CN116553851A - Artificial aggregate based on waste gypsum and metal tailings and preparation method thereof - Google Patents
Artificial aggregate based on waste gypsum and metal tailings and preparation method thereof Download PDFInfo
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- CN116553851A CN116553851A CN202310466988.XA CN202310466988A CN116553851A CN 116553851 A CN116553851 A CN 116553851A CN 202310466988 A CN202310466988 A CN 202310466988A CN 116553851 A CN116553851 A CN 116553851A
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- waste gypsum
- metal tailings
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 57
- 239000010440 gypsum Substances 0.000 title claims abstract description 57
- 239000002699 waste material Substances 0.000 title claims abstract description 54
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 50
- 239000002184 metal Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical group O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 19
- 239000002893 slag Substances 0.000 claims description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 239000011707 mineral Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 229910052612 amphibole Inorganic materials 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 239000010433 feldspar Substances 0.000 claims description 3
- 239000002223 garnet Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052611 pyroxene Inorganic materials 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 239000002910 solid waste Substances 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007795 chemical reaction product Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000001879 gelation Methods 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000004567 concrete Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000009776 industrial production Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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
- C04B18/0445—Synthetic gypsum, e.g. phosphogypsum
-
- 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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/062—Purification products of smoke, fume or exhaust-gases
- C04B18/064—Gypsum
-
- 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
-
- 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
Abstract
The invention relates to an artificial aggregate based on waste gypsum and metal tailings, which comprises 60-70 parts of waste gypsum, 30-40 parts of metal tailings, 15-20 parts of cement, the water-cement ratio is 0.4-0.8, and the dispersing agent is 0.1-1.3 parts. The preparation method comprises the following steps: preliminary stirring and dispersing are carried out on the waste gypsum, the metal tailings and the cement; pouring water, and continuing stirring to form aggregate slurry; adding a dispersing agent into the aggregate slurry, and continuing stirring; pouring the fluid aggregate slurry into a layered grid-shaped mold, demolding and curing to obtain the aggregate with the required particle size. The beneficial effects of the invention are as follows: the advantages of high hardness and good chemical stability of the metal tailing particles are fully utilized, the defects of low hardness and poor chemical stability of the waste gypsum powder are overcome, the metal tailing particles and the waste gypsum powder are connected through cement hydration reaction products to form aggregate particles meeting specifications by utilizing the gelation of cement, and the recycling utilization of the waste gypsum and the metal tailings is realized.
Description
Technical Field
The invention relates to the technical field of civil engineering materials, in particular to an artificial aggregate based on waste gypsum and metal tailings and a preparation method thereof.
Background
The industrial production produces a large amount of waste gypsum, the waste gypsum is industrial waste residue mainly containing calcium sulfate, and the waste gypsum is in powder form, wherein 80 percent of the waste gypsum is calcium sulfate, and silicon, aluminum, iron and other components, if the waste gypsum cannot be scientifically and reasonably used, a large amount of land resources can be occupied, and certain damage is caused to soil, water resources and the like.
The exploitation of metal mines produces a large amount of metal tailings, and a large amount of tailings are thrown to a tailings pond or a tailings dam, so that the tailings not only occupy the land to generate dust, but also have geological potential safety hazards, and in addition, the tailings are not fully utilized due to the limitation of the technical level.
The sand aggregate is an indispensable foundation material with the largest construction consumption of infrastructure engineering such as buildings, roads, bridges and the like. However, the sand aggregate belongs to non-renewable resources, and a large amount of waste gypsum and metal tailings are generated in the long-term production process of industrial production and metal mining in China, and the sand aggregate can be completely or partially replaced by the resources, so that the artificial aggregate based on the waste gypsum and the metal tailings, which meets the requirements of recycled aggregate concrete, has very important significance for recycling the waste resources.
The patent CN114956628A discloses a high-strength phosphogypsum-based regenerated aggregate and a preparation method thereof, wherein the mixed materials formed by adding water after mixing phosphogypsum, slag powder, cement clinker, steel slag powder, fly ash, silica fume and residual slurry of a pipe pile are added into a ring die granulator, and are subjected to compression molding by adopting a ring die and a compression roller, and then carbonization maintenance and natural maintenance are carried out.
