CN112708756A - Process for producing steelmaking fluxing composite slag melting agent by using chemical fluorine mud - Google Patents
Process for producing steelmaking fluxing composite slag melting agent by using chemical fluorine mud Download PDFInfo
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- CN112708756A CN112708756A CN202011476955.6A CN202011476955A CN112708756A CN 112708756 A CN112708756 A CN 112708756A CN 202011476955 A CN202011476955 A CN 202011476955A CN 112708756 A CN112708756 A CN 112708756A
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- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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- 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
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- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a process for producing a steelmaking fluxing composite slag melting agent by utilizing chemical fluorine mud, and relates to the technical field of slag melting agent preparation. The method comprises the following steps: the method comprises the following steps: preparing raw materials: drying chemical fluorine mud in a roller dryer, removing water for later use, then uniformly mixing the dried fluorine mud with calcium fluoride powder as a main component through a stirrer for later use, and performing the second step: mixing auxiliary materials: adding 5-10% of sodium carbonate and 2-4% of adhesive into the mixed fluorine mud powder, and preparing the mixture into pellets of 20-50 mm by a high-pressure ball mill for later use. When the steel is used, 0.5-2 kg of finished products are added into each ton of molten steel according to actual use conditions, so that the melting point of steel making can be effectively reduced by calcium fluoride in the finished products, the energy consumption for melting iron ores or recovering metals is further obviously reduced, the environmental protection and the economical efficiency are improved, and then in the subsequent use process, chemical by-products are recycled, so that the toxic substances can be further treated and recycled.
Description
Technical Field
The invention relates to the technical field of preparation of slag melting agents, in particular to a process for producing a steelmaking fluxing composite slag melting agent by utilizing chemical fluorine mud.
Background
Photovoltaic enterprises, special glass enterprises, inorganic and organic fluorine chemical industry production enterprises and production processes discharge a large amount of fluorine-containing wastewater, main pollutants of the wastewater are fluorine ions and suspended matters, the wastewater treatment mainly comprises the steps of adding calcium oxide and calcium carbonate for neutralization and then precipitating with a flocculating agent, most of generated sludge is calcium fluoride, silicon dioxide, calcium carbonate and the like, most of the existing slag melting agents are prepared by mixing iron oxide and aluminum-containing compounds, and the melting point of iron ore or recovered metal is reduced.
However, most of the existing slag melting agents are prepared, in order to pursue the efficiency of reducing the melting point in unit time, a large amount of sludge needing to be treated in advance is ignored, the actual utilization efficiency is not high, the sludge is not treated, the actual environmental pollution and the economic benefit are easily reduced, and secondly, in the using process, the efficiency of reducing the melting point is not high, the acting time is short, the economic benefit is not improved, and the using amount of the slag melting agent is reduced.
Disclosure of Invention
The invention aims to provide a process for producing a steelmaking fluxing composite slag melting agent by using chemical fluorine mud. When the steel is used, 0.5-2 kg of finished products are added into each ton of molten steel according to actual use conditions, so that the melting point of steel making can be effectively reduced by calcium fluoride in the finished products, the energy consumption for melting iron ores or recovering metals is further obviously reduced, the environmental protection and the economical efficiency are improved, and then in the subsequent use process, chemical by-products are recycled, so that the toxic substances can be further treated and recycled.
In order to solve the problems of poor environment-friendly performance and low structural strength, the invention provides the following technical scheme: a process for producing a steelmaking fluxing composite slag melting agent by using chemical fluorine sludge comprises the following steps:
the method comprises the following steps: preparing raw materials: drying chemical fluorine mud in a roller dryer to remove water for later use, and then uniformly mixing the dried fluorine mud, the main component of which is calcium fluoride powder, by a stirrer for later use.
Step two: mixing auxiliary materials: adding 5-10% of sodium carbonate and 2-4% of adhesive into the mixed fluorine mud powder, and preparing the mixture into pellets of 20-50 mm by a high-pressure ball mill for later use.
Step three: sintering treatment: sintering the prepared pellets in a rotary kiln at 800-1000 ℃ for later use.
Step four: and (3) crushing treatment: and crushing the sintered pellets into powder of 1-3 mm by a hammer crusher for later use.
Step five: customizing: adding 10-70% of electrolyte powder treated by an electrolytic aluminum plant into the calcium fluoride powder after sintering treatment according to different requirements of a steel mill, and further pressing the calcium fluoride powder into pellets of 5-50 mm by a high-pressure ball machine.
