CN115321865B - Baking-free artificial phosphogypsum-based lightweight aggregate and preparation method thereof - Google Patents
Baking-free artificial phosphogypsum-based lightweight aggregate and preparation method thereof Download PDFInfo
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- CN115321865B CN115321865B CN202210732604.XA CN202210732604A CN115321865B CN 115321865 B CN115321865 B CN 115321865B CN 202210732604 A CN202210732604 A CN 202210732604A CN 115321865 B CN115321865 B CN 115321865B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a baking-free artificial phosphogypsum-based lightweight aggregate and a preparation method thereof, wherein the baking-free artificial phosphogypsum-based lightweight aggregate consists of a core and a core shell wrapped on the surface of the core, and the main raw material of the core is 100 parts of phosphogypsum and 1-3 parts of binder in parts by weight; the main raw materials of the core-shell are 5-10 parts of cement, 20-25 parts of lime and 65-70 parts of siliceous material by weight, and the core-shell is obtained through high-temperature high-pressure hydrothermal synthesis. The lightweight aggregate obtained by the invention has low volume density and high mechanical property, and the lightweight aggregate is mainly prepared by phosphogypsum, so that a new way is provided for the resource utilization of phosphogypsum, the preparation process does not need high-temperature sintering treatment, the carbon emission is reduced, and the method accords with the national development policy of building material industry.
Description
Technical Field
The invention relates to the technical field of lightweight aggregates, in particular to a baking-free artificial phosphogypsum-based lightweight aggregate and a preparation method thereof.
Background
Phosphogypsum is a solid waste generated in the wet-process phosphoric acid process, and the component of phosphogypsum is mainly calcium sulfate dihydrate (CaSO 4 & lt 2 & gtH 2O). Phosphogypsum has complex composition, and besides calcium sulfate, phosphorus ore which is not completely decomposed, residual phosphoric acid, fluoride, acid insoluble substances, organic matters and the like, wherein the presence of fluorine and organic matters has the greatest influence on the recycling of phosphogypsum. 4.5 tons of phosphogypsum slag is produced per 1 ton of wet phosphoric acid, and the phosphogypsum stock in China is more than 7 hundred million tons at present, and about 8000 ten thousand tons are newly increased each year. The random discharge and accumulation of phosphogypsum seriously damages the ecological environment, not only pollutes underground water resources, but also causes the waste of land resources, and the future sustainable development of the phosphorus chemical industry faces great challenges. Therefore, the phosphogypsum is reasonably utilized, and is not slowly contained.
There have been many studies on the preparation of lightweight aggregates using phosphogypsum, but most of them are sintered with phosphogypsum. The Chinese patent application No. CN201710874652.1 discloses phosphogypsum shale ceramsite and a preparation method thereof, wherein phosphogypsum, bauxite and shale are calcined by a muffle furnace to obtain the phosphogypsum shale ceramsite. The Chinese patent application No. CN201710876536.3 discloses phosphogypsum clay ceramsite and a preparation method thereof, wherein phosphogypsum, modified clay and bauxite are utilized to obtain the phosphogypsum clay ceramsite at 1200 ℃. Although the technology utilizes phosphogypsum to prepare the ceramsite product with excellent performance, so that the phosphogypsum is reasonably utilized, the energy consumption of calcination is high, and a large amount of carbon dioxide gas is generated in the process. Based on the method, the invention utilizes phosphogypsum to prepare the baking-free lightweight aggregate particles, thereby improving a new idea for phosphogypsum resource utilization.
Disclosure of Invention
In view of the above, the invention aims to provide a preparation method of baking-free artificial phosphogypsum-based lightweight aggregate, which solves the problems of high energy consumption and large amount of carbon dioxide gas generated in the preparation process of the existing phosphogypsum lightweight aggregate.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the preparation method of the baking-free artificial phosphogypsum-based lightweight aggregate comprises the following steps:
1) According to the weight portions, 100 portions of phosphogypsum and 1 to 3 portions of binder are mixed uniformly in advance, 25 to 30 portions of water are added, and the mixture is put into a disc granulator to form 3 to 5mm spheres and then is placed into a normal temperature curing condition for curing for 24 hours;
2) Mixing 5-10 parts of cement, 20-25 parts of lime and 65-70 parts of siliceous material according to parts by weight, adding 30-35 parts of water, and stirring to form viscous slurry;
3) Coating the slurry in the step 2) on the surface of the sphere in the step 1) to prepare core-shell structure particles with the diameter of 5-20 mm;
4) And (3) placing the core-shell structure particles in the step (3) at 185-210 ℃ and under the saturated steam pressure of 1.2-1.6MPa, preserving the heat for 6-8 hours, and performing high-temperature high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based lightweight aggregate.
