CN115432986A - Preparation method of high-strength water-permeable composite material - Google Patents
Preparation method of high-strength water-permeable composite material Download PDFInfo
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- CN115432986A CN115432986A CN202211192480.7A CN202211192480A CN115432986A CN 115432986 A CN115432986 A CN 115432986A CN 202211192480 A CN202211192480 A CN 202211192480A CN 115432986 A CN115432986 A CN 115432986A
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- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 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 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000002425 crystallisation Methods 0.000 claims abstract description 21
- 230000008025 crystallization Effects 0.000 claims abstract description 21
- 239000002253 acid Substances 0.000 claims abstract description 16
- 239000012065 filter cake Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000000706 filtrate Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 19
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 239000004568 cement Substances 0.000 abstract description 36
- 239000000463 material Substances 0.000 abstract description 13
- 239000000835 fiber Substances 0.000 abstract description 6
- 239000000428 dust Substances 0.000 abstract description 2
- 229910021487 silica fume Inorganic materials 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 9
- 230000035699 permeability Effects 0.000 description 9
- 229920001410 Microfiber Polymers 0.000 description 8
- 239000003658 microfiber Substances 0.000 description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 239000004567 concrete Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011575 calcium Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 210000003000 inclusion body Anatomy 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 108010081750 Reticulin Proteins 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000002968 anti-fracture Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002982 water resistant material Substances 0.000 description 1
Images
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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses a preparation method of a high-strength water-permeable composite material, which comprises the following steps: step 1, adding phosphogypsum serving as a raw material into an acid solution after adding a crystallization promoter, and stirring for reaction at a certain temperature; step 2, after the reaction is finished, directly cooling and crystallizing the mixture; step 3, after the crystallization is finished, filtering, directly returning filtrate to the step 1 for recycling, washing and drying filter cakes, wherein the dried filter cakes are the high-strength permeable composite material; the invention can fully utilize the phosphogypsum as the raw material and combine the siliceous dust contained in the raw material to prepare the high-strength permeable composite material which can obviously improve the microstructure and the interface bonding strength of the whisker-cement, and effectively improve the bonding strength of the fiber and the cement-based material.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a preparation method of a high-strength water-permeable composite material.
Background
The cement is taken as the most widely used building material in the world, the main limitation is the brittleness, which is mainly attributed to the poor crack resistance and the low bending strength, and in addition, with the increasing speed of the urbanization, the urban ground surface is gradually covered by water-resistant materials such as buildings and various concretes, the drainage capacity of cities is increasingly poor, and the rainwater on the road surface cannot rapidly leak when many cities encounter rainstorm, so that the urban waterlogging is easily caused.
The phosphogypsum is solid waste residue generated when phosphorite is treated by sulfuric acid in the production of phosphoric acid, the phosphogypsum is a main byproduct in the production of wet-process phosphoric acid, and 4.5 tons of phosphogypsum residue are generated when 1 ton of wet-process phosphoric acid is produced. The most abundant phosphogypsum in Hubei is calcium sulfate dihydrate, and SiO 2 Both components can be used for improving the strength of cement, and most of the phosphogypsum is treated in a stacking mode at present, so that the land is occupied, the water eutrophication is caused, and the resource waste is also caused, therefore, the production of the cement additive with high performance and high added value by using the industrial phosphogypsum is significant.
A great deal of research shows that the adding of the fiber material into the cement material can obviously improve the brittleness problem of the cement material and improve the crack resistance and the toughness of the cement material by preventing the interaction of the growth, the expansion and the fracture of microcracks. In patent CN112010603A, silica fume and calcium sulfate whisker are doped in the concrete, so that the compressive and flexural strength of the concrete is improved, and the whisker and the silica fume in the patent are directly obtained by purchase, thereby undoubtedly increasing the product cost. The silica fume is used as an excellent cementing filling material, can promote the formation of C-S-H gel in cement, and obviously improves the microstructure and the interface bonding strength of whisker-cement; the water permeability function of the concrete in the patent mainly depends on that the cement and the water are mixed into slurry and then can cover the surface of the coarse aggregate to form a rich pore system structure. Because the pore structure that coarse aggregate surface formed is great, can reduce the closely knit degree of concrete to a certain extent to make the compressive strength of high water permeability concrete reduce, urgent need one kind can form even mesostructure after mixing with cement, when not influencing compressive strength, improve its water permeability.
