CN117070693A - Refining slag method for producing ferroalloy by steel slag aluminothermic reduction - Google Patents
Refining slag method for producing ferroalloy by steel slag aluminothermic reduction Download PDFInfo
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- CN117070693A CN117070693A CN202310898608.XA CN202310898608A CN117070693A CN 117070693 A CN117070693 A CN 117070693A CN 202310898608 A CN202310898608 A CN 202310898608A CN 117070693 A CN117070693 A CN 117070693A
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- China
- Prior art keywords
- slag
- steel slag
- reducing agent
- refining
- gas system
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- 239000002893 slag Substances 0.000 title claims abstract description 106
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 238000007670 refining Methods 0.000 title claims abstract description 36
- 229910001021 Ferroalloy Inorganic materials 0.000 title claims abstract description 22
- 230000009467 reduction Effects 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 30
- 238000006722 reduction reaction Methods 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 11
- 239000011574 phosphorus Substances 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 7
- 239000001257 hydrogen Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000007885 magnetic separation Methods 0.000 claims description 3
- 238000000053 physical method Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000011027 product recovery Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000003832 thermite Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- 239000011593 sulfur Substances 0.000 abstract description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B15/00—Other processes for the manufacture of iron from iron compounds
- C21B15/02—Metallothermic processes, e.g. thermit reduction
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of ferroalloy, in particular to a refining slag method for producing ferroalloy by aluminum thermal reduction of steel slag, which comprises the following steps: pretreating steel slag; stirring; and (3) introducing a reducing agent: introducing a proper amount of reducing agent into the steel slag to reduce oxides in the slag, wherein the reducing agent can be metal powder with stronger reducing capability, such as aluminum powder or magnesium powder; gas system: the thermal reduction reaction is carried out by controlling the atmosphere and introducing a gas system, wherein the commonly used gas system comprises nitrogen, hydrogen or inert gas and the like, and the selection of the gas system is adjusted according to different reaction conditions so as to achieve the optimal reaction effect; forming refining slag; recovering products; the invention forms a novel refining slag by introducing specific reducing agent and gas system, can efficiently remove impurities in slag removal, improves the quality and yield of ferroalloy, can reduce the content of harmful elements such as sulfur, phosphorus and the like in slag, and improves the recycling rate of steel slag.
Description
Technical Field
The invention relates to the technical field of ferroalloy, in particular to a refining slag method for producing ferroalloy by aluminum thermal reduction of steel slag.
Background
The steel slag is metallurgical waste slag generated in the steel production process, contains a large amount of oxides and impurities, causes environmental pollution, and has limited recycling value; the thermit reduction of steel slag is a common treatment method, and the oxide in the steel slag is reduced into metallic iron by carrying out high-temperature reduction reaction on the steel slag and aluminum powder, and forms iron alloy with the aluminum. However, the existing aluminum reduction method for steel slag has the problem that impurities in slag are not thoroughly removed, and the quality and yield of ferroalloy are limited.
Disclosure of Invention
The invention aims to provide a refining slag method for producing ferroalloy by aluminum reduction of steel slag, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a refining slag method for producing ferroalloy by steel slag aluminothermic reduction comprises the following steps:
s1, preprocessing steel slag: grinding the collected steel slag to ensure that the granularity of the steel slag is uniform and consistent, and improving the reaction effect;
s2, stirring treatment: adding steel slag with uniform granularity into a reactor, stirring and reducing for a period of time according to the granularity of the steel slag, settling the reduced phosphorus-containing molten iron to the bottom of the reactor, floating slag on the upper layer of the phosphorus-containing molten iron, and condensing and collecting part of generated phosphorus steam;
s3, introducing a reducing agent: introducing a proper amount of reducing agent into the steel slag to reduce oxides in the slag, wherein the reducing agent can be metal powder with stronger reducing capability, such as aluminum powder or magnesium powder;
s4, gas system: the thermal reduction reaction is carried out by controlling the atmosphere and introducing a gas system, wherein the commonly used gas system comprises nitrogen, hydrogen or inert gas and the like, and the selection of the gas system is adjusted according to different reaction conditions so as to achieve the optimal reaction effect;
s5, forming refining slag: in the thermit reduction reaction process, the reducing agent reacts with oxides in the steel slag to form novel refining slag, and the refining slag has good fluidity and adsorption capacity, can effectively remove impurities in slag removal, and improves the quality of ferroalloy;
s6, product recovery: after the thermite reduction reaction, the obtained ferroalloy is separated from refining slag by a physical method, and common separation methods comprise magnetic separation, gravity separation and the like, and separation can also be carried out by adopting floatation and other methods so as to realize recycling of products.
