CN110373515B - Magnesium-based desulfurizer for pretreatment and passivation of steelmaking molten iron and preparation method thereof - Google Patents
Magnesium-based desulfurizer for pretreatment and passivation of steelmaking molten iron and preparation method thereof Download PDFInfo
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- CN110373515B CN110373515B CN201910595441.3A CN201910595441A CN110373515B CN 110373515 B CN110373515 B CN 110373515B CN 201910595441 A CN201910595441 A CN 201910595441A CN 110373515 B CN110373515 B CN 110373515B
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- magnesium
- molten iron
- sulfur content
- passivated
- calcium oxide
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
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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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses passivated magnesium for pretreatment of steelmaking molten ironThe desulfurizing agent comprises the following chemical components in percentage by weight: 2-25%, CaF20-9 percent, and the balance of CaO and inevitable impurities, the invention can greatly reduce the consumption of metal magnesium in mixed injection and simultaneously improve the hit rate of the deep desulfurization end point.
Description
Technical Field
The invention belongs to the external refining technology of steel making furnaces, and particularly relates to a magnesium-based desulfurizing agent for pretreatment of steelmaking water and a preparation method thereof.
Background
In the process of steelmaking, the cost of molten iron pretreatment desulfurization is far lower than that of steelmaking converter desulfurization, so the molten iron pretreatment desulfurization process is widely applied, and the main methods of the pretreatment desulfurization at home and abroad at present comprise a KR method, a blowing method, a rotary drum, a shaking ladle and the like, wherein the blowing method is already the main method of the molten iron pretreatment desulfurization, and the blowing method is divided into composite blowing and mixed blowing, and the composite blowing and the mixed blowing have advantages.
The invention is developed aiming at the problem that the deep desulfurization in the mixed injection process is difficult to control, can well adapt to the injection desulfurization requirement ball of a steel mill according to the molten iron condition of the steel mill, the condition of an iron ladle and the performance setting of injection equipment, greatly reduces the consumption of metal magnesium in the mixed injection, and simultaneously improves the hit rate of the deep desulfurization end point.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a magnesium-based desulfurizer for pretreating steelmaking molten iron and steel and a preparation method thereof, aiming at the defects in the prior art, so that the magnesium-based desulfurizer can well meet the requirement of blowing desulfurization in a steel mill, greatly reduce the consumption of metal magnesium in mixed blowing, and simultaneously improve the hit rate of a deep desulfurization end point.
The technical scheme for solving the technical problems is as follows: a magnesium-base desulfurizing agent for pretreating the iron-smelting steel and iron-smelting steelThe chemical components of the agent in percentage by weight are as follows: 2-25%, CaF20-9%, and the balance of CaO and inevitable impurities.
The invention also provides a preparation method of the magnesium-based desulfurizer for pretreating steelmaking water to passivate, which comprises the following steps:
determining the dosage of metal magnesium according to the difference value of the sulfur content when the pure lime desulfurization changes an inflection point along with the time extension desulfurization rate and the target sulfur content, namely: (sulfur content at inflection point of change of desulfurization rate-target sulfur content) × molten iron amount/magnesium utilization rate;
secondly, determining the content of calcium fluoride according to the silicon content, the sulfur content and the temperature condition in the molten iron, and meanwhile, smoothly slagging off or dragging slag by slag-off equipment, wherein the desulfurized slag is moderate in dryness and dilution;
(III) determining the content of calcium oxide according to the initial average sulfur content of the molten iron, namely: (initial average sulfur content of molten iron-sulfur content at inflection point of desulfurization rate change of pure lime) x molten iron amount/calcium oxide utilization rate;
and (IV) introducing the magnesium metal in the step one in a passivated magnesium form, wherein the content percentage of the passivated magnesium is determined as follows: the magnesium metal amount determined in the step (one)/(the calcium oxide amount determined in the step (three))/(the calcium fluoride amount determined in the step (two)) × 100%;
and (V) uniformly mixing the passivated magnesium, the calcium fluoride and the lime and then packaging.
The invention further defines the scheme:
the blocking time of the passivated magnesium is required to be more than or equal to 20s, the Mg is required to be more than or equal to 90 percent, and the repose angle is required to be less than or equal to 30 degrees.
The calcium fluoride is introduced by fluorite, and the fluorite is ground into 200-mesh fine powder by a Raymond mill.
The calcium oxide is introduced by adopting passivated calcium oxide, and the passivated calcium oxide is ground into fine powder by a Raymond mill, wherein the particle size is 0.004-1 mm.
The invention has the beneficial effects that: 1. the process is simplified; 2. the dosage of the desulfurization powder is reduced; 3. the desulfurization depth can be controlled.
Detailed Description
Example 1
The embodiment provides a magnesium-based desulfurizer for pretreating steelmaking liquid and passivating the steelmaking liquid, which comprises the following chemical components in percentage by weight: 3.5%, CaF 2: 4.5%, CaO: 81% and the balance unavoidable impurities.