Patent CN115611539A discloses a regenerated aggregate prepared by steel slag and phosphogypsum, a roadbed material and a preparation method thereof, and the whole process flow comprises the following steps: 1) The steel slag is ground and then is screened into steel slag powder and steel slag particles; 2) The steel slag powder, phosphogypsum and slag are formed into a mixture, the mixture and the admixture are uniformly stirred according to a certain proportion, and then the mixture is fed into a superfine grinding system to be ground until the specific surface area is not less than 450 m-2/kg, so as to prepare the roadbed cementing agent; 3) Mixing heavy metal pollution viscosity class, sand class soil or tailing and roadbed cementing agent, adding water, stirring uniformly, and producing the regenerated aggregate through a disc granulator.
Patent CN115677306a discloses a green artificial aggregate based on phosphogypsum and a preparation method thereof, phosphogypsum and garbage incineration bottom slag are adopted as main raw materials, and the whole process flow comprises: drying the garbage incineration bottom slag, mixing and stirring cement and phosphogypsum, pouring the dried garbage incineration bottom slag into a granulator, spraying water into the granulator, then spraying the mixed powder into the granulator, and continuously spraying water and spraying the mixed powder until the particle size of agglomerated particles reaches more than 4.75mm, thereby obtaining the green artificial aggregate containing phosphogypsum.
In general, the preparation of the artificial aggregate basically needs to use a granulator, the process power consumption is higher, certain technical requirements are provided for operation and use, the moisture content of raw materials is required to be lower, and the popularization and the application of the waste gypsum artificial aggregate are not facilitated.
Disclosure of Invention
The invention aims to solve the technical problem of environmental pollution caused by difficulty in treatment of a large amount of waste gypsum generated in the existing industrial production and a large amount of tailings formed in metal mine exploitation, and provides an artificial aggregate based on the waste gypsum and the metal tailings and a preparation method thereof, and the comprehensive utilization range of the waste gypsum and the metal tailings is widened.
The technical scheme for solving the technical problems is as follows: an artificial aggregate based on waste gypsum and metal tailings comprises the following raw materials in percentage by mass:
waste gypsum: 60-70 parts of metal tailings: 30-40 parts of cement: 15-20 parts of water-cement ratio of 0.4-0.8, and dispersing agent: 0.1 to 1.3 parts.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the waste gypsum is phosphogypsum or desulfurized gypsum.
Furthermore, phosphogypsum is derived from solid waste generated in the wet-process phosphoric acid process, the particle size of the phosphogypsum is 5-50 mu m, the content of crystal water is 20-25%, and the phosphogypsum mainly contains calcium sulfate dihydrate and also contains a small amount of impurities.
Still further, the desulfurized gypsum is derived from a byproduct of the FGD process, which is CaSO 4 〃2H 2 The O content is more than or equal to 90 percent, the grain diameter is 30-100 mu m, and the free water content is 10-17 percent.
Further, the metal tailings are iron ore sand.
Further, the iron ore sand is the residual waste residue of the iron ore after the iron ore concentrate is selected, and the mineral component is gangue mineral.
Still further, gangue minerals include: quartz, pyroxene, feldspar, garnet, amphibole and altered minerals thereof.
Further, the cement is slag portland cement.
Based on the technical scheme, the invention also provides a preparation method of the artificial aggregate based on the waste gypsum and the metal tailings, which comprises the following specific steps:
s01, primarily stirring and dispersing the waste gypsum, the metal tailings and the cement;
s02, pouring water, and continuing stirring to form aggregate slurry;
s03, adding a dispersing agent into the aggregate slurry, and continuously stirring to form fluid aggregate slurry;
s04, pouring the fluid aggregate slurry into a layered grid-shaped mold, demolding and curing to obtain the aggregate with the required particle size.
