CN113003600A - Preparation method of rare earth oxide - Google Patents
Preparation method of rare earth oxide Download PDFInfo
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- CN113003600A CN113003600A CN202110255839.XA CN202110255839A CN113003600A CN 113003600 A CN113003600 A CN 113003600A CN 202110255839 A CN202110255839 A CN 202110255839A CN 113003600 A CN113003600 A CN 113003600A
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- 229910001404 rare earth metal oxide Inorganic materials 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 44
- 239000007789 gas Substances 0.000 claims abstract description 41
- -1 rare earth salt Chemical class 0.000 claims abstract description 32
- 239000003546 flue gas Substances 0.000 claims abstract description 20
- 239000002737 fuel gas Substances 0.000 claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 26
- 238000004321 preservation Methods 0.000 claims description 16
- 239000003345 natural gas Substances 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- QCZFMLDHLOYOQJ-UHFFFAOYSA-H samarium(3+);tricarbonate Chemical compound [Sm+3].[Sm+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O QCZFMLDHLOYOQJ-UHFFFAOYSA-H 0.000 claims description 7
- UTWHRPIUNFLOBE-UHFFFAOYSA-H neodymium(3+);tricarbonate Chemical compound [Nd+3].[Nd+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O UTWHRPIUNFLOBE-UHFFFAOYSA-H 0.000 claims description 6
- 229910017569 La2(CO3)3 Inorganic materials 0.000 claims description 5
- 239000003034 coal gas Substances 0.000 claims description 5
- NZPIUJUFIFZSPW-UHFFFAOYSA-H lanthanum carbonate Chemical compound [La+3].[La+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O NZPIUJUFIFZSPW-UHFFFAOYSA-H 0.000 claims description 5
- 229960001633 lanthanum carbonate Drugs 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- MBULCFMSBDQQQT-UHFFFAOYSA-N (3-carboxy-2-hydroxypropyl)-trimethylazanium;2,4-dioxo-1h-pyrimidine-6-carboxylate Chemical compound C[N+](C)(C)CC(O)CC(O)=O.[O-]C(=O)C1=CC(=O)NC(=O)N1 MBULCFMSBDQQQT-UHFFFAOYSA-N 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- OXHNIMPTBAKYRS-UHFFFAOYSA-H lanthanum(3+);oxalate Chemical compound [La+3].[La+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O OXHNIMPTBAKYRS-UHFFFAOYSA-H 0.000 claims description 3
- UHTYDNCIXKPJDA-UHFFFAOYSA-H oxalate;praseodymium(3+) Chemical compound [Pr+3].[Pr+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O UHTYDNCIXKPJDA-UHFFFAOYSA-H 0.000 claims description 3
- DABIZUXUJGHLMW-UHFFFAOYSA-H oxalate;samarium(3+) Chemical compound [Sm+3].[Sm+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O DABIZUXUJGHLMW-UHFFFAOYSA-H 0.000 claims description 3
- XIRHLBQGEYXJKG-UHFFFAOYSA-H praseodymium(3+);tricarbonate Chemical compound [Pr+3].[Pr+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O XIRHLBQGEYXJKG-UHFFFAOYSA-H 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 abstract description 12
- 238000006722 reduction reaction Methods 0.000 abstract description 6
- 238000006479 redox reaction Methods 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 13
- 240000008397 Ganoderma lucidum Species 0.000 description 6
- 235000001637 Ganoderma lucidum Nutrition 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/10—Preparation or treatment, e.g. separation or purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/224—Oxides or hydroxides of lanthanides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/224—Oxides or hydroxides of lanthanides
- C01F17/229—Lanthanum oxides or hydroxides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of rare earth smelting, and particularly relates to a preparation method of rare earth oxide. The invention provides a preparation method of rare earth oxide, which comprises the following steps: in the combustion-supporting gas and fuel gas, the rare earth salt is continuously roasted to obtain rare earth oxide; the use amount of the combustion-supporting gas and the fuel gas is based on the volume concentration of CO in the discharged flue gas generated by continuous roasting of 50-75 ppm. The preparation method provided by the invention controls the consumption of combustion-supporting gas and fuel gas in the preparation process, and CO in the system can be fully mixed with NO generated by the combustion-supporting gas in the continuous roasting processxOxidation-reduction reaction is carried out to react NOxDirect reduction to N2Effectively reduce NO in the smokexThe amount of gas discharged.
Description
Technical Field
The invention belongs to the technical field of rare earth smelting, and particularly relates to a preparation method of rare earth oxide.
Background
In the rare earth industry, air is used as combustion-supporting gas for roasting rare earth oxides, a large amount of nitrogen in high-temperature air reacts with oxygen to generate partial nitric oxide, and direct emission causes pollution to the environment to a certain extent.
