CN117902881A - Composite refractory material for ferrotitanium vacuum smelting ramming furnace lining and application thereof - Google Patents
Composite refractory material for ferrotitanium vacuum smelting ramming furnace lining and application thereof Download PDFInfo
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- 238000003723 Smelting Methods 0.000 title claims abstract description 74
- 229910001200 Ferrotitanium Inorganic materials 0.000 title claims abstract description 69
- 239000011819 refractory material Substances 0.000 title claims abstract description 33
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 170
- 239000000843 powder Substances 0.000 claims abstract description 103
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 92
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000005245 sintering Methods 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 27
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 21
- 239000000956 alloy Substances 0.000 claims abstract description 21
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 21
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 20
- 239000000654 additive Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 24
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 17
- 239000012267 brine Substances 0.000 claims description 15
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 15
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 claims description 14
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 14
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 12
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229910000805 Pig iron Inorganic materials 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 239000007767 bonding agent Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims 9
- 230000008018 melting Effects 0.000 claims 9
- 238000000034 method Methods 0.000 abstract description 28
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 235000019580 granularity Nutrition 0.000 description 32
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 14
- 239000010936 titanium Substances 0.000 description 14
- 229910052719 titanium Inorganic materials 0.000 description 14
- 230000000996 additive effect Effects 0.000 description 9
- 238000004321 preservation Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The composite refractory material for the ferrotitanium vacuum smelting ramming furnace lining takes fused magnesia as a base material, zirconia powder, zirconium boride powder, chromite powder, chromia powder and light burned active magnesia powder as additives, and the preparation steps are as follows: adding binding agent into fused magnesia for primary mixing, then adding zirconia powder, zirconium boride powder, chromium oxide powder, chromite powder and light-burned active magnesia powder, adding binding agent for secondary mixing, and finally trapping to obtain the composite refractory material. The advantages are that: the composite refractory material is prepared by taking fused magnesia as a basic raw material, adding zirconia, zirconium boride, chromium oxide, chromite and light burned active magnesia powder into the fused magnesia, and combining a sintering process to form a furnace lining, so that the smelting heat of a ferrotitanium smelting furnace can be improved, the high-temperature corrosion resistance is realized, the service life of the furnace lining is prolonged, and the continuity and stability of ferrotitanium alloy smelting are ensured.
Description
Technical Field
The invention relates to a composite refractory material for a titanium-iron alloy vacuum smelting ramming furnace lining and application thereof.
Background
Ferrotitanium is one of intermediate alloys, and can be classified into high ferrotitanium, medium ferrotitanium and low ferrotitanium according to the difference of titanium content in the alloy. An induction furnace is generally used for smelting the titanium alloy, and the titanium metal has high activity, so that the corrosion resistance of the furnace lining material is very strict in the smelting process of the ferrotitanium alloy.
At present, in the actual production process of titanium alloy, the commonly used refractory lining material is fused magnesia, and a ramming mode is adopted to prepare the lining. The service life of the furnace lining prepared in the mode is usually not more than 30 times, and knotting and sintering work of the furnace lining is required to be frequently carried out in the production process, so that the continuity and stability of the ferrotitanium production process are seriously affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing a composite refractory material for a ferrotitanium vacuum smelting ramming furnace lining and application thereof, which can improve the smelting heat of a ferrotitanium smelting furnace, has high-temperature erosion resistance, prolongs the service life of the furnace lining and ensures the continuity and stability of ferrotitanium smelting.
