CN117919646A - Method for treating high-fluorine ammonia-containing slag - Google Patents
Method for treating high-fluorine ammonia-containing slag Download PDFInfo
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- CN117919646A CN117919646A CN202410316538.7A CN202410316538A CN117919646A CN 117919646 A CN117919646 A CN 117919646A CN 202410316538 A CN202410316538 A CN 202410316538A CN 117919646 A CN117919646 A CN 117919646A
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- fluorine
- ammonia
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- containing slag
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000011737 fluorine Substances 0.000 title claims abstract description 80
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 80
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002893 slag Substances 0.000 title claims description 75
- 239000000706 filtrate Substances 0.000 claims abstract description 30
- 229910004261 CaF 2 Inorganic materials 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims description 56
- 238000010438 heat treatment Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000002002 slurry Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- VYOZKLLJJHRFNA-UHFFFAOYSA-N [F].N Chemical compound [F].N VYOZKLLJJHRFNA-UHFFFAOYSA-N 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000011575 calcium Substances 0.000 abstract description 40
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 27
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 9
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- LDDQLRUQCUTJBB-UHFFFAOYSA-N ammonium fluoride Chemical compound [NH4+].[F-] LDDQLRUQCUTJBB-UHFFFAOYSA-N 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 description 1
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of waste residue treatment, and particularly relates to a method for treating high-fluorine ammonia-containing residues, which adopts Ca (ClO) 2 to simultaneously treat fluorine and ammonia in the high-fluorine ammonia-containing residues, NH 4 + is converted into N 2 to overflow, F ‑ is combined with calcium element in Ca (ClO) 2 to generate CaF 2 to enter filter residues, most fluorine element in the high-fluorine ammonia-containing residues is generated to generate CaF 2 to enter the filter residues, so that the amount of fluorine element entering filtrate is reduced, the consumption of a fluorine removing agent is reduced, and meanwhile, the generation of fluorine removing residues is also reduced, and the treatment cost is reduced within a certain range.
Description
Technical Field
The invention belongs to the technical field of waste residue treatment, and particularly relates to a method for treating high-fluorine ammonia-containing slag.
Background
In the industries of ore dressing and smelting of tungsten, fluorite (the main component is CaF 2) is scheelite associated ore, and the problems of incomplete separation and high cost exist in separating fluorite from scheelite by the current ore dressing technology, and other fluorine-containing minerals cause that the fluorine content of the current scheelite reaches more than 12 wt%. Most scheelite is decomposed by an acid method process to prepare tungstic acid first and then decomposed by alkali to prepare sodium tungstate solution, but the process flow is too long. The ammonia solution is prepared by dissolving a few of direct ammonia into ammonia tungstate solution, and is crystallized to prepare APT after impurity removal, the process flow is short, the product is rapidly produced, but more high-fluorine ammonia-containing slag (the fluorine content is 8-12 wt percent, the ammonia content is 2.5-4 wt percent) is produced, the fluorine element and ammonia nitrogen contained in the slag must be treated according to the national environmental protection requirement, the main mode of treating the slag is to remove the ammonia nitrogen through alkali dissolution, but a large amount of steam is consumed, and the consumption is generally only reduced to about 200 ppm; wherein a large amount of fluorine elements enter the wastewater to be treated by adding a fluorine removal agent, the fluorine removal agent has high consumption and high cost, and the fluorine removal slag still needs to be treated according to dangerous waste.
Disclosure of Invention
In order to solve the problems in the prior art, the main purpose of the invention is to provide a method for treating high-fluorine ammonia-containing slag.
