CN116282988A - Method for preparing low-calcium solid carbon gel material by using phosphogypsum - Google Patents
Method for preparing low-calcium solid carbon gel material by using phosphogypsum Download PDFInfo
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- CN116282988A CN116282988A CN202310264754.7A CN202310264754A CN116282988A CN 116282988 A CN116282988 A CN 116282988A CN 202310264754 A CN202310264754 A CN 202310264754A CN 116282988 A CN116282988 A CN 116282988A
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 79
- 239000000463 material Substances 0.000 title claims abstract description 74
- 239000011575 calcium Substances 0.000 title claims abstract description 72
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 72
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000007787 solid Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 120
- 239000002989 correction material Substances 0.000 claims abstract description 26
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000227 grinding Methods 0.000 claims abstract description 14
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 31
- 238000000354 decomposition reaction Methods 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000010304 firing Methods 0.000 claims description 12
- 235000019738 Limestone Nutrition 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000006028 limestone Substances 0.000 claims description 11
- 229910001570 bauxite Inorganic materials 0.000 claims description 6
- 235000012054 meals Nutrition 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 3
- 229910052570 clay Inorganic materials 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000571 coke Substances 0.000 claims 1
- 238000003763 carbonization Methods 0.000 abstract description 21
- 238000012423 maintenance Methods 0.000 abstract description 18
- 229910010272 inorganic material Inorganic materials 0.000 abstract description 2
- 239000011147 inorganic material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 17
- 239000000126 substance Substances 0.000 description 16
- 230000018044 dehydration Effects 0.000 description 12
- 238000006297 dehydration reaction Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 9
- 238000005265 energy consumption Methods 0.000 description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 description 7
- 239000011707 mineral Substances 0.000 description 7
- 235000010755 mineral Nutrition 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 239000004568 cement Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 208000016261 weight loss Diseases 0.000 description 3
- 230000004580 weight loss Effects 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- ZHZFKLKREFECML-UHFFFAOYSA-L calcium;sulfate;hydrate Chemical group O.[Ca+2].[O-]S([O-])(=O)=O ZHZFKLKREFECML-UHFFFAOYSA-L 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000003054 catalyst Substances 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
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- -1 organic matters Chemical compound 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- VQNBUJAEBQLLKU-UHFFFAOYSA-H tricalcium;diphosphate;hydrate Chemical compound O.[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VQNBUJAEBQLLKU-UHFFFAOYSA-H 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/364—Avoiding environmental pollution during cement-manufacturing
- C04B7/367—Avoiding or minimising carbon dioxide emissions
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Public Health (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention provides a method for preparing a low-calcium solid carbon gel material by using phosphogypsum, belonging to the technical field of inorganic materials. The method for preparing the low-calcium solid carbon gel material by using phosphogypsum provided by the invention comprises the following steps: (1) Mixing phosphogypsum, a calcareous raw material, a siliceous raw material, an iron-aluminum correction material and a carbonaceous raw material to obtain a mixed raw material; (2) And (3) preheating, pre-decomposing, sintering and grinding the mixed raw material obtained in the step (1) in sequence to obtain the low-calcium solid-carbon gel material. The results of the examples show that the compressive strength of the low-calcium solid carbon gel material provided by the invention is more than or equal to 45MPa after carbonization and maintenance for 2 hours, the compressive strength of the low-calcium solid carbon gel material after carbonization and maintenance for 24 hours is more than or equal to 77MPa, the flexural strength of the low-calcium solid carbon gel material after carbonization and maintenance for 2 hours is more than or equal to 11MPa, and the flexural strength of the low-calcium solid carbon gel material after carbonization and maintenance for 24 hours is more than or equal to 19MPa.
Description
Technical Field
The invention relates to the technical field of inorganic materials, in particular to a method for preparing a low-calcium solid carbon gel material by using phosphogypsum.
Background
Phosphoric acid is a great demand in various fields as an industrial product, and a great amount of phosphogypsum is produced as a solid waste in the process of preparing phosphoric acid by a wet method. The main composition of phosphogypsum is calcium sulfate hydrate, the content of calcium phosphate hydrate in the solid content of most phosphogypsum is more than 90%, and in addition, a small amount of by-product silicon dioxide after the reaction of phosphate ore is also included, and fluoride, organic matters, phosphoric acid and unreacted phosphate ore remain in the reaction process. These components other than hydrated calcium sulfate greatly raise the hazard of phosphogypsum and significantly reduce the availability. At present, about 8000 ten thousand tons of phosphogypsum can be produced each year, the total stacking amount is over 4 hundred million tons, and the large-scale resource utilization of phosphogypsum becomes a serious environmental problem to be solved urgently.