Therefore, a preparation method of the high-strength permeable composite material is needed, the phosphogypsum is fully utilized as a raw material, and the high-strength permeable composite material capable of obviously improving the microstructure and the interface bonding strength of the whisker-cement is prepared by combining the silica fume contained after the raw material is treated, so that the bonding strength of the fiber and the cement-based material is effectively improved.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength permeable composite material aiming at the defects of recycling of production water in the prior art, which can fully utilize phosphogypsum as a raw material and combine silica fume contained after the raw material treatment to prepare the high-strength permeable composite material capable of obviously improving the microstructure and the interface bonding strength of whisker-cement, thereby effectively improving the bonding strength of fiber and cement-based materials.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a high-strength water-permeable composite material comprises the following steps:
step 1, adding phosphogypsum serving as a raw material into an acid solution after adding a crystallization promoter, and stirring for reaction at a certain temperature;
step 2, after the reaction is finished, directly cooling and crystallizing the mixture;
and 3, filtering after crystallization is finished, directly returning filtrate to the step 1 for recycling, washing and drying filter cakes, and obtaining the dried filter cakes which are the high-strength permeable composite material.
Preferably, in the step 1, the crystallization assistant is citric acid or polyacrylic acid, and the mass ratio of the crystallization assistant to the phosphogypsum is 1:50-200.
Preferably, the acid solution in step 1 is a hydrochloric acid solution or a nitric acid solution, wherein the solid-to-liquid ratio of the phosphogypsum to the acid solution is 0.03-0.1, and the mass concentration of the acid solution is 6-8%.
Preferably, the stirring reaction temperature in the step 1 is 80-90 ℃, and the reaction time is 3-4h.
Preferably, porous carbon is also added in step 1.
Preferably, the porous carbon has a specific surface area of 500 to 1000m 2 ·g -1 Pore volume of 4-10cm 3 ·g -1 The dosage is 20-100% of the dosage of the phosphogypsum.
The invention has the beneficial effects that:
1. the invention adopts phosphogypsum as a raw material, and the phosphogypsum generates Ca in acid solution 2+ 、SO 4 2- Under the growth environment of rich silicon, the front interface of crystal growth in the crystallization process can be enriched with silicon and form a silicon inclusion body, and the inclusion body can fully increase the interface bonding strength of the crystal whisker and cement.
2. The invention can combine the pore structure of the porous carbon and the calcium sulfate whisker to prepare the high-strength permeable composite material with a cross-linked reticular structure, and the existence of the reticular fiber can increase the strength, toughness and water permeability of the cement material; specifically, the porous carbon material exists in the whole preparation process, provides a place for calcium sulfate crystallization, enables the obtained calcium sulfate whisker to have a cross-linked network structure, and is added into cement, the structure is favorable for promoting the formation of a micro-skeleton in the cement, and the water permeability is improved; therefore, after the high-strength water-permeable composite material is added into a cement material, on one hand, the strength and toughness of the cement material can be obviously improved, and the effects of strengthening and toughening cement are achieved, and on the other hand, a micro-skeleton is formed in the cement by using the cross-linked reticular whiskers, so that certain water permeability can be maintained.
3. The silica fume contained in the high-strength permeable composite material can spontaneously consume a hydration product Ca (OH) after meeting water 2 The gel reaction is generated to generate C-S-H gel which has strong adhesion, the adhesion between the microfiber calcium sulfate whisker and the cement matrix is obviously improved, the interface bonding strength of the microfiber calcium sulfate whisker and the cement matrix is enhanced, and the toughness and the strength of the cement material are further improved.