Preferably, in the step S1, the steel slag pretreatment can be performed by adopting mechanical crushing equipment, such as a ball mill, a hammer crusher and the like, or can be performed by adopting a chemical method to perform decomposition treatment, so that the granularity uniformity of the steel slag is improved, and the steel slag subjected to grinding treatment is treated by utilizing a classification screening device.
Preferably, in the step S3, a proper introduction amount of the reducing agent is selected according to the content of oxides in the slag and the reaction requirement, and the reducing agent can be selected from metal powder with stronger reducing capability such as aluminum powder, magnesium powder and the like, or can be a composite reducing agent and the like.
Preferably, in step S4, an appropriate atmosphere and gas system are selected according to the reaction temperature and environment, and a commonly used gas system includes nitrogen, hydrogen or inert gas, etc., and the flow and distribution of the gas in the reaction are controlled by adjusting the introduction rate of the atmosphere and gas, so as to ensure the smooth progress of the reaction.
Preferably, in the step S5, in the thermit reduction reaction process, the reducing agent reacts with oxides in the steel slag to form refining slag, and the refining slag can be adjusted by controlling parameters such as the introduction rate of the reducing agent, the reaction temperature and the like so as to obtain a refining effect meeting the requirements.
Compared with the prior art, the invention has the beneficial effects that:
1. the method has the advantages that the special reducing agent and a gas system are introduced to form novel refining slag, impurities in slag can be removed efficiently, the quality and the yield of iron alloy are improved, the content of harmful elements such as sulfur, phosphorus and the like in the slag can be reduced, and the recycling rate of steel slag is improved.
Drawings
FIG. 1 is a schematic diagram of the operational flow of the present invention;
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
A refining slag method for producing ferroalloy by steel slag aluminothermic reduction comprises the following steps:
s1, preprocessing steel slag: grinding the collected steel slag to ensure that the granularity of the steel slag is uniform and consistent, and improving the reaction effect;
s2, stirring treatment: adding steel slag with uniform granularity into a reactor, stirring and reducing for a period of time according to the granularity of the steel slag, settling the reduced phosphorus-containing molten iron to the bottom of the reactor, floating slag on the upper layer of the phosphorus-containing molten iron, and condensing and collecting part of generated phosphorus steam;
s3, introducing a reducing agent: introducing a proper amount of reducing agent into the steel slag to reduce oxides in the slag, wherein the reducing agent can be metal powder with stronger reducing capability, such as aluminum powder or magnesium powder;
s4, gas system: the thermal reduction reaction is carried out by controlling the atmosphere and introducing a gas system, wherein the commonly used gas system comprises nitrogen, hydrogen or inert gas and the like, and the selection of the gas system is adjusted according to different reaction conditions so as to achieve the optimal reaction effect;
s5, forming refining slag: in the thermit reduction reaction process, the reducing agent reacts with oxides in the steel slag to form novel refining slag, and the refining slag has good fluidity and adsorption capacity, can effectively remove impurities in slag removal, and improves the quality of ferroalloy;
s6, product recovery: after the thermite reduction reaction, the obtained ferroalloy is separated from refining slag by a physical method, and common separation methods comprise magnetic separation, gravity separation and the like, and separation can also be carried out by adopting floatation and other methods so as to realize recycling of products.
In this embodiment, in the step S1, the steel slag pretreatment may be performed by using mechanical crushing devices, such as a ball mill, a hammer crusher, or a chemical method, or the decomposition treatment may be performed to improve the granularity uniformity of the steel slag, and the classification screening device may be used to treat the ground steel slag.
In this embodiment, in step S3, a suitable introduction amount of the reducing agent is selected according to the content of the oxide in the slag and the reaction requirement, and the reducing agent may be selected from metal powder with a relatively strong reducing ability, such as aluminum powder, magnesium powder, or a composite reducing agent.
In this embodiment, in step S4, an appropriate atmosphere and gas system are selected according to the reaction temperature and environment, and the commonly used gas system includes nitrogen, hydrogen or inert gas, etc., and the flow and distribution of the gas in the reaction are controlled by adjusting the introduction rate of the atmosphere and gas, so as to ensure the smooth progress of the reaction.