The preparation of building materials from phosphogypsum is a reliable way for large-scale absorption of phosphogypsum, and the existing production of cement from phosphogypsum has a mature technology, but has serious problems. The most difficult problem to solve is that the elemental sulfur of phosphogypsum inhibits tricalcium silicate (C 3 S) the generation of ore phase finally leads to the remarkable reduction of the quality of cement clinker, so the prior art has extremely high requirement on the desulfurization rate of phosphogypsum, the prior art is to improve the pre-decomposition temperature, or a double-atmosphere decomposing furnace is arranged by reforming the prior production line, and finally the higher desulfurization rate is realized, but the technical route has extremely high energy consumption, the carbon emission is larger and is contrary to the double-carbon strategy of the prior country, and the prior equipment and the prior production line are required to be reformed, so the method has higher cost and is difficult to realize. The low-calcium solid carbon gel material has low carbon emission due to low calcium-silicon ratio in the production process, and can obtain mechanical strength by solidifying carbon dioxide, so that the low-calcium solid carbon gel material is a good environment-friendly building material. If the phosphogypsum can be used for producing the low-calcium solid carbon gel material, the large-scale resource utilization of the phosphogypsum and the carbon neutralization of the building material industry can be simultaneously realized. There is a need to develop a method for preparing low-calcium solid-carbon gel materials from phosphogypsum, which has low energy consumption and excellent mechanical properties.
Disclosure of Invention
The invention aims to provide a method for preparing a low-calcium solid-carbon gel material by using phosphogypsum, which is low in required decomposition temperature and energy consumption, and the prepared low-calcium solid-carbon gel material has excellent compressive strength and flexural strength.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for preparing a low-calcium solid carbon gel material by using phosphogypsum, which comprises the following steps:
(1) Mixing phosphogypsum, a calcareous raw material, a siliceous raw material, an iron-aluminum correction material and a carbonaceous raw material to obtain a mixed raw material;
(2) And (3) preheating, pre-decomposing, sintering and grinding the mixed raw material obtained in the step (1) in sequence to obtain the low-calcium solid-carbon gel material.
Preferably, in the step (1), the calcareous raw material comprises one or more of limestone, slaked lime and carbide slag, the siliceous raw material comprises one or more of sandstone, shale, silica, clay and quartz powder, the ferroaluminum correction material comprises one or more of iron powder, bauxite and red mud, and the carbonaceous raw material comprises one or more of pulverized coal and coke powder.
Preferably, the mass ratio of the calcareous raw material to phosphogypsum in the step (1)<0.5 total CaO in phosphogypsum and calcareous raw materials and SiO in siliceous raw materials 2 The molar ratio of (2) is 1.4-1.8, al in the iron-aluminum correction material 2 O 3 And Fe (Fe) 2 O 3 The sum of (2) is the sum of the mixed raw materials which are burnt and removed SO 3 2-10 wt.% of the rear component, C in the carbonaceous raw material and SO in the mixed raw material 3 Molar ratio of (3)<2.0。
Preferably, the mixed raw material in the step (1) has an average particle diameter of <100 μm.
Preferably, the preheating temperature in the step (2) is more than or equal to 750 ℃.
Preferably, the temperature of the pre-decomposition in the step (2) is 750-1000 ℃.
Preferably, the firing temperature in the step (2) is 1150-1350 ℃ and the firing time is 0.5-2 h.
Preferably, the low-calcium fixed carbon gel material in step (3) has an average particle size of <150 μm.
The invention provides the low-calcium solid carbon gel material prepared by the method.