Optionally, the phosphogypsum in step 1), the lime in step 2) and the siliceous material are all 8-10% on a 200 mesh screen.
Optionally, the binder in step 1) is one or more of methyl cellulose riddle, sodium alginate and xanthan gum.
Optionally, slaked lime obtained by slaking the lime quicklime in the step 2) has a slaking time of more than 4 hours.
Optionally, the siliceous material in step 2) is one or more of sandstone, shale, and tailings sand.
Optionally, the silica content of the siliceous material in step 2) is greater than 65%.
The second object of the present invention is to provide a baking-free artificial phosphogypsum-based lightweight aggregate, which is prepared by the preparation method of the baking-free artificial phosphogypsum-based lightweight aggregate; the baking-free artificial phosphogypsum-based lightweight aggregate consists of a core and a core shell wrapped on the surface of the core, wherein the main raw material of the core is 100 parts of phosphogypsum and 1-3 parts of binder in parts by weight; the main raw materials of the core-shell are 5-10 parts of cement, 20-25 parts of lime and 65-70 parts of siliceous material by weight.
Compared with the prior art, the preparation method of the baking-free artificial phosphogypsum-based lightweight aggregate has the following advantages:
1. the phosphogypsum-based lightweight aggregate does not need to be subjected to high-temperature sintering treatment, reduces the carbon emission, and accords with the national building material industry development policy.
2. The phosphogypsum-based lightweight aggregate particles adopt phosphogypsum as a core structure, because the density of the phosphogypsum is light, silicon and calcium in a shell structure do not react at normal temperature, and under an autoclaved condition, the silicon-calcium reaction produces low-alkalinity hydration products tobermorite and hydrated calcium silicate gel with high strength, so that the lightweight aggregate obtained by the invention has the performance advantages of light density and high strength.
3. The invention prepares the lightweight aggregate particles by utilizing industrial solid waste phosphogypsum, solves the problem of large phosphogypsum storage quantity, has low production cost and widens the utilization path of phosphogypsum.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The present invention will be described in detail with reference to examples.
Example 1
The preparation method of the baking-free artificial phosphogypsum-based lightweight aggregate specifically comprises the following steps:
1) According to parts by weight, 100 parts of phosphogypsum and 1 part of methyl cellulose ether binder are mixed uniformly in advance, 25 parts of water is added, the mixture is put into a disc granulator to form 3-5mm spheres, and the spheres are placed under the condition of normal temperature maintenance for 24 hours, wherein the phosphogypsum is obtained by grinding block phosphogypsum particles in advance, and the screen residue of a 200-mesh screen is 8%;
2) Mixing 5 parts of cement, 25 parts of slaked lime and 70 parts of siliceous material sandstone, adding 30 parts of water, and stirring to obtain a sticky slurry, wherein the siliceous material sandstone contains more than 65% of silicon dioxide, the chemical components are shown in table 1, and the 200 mesh screen residue is 8%; slaked lime is slaked by slaking lime, the slaking time is more than 4 hours, and the 200 mesh screen residue is 8%;
3) Coating the slurry in the step 2) on the surface of the sphere in the step 1) to prepare core-shell structure particles with the diameter of 5-20 mm;
4) And (3) placing the core-shell structure particles in the step (3) into an autoclave with saturated steam pressure of 1.2Mpa at 185 ℃ for 8 hours, cooling to room temperature, and performing high-temperature high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based lightweight aggregate.
