CN115321865A - 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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- CN115321865A CN115321865A CN202210732604.XA CN202210732604A CN115321865A CN 115321865 A CN115321865 A CN 115321865A CN 202210732604 A CN202210732604 A CN 202210732604A CN 115321865 A CN115321865 A CN 115321865A
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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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (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, wherein the main raw materials of the core comprise 100 parts by weight of phosphogypsum and 1-3 parts by weight of a binder; the core-shell cement mortar is prepared from 5-10 parts by weight of cement, 20-25 parts by weight of lime and 65-70 parts by weight of siliceous materials through high-temperature high-pressure hydrothermal synthesis. The light aggregate obtained by the invention has low volume density and high mechanical property, and the phosphogypsum is mainly adopted to prepare the light aggregate, so that a new way for recycling the phosphogypsum is provided, the preparation process does not need high-temperature sintering treatment, the carbon emission is reduced, and the development policy of the national building material industry is met.
Description
Technical Field
The invention relates to the technical field of light aggregate, in particular to non-fired artificial phosphogypsum-based light aggregate and a preparation method thereof.
Background
Phosphogypsum is a solid waste produced in the wet-process phosphoric acid process, whose composition is mainly calcium sulphate dihydrate (CaSO 4 £ 2H 2O). The composition of the phosphogypsum is complex, besides calcium sulfate, incompletely decomposed phosphorite, residual phosphoric acid, fluoride, acid insoluble substances, organic matters and the like exist, and the existence of fluorine and the organic matters has the greatest influence on the resource utilization of the phosphogypsum. Every 1 ton of wet-process phosphoric acid is produced to produce 4.5 tons of phosphogypsum slag, the current phosphogypsum stock in China exceeds 7 hundred million tons, and about 8000 million tons of phosphogypsum is newly added every year. The random discharge and accumulation of the phosphogypsum seriously damage the ecological environment, not only pollutes underground water resources, but also causes the waste of land resources, and the future sustainable development of the phosphorization industry faces huge challenges. Therefore, reasonable utilization of the phosphogypsum is not slow.
The preparation of light aggregate by using phosphogypsum has been studied more, but most of the phosphogypsum is used for firing ceramsite. The invention discloses a phosphogypsum shale ceramsite and a preparation method thereof, wherein the phosphogypsum shale ceramsite is prepared by calcining phosphogypsum, bauxite and shale in a muffle furnace, wherein the application number of the Chinese patent invention is CN 201710874652.1. The Chinese patent with the application number of CN201710876536.3 discloses phosphogypsum clay ceramsite and a preparation method thereof, and the phosphogypsum clay ceramsite is obtained by using phosphogypsum, modified clay and bauxite at 1200 ℃. Although the technique utilizes the phosphogypsum to prepare the ceramsite product with excellent performance, the phosphogypsum is reasonably utilized, the calcining energy consumption is high, and a large amount of carbon dioxide gas is generated in the process. Based on the above, the invention utilizes the phosphogypsum to prepare the baking-free light aggregate particles, thereby improving a new idea for the resource utilization of the phosphogypsum.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing a baking-free artificial phosphogypsum-based lightweight aggregate, so as to solve 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 purpose, the technical scheme of the invention is realized as follows:
a preparation method of baking-free artificial phosphogypsum-based lightweight aggregate comprises the following steps:
1) Uniformly mixing 100 parts of phosphogypsum and 1-3 parts of binder in advance according to parts by weight, adding 25-30 parts of water, placing the mixture into a disc granulator to form a ball with the diameter of 3-5mm, and then placing the ball under the 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 materials according to parts by weight, adding 30-35 parts of water, and stirring into viscous slurry;
3) Wrapping the slurry obtained in the step 2) on the surface of the sphere obtained 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 obtained in the step 3) at 185-210 ℃ under the saturated steam pressure of 1.2-1.6MPa for heat preservation for 6-8h, and performing high-temperature and high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based light aggregate.
Optionally, the sieve residue of 200 mesh sieve of the phosphogypsum in step 1), the lime and the siliceous material in step 2) is 8-10%.
Optionally, the binder in step 1) is one or more of methyl cellulose riddle, sodium alginate and xanthan gum.
Optionally, the lime in the step 2) is slaked lime obtained by slaking quicklime, and the slaking time is longer than 4h.
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 purpose of the 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 core mainly comprises 100 parts by weight of phosphogypsum and 1-3 parts by weight of a binder; the core-shell material comprises, by weight, 5-10 parts of cement, 20-25 parts of lime and 65-70 parts of siliceous materials.
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 disclosed by the invention does not need to be subjected to high-temperature sintering treatment, reduces the carbon emission, and accords with the development policy of the national building material industry.