Preferably, the composition of the low-calcium fixed carbon gelling material comprises, in mass percent: c (C) 3 S 2 >40％，C 5 S 2 $<40％，C 2 AS<15％。
The invention provides a method for preparing a low-calcium solid carbon gel material by using phosphogypsum, which comprises the following steps: (1) Mixing phosphogypsum, a calcareous raw material, a siliceous raw material, an iron-aluminum correction material and a carbonaceous raw material to obtain a mixed raw material; (2) And (3) preheating, pre-decomposing, sintering and grinding the mixed raw material obtained in the step (1) in sequence to obtain the low-calcium solid-carbon gel material. On the one hand, the invention enables the undegraded CaSO to be prepared through reasonable raw material configuration 4 Forming C during firing 5 S 2 Mineral phase having a certain hydration activity and not affecting the carbonization properties of the final solid-carbon gelling material, on the other hand, the raw materials are controlled so that the carbonizable component C in the mineral phase composition of the low-calcium solid-carbon gelling material 3 S 2 And C 2 S is not subjected to CaSO during formation 4 SO from decomposition 3 Thereby greatly reducing the influence on CaSO in phosphogypsum 4 The decomposition temperature is lower, the decomposition energy consumption is reduced, and the production cost is saved; the preparation process flow is simple, the matching degree with the ordinary Portland cement industrial production flow is high, ordinary Portland cement industrial equipment can be used for production only by modifying the decomposing furnace through atmosphere control, the existing equipment and production line are not required to be modified, the production cost is saved, the large-scale resource utilization of solid waste phosphogypsum can be realized, and the consumption of limestone in the production process of the solid carbon gelling material can be obviously reduced because the molar ratio of calcium to silicon is obviously lower than that of ordinary Portland cement, so that the carbon dioxide emission in the production process is greatly reduced, and the preparation process has extremely high environmental value; the prepared low-calcium solid carbon gel material has good mechanical properties after carbonization and maintenance, and has wide application prospect in the structural engineering neighborhood. Examples of the embodimentsThe result shows that the compressive strength of the low-calcium solid carbon gel material provided by the invention is more than or equal to 45MPa after carbonization and maintenance for 2 hours, the flexural strength is more than or equal to 11MPa, the compressive strength is more than or equal to 77MPa after carbonization and maintenance for 24 hours, and the flexural strength is more than or equal to 19MPa.
Detailed Description
The invention provides a method for preparing a low-calcium solid carbon gel material by using phosphogypsum, which comprises the following steps:
(1) Mixing phosphogypsum, a calcareous raw material, a siliceous raw material, an iron-aluminum correction material and a carbonaceous raw material to obtain a mixed raw material;
(2) And (3) preheating, pre-decomposing, sintering and grinding the mixed raw material obtained in the step (1) in sequence to obtain the low-calcium solid-carbon gel material.
The invention mixes phosphogypsum, calcareous raw material, siliceous raw material, iron-aluminum correction material and carbonaceous raw material to obtain mixed raw material.
In the present invention, the phosphogypsum is preferably pretreated before use. In the present invention, the pretreatment preferably includes dehydration and disruption treatments performed sequentially. In the present invention, the temperature of the dehydration is preferably 100 to 105 ℃, more preferably 105 ℃; the loss of weight of the phosphogypsum after dehydration is preferably < 1wt.%. In the present invention, the particle size of the product after the crushing treatment is preferably < 1mm. The invention can remove the bound water in the phosphogypsum by preprocessing the phosphogypsum, and simultaneously reduce the particle size of the phosphogypsum, thereby being beneficial to the subsequent mixing with other raw materials.
In the present invention, the CaO content of the phosphogypsum is preferably>30wt.%; the calcareous raw material preferably comprises one or more of limestone, slaked lime and carbide slag, more preferably limestone or slaked lime; the CaO content in the chemical composition of the calcium raw material after 950 ℃ burning loss is preferable>90wt.%; the siliceous raw materials preferably comprise one or more of sandstone, shale, silica, clay and quartz powder; siO in chemical composition of the silicon-calcium raw material after being burned off at 950 DEG C 2 Is preferably contained in the composition>75wt.% MgO is preferably present<8wt.%; the iron aluminum correction material preferably comprises one or more of iron powder, bauxite and red mud; the saidAl in chemical composition of iron-aluminum correction material after 950 ℃ burning loss 2 O 3 And Fe (Fe) 2 O 3 Preferably the total mass of (2)>50wt.%; the carbonaceous raw material preferably includes one or more of pulverized coal and coke powder. The specific sources of the calcareous raw material, siliceous raw material, iron-aluminum correction material and carbonaceous raw material are not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
In the invention, the mass ratio of the calcareous raw material to phosphogypsum is preferably<0.5; the total CaO in the phosphogypsum and the calcareous raw material and the SiO in the siliceous raw material 2 The molar ratio of (2) is preferably 1.4 to 1.8, more preferably 1.5 to 1.6; al in the iron-aluminum correction material 2 O 3 And Fe (Fe) 2 O 3 Preferably the sum of (2) is the sum of the mixed raw materials which are burned and SO removed 3 2-10 wt.% of the post component; c in the carbonaceous raw material and SO in the mixed raw material 3 Is preferably in a molar ratio of<2.0. The invention can control the dosage relationship of phosphogypsum, calcareous raw material, siliceous raw material, fe-Al correction material and carbonaceous raw material, on one hand, can lead the undissolved CaSO 4 Forming C during firing 5 S 2 Mineral phase having a certain hydration activity and not affecting the carbonization properties of the final solid-carbon gelling material, on the other hand being capable of carbonizing component C in the mineral phase composition of the low-calcium solid-carbon gelling material 3 S 2 And C 2 S is not subjected to CaSO during formation 4 SO from decomposition 3 Thereby greatly reducing the influence on CaSO in phosphogypsum 4 The decomposition rate of the catalyst is required, so that the decomposition temperature is lower, the decomposition energy consumption is reduced, and the production cost is saved.