4. The invention has simple integral production process, adopts phosphogypsum as a raw material, adopts an acid solution dissolution recrystallization method, adopts organic acid as a crystallization promoter to prepare the calcium sulfate whisker containing the siliceous slag with the length-diameter ratio, and mixes the calcium sulfate whisker with the siliceous slag into a cement material, so that the microfiber calcium sulfate whisker improves the strength and toughness of the cement.
5. The invention realizes the reutilization of waste, effectively relieves the problem of phosphogypsum stockpiling, and simultaneously in the reaction of the step 1, the filter residue-silica fume is not removed but directly participates in the reaction of the subsequent step, so that the additional purchase of the silica fume is not needed, and the use cost of the silica fume is greatly saved.
6. The filtrate in the step 3 of the invention is directly returned to the step 1, so that the consumption of chemical reagents such as acid solution, crystallization aid and the like can be effectively reduced, the cyclic utilization exists, and the process production cost is saved.
7. The invention can fully utilize the phosphogypsum as the raw material and combine the siliceous dust contained in the raw material to prepare the high-strength permeable composite material which can obviously improve the microstructure and the interface bonding strength of the whisker-cement, and effectively improve the bonding strength of the fiber and the cement-based material.
Drawings
FIG. 1 is a process flow diagram of a preparation method of a high-strength water-permeable composite material.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in figure 1, the preparation method of the high-strength water-permeable composite material comprises the following steps:
step 1, adding phosphogypsum serving as a raw material into an acid solution after adding a crystallization promoter, and stirring for reaction at a certain temperature; the reaction involved mainly comprises the following steps:
CaSO 4 ·2H 2 o (granule) + HCl = = Ca 2+ +Cl - +SO 4 2- +2H 2 O
Step 2, after the reaction is finished, directly cooling and crystallizing the mixture; the reaction involved mainly comprises the following steps:
Ca 2+ +SO 4 2- +2H 2 O＝＝CaSO 4 ·2H 2 o (fiber)
And 3, filtering after crystallization is finished, directly returning filtrate to the step 1 for recycling, washing and drying filter cakes, and obtaining the dried filter cakes which are the high-strength permeable composite material.
Preferably, in the step 1, the crystallization aid is citric acid or polyacrylic acid, and the mass ratio of the crystallization aid to the phosphogypsum is 1:50-200.
Preferably, the acid solution in step 1 is a hydrochloric acid solution or a nitric acid solution, wherein the solid-to-liquid ratio of the phosphogypsum to the acid solution is 0.03-0.1, and the mass concentration of the acid solution is 6-8%.
Preferably, the stirring reaction temperature in the step 1 is 80-90 ℃, and the reaction time is 3-4h.
Preferably, porous carbon is also added in step 1.
Preferably, the porous carbon has a specific surface area of 500 to 1000m 2 ·g -1 Pore volume of 4-10cm 3 ·g -1 The dosage is 20-100% of the dosage of the phosphogypsum.
To better illustrate the above embodiments, the following examples are given, the scope of the present invention is not limited to the examples given, and the phosphogypsum used in the examples is produced by Ningxing chemical Co., ltd, and the following composition table is given:
table 1: phosphogypsum components:
example 1
1) Weighing 350g of phosphogypsum and 7g of citric acid, uniformly mixing, adding into a reaction kettle, pouring 8750ml of hydrochloric acid solution with the mass concentration of 6.0% and the specific surface area of 738m according to the solid-to-liquid ratio of 0.04 2 ·g -1 Pore volume of 6.16cm 3 ·g -1 The porous carbon of (2) is 60% of the phosphogypsum, and reacts for 3h at 80 ℃.
2) After the reaction is finished, directly cooling and crystallizing the mixture;
3) And (3) after the crystallization is finished, filtering, directly returning filtrate to the step 1), recycling, washing and drying the filter cake at the drying temperature of 45 ℃, wherein the dried filter cake is the high-strength permeable composite material, and the high-strength permeable composite material-1 is prepared and named as A-1, wherein the length-diameter ratio of the microfiber calcium sulfate dihydrate whisker in the A-1 is 68.7.
