advantages of minimum compressive strength up to 17.2MPa, maximum compressive strength up to 25.8MPa, maximum water absorption up to 11.4%, light weight, high strength and low water absorption.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes, substitutions and alterations made hereto are therefore intended to be embraced therein.
Claims (10)
1. The iron tailing-based full-solid waste baking-free brick is characterized by comprising the following components in parts by weight: 40-60 parts of iron tailings, 8-20 parts of electric furnace nickel iron slag, 5-12 parts of fly ash, 13-17 parts of phosphogypsum, 5-10 parts of steel slag and 3-8 parts of exciting agent.
2. The iron tailing-based all-solid-waste baking-free brick as set forth in claim 1, wherein: the iron tailings are used as aggregate, and the grain size is 0.5-2mm.
3. The iron tailing-based all-solid-waste baking-free brick according to claim 1 or 2, wherein: the specific surface area of the nickel-iron slag of the electric furnace is 550m 2 /kg。
4. The iron tailing-based all-solid-waste baking-free brick as set forth in claim 3, wherein: the specific surface area of the fly ash is 500m 2 /kg。
5. The iron tailing-based all-solid-waste baking-free brick according to claim 1, 2 or 4, wherein: the specific surface area of the phosphogypsum is 300m 2/ kg。
6. The iron tailing-based all-solid-waste baking-free brick as set forth in claim 5, wherein: the specific surface area of the steel slag is 460m 2 /kg。
7. The iron tailing-based all-solid-waste baking-free brick of claim 1, 2, 4 or 6, wherein: the excitant is a composite excitant and comprises the following components in parts by weight: 30-40 parts of sodium hydroxide, 30-40 parts of calcium hydroxide and 30-40 parts of potassium hydroxide.
8. The method for preparing the iron tailing-based all-solid-waste baking-free brick, as claimed in claim 1, is characterized by comprising the following steps:
step S1: drying the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag to ensure that the water content is lower than 2%;
step S2: according to the weight portion ratio, the iron tailings, the electric furnace nickel-iron slag, the fly ash, the phosphogypsum and the steel slag are mixed evenly by dry stirring;
step S3: adding common tap water into the uniformly mixed mixture, wherein the mass ratio of the common tap water to the mixture is 0.22-0.48:1, adding an exciting agent, and uniformly mixing to obtain green brick wet materials;
step S4: pressing and molding the green brick wet material to obtain a molded green brick;
step S5: and curing the formed green bricks to obtain the full solid waste baking-free bricks.
9. The method for preparing the iron tailing-based all-solid-waste baking-free brick, as claimed in claim 8, is characterized in that: and in the step S4, placing the green brick wet material into a steel mold to be pressed and molded under the conditions of the vibration frequency of 3400-3600Hz, the molding pressure of 9-12MPa and the dwell time of 8-12S.
10. The method for preparing the iron tailing-based all-solid-waste baking-free brick according to claim 8 or 9, which is characterized by comprising the following steps: and (5) placing the formed green bricks in a curing box with the temperature of 20+/-2 ℃ and the humidity of 93% -97% for curing for 6-9d in the step (S5).
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