CN102584318A - Method for preparing porous heat-insulating material from Cr-containing steel slag - Google Patents
Method for preparing porous heat-insulating material from Cr-containing steel slag Download PDFInfo
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Abstract
The invention belongs to the field of recycling economic techniques and building materials and particularly relates to a method for preparing a porous heat-insulating material from Cr-containing steel slag. The raw materials include base materials including Cr-containing steel slag and fly ash, binding materials including glass waste, clay and bentonite and pore forming agents including limestone, SiC, carbon powder, paraffin, stearic acid, organic fibers and millet. The method comprises the following steps: preparing 40 to 70 wt% of Cr-containing steel slag, 10 to 40 wt% of binding material and 5 to 30 wt% of pore forming agent, grinding, mixing, forming, demoulding and sintering to obtain an inorganic porous heat-insulating material. The invention provides a technology for high value recycle of Cr-containing steel slag, fly ash, glass waste; effectively solidifies heavy metal Cr and prevents environmental pollution due to heavy metal Cr. The porous heat-insulating material prepared by the invention is advantageous in light weight, heat preservation, heat insulation and flame retardancy, and can be widely applied in the fields of heat insulation of building exterior walls and heat-insulating materials for industrial use.
Description
Technical field
The invention belongs to recycling economy technology and building material field, relate to a kind of preparation technology of inorganic porous heat preservation plate material, be specifically related to a kind of employing and contain the method that the Cr slag prepares inorganic porous lagging material.
Background technology
Under the background of China industry and economic develop rapidly, along with the problem of generation is exactly that the resource and the energy extremely consume with environmental pollution and increases the weight of.Especially the output of industrial solid castoff sharply increases, and ecotope and HUMAN HEALTH are all caused very big threat.Cr steel (stainless steel and the high Cr steel) output that contains of China in 2010 is about 1,400 ten thousand tons, and according to 20% quantity of slag estimation, the whole nation has produced about 2,800,000 tons stainless steel slag.At present, containing Cr slag main methods is fragmentation, ball milling and magnetic separation, reclaims most of Fe, Ni metal and oxide compound, and remaining slag is mainly used in paves the way or landfill.Though although contain the restriction that chromated oxide in the Cr slag surpasses trade waste after the magnetic separation, Cr at any time can be with Cr
6+Form leach Cr
6+Ion is soluble in water, is prone to migration, is easy to be penetrated into underground water, and prolongs in time and seepage discharge increases gradually.Cr
6+Toxicity is strong, not only endangers ecotope, influences animal and plant growth, and can get into human body through digestive tube and skin, is distributed in liver and the kidney, or lodges in lung through respiratory tract, causes that diseases such as dermatitis, bronchitis, pneumonia and pulmonary emphysema take place.Therefore the harmless treatment that contains the Cr slag is considered to the bottleneck problem that Chinese stainless steel industry develops in a healthy way.
In recent years, study with the incrementization treatment technology containing the innoxious of Cr slag both at home and abroad always.Perhaps contain S or S if any method through in slag, adding FeS
2-Material slag is carried out upgrading, and guarantee sulphur massfraction>=0.2% in the slag; In slag, add a spot of B simultaneously
2O
3(0.1% ~ 0.5%) guarantees that the good flowability of slag is beneficial to the diffusion of material in the slag, reduces Cr
6+The leaching amount.But the affiliation that adds of sulfide containing material increases the sulfur in the returns, has increased the burden of desulfurization.The Donghee Park of Korea S Pu item University of Science and Technology etc. uses the Fe that from blast furnace slag, discharges under acidic conditions
2+Cr in the reducing solution
6+, the blast furnace slag of 1g can reduce the Cr of 56.1 (± 0.5) mg during pH=2
6+, and rate of reduction is along with the increase of the reduction of pH, blast furnace slag consumption and increase.Experiment proof can realize the detoxifcation of chromium with waste residue, but blast furnace slag and contain and contain a large amount of alkaline matters in the Cr slag can consume a large amount of sour agent, and processing costs is high.External main processing contains the method for Cr tailings; The one, as the aggregate of cement concrete and in addition special operation instruction; The 2nd, process hollow brick but can only be used in the interior wall of buildings, or can only and need as roadbed material when being used for Road construction with cement or bituminization.On the whole, contain the Cr slag and mainly adopt methods such as cement solidification, high temperature furnace slag reduction and hydrometallurgy.In these methods, the consumption of cement solidification is few and detoxifying effect is undesirable, still has Cr
6+Leaching; Though the high temperature furnace slag reduction method is with Cr
6+Be reduced to Cr
3+, not only energy loss is higher, and waste is difficult to regenerated using; The cost of wet reducing is high, and treatment capacity is less.