In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided:
A method for treating high fluorine ammonia-containing slag, comprising the steps of:
s1, adding high-fluorine ammonia-containing slag into a container, adding a certain amount of water, and stirring to obtain slag slurry;
S2, heating the slag slurry while stirring, wherein the heating temperature is 50-70 ℃, and the heating time is 1.5-2.0 h; adding a certain amount of Ca (ClO) 2 while stirring;
s3, filtering to obtain filtrate and filter residues, and treating the high-fluorine ammonia-containing residues.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S1, the liquid-solid ratio in the container is (2-2.1) m 3:1 t.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S1, the stirring speed is 40-50 r/min, and the stirring time is 2-3 h.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S1, the container is a steamer.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S2, ca (ClO) 2 is added in the form of powder.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S2, the addition amount of Ca (ClO) 2 is 1.2 to 1.5 times the larger amount of Ca (ClO) 2 required for treating F - and NH 4 + in the high-fluorine ammonia-containing slag, respectively.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S2, the stirring speed in the Ca (ClO) 2 adding process is 20-25 r/min.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S2, 30-40% of Ca (ClO) 2 is slowly added within 0.5h, the rest of Ca (ClO) 2 is added within the following 0.5h, and then the stirring speed is adjusted to be 45-50 r/min.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S2, a hot water coil pipe of the steam pot is started to heat the slag slurry while stirring.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S3, the NH 4 + content in the filtrate is less than 20ppm, and the F - content in the filtrate is less than 15ppm.
As a preferable scheme of the method for treating the high-fluorine ammonia-containing slag, the invention comprises the following steps: in the step S3, the content of CaF 2 in the filter residue is more than 21wt percent, and the content of NH 4 + in the filter residue is less than 0.2wt percent.
The beneficial effects of the invention are as follows:
The invention provides a method for treating high-fluorine ammonia-containing slag, which adopts Ca (ClO) 2 to simultaneously treat fluorine and ammonia in the high-fluorine ammonia-containing slag, NH 4 + is converted into N 2 to overflow, F - is combined with calcium element in Ca (ClO) 2 to generate CaF 2 to enter filter residues, most fluorine element in the high-fluorine ammonia-containing slag is generated to generate CaF 2 to enter the filter residues, the amount of fluorine element entering filtrate is reduced, the consumption of a fluorine removing agent is reduced, and meanwhile, the generation of fluorine removing slag is also reduced, so that the treatment cost is reduced within a certain range.
Detailed Description
The following description will be made clearly and fully with reference to the technical solutions in the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to one aspect of the invention, the invention provides the following technical scheme:
A method for treating high fluorine ammonia-containing slag, comprising the steps of:
s1, adding high-fluorine ammonia-containing slag into a container, adding a certain amount of water, and stirring for 2-3 hours to obtain slag slurry;
S2, heating the slag slurry while stirring, wherein the heating temperature is 50-70 ℃, and the heating time is 1.5-2.0 h; adding a certain amount of Ca (ClO) 2 while stirring;
s3, filtering to obtain filtrate and filter residues, and treating the high-fluorine ammonia-containing residues.
The process reaction equation of the invention is:
2NH4 ++3ClO-=N2↑+3H2O+2H++3Cl-；
Ca2++2F-=CaF2↓。
Preferably, in the step S1, a certain amount of water is usually contained in the high-fluorine ammonia-containing slag, and after the high-fluorine ammonia-containing slag is added, a certain amount of water is added, and the liquid-solid ratio in the container is controlled to be (2-2.1) m 3:1 t. Specifically, the liquid-solid ratio in the container may be, for example, any one or a range between any two of 2m3:1t、2.01m3:1t、2.02m3:1t、2.03m3:1t、2.04m3:1t、2.05m3:1t、2.06m3:1t、2.07m3:1t、2.08m3:1t、2.09m3:1t、2.1m3:1t.
Preferably, in the step S1, the stirring speed is 40-50 r/min; stirring for 2-3 hours; the container is a steam pot. The slag is pulped by fully utilizing the characteristics of fluidity and solubility of liquid-phase water, so that most of ammonia fluoride mechanically mixed in the slag is dissolved in the water and uniformly distributed, and specifically, the stirring speed can be, for example, any one or any range between 40r/min, 41r/min, 42r/min, 43r/min, 44r/min, 45r/min, 46r/min, 47r/min, 48r/min, 49r/min and 50 r/min. The stirring time may be, for example, any one or a range between any two of 2h, 2.1h, 2.2h, 2.3h, 2.4h, 2.5h, 2.6h, 2.7h, 2.8h, 2.9h, 3h.
