CN110511052A - A kind of foamed ceramic and preparation method thereof using the production of steel plant's tailings - Google Patents
A kind of foamed ceramic and preparation method thereof using the production of steel plant's tailings Download PDFInfo
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
Abstract
The invention discloses a kind of foamed ceramics produced using steel plant's tailings, are mainly made of raw material from the following weight: 50~60 parts, 15~20 parts of clinker of the red tailing in Luoyuan, 10~20 parts of steel slag, 5~10 parts of quartz sand, 4~10 parts of clay, 0.5~5 part of foaming agent, 0.1~1 part of stabilizer；The sum of each raw material component parts by weight are 100 parts；In the steel slag, CaO+MgO >=65wt%, in the clinker, SiO2+Al2O3>=80wt%.The present invention is compounded by steel slag and clinker, realizes the high added value resource utilization of steel plant's tailings.Correspondingly, the invention also discloses a kind of preparation methods of above-mentioned foamed ceramic using the production of steel plant's tailings.
Description
Technical field
The present invention relates to field of inorganic nonmetallic material more particularly to a kind of foamed ceramics produced using steel plant's tailings
And preparation method thereof.
Background technique
The tailings of steel plant's production, the difference of process is generated according to it, can be divided into grain slag, clinker, steel slag three classes.Specifically
, grain slag refers to blast furnace slag, more by becoming granulation foam with water rapid cooling under high temperature fused state
For producing cement and concrete.Clinker refers in pyrometallurgical processes that the slag charge of smelting furnace surface flotation can make cement, clinker
The raw material of brick, clinker glass etc..Steel slag refers in process for making, is passed through oxygen except the tailings generated after carbon.Due to these three
Slag charge generates technique difference, and chemical component, physicochemical property have biggish difference, and application also has biggish difference
It is different.
In terms of the existing research using steel plant's tailings production foamed ceramic is concentrated mainly on clinker because its ingredient with
Other foamed ceramics are close.It foams as Chinese patent CN108840710A discloses a kind of produce using lithium tailing and steel slag tailing
The method of ceramic building thermal insulation material uses 50~60 parts of lithium tailing, 12~30 parts of steel slag tailing, raw clay 20~30
Part, foamed material A2~4 part, 40~50 parts of water be raw material, be prepared thermal coefficient be 0.05~0.062W/mK hair
Bubble ceramics, but its compression strength is only 0.55~1.0MPa.
And for grain slag, steel slag, due to containing a large amount of CaO, MgO in its ingredient, so that it is easy at low temperature
Melting, and the melt viscosity for melting formation is very low, is unfavorable for foaming.
Summary of the invention
Technical problem to be solved by the present invention lies in, a kind of foamed ceramic produced using steel plant's tailings is provided,
Thermal coefficient is low, compression strength is high, and waste residue utilization is high-efficient, energy conservation and environmental protection.
The present invention also technical problems to be solved are, provide a kind of above-mentioned foamed ceramic produced using steel plant's tailings
Preparation method.
In order to solve the above-mentioned technical problems, the present invention provides it is a kind of using steel plant's tailings produce foamed ceramic,
Mainly be made of raw material from the following weight:
50~60 parts of the red tailing in Luoyuan, 15~20 parts of clinker, 10~20 parts of steel slag, 5~10 parts of quartz sand, clay 4~10
Part, 0.5~5 part of foaming agent, 0.1~1 part of stabilizer；
The sum of each raw material component parts by weight are 100 parts；
In the steel slag, CaO+Fe2O3>=65wt%, in the clinker, SiO2+Al2O3>=80wt%.
As an improvement of the above technical solution, the steel slag mainly consists of the following components in percentage by weight: SiO2 15
~18%, Al2O34~6.5%, Fe2O338~44%, TiO20.1~0.4%, CaO 27~35%, MgO 3~4%,
K2O 0.01~0.5%, Na2O 0.01~0.5%.
As an improvement of the above technical solution, the clinker mainly consists of the following components in percentage by weight: SiO2 65
~72%, Al2O315~20%, Fe2O32~3%, TiO20.1~0.5%, CaO 2~3%, MgO 0.5~1.5%,
K2O 4~6%, Na2O 3~5%, LOI 1~1.5%.
As an improvement of the above technical solution, the clay selects one kind or more of Luoyuan sand hill soil, mud washing or black mud
Kind.
