CN109734416A - A kind of foamed ceramic and its preparation process - Google Patents
A kind of foamed ceramic and its preparation process Download PDFInfo
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- CN109734416A CN109734416A CN201811490114.3A CN201811490114A CN109734416A CN 109734416 A CN109734416 A CN 109734416A CN 201811490114 A CN201811490114 A CN 201811490114A CN 109734416 A CN109734416 A CN 109734416A
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- tailings
- foamed ceramic
- high silicon
- raw material
- shale
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses a kind of foamed ceramic and its preparation process, the raw material weight percentage of the foamed ceramic includes: high silicon tailings 60~70%, makes steel tailings 2~10%, shale 10~17%, kaolin 20%~25%；The present invention makes foamed ceramic as primary raw material by high silicon tailings, it is not only high silicon tailings and makes steel the disposition of tailings and using providing a kind of new approach, increase economic benefit and environmental benefit, moreover, also making foamed ceramic of the invention that there is lightweight, high intensity, the performance of low thermal conductivity.
Description
Technical field
The present invention relates to building material technical fields, more particularly to a kind of foamed ceramic and preparation method thereof.
Background technique
Traditional foamed ceramic thermal insulation material be using pottery mud or kaolin, clay etc. be added foaming agent fire cutting and
At a cost source, the two consumption energy, emission is very not environmentally；But foamed ceramic is low, strong because of its superior noninflammability, water absorption rate
Spending high and building with performances such as service life is always high-end building thermal insulation material.But since thermal coefficient compares current market
On similar product height greatly limit its popularization and application always.
High silicon tailings and steel-making tailings are the major class in mine tailing, oneself warp becomes weight to this kind of industrial solid castoff at present
The source of big pollution sources and safety accident.If the foaming pottery that such mine tailing prepares high added value can be added significantly
Porcelain not only can solve the problem of environmental pollution of mine tailing, and product cost can also be greatly lowered, so that product is with higher
Economic benefit.
Summary of the invention
The purpose of the present invention is increasing the recovery utilization rate of tailing and promoting the capability and performance of foamed ceramic, and provide one kind
Foamed ceramic and its preparation process.
Based on object above, the invention adopts the following technical scheme: a kind of foamed ceramic, the raw material of the foamed ceramic is pressed
Weight includes: high silicon tailings 60~70%, steel-making tailings 2~10%, shale 10~17%, kaolin 20%~25%,
And the sum of each raw material weight content is 100%, auxiliary material is foaming agent 0.2~0.5%, and the high silicon tailings are SiO2Content is greater than
70% mine tailing, the steel-making tailings are the mine tailing that the sum of calcium oxide and content of magnesia are greater than 45%.
In the above raw material proportioning, more preferably raw material weight percentage includes: high silicon tailings 60~70%, page to one kind
Rock 10~17%, kaolin 20%~25%, and the sum of each raw material weight content are 100%, and auxiliary material is foaming agent 0.2~0.5%, institute
Stating high silicon tailings is SiO2Content is greater than 70% mine tailing.
Wherein the high silicon tailings powder is to select one of lithium tailing, iron tailings, quartz sand tailing or any number of mixing.
The present invention also provides the preparation methods of foamed ceramic, weigh raw material according to above-mentioned technical proposal raw material proportioning, including
Following steps:
(1) by high silicon tailings, steel-making tailings, shale, kaolin, or by high silicon tailings, shale, kaolin, foaming agent is added, mixes
Slurry is made in wet ball grinding after conjunction, and the slurry fineness 10000-hole sieve is remaining less than 1.5%；
(2) the dry slurry forms hollow ball powder, and dried material moisture is less than 1.5%；
(3) it by fine powder raw material obtained, is granulated, is granulated 20~80 mesh of partial size；
(4) hollow ball powder obtained will be granulated to be fitted into refractory-material dies, and will strike off rear sintering processes, sintering temperature:
1150 DEG C~1190 DEG C, the sintering period: 14~16h.
In method made above, paving alumina setter layer in the refractory-material dies, the alumina setter thickness
Spend 1~2mm.
