CN116874290A - Chromium corundum castable containing calcium hexaluminate for dangerous waste incineration device - Google Patents
Chromium corundum castable containing calcium hexaluminate for dangerous waste incineration device Download PDFInfo
- Publication number
- CN116874290A CN116874290A CN202310993758.9A CN202310993758A CN116874290A CN 116874290 A CN116874290 A CN 116874290A CN 202310993758 A CN202310993758 A CN 202310993758A CN 116874290 A CN116874290 A CN 116874290A
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- China
- Prior art keywords
- equal
- less
- waste incineration
- calcium hexaluminate
- incineration device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000011575 calcium Substances 0.000 title claims abstract description 31
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 31
- 229910052593 corundum Inorganic materials 0.000 title claims abstract description 31
- 239000010431 corundum Substances 0.000 title claims abstract description 31
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000004056 waste incineration Methods 0.000 title claims abstract description 17
- 239000011651 chromium Substances 0.000 title claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 13
- 239000002920 hazardous waste Substances 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 7
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 6
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract 2
- 150000004645 aluminates Chemical class 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 abstract description 7
- 230000035939 shock Effects 0.000 abstract description 7
- 239000002253 acid Substances 0.000 abstract description 3
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 150000001339 alkali metal compounds Chemical class 0.000 description 2
- QQHSIRTYSFLSRM-UHFFFAOYSA-N alumanylidynechromium Chemical compound [Al].[Cr] QQHSIRTYSFLSRM-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000009272 plasma gasification Methods 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000005837 radical ions Chemical class 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
- C04B35/105—Refractories from grain sized mixtures containing chromium oxide or chrome ore
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3241—Chromium oxides, chromates, or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The invention belongs to a refractory material technology for a hazardous waste incineration device, and relates to a chromium corundum castable containing calcium hexaluminate for the hazardous waste incineration device. The related raw materials of the chrome corundum castable material containing the calcium hexaluminate comprise the following components in percentage by mass: 10-50% of calcium hexaaluminate, 40-80% of chrome corundum and active alpha-Al 2 O 3 3-8% of micro powder, 1-5% of chromium oxide green, 3-10% of pure calcium aluminate cement and 0.1-0.2% of water reducer, wherein the water reducer is externally added. The chromium corundum castable containing calcium hexaluminate prepared by the invention has the characteristics of excellent mechanical property, good thermal shock resistance, low heat conductivity, good acid and alkaline gas erosion resistance at high temperature, good volume stability, long service life and the like, and is an environment-friendly refractory material with excellent performance.
Description
Technical Field
The invention belongs to a refractory material technology for a hazardous waste incineration device, and relates to a chromium corundum castable containing calcium hexaluminate for the hazardous waste incineration device.
Background
With the high-speed development of the economy of China, the quantity of urban industrial dangerous wastes is increased sharply, and the improper treatment of the wastes can seriously affect the environment and endanger the survival of people; at present, the treatment of industrial hazardous waste is mainly carried out by adopting an incineration method for harmless treatment; the waste contains a large amount of acidic and alkaline components, a large amount of corrosive gas such as chloridion, fluoride ion and other acid radical ions, sodium salt, potassium salt and other alkali metal compound steam is generated in the high-temperature incinerator, and a large amount of corrosive components are easy to chemically react with furnace lining materials at high temperature, so that the lining is corroded and damaged, and the production efficiency is influenced; at present, the dangerous waste incineration device mostly adopts chrome corundum brick/chrome corundum castable as a working lining; but the thermal shock resistance of the chrome corundum refractory material is extremely poor, the chrome corundum refractory material is easy to peel off and damage under the condition of frequent temperature fluctuation, and the service life of the chrome corundum refractory material is reduced; the chromium corundum material has higher energy loss in the operation process of the incineration device due to higher density and higher corresponding heat conductivity coefficient, and in addition, the chromium-containing refractory material is easy to react to generate strong carcinogenic hexavalent chromium substances in the use process;
the calcium hexaluminate is used as a novel synthetic refractory raw material, has stable high-temperature chemical property, can stably exist in alkaline, reducing and other environments, is not suitable for hydration, and has a flaky crystal structure which reduces heat conduction and improves the thermal shock resistance of the material; the patent of 'a calcium hexaluminate castable for a plasma gasification furnace and a preparation method thereof' (CN 110903096A) and 'a fast alkali-resistant compression-resistant castable' (CN 105218115A) respectively disclose two preparation methods of pure calcium hexaluminate castable, the patent of 'a spinel-calcium hexaluminate castable for a coal catalytic gasification furnace and a preparation method thereof' (CN 106588056A) discloses a preparation method of a spinel-calcium hexaluminate castable suitable for alkaline environment, and the three castable are mainly used for dangerous waste disposal furnace and coal gasifier devices of a plasma melting furnace by utilizing the characteristics of excellent alkali resistance, low heat conduction performance, high strength and the like of the calcium hexaluminate. The patent 'corundum-calcium hexaluminate based on aluminum chromium slag and a preparation method thereof' (CN 108484184A) discloses a method for preparing corundum-calcium hexaluminate raw materials by adopting aluminum chromium slag, which belongs to a synthetic preparation method of composite raw materials, and the side surface of the method proves that chrome corundum can be organically composited with calcium hexaluminate; however, the above calcium hexaluminate-containing castable products have insufficient acid-base complex environment corrosion resistance and cannot be directly used in complex hazardous waste incineration devices.
