CN113981208A - Roasting method of secondary slag - Google Patents
Roasting method of secondary slag Download PDFInfo
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- CN113981208A CN113981208A CN202111193053.6A CN202111193053A CN113981208A CN 113981208 A CN113981208 A CN 113981208A CN 202111193053 A CN202111193053 A CN 202111193053A CN 113981208 A CN113981208 A CN 113981208A
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- slag
- temperature
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- vanadium
- roasting
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- 239000002893 slag Substances 0.000 title claims abstract description 178
- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 82
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 82
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 72
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 26
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 abstract description 17
- 239000002699 waste material Substances 0.000 abstract description 5
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 25
- 229910001948 sodium oxide Inorganic materials 0.000 description 25
- 238000005245 sintering Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000002386 leaching Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- CMZUMMUJMWNLFH-UHFFFAOYSA-N sodium metavanadate Chemical compound [Na+].[O-][V](=O)=O CMZUMMUJMWNLFH-UHFFFAOYSA-N 0.000 description 2
- 229910000166 zirconium phosphate Inorganic materials 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- VWBLQUSTSLXQON-UHFFFAOYSA-N N.[V+5] Chemical compound N.[V+5] VWBLQUSTSLXQON-UHFFFAOYSA-N 0.000 description 1
- QUEDYRXQWSDKKG-UHFFFAOYSA-M [O-2].[O-2].[V+5].[OH-] Chemical compound [O-2].[O-2].[V+5].[OH-] QUEDYRXQWSDKKG-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000003682 vanadium compounds Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/20—Obtaining niobium, tantalum or vanadium
- C22B34/22—Obtaining vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of vanadium slag roasting, in particular to a roasting method of secondary slag, which comprises the following steps: uniformly mixing the secondary slag and the fine slag to obtain mixed slag; adding sodium carbonate into the mixed slag, and uniformly mixing to obtain a mixed material; and sequentially carrying out preheating treatment, high-temperature treatment and cooling treatment on the mixed material to obtain clinker. According to the roasting method of the secondary slag, provided by the invention, the secondary slag and the fine slag are mixed and then roasted, so that the total vanadium content of the mixed slag can be increased, and the optimal temperature ranges of preheating treatment, high-temperature treatment and cooling treatment are determined according to the vanadium content in the mixed slag, and the conversion rate of clinker of the secondary slag can be increased by 1.5-3%, so that the total vanadium content of the waste slag is reduced, the vanadium yield of a system is increased, and the roasting cost of the secondary slag is reduced.
Description
Technical Field
The invention relates to the technical field of vanadium slag roasting, in particular to a roasting method of secondary slag.
Background
In the sodium salt roasting vanadium extraction process, refined vanadium slag and sodium carbonate are roasted to form roasting clinker, and then water leaching and leaching solution impurity removal are carried out to carry out acid ammonium salt vanadium precipitation to generate ammonium polyvanadate, and the ammonium polyvanadate is calcined or reduced to generate vanadium pentoxide or vanadium trioxide. Sodium oxide roasting is one of the most critical processes in the sodium roasting vanadium extraction process, and sodium oxide roasting is to react low-valent vanadium in refined vanadium slag with sodium carbonate and oxygen in air at high temperature to generate roasted clinker containing soluble vanadium compounds (pentavalent or tetravalent vanadium).
Crushing and ball-milling the refined vanadium slag to obtain primary slag, roasting the primary slag, wherein the leached solid residue is called secondary residue, roasting the secondary slag again, and leaching to obtain waste slag, wherein the vanadium content of the waste slag is an important index for reflecting the roasting effect and the vanadium yield of the system. However, if the secondary slag is directly roasted, impurities in the secondary slag easily form a sintering layer on the surface of the secondary slag at a high temperature, so that oxygen diffusion is hindered, and low-valence vanadium in secondary slag particles is difficult to be continuously oxidized, so that the roasting effect of the secondary slag is seriously influenced, the clinker conversion rate of the secondary slag is low, the vanadium yield of a system is low, and the release of productivity is seriously restricted.