According to foamed ceramic made from method made above, the foamed ceramic: 200~400g/cm of bulk density3, resist
1.5~2MPa of Compressive Strength, thermal coefficient 0.06~0.1 (w/ (mk)).
High silicon tailings of the invention are SiO2Content is greater than 70% mine tailing, is a kind of fluxed raw material well, as
The primary raw material of foamed ceramic, add some necessary auxiliary materials, and the raw materials such as kaolin, shale produce foamed ceramic, refines
Steel tailings essential mineral group becomes larnite, black calcium nutrition, wustite, kyanite, lime etc.；In chemical component calcium oxide and
The content of the sum of magnesia is greater than 45%, high temperature viscosity when firing temperature and firing can be improved in firing, by itself and high silicon tail
Mine is used together, and increases the recovery utilization rate of tailing.It is also resided in place of creation of the invention, not only solves the environment of mine tailing
Pollution problem also reduces the manufacturing cost of foamed ceramic, and by selecting the raw material especially matched and technique, especially makes
Slurry fineness 10000-hole sieve is remaining less than 1.5% in standby technique, is granulated 20~80 mesh of partial size, and foamed ceramic obtained has lightweight, height
The excellent performance of intensity, low thermal conductivity greatly improves the performance of foamed ceramic.
Detailed description of the invention
The sample of different slurry fineness is burnt into figure in Fig. 1 preparation process of the present invention；
The different sample drawings for being granulated partial size raw material and firing in Fig. 2 preparation process of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The raw material weight percentage of a kind of foamed ceramic of the invention, the foamed ceramic includes: high silicon tailings
60~70%, making steel tailings 2~10%, shale 10~17%, kaolin 20%~25%, and the sum of each raw material weight content is 100%,
Auxiliary material is foaming agent 0.2~0.5%, and the high silicon tailings are the mine tailing that SiO2 content is greater than 70%, and the steel-making tailings is oxygen
Change the mine tailing that the sum of calcium and content of magnesia are greater than 45%.
In the above raw material proportioning, more preferably raw material weight percentage includes: high silicon tailings 60~70%, page to one kind
Rock 10~17%, kaolin 20%~25%, and the sum of each raw material weight content are 100%, and auxiliary material is foaming agent 0.2~0.5%, institute
Stating high silicon tailings is SiO2Content is greater than 70% mine tailing.
Embodiment 1
The raw material weight percentage of foamed ceramic includes: high silicon tailings 60%, makes steel tailings 3%, shale 17%, kaolin
20%, the sum of each raw material weight content be 100%, auxiliary material be foaming agent 0.4%, table 1 be high silicon tailings and steel-making tailings chemistry at
Point.
1 material chemical component of table
The preparation method of foamed ceramic, comprising the following steps:
(1) by high silicon tailings, steel-making tailings, shale, kaolin, foaming agent is added, slurry is made in wet ball grinding after mixing, described
Slurry fineness 10000-hole sieve is remaining less than 1.5%；
(2) the dry slurry forms hollow ball powder, and dried material moisture is less than 1.5%；
(3) it by fine powder raw material obtained, is granulated, is granulated 20~80 mesh of partial size；
(4) hollow ball powder obtained will be granulated to be fitted into refractory-material dies, and will strike off rear sintering processes, sintering temperature:
1150 DEG C~1190 DEG C, the sintering period: 14~16h.
In method made above, paving alumina setter layer in the refractory-material dies, the alumina setter thickness
Spend 1~2mm.
Embodiment 2
The raw material weight percentage of foamed ceramic includes: high silicon tailings 70%, makes steel tailings 5%, shale 15%, kaolin
10%, the sum of each raw material weight content is 100%, and auxiliary material is foaming agent 0.5%, and high silicon tailings and steel-making tailings chemical component are shown in Table
1, specific preparation process is the same as embodiment 1.
Embodiment 3
The raw material weight percentage of foamed ceramic includes: high silicon tailings 60%, makes steel tailings 15%, shale 10%, kaolin
15%, the sum of each raw material weight content is 100%, and auxiliary material is foaming agent 0.3%, and high silicon tailings and steel-making tailings chemical component are shown in Table
1, specific preparation process is the same as embodiment 1.