In the present invention, the mixing means is preferably grinding. In the present invention, the average particle size of the mixed raw material is preferably <100 μm. The specific operation of the grinding is not particularly limited, and the particle size of the mixed raw material can meet the requirement.
After the mixed raw material is obtained, the mixed raw material is sequentially preheated, pre-decomposed, sintered and ground to obtain the low-calcium solid-carbon gel material.
In the present invention, the temperature of the preheating is preferably at least 750 ℃. The mixed raw material is preheated, so that the mixed raw material is favorable for subsequent pre-decomposition treatment.
In the present invention, the temperature of the pre-decomposition is preferably 750 to 1000 ℃, more preferably 800 to 1000 ℃, and even more preferably 850 to 950 ℃; the pre-decomposition is preferably carried out in a reducing atmosphere; o in the pre-decomposed atmosphere 2 Volume fraction is preferably<5vol%; the volume fraction of CO in the pre-decomposed atmosphere is preferably>3vol%, more preferably 4 to 7vol%. In the present invention, SO in the pre-decomposed product 3 Is preferably contained in the composition<12wt.%. The invention can lead a part of CaSO in phosphogypsum to be realized by controlling the temperature and atmosphere of pre-decomposition 4 Decomposition into CaO and SO 3 Thereby improving the quality of clinker, simultaneously reducing the decomposition temperature and reducing the energy consumption.
In the present invention, the pre-decomposition is preferably performed in a decomposing furnace. The specific model of the decomposing furnace is not particularly limited, and commercially available products known to those skilled in the art may be used.
In the present invention, the temperature of the firing is preferably 1150 to 1350 ℃, more preferably 1200 to 1300 ℃, still more preferably 1250 ℃; the time for the firing is preferably 0.5 to 2 hours, more preferably 1 to 1.5 hours. The invention can further lead the CaSO which is not decomposed by controlling the firing parameters 4 Forming C during firing 5 S 2 The mineral phase, thereby further improving the performance of the low-calcium solid-carbon gel material.
In the present invention, the firing is preferably performed in a rotary kiln. The specific model of the rotary kiln is not particularly limited, and commercially available products known to those skilled in the art can be used.
The specific operation of grinding is not particularly limited, and the average particle size of the low-calcium solid-carbon gel material can meet the requirement. In the present invention, the low-calcium fixed carbon gelling material preferably has an average particle size of <150 μm. The invention can further improve the mechanical property of the low-calcium carbon-fixing gel material by controlling the particle size of the low-calcium carbon-fixing gel material.
On the one hand, the invention enables the undegraded CaSO to be prepared through reasonable raw material configuration 4 Forming C during firing 5 S 2 Mineral phase having a certain hydration activity and not affecting the carbonization properties of the final solid-carbon gelling material, on the other hand, the raw materials are controlled so that the carbonizable component C in the mineral phase composition of the low-calcium solid-carbon gelling material 3 S 2 And C 2 S is not subjected to CaSO during formation 4 SO from decomposition 3 Thereby greatly reducing the influence on CaSO in phosphogypsum 4 The decomposition temperature is lower, the decomposition energy consumption is reduced, and the production cost is saved; the preparation process flow is simple, the matching degree with the ordinary Portland cement industrial production flow is high, ordinary Portland cement industrial equipment can be used for production only by modifying the decomposing furnace through atmosphere control, the existing equipment and production line are not required to be modified, the production cost is saved, the large-scale resource utilization of solid waste phosphogypsum can be realized, and the consumption of limestone in the production process of the solid carbon gelling material can be obviously reduced because the molar ratio of calcium to silicon is obviously lower than that of ordinary Portland cement, so that the carbon dioxide emission in the production process is greatly reduced, and the preparation process has extremely high environmental value; the prepared low-calcium solid carbon gel material has good mechanical properties after carbonization and maintenance, and has wide application prospect in the structural engineering neighborhood.
The invention provides the low-calcium solid carbon gel material prepared by the method.
