CN114655934A - Method for producing sodium sulfide by treating sodium sulfate by combining rotary kiln and electric furnace - Google Patents
Method for producing sodium sulfide by treating sodium sulfate by combining rotary kiln and electric furnace Download PDFInfo
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- CN114655934A CN114655934A CN202210252450.4A CN202210252450A CN114655934A CN 114655934 A CN114655934 A CN 114655934A CN 202210252450 A CN202210252450 A CN 202210252450A CN 114655934 A CN114655934 A CN 114655934A
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- Prior art keywords
- sodium sulfide
- electric furnace
- rotary kiln
- sodium sulfate
- water
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- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 title claims abstract description 48
- 229910052979 sodium sulfide Inorganic materials 0.000 title claims abstract description 47
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052938 sodium sulfate Inorganic materials 0.000 title claims abstract description 38
- 235000011152 sodium sulphate Nutrition 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000006722 reduction reaction Methods 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- RSIJVJUOQBWMIM-UHFFFAOYSA-L sodium sulfate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]S([O-])(=O)=O RSIJVJUOQBWMIM-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000004615 ingredient Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000003546 flue gas Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 230000002950 deficient Effects 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 238000011946 reduction process Methods 0.000 claims description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical group C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003830 anthracite Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract description 5
- 239000002918 waste heat Substances 0.000 abstract description 5
- 239000003054 catalyst Substances 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 12
- 239000000243 solution Substances 0.000 description 7
- 239000010446 mirabilite Substances 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- XTHCSHLLMNWUNM-UHFFFAOYSA-N disodium sulfuric acid sulfide Chemical compound S(=O)(=O)(O)O.[Na+].[S-2].[Na+] XTHCSHLLMNWUNM-UHFFFAOYSA-N 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/22—Alkali metal sulfides or polysulfides
- C01B17/24—Preparation by reduction
- C01B17/26—Preparation by reduction with carbon
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/22—Alkali metal sulfides or polysulfides
- C01B17/36—Purification
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for producing sodium sulfide by treating sodium sulfate by combining a rotary kiln and an electric furnace, which comprises the following steps: (1) drying sodium sulfate (Natrii sulfas or Natrii sulfas) in rotary kiln, and heating; (2) mixing the hot calcine obtained in the step (1) with a reducing agent ingredient; (3) electric furnace reduction smelting; (4) feeding the crude sodium sulfide obtained in the step (3) into a water-soluble system for water-dissolving; (5) crystallizing to produce sodium sulfide. The invention can solve the problems that the material melting speed is low, the sodium sulfide product is easy to be secondarily oxidized, catalysts containing iron, nickel and the like are required to be added to promote the reduction reaction of sodium sulfate, the product quality is poor, the existing materials are easy to melt and stick to the wall, the reaction is not thorough, the discharging is difficult, the power consumption is high, the smoke generated by electric furnace reduction contains more water, the acidity is strong, the heat utilization rate of the whole system is low due to corrosion to a waste heat boiler and serious adhesion in the existing production method of sodium sulfide.
Description
Technical Field
The invention relates to the technical field of smelting processes, in particular to a method for producing sodium sulfide by treating sodium sulfate by combining a rotary kiln and an electric furnace.
Background
At present, three fire methods, namely a reverberatory furnace method, a rotary kiln method and a traditional electric furnace reduction smelting, are mainly adopted in industrial application to prepare sodium sulfide from sodium sulfate through reduction. The main process flow is as follows:
reverberatory furnace process 1:
the technical process of the reverberatory furnace comprises the following steps: sodium sulfate → mixing with reducing agent → smelting in reverberatory furnace → discharging water solution from weir crest → producing sodium sulfide by crystallization.
Sodium sulfate and a reducing agent are mixed, the mixture is added into a reverberatory furnace through a skip car for reduction smelting, the smelted sodium sulfide melt is discharged through a weir crest and enters a water-soluble system, and the sodium sulfide aqueous solution is evaporated and crystallized to obtain sodium sulfide crystals.
And (3) rotary kiln process 2:
sodium sulfate → proportioning with reducing agent → reduction in rotary kiln → dissolving in water → crystallization for producing sodium sulfide.
Sodium sulfate and a reducing agent are mixed, the mixture is added into a rotary kiln through a metering belt for reduction smelting, sodium sulfide after the smelting reduction falls into a water-soluble system, and a sodium sulfide aqueous solution is evaporated and crystallized to obtain sodium sulfide crystals.
Traditional electric furnace process 3:
sodium sulfate → mixing with a reducing agent → electric furnace reduction smelting → discharging water solution from weir crest → producing sodium sulfide by crystallization. Electric furnace flue gas → exhaust-heat boiler → dust collector → desulfurization and denitrification → evacuation.