The technical scheme of the invention is as follows:
A composite refractory material for a titanium-iron alloy vacuum smelting ramming furnace lining is characterized in that:
The composite refractory material takes fused magnesia as a base material, zirconia powder, zirconium boride powder, chromite powder, chromium oxide powder and light-burned active magnesia powder as additives, and comprises the following steps of:
A. processing the raw materials of the fused magnesia:
Crushing the fused magnesia lump materials, and screening the fused magnesia lump materials into fused magnesia granules with the granularity of 8-10 mm, fused magnesia granules with the granularity of 4-5 mm and fused magnesia powder with the fineness of 70-100 meshes;
B. Primary mixing:
According to the weight percentage, 1-3 parts of fused magnesia particles with the granularity of 8-10 mm mm, 14-15 parts of fused magnesia particles with the granularity of 4-5mm and 2-3 parts of fused magnesia powder with the granularity of 70-100 meshes are mixed, then binding agent A brine is added, the adding amount of the binding agent A brine is 4-6% of the total mass of the fused magnesia, and the mixture is mixed in a V-type mixer for 10 minutes;
C. Secondary mixing:
Adding zirconia powder, zirconium boride powder, chromium oxide powder, chromite powder and light-burned active magnesia powder on the basis of primary mixing, wherein the fineness of the zirconia powder, the zirconium boride powder, the chromium oxide powder and the chromite powder is 120-200 meshes; the fineness of the active magnesium oxide powder is 180-300 meshes, a secondary mixture is obtained after mixing, a bonding agent B phosphoric acid is added, the adding amount of the bonding agent B phosphoric acid accounts for 1-1.5% of the total mass of the secondary mixture, secondary mixing is carried out in a V-shaped mixer, and mixing is carried out for 30 minutes;
D. Trapping:
And after mixing, ageing the mixture for 3-5 hours at room temperature to obtain the composite refractory material for the titanium-iron alloy vacuum smelting ramming furnace lining.
Further, the MgCl 2 content in the bond A brine is not less than 55wt%.
Further, the mass concentration of the bond B phosphoric acid is not less than 65wt%.
Further, the MgO content in the fused magnesia is not less than 95wt%, the ignition loss is not more than 1.5wt%, and the SiO 2 content is not more than 1.4wt%.
Further, the zirconia powder is fused zirconia, the content of ZrO 2 is not less than 96wt%, the content of Al 2O3 is not more than 1.5wt%, and the content of SiO 2 is not more than 1.3wt%.
Further, the content of ZrB 2 in the zirconium boride is not less than 98wt%.
Further, the content of Cr 2O3 in the ferrochrome ore powder is not less than 45wt percent, and the content of SiO 2 is not more than 1wt percent; the chromium oxide powder contains Cr 2O3 of not less than 99wt%.
Further, the MgO content in the light burned active magnesium oxide is not less than 95wt%, the ignition loss is less than 2.5wt%, and the SiO 2 content is not more than 1wt%.
The application of the composite refractory material in the vacuum smelting ramming furnace lining of ferrotitanium alloy.
Further, the composite refractory material for the furnace lining for the ferrotitanium vacuum smelting ramming furnace is rammed and the furnace lining after ramming furnace construction is baked for 8-10 hours, and when the furnace is baked, the furnace is baked for 3-5 hours below 300 ℃; heating the furnace at the speed of 3 ℃/min-5 ℃/min at 300 ℃ -800 ℃, preserving heat for 1 hour at 500 ℃, and preserving heat for not less than 2 hours at 800 ℃; and then sintering under vacuum condition, wherein the sintering raw material adopts pig iron, the sintering temperature is 1600-1700 ℃, the sintering time is 3-5 hours, and the sintering is completed, so that the furnace lining for vacuum smelting and ramming of ferrotitanium alloy is obtained.
The invention has the beneficial effects that:
The fused magnesia is used as a basic raw material, zirconia, zirconium boride, chromium oxide, chromite and light burned active magnesia powder are added into the fused magnesia, and a refractory lining is prepared by a ramming sintering process, so that the smelting heat of a ferrotitanium smelting furnace can be effectively improved, the problems of poor high-temperature corrosion resistance and short service life of the lining of a ferrotitanium smelting refractory material are solved, and the continuity and stability of ferrotitanium smelting are effectively ensured. The smelting furnace lining prepared from the material has long smelting period, good economy and low ferrotitanium impurity introduction rate, and is beneficial to the large-scale development of ferrotitanium smelting production equipment.
