CN108558378A - A kind of hierarchical porous structure bauxite clinker and preparation method thereof - Google Patents
A kind of hierarchical porous structure bauxite clinker and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of hierarchical porous structure bauxite clinkers and preparation method thereof.Its technical solution is：First using the soluble salt of the alumina raw material micro mist of 85~93wt%, the alumina powder of 0.1~10wt%, 0.1~5wt% fine silica powders and 0.1~8wt% as raw material, the additional water for accounting for the 30~50wt% of raw material, it is uniformly mixed in planetary ball mill, obtains pug；The pug is molded in de-airing extruder again, obtains green compact；Then the green compact are 12~36 hours dry under the conditions of 110~200 DEG C, 1~8 hour is kept the temperature to get hierarchical porous structure bauxite clinker under the conditions of 1550~1750 DEG C.The present invention is at low cost and simple for process, and prepared hierarchical porous structure bauxite clinker contains the micro-nano transgranular stomata of multistage, has the characteristics that mechanical property is good, thermal shock resistance is good, thermal conductivity is low and slag-resistant ability is strong.
Description
Technical field
The invention belongs to bauxite clinker technical fields.More particularly to a kind of hierarchical porous structure bauxite clinker and its preparation side
Method.
Background technology
With economic rapid development, the demand to the energy such as high energy consumption industry such as steel, cement, power industry increasingly increases
Add, energy shortage becomes increasingly conspicuous with the contradiction that demand increases sharply.Modern high temperature industry does not require nothing more than used refractory material
With excellent mechanical strength, Spalling resistance can well and anti-erosion and performance of flushing it is excellent, also require low energy consumption and the thermal efficiency
It is high.Therefore, exploitation meets the high-quality refractory material of above-mentioned multiple functions as the research emphasis of refractories industry.
Refractory material for working layer lightweight be considered as be possible to realize refractory material have high-quality, it is multi-functional effectively
Approach.First, lightweight can promote the heat-proof quality of working lining, reduce heat dissipation, to reduce heat loss and heating cost,
It is advantageously implemented energy-saving and emission-reduction；Secondly, the stomata introduced in weight reduction process can effectively accommodate thermal stress in jump in temperature,
Be conducive to be promoted the Spalling resistance energy of refractory material for working layer；Finally, when prepared light weight refractory material pore size compared with
Hour, the slag resistance of refractory material and mechanical strength are influenced little, in some instances it may even be possible to be promoted.
However, the stomata introduced in weight reduction process can have an impact the mechanical strength and resistance to slag of material, therefore,
The light-weighted key of refractory material for working layer is to make it have reliable mechanical strength and slag resistance.Since refractory material is light
Quantization is typically to be realized by preparing light weight refractory aggregate, it is generally recognized that reduces apparent porosity and the hole of light weight refractory material
Diameter is expected to realize the balance between low thermal conductivity, high mechanical properties and reliable slag resistance.
In recent years, carried out all over the world many about light weight aggregate and its corresponding working lining light weight refractory material
Research, and many methods for preparing light weight aggregate are reported, mainly pass through two ways pore-forming：(1) certain is introduced in green compact
A little substances that can take up certain space, it is thermally treated by the substance decomposition or discharge, to form hole, such as add pore creating material
Method, decomposition in situ method, direct foaming etc..(2) by particle packing shape in green compact by being introduced into additive or fine particle
At hole be stored in material internal, such as granulation mass area method, reaction bonded method.The former is due to substance during heat treatment point
The channel that solution and discharge will necessarily be formed, hole exist in the form of open pore；The latter is mainly by reducing material sintering
Diffusion rate in the process is to hinder the discharge of hole；However, being suppressed due to spreading, crystal boundary rate travel also drops therewith
Low, the hole of material internal is also mainly apparent pore.
In conclusion it is higher using the usual apparent porosity of refractory aggregate prepared by the above method, aperture is larger, used
The erosion and infiltration of slag and high-temperature medium can not be resisted in journey.
Invention content
The present invention is directed to overcome prior art defect, task to be to provide hierarchical porous structure a kind of at low cost and simple for process
The preparation method of bauxite clinker；The hierarchical porous structure bauxite clinker prepared with this method is containing the multistage transgranular stomata of micro-nano, mechanics
Performance is good, thermal shock resistance is good, thermal conductivity is low and slag-resistant ability is strong.