Summary of the invention
The present invention is directed to the present situation that solid waste such as containing Cr slag, flyash and cullet increases day by day; A kind of innoxious, high added value is provided and utilizes these waste recycle technology on a large scale; This method technology is simple, be easy to produce and the insulating, porous material property that obtains is superior, promotion prospect is wide, can significantly reduce environmental pollution and the comprehensive utilization that improves resource.
The technical scheme that the present invention adopted is: with contain the Cr slag, flyash is base-material; Cullet, clay and bentonitic one or more are sticker; One or more of Wingdale, SiC, carbon dust, paraffin, Triple Pressed Stearic Acid, organic fibre and millet are pore-forming material; With mass ratio 40% ~ 70% base-material, 10% ~ 40% sticker and 5% ~ 30% pore-forming material, obtain a kind of inorganic porous lagging material through fragmentation, batch mixing, shaping, the demoulding and sintering, its process step is following:
(1) fragmentation: will contain the powder particle that Cr slag and cullet etc. are broken into 1 ~ 3mm;
(2) batch mixing: mass ratio 40% ~ 70% base-material, 10% ~ 40% sticker and 5% ~ 30% pore-forming material are mixed, add water and be modulated into slurry, the mass ratio of water and compound is 10% ~ 40%;
(3) shaping and the demoulding: the slurry that modulates is inserted the dry back demoulding that is shaped in the mould obtain base substrate;
(4) sintering: place high temperature sintering furnace to carry out sintering base substrate, 700 ℃ ~ 1300 ℃ of sintering temperatures, soaking time 30min ~ 120min, the sample furnace cooling obtains the porous thermal insulating material afterwards.
The said Cr of containing slag is meant the slag that smelting stainless steel and high Cr steel alloy produce.
The present invention makes full use of physicalies such as chemical ingredients and the diameter of particle distribution of Cr slag; Make that Cr ion and other oxidation form highly stable mineral phase structure in the slag; Greatly reduce the Cr ionic and leach, when satisfying the ceramic performance requirement, utilize a large amount of CaCO that contain in the slag again
3, prepare porous material.
The inorganic porous lagging material of above-mentioned prepared is characterized in that: light weight, insulation, fire-retardant can be widely used in buildings and get exterior-wall heat insulation and industrial required lagging material etc.
Description of drawings
Fig. 1 operational path of the present invention;
Fig. 2 is the microtexture that contains Cr slag porous thermal insulating material that the present invention prepares.
Embodiment
Embodiment 1
Operational path of the present invention is as shown in Figure 1; Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation; It is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 40% to contain Cr slag, 20% flyash, and caking agent is 15% cullet, 10% wilkinite and 5% clay, and pore-forming material is 10% Wingdale, in mixer, mixes, and adds the water of mass ratio 10%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 900 ℃ of sintering temperatures, soaking time 120min, furnace cooling forms the porous thermal insulating material afterwards, and its microtexture is as shown in Figure 2.The volume density of the porous thermal insulating material that obtains is 0.89g/cm
3, porosity is 62%, thermal conductivity is 0.125W/ (mk).
Embodiment 2
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 50% to contain Cr slag, 10% flyash, and caking agent is the swelling of 10% cullet and 10%, and pore-forming material is 5% Wingdale and 15% SiC, in mixer, mixes, and adds the water of mass ratio 20%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1100 ℃ of sintering temperatures, soaking time 90min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.88g/cm
3, porosity is 63%, thermal conductivity is 0.120W/ (mk).
Embodiment 3
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 60% to contain Cr slag, 10% flyash, and caking agent is the clay of the % of 10% wilkinite and 10, and pore-forming material is 5% SiC and 5% carbon dust, in mixer, mixes, and adds the water of mass ratio 30%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1200 ℃ of sintering temperatures, soaking time 90min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.92g/cm
3, porosity is 58%, thermal conductivity is 0.132W/ (mk).
Embodiment 4
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 65% to contain Cr slag, 5% flyash, and caking agent is 15% cullet, and pore-forming material is 15% Wingdale, in mixer, mixes, and adds the water of mass ratio 40%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1300 ℃ of sintering temperatures, soaking time 60min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.92g/cm
3, porosity is 59%, thermal conductivity is 0.131W/ (mk).