TABLE 1 sandstone chemical compositions
| Composition of the components | SiO 2 | Al 2 O 3 | Fe 2 O 3 | CaO | MgO |
| Wt％ | 66.5 | 14.1 | 6.5 | 1.25 | 1.13 |
Example 2
The preparation method of the baking-free artificial phosphogypsum-based lightweight aggregate specifically comprises the following steps:
1) According to parts by weight, 100 parts of phosphogypsum and 2 parts of sodium alginate serving as a binder are mixed uniformly in advance, 28 parts of water is added, the mixture is put into a disc granulator to form 3-5mm spheres, and the spheres are cured for 36 hours under normal temperature curing conditions, wherein the phosphogypsum is obtained by grinding block phosphogypsum particles in advance, and the screen residue of a 200-mesh screen is 8%;
2) Mixing 10 parts of cement, 22 parts of slaked lime and 68 parts of siliceous shale, adding 33 parts of water, and stirring to obtain sticky slurry, wherein the content of silicon dioxide in the siliceous shale is more than 65%, the chemical components are shown in table 2, and the 200 mesh screen residue is 9.5%; slaked lime is slaked to obtain slaked lime which is slaked to lime, the slaking time is more than 4 hours, and the 200 mesh screen residue is 9.5 percent;
3) Coating the slurry in the step 2) on the surface of the sphere in the step 1) to prepare core-shell structure particles with the diameter of 5-20 mm;
4) And (3) placing the core-shell structure particles in the step (3) into an autoclave with a saturated steam pressure of 1.4MPa at the temperature of 195 ℃ for 7 hours, cooling to room temperature, and performing high-temperature high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based light aggregate.
TABLE 2 shale chemistry
| Composition of the components | SiO 2 | Al 2 O 3 | Fe 2 O 3 | CaO | MgO |
| Wt％ | 74.1 | 9.0 | 4.4 | 1.2 | 0.6 |
Example 3
The preparation method of the baking-free artificial phosphogypsum-based lightweight aggregate specifically comprises the following steps:
1) According to parts by weight, 100 parts of phosphogypsum and 3 parts of binder xanthan gum are mixed uniformly in advance, 30 parts of water is added, the mixture is put into a disc granulator to form 3-5mm spheres, and the spheres are maintained for 48 hours under normal temperature maintenance conditions, wherein the phosphogypsum is obtained by grinding block phosphogypsum particles in advance, and the screen residue of a 200-mesh screen is 8%;
2) Mixing 10 parts of cement, 25 parts of lime and 65 parts of siliceous material tailing sand, adding 35 parts of water, and stirring to obtain sticky slurry, wherein the siliceous material tailing sand contains more than 65% of silicon dioxide, the chemical components are shown in table 3, and the 200 mesh screen residue is 10%; slaked lime is slaked by slaking lime, the slaking time is more than 4 hours, and the 200 mesh screen residue is 10%;
3) Coating the slurry in the step 2) on the surface of the sphere in the step 1) to prepare core-shell structure particles with the diameter of 5-20 mm;
4) And (3) placing the core-shell structure particles in the step (3) into an autoclave with saturated steam pressure of 1.6MPa at 210 ℃ for 6 hours, cooling to room temperature, and performing high-temperature high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based light aggregate.
TABLE 3 tailing sand chemistry
| Composition of the components | SiO 2 | Al 2 O 3 | Fe 2 O 3 | CaO | MgO |
| Wt％ | 74.1 | 9.0 | 4.4 | 1.2 | 0.6 |
The performance of the baking-free artificial phosphogypsum-based lightweight aggregate of examples 1-3 of the present invention was tested and the test results are shown in Table 4.
As can be seen from Table 4, the baking-free lightweight aggregate particles of the baking-free artificial phosphogypsum-based lightweight aggregates of examples 1 to 3 of the present invention have excellent properties, which meet the current density requirement of not more than 1500 kg/m for the lightweight aggregates for construction 3 The cylinder pressure is not lower than 3.5 MPa. The invention uses phosphogypsum as a core structure to prepare the core-shell lightweight aggregate, and the gypsum density is lower about 0.9g/cm 3 The outer coating is made of a layer of cementing material, so that excellent performance can be obtained under the conditions of high temperature and high pressure, compared with high temperature calcination, the method has the advantages of greatly saving required energy consumption, reducing production cost and recycling industrial solid waste phosphogypsum.