For the above-mentioned task of realization, the technical solution adopted in the present invention is：First with the alumina raw material micro mist of 85~93wt%,
The soluble salt of the alumina powder of 0.1~10wt%, the fine silica powder of 0.1~5wt% and 0.1~8wt% is raw material, outside
Add the water for accounting for the 30~50wt% of raw material, is uniformly mixed to get pug in planetary ball mill；Then by the pug true
It is molded in empty mud extruder, obtains green compact；Again by the green compact dry 12~36 hours under the conditions of 110~200 DEG C, 1550~
1~8 hour is kept the temperature under the conditions of 1750 DEG C, hierarchical porous structure bauxite clinker is made.
The Al of the alumina raw material micro mist2O3Content >=45wt%, grain size D50It is 1~10 μm.
The Al of the alumina powder2O3Content >=98wt%, grain size D50It is 1~8 μm.
The SiO of the fine silica powder2Content >=90wt%, grain size D50It is 0.1~3 μm.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
1~4 kind in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Due to the adoption of the above technical scheme, the present invention has following good effect compared with prior art：
(1) present invention introduces soluble salts, are hydrolyzed when soluble salt is dissolved in the water, and can form hydrated cation, should
Hydrated cation exists in the form of the tetramer or dimer, and the bridge formation hydroxyl that hydrated cation has can be connected with each other, from
And the network structure with nanoaperture is formed in situ.Present invention introduces water and alumina raw material micro mist during heat treatment can
Micro-void structures are enough formed in situ.
(2) present invention during heat treatment, on the one hand, the nano-particle and alum that the tetramer or dimer are decomposed to form
Autochthonal material micro mist forms dislocation sintering, and due to the difference of the two sintering character, in-situ stress is formed in particle neck；Another party
Face, the alumina powder and fine silica powder of introducing can react with alumina raw material micro mist, the volume in reaction process
Expansion will form corresponding force in situ in material internal.Above-mentioned in-situ stress and corresponding force in situ can promote the high temperature of nano-particle
Superplasticity plays, and crystal boundary fast moves so that above-mentioned micron and nanoaperture are by quick closure in intra-die.In addition, nanometer
Particle has larger surface diffusivity and surface energy, can reduce the segmentation off-period of transgranular stomata so that transgranular stomata
By Fast Segmentation at largely more small nano level stomata, to form the multistage transgranular air hole structure of micro-nano.
(3) presence of the multistage transgranular stomata of micro-nano can reduce the heat conduction system of hierarchical porous structure bauxite clinker first
Number；Secondly, can absorb reduces the energy of crack propagation, and makes crackle that bridging and deflection occur, and promotes hierarchical porous structure alum
The mechanical property of native clinker；Finally, when being reacted with slag, be conducive to the slagging of retractory mutually supersaturation and crystal growth rate increase, it is former
Position forms separation layer, promotes the slag-resistant performance of hierarchical porous structure bauxite clinker.
Hierarchical porous structure bauxite clinker prepared by the present invention is after testing：Bulk density is 2.7~3.2g/cm3；Apparent pore
Rate is 2~12%；Thermal coefficient is 2.3~4.0Wm at 800 DEG C-1·K-1；Average pore size is 100~300nm.
Therefore, the present invention is at low cost and simple for process, and prepared hierarchical porous structure bauxite clinker is multistage brilliant containing micro-nano
Inner air vent has the characteristics that mechanical property is good, thermal shock resistance is good, thermal conductivity is low and slag-resistant ability is strong.
Specific implementation mode
The invention will be further described With reference to embodiment, not limiting of its scope.
It is first that the raw material Unify legislation involved by present embodiment is as follows to avoid repeating, it is no longer superfluous in embodiment
It states：
The Al of the alumina raw material micro mist2O3Content >=45wt%, grain size D50It is 1~10 μm.
The Al of the alumina powder2O3Content >=98wt%, grain size D50It is 1~8 μm.
The SiO of the fine silica powder2Content >=90wt%, grain size D50It is 0.1~3 μm.
Embodiment 1
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 85~87wt%, 8.0~
The soluble salt of the alumina powder of 10wt%, the fine silica powder of 2~5wt% and 2~4wt% is raw material, it is additional account for it is described
The water of 30~40wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 12~24 hours dry under the conditions of 150~200 DEG C, in 1550~1650 DEG C of items
4~8 hours are kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
One kind in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 3.1~3.2g/cm3；Aobvious gas
Porosity is 2~6%；Thermal coefficient is 3.8~4.0Wm at 800 DEG C-1·K-1；Average pore size is 100~200nm.