In the present invention, the composition of the low-calcium fixed carbon gelling material preferably includes, in mass percent: c (C) 3 S 2 >40％，C 5 S 2 $<40％，C 2 AS<15%. The invention controls the chemical composition of the low-calcium solid carbon gel material and utilizes the cooperation of different ore phases to ensure that the low-calcium solid carbon gel material has excellent mechanical properties.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A method for preparing a low-calcium solid carbon gel material by using phosphogypsum comprises the following steps:
(1) Pre-treating phosphogypsum to obtain pre-treated phosphogypsum, and then mixing and grinding the pre-treated phosphogypsum with a calcareous raw material, a siliceous raw material, an iron-aluminum correction material and a carbonaceous raw material to obtain a mixed raw material; the pretreatment is dehydration and crushing treatment which are sequentially carried out; the temperature of dehydration is 105 ℃, and the weight loss of phosphogypsum after dehydration is less than 1wt.%; the maximum grain diameter of the crushed product is 0.87mm; the calcareous raw material is limestone, the siliceous raw material is sandstone, the iron-aluminum correction material is bauxite, and the carbonaceous raw material is coal dust; the mass ratio of the phosphogypsum, the calcareous raw material, the siliceous raw material, the iron-aluminum correction material and the carbonaceous raw material after pretreatment is 72:6:19:3:8, 8; the average particle size of the mixed raw material is less than 100 mu m;
(2) Preheating the mixed raw material obtained in the step (1) to 750 ℃ through a 4-stage cyclone, pre-decomposing in a decomposing furnace, sintering in a rotary kiln, and grinding when cooling to below 55 ℃ to obtain a low-calcium solid-carbon gel material; the temperature of the pre-decomposition is 850 ℃; o in the pre-decomposed atmosphere 2 The volume fraction was 4vol%, and the CO volume fraction was controlled to 5vol%; SO in the pre-decomposed product 3 Is 11.7wt.%; the sintering temperature is 1280 ℃, and the sintering time is 0.5h; the average particle size of the low-calcium solid carbon gel material is 147 mu m.
The main chemical composition of the different starting materials in example 1 was analyzed by XRF testing and the results obtained are shown in table 1:
table 1 main chemical composition (wt.%) of different raw materials
The chemical composition of the mixed raw material obtained in step (1) of example 1 is shown in table 2:
table 2 chemical composition (wt.%) of the mixed raw meal obtained in example 1
| LOI | CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | SO 3 | |
| Mixed raw material | 5.801 | 31.392 | 18.301 | 3.795 | 0.900 | 35.372 |
The composition of the low-calcium solid carbon gel material prepared in example 1 was analyzed by XRD full spectrum fitting quantitative analysis, and the obtained results are shown in Table 3, wherein f-CaO was measured according to the method of Cement chemistry analysis (GB/T176-2017):
table 3 composition (wt.%) of the low-calcium fixed carbon gel material prepared in example 1
| C 2 S | C 3 S 2 | C 5 S 2 $ | C 2 AS | Others | f-CaO |
| 8.93 | 40.58 | 32.46 | 9.74 | 8.29 | 0.3 |
Application example 1
The low-calcium solid carbon gel material prepared in example 1 and water are mixed according to a mixing ratio of 0.15, carbonization maintenance is carried out to obtain a sample, and the compressive strength and the flexural strength of the sample are tested, wherein the compressive strength sample is a cylinder with the size of phi 20mm by 20mm, the flexural strength sample is a cuboid with the size of 37.5 by 6.5 by 6.8mm, and the carbonization maintenance atmosphere is testedThe method comprises the following steps: 99% CO 2 The air pressure is 0.3MPa, and the curing temperature is room temperature; the intensity test loading rate was 200N/s, and the test results are shown in Table 4:
TABLE 4 physical Properties of Low-calcium fixed carbon gel Material
Example 2
A method for preparing a low-calcium solid carbon gel material by using phosphogypsum comprises the following steps:
(1) Pre-treating phosphogypsum to obtain pre-treated phosphogypsum, and then mixing and grinding the pre-treated phosphogypsum with a calcareous raw material, a siliceous raw material, an iron-aluminum correction material and a carbonaceous raw material to obtain a mixed raw material; the pretreatment is dehydration and crushing treatment which are sequentially carried out; the temperature of dehydration is 105 ℃, and the weight loss of phosphogypsum after dehydration is less than 1wt.%; the maximum grain diameter of the crushed product is 0.92mm; the calcareous raw material is limestone, the siliceous raw material is sandstone, the iron-aluminum correction material is bauxite, and the carbonaceous raw material is coal dust; the mass ratio of the phosphogypsum, the calcareous raw material, the siliceous raw material, the iron-aluminum correction material and the carbonaceous raw material after pretreatment is 66:7:25:3:7, preparing a base material; the average particle size of the mixed raw material is less than 100 mu m;
(2) Preheating the mixed raw material obtained in the step (1) to 750 ℃ through a 4-stage cyclone, pre-decomposing in a decomposing furnace, sintering in a rotary kiln, and grinding when cooling to below 55 ℃ to obtain a low-calcium solid-carbon gel material; the temperature of the pre-decomposition is 850 ℃; o in the pre-decomposed atmosphere 2 Volume fraction 4vol%, CO volume fraction 4vol%; SO in the pre-decomposed product 3 The content of (2) is 8wt.%; the sintering temperature is 1280 ℃, and the sintering time is 0.5h; average of the low-calcium solid carbon gel materialThe particle size was 147. Mu.m.