As an improvement of the above technical solution, the Luoyuan sand hill soil mainly consists of the following components in percentage by weight:
SiO270~75%, Al2O312~16%, Fe2O30.5~1.5%, CaO 0.3~0.5%, MgO 0.01~0.1%,
K2O 4~6%, Na2O 3~5%, LOI 1~5%；
The mud washing mainly consists of the following components in percentage by weight: SiO245~50%, Al2O332~36%,
Fe2O32~3%, CaO 0.01~0.1%, MgO 0.3~0.5%, K2O 2~3%, Na2O 0.3~0.8%, LOI 8~
12%；
The black mud mainly consists of the following components in percentage by weight: SiO261~65%, Al2O320~24%,
Fe2O31.5~3%, CaO 0.3~1%, MgO 0.3~0.5%, K2O 1~2%, Na2O 0.2~0.6%, LOI 5~
10%；
As an improvement of the above technical solution, the foaming agent is selected in silicon carbide, carbon dust or ceramic abrading block reclaimed materials
It is one or more；The stabilizer selects manganese dioxide.
As an improvement of the above technical solution, compression strength >=7MPa of the low thermally conductive foamed ceramic, thermal coefficient≤
0.1W/mK, bulk density are 170~250kg/m3, water absorption rate≤0.5%, IRa≤ 1.0, Ir≤1.0。
Correspondingly, the invention also discloses a kind of preparation sides of above-mentioned foamed ceramic using the production of steel plant's tailings
Method comprising:
(1) various raw materials are uniformly mixed according to formula, obtain mixture；
(2) mixture is subjected to ball milling, obtains slurry；
(3) slurry is subjected to mist projection granulating, obtains powder；
(4) the powder cloth is expected among high temperature sagger；
(5) high temperature sagger is placed in kiln, according to default sintering curve be burnt into, obtain low thermally conductive foamed ceramic at
Product.
As an improvement of the above technical solution, the sintering curve are as follows:
From room temperature to 1000 DEG C, using the heating rate of 600~800 DEG C/h；
From 1000 DEG C to firing temperature, using the heating rate of 400~550 DEG C/h；
1~1.5h is kept the temperature in firing temperature；
From firing temperature to 600 DEG C, using the rate of temperature fall of 500~800 DEG C/h；
From 600 DEG C to room temperature, using the rate of temperature fall of 300~500 DEG C/h；
The firing temperature is 1140~1160 DEG C, and firing period is 5~8h.
The invention has the following beneficial effects:
1. steel slag and clinker are used in compounding by the present invention, and are added to quartz sand in formula, so that high-temperature fusant is thickened,
Ensure to obtain the foamed ceramic of low thermal conductivity.
2. the present invention is used in compounding by steel slag and clinker, the utilization rate of steel plant's tailings is significantly improved, is realized
The high added value resource utilizations of steel plant's tailings.
3. the present invention by the control to sintering curve, ensured foamed ceramics have relatively low thermal coefficient (≤
0.1W/mK) and relatively high compression strength (>=7MPa).
Detailed description of the invention
Fig. 1 is a kind of preparation method flow chart of low thermally conductive foamed ceramic of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.Only this is stated, the present invention occurs in the text or will occur up, down, left, right, before and after, it is inside and outside etc. just
Position word is not to specific restriction of the invention only on the basis of attached drawing of the invention.
The present invention provides a kind of foamed ceramics produced using steel plant's tailings, mainly by the raw material of following parts by weight
It is made:
50~60 parts of the red tailing in Luoyuan, 15~20 parts of clinker, 10~20 parts of steel slag, 5~10 parts of quartz sand, clay 4~10
Part, 0.5~5 part of foaming agent, 0.1~1 part of stabilizer；The sum of each raw material component parts by weight are 100 parts.
Wherein, after the steel slag is melting, during process for making, it is passed through the tailings that oxygen generates in the process except carbon,
In its ingredient, contain more Ca and Fe；Specifically, in the steel slag, CaO+Fe2O3>=65wt%.Preferably, the steel
Slag mainly consists of the following components in percentage by weight: SiO215~18%, Al2O34~6.5%, Fe2O338~44%,
TiO20.1~0.4%, CaO 27~35%, MgO 3~4%, K2O 0.01~0.5%, Na2O 0.01~0.5%.
