CN109182653A - A kind of high-efficiency desulfurization method of iron casting - Google Patents
A kind of high-efficiency desulfurization method of iron casting Download PDFInfo
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- CN109182653A CN109182653A CN201811200562.5A CN201811200562A CN109182653A CN 109182653 A CN109182653 A CN 109182653A CN 201811200562 A CN201811200562 A CN 201811200562A CN 109182653 A CN109182653 A CN 109182653A
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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
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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 a kind of high-efficiency desulfurization methods of iron casting, the specific steps are as follows: 1) pig iron heating melting is formed molten iron, then pass to hot nitrogen, and spray into lime into molten iron；2) it maintains molten iron temperature to be passed through high-temperature oxygen after high-speed stirred at 1550-1650 DEG C, and sprays into desulfurizing agent into molten iron, isothermal holding 30-50min；3) after to isothermal holding, it is blown calcium carbide into molten iron, is stirred during blowing；4) after to be mixed, be passed through hot carbon monoxide, be stirred during being passed through, it is to be mixed after cast molding；5) cooling velocity for controlling casting is 5-10 DEG C/min, until being cooled to 1200 DEG C, is then cooled to room temperature using the method for natural cooling.The sulfur method of iron casting provided by the invention, easy to operate, rate of sulphur expulsion is fast, and desulfurization degree is high, reduces production cost, improves the quality of casting.
Description
Technical field
The invention belongs to iron casting technical fields, and in particular to a kind of high-efficiency desulfurization method of iron casting.
Background technique
In China's pig iron resource abundant, a small amount of element sulphur is contained in most of pig iron, wherein sulphur is generally acknowledged
Harmful element, it promotes the combination of iron and carbon, keeps iron firmly crisp, and the iron sulfide of low melting point is combined to iron, and the pig iron is made to generate heat
Brittleness and the mobility for lowering iron liquid, so that the inferior quality of the fluid origin iron pipe of the pig iron, intensity are low, it is prone to corrode, be
This, generally requires casting carrying out desulfurization process, to promote its quality.Existing desulfuration of foundry iron technology, desulfurization effect is poor, work
Skill is complicated, not only causes the waste of the energy, but also reduce economic benefit.Therefore, improve desulfuration of foundry iron efficiency be one urgently
It solves the problems, such as.
Summary of the invention
The purpose of the present invention is being directed to existing problem, a kind of high-efficiency desulfurization method of iron casting is provided.
The present invention is achieved by the following technical solutions:
A kind of high-efficiency desulfurization method of iron casting, which is characterized in that the specific method is as follows:
1) pig iron is heated to molten state, becomes molten iron, nitrogen is heated to 800-1000 DEG C in advance, then passes to hot nitrogen
Gas, as hot nitrogen sprays into lime into molten iron, the partial size of lime is 50-100nm, and lime is relative to the mass ratio of molten iron
1.5-2.0:1000；
2) it maintains molten iron temperature at 1550-1650 DEG C, then stirs 2-3h, end to be mixed in the case where revolving speed is 500-800r/min
After be passed through high-temperature oxygen, as high-temperature oxygen sprays into desulfurizing agent into molten iron, isothermal holding 30-50min, desulfurizing agent is relative to iron
The mass ratio of water is 6-10:1000；
3) after to isothermal holding, calcium carbide is blown into molten iron, the partial size of calcium carbide is 40-70nm, and calcium carbide is relative to molten iron
Mass ratio is 1.0-1.3:1000, is stirred during blowing, revolving speed 400-600r/min, mixing time 3-4h；
4) after to be mixed, carbon monoxide is previously heated to 600-700 DEG C, then passes to hot carbon monoxide, had been passed through
Be stirred in journey, revolving speed 700-900r/min, mixing time 2-4h, it is to be mixed after cast molding；
5) cooling velocity for controlling casting is 5-10 DEG C/min, until being cooled to 1200 DEG C, then uses the method for natural cooling
It is cooled to room temperature.
Preferably, a kind of high-efficiency desulfurization method of iron casting, wherein in step 1), the hot nitrogen is passed through the time and is
30-40min。
Preferably, a kind of high-efficiency desulfurization method of iron casting, wherein in step 2, the temperature of the high-temperature oxygen is
1000-1100℃。
Preferably, a kind of high-efficiency desulfurization method of iron casting, wherein in step 2, the desulfurizing agent be by iron oxide,
Carboxymethyl cellulose, flyash, water are according to shaping and drying after the mass ratio mixing of 1-1.5:2-3:4-6:20-50, then through roasting
It fires for made of, drying temperature is 60-80 DEG C, drying time 5-10h, and maturing temperature is 120-160 DEG C, calcining time 3-
5h。
The present invention has the advantage that the sulfur method of iron casting provided by the invention, operation letter compared with prior art
Single, rate of sulphur expulsion is fast, and desulfurization degree is high, reduces production cost, improves the quality of casting, firstly, by after pig iron heating melting
Lime is sprayed into molten iron by hot nitrogen, the partial size of lime is 50-100nm, and lime and molten iron interact, on lime surface
Generating calcium ferrite can promote the sulphur in molten iron in the diffusion on lime surface then using high-speed stirred；Secondly, to molten iron
In be passed through a certain amount of oxygen the part iron in molten iron can be made to aoxidize to form di-iron trioxide, and three oxidation two at high temperature
Iron can slough oxygen and form ferroso-ferric oxide, since ferroso-ferric oxide has magnetism well, can magnetize to desulfurizing agent, from
And improve desulfurization rate and desulfurization degree；Again, calcium carbide is sprayed into molten iron after end to be desulfurization, then can remove in molten iron and contain
Dissolved oxygen, be then passed through hot carbon monoxide again, then the ferroso-ferric oxide contained in molten iron and ferric oxide can be made to be reduced into
Iron；Finally, by slow cooling first after molten iron cast molding to 1200 DEG C, it can be to avoid the too fast crystal form knot to cast-internal that cools down
It is configured to destroy, and then influences the mechanical property of casting.