Through production practice, it was found that the following problems were present in the processes 1, 2 and 3:
the process 1:
(1) sodium sulfate is discontinuously and batched in the process of treating the sodium sulfate by the reverberatory furnace, and because the reduction process of the sodium sulfate is a strong heat absorption process, after a mixed material of the sodium sulfate and a reducing agent is added into the reverberatory furnace through a skip car, a cold area appears at a material pile, and the material melting speed is slow;
(2) the reverberatory furnace belongs to radiation heating, cannot effectively heat a reactor pile, has low heat energy utilization, further aggravates material melting, has low speed, and further forms freezing and material pile in a material feeding area;
(3) the reverberatory furnace is heated by burning natural gas, and the hearth is always in micro-oxidation atmosphere, so that secondary oxidation of sodium sulfide products is easily caused, and irreversible product quality influence is caused.
(II) Process 2:
(1) the reduction temperature of the rotary kiln is below 650 ℃, catalysts containing iron, nickel and the like are required to be added to promote the reduction reaction of sodium sulfate, so that the quality of the product is deteriorated;
(2) the reduction temperature of the rotary kiln is 750-800 ℃, the conversion rate is improved at the moment, no catalyst is needed, but the reaction process always avoids the problems that the lowest eutectic point of the sodium sulfide-sodium sulfate mixture is 665 ℃ along with the increase of the content of the sodium sulfide, the existing materials are melted and adhered to the wall, the reaction cannot be thorough, the discharging is difficult, and the like;
(3) the gas-solid reaction materials are not contacted uniformly, the product stability is poor, and the quality can not be ensured.
(III) Process 3:
(1) sodium sulfate burdening in a cold state enters an electric furnace for reduction smelting, and the problems of high power consumption and poor economy exist;
(2) flue gas generated by electric furnace reduction enters a waste heat boiler, and the flue gas is seriously corroded and bonded to the waste heat boiler due to more water and stronger acidity;
the overall heat utilization rate of the system is low, and in some factories, steam recovered by the waste heat of the boiler cannot be effectively utilized.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for producing sodium sulfide by treating sodium sulfate by combining a rotary kiln and an electric furnace, aiming at the problems that the material melting speed is low, the secondary oxidation of a sodium sulfide product is easily caused, catalysts containing iron, nickel and the like are required to be added to promote the reduction reaction of sodium sulfate, the product quality is poor, the existing materials are easy to melt and stick to walls, the reaction cannot be thorough, the discharging is difficult, the power consumption is high, the smoke generated by electric furnace reduction contains more water, the acidity is strong, the corrosion to a waste heat boiler is caused, and the heat utilization rate of the whole system with serious bonding is low in the existing production method of sodium sulfide.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for producing sodium sulfide by processing sodium sulfate by combining a rotary kiln and an electric furnace comprises the following steps:
(1) feeding sodium sulfate (Natrii sulfas or Natrii sulfas) into a rotary kiln for drying and heating, drying the material water content in the rotary kiln to less than 1%, and heating the material from normal temperature to 450 ℃ to obtain hot-roasted product;
(2) mixing the hot calcine obtained in the step (1) with a reducing agent ingredient, wherein the amount of the reducing agent ingredient is 15%, and then transporting the mixture into an electric furnace in a closed oxygen-deficient state (the concentration of oxygen is less than or equal to 2%);
(3) reducing and smelting in an electric furnace, controlling the smelting temperature of the electric furnace to be between 1100 and 1200 ℃, carrying out reduction reaction to obtain crude sodium sulfide, wherein CO-containing high-temperature flue gas generated in the reduction process is introduced into a secondary combustion chamber for combustion, and the generated heat energy is introduced into a rotary kiln for reutilization;
(4) feeding the crude sodium sulfide obtained in the step (3) into a water-soluble system for water-dissolving to obtain a sodium sulfide solution:
(5) crystallizing to produce sodium sulfide, and evaporating and crystallizing the sodium sulfide water solution to obtain sodium sulfide crystals.
In the step (2), the materials are transferred into the electric furnace through a scraper conveyor or closed oxygen-deficient state transfer equipment.
Wherein, in the step (2), the reducing agent is anthracite, and the carbon content is 15% of that of the hot-roasted sand.
In the step (1), flue gas generated by the rotary kiln is sent into a dust collector for dust removal, and finally, after desulfurization and denitrification, tail gas evacuation is performed.