Preferably, in the step S2, the slurry is heated while stirring, specifically, the hot water coil of the steam pot is started to heat the slurry while stirring; the heating temperature is 50-70 ℃, and the heating time is 1.5-2.0 h; the heating is favorable for dissolving the rest small part of ammonia fluoride in the liquid phase and accelerating the reaction speed; specifically, the heating temperature may be, for example, in a range between any one or any two of 50 ℃, 55 ℃,60 ℃, 65 ℃, 70 ℃; the heating time may be, for example, in a range between any one or any two of 1.5h, 1.6h, 1.7h, 1.8h, 1.9h, 2 h.
Preferably, in the step S2, ca (ClO) 2 is added in the form of powder; the addition amount of Ca (ClO) 2 is 1.2-1.5 times that of Ca (ClO) 2 required for treating F - and NH 4 + in the high-fluorine ammonia-containing slag respectively. Specifically, the addition amount of Ca (ClO) 2 may be in a range between any one or any two of 1.2 times, 1.25 times, 1.3 times, 1.35 times, 1.4 times, 1.45 times, 1.5 times the amount of Ca (ClO) 2 required for treating F - and NH 4 +, respectively, in the high-fluorine ammonia-containing slag.
Preferably, in the step S2, the stirring speed in the adding process of Ca (ClO) 2 is 20-25 r/min; slowly adding 30-40% of Ca (ClO) 2 in 0.5h, adding the rest Ca (ClO) 2 in the following 0.5h, and then adjusting the stirring speed to be 45-50 r/min. The stirring speed was adjusted and Ca (ClO) 2 was slowly added to prevent the excessive reaction due to the too large contact surface and the high concentration of Ca (ClO) 2, which affects the treatment effect.
Preferably, in the step S3, the NH 4 + content in the filtrate is less than 20ppm, and the F - content in the filtrate is less than 15ppm; the content of CaF 2 in the filter residue is more than 21wt%, and the content of NH 4 + in the filter residue is less than 0.2wt%.
The technical scheme of the invention is further described below by combining specific embodiments.
Example 1
A method for treating high fluorine ammonia-containing slag, comprising the steps of:
S1, adding 2.0t of high-fluorine ammonia-containing slag (the water content is 15wt%, the fluorine content is 9.5wt%, and the NH 4 + content is 3.5 wt%) into a steam kettle, adding 3.1m 3 water, and stirring for 2 hours at a stirring speed of 50r/min to obtain slag slurry, wherein the liquid-solid ratio in a container is 2m 3:1 t;
S2, starting a hot water coil pipe of a steam pot to heat the slag slurry while stirring, wherein the heating temperature is 50 ℃, and the heating time is 2 hours; 440kg of Ca (ClO) 2 powder was added while stirring; the stirring speed in the Ca (ClO) 2 adding process is 20r/min; 33% of Ca (ClO) 2 was slowly added over 0.5h, and the remaining Ca (ClO) 2 was added over the subsequent 0.5h, after which the stirring speed was adjusted to 50r/min.
S3, filtering to obtain filtrate and filter residues, and treating high-fluorine ammonia-containing residues; the NH 4 + content in the filtrate was 15.5ppm, and the F - content in the filtrate was 14.2ppm; the CaF 2 content in the filter residue was 21.5wt%, and the NH 4 + content in the filter residue was 0.16wt%.