Detailed Description
Example 1 application to Low titanium iron (titanium content 25wt% to 35wt% in titanium iron)
A. Processing of substrate material electro-fused magnesia
Taking fused magnesia blocks with the magnesium oxide content of 96 grades, wherein the magnesium oxide content is 95.84 weight percent, the burning loss is 0.15 weight percent, the SiO 2 content is 1.38 weight percent, the CaO content is 1.25 weight percent, crushing the fused magnesia blocks to be less than 10 mm, screening the crushed magnesia blocks into three granularities of 8-10 mm, 4-5 mm and 70-100 meshes;
B. One-time mixing
Mixing three types of fused magnesia with the granularity of 8-10 mm, 4-5 mm and 70-100 meshes according to the mass ratio of 1:14:3, wherein the weights of fused magnesia particles with the granularity of 8-10 mm, fused magnesia particles with the granularity of 4-5 mm and fused magnesia powder with the fineness of 70-100 meshes are respectively as follows: 50kg, 700kg and 150kg of binding agent A brine is added, uniformly mixed, the adding amount of the binding agent A brine is 54kg, the MgCl 2 content 55wt% in the brine is mixed for 10 minutes in a V-type mixer;
C. Selection of additives
The zirconia powder is selected from fused zirconia powder, the content of ZrO 2 is 98wt%, the content of Al 2O3 is not higher than 1.5wt%, the content of SiO 2 is not higher than 1.3wt%, and the granularity is 180 meshes
Zirconium boride powder: zrB 2 purity 98wt% and granularity 180 mesh;
Chromite powder: 46.09wt% of Cr 2O3, 0.861wt% of SiO 2, 15.39wt% of Al 2O3, 0.22wt% of CaO, 10.20wt% of MgO, 25.29wt% of FeO and 180 meshes of granularity;
chromium oxide powder: purity 99wt%, granularity 180 mesh;
Light burned active magnesium oxide powder: mgO content 95.33wt%, ignition loss 2.35wt%, siO 2 content 0.56wt% and granularity 300 mesh;
D. Additive for preparing materials
Premixing selected additives according to the following proportion:
zirconia powder: zirconium boride powder: chromite powder: chromium oxide powder: the mass ratio of the light burned active magnesium oxide powder is 1:0.2:1:2:2
Wherein the weight of each raw material is as follows: 10kg of zirconia powder, 2kg of zirconium boride powder, 10kg of chromite powder, 20kg of chromium oxide powder and 20kg of light burned active magnesia powder, and mixing in a mixer for 30 minutes to obtain an additive;
E. secondary mixed material and trapped material
Adding the prepared additive into a base material, uniformly mixing, gradually adding phosphoric acid as an adhesive in the mixing process, adjusting the concentration of the phosphoric acid to 75wt%, adding 10kg, and carrying out secondary mixing in a V-shaped mixer for 30 minutes; after mixing, ageing the mixture for 3 hours at room temperature to obtain the composite refractory material for the titanium-iron alloy vacuum smelting ramming furnace lining;
F. Ramming and baking furnace
Tamping a composite refractory material for a titanium-iron alloy vacuum smelting and tamping furnace lining to construct a furnace, wherein a machine is used for tamping in the tamping process;
The furnace lining after ramming needs to be subjected to a furnace baking process; the baking process is strictly carried out according to a baking curve, and the whole baking time is 9 hours; wherein:
drying the furnace for 3.5 hours at the temperature below 300 ℃ and mainly drying the adhering water in the furnace lining;
heating up the furnace at a speed of 4 ℃/min under 300-800 ℃ and preserving heat for 1 hour at 500 ℃ to remove crystal water in the furnace lining, and heating up to 800 ℃ and preserving heat;
G. Furnace lining sintering
The ferrotitanium smelting furnace lining adopts a first furnace sintering method, and the sintering raw material adopts pig iron; in order to prevent oxidation of the material caused by overlong sintering time in the first furnace, the sintering process is carried out under vacuum condition, the sintering temperature is 1650 ℃, and the heat preservation time is 4 hours. The thickness of the top end of the ferrotitanium alloy smelting furnace lining is 70mm, the thickness of the bottom end of the ferrotitanium alloy smelting furnace lining is 90mm, the service life of a smelting period of ferrotitanium (the titanium content in ferrotitanium is 25-35 wt%) is 70 heats, and the service life of the smelting period is only 30 heats when the electric smelting magnesia furnace lining is used under the same condition.