Example 2
1) Weighing 350g of phosphogypsum and 7g of citric acid, uniformly mixing, adding into the mixtureAdding 7000ml of hydrochloric acid solution with the mass concentration of 7.0% into a reactor according to the solid-to-liquid ratio of 0.05, and adding 832m of specific surface area 2 ·g -1 Pore volume of 8.2cm 3 ·g -1 The porous carbon of (2) is 70% of the phosphogypsum by mass, and reacts for 3 hours at the temperature of 80 ℃.
2) After the reaction is finished, directly cooling and crystallizing the mixture;
3) And (3) after the crystallization is finished, filtering, directly returning filtrate to the step 1), recycling, washing and drying the filter cake at the drying temperature of 45 ℃, and obtaining the dried filter cake which is the high-strength permeable composite material, wherein the high-strength permeable composite material-2 is prepared and named as A-2, and the length-diameter ratio of the microfiber calcium sulfate dihydrate whisker in the A-2 is 68.1.
Example 3
1) Weighing 350g of phosphogypsum and 3.5g of citric acid, uniformly mixing, adding into a reaction kettle, pouring 5000ml of hydrochloric acid solution with the mass concentration of 7.3% and the specific surface area of 947m according to the solid-to-liquid ratio of 0.07 2 ·g -1 Pore volume 9.5cm 3 ·g -1 The porous carbon of (2) is 80% of the phosphogypsum, and reacts for 4h at 90 ℃.
2) After the reaction is finished, directly cooling and crystallizing the mixture;
3) And after crystallization is finished, filtering, directly returning filtrate to the step 1), repeatedly utilizing, washing and drying the filter cake, wherein the drying temperature is 45 ℃, and obtaining the dried filter cake which is the high-strength permeable composite material, wherein the high-strength permeable composite material-3 is prepared and named as A-3, and the length-diameter ratio of the microfiber calcium sulfate dihydrate whisker in the A-3 is 73.4.
Example 4
The method and the steps are the same as those of the example 1, only the porous carbon is not added, and the property of the microfiber calcium sulfate dihydrate whisker is 65.3.
Example 5
The method and the steps are the same as those of the example 1, no porous carbon is added, one step of filtration is added after the reaction step 1), the silica fume is removed, and the length-diameter ratio of the microfiber calcium sulfate dihydrate whisker is 65.4.
Example 6
The method and the steps are the same as those of the embodiment 1, and the points are differentThe addition mass of the phosphogypsum is 20 percent, and the specific surface area is 521m 2 ·g -1 Pore volume of 4.3cm 3 ·g -1 The property of the microfibrous calcium sulfate dihydrate whisker of (2) was 61.1.
Example 7
The method and the steps are the same as the example 1, but the difference is that the adding mass is 30 percent of phosphogypsum, and the specific surface area is 607m 2 ·g -1 Pore volume of 5.3cm 3 ·g -1 The property of the microfibrous calcium sulfate dihydrate whisker of (4) is 63.3.
Example 8
The method and the steps are the same as the example 1, and the difference is that the adding mass is 50 percent of the phosphogypsum, and the specific surface area is 627m 2 ·g -1 Pore volume of 5.8cm 3 ·g -1 The property of the microfibrous calcium sulfate dihydrate whisker of (2) is 64.7.
Example 9
The method and the steps are the same as those of the example 1, and the difference is that the adding mass is 90 percent of the phosphogypsum, and the specific surface area is 947m 2 ·g -1 Pore volume of 11.2cm 3 ·g -1 The property of the microfibrous calcium sulfate dihydrate whisker of (2) is 63.1.
Example 10
The method and the steps are the same as those of the example 1, and the difference is that the adding mass is 100 percent of the phosphogypsum, and the specific surface area is 947m 2 ·g -1 Pore volume of 13.3cm 3 ·g -1 The property of the microfibrous calcium sulfate dihydrate whisker of (4) was 64.2.