Example 2
A method for treating high fluorine ammonia-containing slag, comprising the steps of:
S1, adding 2.0t of high-fluorine ammonia-containing slag (the water content is 15wt%, the fluorine content is 9.5wt%, and the NH 4 + content is 3.5 wt%) into a steam kettle, adding 3.1m 3 water, and stirring for 2 hours at a stirring speed of 50r/min to obtain slag slurry, wherein the liquid-solid ratio in a container is 2m 3:1 t;
S2, starting a hot water coil pipe of a steam pot to heat the slag slurry while stirring, wherein the heating temperature is 50 ℃, and the heating time is 1.5h; 440kg of Ca (ClO) 2 powder was added while stirring; the stirring speed in the Ca (ClO) 2 adding process is 20r/min; 35% of Ca (ClO) 2 was slowly added over 0.5h, and the remaining Ca (ClO) 2 was added over the subsequent 0.5h, after which the stirring speed was adjusted to 50r/min.
S3, filtering to obtain filtrate and filter residues, and treating high-fluorine ammonia-containing residues; the NH 4 + content in the filtrate was 19.5ppm, and the F - content in the filtrate was 14.6ppm; the CaF 2 content in the filter residue was 21.2wt%, and the NH 4 + content in the filter residue was 0.17wt%.
Example 3
A method for treating high fluorine ammonia-containing slag, comprising the steps of:
S1, adding 2.0t of high-fluorine ammonia-containing slag (the water content is 15wt%, the fluorine content is 9.5wt%, and the NH 4 + content is 3.5 wt%) into a steam kettle, adding 3.1m 3 water, and stirring for 3 hours at a stirring speed of 50r/min to obtain slag slurry, wherein the liquid-solid ratio in a container is 2m 3:1 t;
S2, starting a hot water coil pipe of a steam pot to heat the slag slurry while stirring, wherein the heating temperature is 50 ℃, and the heating time is 2 hours; 440kg of Ca (ClO) 2 powder was added while stirring; the stirring speed in the Ca (ClO) 2 adding process is 20r/min; 35% of Ca (ClO) 2 was slowly added over 0.5h, and the remaining Ca (ClO) 2 was added over the subsequent 0.5h, after which the stirring speed was adjusted to 50r/min.
S3, filtering to obtain filtrate and filter residues, and treating high-fluorine ammonia-containing residues; the NH 4 + content in the filtrate was 15.7ppm, and the F - content in the filtrate was 14.5ppm; the CaF 2 content in the filter residue was 21.4wt%, and the NH 4 + content in the filter residue was 0.17wt%.
Example 4
A method for treating high fluorine ammonia-containing slag, comprising the steps of:
S1, adding 2.0t of high-fluorine ammonia-containing slag (the water content is 15wt%, the fluorine content is 9.5wt%, and the NH 4 + content is 3.5 wt%) into a steam kettle, adding 3.3m 3 water, and stirring for 2.5 hours at a stirring speed of 40r/min under a liquid-solid ratio of 2.1m 3:1 t in a container to obtain slag slurry;
S2, starting a hot water coil pipe of a steam pot to heat the slag slurry while stirring, wherein the heating temperature is 70 ℃, and the heating time is 2 hours; 550kg of Ca (ClO) 2 powder was added while stirring; the stirring speed during the addition of Ca (ClO) 2 is 25r/min; 30% of Ca (ClO) 2 was slowly added over 0.5h, and the remaining Ca (ClO) 2 was added over the subsequent 0.5h, after which the stirring speed was adjusted to 45r/min.
S3, filtering to obtain filtrate and filter residues, and treating high-fluorine ammonia-containing residues; the NH 4 + content in the filtrate was 15.1ppm, and the F - content in the filtrate was 13.9ppm; the CaF 2 content in the filter residue was 21.6wt%, and the NH 4 + content in the filter residue was 0.18wt%.
Comparative example 1
The difference from the examples is that 2.2m 3 of water is added in step S1, and the liquid-solid ratio in the vessel is 1.5m 3:1 t.
In the comparative example, the fluidity is insufficient due to the low liquid-solid ratio, and the stirring resistance is high so that the current of the stirring motor is high. The NH 4 + content in the filtrate was 45.1ppm, and the F - content in the filtrate was 38.9ppm; the content of CaF 2 in the filter residue was 18.9wt%, and the content of NH 4 + in the filter residue was 0.56wt%.
Comparative example 2
The difference from example 1 is that 440kg of Ca (ClO) 2 powder was added at a time at the start of stirring in step S2.