The invention has the beneficial effects that: the sodium sulfate (mirabilite or anhydrous sodium sulphate) is dried and heated in the rotary kiln, so that the moisture is reduced, and the temperature of the material charged into the electric furnace is increased, thereby reducing the unit consumption of the electric furnace. The water content of mirabilite or anhydrous sodium sulphate is generally between 20 and 30 percent, the mirabilite or anhydrous sodium sulphate can be reduced to be within 0.3 percent by drying in a rotary kiln, the temperature of sodium sulfate (mirabilite or anhydrous sodium sulphate) before entering the kiln is normal temperature, and the rotary kiln can raise the temperature of materials from the normal temperature to 450 ℃; because the temperature of the materials entering the furnace is higher, the power consumption of 150kwh is saved when the electric furnace is used for processing one ton of sodium sulfate (mirabilite or anhydrous sodium sulphate) compared with the common process without temperature raising. The heat energy for drying and raising the temperature of the rotary kiln is derived from CO-containing high-temperature flue gas generated by electric furnace reduction, and the heat energy generated by combustion in a secondary combustion chamber is used for realizing the efficient utilization of the heat energy of the flue gas of the electric furnace. After the hot calcine and the reducing agent are mixed, the mixture is transferred into an electric furnace for smelting in a closed oxygen-poor state (the oxygen concentration is less than or equal to 2 percent), so that the low-temperature side reaction of sodium sulfate, carbon and oxygen can be avoided. .
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1, a method for producing sodium sulfide by processing sodium sulfate by combining a rotary kiln and an electric furnace comprises the following steps:
(1) feeding sodium sulfate (Natrii sulfas or Natrii sulfas) into a rotary kiln for drying and heating, drying the material water content in the rotary kiln to less than 1%, and heating the material from normal temperature to 450 ℃ to obtain hot-roasted product;
(2) mixing the hot calcine obtained in the step (1) with a reducing agent ingredient, wherein the amount of the reducing agent ingredient is 15%, and then transporting the mixture into an electric furnace in a closed oxygen-deficient state (the concentration of oxygen is less than or equal to 2%);
(3) reducing and smelting in an electric furnace, controlling the smelting temperature of the electric furnace to be between 1100 and 1200 ℃, carrying out reduction reaction to obtain crude sodium sulfide, wherein CO-containing high-temperature flue gas generated in the reduction process is introduced into a secondary combustion chamber for combustion, and the generated heat energy is introduced into a rotary kiln for reutilization;
(4) feeding the crude sodium sulfide obtained in the step (3) into a water-soluble system for water-dissolving to obtain a sodium sulfide solution:
(5) crystallizing to produce sodium sulfide, and evaporating and crystallizing the sodium sulfide water solution to obtain sodium sulfide crystals.
In the step (2), the materials are transferred into the electric furnace through a scraper conveyor or closed oxygen-deficient state transfer equipment.
Wherein, in the step (2), the reducing agent is anthracite, and the carbon content is 15% of that of the hot-roasted sand.
In the step (1), flue gas generated by the rotary kiln is sent into a dust collector for dust removal, and finally, after desulfurization and denitrification, tail gas evacuation is performed.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modifications, equivalents, improvements and the like which are made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (4)
1. A method for producing sodium sulfide by processing sodium sulfate by combining a rotary kiln and an electric furnace is characterized by comprising the following steps:
(1) feeding sodium sulfate (Natrii sulfas or Natrii sulfas) into a rotary kiln for drying and heating, drying the material water content in the rotary kiln to less than 1%, and heating the material from normal temperature to 450 ℃ to obtain hot-roasted product;
(2) mixing the hot calcine obtained in the step (1) with a reducing agent ingredient, wherein the amount of the reducing agent ingredient is 15%, and then transporting the mixture into an electric furnace in a closed oxygen-deficient state (the concentration of oxygen is less than or equal to 2%);
(3) reducing and smelting in an electric furnace, controlling the smelting temperature of the electric furnace to be between 1100 and 1200 ℃, carrying out reduction reaction to obtain crude sodium sulfide, wherein CO-containing high-temperature flue gas generated in the reduction process is introduced into a secondary combustion chamber for combustion, and the generated heat energy is introduced into a rotary kiln for reutilization;
(4) feeding the crude sodium sulfide obtained in the step (3) into a water-soluble system for water-dissolving to obtain a sodium sulfide solution:
(5) crystallizing to produce sodium sulfide, and evaporating and crystallizing the sodium sulfide water solution to obtain sodium sulfide crystals.
2. The method for producing sodium sulfide by processing sodium sulfate through combination of a rotary kiln and an electric furnace as claimed in claim 1, wherein: in the step (2), the materials are transported into the electric furnace through a scraper conveyor or closed oxygen-deficient state transporting equipment.
3. The method for producing sodium sulfide by processing sodium sulfate through combination of a rotary kiln and an electric furnace as claimed in claim 1, wherein: in the step (2), the reducing agent is anthracite, and the carbon content is 15% of that of the hot-roasted sand.