Embodiment 2
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 85~87wt%, 8.0~
The soluble salt of the alumina powder of 10wt%, the fine silica powder of 2~5wt% and 2~4wt% is raw material, it is additional account for it is described
The water of 30~40wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 24~36 hours dry under the conditions of 110~160 DEG C, in 1650~1750 DEG C of items
1~5 hour is kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of two kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 3.05~3.15g/cm3；It is aobvious
The porosity is 3~7%；Thermal coefficient is 3.7~3.9Wm at 800 DEG C-1·K-1；Average pore size is 100~200nm.
Embodiment 3
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 85~87wt%, 8.0~
The soluble salt of the alumina powder of 10wt%, the fine silica powder of 2~5wt% and 2~4wt% is raw material, it is additional account for it is described
The water of 40~50wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 12~24 hours dry under the conditions of 150~200 DEG C, in 1550~1650 DEG C of items
4~8 hours are kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of three kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 3.1~3.2g/cm3；Aobvious gas
Porosity is 3~8%；Thermal coefficient is 3.5~3.8Wm at 800 DEG C-1·K-1；Average pore size is 100~200nm.
Embodiment 4
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 85~87wt%, 8.0~
The soluble salt of the alumina powder of 10wt%, the fine silica powder of 2~5wt% and 2~4wt% is raw material, it is additional account for it is described
The water of 40~50wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 24~36 hours dry under the conditions of 110~160 DEG C, in 1650~1750 DEG C of items
1~5 hour is kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of four kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 3.1~3.2g/cm3；Aobvious gas
Porosity is 3~7%；Thermal coefficient is 3.6~3.8Wm at 800 DEG C-1·K-1；Average pore size is 100~200nm.
Embodiment 5
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 87~89wt%, 5~
The soluble salt of the alumina powder of 8wt%, the fine silica powder of 2~5wt% and 0.1~3wt% is raw material, it is additional account for it is described
The water of 30~40wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 12~24 hours dry under the conditions of 150~200 DEG C, in 1550~1650 DEG C of items
4~8 hours are kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
One kind in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 3.1~3.2g/cm3；Aobvious gas
Porosity is 5~8%；Thermal coefficient is 3.1~3.4Wm at 800 DEG C-1·K-1；Average pore size is 150~250nm.
Embodiment 6
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 87~89wt%, 5~
The soluble salt of the alumina powder of 8wt%, the fine silica powder of 2~5wt% and 0.1~3wt% is raw material, it is additional account for it is described
The water of 30~40wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 24~36 hours dry under the conditions of 110~160 DEG C, in 1650~1750 DEG C of items
1~5 hour is kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of two kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 3.0~3.1g/cm3；Aobvious gas
Porosity is 4~7%；Thermal coefficient is 3.3~3.6Wm at 800 DEG C-1·K-1；Average pore size is 150~300nm.
Embodiment 7
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 87~89wt%, 5~
The soluble salt of the alumina powder of 8wt%, the fine silica powder of 2~5wt% and 0.1~3wt% is raw material, it is additional account for it is described
The water of 40~50wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 12~24 hours dry under the conditions of 150~200 DEG C, in 1550~1650 DEG C of items
4~8 hours are kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of three kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 3.0~3.15g/cm3；It is aobvious
The porosity is 5~9%；Thermal coefficient is 3.2~3.5Wm at 800 DEG C-1·K-1；Average pore size is 150~250nm.
Embodiment 8
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 87~89wt%, 5~
The soluble salt of the alumina powder of 8wt%, the fine silica powder of 2~5wt% and 0.1~3wt% is raw material, it is additional account for it is described
The water of 40~50wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 24~36 hours dry under the conditions of 110~160 DEG C, in 1650~1750 DEG C of items
1~5 hour is kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of four kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 2.95~3.05g/cm3；It is aobvious
The porosity is 5~8%；Thermal coefficient is 3.4~3.7Wm at 800 DEG C-1·K-1；Average pore size is 150~250nm.
Embodiment 9
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 89~91wt%, 3~
The soluble salt of the alumina powder of 5wt%, the fine silica powder of 0.1~3wt% and 3~5wt% is raw material, it is additional account for it is described
The water of 30~40wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 12~24 hours dry under the conditions of 150~200 DEG C, in 1550~1650 DEG C of items
4~8 hours are kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
One kind in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 2.85~3.05g/cm3；It is aobvious
The porosity is 7~11%；Thermal coefficient is 2.7~2.9Wm at 800 DEG C-1·K-1；Average pore size is 200~300nm.
Embodiment 10
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 89~91wt%, 3~
The soluble salt of the alumina powder of 5wt%, the fine silica powder of 0.1~3wt% and 3~5wt% is raw material, it is additional account for it is described
The water of 30~40wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 24~36 hours dry under the conditions of 110~160 DEG C, in 1650~1750 DEG C of items
1~5 hour is kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of two kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 2.85~3.1g/cm3；It is aobvious
The porosity is 7~10%；Thermal coefficient is 2.8~3.0Wm at 800 DEG C-1·K-1；Average pore size is 150~250nm.