For reducing NO in industrial productionxThe gas is discharged by liquid absorption, solid adsorption, reduction, biological method, etc. Wherein the liquid absorption method is by using NOxThe different components of the gas have different solubilities in different absorbents or react with the absorbents to purify NO in the exhaust gasxThe method has the advantages of simple process, low investment and the like, but has low efficiency and poor purification effect. The solid adsorption method is to use porous solid adsorbent to adsorb NOxPhysical adsorption is carried out, but the adsorption efficiency is low, and the equipment cost and the labor cost are high. The reduction method is to use different kinds of catalysts to react NOxThe waste gas is reduced into pollution-free nitrogen. The biological method is to utilize the metabolic process of microorganism (denitrifying bacteria) to remove NOxConversion to harmless N2The method has the advantages of simple equipment, low cost, good safety and the like, but the prior art is not mature.
The above schemes are all to treat the generated nitrogen oxides, but NO reduction of NO in the roasting process of rare earth oxides is found in the prior artxReport of gas discharge scheme.
Disclosure of Invention
In view of the above, the present invention provides a method for preparing rare earth oxide, which effectively reduces NOxEmission of gas, NOxLess than 50ppm, meets the national emission standard, has little pollution and is environment-friendly.
The invention provides a preparation method of rare earth oxide, which comprises the following steps:
in the combustion-supporting gas and fuel gas, the rare earth salt is continuously roasted to obtain rare earth oxide;
the use amount of the combustion-supporting gas and the fuel gas is based on the volume concentration of CO in the discharged flue gas generated by continuous roasting of 50-75 ppm.
Preferably, the continuous roasting produces exhaust fumesCO and NOxThe volume concentration ratio of (1.2-10): 1.
preferably, the combustion-supporting gas comprises a mixed gas of air and oxygen or air.
Preferably, the gas comprises natural gas or coal gas.
Preferably, the rare earth salt comprises a rare earth carbonate and/or a rare earth oxalate.
Preferably, the rare earth carbonate includes one or more of lanthanum carbonate, praseodymium carbonate, neodymium carbonate and samarium carbonate.
Preferably, the rare earth oxalate comprises one or more of lanthanum oxalate, praseodymium oxalate, neodymium oxalate and samarium oxalate.
Preferably, the feeding frequency of the continuous roasting is 25-35 Hz.
Preferably, the temperature of the continuous roasting is 950-1100 ℃; the heat preservation time is 0.5-10 h.
Preferably, the continuous firing is carried out in a roller kiln or a rotary kiln.
The invention provides a preparation method of rare earth oxide, which comprises the following steps: in the combustion-supporting gas and fuel gas, the rare earth salt is continuously roasted to obtain rare earth oxide; the use amount of the combustion-supporting gas and the fuel gas is based on the volume concentration of CO in the discharged flue gas generated by continuous roasting of 50-75 ppm. The preparation method provided by the invention controls the consumption of combustion-supporting gas and fuel gas in the preparation process, and sufficient CO exists in the roasting system in the continuous roasting process, and the CO can fully react with NO generated by the combustion-supporting gasxOxidation-reduction reaction is carried out to react NOxDirect reduction to N2Effectively reduce NO in the smokexThe amount of gas discharged. The results of the examples show that the preparation method provided by the invention discharges NO in the flue gas in the roasting process for preparing rare earth oxidexThe volume concentration of the (D) is not more than 11.2ppm and is far less than the requirement that the national emission standard is less than 50ppm, and the (D) is low in pollution and environment-friendly.
Detailed Description
The invention provides a preparation method of rare earth oxide, which comprises the following steps:
in the combustion-supporting gas and fuel gas, the rare earth salt is continuously roasted to obtain rare earth oxide;
the use amount of the combustion-supporting gas and the fuel gas is based on the volume concentration of CO in the discharged flue gas generated by continuous roasting of 50-75 ppm.
In the present invention, the starting materials are all commercially available products well known to those skilled in the art, unless otherwise specified.
In the present invention, the combustion-supporting gas preferably comprises a mixed gas of air and oxygen or air, more preferably air, and when the combustion-supporting gas comprises a mixed gas of air and oxygen, the present invention has no particular requirement on the volume ligand of air and oxygen. In the invention, the combustion-supporting gas is combusted with fuel gas to provide a high-temperature environment required by continuous roasting of rare earth salt.
In the invention, the combustion-supporting gas contains N2In the course of high-temperature calcination, N2Reacts with oxygen to produce NOxAnd environmental pollution is easily caused.
In the invention, the fuel gas preferably comprises natural gas or coal gas, more preferably comprises natural gas, and in the invention, the combustion-supporting gas and the fuel gas are used in amounts such that the volume concentration of CO in the discharged flue gas generated by continuous roasting is 50-75 ppm, preferably 55-70 ppm, more preferably 60-65 ppm; in the invention, when the fuel gas is preferably natural gas, CO is obtained by incomplete oxidation of combustion-supporting gas and methane in the natural gas; when the gas is preferably coal gas, CO is the main constituent of the coal gas.