Further, the method comprises the following steps: according to the operation steps in the first step, the chemical fluorine sludge is divided into sludge produced by organic fluorine chemical industry and sludge produced by inorganic fluorine chemical industry, the water content of the sludge produced by the inorganic fluorine chemical industry is 35-60%, and the water content of the sludge produced by the organic fluorine chemical industry is 40-65%.
Further, the method comprises the following steps: according to the operation step in the first step, the calcium fluoride content of the sludge produced by the organic fluorine chemical industry and the sludge produced by the inorganic fluorine chemical industry needs to be kept above 55 percent.
Further, the method comprises the following steps: according to the operation step in the second step, the heavy oil is adopted as the main component of the 2% -4% adhesive.
Further, the method comprises the following steps: and according to the operation steps in the second step, spraying a proper amount of adhesive diluent on the pellets before sintering.
Further, the method comprises the following steps: according to the operation steps in the third step, when the pellets are sintered in the rotary kiln, the sintering time needs to reach 2 hours, and the pellets are ensured not to crack.
Further, the method comprises the following steps: according to the operation steps in the third step, the sintering temperature is increased by 110 ℃ per minute until the sintering temperature is increased to 800-1000 ℃.
Further, the method comprises the following steps: according to the operation steps in the fourth step, after the pellets are crushed, screening the crushed pellets through a screen, and crushing the part of the crushed pellets with unqualified diameter through a hammer crusher again.
Further, the method comprises the following steps: according to the operation step in the fifth step, the electrolyte powder mainly contains Na3AlF6。
Further, the method comprises the following steps: and according to the operation steps in the fifth step, spraying a heavy oil adhesive on the outer wall of the pellet subjected to the customized treatment for treatment before storage.
The invention provides a process for producing a steelmaking fluxing composite slag melting agent by using chemical fluorine sludge, which has the following beneficial effects: when the steel is used, 0.5-2 kg of finished products are added into each ton of molten steel according to actual use conditions, so that the melting point of steel making can be effectively reduced by calcium fluoride in the finished products, the energy consumption for melting iron ores or recovering metals is further obviously reduced, the environmental protection and the economical efficiency are improved, and then in the subsequent use process, chemical by-products are recycled, so that the toxic substances can be further treated and recycled.
Drawings
FIG. 1 is a flow chart of the process for producing the steelmaking fluxing composite slag melting agent by using the chemical fluorine sludge.
Detailed Description
Referring to fig. 1, the present invention provides a technical solution: a process for producing a steelmaking fluxing composite slag melting agent by using chemical fluorine sludge comprises the following steps:
the method comprises the following steps: preparing raw materials: drying chemical fluorine mud in a roller dryer to remove water for later use, and then uniformly mixing the dried fluorine mud, the main component of which is calcium fluoride powder, by a stirrer for later use.
Step two: mixing auxiliary materials: adding 5-10% of sodium carbonate and 2-4% of adhesive into the mixed fluorine mud powder, and preparing the mixture into pellets of 20-50 mm by a high-pressure ball mill for later use.
Step three: sintering treatment: sintering the prepared pellets in a rotary kiln at 800-1000 ℃ for later use.
Step four: and (3) crushing treatment: and crushing the sintered pellets into powder of 1-3 mm by a hammer crusher for later use.
Step five: customizing: adding 10-70% of electrolyte powder treated by an electrolytic aluminum plant into the calcium fluoride powder after sintering treatment according to different requirements of a steel mill, and further pressing the calcium fluoride powder into pellets of 5-50 mm by a high-pressure ball machine.
Specifically, the method comprises the following steps: according to the operation steps in the first step, the chemical fluorine sludge is divided into sludge produced by an organic fluorine chemical industry and sludge produced by an inorganic fluorine chemical industry, the water content of the sludge produced by the inorganic fluorine chemical industry is 35-60%, and the water content of the sludge produced by the organic fluorine chemical industry is 40-65%.
Specifically, the method comprises the following steps: according to the operation steps in the first step, the calcium fluoride content of the sludge produced by the organic fluorine chemical industry and the sludge produced by the inorganic fluorine chemical industry needs to be kept above 55 percent.
Specifically, the method comprises the following steps: according to the operation step in the second step, 2% -4% of the main component of the adhesive is heavy oil.
Specifically, the method comprises the following steps: and according to the operation steps in the second step, spraying a proper amount of adhesive diluent before sintering the pellets.