Specific embodiment
Below with reference to specific implementation method, the present invention is described further.
Embodiment 1
A kind of high-efficiency desulfurization method of iron casting, which is characterized in that the specific method is as follows:
1) pig iron is heated to molten state, becomes molten iron, nitrogen is heated to 800 DEG C in advance, then passes to hot nitrogen, with
Hot nitrogen sprays into lime into molten iron, and the partial size of lime is 50nm, and lime is 1.5:1000 relative to the mass ratio of molten iron；
2) it maintains molten iron temperature at 1550 DEG C, then stirs 3h in the case where revolving speed is 500r/min, be passed through high temperature after to be mixed
Oxygen, as high-temperature oxygen sprays into desulfurizing agent, isothermal holding 30min into molten iron, desulfurizing agent is relative to the mass ratio of molten iron
6:1000；
3) after to isothermal holding, calcium carbide is blown into molten iron, the partial size of calcium carbide is 40nm, quality of the calcium carbide relative to molten iron
Than being stirred during blowing, revolving speed 400r/min, mixing time 4h for 1.0:1000；
4) after to be mixed, carbon monoxide is previously heated to 600 DEG C, hot carbon monoxide is then passed to, during being passed through
Be stirred, revolving speed 700r/min, mixing time 4h, it is to be mixed after cast molding；
5) cooling velocity for controlling casting is 5 DEG C/min, until 1200 DEG C are cooled to, it is then cooling using the method for natural cooling
To room temperature.
Preferably, the hot nitrogen is passed through the time as 30min wherein in step 1).
Preferably, the temperature of the high-temperature oxygen is 1000 DEG C wherein in step 2.
Preferably, wherein in step 2, the desulfurizing agent be by iron oxide, carboxymethyl cellulose, flyash, water according to
Shaping and drying after the mass ratio mixing of 1:2:4:20, is then fired and is prepared, and drying temperature is 60 DEG C, drying time
10h, maturing temperature are 120 DEG C, calcining time 5h.
Embodiment 2
A kind of high-efficiency desulfurization method of iron casting, which is characterized in that the specific method is as follows:
1) pig iron is heated to molten state, becomes molten iron, nitrogen is heated to 900 DEG C in advance, then passes to hot nitrogen, with
Hot nitrogen sprays into lime into molten iron, and the partial size of lime is 80nm, and lime is 1.7:1000 relative to the mass ratio of molten iron；
2) it maintains molten iron temperature at 1600 DEG C, then stirs 2.5h in the case where revolving speed is 700r/min, be passed through height after to be mixed
Warm oxygen, as high-temperature oxygen sprays into desulfurizing agent, isothermal holding 40min, mass ratio of the desulfurizing agent relative to molten iron into molten iron
For 8:1000；
3) after to isothermal holding, calcium carbide is blown into molten iron, the partial size of calcium carbide is 50nm, quality of the calcium carbide relative to molten iron
Than being stirred during blowing, revolving speed 500r/min, mixing time 3.5h for 1.2:1000；
4) after to be mixed, carbon monoxide is previously heated to 650 DEG C, hot carbon monoxide is then passed to, during being passed through
Be stirred, revolving speed 800r/min, mixing time 2.5h, it is to be mixed after cast molding；
5) cooling velocity for controlling casting is 7 DEG C/min, until 1200 DEG C are cooled to, it is then cooling using the method for natural cooling
To room temperature.
Preferably, the hot nitrogen is passed through the time as 35min wherein in step 1).
Preferably, the temperature of the high-temperature oxygen is 1050 DEG C wherein in step 2.
Preferably, wherein in step 2, the desulfurizing agent be by iron oxide, carboxymethyl cellulose, flyash, water according to
Shaping and drying after the mass ratio mixing of 1.2:2.5:5:30, is then fired and is prepared, and drying temperature is 70 DEG C, when dry
Between 7h, maturing temperature be 140 DEG C, calcining time 4h.