The self-gelling fiber composite materials 1-10 prepared by the scheme are mixed according to the mass ratio of 10% and respectively added into cement P.O 42.5, molding mortar test blocks according to the proportion specified in the national standard cement mortar strength test method (ISO method) and maintaining for 28 days, and the porosity, the compressive strength and the bending strength of the molded mortar test blocks are tested, wherein the performance test results are shown in Table 2:
table 2: results of Performance testing
| Examples | Resistance to compression (MPa) | Anti-fracture (MPa) | Coefficient of permeability (mm/s) |
| Example 1 | 68.8 | 11.7 | 9.7 |
| Example 2 | 69.4 | 11.7 | 10.1 |
| Example 3 | 65.6 | 12.2 | 10.5 |
| Example 4 | 61.5 | 9.8 | 4.5 |
| Example 5 | 55.1 | 7.2 | 4.3 |
| Example 6 | 65.4 | 10.9 | 7.4 |
| Example 7 | 66.6 | 11.2 | 7.9 |
| Example 8 | 65.5 | 11.5 | 8.3 |
| Example 9 | 50.7 | 10.7 | 10.4 |
| Example 10 | 49.6 | 10.4 | 10.6 |
The embodiment can show that when the high-strength permeable composite material contains silica fume, the compression strength and the strength of the cement are improved by about 1.2 times; when the high-strength permeable composite material contains porous carbon, the water permeability of the high-strength permeable composite material can be improved by about 2 times by adding the porous carbon into cement; the finally prepared high-strength permeable composite material is added into cement, so that the compressive strength of the cement can reach 69.4MPa, the breaking strength can reach 11.7MPa, and the permeability coefficient is 10.1mm/s.
The above-described embodiments are merely preferred technical solutions of the present invention, and should not be construed as limiting the present invention, and the embodiments and features in the embodiments in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of this invention.
Claims (6)
1. A preparation method of a high-strength water-permeable composite material is characterized by comprising the following steps: it comprises the following steps:
step 1, adding phosphogypsum serving as a raw material into an acid solution after adding a crystallization promoter, and stirring for reaction at a certain temperature;
step 2, after the reaction is finished, directly cooling and crystallizing the mixture;
and 3, filtering after crystallization is finished, directly returning filtrate to the step 1 for recycling, washing and drying filter cakes, and obtaining the dried filter cakes which are the high-strength permeable composite material.
2. The method for preparing the high-strength water-permeable composite material according to claim 1, wherein: in the step 1, the crystallization aid is citric acid or polyacrylic acid, and the mass ratio of the crystallization aid to the phosphogypsum is 1:50-200.
3. The method for preparing a high-strength water-permeable composite material according to claim 1, wherein: in the step 1, the acid solution is hydrochloric acid solution or nitric acid solution, wherein the solid-to-liquid ratio of the phosphogypsum to the acid solution is 0.03-0.1, and the mass concentration of the acid solution is 6-8%.
4. The method for preparing the high-strength water-permeable composite material according to claim 1, wherein: in the step 1, the stirring reaction temperature is 80-90 ℃, and the reaction time is 3-4h.
5. The method for preparing the high-strength water-permeable composite material according to claim 1, wherein: porous carbon is also added in the step 1.
6. The method for preparing the high-strength water-permeable composite material according to claim 5, wherein: the specific surface area of the porous carbon is 500-1000m 2 ·g -1 Pore volume of 4-10cm 3 ·g -1 The dosage is 20-100% of the dosage of the phosphogypsum.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1127374A (en) * | 1977-11-25 | 1982-07-13 | United States Gypsum Company | Fibrous calcium sulfate |
| CN115043619A (en) * | 2022-06-21 | 2022-09-13 | 宜都兴发化工有限公司 | Preparation method of self-gelling fiber composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1127374A (en) * | 1977-11-25 | 1982-07-13 | United States Gypsum Company | Fibrous calcium sulfate |
| CN115043619A (en) * | 2022-06-21 | 2022-09-13 | 宜都兴发化工有限公司 | Preparation method of self-gelling fiber composite material |
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