CN114409431A - Foamed ceramic based on phosphate tailings and coal gangue and preparation method thereof - Google Patents

Foamed ceramic based on phosphate tailings and coal gangue and preparation method thereof Download PDF

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CN114409431A
CN114409431A CN202210012878.1A CN202210012878A CN114409431A CN 114409431 A CN114409431 A CN 114409431A CN 202210012878 A CN202210012878 A CN 202210012878A CN 114409431 A CN114409431 A CN 114409431A
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coal gangue
foamed ceramic
tailings
phosphate tailings
ceramic based
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胡南燕
符芳慧
叶义成
柯丽华
张光权
王其虎
姚囝
罗斌玉
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Wuhan University of Science and Engineering WUSE
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Abstract

The invention relates to a foamed ceramic based on phosphate tailings and coal gangue and a preparation method thereof. The technical scheme is as follows: taking 60-80 wt% of phosphate tailings and 20-40 wt% of coal gangue as raw materials, mixing, stirring, adding 3-5 wt% of a binding agent and 5-9 wt% of water, stirring, forming by mechanical pressing, and drying to obtain a blank; and heating the blank to 600-650 ℃ at the speed of 5-10 ℃/min, heating to 900-950 ℃ at the speed of 3-4 ℃/min, heating to 1150-1200 ℃ at the speed of 1-2 ℃/min, preserving heat for 30-90 min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue. The invention has the advantages of high resource rate, low cost, simple process, low volume density of the prepared product, high compressive strength, small heat conductivity coefficient and strong acid resistance.

Description

Foamed ceramic based on phosphate tailings and coal gangue and preparation method thereof
Technical Field
The invention belongs to the technical field of phosphorus tailings and coal gangue recycling. In particular to foamed ceramic based on phosphate tailings and coal gangue and a preparation method thereof.
Background
The phosphorus tailings are tailings generated in the process of mineral separation of phosphorite, with continuous development and utilization of phosphorite resources, the stock of the phosphorus tailings is increased year by year, and a large amount of solid waste stockpiling of the phosphorus tailings causes huge environmental hazards and risks. At present, the phosphorus tailings are reused in the following ways: and extracting phosphorus, preparing chemical fertilizer, preparing chemical products, filling a mine goaf and the like, but the reutilization rate of phosphorus tailings still has a larger space for improvement.
Coal gangue with a certain proportion is generated in the coal washing process, the coal gangue is one of mining solid wastes with large discharge amount, occupies a large amount of land, is easy to be weathered and spontaneously combusted after being exposed in the air for a long time, and generates a large amount of CO and CO2And H2S and other toxic gases pollute the air. At present, the reuse mode of coal gangue is as follows: extraction and reutilization of useful elements, power generation, cement manufacture, zeolite production, fertilizer production and the like, but the reutilization rate is still to be improved.
The foamed ceramic is a porous material which is composed of a ceramic-based solid-phase framework and air holes and has 'solid-phase continuity and gas-phase discontinuity'. As a novel green environment-friendly material, foamed ceramics increasingly receive attention of people. The raw materials for preparing the foamed ceramics at present mainly comprise vanadium extraction tailings, gasified slag, papermaking white mud waste, fly ash and the like.
For example, patent technology of "porous ceramic and method for preparing porous ceramic from gasified slag" (CN 110294633B) discloses a porous ceramic and a method for preparing porous ceramic from gasified slag, the method comprising: mixing the gasified slag with a binder, a foaming agent, an auxiliary agent and water glass, molding and calcining. The foaming agent is at least one of sodium bicarbonate, ammonium carbonate and sodium carbonate, and the auxiliary agent is carbon powder or coke. The foaming ceramic prepared by the method needs to be added with a foaming agent and an auxiliary agent, so that the preparation cost is improved, the utilization rate of the coal gasification furnace slag is not maximized, the added foaming agent is a high-temperature decomposition carbonic acid foaming agent, the gas generation rate of the foaming agent is difficult to regulate and control, large pores or communicated pores are easy to form, and the generated pores are different in pore size and uneven in distribution and easily have negative effects on the mechanical properties of the foaming ceramic.