Specifically, the method comprises the following steps: according to the operation steps in the third step, when the pellets are sintered in the rotary kiln, the sintering time needs to reach 2 hours, and the pellets are ensured not to crack.
Specifically, the method comprises the following steps: according to the operation steps in the third step, the sintering temperature is increased by 110 ℃ per minute until the sintering temperature is increased to 800-1000 ℃.
Specifically, the method comprises the following steps: according to the operation steps in the fourth step, after the pellets are crushed, screening the crushed pellets through a screen, and crushing the part of the crushed pellets with unqualified diameter through a hammer crusher again.
Specifically, the method comprises the following steps: according to the operation step in the fifth step, the main component of the electrolyte powder is Na3AlF6。
Specifically, the method comprises the following steps: and according to the operation steps in the fifth step, spraying a heavy oil adhesive on the outer wall of the pellet subjected to customized treatment for treatment before storage.
The method of the examples was performed for detection analysis and compared to the prior art to yield the following data:
| slagging efficiency | Efficiency of utilization | |
| Examples | Is higher than | Is higher than |
| Prior Art | Is lower than | Is lower than |
The method of the examples was performed for data detection analysis and compared to the existing data to yield the following data:
| time of slag melting | Efficiency of utilization | Unit time | |
| Examples | 12H | 89% | 24H |
| Prior Art | 5H | 65% | 24H |
According to the table data, when the embodiment is used, the process for producing the steelmaking fluxing composite slagging agent by using the chemical fluorine mud further reduces the duration and the efficiency of the melting point of the slagging agent, and improves the efficiency of recycling the wastes of other overall chemical products.
The invention provides a process for producing a steelmaking fluxing composite slag melting agent by using chemical fluorine mud, which comprises the following steps: the method comprises the following steps: preparing raw materials: the chemical industry fluorine mud is dried in a roller dryer to remove water for later use, then the dried fluorine mud is mainly composed of calcium fluoride powder and is uniformly mixed by a stirrer for later use, the chemical industry fluorine mud is divided into sludge produced by organic fluorine chemical industry and sludge produced by inorganic fluorine chemical industry, the water content of the sludge produced by inorganic fluorine chemical industry is 35-60%, the water content of the sludge produced by organic fluorine chemical industry is 40-65%, the calcium fluoride content of the sludge produced by organic fluorine chemical industry and the calcium fluoride content of the sludge produced by inorganic fluorine chemical industry need to be kept above 55%, the sludge produced by organic fluorine chemical industry and the sludge produced by inorganic fluorine chemical industry are dehydrated, the toxic calcium fluoride can be collected and reused, the environmental pollution caused by the sludge containing fluorine is avoided, the recycling efficiency of the produced by-products is improved, the calcium fluoride is slightly soluble in water, has low toxicity, is easily absorbed by plants, is harmful to soil when directly buried, can cause the concentration of fluoride in surface water to be increased, and causes fluorine in underground waterThe content exceeds the standard, and further threatens plant generation and human health, and the second step is that: mixing auxiliary materials: adding 5% -10% of sodium carbonate and 2% -4% of adhesive into the mixed fluorine sludge powder, preparing pellets of 20-50 mm for later use by a high-pressure ball mill, wherein the main component of the 2% -4% of adhesive adopts heavy oil, and before sintering, the pellets are sprayed with a proper amount of adhesive diluent, mainly using the low melting point of calcium fluoride to break the network structure of silicon dioxide and assist lime to be melted into slag to form silicate with smaller molecular bonds, thereby improving the fluidity of the slag, reducing the smelting temperature and saving the energy consumption, but because the sources and the qualities of the fluorine sludge are different, homogenization and optimization treatment are carried out to meet the condition of becoming a fluxing slag agent, and the third step is that: sintering treatment: sintering the prepared pellets at the temperature of 800 ℃ plus 1000 ℃ in a rotary kiln for later use, wherein when the pellets are sintered in the rotary kiln, the sintering time needs to reach 2 hours, and the pellets are ensured not to crack, the sintering temperature rises by 110 ℃ per minute until the sintering temperature rises by 800 ℃ plus 1000 ℃, and the step four is as follows: and (3) crushing treatment: the pellet after the sintering treatment is crushed into powder of 1-3 mm through the hammer crusher for standby, the crushed pellet is screened through the screen after being crushed, the unqualified part of the crushed diameter of the pellet is crushed through the hammer crusher again, the reaction efficiency of the product can be accelerated through improving the external surface contact area of the product, the energy consumption of