Wherein, the clinker is to swim in the slag charge of molten surface in refining process.In its ingredient, contain more Si
And Al, specifically, in the clinker, SiO2+Al2O3>=80wt%.Preferably, the clinker will be by following weight percent
Group be grouped as: SiO265~72%, Al2O315~20%, Fe2O32~3%, TiO20.1~0.5%, CaO 2~
3%, MgO 0.5~1.5%, K2O 4~6%, Na2O 3~5%, LOI 1~1.5%.In clinker containing higher ingredient Si,
Al mainly mutually exists with primary mullite mine, in sintering process, can effectively be thickened high-temperature fusion melt, it is ensured that foaming
The smooth development of technique.Meanwhile by the compounding of clinker and steel slag, the resource utilization of steel plant's tailings is realized.
Wherein, the red tailing in Luoyuan is remaining leftover pieces and some sawdusts etc. in the red process in Luoyuan, main
It consists of the following components in percentage by weight: SiO268~73%, Al2O312~15%, Fe2O31.2~2%, CaO 0.5
~1.5%, MgO 0.2~0.5%, K2O 4~5.5%, Na2O 3~5%, LOI 0.5~3%.Luoyuan in the present invention is red
Al in tailing2O3Accounting is 12~15wt%, Al2O3It is mainly derived from feldspar and mica；Mica meeting among high temperature firing process
It is gradually converted into mullite, provides intensity for foamed ceramic；Spectra can promote the crystallization of mullite to convert, and be promoted strong
Degree.Further, since the red tailing storage in Luoyuan is abundant, chemical composition stability improves the red tailing in Luoyuan in low thermally conductive foamed ceramic
In addition content；The red tailing in Luoyuan is not necessarily to pass through the accumulation homogenizing of plenty of time, certain journey as traditional ceramics manufacturer simultaneously
Production efficiency is improved on degree.
The present invention is added to 10~20 parts of steel slag among formula, although can reduce foamed ceramic firing temperature；
But due to its CaO, Fe2O3Content is high, and CaO can melt between 950~1000 DEG C, and its melt viscosity is very low, is easy so that hair
The gas that infusion generates is escaped across melt, increases thermal coefficient.Therefore, the present invention by the following means compound solves this
Problem: firstly, by compounding steel slag with clinker, mullite content is promoted, is thickened high-temperature fusant；Secondly, adding among formula
5~10 parts of quartz sand is added, can also play the role of being thickened melt, while can also promote the compression strength of foamed ceramic.
Finally, the present invention also introduces 4~10 parts of clays among formula, melt viscosity can effectively reduce, and promote foamed ceramic
Compression strength.Preferably, the addition parts by weight of clay are 5~10 parts.
Specifically, the clay selects one of Luoyuan sand hill soil, mud washing or black mud or a variety of.
Wherein, sand hill soil in Luoyuan refers to the sandy soil on the red mine surface layer in Luoyuan, mainly by following components in percentage by weight group
At: SiO270~75%, Al2O312~16%, Fe2O30.5~1.5%, CaO 0.3~0.5%, MgO 0.01~
0.1%, K2O 4~6%, Na2O 3~5%, LOI 1~5%；SiO containing higher amount in the sand hill soil of Luoyuan2, a part
SiO2With quartz crystal preservation, it can effectively be thickened high-temperature fusant；Some SiO2The preservation in the form of clay mineral, in high temperature
Under also can decompose and form primary mullite crystal, be thickened high-temperature fusant.
Wherein, mud washing is the useless mud that sand hill soil in Luoyuan is washed.The mud washing by following weight percent group
It is grouped as: SiO245~50%, Al2O332~36%, Fe2O32~3%, CaO 0.01~0.1%, MgO 0.3~
0.5%, K2O 2~3%, Na2O 0.3~0.8%, LOI 8~12%；Alumina content is up to 32~36% in mud washing,
The mainly preservation in the form of clay mineral can be decomposed to form primary mullite at high temperature, be thickened high-temperature fusant, and promote hair
Steep the compression strength of ceramics.In addition, alkaline-earth metal, alkali metal content are lower in mud washing, it is viscous that melt will not be further decreased
Degree.
Wherein, the black mud mainly consists of the following components in percentage by weight: SiO261~65%, Al2O320~
24%, Fe2O31.5~3%, CaO 0.3~1%, MgO 0.3~0.5%, K2O 1~2%, Na2O 0.2~0.6%, LOI
5~10%.
Preferably, in the present invention, the clay selects Luoyuan sand hill soil and/or mud washing.It is the red tailing in Luoyuan,
The comprehensive utilization ratio of the red tailing in Luoyuan can effectively be promoted.