TABLE 4 Table 4
| Examples | Lightweight aggregate particle size/mm | Bulk density/(kg/m) 3 ) | Barrel pressure strength/MPa |
| Example 1 | 5-20 | 1.06 | 6.8 |
| Example 2 | 5-20 | 1.13 | 8.6 |
| Example 3 | 5-20 | 1.28 | 7.3 |
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The preparation method of the baking-free artificial phosphogypsum-based lightweight aggregate is characterized by comprising the following steps of:
1) According to the weight portions, 100 portions of phosphogypsum and 1 to 3 portions of binder are mixed uniformly in advance, 25 to 30 portions of water are added, and the mixture is put into a disc granulator to form 3 to 5 balls mm, and then the mixture is placed into a normal temperature curing condition for curing for 24 hours;
2) Mixing 5-10 parts of cement, 20-25 parts of lime and 65-70 parts of siliceous material according to parts by weight, adding 30-35 parts of water, and stirring to form viscous slurry; the silicon dioxide content in the siliceous material is more than 65%;
3) Coating the slurry in the step 2) on the surface of the sphere in the step 1) to prepare core-shell structure particles with diameters of 5-20 and mm;
4) Placing the core-shell structure particles in the step 3) at 185-210 ℃ and under saturated steam pressure of 1.2-1.6MPa, preserving heat for 6-8h, and performing high-temperature high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based lightweight aggregate;
the phosphogypsum in the step 1), the lime in the step 2) and the 200 mesh sieve of the siliceous material are all 8-10%.
2. The method for preparing the baking-free artificial phosphogypsum-based lightweight aggregate according to claim 1, wherein the binder in the step 1) is one or more of methyl cellulose riddle, sodium alginate and xanthan gum.
3. The method for preparing the baking-free artificial phosphogypsum-based lightweight aggregate according to claim 1, which is characterized in that slaked lime obtained by slaking lime quicklime in the step 2) has a slaking time of more than 4 hours.
4. The method for preparing a baking-free artificial phosphogypsum-based lightweight aggregate in accordance with claim 1, wherein the siliceous material in step 2) is one or more of sandstone, shale and tailing sand.
5. A baking-free artificial phosphogypsum-based lightweight aggregate, characterized in that it is prepared by the method for preparing a baking-free artificial phosphogypsum-based lightweight aggregate according to any one of claims 1 to 4; the baking-free artificial phosphogypsum-based lightweight aggregate consists of a core and a core shell wrapped on the surface of the core, wherein the main raw material of the core is 100 parts of phosphogypsum and 1-3 parts of binder in parts by weight; the main raw materials of the core-shell comprise, by weight, 5-10 parts of cement, 20-25 parts of lime and 65-70 parts of siliceous materials.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020096785A (en) * | 2001-06-20 | 2002-12-31 | 남해화학주식회사 | Artificial aggregate manufactured by using phospho-gypsum |
| CN106810169A (en) * | 2017-02-22 | 2017-06-09 | 深圳市航天新材科技有限公司 | A kind of dregs autoclave aerated concrete building block of tobermorite containing aluminium and production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IN185650B (en) * | 1992-10-14 | 2001-03-24 | Council Scient Ind Res | |
| CN109851307A (en) * | 2019-03-15 | 2019-06-07 | 四川轻化工大学 | A kind of construction material and preparation method thereof of ardealite matrix |
| CN111410500B (en) * | 2020-04-28 | 2022-03-01 | 湖北昌耀新材料股份有限公司 | Phosphogypsum ceramsite ball and spherical and gravel type phosphogypsum ceramsite ball light aggregate water stabilization layer |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020096785A (en) * | 2001-06-20 | 2002-12-31 | 남해화학주식회사 | Artificial aggregate manufactured by using phospho-gypsum |
| CN106810169A (en) * | 2017-02-22 | 2017-06-09 | 深圳市航天新材科技有限公司 | A kind of dregs autoclave aerated concrete building block of tobermorite containing aluminium and production method |
Non-Patent Citations (1)
| Title |
|---|
| 磷石膏改性生土材料试验研究;陈秋雨;刘宁;;低温建筑技术(02);全文 * |
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