The main chemical composition of the different starting materials in example 2 was analyzed by XRF testing and the results obtained are shown in table 5:
table 5 main chemical composition (wt.%) of different raw materials
| LOI | CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | SO 3 | |
| Pretreated phosphogypsum | 3.285 | 37.550 | 4.921 | 0.556 | 0.543 | 48.812 |
| Limestone powder | 41.800 | 50.501 | 2.210 | 0.762 | 0.397 | 0.105 |
| Sandstone | 2.336 | 4.731 | 76.431 | 9.114 | 2.605 | 0.028 |
| Iron-aluminum correction material | 12.500 | 4.200 | 16.700 | 61.000 | 0.172 | 0.089 |
The chemical composition of the mixed raw material obtained in step (1) of example 2 is shown in Table 6:
table 6 chemical composition (wt.%) of the mixed raw meal obtained in example 2
| LOI | CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | SO 3 | |
| Mixed raw material | 5.423 | 26.937 | 20.324 | 4.047 | 0.923 | 29.467 |
The composition of the low-calcium fixed carbon gel material was analyzed, and the obtained results are shown in Table 7, wherein f-CaO was measured according to the method of Cement chemistry analysis (GB/T176-2017):
table 7 composition (wt.%) of the low-calcium fixed carbon gel material prepared in example 2
| C 2 S | C 3 S 2 | C 5 S 2 $ | C 2 AS | Others | f-CaO |
| 22.93 | 45.86 | 15.29 | 7.64 | 10.09 | Not detected |
Application example 2
The low-calcium solid carbon gel material prepared in example 2 and water are mixed according to a mixing ratio of 0.15, carbonization maintenance is performed to obtain a sample, and the compressive strength and the flexural strength of the sample are tested, wherein the compressive strength sample is a cylinder with the size of phi 20mm by 20mm, the flexural strength sample is a cuboid with the size of 37.5 by 6.5 by 6.8mm, and the carbonization maintenance atmosphere is: 99% CO 2 The air pressure is 0.3MPa, and the curing temperature is room temperature; the intensity test loading rate was 200N/s, and the test results are shown in Table 8:
table 8 physical properties of low calcium fixed carbon gel materials
Example 3
A method for preparing a low-calcium solid carbon gel material by using phosphogypsum comprises the following steps:
(1) Pre-treating phosphogypsum to obtain pre-treated phosphogypsum, and then mixing and grinding the pre-treated phosphogypsum with a calcareous raw material, a siliceous raw material, an iron-aluminum correction material and a carbonaceous raw material to obtain a mixed raw material; the pretreatment is dehydration and crushing treatment which are sequentially carried out; the temperature of dehydration is 105 ℃, and the weight loss of phosphogypsum after dehydration is less than 1wt.%; the maximum grain diameter of the crushed product is 0.87mm; the calcareous raw material is limestone, the siliceous raw material is sandstone, the iron-aluminum correction material is bauxite, and the carbonaceous raw material is coal dust; the mass ratio of the phosphogypsum, the calcareous raw material, the siliceous raw material, the iron-aluminum correction material and the carbonaceous raw material after pretreatment is 62.5:4.5:18.7:2.7:10; the average particle size of the mixed raw material is less than 100 mu m;
(2) Preheating the mixed raw material obtained in the step (1) to 750 ℃ through a 4-stage cyclone, pre-decomposing in a decomposing furnace, sintering in a rotary kiln, and grinding when cooling to below 55 ℃ to obtain a low-calcium solid-carbon gel material; the temperature of the pre-decomposition is 850 ℃; o in the pre-decomposed atmosphere 2 Volume fraction 4vol%, CO volume fraction 6vol%; SO in the pre-decomposed product 3 The content of (2) is 10wt.%; the sintering temperature is 1280 ℃, and the sintering time is 0.5h; the average particle size of the low-calcium solid carbon gel material is 147 mu m.