The comparative example has the phenomenon of pot-out, and cannot realize the treatment of high-fluorine ammonia-containing slag.
Comparative example 3
The difference from example 1 is that 365kg of Ca (ClO) 2 powder was added while stirring in step S2.
In this comparative example, ca (ClO) 2 powder was not excessively added, the NH 4 + content in the filtrate was 26.5ppm, and the F - content in the filtrate was 22.1ppm; the content of CaF 2 in the filter residue was 19.6wt%, and the content of NH 4 + in the filter residue was 0.23wt%.
Comparative example 4
The difference from example 1 is that no heating is performed in step S2.
The NH 4 + content in the filtrate of this comparative example was 30.9ppm, and the F - content in the filtrate was 29.8ppm; the content of CaF 2 in the filter residue was 19.3wt%, and the content of NH 4 + in the filter residue was 0.22wt%.
As can be seen from the above examples and comparative examples, the invention adopts Ca (ClO) 2 to simultaneously treat fluorine and ammonia in the high-fluorine ammonia-containing slag, NH 4 + is converted into N 2 to overflow, F - is combined with calcium element in Ca (ClO) 2 to generate CaF 2 to enter the slag, and most fluorine element in the high-fluorine ammonia-containing slag is generated to generate CaF 2 to enter the slag, so that the amount of fluorine element entering the filtrate is reduced, the consumption of fluorine removing agent is reduced, and meanwhile, the generation of fluorine removing slag is also reduced, thereby reducing the treatment cost within a certain range.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the content of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. A method for treating high fluorine ammonia-containing slag, comprising the steps of:
s1, adding high-fluorine ammonia-containing slag into a container, adding a certain amount of water, and stirring to obtain slag slurry;
S2, heating the slag slurry while stirring, wherein the heating temperature is 50-70 ℃, and the heating time is 1.5-2.0 h; adding a certain amount of Ca (ClO) 2 while stirring;
s3, filtering to obtain filtrate and filter residues, and treating the high-fluorine ammonia-containing residues.
2. The method for treating high-fluorine ammonia-containing slag according to claim 1, wherein in the step S1, the liquid-solid ratio in the container is (2-2.1) m 3:1 t.
3. The method for treating high-fluorine ammonia-containing slag according to claim 1, wherein in the step S1, the stirring speed is 40-50 r/min, and the stirring time is 2-3 h.
4. The method for treating high-fluorine ammonia-containing slag according to claim 1, wherein in the step S1, the vessel is a steam pot.
5. The method for treating high-fluorine ammonia-containing slag according to claim 1, wherein in the step S2, ca (ClO) 2 is added in the form of powder.
6. The method for treating high-fluorine ammonia-containing slag according to claim 1, wherein in the step S2, the addition amount of Ca (ClO) 2 is 1.2 to 1.5 times the larger amount of Ca (ClO) 2 required for treating F - and NH 4 +, respectively, in the high-fluorine ammonia-containing slag.
7. The method for treating high-fluorine ammonia-containing slag according to claim 1, wherein in the step S2, the stirring speed in the Ca (ClO) 2 adding process is 20-25 r/min.
8. The method for treating high-fluorine ammonia-containing slag according to claim 1, wherein in the step S2, 30-40% of Ca (ClO) 2 is slowly added within 0.5h, the rest of Ca (ClO) 2 is added within the subsequent 0.5h, and then the stirring speed is adjusted to 45-50 r/min.
9. The method for treating high-fluorine ammonia-containing slag as set forth in claim 4, wherein in said step S2, the hot water coil of the steam kettle is turned on to heat the slag slurry while stirring.
10. The method for treating high-fluorine ammonia-containing slag according to claim 1, wherein in the step S3, the NH 4 + content in the filtrate is less than 20ppm, and the F - content in the filtrate is less than 15ppm; the content of CaF 2 in the filter residue is more than 21wt%, and the content of NH 4 + in the filter residue is less than 0.2wt%.
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