According to the patent technology of 'a porous ceramic and a preparation method thereof' (CN 111548182A), the porous ceramic comprises the following components in parts by weight: 70-85 parts of hard porcelain slag, 12-20 parts of binder, 1-6 parts of foaming agent and 2-5 parts of additive, wherein the additive is high-strength gypsum and emulsified paraffin with the mass ratio of (1-3) to 1. The porous ceramic prepared by the method needs to be added with a plurality of components, the process complexity is increased, the preparation cost is increased, and the quality stability of the prepared porous ceramic is greatly influenced by the additive.
The existing foaming ceramic increases the process complexity and increases the difficulty of air hole regulation due to the addition of foaming agent, fluxing agent, foam stabilizer and other components. Some pore-forming agents can pollute the environment when in use, for example, the organic pore-forming agent discharges gas when being burnt out; the technology for preparing the foamed ceramic by utilizing the synergistic effect of the phosphate tailings and the coal gangue is not reported in a public way.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the preparation method of the foamed ceramic based on the phosphorus tailings and the coal gangue, which has the advantages of high resource rate of the phosphorus tailings and the coal gangue, low cost and simple process.
In order to achieve the purpose, the invention adopts the technical scheme that:
step one, taking 60-80 wt% of phosphate tailings and 20-40 wt% of coal gangue as raw materials, and mixing to obtain a mixture. Wherein:
SiO of the phosphorus tailings2The content is more than 70 wt%;
the coal gangue comprises the following chemical components: al (Al)2O3The content is more than 30wt percent, and the C content is more than 9wt percent;
the raw materials are as follows: CaO + MgO is more than or equal to 2 wt% and less than or equal to 4 wt%, K2O+Na2O＜3wt％，Fe2O3+C＞4wt％。
And secondly, stirring the mixture for 15-20 min, adding a bonding agent accounting for 3-5 wt% of the mixture and water accounting for 5-9 wt% of the mixture, continuously stirring for 15-20 min, performing mechanical pressing, and drying for 24-28 h at 100-110 ℃ to obtain a blank.
And step three, heating the blank to 600-650 ℃ at the speed of 5-10 ℃/min, heating to 900-950 ℃ at the speed of 3-4 ℃/min, heating to 1150-1200 ℃ at the speed of 1-2 ℃/min, preserving heat for 30-90 min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue.
The particle size of the phosphate tailings is less than or equal to 75 mu m.
The grain diameter of the coal gangue is less than or equal to 75 mu m.
The binder is white dextrin or polyvinyl alcohol.
The pressure intensity of the machine pressing molding is 5-20 MPa.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
the invention gives play to the characteristics of two solid wastes of the phosphate tailings and the coal gangue, wherein SiO is contained in the solid wastes2And Al2O3As the main component of the foamed ceramic. SiO 22Not only forms the network structure of the glass phase matrix, but also is the main component of the quartz of the main crystal phase, Al2O3Second to SiO2Is an important component for influencing the firing temperature of the foamed ceramics. CaO, MgO, K2O and Na2O(2wt％≤CaO+MgO≤4wt％，K2O+Na2O is less than 3wt percent) and the alkaline metal oxide plays a role of fluxing, promotes the generation of liquid phase, reduces the viscosity and the surface tension of the liquid phase and further promotes the foaming process.Fe2O3And C (Fe)2O3+ C > 4 wt.%) during the high-temperature sintering, a redox reaction takes place, producing CO and CO2The gas, due to the presence of a large amount of viscous liquid phase, and the effect of the surface tension of the liquid phase, is retained in the melt and is difficult to escape, thereby forming a large number of pores.
The invention utilizes the alkaline metal oxide contained in the phosphate tailings and the coal gangue to play the role of fluxing, and the raw material components contain Fe2O3And C acts as a blowing agent without the addition of a co-solvent and blowing agent.
The method has the advantages of high resource rate of the phosphorus tailings and the coal gangue, low cost and simple process, and the prepared foamed ceramic based on the phosphorus tailings and the coal gangue has the advantages of small heat conductivity coefficient, low volume density, high compressive strength and strong acid resistance.
The reason is that:
the raw materials of the invention are two solid wastes of phosphate tailings and coal gangue, the resource rate is high, and the production cost is low; the invention stirs the raw materials, adds the binding agent and water, stirs, shapes, dries, and then burns by three temperature rising systems, the process is simple.