2. The phosphogypsum-based lightweight aggregate particles adopt phosphogypsum as a core structure, and because the gypsum has lighter density, silicon and calcium in a shell structure do not react at normal temperature, and silicon and calcium react to produce high-strength low-alkalinity hydration products of tobermorite and hydrated calcium silicate gel under the autoclaved condition, the lightweight aggregate obtained by the invention has the performance advantages of light density and high strength.
3. The invention utilizes the industrial solid waste phosphogypsum to prepare the light aggregate particles, solves the problem of large phosphogypsum stacking quantity, has low production cost and widens the utilization path of the phosphogypsum.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
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 comprises the following steps:
1) According to the weight parts, 100 parts of phosphogypsum and 1 part of methyl cellulose ether binder are uniformly mixed in advance, 25 parts of water are added, the mixture is placed into a disc granulator to form a ball with the diameter of 3-5mm, and then the ball is maintained for 24 hours under the normal-temperature maintenance condition, wherein the phosphogypsum is obtained by pre-grinding massive phosphogypsum particles, and the screen residue of a 200-mesh sieve is 8 percent;
2) Mixing 5 parts of cement, 25 parts of slaked lime and 70 parts of siliceous material sandstone according to parts by weight, adding 30 parts of water, and stirring into viscous slurry, wherein the content of silicon dioxide in the siliceous material sandstone is more than 65%, the chemical components of the siliceous material sandstone are shown in table 1, and the 200-mesh screen residue of the siliceous material sandstone is 8%; slaking lime is slaked lime obtained by slaking quicklime, the slaking time is more than 4h, and the 200-mesh screen residue is 8%;
3) Coating the slurry obtained in the step 2) on the surface of the round ball obtained 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 obtained in the step 3) in a still kettle with the temperature of 185 ℃ and the saturated steam pressure of 1.2Mpa for heat preservation for 8 hours, cooling to room temperature, and carrying out high-temperature high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based light aggregate.
TABLE 1 sandstone chemical composition
| Composition (I) | 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
A preparation method of baking-free artificial phosphogypsum-based lightweight aggregate comprises the following steps:
1) Uniformly mixing 100 parts of phosphogypsum and 2 parts of sodium alginate serving as a binder in advance, adding 28 parts of water, putting the mixture into a disc granulator to form a ball with the diameter of 3-5mm, and curing the ball for 36 hours under the normal-temperature curing condition, wherein the phosphogypsum is obtained by pre-grinding massive phosphogypsum particles, and the sieve residue of a 200-mesh sieve is 8 percent;
2) Mixing 10 parts of cement, 22 parts of slaked lime and 68 parts of siliceous material shale in parts by weight, adding 33 parts of water, and stirring into viscous slurry, wherein the siliceous material shale contains more than 65% of silicon dioxide and has the chemical components shown in table 2, and the 200-mesh screen residue is 9.5%; the slaked lime is slaked lime obtained by slaking raw lime, the slaking time is more than 4 hours, and the 200-mesh screen residue is 9.5 percent;
3) Wrapping the slurry obtained in the step 2) on the surface of the sphere obtained 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 obtained in the step 3) in a still kettle with 195 ℃ and 1.4MPa of saturated steam pressure for heat preservation for 7 hours, cooling to room temperature, and carrying out high-temperature high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based light aggregate.
TABLE 2 shale chemistry
| Composition (I) | 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
A preparation method of baking-free artificial phosphogypsum-based lightweight aggregate comprises the following steps:
1) Uniformly mixing 100 parts of phosphogypsum and 3 parts of xanthan gum serving as a binder in advance, adding 30 parts of water, putting the mixture into a disc granulator to form a 3-5mm round ball, and maintaining the round ball for 48 hours under the condition of normal-temperature maintenance, wherein the phosphogypsum is obtained by pre-grinding massive phosphogypsum particles, and the screen residue of a 200-mesh sieve is 8 percent;
2) Mixing 10 parts of cement, 25 parts of lime and 65 parts of siliceous material tailing sand according to parts by weight, adding 35 parts of water, and stirring into viscous slurry, wherein the content of silicon dioxide in the siliceous material tailing sand is more than 65%, the chemical components of the siliceous material tailing sand are shown in table 3, and the 200-mesh screen residue of the siliceous material tailing sand is 10%; slaking lime is slaked lime obtained by slaking quicklime, the slaking time is more than 4h, and the 200-mesh screen residue is 10 percent;
3) Wrapping the slurry obtained in the step 2) on the surface of the sphere obtained in the step 1) to prepare core-shell structure particles with the diameter of 5-20 mm;
4) And (4) placing the core-shell structure particles obtained in the step 3) in a still kettle with the saturated steam pressure of 1.6MPa at 210 ℃ for heat preservation for 6 hours, cooling to room temperature, and carrying out high-temperature high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based light aggregate.