The use amounts of the combustion-supporting gas and the fuel gas are based on the fact that the volume concentration of CO in the discharged flue gas generated by continuous roasting is 50-75 ppm, the concentration of CO in a roasting system is controlled by controlling the use amounts of the combustion-supporting gas and the fuel gas, and sufficient CO and sufficient NO exist in the roasting systemxReaction, effectively reducing NO in the flue gasxThe content of (a).
In the invention, CO and NO in the exhaust flue gas generated by continuous roastingxThe volume concentration ratio of (1.2-10): 1, more preferably (1.5 to 8): 1,most preferably (3.5-6): 1; in the invention, the volume concentration of CO and NO in the exhaust flue gas generated by continuous roastingxThe detection method of the volume concentration is preferably to detect through an online monitoring system, and the online monitoring system preferably meets the requirement of' HJ 75 fixed pollution source flue gas (SO)2、NOxParticulate matter) emission continuous monitoring technical specification.
In the present invention, the rare earth salt preferably includes a rare earth carbonate and/or a rare earth oxalate, and the rare earth carbonate preferably includes one or more of lanthanum carbonate, praseodymium carbonate, neodymium carbonate and samarium carbonate, and in the present invention, when the rare earth carbonate includes two or more of the above specific substances, there is no special requirement on the mass ratio of the specific substances; in the invention, the rare earth oxalate preferably comprises one or more of lanthanum oxalate, praseodymium oxalate, neodymium oxalate and samarium oxalate, and in the invention, when the rare earth oxalate comprises more than two of the specific substances, the invention has no special requirement on the mass ratio of the specific substances; in the present invention, when the rare earth salt includes a rare earth carbonate and a rare earth oxalate, the rare earth carbonate and the rare earth oxalate are salts of the same rare earth metal.
In the embodiment of the invention, the rare earth salt is filled in the saggars for continuous roasting, and the mass of the rare earth salt in each saggar is preferably 4.5-6.0 kg, and more preferably 5.0-5.5 kg. In a specific embodiment of the invention, the rare earth salt is selected from Zibo Ganzhi rare earth high tech. Co.
In the invention, the feeding frequency of the continuous roasting is preferably 25-35 Hz, more preferably 30Hz, and in the invention, the feeding mode is preferably that the rare earth salt is filled in a sagger for feeding.
In the invention, the continuous roasting temperature is preferably 950-1100 ℃, and more preferably 1000-1090 ℃; the heat preservation time of the continuous roasting is preferably 0.5-10 h, more preferably 2-8 h, and most preferably 4-6.5 h; in the invention, the heating rate of heating to the heat preservation temperature is preferably 3-10 ℃/min, and more preferably 4-6 ℃/min.
In the present invention, the continuous firing is preferably performed in a roller kiln or a converter, more preferably in a roller kiln.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Loading 5.5kg of lanthanum carbonate produced by Zibo Bao ganoderma lucidum rare earth into saggars, feeding into a roller kiln for continuous roasting, controlling the feeding frequency to be 30Hz, the roasting temperature to be 1060 ℃, the heating rate of heating to the heat preservation temperature to be 10 ℃/min, and the heat preservation time to be 6 h. By adjusting air and natural gas, the volume concentration of CO in the discharged flue gas is controlled to be 50ppm, and NO is detected on linexThe volume concentration of (3) was 9.6 ppm.
Comparative example 1
Loading 5.5kg of lanthanum carbonate produced by Zibo Bao ganoderma lucidum rare earth into saggars, feeding into a roller kiln for continuous roasting, controlling the feeding frequency to be 30Hz, the roasting temperature to be 1060 ℃, the heating rate of heating to the heat preservation temperature to be 10 ℃/min, and the heat preservation time to be 6 h. By adjusting air and natural gas, the volume concentration of CO in the discharged flue gas is controlled to be 10ppm, and NO is detected on linexThe volume concentration of (D) was 51.6 ppm.
Example 2
Taking neodymium carbonate produced by Zibo Bao ganoderma lucidum rare earth, loading the neodymium carbonate into saggars according to 5.0 kg of the saggars, feeding the saggars into a roller kiln for continuous roasting, controlling the feeding frequency to be 25Hz, the roasting temperature to be 1080 ℃, the heating rate of heating to the heat preservation temperature to be 6 ℃/min, and the heat preservation time to be 6.5 h. By adjusting air and natural gas, the volume concentration of CO in the discharged flue gas is controlled to be 75ppm, and NO is detected on linexThe volume concentration of (D) was 11.2 ppm.