The main chemical composition of the different starting materials in example 3 was analyzed by XRF testing and the results obtained are shown in table 9:
table 9 main chemical composition (wt.%) of different raw materials
| LOI | CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | SO 3 | |
| Pretreated phosphogypsum | 3.285 | 37.550 | 4.921 | 0.556 | 0.543 | 48.812 |
| Limestone powder | 41.800 | 50.501 | 2.210 | 0.762 | 0.397 | 0.105 |
| Sandstone | 2.336 | 4.731 | 76.431 | 9.114 | 2.605 | 0.028 |
| Iron-aluminum correction material | 12.500 | 4.200 | 16.700 | 61.000 | 0.172 | 0.089 |
Example 3 the chemical composition of the mixed raw meal obtained in step (1) is shown in table 10:
table 10 chemical composition (wt.%) of the mixed raw meal obtained in example 3
| LOI | CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | SO 3 | |
| Mixed raw material | 3.060 | 27.098 | 18.146 | 3.748 | 0.864 | 33.934 |
The composition of the low-calcium fixed carbon gel material was analyzed, and the obtained results are shown in Table 11, wherein f-CaO was measured according to the method of Cement chemistry analysis (GB/T176-2017):
table 11 composition (wt.%) of the low-calcium fixed carbon gel material prepared in example 3
| C 2 S | C 3 S 2 | C 5 S 2 $ | C 2 AS | Others | f-CaO |
| 3.00 | 44.96 | 14.99 | 14.99 | 12.40 | Not detected |
Application example 3
The low-calcium solid carbon gel material prepared in example 3 and water are mixed according to a mixing ratio of 0.15, carbonization maintenance is performed to obtain a sample, and the compressive strength and the flexural strength of the sample are tested, wherein the compressive strength sample is a cylinder with the size of phi 20mm by 20mm, the flexural strength sample is a cuboid with the size of 37.5 by 6.5 by 6.8mm, and the carbonization maintenance atmosphere is: 99% CO 2 The air pressure is 0.3MPa, and the curing temperature is room temperature; the intensity test loading rate was 200N/s, and the test results are shown in Table 12:
table 12 physical properties of low calcium fixed carbon gel materials
As can be seen from application examples 1-3, the compressive strength of the sample obtained by the low-calcium solid carbon gel material prepared by the invention is more than or equal to 45MPa after carbonization and maintenance for 2 hours, the compressive strength of the sample after carbonization and maintenance for 24 hours is more than or equal to 77MPa, the flexural strength of the sample after carbonization and maintenance for 2 hours is more than or equal to 11MPa, the flexural strength of the sample after carbonization and maintenance for 24 hours is more than or equal to 19MPa, and the sample has excellent physical properties.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A method for preparing a low-calcium solid carbon gel material by using phosphogypsum comprises the following steps:
(1) Mixing phosphogypsum, a calcareous raw material, a siliceous raw material, an iron-aluminum correction material and a carbonaceous raw material to obtain a mixed raw material;
(2) And (3) preheating, pre-decomposing, sintering and grinding the mixed raw material obtained in the step (1) in sequence to obtain the low-calcium solid-carbon gel material.
2. The method according to claim 1, wherein the calcareous raw material in the step (1) comprises one or more of limestone, slaked lime and carbide slag, the siliceous raw material comprises one or more of sandstone, shale, silica, clay and quartz powder, the iron-aluminum correction material comprises one or more of iron powder, bauxite and red mud, and the carbonaceous raw material comprises one or more of pulverized coal and pulverized coke.
3. The method according to claim 1, wherein the mass ratio of calcareous raw material to phosphogypsum in step (1)<0.5 total CaO in phosphogypsum and calcareous raw materials and SiO in siliceous raw materials 2 The molar ratio of (2) is 1.4-1.8, al in the iron-aluminum correction material 2 O 3 And Fe (Fe) 2 O 3 The sum of (2) is the sum of the mixed raw materials which are burnt and removed SO 3 2 to 10 weight percent of the rear componentC in carbonaceous raw material and SO in mixed raw material 3 Molar ratio of (3)<2.0。
4. The method according to claim 1, characterized in that the average particle size of the mixed raw meal in step (1) is <100 μm.
5. The method according to claim 1, wherein the preheating in step (2) is at a temperature of at least 750 ℃.
6. The method according to claim 1, wherein the temperature of the pre-decomposition in step (2) is 750 to 1000 ℃.
7. The method according to claim 1, wherein the firing temperature in the step (2) is 1150-1350 ℃ and the firing time is 0.5-2 h.
8. The method according to claim 1, wherein the low-calcium solid-carbon gelling material in step (2) has an average particle size <150 μm.