heating is further reduced, and the step is five: customizing: adding 10-70% of electrolyte powder treated by an electrolytic aluminum plant into the sintered calcium fluoride powder according to different requirements of a steel mill, and further pressing the mixture into 5-50 mm pellets by a high-pressure ball machine, wherein the main component of the electrolyte powder is Na3AlF6The outer wall of the pellet subjected to customized treatment is sprayed with the heavy oil adhesive for storage, different quality requirements of a manufacturer on the slag melting agent can be met by adding electrolyte powder, the melting point reduction efficiency of the slag melting agent can be further improved by an aluminum-containing compound, a final product is adjusted according to the requirement of the manufacturer, a group A, a group B and a group C are obtained by component analysis, three high-performance slag melting agents can be applied to the requirements of the slag melting agent with different requirements, and the specific components are as follows: group A: caF2：70-85% 、SiO2：10% 、NaCO3：5-10% 、MgO ：5-8%；
The component B is CaF250-65%、SiO2：7% 、Na3AlF6: 20 to 30 percent; the component C is F: 25-45% of CaF2：25-45% 、Na：5-20% 、Al：5-15% 、MgO：5-10%。
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A process for producing a steelmaking fluxing composite slag melting agent by using chemical fluorine mud is characterized by comprising the following steps:
the method comprises the following steps: preparing raw materials: drying chemical fluorine mud in a roller dryer to remove water for later use, and then uniformly mixing the dried fluorine mud, the main component of which is calcium fluoride powder, by a stirrer for later use;
step two: mixing auxiliary materials: adding 5-10% of sodium carbonate and 2-4% of adhesive into the mixed fluorine sludge powder, and preparing the mixture into pellets of 20-50 mm by a high-pressure ball mill for later use;
step three: sintering treatment: sintering the prepared pellets in a rotary kiln at 800 ℃ and 1000 ℃ for later use;
step four: and (3) crushing treatment: crushing the sintered pellets into powder of 1-3 mm by a hammer crusher for later use;
step five: customizing: adding 10-70% of electrolyte powder treated by an electrolytic aluminum plant into the calcium fluoride powder after sintering treatment according to different requirements of a steel mill, and further pressing the calcium fluoride powder into pellets of 5-50 mm by a high-pressure ball machine.
2. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: according to the operation steps in the first step, the chemical fluorine sludge is divided into sludge produced by organic fluorine chemical industry and sludge produced by inorganic fluorine chemical industry, the water content of the sludge produced by the inorganic fluorine chemical industry is 35-60%, and the water content of the sludge produced by the organic fluorine chemical industry is 40-65%.
3. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: according to the operation step in the first step, the calcium fluoride content of the sludge produced by the organic fluorine chemical industry and the sludge produced by the inorganic fluorine chemical industry needs to be kept above 55 percent.
4. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: according to the operation step in the second step, the heavy oil is adopted as the main component of the 2% -4% adhesive.
5. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: and according to the operation steps in the second step, spraying a proper amount of adhesive diluent on the pellets before sintering.
6. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: according to the operation steps in the third step, when the pellets are sintered in the rotary kiln, the sintering time needs to reach 2 hours, and the pellets are ensured not to crack.
7. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: according to the operation steps in the third step, the sintering temperature is increased by 110 ℃ per minute until the sintering temperature is increased to 800-1000 ℃.
8. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: according to the operation steps in the fourth step, after the pellets are crushed, screening the crushed pellets through a screen, and crushing the part of the crushed pellets with unqualified diameter through a hammer crusher again.
9. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: according to the operation step in the fifth step, the electrolyte powder mainly contains Na3AlF6。
10. The process for producing the steelmaking fluxing and composite slag melting agent by using the chemical fluorine sludge as claimed in claim 1, is characterized by comprising the following steps: and according to the operation steps in the fifth step, spraying a heavy oil adhesive on the outer wall of the pellet subjected to the customized treatment for treatment before storage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115449600A (en) * | 2021-10-08 | 2022-12-09 | 武汉山诚环保科技有限公司 | Novel steelmaking mixed fluxing agent and preparation method and application thereof |
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Cited By (1)
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|---|---|---|---|---|
| CN115449600A (en) * | 2021-10-08 | 2022-12-09 | 武汉山诚环保科技有限公司 | Novel steelmaking mixed fluxing agent and preparation method and application thereof |
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