In order to reduce the thermal coefficient of foamed ceramic in the present invention, also contain foaming agent 0.5~5 in formula of the invention
Part；The foaming agent selects one of silicon carbide, carbon dust or ceramic abrading block reclaimed materials (main component is silicon carbide and resin)
Or it is a variety of；Preferably, silicon carbide is selected.Foaming agent can decompose generation gas among high temperature firing process, with steel mill's grain slag phase
Cooperation, is greatly lowered the thermal coefficient of foamed ceramic.Preferably, the addition parts by weight of foaming agent are 0.5~3 part.
In addition, reducing thermal coefficient and bulk density to optimize foaming effect, it is also necessary to be added among formula a small amount of
Stabilizer.Specifically, in the present invention, the additive amount of stabilizer is 0.1~1 part, and stabilizer selects manganese dioxide.Titanium dioxide
Manganese can decompose release oxygen at 900 DEG C or so, promote the decomposition of foaming agent.Preferably, the addition parts by weight of stabilizer be 0.5~
1 part.
In order to promote every property of low thermally conductive foamed ceramic in the present invention, it is also necessary to cooperate specific preparation method, have
Body, with reference to Fig. 1, the preparation method of the low thermally conductive foamed ceramic in the present invention the following steps are included:
S1: various raw materials are uniformly mixed according to formula, obtain mixture；
S2: the mixture is subjected to ball milling, obtains slurry；
Wherein, the fineness of the slurry is that 250 meshes tail over < 0.5%.
S3: the slurry is subjected to mist projection granulating, obtains powder；
Specifically, being pumped to spray tower spray drying by slurry in stock tank after aging 24~48h, being granulated；Granulation obtains
Powder in more than 40 mesh particle accounting >=20wt%, the powder of this grain composition has preferable mobility, after being conducive to
Continuous distributing technique.
S4: the powder cloth is expected among high temperature sagger；
S5: being placed in kiln for the high temperature sagger, is burnt into according to default sintering curve, obtains the low thermally conductive hair of high resistance to fire intensity
Steep ceramic product
Wherein, the sintering curve are as follows:
From room temperature to 1000 DEG C, using the heating rate of 600~800 DEG C/h；From 1000 DEG C to firing temperature, using 400
The heating rate of~550 DEG C/h；1~1.5h is kept the temperature in firing temperature；From firing temperature to 600 DEG C, using 500~800 DEG C/h
Rate of temperature fall；From 600 DEG C to room temperature, using the rate of temperature fall of 300~500 DEG C/h；The firing temperature is 1140~1160
DEG C, firing period is 6~10h.
The present invention, hereinafter, using faster heating rate, so that air pressure release is fast in high-temperature liquid-phase, forms bubble at 1000 DEG C
Cuclear density is big, and aperture reduces, and open porosity (water absorption rate) reduces, and the void count on hole wall is reduced, and significantly promotes hair
Steep the compression strength of ceramics.According to experiment, when using the heating rate of 200 DEG C/h, the compression strength of foamed ceramic only 0.9~
1.18MPa, and will heat up rate and be promoted to 600 DEG C/h, that is, it may make compression strength to improve to 7~10MPa.When heating rate is big
Organic matter in 800 DEG C/h, mineral can not decompose in time, will cause various defects.Preferably, at 1000 DEG C hereinafter, using
The heating rate of 600~700 DEG C/h.
After 1000 DEG C of temperature >, heating rate is suitably reduced, foaming agent (SiC) and MnO can be effectively facilitated2Sufficiently point
Solution, reduces the thermal coefficient of foamed ceramic.Preferably, from 1000 DEG C to firing temperature, using 400~500 DEG C of heating rate.
Further, 1~1.5h is kept the temperature in firing temperature, soaking time is appropriately extended, can promote abundant point of clay pit phase in green body
Solution is precipitated mullite crystal, promotes the compression strength of foamed ceramic.
In temperature-fall period, from firing temperature to 600 DEG C, using the rate of temperature fall of 500~800 DEG C/h, this rate of temperature fall can
Ensure that the crystal in high-temperature fusant is sufficiently precipitated, strengthens foamed ceramic.From 600 DEG C to room temperature, using 300~500 DEG C of cooling
Rate.
Preferably, the firing temperature is 1140~1160 DEG C, and firing period is 5~8h.