The beneficial effects of the invention are as follows:
1) The chemical properties of the waste gypsum are unstable, the hardness of solid particles formed by chemical reaction is small, the hardness of metal tailings particles is large, the chemical properties are stable, cement is used as a cementing material and is fully and uniformly mixed with water, the waste gypsum and the metal tailings, a dispersing agent is used for improving the fluidity of a mixture formed by the waste gypsum, the metal tailings, the cement and the water, when the fluidity meets the pouring requirement, the mixture is poured into a layered grid-shaped mold, and demolding and curing are carried out to form the concrete aggregate meeting the index requirement of the national standard of sand stone and crushed stone for construction (CBT 14685-2011);
the invention makes full use of the advantages of large hardness and good chemical stability of the metal tailing particles, makes up the defects of low hardness and poor chemical stability of the waste gypsum powder, connects the metal tailing particles and the waste gypsum powder through cement hydration reaction products to form aggregate particles meeting specifications by utilizing the gelation of cement, thereby realizing the recycling utilization of phosphogypsum and metal tailings, saving the cost of raw materials and protecting the environment;
2) Compared with the traditional aggregate, the aggregate provided by the invention has the advantages that the strength is greatly improved, and aggregates with different particle diameters can be produced through a layered grid-shaped die;
3) Compared with the traditional comprehensive utilization method of waste gypsum and the metal tailing treatment method, the aggregate provided by the method is simple in manufacturing process and low in cost, does not need traditional granulation machinery, can consume a large amount of waste gypsum generated in industrial production and a large amount of tailings generated in metal mining, and has important popularization value.
Drawings
Fig. 1 is an exploded view of a layered mesh mold according to the present invention.
Detailed Description
The principles and features of the present invention are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the invention.
The artificial aggregate based on the waste gypsum and the metal tailings comprises the following raw materials in percentage by mass:
waste gypsum: 60-70 parts of metal tailings: 30-40 parts of cement: 15-20 parts of water-cement ratio of 0.4-0.8, and dispersing agent: 0.1 to 1.3 parts.
Further: the waste gypsum is phosphogypsum or desulfurized gypsum;
phosphogypsum is derived from solid waste generated in a wet phosphoric acid process, has the particle size of 5-50 mu m, the content of crystal water of 20-25%, mainly comprises calcium sulfate dihydrate, and also contains a small amount of phosphorus, fluorine, organic matters, oxides, a small amount of heavy metals, radioactive substances and other impurities;
desulfurized gypsum is derived from a byproduct of the FGD process, its CaSO 4 〃2H 2 The O content is more than or equal to 90 percent, the grain diameter is 30-100 mu m, and the free water content is 10 percent.
The metal tailings are iron ore sand, are composite mineral raw materials, are residual waste residues of iron ore after iron ore concentrate selection, and are mainly composed of gangue minerals except a small amount of metal components, wherein the gangue minerals comprise: quartz, pyroxene, feldspar, garnet, amphibole and altered minerals thereof;
the cement is slag silicate cement, and the dispersant adopts the application number: 2022108256858.
In this embodiment, 12 sets of examples are set, see table 1 for specific details:
table 1 example
The schematic structural diagram of the adopted layered latticed mold is shown in fig. 1, and the layered latticed mold comprises: the periphery baffle 1, the periphery baffle 1 comprises five blocks of front, back, left, right and lower, the cube without cover is assembled, the grid tray 2 is assembled by the transverse partition plate 3 and the longitudinal partition plate 5 through the opening slot 4, the assembled grid tray 2 is placed into the cube without cover, an inner flat plate 6 is placed after each layer of aggregate slurry with the flow state is poured, and then the process is repeated until the cube without cover is filled, the upper surface of the cube without cover is sealed by the periphery baffle 1, and the transverse partition plate 3 and the longitudinal partition plate 5 with proper opening slot distances are selected according to the size of the aggregate required.