Disclosure of Invention
The invention provides a chromium corundum castable containing calcium hexaluminate for a hazardous waste incineration device, which is characterized in that a calcium hexaluminate raw material is introduced into the chromium corundum castable, so that the thermal shock resistance of the castable is improved, the heat conductivity coefficient of the castable is reduced, and the service life of an incinerator lining is prolonged.
The invention adopts the following technical scheme for accomplishing the purposes:
the chromium corundum castable containing calcium hexaluminate is directly used as a working layer to be poured into an incinerator; the castable comprises the following raw materials in percentage by mass:
the calcium hexaluminate d is less than or equal to 5mm and is 10-50%;
chrome corundum d is less than or equal to 5mm 40-80%;
active alpha-Al 2 O 3 Micropowder D 50 ≤2μm 3-8%；
Chromium oxide green d is less than or equal to 45 mu m 1-5%;
aluminate cement d is less than or equal to 45 mu m and 3-10%;
0.1-0.2% of water reducer;
wherein the water reducing agent is externally added.
The chrome corundum is Cr 2 O 3 The content is more than or equal to 13 percent, al 2 O 3 The content is more than or equal to 82 percent, cr 2 O 3 +Al 2 O 3 The content is more than or equal to 98 percent, and the granularity is 5-0.045 mm.
The calcium hexaaluminate is Al 2 O 3 The content is more than or equal to 91wt percent, the CaO content is more than or equal to 8wt percent, and the CaO.6Al 2 O 3 The mineral phase composition of the alloy is more than or equal to 95 weight percent, and the volume density is more than or equal to 3.0g/cm 3 Segment sand with granularity less than or equal to 5 mm.
The active alpha-Al 2 O 3 The micropowder is Al 2 O 3 Calcined alumina micropowder with content more than or equal to 99 percent and granularity D50 less than or equal to 2um.
The invention provides a chromium corundum castable containing calcium hexaluminate for a hazardous waste incineration device, which adopts chromium corundum as a matrix material; the chrome corundum material has high strength and excellent erosion resistance, but has poor thermal shock resistance, and is easy to react with alkali metal compounds to generate low-melting-point chromate compounds, and the material has strong carcinogenicity.
In summary, the castable has the following beneficial effects:
1. the thermal shock stability is good, and the probability of peeling and damage of the thermal shock is reduced;
2. the high-temperature lining has good acid resistance and alkaline gas corrosion resistance and good volume stability, and effectively prolongs the service life of the lining;
3. the heat conductivity coefficient is low, the heat insulation performance of the lining is improved, and the energy is saved;
Detailed Description
The examples of the invention are given below, without constituting any limitation thereof; various performance indicators mentioned in the embodiments are detected according to GB/T4513.6-2017, YB/T4018-2008 and GB/T37796-2019.
Examples
Weighing the following components in percentage by mass:
calcium hexaluminate d is less than or equal to 5mm 50%;
chrome corundum d is less than or equal to 5mm 35%;
active alpha-Al 2 O 3 Micropowder D 50 ≤2μm 3%；
Chromium oxide green d is less than or equal to 45 mu m 5%;
aluminate cement d is less than or equal to 45 mu m and 7%;
0.1% of water reducer;
wherein, the aluminate cement is selected from Secar71 cement, and the water reducer is selected from polycarboxylate (FS-10); the components are uniformly mixed in a forced mixer, and water is added to be uniformly stirred, so that the castable for the hazardous waste incineration device can be obtained.