Embodiment 11
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 89~91wt%, 3~
The soluble salt of the alumina powder of 5wt%, the fine silica powder of 0.1~3wt% and 3~5wt% is raw material, it is additional account for it is described
The water of 40~50wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 12~24 hours dry under the conditions of 150~200 DEG C, in 1550~1650 DEG C of items
4~8 hours are kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of three kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 2.95~3.15g/cm3；It is aobvious
The porosity is 6~10%；Thermal coefficient is 2.9~3.2Wm at 800 DEG C-1·K-1；Average pore size is 150~250nm.
Embodiment 12
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 89~91wt%, 3~
The soluble salt of the alumina powder of 5wt%, the fine silica powder of 0.1~3wt% and 3~5wt% is raw material, it is additional account for it is described
The water of 40~50wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 24~36 hours dry under the conditions of 110~160 DEG C, in 1650~1750 DEG C of items
1~5 hour is kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of four kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 3.0~3.15g/cm3；It is aobvious
The porosity is 7~9%；Thermal coefficient is 3.0~3.3Wm at 800 DEG C-1·K-1；Average pore size is 200~300nm.
Embodiment 13
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 91~93wt%, 0.1~
The soluble salt of the alumina powder of 3wt%, the fine silica powder of 0.1~3wt% and 4~8wt% is raw material, it is additional account for it is described
The water of 30~40wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 12~24 hours dry under the conditions of 150~200 DEG C, in 1550~1650 DEG C of items
4~8 hours are kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
One kind in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 2.7~2.95g/cm3；It is aobvious
The porosity is 7~11%；Thermal coefficient is 2.3~2.5Wm at 800 DEG C-1·K-1；Average pore size is 150~250nm.
Embodiment 14
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 91~93wt%, 0.1~
The soluble salt of the alumina powder of 3wt%, the fine silica powder of 0.1~3wt% and 4~8wt% is raw material, it is additional account for it is described
The water of 30~40wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 24~36 hours dry under the conditions of 110~160 DEG C, in 1650~1750 DEG C of items
1~5 hour is kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of two kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 2.75~2.9g/cm3；It is aobvious
The porosity is 8~12%；Thermal coefficient is 2.4~2.6Wm at 800 DEG C-1·K-1；Average pore size is 150~250nm.
Embodiment 15
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 91~93wt%, 0.1~
The soluble salt of the alumina powder of 3wt%, the fine silica powder of 0.1~3wt% and 4~8wt% is raw material, it is additional account for it is described
The water of 40~50wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 12~24 hours dry under the conditions of 150~200 DEG C, in 1550~1650 DEG C of items
4~8 hours are kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of three kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 2.9~3.15g/cm3；It is aobvious
The porosity is 7~12%；Thermal coefficient is 2.6~2.8Wm at 800 DEG C-1·K-1；Average pore size is 200~300nm.
Embodiment 16
A kind of hierarchical porous structure bauxite clinker and preparation method thereof.First with the alumina raw material micro mist of 91~93wt%, 0.1~
The soluble salt of the alumina powder of 3wt%, the fine silica powder of 0.1~3wt% and 4~8wt% is raw material, it is additional account for it is described
The water of 40~50wt% of raw material is uniformly mixed in planetary ball mill to get pug；Then by the pug in de-airing extruder
Middle molding, obtains green compact；It is again that the green compact are 24~36 hours dry under the conditions of 110~160 DEG C, in 1650~1750 DEG C of items
1~5 hour is kept the temperature under part, hierarchical porous structure bauxite clinker is made.
The soluble salt is aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, nitric acid
The mixture of four kinds of substances in oxygen zirconium, zirconium sulfate, zirconium carbonate ammonium, zirconium nitrate and titanium chloride.
Hierarchical porous structure bauxite clinker prepared by the present embodiment is after testing：Bulk density is 2.8~3.1g/cm3；Aobvious gas
Porosity is 7~11%；Thermal coefficient is 2.5~2.7Wm at 800 DEG C-1·K-1；Average pore size is 200~300nm.
Present embodiment has following good effect compared with prior art：
(1) present embodiment introduces soluble salt, is hydrolyzed when soluble salt is dissolved in the water, and can form hydration sun
Ion, the hydrated cation exist in the form of the tetramer or dimer, and the bridge formation hydroxyl that hydrated cation has can be mutual
Connection, to which the network structure with nanoaperture be formed in situ.The water and alumina raw material micro mist that present embodiment introduces
Micro-void structures can be formed in situ during heat treatment.