Disclosure of Invention
Based on the problems in the prior art, the invention provides a roasting method of secondary slag, which can improve the clinker conversion rate of the secondary slag, improve the vanadium yield of a system and overcome the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the embodiment of the invention provides a roasting method of secondary slag, which comprises the following steps:
uniformly mixing the secondary slag and the fine slag to obtain mixed slag;
adding sodium carbonate into the mixed slag, and uniformly mixing to obtain a mixed material;
sequentially carrying out preheating treatment, high-temperature treatment and cooling treatment on the mixed material to obtain clinker;
when the vanadium content of the secondary slag is 1.0 wt% -2.5 wt%, the preheating temperature is 280-380 ℃, the high-temperature treatment temperature is 750-850 ℃, and the cooling temperature is 550-620 ℃.
According to the roasting method of the secondary slag, the secondary slag and the fine slag are mixed and then roasted, so that the total vanadium content of the mixed slag can be improved, and the optimal temperature ranges of preheating treatment, high-temperature treatment and cooling treatment are determined according to the vanadium content in the mixed slag. The invention can meet the conditions required by the oxidation of vanadium and the generation of sodium vanadate, prevent the secondary slag from forming a sintering layer in the roasting process, prolong the oxidation reaction time of low-valence vanadium in the secondary slag, effectively prevent the over-burning of mixed materials and the over-high local temperature, and avoid the formation of a secondary temperature in a preheating zone by accurately controlling the temperature of the preheating treatment, the high-temperature treatment and the cooling treatment.
Preferably, the vanadium content in the secondary slag is 0.5 wt% -3 wt%, and the vanadium content in the refined slag is 4.5 wt% -5.5 wt%.
Preferably, the mass ratio of the secondary slag to the fine slag is 2.5-3.5: 1.
The invention determines the adding amount of the refined slag according to the vanadium content in the secondary slag, and ensures that the vanadium content in the mixed slag is within the range of 2.0 wt% -3.5 wt%.
Preferably, the mass ratio of the mass of the sodium carbonate to the mass of the vanadium pentoxide in the mixed slag is 0.4-0.9: 1.
preferably, the preheating treatment time is 1.5-2 h, the high-temperature treatment time is 2-2.5 h, and the cooling treatment time is 0.5-1 h.
According to the invention, through accurately controlling the preheating treatment time, the high-temperature treatment time and the cooling treatment time, on the premise of ensuring the conditions required by the oxidation of vanadium and the generation of sodium vanadate, the oxidation reaction time can be prolonged in a targeted manner, the phenomena of overburning of mixed materials and overhigh local temperature can be effectively avoided, and the roasting cost of secondary slag is reduced.
Preferably, when the content of vanadium in the mixed slag is 2.0 wt% -2.4 wt%, the mass ratio of the mass of the sodium carbonate to the mass of the vanadium pentoxide in the mixed slag is 0.4-0.5: 1, the temperature of the preheating treatment is 280-320 ℃, the temperature of the high-temperature treatment is 750-780 ℃, and the temperature of the cooling treatment is 550-620 ℃.
Preferably, when the content of vanadium in the mixed slag is 2.5 wt% -3.0 wt%, the mass ratio of the mass of the sodium carbonate to the mass of the vanadium pentoxide in the mixed slag is 0.6-0.7: 1, the temperature of the preheating treatment is 300-340 ℃, the temperature of the high-temperature treatment is 790-820 ℃, and the temperature of the cooling treatment is 550-620 ℃.
Preferably, when the content of vanadium in the mixed slag is 3.1 wt% -3.5 wt%, the mass ratio of the mass of the sodium carbonate to the mass of the vanadium pentoxide in the mixed slag is 0.8-0.9: 1, the temperature of the preheating treatment is 350-380 ℃, the temperature of the high-temperature treatment is 830-850 ℃, and the temperature of the cooling treatment is 550-620 ℃.
According to the roasting method of the secondary slag, provided by the invention, the total vanadium content of the mixed slag can be improved by adjusting the ratio of the secondary slag to the refined slag, the optimal temperature ranges of preheating treatment, high-temperature treatment and cooling treatment are determined according to the vanadium content in the mixed slag, the mass ratio of the quality of sodium carbonate to vanadium pentoxide in the mixed slag and the temperature ranges of the preheating treatment, the high-temperature treatment and the cooling treatment are accurately controlled according to the vanadium content in different mixed slag, and the clinker conversion rate of the secondary slag can be improved by at least three percentage points by the roasting method of the secondary slag, so that the total vanadium content of the waste slag is reduced, the vanadium yield of a system is improved, and the roasting cost of the secondary slag is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 0.6 wt% and the refined slag with the vanadium content of 5.5 wt%, wherein the mass ratio of the secondary slag to the refined slag is 2.5:1, and obtaining the mixed slag with the vanadium content of 2.0 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 2.0 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.5: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled to be 280 ℃, the highest temperature of a burning zone is controlled to be 850 ℃, the temperature of a cooling zone is controlled to be 550 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, the clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 70.52%.