Example 2 application to Medium titanium (titanium content in ferrotitanium 40wt% to 60 wt%)
A. processing of substrate material electro-fused magnesia
Taking electric smelting magnesia blocks with the magnesium oxide content of 97 grades, wherein the magnesium oxide content is 96.47wt%, the burning loss is 0.13wt%, the SiO 2 content is 1.26wt%, the CaO content is 1.12wt%, crushing the electric smelting magnesia blocks to be less than 10 mm, screening the crushed magnesia blocks into three granularities of 8-10 mm, 4-5 mm and 70-100 meshes;
B. One-time mixing
Mixing three types of fused magnesia with the granularity of 8-10 mm, 4-5 mm and 70-100 meshes according to the mass ratio of 2:13:3, wherein the weights of fused magnesia particles with the granularity of 8-10 mm, fused magnesia particles with the granularity of 4-5 mm and fused magnesia powder with the fineness of 70-100 meshes are respectively as follows: 100kg, 650kg and 150kg of binding agent A brine is added, uniformly mixed, the adding amount of the binding agent A brine is 45kg, the MgCl 2 content 55wt% in the brine is mixed for 10 minutes in a V-type mixer;
C. Selection of additives
The zirconia powder is selected from fused zirconia powder, the content of ZrO 2 is 98wt%, the content of Al 2O3 is not higher than 1.5wt%, the content of SiO 2 is not higher than 1.3wt%, and the granularity is 120 meshes;
Zirconium boride powder: zrB 2 purity 98wt% and granularity 120 mesh;
Chromite powder: 46.09wt% of Cr 2O3, 0.861wt% of SiO 2, 15.39wt% of Al 2O3, 0.22wt% of CaO, 10.20wt% of MgO, 25.29wt% of FeO and 120 meshes of granularity;
Chromium oxide powder: purity 99wt%, granularity 120 mesh;
Light burned active magnesium oxide powder: mgO content 95.33wt%, ignition loss 2.35wt%, siO 2 content 0.56wt% and granularity 180 mesh;
D. additive for preparing materials
Premixing selected additives according to the following mass ratio:
Zirconia powder: zirconium boride powder: chromite powder: chromium oxide powder: light burned active magnesia powder=1.5:0.5:1: 2:2;
Wherein the weight of each raw material is as follows: 15kg of zirconia powder, 5kg of zirconium boride powder, 10kg of chromite powder, 20kg of chromium oxide powder and 20kg of light burned active magnesia powder, and mixing in a mixer for 30 minutes to obtain an additive;
E. Secondary mixed material and trapped material
Adding the prepared additive into a base material, uniformly mixing, gradually adding phosphoric acid as an adhesive in the mixing process, adjusting the concentration of the phosphoric acid to 75wt%, adding 10kg, and carrying out secondary mixing in a V-shaped mixer for 30 minutes; after mixing, ageing the mixture for 4 hours at room temperature to obtain the composite refractory material for the titanium-iron alloy vacuum smelting ramming furnace lining;
F. Ramming and baking furnace
Tamping a composite refractory material for a titanium-iron alloy vacuum smelting and tamping furnace lining to construct a furnace, wherein a machine is used for tamping in the tamping process;
the furnace lining after ramming needs to be subjected to a furnace baking process; the baking process is strictly carried out according to a baking curve, and the whole baking time is 8 hours; wherein:
drying the furnace for 3 hours at the temperature below 300 ℃ and mainly drying the adhering water in the furnace lining;
heating up the furnace at a speed of 5 ℃/min under 300-800 ℃ for 1 hour at 500 ℃ to remove crystal water in the furnace lining, and heating up to 800 ℃ for heat preservation;
G. Furnace lining sintering
The ferrotitanium smelting furnace lining adopts a first furnace sintering method, and the sintering raw material adopts pig iron; in order to prevent oxidation of the material caused by overlong sintering time of the first furnace, the sintering process is carried out under vacuum condition, the sintering temperature is 1700 ℃, and the heat preservation time is not less than 3 hours. The thickness of the top end of the ferrotitanium alloy smelting furnace lining is 70mm, the thickness of the bottom end of the ferrotitanium alloy smelting furnace lining is 90mm, the service life of a smelting period of ferrotitanium (the titanium content in ferrotitanium is 40-60 wt%) is 65 heats, and the service life of the smelting period is only 24 heats by using the electric smelting magnesia furnace lining under the same condition.