Slump is used for reflecting the fluidity of the slurry of the material, and the measuring method comprises the following steps: filling aggregate slurry into a trumpet-shaped slump barrel with an upper opening of 100mm, a lower opening of 200mm and a height of 300mm for three times, uniformly beating 25 downwards along the barrel wall by using a rammer after each filling, and trowelling after tamping; then the bucket is pulled up, the aggregate slurry is slumped due to the dead weight, and the height of the highest point of the aggregate slurry after slumping is subtracted by the bucket height (300 mm), which is called slump.
The curing strength of the artificial aggregate of the waste gypsum and the metal tailings is expressed by unconfined compressive strength, and the measuring method comprises the following steps: and (3) selecting a cube test die with the dimensions of 70.5mm multiplied by 70.5mm, pouring the concrete test die by using fluid state solidified soil, demolding after 48 hours, placing the test die into a standard curing room with the temperature of 20+/-2 ℃ and the relative humidity of more than 95% for curing for 28 days, and testing the compressive strength of a test piece by using an unconfined single-shaft press.
The crushing index, firmness and organic matters are used as comprehensive performance indexes to check whether the regenerated aggregate meets the standard, and the determination method comprises the following steps:
crush index is the ratio of the weight of crushed crumb to the total weight of the test specimen, expressed as a percentage, as measured by a specified test method. The method comprises the following steps: loading 9.5-13.2 mm stones in a certain quality air-dried state into a cylinder with certain specification, applying simple load to 400000N for 10 minutes on a press machine, static pressure for 5 seconds, weighing the sample mass after unloading, screening out crushed fine particles by using a sieve with the aperture of 2.36 mm, weighing the screen residue of the pattern, and calculating to obtain a crushing index;
crush value, firmness value and organic matter content determination of regenerated aggregate reference national standards for sandstone, macadam for construction (CBT 14685-2011), as shown in table 2:
TABLE 2 comprehensive performance index of regenerated aggregate
The artificial aggregates of examples 1 to 12 in table 1 were tested for standard with respect to crush index, firmness and organic matter as comprehensive performance index, and the measurement data are shown in table 3:
as is clear from Table 3, the crushing index, the firmness and the organic matter content of the artificial aggregate all reach the standards, namely, the artificial aggregate has good comprehensive performance, wherein the waste gypsum 50%, the metal tailings 33%, the cement 17% and the water-cement ratio of 0.7 are the best in the embodiment 4.
The slump, 28d unconfined compressive strength test was performed on the artificial aggregates of examples 1-12 in table 1, and the data are shown in table 4:
as can be seen from Table 4, the artificial aggregates of examples 1 to 12 all meet the casting requirements, and the 28d unconfined compressive strength reaches 30MPa, especially example 4, which has the highest strength.
The mixture performance, mechanical performance, durability and the like of the regenerated aggregate concrete are measured by selecting the ratio (example 4) with the best comprehensive performance of the artificial aggregate of the waste gypsum and the metal tailings, which accords with the specification of the current national standard 'concrete quality control standard' GB 50164, so the artificial aggregate based on the waste gypsum and the metal tailings can replace the application of concrete sand in engineering.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. The artificial aggregate based on the waste gypsum and the metal tailings is characterized by comprising the following raw material components in percentage by mass:
waste gypsum: 60-70 parts of metal tailings: 30-40 parts of cement: 15-20 parts of water-cement ratio of 0.4-0.8, and dispersing agent: 0.1 to 1.3 parts.
2. An artificial aggregate based on waste gypsum and metal tailings according to claim 1, wherein the waste gypsum is phosphogypsum or desulphurized gypsum.
3. The artificial aggregate based on waste gypsum and metal tailings according to claim 1 or 2, wherein the phosphogypsum is derived from solid waste generated in the wet process phosphoric acid, has a particle size of 5-50 μm, a crystal water content of 20-25%, and comprises calcium sulfate dihydrate as a main component and a small amount of impurities.
4. An artificial aggregate based on waste gypsum and metal tailings according to claim 1 or 2 or 3, wherein the desulphurized gypsum is derived from a by-product of the FGD process, caSO thereof 4 〃2H 2 The O content is more than or equal to 90 percent, the grain diameter is 30-100 mu m, and the free water content is 10-17 percent.