The embodiment provides a preparation method of a magnesium-based desulfurizer for pretreating steelmaking water, which specifically comprises the following steps:
determining the dosage of metal magnesium according to the difference value of the sulfur content when the pure lime desulfurization changes an inflection point along with the time extension desulfurization rate and the target sulfur content, namely: (sulfur content at inflection point of change of desulfurization rate-target sulfur content) × molten iron amount/magnesium utilization rate;
determining the content of calcium fluoride, namely determining according to the silicon content, the sulfur content and the temperature condition in molten iron, and meanwhile, smoothly skimming or salvaging slag by skimming equipment, wherein the desulfurized slag is moderate in dryness and dilution, the calcium fluoride is introduced by fluorite, and the fluorite is ground into 200-mesh fine powder by a Raymond mill;
(III) determining the content of calcium oxide according to the initial average sulfur content of the molten iron, namely: (initial average sulfur content of molten iron-sulfur content at inflection point of desulfurization rate of pure lime) x amount of molten iron/utilization rate of calcium oxide, wherein the calcium oxide is introduced by using passivated calcium oxide, and the passivated calcium oxide is ground into fine powder with a particle size of 0.094mm by a Raymond mill
And (IV) introducing the magnesium metal in the step one in a passivated magnesium form, wherein the content percentage of the passivated magnesium is determined as follows: the ratio of the amount of magnesium metal determined in the step (one)/the amount of magnesium metal determined in the step (one) + the amount of calcium oxide determined in the step (three) + the amount of calcium fluoride determined in the step (two) × 100%, while the blocking time required for passivating magnesium is 30s, Mg: 93%, angle of repose 26 °;
And (V) uniformly mixing the passivated magnesium, fluorite and passivated calcium oxide and then packaging.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (1)
1. A preparation method of a magnesium-based desulfurizer for pretreating steelmaking molten iron is characterized in that the desulfurizer comprises the following chemical components in percentage by weight: 3.5%, CaF 2: 4.5%, CaO: 81%, the balance being unavoidable impurities; the preparation method of the passivated magnesium-based desulfurizing agent specifically comprises the following steps:
determining the dosage of metal magnesium according to the difference value of the sulfur content when the pure lime desulfurization changes an inflection point along with the time extension desulfurization rate and the target sulfur content, namely: (sulfur content at inflection point of change of desulfurization rate-target sulfur content) × molten iron amount/magnesium utilization rate;
determining the content of calcium fluoride, namely determining according to the silicon content, the sulfur content and the temperature condition in molten iron, and meanwhile, smoothly skimming or salvaging slag by skimming equipment, wherein the desulfurized slag is moderate in dryness and dilution, the calcium fluoride is introduced by fluorite, and the fluorite is ground into 200-mesh fine powder by a Raymond mill;
(III) determining the content of calcium oxide according to the initial average sulfur content of the molten iron, namely: (initial average sulfur content of molten iron-sulfur content at inflection point of desulfurization rate of pure lime) x amount of molten iron/utilization rate of calcium oxide, the calcium oxide is introduced by using passivated calcium oxide, the passivated calcium oxide is ground into fine powder by Raymond mill, and the particle size is 0.094mm
And (IV) introducing the magnesium metal in the step one in a passivated magnesium form, wherein the content percentage of the passivated magnesium is determined as follows: the ratio of the amount of magnesium metal determined in the step (one)/the amount of magnesium metal determined in the step (one) + the amount of calcium oxide determined in the step (three) + the amount of calcium fluoride determined in the step (two) × 100%, while the blocking time required for passivating magnesium is 30s, Mg: 93%, angle of repose 26 °;
and (V) uniformly mixing the passivated magnesium, fluorite and passivated calcium oxide and then packaging.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910595441.3A CN110373515B (en) | 2019-07-03 | 2019-07-03 | Magnesium-based desulfurizer for pretreatment and passivation of steelmaking molten iron and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910595441.3A CN110373515B (en) | 2019-07-03 | 2019-07-03 | Magnesium-based desulfurizer for pretreatment and passivation of steelmaking molten iron and preparation method thereof |
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| Publication Number | Publication Date |
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| CN110373515A CN110373515A (en) | 2019-10-25 |
| CN110373515B true CN110373515B (en) | 2022-05-03 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294200A (en) * | 1999-11-02 | 2001-05-09 | 北京科技大学 | Technology for pretreating molten iron inshallow smelting bath by blowing Mg-base desulfurizing agent |
| CN102198383A (en) * | 2008-10-20 | 2011-09-28 | 湖北省通山县通力镁业有限责任公司 | Compound desulfurizer |
| CN103103312A (en) * | 2013-02-21 | 2013-05-15 | 攀钢集团攀枝花钢钒有限公司 | Semisteel desulfurization agent and desulfurization method using the same |
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2019
- 2019-07-03 CN CN201910595441.3A patent/CN110373515B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294200A (en) * | 1999-11-02 | 2001-05-09 | 北京科技大学 | Technology for pretreating molten iron inshallow smelting bath by blowing Mg-base desulfurizing agent |
| CN102198383A (en) * | 2008-10-20 | 2011-09-28 | 湖北省通山县通力镁业有限责任公司 | Compound desulfurizer |
| CN103103312A (en) * | 2013-02-21 | 2013-05-15 | 攀钢集团攀枝花钢钒有限公司 | Semisteel desulfurization agent and desulfurization method using the same |
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