Example 3 application to high titanium (titanium content 60wt% to 75wt% in ferrotitanium)
A. processing of substrate material electro-fused magnesia
Taking electric smelting magnesia blocks with the magnesium oxide content of 97 grades, wherein the magnesium oxide content is 96.47wt%, the burning loss is 0.13wt%, the SiO 2 content is 1.26wt%, the CaO content is 1.12wt%, crushing the electric smelting magnesia blocks to be less than 10 mm, screening the crushed magnesia blocks into three granularities of 8-10 mm, 4-5 mm and 70-100 meshes;
B. One-time mixing
Mixing three types of fused magnesia with the granularity of 8-10 mm, 4-5 mm and 70-100 meshes according to the mass ratio of 3:14:2, wherein the weights of fused magnesia particles with the granularity of 8-10 mm, fused magnesia particles with the granularity of 4-5 mm and fused magnesia powder with the fineness of 70-100 meshes are respectively as follows: 150kg, 700kg and 100kg of binding agent A brine is added, uniformly mixed, the adding amount of the binding agent A brine is 38kg, the MgCl 2 content 55wt% in the brine is mixed for 10 minutes in a V-type mixer;
C. Selection of additives
The zirconia powder is selected from fused zirconia powder, the content of ZrO 2 is not less than 96wt%, the content of Al 2O3 is not more than 1.5wt%, the content of SiO 2 is not more than 1.3wt%, and the granularity is 200 meshes;
Zirconium boride powder: zrB 2 purity 98wt% and granularity 200 mesh;
Chromite powder: 46.09wt% of Cr 2O3, 0.861wt% of SiO 2, 15.39wt% of Al 2O3, 0.22wt% of CaO, 10.20 wt% of MgO, 25.29 wt% of FeO and 200 meshes of granularity;
chromium oxide powder: purity 99wt%, granularity 200 mesh;
light burned active magnesium oxide powder: mgO content 95.33wt%, ignition loss 2.35wt%, siO 2 content 0.56wt% and granularity 200 mesh;
D. Additive for preparing materials
Premixing selected additives according to the following mass ratio:
Zirconia powder: zirconium boride powder: chromite powder: chromium oxide powder: light burned active magnesia powder=2:0.8:1:3:2
Wherein the weight of each raw material is as follows: 20kg of zirconia powder, 8kg of zirconium boride powder, 10kg of chromite powder, 30kg of chromium oxide powder and 20kg of light burned active magnesia powder, and mixing in a mixer for 30 minutes to obtain an additive;
E. Secondary mixed material and trapped material
Adding the prepared additive into a matrix material, uniformly mixing, gradually adding phosphoric acid as an adhesive in the mixing process, adjusting the concentration of the phosphoric acid to 75wt%, adding 15kg, and carrying out secondary mixing in a V-shaped mixer for 30 minutes; after mixing, ageing the mixture for 5 hours at room temperature to obtain the composite refractory material for the titanium-iron alloy vacuum smelting ramming furnace lining;
F. Ramming and baking furnace
Tamping a composite refractory material for a titanium-iron alloy vacuum smelting and tamping furnace lining to construct a furnace, wherein a machine is used for tamping in the tamping process;
the furnace lining after ramming needs to be subjected to a furnace baking process; the baking process is strictly carried out according to a baking curve, and the whole baking time is 10 hours; wherein:
drying the furnace for 3.5 hours at the temperature below 300 ℃ and mainly drying the adhering water in the furnace lining;
Heating up the furnace at a speed of 3 ℃/min under 300-800 ℃ for 1 hour at 500 ℃ to remove crystal water in the furnace lining, and heating up to 800 ℃ for heat preservation;
G. Furnace lining sintering
The ferrotitanium smelting furnace lining adopts a first furnace sintering method, and the sintering raw material adopts pig iron; in order to prevent oxidation of the material caused by overlong sintering time of the first furnace, the sintering process is carried out under vacuum condition, the sintering temperature is 1600 ℃, and the heat preservation time is 5 hours. The thickness of the top end of the ferrotitanium alloy smelting furnace lining is 70mm, the thickness of the bottom end of the ferrotitanium alloy smelting furnace lining is 90mm, the service life of a smelting period of ferrotitanium (the titanium content in ferrotitanium is 60-75wt%) is 50 heats, the electric smelting magnesia furnace lining is used under the same condition, and the service life of the smelting period is only 17 heats.