9. The low-calcium solid-carbon gel material prepared by the method of any one of claims 1 to 8.
10. The low-calcium, solid-carbon gelling material according to claim 9, characterized in that the composition of the low-calcium, solid-carbon gelling material comprises, in mass percent: c (C) 3 S 2 >40％，C 5 S 2 $<40％，C 2 AS<15％。
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6113684A (en) * | 1999-04-16 | 2000-09-05 | Kunbargi; Hassan | Rapid hardening, ultra-high early strength Portland-type cement compositions, novel clinkers and methods for their manufacture which reduce harmful gaseous emissions |
| CN106277859A (en) * | 2016-08-01 | 2017-01-04 | 郑州市王楼水泥工业有限公司 | A kind of high hydration activity sulfur calcium silicates mineral and its preparation method and application method |
| WO2017016062A1 (en) * | 2015-07-28 | 2017-02-02 | 盐城工学院 | Low-calcium silicate cement, and preparation method and hardening method thereof |
| CN110078393A (en) * | 2019-05-15 | 2019-08-02 | 盐城工学院 | A kind of method of low temperature preparation sulphur calcium silicates-sulphate aluminium cement |
| CN110194604A (en) * | 2019-05-15 | 2019-09-03 | 盐城工学院 | Tricalcium silicate-sulphur calcium silicates-sulphate aluminium cement and its low temperature preparation method |
| DE102020100254A1 (en) * | 2020-01-08 | 2021-07-08 | Thyssenkrupp Ag | Integrated process for the production of a building material from phosphogypsum |
| WO2021190045A1 (en) * | 2020-03-27 | 2021-09-30 | 河南理工大学 | High-iron and low-calcium silicate cement and preparation method therefor |
| CN115180846A (en) * | 2022-07-13 | 2022-10-14 | 华新水泥股份有限公司 | Process for preparing calcium sulphoaluminate modified portland cement clinker by phosphogypsum desulfurization |
| CN115286266A (en) * | 2022-08-19 | 2022-11-04 | 武汉理工大学 | Negative carbon clinker utilizing phosphogypsum and preparation method thereof |
| CN115677243A (en) * | 2022-12-08 | 2023-02-03 | 中国建筑材料科学研究总院有限公司 | Novel low-carbon cement clinker and preparation method thereof |
-
2023
- 2023-03-20 CN CN202310264754.7A patent/CN116282988A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6113684A (en) * | 1999-04-16 | 2000-09-05 | Kunbargi; Hassan | Rapid hardening, ultra-high early strength Portland-type cement compositions, novel clinkers and methods for their manufacture which reduce harmful gaseous emissions |
| WO2017016062A1 (en) * | 2015-07-28 | 2017-02-02 | 盐城工学院 | Low-calcium silicate cement, and preparation method and hardening method thereof |
| CN106277859A (en) * | 2016-08-01 | 2017-01-04 | 郑州市王楼水泥工业有限公司 | A kind of high hydration activity sulfur calcium silicates mineral and its preparation method and application method |
| CN110078393A (en) * | 2019-05-15 | 2019-08-02 | 盐城工学院 | A kind of method of low temperature preparation sulphur calcium silicates-sulphate aluminium cement |
| CN110194604A (en) * | 2019-05-15 | 2019-09-03 | 盐城工学院 | Tricalcium silicate-sulphur calcium silicates-sulphate aluminium cement and its low temperature preparation method |
| DE102020100254A1 (en) * | 2020-01-08 | 2021-07-08 | Thyssenkrupp Ag | Integrated process for the production of a building material from phosphogypsum |
| WO2021190045A1 (en) * | 2020-03-27 | 2021-09-30 | 河南理工大学 | High-iron and low-calcium silicate cement and preparation method therefor |
| CN115180846A (en) * | 2022-07-13 | 2022-10-14 | 华新水泥股份有限公司 | Process for preparing calcium sulphoaluminate modified portland cement clinker by phosphogypsum desulfurization |
| CN115286266A (en) * | 2022-08-19 | 2022-11-04 | 武汉理工大学 | Negative carbon clinker utilizing phosphogypsum and preparation method thereof |
| CN115677243A (en) * | 2022-12-08 | 2023-02-03 | 中国建筑材料科学研究总院有限公司 | Novel low-carbon cement clinker and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| HAOJIE WANG等: "Green clinker-free binders: Simultaneous immobilization and carbonation of ferrous metallurgical residues activated by sulfur wastes", CONSTRUCTION AND BUILDING MATERIALS, 16 July 2022 (2022-07-16), pages 2 - 10 * |
| 马小玲等: "磷石膏生产硫酸联产水泥研究现状及发展趋势", 新型建筑材料, 25 March 2021 (2021-03-25), pages 71 - 76 * |
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