Example 2
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 1.75 wt% and the refined slag with the vanadium content of 5 wt%, wherein the mass ratio of the secondary slag to the refined slag is 4:1, and obtaining the mixed slag with the vanadium content of 2.4 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 2.4 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.4: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled to be 320 ℃, the highest temperature of a burning zone is controlled to be 750 ℃, the temperature of a cooling zone is controlled to be 620 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 73.50%.
Example 3
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 1.5 wt% and the refined slag with the vanadium content of 4.5 wt%, wherein the mass ratio of the secondary slag to the refined slag is 3.5:1, and obtaining the mixed slag with the vanadium content of 2.2 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 2.2 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.4: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled at 300 ℃, the highest temperature of a burning zone is controlled at 770 ℃, the temperature of a cooling zone is controlled at 600 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 76.85%.
Example 4
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 1.9 wt% and the refined slag with the vanadium content of 4.5 wt%, wherein the mass ratio of the secondary slag to the refined slag is 3.5:1, and obtaining the mixed slag with the vanadium content of 2.5 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 2.5 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.6: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled at 340 ℃, the highest temperature of a burning zone is controlled at 790 ℃, the temperature of a cooling zone is controlled at 620 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 76.88%.
Example 5
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 2.0 wt% and the fine slag with the vanadium content of 5.5 wt%, wherein the mass ratio of the secondary slag to the fine slag is 2.5:1, and obtaining the mixed slag with the vanadium content of 3.0 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 3.0 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.7: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled to be 300 ℃, the highest temperature of a burning zone is controlled to be 820 ℃, the temperature of a cooling zone is controlled to be 550 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 76.91%.
Example 6
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 2 wt% and the refined slag with the vanadium content of 5 wt%, wherein the mass ratio of the secondary slag to the refined slag is 4:1, and obtaining the mixed slag with the vanadium content of 2.6 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 2.6 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.7: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled to be 320 ℃, the highest temperature of a burning zone is controlled to be 800 ℃, the temperature of a cooling zone is controlled to be 600 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 83.52%.
Example 7
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 2.7 wt% and the refined slag with the vanadium content of 4.5 wt%, wherein the mass ratio of the secondary slag to the refined slag is 3.5:1, and obtaining the mixed slag with the vanadium content of 3.1 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 3.1 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.9: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled at 350 ℃, the highest temperature of a burning zone is controlled at 850 ℃, the temperature of a cooling zone is controlled at 550 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 83.55%.
Example 8
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 2.7 wt% and the refined slag with the vanadium content of 5.5 wt%, wherein the mass ratio of the secondary slag to the refined slag is 2.5:1, and obtaining the mixed slag with the vanadium content of 3.5 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 3.5 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.8: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled to be 380 ℃, the highest temperature of a burning zone is controlled to be 830 ℃, the temperature of a cooling zone is controlled to be 620 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 83.57%.
Example 9
The embodiment provides a roasting method of secondary slag, which comprises the following steps:
(1) uniformly mixing the secondary slag with the vanadium content of 3 wt% and the refined slag with the vanadium content of 5 wt%, wherein the mass ratio of the secondary slag to the refined slag is 4:1, and obtaining the mixed slag with the vanadium content of 3.4 wt%.
(2) Adding sodium carbonate into the mixed slag with the vanadium content of 3.4 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.8: 1.
(3) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled at 360 ℃, the highest temperature of a burning zone is controlled at 840 ℃, the temperature of a cooling zone is controlled at 600 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 84.35%.
Comparative example 1
The comparative example provides a roasting method of secondary slag tested in the research process, comprising the following steps:
(1) adding sodium carbonate into secondary slag with the vanadium content of 1.2 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the secondary slag is 2.5: 1.
(2) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled to be 300 ℃, the highest temperature of a burning zone is controlled to be 780 ℃, the temperature of a cooling zone is controlled to be 550 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 67.55%.
Comparative example 2
The comparative example provides a roasting method of secondary slag tested in the research process, comprising the following steps:
(1) adding sodium carbonate into secondary slag with the vanadium content of 1.1 wt%, and uniformly mixing to obtain a mixed material, wherein the mass ratio of the sodium carbonate to the vanadium pentoxide in the secondary slag is 2.4: 1.