Under the synergistic effect of above-mentioned formula and preparation method, the foamed ceramic that the present invention obtains, compression strength >=
7MPa, thermal coefficient≤0.1W/mK, bulk density are 170~250kg/m3, water absorption rate≤0.5%, IRa≤ 1.0, Ir≤
1.0。
With specific embodiment, invention is further explained below:
Embodiment 1
The present embodiment provides a kind of foamed ceramic produced using steel plant's tailings, formulas are as follows:
50 parts of the red tailing in Luoyuan, 18 parts of clinker, 15 parts of steel slag, 8 parts of quartz sand, 6 parts of clay, 2.9 parts of foaming agent, stabilizer
0.1 part；
Wherein, clay selects black mud, foaming agent Ceramics abrading block reclaimed materials, and stabilizer selects MnO2；
Wherein, steel slag is composed of the following components: SiO217.1%, Al2O36.3%, Fe2O338.5%, TiO2
0.4%, CaO 34.2%, MgO 3.2%, K2O 0.05%, Na2O 0.25%；
Clinker is composed of the following components: SiO267.1%, Al2O316.9%, Fe2O32.3%, TiO20.4%, CaO
2.3%, MgO 0.9%, K2O 5.3%, Na2O 3.7%, LOI 1.1%；
Preparation method are as follows:
(1) various raw materials are uniformly mixed according to formula, obtain mixture；·
(2) mixture is subjected to ball milling, obtains slurry；
Wherein, it is 0.5% that the fineness of the slurry, which is that 250 meshes tail over,.
(3) slurry is subjected to mist projection granulating, obtains powder；
(4) the powder cloth is expected among high temperature sagger；
(5) high temperature sagger is placed in kiln kiln roasting, obtains low thermally conductive foamed ceramic finished product.
Wherein, when being burnt into using roller kilns, firing temperature is 1140 DEG C, firing period 8h.
Embodiment 2
The present embodiment provides a kind of foamed ceramic produced using steel plant's tailings, formulas are as follows:
54 parts of the red tailing in Luoyuan, 16 parts of clinker, 14 parts of steel slag, 6 parts of quartz sand, 8 parts of clay, 1.8 parts of foaming agent, stabilizer
0.2 part；
Wherein, clay selects mud washing, and foaming agent selects silicon carbide, and stabilizer selects MnO2。
Wherein, steel slag is composed of the following components: SiO217.1%, Al2O36.3%, Fe2O338.5%, TiO2
0.4%, CaO 34.2%, MgO 3.2%, K2O 0.05%, Na2O 0.25%；
Clinker is composed of the following components: SiO267.1%, Al2O316.9%, Fe2O32.3%, TiO20.4%, CaO
2.3%, MgO 0.9%, K2O 5.3%, Na2O 3.7%, LOI 1.1%；
Preparation method are as follows:
(1) various raw materials are uniformly mixed according to formula, obtain mixture；
(2) mixture is subjected to ball milling, obtains slurry；
Wherein, it is 0.5% that the fineness of the slurry, which is that 250 meshes tail over,.
(3) slurry is subjected to mist projection granulating, obtains powder；
(4) the powder cloth is expected among high temperature sagger；
(5) high temperature sagger is placed in kiln kiln roasting, obtains low thermally conductive foamed ceramic finished product.
Wherein, when being burnt into using roller kilns, firing temperature is 1145 DEG C, firing period 6h.
Embodiment 3
The present embodiment provides a kind of foamed ceramic produced using steel plant's tailings, formulas are as follows:
58 parts of the red tailing in Luoyuan, 17 parts of clinker, 12 parts of steel slag, 5 parts of quartz sand, 6 parts of mud washing, 1.6 parts of silicon carbide, MnO2
0.4 part；
Wherein, steel slag is composed of the following components: SiO216.6%, Al2O35.9%, Fe2O341.1%, TiO2
0.4%, CaO 31.9%, MgO 3.7%, K2O 0.1%, Na2O 0.3%.
Clinker is composed of the following components: SiO269.7%, Al2O315.8%, Fe2O32.6%, TiO20.2%, CaO
2.4%, MgO 0.6%, K2O 4.4%, Na2O 3.1%, LOI 1.2%；
Preparation method is same as Example 2.
Embodiment 4
The present embodiment provides a kind of foamed ceramic produced using steel plant's tailings, formula and each raw material component
It is same as Example 3.
In addition to sintering curve, other are all the same for preparation method and embodiment 2.
Its sintering curve are as follows: from room temperature to 1000 DEG C, using the heating rate of 620 DEG C/h；
From 1000 DEG C to 1145 DEG C, using the heating rate of 450 DEG C/h；
1.5h is kept the temperature in firing temperature；
From firing temperature to 600 DEG C, using the rate of temperature fall of 560 DEG C/h；
From 600 DEG C to room temperature, using the rate of temperature fall of 400 DEG C/h；
Foamed ceramic in embodiment 1-6 is detected, wherein carried out using the method for defined in JGT 511-2017
Test properties；Test result is as follows shown in table:
The above is the preferred embodiment of invention, it is noted that those skilled in the art are come
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as this
The protection scope of invention.