The invention takes the phosphate tailings and the coal gangue as raw materials to prepare the foamed ceramic, does not need to add a cosolvent and a foaming agent, and the alkaline metal oxide contained in the raw materials plays a role in fluxing, promotes the generation of a liquid phase and reduces the viscosity and the surface tension of the liquid phase. Fe in the raw Material2O3And C can generate oxidation-reduction reaction in the high-temperature sintering process to generate CO and CO2Gas, thereby forming pores in the liquid phase. The preparation cost is reduced, the process is simplified, and the resource rate of the phosphate tailings and the coal gangue is maximized.
The phosphorus tailings and coal gangue adopted by the invention contain Fe2O3And MgO, which can play a role in stabilizing bubbles, promotes the stability of the bubbles under the condition of high-temperature sintering, and forms uniform and tiny air holes, thereby reducing the heat conductivity coefficient and the volume density and improving the compressive strength.
The blank of the foamed ceramic prepared by the invention is sintered at high temperature in the air atmosphere to generate a glass phase taking quartz as a main crystal phase, and the glass phase is not easy to dissolve in an acid environment, so that the acid resistance of the foamed ceramic based on the phosphate tailings and the coal gangue is improved.
The detection shows that the foamed ceramic prepared by the invention based on the phosphate tailings and the coal gangue is as follows: the bulk density is less than 1g/cm3(ii) a The thermal conductivity is less than 0.1W/(m.K); the compressive strength is more than 15 MPa; the acid resistance is more than 98 percent. Can be widely used in the fields of environmental protection, chemical industry, metallurgy, energy, bioengineering and the like.
Therefore, the invention has the characteristics of high resource rate of the phosphorus tailings and the coal gangue, low cost and simple process, and the prepared foamed ceramic based on the phosphorus tailings and the coal gangue has low volume density, high compressive strength, small heat conductivity coefficient, strong acid resistance and wide application range.
Drawings
FIG. 1 is a sectional view of a foamed ceramic prepared according to the present invention and based on phosphate tailings and coal gangue.
Detailed Description
The invention is further described with reference to the following figures and detailed description, without limiting its scope.
A foamed ceramic based on phosphate tailings and coal gangue and a preparation method thereof. The preparation method comprises the following steps:
step one, taking 60-80 wt% of phosphate tailings and 20-40 wt% of coal gangue as raw materials, and mixing to obtain a mixture. Wherein:
SiO of the phosphorus tailings2The content is more than 70 wt%;
the coal gangue comprises the following chemical components: al (Al)2O3The content is more than 30wt percent, and the C content is more than 9wt percent;
the raw materials are as follows: CaO + MgO is more than or equal to 2 wt% and less than or equal to 4 wt%, K2O+Na2O＜3wt％，Fe2O3+C＞4wt％。
And secondly, stirring the mixture for 15-20 min, adding a bonding agent accounting for 3-5 wt% of the mixture and water accounting for 5-9 wt% of the mixture, continuously stirring for 15-20 min, performing mechanical pressing, and drying for 24-28 h at 100-110 ℃ to obtain a blank.
And step three, heating the blank to 600-650 ℃ at the speed of 5-10 ℃/min, heating to 900-950 ℃ at the speed of 3-4 ℃/min, heating to 1150-1200 ℃ at the speed of 1-2 ℃/min, preserving heat for 30-90 min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue.
The binder is white dextrin or polyvinyl alcohol.
The pressure intensity of the machine pressing molding is 5-20 MPa.
In this embodiment:
the particle size of the phosphate tailings is less than or equal to 75 mu m;
the grain diameter of the coal gangue is less than or equal to 75 mu m.
The detailed description is omitted in the embodiments.
Example 1
A foamed ceramic based on phosphate tailings and coal gangue and a preparation method thereof. The preparation method comprises the following steps:
step one, taking 60 wt% of phosphate tailings and 40 wt% of coal gangue as raw materials, and mixing to obtain a mixture. Wherein:
SiO of the phosphorus tailings2The content is 74.42 wt%;
the coal gangue comprises the following chemical components: al (Al)2O3The content is 35.01wt percent, and the content of C is 9.48wt percent;
the raw materials are as follows: CaO + MgO 3.168 wt%, K2O+Na2O2.352 wt%, Fe2O3+ C5.796 wt%.
And step two, stirring the mixture for 16min, adding a binding agent accounting for 5 wt% of the mixture and water accounting for 5 wt% of the mixture, continuously stirring for 18min, performing mechanical compression molding, and drying for 24h at 105 ℃ to obtain a blank.