(2) and (3) putting the mixed material into a rotary kiln for sodium oxide roasting, wherein the temperature of the head end of a preheating zone in the rotary kiln is controlled to be 320 ℃, the highest temperature of a burning zone is controlled to be 760 ℃, the temperature of a cooling zone is controlled to be 550 ℃, clinker obtained after sodium oxide roasting and sintering is immediately taken out of the kiln, and the measured conversion rate of the clinker is 65.05%.
As can be seen from the conversion rates of the clinkers of the examples 1 to 9 and the comparative examples 1 to 2, the clinker conversion rate of the secondary slag can be improved by at least three percentage points by the roasting method of the secondary slag, so that the total vanadium content of the waste slag is reduced, and the vanadium yield of a system is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The roasting method of the secondary slag is characterized by comprising the following steps:
uniformly mixing the secondary slag and the fine slag to obtain mixed slag;
adding sodium carbonate into the mixed slag, and uniformly mixing to obtain a mixed material;
sequentially carrying out preheating treatment, high-temperature treatment and cooling treatment on the mixed material to obtain clinker;
when the vanadium content in the mixed slag is 2.0 wt% -3.5 wt%, the preheating temperature is 280-380 ℃, the high-temperature treatment temperature is 750-850 ℃, and the cooling temperature is 550-620 ℃.
2. The roasting method of secondary slag according to claim 1, characterized in that: the vanadium content in the secondary slag is 0.5 wt% -3 wt%, and the vanadium content in the refined slag is 4.5 wt% -5.5 wt%.
3. The roasting method of secondary slag according to claim 2, characterized in that: the mass ratio of the secondary slag to the fine slag is 2.5-3.5: 1.
4. The roasting method of secondary slag according to claim 3, characterized in that: the mass ratio of the sodium carbonate to the vanadium pentoxide in the mixed slag is 0.4-0.9: 1.
5. the roasting method of secondary slag according to claim 4, characterized in that: the preheating treatment time is 1.5-2 h, the high-temperature treatment time is 2-2.5 h, and the cooling treatment time is 0.5-1 h.
6. The method for roasting secondary slag according to any one of claims 1 to 5, wherein: when the content of vanadium in the mixed slag is 2.0 wt% -2.4 wt%, the mass ratio of the mass of the sodium carbonate to the mass of vanadium pentoxide in the mixed slag is 0.4-0.5: 1, the temperature of the preheating treatment is 280-320 ℃, the temperature of the high-temperature treatment is 750-780 ℃, and the temperature of the cooling treatment is 550-620 ℃.
7. The method for roasting secondary slag according to any one of claims 1 to 5, wherein: when the content of vanadium in the mixed slag is 2.5 wt% -3.0 wt%, the mass ratio of the mass of the sodium carbonate to the mass of vanadium pentoxide in the mixed slag is 0.6-0.7: 1, the temperature of the preheating treatment is 300-340 ℃, the temperature of the high-temperature treatment is 790-820 ℃, and the temperature of the cooling treatment is 550-620 ℃.
8. The method for roasting secondary slag according to any one of claims 1 to 5, wherein: when the content of vanadium in the mixed slag is 3.1-3.5 wt%, the mass ratio of the mass of the sodium carbonate to the mass of vanadium pentoxide in the mixed slag is 0.8-0.9: 1, the temperature of the preheating treatment is 350-380 ℃, the temperature of the high-temperature treatment is 830-850 ℃, and the temperature of the cooling treatment is 550-620 ℃.
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| CN202111193053.6A CN113981208A (en) | 2021-10-13 | 2021-10-13 | Roasting method of secondary slag |
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| CN202111193053.6A CN113981208A (en) | 2021-10-13 | 2021-10-13 | Roasting method of secondary slag |
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| CN111575506A (en) * | 2020-05-20 | 2020-08-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for pelletizing and extracting vanadium from vanadium extraction tailings |
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| CN108531718A (en) * | 2018-04-23 | 2018-09-14 | 东北大学 | A method of producing chrome green using tailings in vanadium extraction |
| CN109825723A (en) * | 2019-03-07 | 2019-05-31 | 河钢股份有限公司承德分公司 | A method of utilizing alkaline tailings depth vanadium extraction |
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