Claims (9)
1. a kind of foamed ceramic produced using steel plant's tailings, which is characterized in that it is mainly by the raw material system of following parts by weight
At:
50~60 parts of the red tailing in Luoyuan, 15~20 parts of clinker, 10~20 parts of steel slag, 5~10 parts of quartz sand, 4~10 parts of clay, hair
0.5~5 part of infusion, 0.1~1 part of stabilizer；
The sum of each raw material component parts by weight are 100 parts；
In the steel slag, CaO+Fe2O3>=65wt%, in the clinker, SiO2+Al2O3>=80wt%.
2. as described in claim 1 using steel plant's tailings production foamed ceramic, which is characterized in that the steel slag mainly by
Following components in percentage by weight composition: SiO215~18%, Al2O34~6.5%, Fe2O338~44%, TiO20.1~
0.4%, CaO27~35%, MgO3~4%, K2O0.01~0.5%, Na2O0.01~0.5%.
3. as claimed in claim 2 using steel plant's tailings production foamed ceramic, which is characterized in that the clinker mainly by
Following components in percentage by weight composition: SiO265~72%, Al2O315~20%, Fe2O32~3%, TiO20.1~
0.5%, CaO2~3%, MgO0.5~1.5%, K2O4~6%, Na2O3~5%, LOI1~1.5%.
4. utilizing the foamed ceramic of steel plant's tailings production as claimed in claim 3, which is characterized in that the clay selects sieve
Source sand hill soil, mud washing or black mud it is one or more.
5. utilizing the foamed ceramic of steel plant's tailings production as claimed in claim 4, which is characterized in that the Luoyuan sand hill soil
It mainly consists of the following components in percentage by weight: SiO270~75%, Al2O312~16%, Fe2O30.5~1.5%,
CaO0.3~0.5%, MgO0.01~0.1%, K2O4~6%, Na2O3~5%, LOI1~5%；
The mud washing mainly consists of the following components in percentage by weight: SiO245~50%, Al2O332~36%, Fe2O3
2~3%, CaO0.01~0.1%, MgO0.3~0.5%, K2O2~3%, Na2O0.3~0.8%, LOI8~12%；
The black mud mainly consists of the following components in percentage by weight: SiO261~65%, Al2O320~24%, Fe2O3
1.5~3%, CaO0.3~1%, MgO0.3~0.5%, K2O1~2%, Na2O0.2~0.6%, LOI5~10%.
6. utilizing the foamed ceramic of steel plant's tailings production as described in claim 1, which is characterized in that the foaming agent is selected
One of silicon carbide, carbon dust or ceramic abrading block reclaimed materials are a variety of；The stabilizer selects manganese dioxide.
7. the foamed ceramic as claimed in any one of claims 1 to 6 produced using steel plant's tailings, which is characterized in that described low
The compression strength of thermally conductive foamed ceramic >=7 MPa, thermal coefficient≤0.1W/mK, bulk density are 170~250kg/m3, inhale
Water rate≤0.5%, IRa≤ 1.0, Ir≤1.0。
8. a kind of preparation method of the described in any item foamed ceramics using the production of steel plant's tailings of such as claim 1-7,
It is characterized in that, comprising:
(1) various raw materials are uniformly mixed according to formula, obtain mixture；
(2) mixture is subjected to ball milling, obtains slurry；
(3) slurry is subjected to mist projection granulating, obtains powder；
(4) the powder cloth is expected among high temperature sagger；
(5) high temperature sagger is placed in kiln, is burnt into according to default sintering curve, obtains low thermally conductive foamed ceramic finished product.
9. utilizing the preparation method of the foamed ceramic of steel plant's tailings production as claimed in claim 8, which is characterized in that described
Sintering curve are as follows:
From room temperature to 1000 DEG C, using the heating rate of 600~800 DEG C/h；
From 1000 DEG C to firing temperature, using the heating rate of 400~550 DEG C/h；
1~1.5h is kept the temperature in firing temperature；
From firing temperature to 600 DEG C, using the rate of temperature fall of 500~800 DEG C/h；
From 600 DEG C to room temperature, using the rate of temperature fall of 300~500 DEG C/h；
The firing temperature is 1140~1160 DEG C, and firing period is 5~8h.
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