And step three, heating the blank to 600 ℃ at the speed of 9 ℃/min, heating to 950 ℃ at the speed of 3 ℃/min, heating to 1200 ℃ at the speed of 2 ℃/min, preserving heat for 75min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue.
The binding agent is white dextrin.
The pressure of the machine pressing is 20 MPa.
The foamed ceramic prepared in the embodiment based on the phosphate tailings and the coal gangue is detected as follows: the bulk density is 0.98g/cm3(ii) a The thermal conductivity coefficient is 0.089W/(m.K); the compressive strength is 23.95 MPa; the acid resistance was 99.56%.
Example 2
A foamed ceramic based on phosphate tailings and coal gangue and a preparation method thereof. The preparation method comprises the following steps:
step one, taking 65 wt% of phosphate tailings and 35 wt% of coal gangue as raw materials, and mixing to obtain a mixture. Wherein:
SiO of the phosphorus tailings2The content was 78.36 wt%;
the coal gangue comprises the following chemical components: al (Al)2O3The content is 37.25wt percent, and the content of C is 10.23wt percent;
the raw materials are as follows: CaO + MgO 3.5555 wt%, K2O+Na2O2.6745 wt%, Fe2O3+ C5.9295 wt%.
And step two, stirring the mixture for 17min, adding a binding agent accounting for 3 wt% of the mixture and water accounting for 7 wt% of the mixture, continuously stirring for 17min, performing mechanical pressing, and drying for 28h at 110 ℃ to obtain a blank.
And step three, heating the blank to 630 ℃ at the speed of 8 ℃/min, heating to 900 ℃ at the speed of 4 ℃/min, heating to 1180 ℃ at the speed of 2 ℃/min, preserving heat for 90min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue.
The binding agent is polyvinyl alcohol.
The pressure of the machine pressing is 5 MPa.
The foamed ceramic prepared in the embodiment based on the phosphate tailings and the coal gangue is detected as follows: the bulk density is 0.92g/cm3(ii) a The thermal conductivity is 0.092W/(m.K); the compressive strength is 22.87 MPa; the acid resistance was 99.47%.
Example 3
A foamed ceramic based on phosphate tailings and coal gangue and a preparation method thereof. The preparation method comprises the following steps:
step one, taking 70 wt% of phosphate tailings and 30 wt% of coal gangue as raw materials, and mixing to obtain a mixture. Wherein:
SiO of the phosphorus tailings2The content was 78.33 wt%;
the coal gangue comprises the following chemical components: al (Al)2O3The content is 39.21 wt%, and the C content is 9.74 wt%;
the raw materials are as follows: CaO + MgO 3.699 wt%, K2O+Na2O2.837 wt%, Fe2O3+ C6.067 wt%.
And step two, stirring the mixture for 20min, adding a binding agent accounting for 5 wt% of the mixture and water accounting for 6 wt% of the mixture, continuously stirring for 15min, performing mechanical pressing, and drying for 26h at 106 ℃ to obtain a blank.
And step three, heating the blank to 650 ℃ at the speed of 5 ℃/min, heating to 930 ℃ at the speed of 3 ℃/min, heating to 1190 ℃ at the speed of 1 ℃/min, preserving heat for 45min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue.
The binding agent is white dextrin.
The pressure of the machine pressing is 10 MPa.
The foamed ceramic prepared in the embodiment based on the phosphate tailings and the coal gangue is detected as follows: the bulk density is 0.84g/cm3(ii) a The thermal conductivity is 0.083W/(m.K); the compressive strength is 17.36 MPa; the acid resistance was 98.87%.
Example 4
A foamed ceramic based on phosphate tailings and coal gangue and a preparation method thereof. The preparation method comprises the following steps:
step one, taking 75 wt% of phosphate tailings and 25 wt% of coal gangue as raw materials, and mixing to obtain a mixture. Wherein:
SiO of the phosphorus tailings2The content is 80.02 wt%;
the coal gangue comprises the following chemical components: al (Al)2O3The content is 40.35 wt%, and the C content is 9.57 wt%;
the above-mentionedThe raw materials are as follows: CaO + MgO 3.5675 wt%, K2O+Na2O2.9375 wt%, Fe2O3+ C6.6225 wt%.
And step two, stirring the mixture for 18min, adding a binding agent accounting for 5 wt% of the mixture and water accounting for 9 wt% of the mixture, continuously stirring for 16min, performing mechanical pressing, and drying for 25h at 107 ℃ to obtain a blank.