(2) present embodiment is during heat treatment, on the one hand, the nanometer that the tetramer or dimer are decomposed to form
Particle forms dislocation sintering with alumina raw material micro mist, and due to the difference of the two sintering character, in-situ stress is formed in particle neck；
On the other hand, the alumina powder and fine silica powder of introducing can react with alumina raw material micro mist, in reaction process
Volume expansion will form corresponding force in situ in material internal.Above-mentioned in-situ stress and corresponding force in situ can promote nano-particle
High-temperature Superplasticity play, crystal boundary fast moves so that above-mentioned micron and nanoaperture are by quick closure in intra-die.This
Outside, nano-particle has larger surface diffusivity and surface energy, can reduce the segmentation off-period of transgranular stomata so that brilliant
Inner air vent by Fast Segmentation at largely more small nano level stomata, to form the multistage transgranular air hole structure of micro-nano.
(3) presence of the multistage transgranular stomata of micro-nano can reduce the heat conduction system of hierarchical porous structure bauxite clinker first
Number；Secondly, can absorb reduces the energy of crack propagation, and makes crackle that bridging and deflection occur, and promotes hierarchical porous structure alum
The mechanical property of native clinker；Finally, when being reacted with slag, be conducive to the slagging of retractory mutually supersaturation and crystal growth rate increase, it is former
Position forms separation layer, promotes the slag-resistant performance of hierarchical porous structure bauxite clinker.
Hierarchical porous structure bauxite clinker prepared by present embodiment is after testing：Bulk density is 2.7~3.2g/
cm3；Apparent porosity is 2~12%；Thermal coefficient is 2.3~4.0Wm at 800 DEG C-1·K-1；Average pore size be 100~
300nm。
Therefore, present embodiment is at low cost and simple for process, prepared hierarchical porous structure bauxite clinker containing it is micro--receive
The multistage transgranular stomata of rice, has the characteristics that mechanical property is good, thermal shock resistance is good, thermal conductivity is low and slag-resistant ability is strong.
Claims (6)
1. a kind of preparation method of hierarchical porous structure bauxite clinker, which is characterized in that first micro- with the alumina raw material of 85~93wt%
Powder, the alumina powder of 0.1~10wt%, the fine silica powder of 0.1~5wt% and 0.1~8wt% soluble salt be original
Material, the additional water for accounting for the 30~50wt% of raw material are uniformly mixed in planetary ball mill to get pug；Then by the mud
Material is molded in de-airing extruder, obtains green compact；It is again that the green compact are 12~36 hours dry under the conditions of 110~200 DEG C,
1~8 hour is kept the temperature under the conditions of 1550~1750 DEG C, hierarchical porous structure bauxite clinker is made.
2. the preparation method of hierarchical porous structure bauxite clinker according to claim 1, it is characterised in that the alumina raw material
The Al of micro mist2O3Content >=45wt%, grain size D50It is 1~10 μm.
3. the preparation method of hierarchical porous structure bauxite clinker according to claim 1, it is characterised in that the aluminium oxide is micro-
The Al of powder2O3Content >=98wt%, grain size D50It is 1~8 μm.
4. the preparation method of hierarchical porous structure bauxite clinker according to claim 1, it is characterised in that the silica
The SiO of micro mist2Content >=90wt%, grain size D50It is 0.1~3 μm.
5. the preparation method of hierarchical porous structure bauxite clinker according to claim 1, it is characterised in that the soluble salt is
Aluminium chloride, aluminum nitrate, magnesium chloride, magnesium nitrate, magnesium sulfate, zirconium chloride, basic zirconium chloride, zirconyl nitrate, zirconium sulfate, zirconium carbonate
1~4 kind in ammonium, zirconium nitrate and titanium chloride.
6. a kind of hierarchical porous structure bauxite clinker, it is characterised in that the hierarchical porous structure bauxite clinker is according to claim
Hierarchical porous structure bauxite clinker prepared by the preparation method of hierarchical porous structure bauxite clinker described in any one of book 1~5.
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Application publication date: 20180921 Assignee: WUHAN SIGENYUAN ELECTRIC CONTROL EQUIPMENT Co.,Ltd. Assignor: WUHAN University OF SCIENCE AND TECHNOLOGY Contract record no.: X2021420000028 Denomination of invention: The invention relates to a multi-stage pore structure bauxite clinker and a preparation method thereof Granted publication date: 20210316 License type: Common License Record date: 20210929 |