TABLE 3 tailing Sand chemical composition
| Composition (I) | SiO 2 | Al 2 O 3 | Fe 2 O 3 | CaO | MgO |
| Wt％ | 74.1 | 9.0 | 4.4 | 1.2 | 0.6 |
The properties of the non-fired artificial phosphogypsum-based lightweight aggregate of examples 1-3 of the invention were subjected to a performance test, and the test results are shown in table 4.
As can be seen from Table 4, the particles of the baking-free lightweight aggregate of the baking-free artificial phosphogypsum-based lightweight aggregate of examples 1-3 of the present invention have excellent properties, which meet the current density requirement of the lightweight aggregate for construction of not more than 1500 kg/m 3 The cylinder pressure strength is not lower than 3.5 MPa. The invention utilizes the phosphogypsum as a core structure to prepare the core-shell light aggregate, and the gypsum density is lower and is about 0.9g/cm 3 The high-temperature high-pressure calcination furnace is coated with a layer of cementing material, can obtain excellent performance under the conditions of high temperature and high pressure, greatly saves the required energy consumption compared with high-temperature calcination, reduces the production cost, and recycles the industrial solid waste phosphogypsum.
TABLE 4
| Examples | Light aggregate particle size/mm | Volume 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 present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A preparation method of baking-free artificial phosphogypsum-based lightweight aggregate is characterized by comprising the following steps:
1) Uniformly mixing 100 parts of phosphogypsum and 1-3 parts of binder in advance according to the parts by weight, adding 25-30 parts of water, putting into a disc granulator to form a 3-5mm sphere, and then curing for 24-48h under the normal temperature curing condition;
2) Mixing 5-10 parts of cement, 20-25 parts of lime and 65-70 parts of siliceous materials according to parts by weight, adding 30-35 parts of water, and stirring into viscous slurry;
3) Wrapping the slurry obtained in the step 2) on the surface of the sphere obtained in the step 1) to prepare core-shell structure particles with the diameter of 5-20 mm;
4) And (4) placing the core-shell structure particles obtained in the step 3) at 185-210 ℃ under the saturated steam pressure of 1.2-1.6MPa for heat preservation for 6-8h, and carrying out high-temperature and high-pressure hydrothermal synthesis to obtain the baking-free artificial phosphogypsum-based light aggregate.
2. The method for preparing the baking-free artificial phosphogypsum-based lightweight aggregate according to claim 1, wherein the sieve residue of 200-mesh sieves of the phosphogypsum in the step 1) and the lime and the siliceous material in the step 2) is 8-10%.
3. The method for preparing the burning-free artificial phosphogypsum-based lightweight aggregate according to claim 1, wherein the binder in the step 1) is one or more of methylcellulose riddle, sodium alginate and xanthan gum.
4. The preparation method of the burning-free artificial phosphogypsum-based light aggregate according to the claim 1, characterized in that the slaked lime obtained by slaking the lime quicklime in the step 2) has a slaking time of more than 4h.
5. The method for preparing the burning-free artificial phosphogypsum-based lightweight aggregate according to claim 1, wherein the siliceous material in the step 2) is one or more of sandstone, shale and tailing sand.
6. The method for preparing the baking-free artificial phosphogypsum-based lightweight aggregate according to the claim 1, wherein the silica content in the siliceous material in the step 2) is more than 65 percent.
7. A baking-free artificial phosphogypsum-based lightweight aggregate, which is characterized in that the baking-free artificial phosphogypsum-based lightweight aggregate is prepared by the preparation method of the baking-free artificial phosphogypsum-based lightweight aggregate of any one of claims 1 to 6; 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 materials of the core comprise 100 parts by weight of phosphogypsum and 1-3 parts by weight of binder; the core-shell cement mortar comprises, by weight, 5-10 parts of core-shell main raw materials, 20-25 parts of lime and 65-70 parts of a siliceous material.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN185650B (en) * | 1992-10-14 | 2001-03-24 | Council Scient Ind Res | |
| 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 |
| 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 |
| CN111410500A (en) * | 2020-04-28 | 2020-07-14 | 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 |
-
2022
- 2022-06-27 CN CN202210732604.XA patent/CN115321865B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN185650B (en) * | 1992-10-14 | 2001-03-24 | Council Scient Ind Res | |
| 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 |
| 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 |
| CN111410500A (en) * | 2020-04-28 | 2020-07-14 | 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 |
Non-Patent Citations (2)
| Title |
|---|
| 陈秋雨;刘宁;: "磷石膏改性生土材料试验研究", 低温建筑技术, no. 02 * |
| 陈立军等: "《混凝土及其制品工艺学》", 31 August 2012, 中国建材工业出版社, pages: 266 - 267 * |
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