5. An artificial aggregate based on waste gypsum and metal tailings according to claim 1, wherein the metal tailings are iron ore.
6. An artificial aggregate based on waste gypsum and metal tailings according to claim 5, wherein the iron ore sand is the residue of iron ore after selecting iron ore concentrate, and the mineral component is gangue mineral.
7. An artificial aggregate based on waste gypsum and metal tailings according to claim 6, wherein the gangue minerals comprise: quartz, pyroxene, feldspar, garnet, amphibole and altered minerals thereof.
8. An artificial aggregate based on waste gypsum and metal tailings according to claim 1, wherein the cement is slag portland cement.
9. A method for preparing an artificial aggregate based on waste gypsum and metal tailings according to any one of claims 1 to 8, comprising the specific steps of:
s01, primarily stirring and dispersing the waste gypsum, the metal tailings and the cement;
s02, pouring water, and continuing stirring to form aggregate slurry;
s03, adding a dispersing agent into the aggregate slurry, and continuously stirring to form fluid aggregate slurry;
s04, pouring the fluid aggregate slurry into a layered grid-shaped mold, demolding and curing to obtain the aggregate with the required particle size.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310466988.XA CN116553851A (en) | 2023-04-27 | 2023-04-27 | Artificial aggregate based on waste gypsum and metal tailings and preparation method thereof |
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| CN202310466988.XA CN116553851A (en) | 2023-04-27 | 2023-04-27 | Artificial aggregate based on waste gypsum and metal tailings and preparation method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103342481A (en) * | 2013-07-08 | 2013-10-09 | 武汉理工大学 | Mine filling cementing material slurry and preparation method thereof |
| CN106348713A (en) * | 2016-08-30 | 2017-01-25 | 北京玉锦资源与环境技术研究院（有限合伙） | Cementing filling material for co-processing copper-containing dangerous waste of mine and preparation method of cementing filling material |
| CN113354376A (en) * | 2021-06-23 | 2021-09-07 | 武汉理工大学 | Phosphogypsum-based aggregate and preparation method thereof |
| CN114436570A (en) * | 2021-12-06 | 2022-05-06 | 武汉三源特种建材有限责任公司 | Roadbed filling material and preparation method thereof |
| CN114940611A (en) * | 2022-05-25 | 2022-08-26 | 武汉工程大学 | Flow-state solidified soil based on gold tailings and preparation method thereof |
| CN115259815A (en) * | 2021-04-30 | 2022-11-01 | 广东清大同科环保技术有限公司 | Preparation method of metal tailing artificial aggregate |
| CN115677306A (en) * | 2022-10-28 | 2023-02-03 | 深圳大学 | Green artificial aggregate based on phosphogypsum and preparation method thereof |
-
2023
- 2023-04-27 CN CN202310466988.XA patent/CN116553851A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103342481A (en) * | 2013-07-08 | 2013-10-09 | 武汉理工大学 | Mine filling cementing material slurry and preparation method thereof |
| CN106348713A (en) * | 2016-08-30 | 2017-01-25 | 北京玉锦资源与环境技术研究院（有限合伙） | Cementing filling material for co-processing copper-containing dangerous waste of mine and preparation method of cementing filling material |
| CN115259815A (en) * | 2021-04-30 | 2022-11-01 | 广东清大同科环保技术有限公司 | Preparation method of metal tailing artificial aggregate |
| CN113354376A (en) * | 2021-06-23 | 2021-09-07 | 武汉理工大学 | Phosphogypsum-based aggregate and preparation method thereof |
| CN114436570A (en) * | 2021-12-06 | 2022-05-06 | 武汉三源特种建材有限责任公司 | Roadbed filling material and preparation method thereof |
| CN114940611A (en) * | 2022-05-25 | 2022-08-26 | 武汉工程大学 | Flow-state solidified soil based on gold tailings and preparation method thereof |
| CN115677306A (en) * | 2022-10-28 | 2023-02-03 | 深圳大学 | Green artificial aggregate based on phosphogypsum and preparation method thereof |
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