Comparative example 1
Steps a-F are the same as in example 3;
G. Furnace lining sintering
The ferrotitanium smelting furnace lining adopts a first furnace sintering method, the sintering raw material adopts pig iron, the sintering process is carried out under vacuum condition, the sintering temperature is 1000 ℃, and the heat preservation time is 5 hours. The thickness of the top end of the ferrotitanium alloy smelting furnace lining is 70mm, the thickness of the bottom end of the ferrotitanium alloy smelting furnace lining is 90mm, and the service life of a ferrotitanium (the titanium content in ferrotitanium is 60-75wt%) smelting period is 17 times.
Comparative example 2
Steps a-F are the same as in example 3;
G. Furnace lining sintering
The ferrotitanium smelting furnace lining adopts a first furnace sintering method, the sintering raw material adopts pig iron, the sintering process is carried out under vacuum condition, the sintering temperature is 1200 ℃, and the heat preservation time is 5 hours. The thickness of the top end of the ferrotitanium alloy smelting furnace lining is 70mm, the thickness of the bottom end of the ferrotitanium alloy smelting furnace lining is 90mm, and the service life of a ferrotitanium (the titanium content in ferrotitanium is 60-75wt%) smelting period is 20 times.
Comparative example 3
Steps a-F are the same as in example 3;
G. Furnace lining sintering
The ferrotitanium smelting furnace lining adopts a first furnace sintering method, the sintering raw material adopts pig iron, the sintering process is carried out under vacuum condition, the sintering temperature is 1400 ℃, and the heat preservation time is 5 hours. The thickness of the top end of the ferrotitanium alloy smelting furnace lining is 70mm, the thickness of the bottom end of the ferrotitanium alloy smelting furnace lining is 90mm, and the service life of a ferrotitanium (the titanium content in ferrotitanium is 60-75wt%) smelting period is 25 times.
Comparative examples 1-3 are parallel tests of example 3 at different sintering temperatures during the sintering of the furnace lining, and the life of the furnace lining is significantly improved in the smelting furnace lining of example 3 of the invention.
Comparative example 4
Steps a-E are the same as in example 3;
F. Ramming and baking furnace
Tamping a composite refractory material for a titanium-iron alloy vacuum smelting and tamping furnace lining to construct a furnace, wherein a machine is used for tamping in the tamping process;
heating the furnace lining after ramming to 800 ℃, and baking for 10 hours;
Step G is the same as in example 3. The thickness of the top end of the ferrotitanium alloy smelting furnace lining is 70mm, the thickness of the bottom end of the ferrotitanium alloy smelting furnace lining is 90mm, the service life of a ferrotitanium (the titanium content in ferrotitanium is 60-75wt%) smelting period is less than 17 times, and the corrosion resistance is poor.
Comparative example 4 is a parallel test under the condition of directly baking without passing through the temperature rise curve of the invention, and the furnace lining of comparative example 4 has poor erosion resistance and short service life.