And step three, heating the blank to 640 ℃ at the speed of 7 ℃/min, heating to 950 ℃ at the speed of 4 ℃/min, heating to 1160 ℃ at the speed of 1 ℃/min, preserving heat for 30min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue.
The binding agent is polyvinyl alcohol.
The pressure intensity of the machine pressing is 15 MPa.
The foamed ceramic prepared in the embodiment based on the phosphate tailings and the coal gangue is detected as follows: the bulk density is 0.70g/cm3(ii) a The thermal conductivity coefficient is 0.078W/(m.K); the compressive strength is 18.42 MPa; the acid resistance was 99.62%.
Example 5
A foamed ceramic based on phosphate tailings and coal gangue and a preparation method thereof. The preparation method comprises the following steps:
step one, taking 80 wt% of phosphate tailings and 20 wt% of coal gangue as raw materials, and mixing to obtain a mixture. Wherein:
SiO of the phosphorus tailings2The content was 81.12 wt%;
the coal gangue comprises the following chemical components: al (Al)2O3The content is 41.28wt percent, and the content of C is 10.36wt percent;
the raw materials are as follows: CaO + MgO 3.322 wt%, K2O+Na2O2.752 wt%, Fe2O3+ C was 4.71 wt%.
And step two, stirring the mixture for 15min, adding a binding agent accounting for 5 wt% of the mixture and water accounting for 6 wt% of the mixture, continuously stirring for 19min, performing mechanical pressing, and drying for 27h at 108 ℃ to obtain a blank.
And step three, heating the blank to 600 ℃ at the speed of 5 ℃/min, heating to 950 ℃ at the speed of 3 ℃/min, heating to 1150 ℃ at the speed of 2 ℃/min, preserving heat for 60min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue.
The binding agent is white dextrin.
The pressure of the machine pressing molding is 8 MPa.
The foamed ceramic prepared in the embodiment based on the phosphate tailings and the coal gangue is detected as follows: the bulk density is 0.62g/cm3(ii) a The thermal conductivity coefficient is 0.067W/(m.K); the compressive strength is 16.37 MPa; the acid resistance was 98.98%.
Compared with the prior art, the specific implementation mode has the following positive effects:
the specific implementation mode gives play to the characteristics of two solid wastes, namely the phosphate tailings and the coal gangue, wherein SiO is contained in the solid wastes2And Al2O3As the main component of the foamed ceramic. SiO 22Not only forms the network structure of the glass phase matrix, but also is the main component of the quartz of the main crystal phase, Al2O3Second to SiO2Is an important component for influencing the firing temperature of the foamed ceramics. CaO, MgO, K2O and Na2O(2wt％≤CaO+MgO≤4wt％，K2O+Na2O is less than 3wt percent) and the alkaline metal oxide plays a role of fluxing, promotes the generation of liquid phase, reduces the viscosity and the surface tension of the liquid phase and further promotes the foaming process. Fe2O3And C (Fe)2O3+ C > 4 wt.%) during the high-temperature sintering, a redox reaction takes place, producing CO and CO2The gas, due to the presence of a large amount of viscous liquid phase, and the effect of the surface tension of the liquid phase, is retained in the melt and is difficult to escape, thereby forming a large number of pores.
The specific embodiment utilizes the alkaline metal oxide contained in the phosphate tailings and the coal gangue to play a role of fluxing, and Fe contained in the raw material components2O3And C acts as a blowing agent without the addition of a co-solvent and blowing agent.
The foamed ceramic prepared by the specific embodiment based on the phosphate tailings and the coal gangue is environment-friendly, low in cost, small in heat conductivity coefficient, low in volume density, high in compressive strength and strong in acid resistance. The reason is that:
the raw materials of the embodiment are two solid wastes of phosphate tailings and coal gangue, so that the resource rate is high, and the production cost is low; the specific embodiment is characterized in that the raw materials are stirred, then the binding agent and water are added, the stirring, the forming and the drying are carried out, and then the raw materials are sintered by three temperature-rising systems, so that the process is simple.