Comparative example 2
Loading neodymium carbonate produced from Zibo Bao Ganoderma lucidum rare earth into saggars according to 5.0 kg per saggar, continuously roasting in a roller kiln at a feeding frequency of 25Hz and a roasting temperature of 1080 deg.CThe heating rate when the temperature is increased to the heat preservation temperature is 6 ℃/min, and the heat preservation time is 6.5 h. Controlling the volume concentration of CO in the discharged flue gas to be 5ppm by adjusting air and natural gas, and detecting NO on linexThe volume concentration of (D) was 65.3 ppm.
Example 3
Taking samarium carbonate produced by Zibo Bao ganoderma lucidum rare earth, putting 5.5kg of the samarium carbonate into saggars per saggar, feeding the saggars into a roller kiln for continuous roasting, controlling the feeding frequency to be 38Hz, the roasting temperature to be 1050 ℃, the heating rate of heating to the heat preservation temperature to be 3 ℃/min, and the heat preservation time to be 4 h. Controlling the volume concentration of CO in the discharged flue gas to be 70ppm by adjusting air and natural gas, and detecting NO on linexThe volume concentration of (D) is 10.5 ppm.
Comparative example 3
Taking samarium carbonate produced by Zibo Bao ganoderma lucidum rare earth, putting 5.5kg of the samarium carbonate into saggars per saggar, feeding the saggars into a roller kiln for continuous roasting, controlling the feeding frequency to be 38Hz, the roasting temperature to be 1050 ℃, the heating rate of heating to the heat preservation temperature to be 3 ℃/min, and the heat preservation time to be 4 h. Controlling the volume concentration of CO in the discharged flue gas to be 6ppm by adjusting air and natural gas, and detecting NO on linexThe volume concentration of (3) was 70.6 ppm.
CO and NO in the exhaust flue gas of the preparation method of the rare earth oxide provided in the embodiment 1-3 and the comparative example 1-3xThe volume concentration of the catalyst is shown in Table 1, and compared with comparative examples 1 to 3, the catalyst of examples 1 to 3 of the present invention can control the amount of the combustion-supporting gas and the amount of the fuel gas in the preparation process, so that CO in the system can be sufficiently mixed with NO generated from the combustion-supporting gas in the continuous roasting processxOxidation-reduction reaction is carried out to react NOxDirect reduction to N2Effectively reduce NO in the smokexEmission of gases, NO in exhaust fumesxThe volume concentration of the (D) is not more than 11.2ppm and is far less than the requirement that the national emission standard is less than 50ppm, and the (D) is low in pollution and environment-friendly.
Table 1 methods for preparing rare earth oxides provided in examples 1 to 3 and comparative examples 1 to 3 of the present inventionxVolume concentration of
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (10)
1. The preparation method of the rare earth oxide is characterized by comprising the following steps:
in the combustion-supporting gas and fuel gas, the rare earth salt is continuously roasted to obtain rare earth oxide;
the use amount of the combustion-supporting gas and the fuel gas is based on the volume concentration of CO in the discharged flue gas generated by continuous roasting of 50-75 ppm.
2. The method according to claim 1, wherein the continuous roasting produces CO and NO in the exhaust flue gasxThe volume concentration ratio of (1.2-10): 1.
3. the production method according to claim 1, wherein the combustion-supporting gas comprises a mixed gas of air and oxygen or air.
4. The method of claim 1, wherein the fuel gas comprises natural gas or coal gas.
5. The method of claim 1, wherein the rare earth salt comprises a rare earth carbonate and/or a rare earth oxalate.
6. The method according to claim 5, wherein the rare earth carbonate includes one or more of lanthanum carbonate, praseodymium carbonate, neodymium carbonate, and samarium carbonate.
7. The method according to claim 5, wherein the rare earth oxalate includes one or more of lanthanum oxalate, praseodymium oxalate, neodymium oxalate and samarium oxalate.
8. The preparation method according to claim 1, wherein the feeding frequency of the continuous roasting is 25 to 35 Hz.
9. The preparation method of claim 1, wherein the temperature of the continuous roasting is 950-1100 ℃; the heat preservation time is 0.5-10 h.
10. The method according to claim 1 or 9, wherein the continuous firing is performed in a roller kiln or a converter.
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| CN115105949A (en) * | 2022-07-08 | 2022-09-27 | 潮州市索力德机电设备有限公司 | Method for reducing NOx emission of ceramic gas tunnel kiln |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115105949A (en) * | 2022-07-08 | 2022-09-27 | 潮州市索力德机电设备有限公司 | Method for reducing NOx emission of ceramic gas tunnel kiln |
| CN115105949B (en) * | 2022-07-08 | 2023-08-11 | 潮州市索力德机电设备有限公司 | Method for reducing NOx discharged by ceramic gas tunnel kiln |
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