Embodiment 5
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤150 μ m; Base-material is 50% to contain Cr slag, 10% flyash, and caking agent is 10% clay, and pore-forming material is 15% Wingdale and 15% SiC, in mixer, mixes, and adds the water of mass ratio 30%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1200 ℃ of sintering temperatures, soaking time 60min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.86g/cm
3, porosity is 65%, thermal conductivity is 0.113W/ (mk).
Embodiment 6
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 40% to contain Cr slag, 5% flyash; Caking agent is 10% cullet, 10% wilkinite and 10% clay, and pore-forming material is 5% Wingdale, 5% SiC and 15% carbon dust, in mixer, mixes; Add the water of mass ratio 40%, be modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1300 ℃ of sintering temperatures, soaking time 90min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.89g/cm
3, porosity is 61%, thermal conductivity is 0.127W/ (mk).
Embodiment 7
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 40% to contain Cr slag, 5% flyash, and caking agent is 10% cullet, 20% wilkinite and 10% clay, and pore-forming material is 15% carbon dust, in mixer, mixes, and adds the water of mass ratio 40%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 800 ℃ of sintering temperatures, soaking time 120min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.88g/cm
3, porosity is 63%, thermal conductivity is 0.118W/ (mk).
Embodiment 8
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 50% to contain Cr slag, 15% flyash, and caking agent is 5% cullet, 5% wilkinite and 20% clay, and pore-forming material is 5% SiC, in mixer, mixes, and adds the water of mass ratio 20%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 900 ℃ of sintering temperatures, soaking time 120min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.90g/cm
3, porosity is 60%, thermal conductivity is 0.129W/ (mk).
Embodiment 9
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 50% to contain Cr slag, 20% flyash, and caking agent is 15% wilkinite, and pore-forming material is 15% SiC, in mixer, mixes, and adds the water of mass ratio 30%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1250 ℃ of sintering temperatures, soaking time 90min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.89g/cm
3, porosity is 61%, thermal conductivity is 0.127W/ (mk).
Embodiment 10
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 40% to contain Cr slag, 20% flyash, and caking agent is 15% cullet, 10% wilkinite, and pore-forming material is 10% paraffin and 5% Triple Pressed Stearic Acid, in mixer, mixes, and adds the water of mass ratio 10%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 900 ℃ of sintering temperatures, soaking time 120min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.81g/cm
3, porosity is 66%, thermal conductivity is 0.103W/ (mk).
Embodiment 11
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 50% to contain Cr slag, 10% flyash, and caking agent is 10% cullet, 10% wilkinite, and pore-forming material is 5% paraffin, 15% millet, in mixer, mixes, and adds the water of mass ratio 20%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1100 ℃ of sintering temperatures, soaking time 90min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.78g/cm
3, porosity is 67%, thermal conductivity is 0.096W/ (mk).
Embodiment 12
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 60% to contain Cr slag, 10% flyash, and caking agent is 10% wilkinite, 10% clay, and pore-forming material is 5% millet, 5% organic fibre, in mixer, mixes, and adds the water of mass ratio 30%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1200 ℃ of sintering temperatures, soaking time 60min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.80g/cm
3, porosity is 64%, thermal conductivity is 0.116W/ (mk).
Embodiment 13
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material be base-material be 40% contain Cr slag, 30% flyash, caking agent is 20% wilkinite, pore-forming material is 5% organic fibre and 5% Triple Pressed Stearic Acid, in mixer, mixes, and adds the water of mass ratio 40%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1300 ℃ of sintering temperatures, soaking time 60min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.84g/cm
3, porosity is 60%, thermal conductivity is 0.129W/ (mk).
Embodiment 14
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 50% to contain Cr slag, 10% flyash; Caking agent is 5% cullet, 5% clay, and pore-forming material is 10% paraffin, 5% millet, 10% organic fibre, 5% Triple Pressed Stearic Acid, in mixer, mixes; Add the water of mass ratio 30%, be modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1200 ℃ of sintering temperatures, soaking time 60min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.77g/cm
3, porosity is 67%, thermal conductivity is 0.094W/ (mk).
Embodiment 15
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 40% to contain Cr slag, 5% flyash, and caking agent is 10% cullet, 10% wilkinite, 10% clay, and pore-forming material is 20% organic fibre, 5% Triple Pressed Stearic Acid, in mixer, mixes, and adds the water of mass ratio 40%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1300 ℃ of sintering temperatures, soaking time 60min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.78g/cm
3, porosity is 65%, thermal conductivity is 0.110W/ (mk).
Embodiment 16
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 40% to contain Cr slag, 5% flyash, and caking agent is 10% cullet, 20% wilkinite, 10% clay, and pore-forming material is 15% Triple Pressed Stearic Acid, in mixer, mixes, and adds the water of mass ratio 10%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1000 ℃ of sintering temperatures, soaking time 120min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.79g/cm
3, porosity is 67%, thermal conductivity is 0.091W/ (mk).