Embodiment 4
The raw material weight percentage of foamed ceramic includes: high silicon tailings 65%, shale 15%, kaolin 20%, each raw material weight
Measuring the sum of content is 100%, and auxiliary material is foaming agent 0.4%, and high silicon tailings chemical component is shown in Table 1, the specific same embodiment of preparation process
1。
Embodiment 5
The raw material weight percentage of foamed ceramic includes: high silicon tailings 70%, shale 10%, kaolin 20%, each raw material weight
Measuring the sum of content is 100%, and auxiliary material is foaming agent 0.2%, and high silicon tailings chemical component is shown in Table 1, the specific same embodiment of preparation process
1。
Bulk density of the different embodiments of table 2 in different sintering temperatures
Show that final foamed ceramic body recipe is optimal for embodiment 1 and embodiment 4 according to the data of above-mentioned different embodiments.
Simultaneously in order to optimize above-mentioned preparation process, in order to produce the foamed ceramic product of optimum performance, in formula and its
Under the premise of his condition is identical, influence of the moil fineness to foamed ceramic performance is studied.The condition for influencing foamed ceramic performance has
Two, one must have in green body a certain amount of glass phase to generate at high temperature；Second foams while glass phase generates
Agent must generate the gas of sufficient amount.From table 3 in Fig. 1 as can be seen that in the identical feelings of the additional amount of foaming agent, firing temperature
Under condition, the fineness of mud is smaller, and the firing temperature of product is lower, that is to say, that glass phase shape before foaming agent generates gas
At；When mud particle is thicker, when foaming agent generates gas, generated glass phasor is insufficient in green body, at this moment the hole of green body
Gap is larger, and gas will escape, so that the closed pore amount formed in green body is insufficient, bulk density is larger.
Influence of 3 moil fineness of table to properties of product
Illustrate: slurry fineness 10000-hole sieve is remaining less than No. 1 sample in 1.5% corresponding diagram 1, and slurry fineness 10000-hole sieve is remaining less than 3.0%
No. 2 samples in corresponding diagram 1, slurry fineness 10000-hole sieve is remaining less than No. 3 samples in 5.0% corresponding diagram 1, and optimal foamed ceramic produces
Product, slurry fineness 10000-hole sieve are remaining less than 1.5%.
Simultaneously in order to optimize above-mentioned preparation process, we also grinds properties of product influence
Study carefully.
4 granulation material particle diameter distribution of table influences properties of product
As can be seen that produce qualified foamed ceramic product from table 4 and Fig. 2, granulation material partial size is preferably controlled in 20~
Between 80 mesh.
Illustrate: No. 1 sample in partial size≤80 corresponding diagrams 2, No. 2 samples in 20≤partial size≤80 corresponding diagrams 2,20≤partial size pair
Answer No. 3 samples in Fig. 2.
Embodiment 6
1. prepared by raw material:
With embodiment 1 and the formula of embodiment 4 for test recipe, ingredient 200kg is put into 200kg ball mill and grinds, pellet water ratio
For 1:2:1, the ball milling period 16 hours, fineness control was more than the 10000-hole sieve less than 1.5%.It is ground to blowing after fineness, slurry cartonning
Dry in formula drier, dried material moisture is controlled less than 1.5%；Dried material is made using spray drying tower, compacting
20~80 mesh particulate materials are made in uniformly mixed powder by grain or disk granulation.
2. firing:
The powder prepared is put into 360m tunnel oven and is burnt into, and powder is laid in framed, framed interior paving alumina setter
Paper；Firing temperature: 1180 DEG C, firing period: 18h cools to room temperature, comes out of the stove.Framed flange is shed, foamed ceramic is taken out, cuts
It cuts, polish the foamed ceramic that high-strength light low thermal conductivity can be obtained.
In above embodiments, foaming agent therein is carborundum powder and/or Fluorspar Powder, and wherein high silicon tailings powder is to select lithium tail
One of mine, iron tailings, quartz sand tailing or any number of mixing.