In the specific embodiment, the foamed ceramic based on the phosphate tailings and the coal gangue is prepared by taking the phosphate tailings and the coal gangue as raw materials, a cosolvent and a foaming agent are not required to be added, and the alkaline metal oxide contained in the raw materials plays a role in fluxing, so that the generation of a liquid phase is promoted, and the viscosity and the surface tension of the liquid phase are reduced. Fe in the raw Material2O3And C can generate oxidation-reduction reaction in the high-temperature sintering process to generate CO and CO2Gas, thereby forming pores in the liquid phase. The preparation cost is reduced, the process is simplified, and the resource rate of the phosphate tailings and the coal gangue is maximized.
The phosphorus tailings and coal gangue adopted by the specific embodiment contain Fe2O3And MgO, which can play a role in stabilizing bubbles, and can promote the stability of the bubbles under the high-temperature firing condition, the formed pores are shown in figure 1, and figure 1 is a sectional view of the foamed ceramic prepared in example 5 based on the phosphate tailings and the coal gangue. As can be seen from FIG. 1, the formed pores are uniform and tiny, thereby reducing the thermal conductivity and the volume density and improving the compressive strength.
The blank of the foamed ceramic prepared by the specific embodiment is sintered at high temperature in the air atmosphere to generate a glass phase taking quartz as a main crystal phase, and the glass phase is not easy to dissolve in an acid environment, so that the acid resistance of the foamed ceramic is improved.
The detection of the foamed ceramic prepared by the embodiment based on the phosphate tailings and the coal gangue is as follows: the bulk density is less than 1g/cm3(ii) a The thermal conductivity is less than 0.1W/(m.K); the compressive strength is more than 15 MPa; the acid resistance is more than 98 percent. Can be widely used in the fields of environmental protection, chemical industry, metallurgy, energy, bioengineering and the like.
Therefore, the specific embodiment has the characteristics of high resource utilization rate of the phosphorus tailings and the coal gangue, low cost and simple process, and the prepared foamed ceramic based on the phosphorus tailings and the coal gangue has low volume density, high compressive strength, small heat conductivity coefficient, strong acid resistance and wide application range.

Claims (6)

1. A preparation method of foamed ceramic based on phosphate tailings and coal gangue is characterized by comprising the following steps:
step one, taking 60-80 wt% of phosphate tailings and 20-40 wt% of coal gangue as raw materials, and mixing to obtain a mixture;
SiO of the phosphorus tailings2The content is more than 70 wt%;
the coal gangue comprises the following chemical components: al (Al)2O3The content is more than 30wt percent, and the C content is more than 9wt percent;
the raw materials are as follows: CaO + MgO is more than or equal to 2 wt% and less than or equal to 4 wt%, K2O+Na2O＜3wt％，Fe2O3+C＞4wt％；
Step two, stirring the mixture for 15-20 min, adding a binding agent accounting for 3-5 wt% of the mixture and water accounting for 5-9 wt% of the mixture, continuously stirring for 15-20 min, performing mechanical compression molding, and drying for 24-28 h at 100-110 ℃ to obtain a blank;
and step three, heating the blank to 600-650 ℃ at the speed of 5-10 ℃/min, heating to 900-950 ℃ at the speed of 3-4 ℃/min, heating to 1150-1200 ℃ at the speed of 1-2 ℃/min, preserving heat for 30-90 min, and cooling to room temperature along with the furnace to obtain the foamed ceramic based on the phosphate tailings and the coal gangue.
2. The method for preparing the foamed ceramic based on the phosphate tailings and the coal gangue as claimed in claim 1, wherein the particle size of the phosphate tailings is less than or equal to 75 μm.
3. The method for preparing the foamed ceramic based on the phosphate tailings and the coal gangue as claimed in claim 1, wherein the particle size of the coal gangue is less than or equal to 75 μm.
4. The method for preparing the foamed ceramic based on the phosphate tailings and the coal gangue as claimed in claim 1, wherein the binder is white dextrin or polyvinyl alcohol.
5. The method for preparing the foamed ceramic based on the phosphate tailings and the coal gangue as claimed in claim 1, wherein the pressure of the mechanical pressing is 5-20 MPa.
6. The foamed ceramic based on the phosphorus tailings and the coal gangue is prepared by the preparation method of the foamed ceramic based on the phosphorus tailings and the coal gangue according to any one of claims 1 to 5.
CN202210012878.1A 2022-01-07 2022-01-07 Foamed ceramic based on phosphate tailings and coal gangue and preparation method thereof Pending CN114409431A (en)

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