In this embodiment, in the thermit reduction reaction in step S5, the reducing agent reacts with the oxide in the steel slag to form a refining slag, and the refining slag can be adjusted by controlling parameters such as the introduction rate of the reducing agent and the reaction temperature, so as to obtain a refining effect meeting the requirements.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A refining slag method for producing ferroalloy by steel slag aluminothermic reduction is characterized by comprising the following steps:
s1, preprocessing steel slag: grinding the collected steel slag to ensure that the granularity of the steel slag is uniform and consistent, and improving the reaction effect;
s2, stirring treatment: adding steel slag with uniform granularity into a reactor, stirring and reducing for a period of time according to the granularity of the steel slag, settling the reduced phosphorus-containing molten iron to the bottom of the reactor, floating slag on the upper layer of the phosphorus-containing molten iron, and condensing and collecting part of generated phosphorus steam;
s3, introducing a reducing agent: introducing a proper amount of reducing agent into the steel slag to reduce oxides in the slag, wherein the reducing agent can be metal powder with stronger reducing capability, such as aluminum powder or magnesium powder;
s4, gas system: the thermal reduction reaction is carried out by controlling the atmosphere and introducing a gas system, wherein the commonly used gas system comprises nitrogen, hydrogen or inert gas and the like, and the selection of the gas system is adjusted according to different reaction conditions so as to achieve the optimal reaction effect;
s5, forming refining slag: in the thermit reduction reaction process, the reducing agent reacts with oxides in the steel slag to form novel refining slag, and the refining slag has good fluidity and adsorption capacity, can effectively remove impurities in slag removal, and improves the quality of ferroalloy;
s6, product recovery: after the thermite reduction reaction, the obtained ferroalloy is separated from refining slag by a physical method, and common separation methods comprise magnetic separation, gravity separation and the like, and separation can also be carried out by adopting floatation and other methods so as to realize recycling of products.
2. The refining slag method for producing ferroalloy by aluminothermic reduction of steel slag according to claim 1, wherein in the step S1, the steel slag pretreatment can be performed by mechanical crushing equipment such as ball mill, hammer crusher, etc., or decomposition treatment can be performed by chemical method, so as to improve the granularity uniformity of the steel slag and treat the ground steel slag by using classification screening equipment.
3. The refining slag method for producing ferroalloy by aluminothermic reduction of steel slag according to claim 1, wherein in step S3, a suitable introduction amount of a reducing agent is selected according to the content of oxides in slag and the reaction requirement, and the reducing agent can be selected from metal powder with stronger reducing ability such as aluminum powder, magnesium powder and the like, and can also be a composite reducing agent and the like.
4. The refining slag method for producing ferroalloy by aluminothermic reduction of steel slag according to claim 1, wherein in step S4, proper atmosphere and gas system are selected according to reaction temperature and environment, and common gas system comprises nitrogen, hydrogen or inert gas, etc., and the flow and distribution of gas in the reaction are controlled by adjusting the introducing rate of atmosphere and gas, so as to ensure smooth progress of the reaction.
5. The method for producing ferroalloy refining slag by aluminothermic reduction of steel slag according to claim 1, wherein in the step S5, in the aluminothermic reduction reaction process, the reducing agent reacts with oxides in the steel slag to form refining slag, and the refining slag can be adjusted by controlling parameters such as the introduction rate of the reducing agent and the reaction temperature, so as to obtain a satisfactory refining effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310898608.XA CN117070693A (en) | 2023-07-21 | 2023-07-21 | Refining slag method for producing ferroalloy by steel slag aluminothermic reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310898608.XA CN117070693A (en) | 2023-07-21 | 2023-07-21 | Refining slag method for producing ferroalloy by steel slag aluminothermic reduction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117070693A true CN117070693A (en) | 2023-11-17 |
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| CN202310898608.XA Pending CN117070693A (en) | 2023-07-21 | 2023-07-21 | Refining slag method for producing ferroalloy by steel slag aluminothermic reduction |
Country Status (1)
| Country | Link |
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| CN (1) | CN117070693A (en) |
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2023
- 2023-07-21 CN CN202310898608.XA patent/CN117070693A/en active Pending
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