Examples
Weighing the following components in percentage by mass:
the calcium hexaluminate d is less than or equal to 5mm 10%;
chrome corundum d is less than or equal to 5mm 79%;
active alpha-Al 2 O 3 Micropowder D 50 ≤2μm 5%；
Chromium oxide green d is less than or equal to 45 mu m 1%;
aluminate cement d is less than or equal to 45 mu m and is 5 percent;
0.1% of water reducer;
wherein, the aluminate cement is selected from Secar71 cement, and the water reducer is selected from polycarboxylate (FS-10); the components are uniformly mixed in a forced mixer, and water is added to be uniformly stirred, so that the castable for the hazardous waste incineration device can be obtained.
Examples
Weighing the following components in percentage by mass:
the calcium hexaluminate d is less than or equal to 5mm 25%;
chrome corundum d is less than or equal to 5mm 54%;
active alpha-Al 2 O 3 Micropowder D 50 ≤2μm 8%；
Chromium oxide green d is less than or equal to 45 mu m 3%;
aluminate cement d is less than or equal to 45 mu m and 10 percent;
0.2% of water reducer;
wherein, the aluminate cement is the Wick 68 cement, and the water reducing agent is the phosphate system (sodium tripolyphosphate); the components are uniformly mixed in a forced mixer, and water is added to be uniformly stirred, so that the castable for the hazardous waste incineration device can be obtained.
TABLE 1 Performance index of the castable of example 1-example 3
Claims (4)
1. The castables of the chromium corundum of the calcium hexaluminate for the dangerous waste incineration device are directly cast into an incinerator as a working layer; the castable comprises the following raw materials in percentage by mass:
the calcium hexaluminate d is less than or equal to 5mm and is 10-50%;
chrome corundum d is less than or equal to 5mm 40-80%;
active alpha-Al 2 O 3 Micropowder D 50 ≤2μm 3-8%；
Aluminate cement d is less than or equal to 45 mu m and 3-10%;
chromium oxide green d is less than or equal to 45 mu m 1-5%;
0.1-0.2% of water reducer;
wherein the water reducing agent is externally added.
2. A chrome corundum castable material containing calcium hexaluminate for a hazardous waste incineration device as claimed in claim 1, wherein: the chrome corundum is Cr 2 O 3 The content is more than or equal to 13 percent, al 2 O 3 The content is more than or equal to 82 percent, cr 2 O 3 +Al 2 O 3 The content is more than or equal to 98 percent, and the granularity is less than or equal to 5 mm.
3. A chrome corundum castable material containing calcium hexaluminate for a hazardous waste incineration device as claimed in claim 1, wherein: the calcium hexaaluminate is Al 2 O 3 The content is more than or equal to 91wt percent, the CaO content is more than or equal to 8wt percent, and the CaO.6Al 2 O 3 The mineral phase composition of the alloy is more than or equal to 95 weight percent, and the volume density is more than or equal to 3.0g/cm 3 Segment sand with granularity less than or equal to 5 mm.
4. The calcium dialuminate-containing chrome corundum castable material for dangerous waste incineration device as claimed in claim 1, wherein the active alpha-Al is characterized in that 2 O 3 The micropowder is Al 2 O 3 Calcined alumina micropowder with content more than or equal to 99 percent and granularity D50 less than or equal to 2um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310993758.9A CN116874290A (en) | 2023-08-09 | 2023-08-09 | Chromium corundum castable containing calcium hexaluminate for dangerous waste incineration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310993758.9A CN116874290A (en) | 2023-08-09 | 2023-08-09 | Chromium corundum castable containing calcium hexaluminate for dangerous waste incineration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116874290A true CN116874290A (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310993758.9A Pending CN116874290A (en) | 2023-08-09 | 2023-08-09 | Chromium corundum castable containing calcium hexaluminate for dangerous waste incineration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116874290A (en) |
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2023
- 2023-08-09 CN CN202310993758.9A patent/CN116874290A/en active Pending
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