Embodiment 17
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 50% to contain Cr slag, 15% flyash, and caking agent is 20% clay, and pore-forming material is 10% millet, 5% Triple Pressed Stearic Acid, in mixer, mixes, and adds the water of mass ratio 20%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1250 ℃ of sintering temperatures, soaking time 90min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.80g/cm
3, porosity is 66%, thermal conductivity is 0.105W/ (mk).
Embodiment 18
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 50% to contain Cr slag, 10% flyash, and caking agent is 10% cullet, 10% clay, and pore-forming material is 20% organic fibre, in mixer, mixes, and adds the water of mass ratio 30%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1200 ℃ of sintering temperatures, soaking time 60min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.75g/cm
3, porosity is 69%, thermal conductivity is 0.082W/ (mk).
Embodiment 19
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material be 65% contain Cr slag, 5% flyash, caking agent is 15% clay, pore-forming material is 15% millet, in mixer, mixes, and adds the water of mass ratio 40%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1300 ℃ of sintering temperatures, soaking time 120min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.79g/cm
3, porosity is 68%, thermal conductivity is 0.086W/ (mk).
Embodiment 20
Utilize the preparation technology of the inorganic porous lagging material of stainless steel slag and fly-ash Preparation, it is characterized in that the preparation process is: will contain Cr slag, flyash and cullet etc. and carry out fragmentation and grinding, and make powder particle≤3mm; Base-material is 50% to contain Cr slag, 20% flyash, and caking agent is 20% wilkinite, and pore-forming material is 10% paraffin, in mixer, mixes, and adds the water of mass ratio 30%, is modulated into slurry; The slurry that modulates is injected mould be shaped, after the drying, carry out the demoulding at normal temperatures; Place high temperature sintering furnace to carry out sintering base substrate, 1200 ℃ of sintering temperatures, soaking time 90min, furnace cooling forms the porous thermal insulating material afterwards.The porous thermal insulating material property that obtains: volume density is 0.82g/cm
3, porosity is 62%, thermal conductivity is 0.125W/ (mk).
Claims (2)
1. one kind contains the method that the Cr slag prepares the porous thermal insulating material; It is characterized in that, with contain the Cr slag, flyash is base-material, cullet, clay and bentonitic one or more are sticker; One or more of Wingdale, SiC, carbon dust, paraffin, Triple Pressed Stearic Acid, organic fibre and millet are pore-forming material; With base-material, sticker and pore-forming material, obtain a kind of inorganic porous lagging material through fragmentation, batch mixing, shaping, the demoulding and sintering, its process step is following:
(1) fragmentation: will contain the powder particle that Cr slag and cullet etc. are broken into 1 ~ 3mm;
(2) batch mixing: mass ratio 40% ~ 70% base-material, 10% ~ 40% sticker and 5% ~ 30% pore-forming material mixed obtain compound, add water and be modulated into slurry, the mass ratio of water and compound is 10% ~ 40%;
(3) shaping and the demoulding: the slurry that modulates is inserted the dry back demoulding that is shaped in the mould obtain base substrate;
(4) sintering: place high temperature sintering furnace to carry out sintering base substrate, 700 ℃ ~ 1300 ℃ of sintering temperatures, soaking time 30min ~ 120min, the sample furnace cooling obtains the porous thermal insulating material afterwards.
2. the Cr of containing slag according to claim 1 prepares the method for porous thermal insulating material, it is characterized in that, the said Cr of containing slag is meant the slag that smelting stainless steel and high Cr steel alloy produce.
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| RU2588503C2 (en) * | 2014-09-26 | 2016-06-27 | Виктор Николаевич Соков | Method of producing high-temperature heat insulation |
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| CN107117940A (en) * | 2017-04-24 | 2017-09-01 | 东莞市佳乾新材料科技有限公司 | A kind of porous material based on modified steel scoria and preparation method thereof |
| CN108409346A (en) * | 2018-03-04 | 2018-08-17 | 李嘉顺 | A kind of Green environmental-protection building light cellular partition board and preparation method thereof |
| CN109553304A (en) * | 2018-12-29 | 2019-04-02 | 东北大学 | A kind of slag porous devitrified glass and preparation method thereof |
| CN110218827A (en) * | 2019-07-09 | 2019-09-10 | 鞍钢股份有限公司 | Molten blast furnace slag conditioning agent and preparation and use methods thereof |
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