Properties of product test result
| Bulk density (g/cm3) | Compression strength (MPa) | Thermal coefficient (w/ (mk)) |
| 200~400 | 1.5~2 | 0.06~0.1 |
By selecting, slurry fineness 10000-hole sieve is remaining less than 1.5% in the raw material especially matched and technique, especially preparation process, makes
Grain 20~80 mesh of partial size, foamed ceramic obtained have lightweight, high intensity, low thermal conductivity excellent performance, greatly improve
The performance of foamed ceramic.
Claims (6)
1. a kind of foamed ceramic, which is characterized in that the raw material weight percentage of the foamed ceramic includes: high silicon tailings
60~70%, making steel tailings 2~10%, shale 10~17%, kaolin 20%~25%, and the sum of each raw material weight content is 100%,
Auxiliary material is foaming agent 0.2~0.5%, and the high silicon tailings are SiO2Content is greater than 70% mine tailing, and the steel-making tailings is oxygen
Change the mine tailing that the sum of calcium and content of magnesia are greater than 45%.
2. a kind of foamed ceramic according to claim 1, which is characterized in that the raw material of foamed ceramic percentage by weight
Content meter includes: high silicon tailings 60~70%, shale 10~17%, kaolin 20%~25%, and the sum of each raw material weight content is
100%, auxiliary material is foaming agent 0.2~0.5%, and the high silicon tailings are SiO2Content is greater than 70% mine tailing.
3. preparation method according to claim 1, wherein the high silicon tailings powder is to select lithium tailing, iron tailings, quartz sand
One of tailing or any number of mixing.
4. a kind of preparation method of the foamed ceramic as described in any one of claims 1 or 2, which is characterized in that including following
Step:
High silicon tailings, steel-making tailings, shale, kaolin are weighed by claim 1 proportion, or by high silicon tailings, shale, kaolinite
Soil is weighed by claim 2 proportion, and foaming agent is added, the obtained slurry of wet ball grinding after mixing, more than the slurry fineness 10000-hole sieve
Less than 1.5%；
The dry slurry forms hollow ball powder, and dried material moisture is less than 1.5%；By fine powder raw material obtained, carry out
It is granulated, is granulated 20~80 mesh of partial size；
Hollow ball powder obtained will be granulated to be fitted into refractory-material dies, strike off rear sintering processes, sintering temperature: 1150 DEG C
~1190 DEG C, the sintering period: 14~16h.
5. a kind of preparation method of foamed ceramic according to claim 4, which is characterized in that in the refractory-material dies
Paving alumina setter layer, 1~2mm of the alumina setter thickness degree.
6. foamed ceramic made from the preparation method of foamed ceramic according to claim 4, which is characterized in that the foaming
Ceramics: 200~400g/cm of bulk density3, 1.5~2MPa of compression strength, thermal coefficient 0.06~0.1 (w/ (mk)).
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| CN201811490114.3A CN109734416A (en) | 2018-12-06 | 2018-12-06 | A kind of foamed ceramic and its preparation process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110981431A (en) * | 2019-12-31 | 2020-04-10 | 江西中材新材料有限公司 | Foamed ceramic product preparation method and foamed ceramic product |
| CN111153711A (en) * | 2020-01-13 | 2020-05-15 | 山东晟世达科技有限公司 | Foamed ceramic with high fire resistance limit and capable of being rapidly cooled and preparation method thereof |
| CN115572176A (en) * | 2022-09-30 | 2023-01-06 | 广西欧神诺陶瓷有限公司 | Light ceramic tile prepared from metal tailings and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110981431A (en) * | 2019-12-31 | 2020-04-10 | 江西中材新材料有限公司 | Foamed ceramic product preparation method and foamed ceramic product |
| CN111153711A (en) * | 2020-01-13 | 2020-05-15 | 山东晟世达科技有限公司 | Foamed ceramic with high fire resistance limit and capable of being rapidly cooled and preparation method thereof |
| CN115572176A (en) * | 2022-09-30 | 2023-01-06 | 广西欧神诺陶瓷有限公司 | Light ceramic tile prepared from metal tailings and preparation method thereof |
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Application publication date: 20190510 |