4. The method for producing sodium sulfide by processing sodium sulfate through combination of a rotary kiln and an electric furnace as claimed in claim 1, wherein: in the step (1), the flue gas generated by the rotary kiln is sent into a dust collector for dust removal, and finally, after desulfurization and denitrification, tail gas evacuation is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210252450.4A CN114655934A (en) | 2022-03-15 | 2022-03-15 | Method for producing sodium sulfide by treating sodium sulfate by combining rotary kiln and electric furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210252450.4A CN114655934A (en) | 2022-03-15 | 2022-03-15 | Method for producing sodium sulfide by treating sodium sulfate by combining rotary kiln and electric furnace |
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| CN202210252450.4A Pending CN114655934A (en) | 2022-03-15 | 2022-03-15 | Method for producing sodium sulfide by treating sodium sulfate by combining rotary kiln and electric furnace |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE846845C (en) * | 1950-08-17 | 1952-08-18 | Basf Ag | Process for the production of sodium sulfide |
| US4198385A (en) * | 1976-09-07 | 1980-04-15 | Waagner-Biro Aktiengesellschaft | Reduction of sodium sulfate to sodium sulfide |
| CN104528770A (en) * | 2014-12-23 | 2015-04-22 | 湘潭大学 | Mirabilite dehydration method based on gas-liquid direct heat exchange |
| CN105948079A (en) * | 2016-04-26 | 2016-09-21 | 天津理工大学 | High-organic-matter sodium sulfate hazardous waste simple recycling process and system |
| CN109384402A (en) * | 2017-08-10 | 2019-02-26 | 淮安市水泥厂有限公司 | A kind of industrial residue saltcake is used as the processing method of cement ingredient |
| CN110127628A (en) * | 2019-04-23 | 2019-08-16 | 中国中轻国际工程有限公司 | A kind of tank furnace formula vulcanized sodium industrialized production equipment and technique |
| CN112028031A (en) * | 2020-08-04 | 2020-12-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for preparing sodium sulfide by melting reduction of industrial sodium sulfate |
| CN112320767A (en) * | 2020-10-30 | 2021-02-05 | 金川集团股份有限公司 | Novel electric furnace and process method for producing high-purity sodium sulfide |
| CN112573539A (en) * | 2020-12-30 | 2021-03-30 | 广西天源新能源材料有限公司 | Preparation method of anhydrous sodium sulphate based on lithium polymer and spodumene |
| CN113501534A (en) * | 2021-07-20 | 2021-10-15 | 浙江红狮环保股份有限公司 | Method for resource utilization of sodium sulfate waste salt |
| CN113896208A (en) * | 2020-07-06 | 2022-01-07 | 浙江龙盛集团股份有限公司 | Method for treating industrial mixed waste salt by using sulfuric acid |
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2022
- 2022-03-15 CN CN202210252450.4A patent/CN114655934A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE846845C (en) * | 1950-08-17 | 1952-08-18 | Basf Ag | Process for the production of sodium sulfide |
| US4198385A (en) * | 1976-09-07 | 1980-04-15 | Waagner-Biro Aktiengesellschaft | Reduction of sodium sulfate to sodium sulfide |
| CN104528770A (en) * | 2014-12-23 | 2015-04-22 | 湘潭大学 | Mirabilite dehydration method based on gas-liquid direct heat exchange |
| CN105948079A (en) * | 2016-04-26 | 2016-09-21 | 天津理工大学 | High-organic-matter sodium sulfate hazardous waste simple recycling process and system |
| CN109384402A (en) * | 2017-08-10 | 2019-02-26 | 淮安市水泥厂有限公司 | A kind of industrial residue saltcake is used as the processing method of cement ingredient |
| CN110127628A (en) * | 2019-04-23 | 2019-08-16 | 中国中轻国际工程有限公司 | A kind of tank furnace formula vulcanized sodium industrialized production equipment and technique |
| CN113896208A (en) * | 2020-07-06 | 2022-01-07 | 浙江龙盛集团股份有限公司 | Method for treating industrial mixed waste salt by using sulfuric acid |
| CN112028031A (en) * | 2020-08-04 | 2020-12-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for preparing sodium sulfide by melting reduction of industrial sodium sulfate |
| CN112320767A (en) * | 2020-10-30 | 2021-02-05 | 金川集团股份有限公司 | Novel electric furnace and process method for producing high-purity sodium sulfide |
| CN112573539A (en) * | 2020-12-30 | 2021-03-30 | 广西天源新能源材料有限公司 | Preparation method of anhydrous sodium sulphate based on lithium polymer and spodumene |
| CN113501534A (en) * | 2021-07-20 | 2021-10-15 | 浙江红狮环保股份有限公司 | Method for resource utilization of sodium sulfate waste salt |
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Application publication date: 20220624 |