The above is only a specific embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A composite refractory material for a titanium-iron alloy vacuum smelting ramming furnace lining is characterized in that:
The composite refractory material takes fused magnesia as a base material, zirconia powder, zirconium boride powder, chromite powder, chromium oxide powder and light-burned active magnesia powder as additives, and comprises the following steps of:
A. processing the raw materials of the fused magnesia:
Crushing the fused magnesia lump materials, and screening the fused magnesia lump materials into fused magnesia granules with the granularity of 8-10 mm, fused magnesia granules with the granularity of 4-5 mm and fused magnesia powder with the fineness of 70-100 meshes;
B. Primary mixing:
According to the weight percentage, 1-3 parts of fused magnesia particles with the granularity of 8-10 mm mm, 14-15 parts of fused magnesia particles with the granularity of 4-5mm and 2-3 parts of fused magnesia powder with the granularity of 70-100 meshes are mixed, then binding agent A brine is added, the adding amount of the binding agent A brine is 4-6% of the total mass of the fused magnesia, and the mixture is mixed in a V-type mixer for 10 minutes;
C. Secondary mixing:
Adding zirconia powder, zirconium boride powder, chromium oxide powder, chromite powder and light-burned active magnesia powder on the basis of primary mixing, wherein the fineness of the zirconia powder, the zirconium boride powder, the chromium oxide powder and the chromite powder is 120-200 meshes; the fineness of the active magnesium oxide powder is 180-300 meshes, a secondary mixture is obtained after mixing, a bonding agent B phosphoric acid is added, the adding amount of the bonding agent B phosphoric acid accounts for 1-1.5% of the total mass of the secondary mixture, secondary mixing is carried out in a V-shaped mixer, and mixing is carried out for 30 minutes;
D. Trapping:
And after mixing, ageing the mixture for 3-5 hours at room temperature to obtain the composite refractory material for the titanium-iron alloy vacuum smelting ramming furnace lining.
2. The composite refractory material for a ferrotitanium vacuum melting ramming furnace lining according to claim 1, wherein: the MgCl 2 content in the bond A brine is not less than 55wt%.
3. The composite refractory material for a ferrotitanium vacuum melting ramming furnace lining according to claim 1, wherein: the mass concentration of the bond B phosphoric acid is not less than 65wt%.
4. The composite refractory material for a ferrotitanium vacuum melting ramming furnace lining according to claim 1, wherein: the MgO content in the fused magnesia is not less than 95wt%, the ignition loss is not more than 1.5wt% and the SiO 2 content is not more than 1.4wt%.
5. The composite refractory material for a ferrotitanium vacuum melting ramming furnace lining according to claim 1, wherein: the zirconia powder is fused zirconia, the content of ZrO 2 is not less than 96wt%, the content of Al 2O3 is not more than 1.5wt% and the content of SiO 2 is not more than 1.3wt%.
6. The composite refractory material for a ferrotitanium vacuum melting ramming furnace lining according to claim 1, wherein: the content of ZrB 2 in the zirconium boride is not less than 98wt%.
7. The composite refractory material for a ferrotitanium vacuum melting ramming furnace lining according to claim 1, wherein: the content of Cr 2O3 in the chromite powder is not less than 45wt percent, and the content of SiO 2 is not more than 1wt percent; the chromium oxide powder contains Cr 2O3 of not less than 99wt%.
8. The composite refractory material for a ferrotitanium vacuum melting ramming furnace lining according to claim 1, wherein: the MgO content in the light-burned active magnesium oxide is not less than 95 weight percent, the ignition loss is less than 2.5 weight percent, and the SiO 2 content is not more than 1 weight percent.
9. Use of a composite refractory material according to claim 1 in a lining for the vacuum melting and ramming of ferrotitanium.
10. The use of a composite refractory material according to claim 9 in a ferrotitanium vacuum melting ramming lining, characterized in that: ramming a furnace for ramming a composite refractory material for a furnace lining of ferrotitanium vacuum smelting and ramming according to any one of claims 1 to 8, and baking the furnace lining after ramming for 8 to 10 hours, wherein the whole baking time is 3 to 5 hours below 300 ℃ when baking; heating the furnace at the speed of 3 ℃/min-5 ℃/min at 300 ℃ -800 ℃, preserving heat for 1 hour at 500 ℃, and preserving heat for not less than 2 hours at 800 ℃; and then sintering under vacuum condition, wherein the sintering raw material adopts pig iron, the sintering temperature is 1600-1700 ℃, the sintering time is 3-5 hours, and the sintering is completed, so that the furnace lining for vacuum smelting and ramming of ferrotitanium alloy is obtained.
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