Embodiment 3
A kind of high-efficiency desulfurization method of iron casting, which is characterized in that the specific method is as follows:
1) pig iron is heated to molten state, becomes molten iron, nitrogen is heated to 1000 DEG C in advance, then passes to hot nitrogen, with
Hot nitrogen spray into lime into molten iron, the partial size of lime is 100nm, and lime is 2.0:1000 relative to the mass ratio of molten iron；
2) it maintains molten iron temperature at 1650 DEG C, then stirs 2h in the case where revolving speed is 800r/min, be passed through high temperature after to be mixed
Oxygen, as high-temperature oxygen sprays into desulfurizing agent, isothermal holding 50min into molten iron, desulfurizing agent is relative to the mass ratio of molten iron
10:1000；
3) after to isothermal holding, calcium carbide is blown into molten iron, the partial size of calcium carbide is 70nm, quality of the calcium carbide relative to molten iron
Than being stirred during blowing, revolving speed 600r/min, mixing time 3h for 1.3:1000；
4) after to be mixed, carbon monoxide is previously heated to 700 DEG C, hot carbon monoxide is then passed to, during being passed through
Be stirred, revolving speed 900r/min, mixing time 2h, it is to be mixed after cast molding；
5) cooling velocity for controlling casting is 10 DEG C/min, until 1200 DEG C are cooled to, it is then cold using the method for natural cooling
But to room temperature.
Preferably, the hot nitrogen is passed through the time as 40min wherein in step 1).
Preferably, the temperature of the high-temperature oxygen is 1100 DEG C wherein in step 2.
Preferably, wherein in step 2, the desulfurizing agent be by iron oxide, carboxymethyl cellulose, flyash, water according to
Shaping and drying after the mass ratio mixing of 1.5:3:6:50, is then fired and is prepared, and drying temperature is 80 DEG C, drying time
5h, maturing temperature are 160 DEG C, calcining time 3h.
Comparative example 1: it is passed through hot nitrogen in removal step 1), remaining is same as Example 1.
Comparative example 2: it is passed through high-temperature oxygen in removal step 2, remaining is same as Example 1.
Comparative example 3: calcium carbide is blown into molten iron in removal step 3), remaining is same as Example 1.
Comparative example 4: the carbon monoxide in removal step 4) heats in advance, remaining is same as Example 1.
Test example: the 1000kg life for the use of the method that embodiment 1-3 and comparative example 1-4 is provided being respectively 0.1% to sulfur content
Iron carries out desulfurization, and control group selects existing desulfurization technology to carry out desulfurization to the pig iron, counts the desulfurization degree of the pig iron, record result is such as
Shown in table one:
Table one
As can be seen from Table I: the desulfurization degree highest of the pig iron in embodiment 1-3, desulfurization effect are substantially better than comparative example 1-4 and right
According to group, it can be seen that, the sulfur method of iron casting provided by the invention, easy to operate, rate of sulphur expulsion is fast, and desulfurization degree is high, drop
Low production cost, improves the quality of casting.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
It transforms or replaces, should be covered by the scope of protection of the present invention without what creative work was expected.
Claims (4)
1. a kind of high-efficiency desulfurization method of iron casting, which is characterized in that the specific method is as follows:
1) pig iron is heated to molten state, becomes molten iron, nitrogen is heated to 800-1000 DEG C in advance, then passes to hot nitrogen
Gas, as hot nitrogen sprays into lime into molten iron, the partial size of lime is 50-100nm, and lime is relative to the mass ratio of molten iron
1.5-2.0:1000；
2) it maintains molten iron temperature at 1550-1650 DEG C, then stirs 2-3h, end to be mixed in the case where revolving speed is 500-800r/min
After be passed through high-temperature oxygen, as high-temperature oxygen sprays into desulfurizing agent into molten iron, isothermal holding 30-50min, desulfurizing agent is relative to iron
The mass ratio of water is 6-10:1000；
3) after to isothermal holding, calcium carbide is blown into molten iron, the partial size of calcium carbide is 40-70nm, and calcium carbide is relative to molten iron
Mass ratio is 1.0-1.3:1000, is stirred during blowing, revolving speed 400-600r/min, mixing time 3-4h；
4) after to be mixed, carbon monoxide is previously heated to 600-700 DEG C, then passes to hot carbon monoxide, had been passed through
Be stirred in journey, revolving speed 700-900r/min, mixing time 2-4h, it is to be mixed after cast molding；
5) cooling velocity for controlling casting is 5-10 DEG C/min, until being cooled to 1200 DEG C, then uses the method for natural cooling
It is cooled to room temperature.
2. a kind of high-efficiency desulfurization method of iron casting as described in claim 1, which is characterized in that in step 1), the hot nitrogen
Gas is passed through the time as 30-40min.
3. a kind of high-efficiency desulfurization method of iron casting as described in claim 1, which is characterized in that in step 2, the high temperature
The temperature of oxygen is 1000-1100 DEG C.
4. a kind of high-efficiency desulfurization method of iron casting as described in claim 1, which is characterized in that in step 2, the desulfurization
Agent is formed after being mixed by iron oxide, carboxymethyl cellulose, flyash, water according to the mass ratio of 1-1.5:2-3:4-6:20-50
It is dry, it is then fired and is prepared, drying temperature is 60-80 DEG C, drying time 5-10h, maturing temperature 120-160
DEG C, calcining time 3-5h.
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| CN201811200562.5A CN109182653A (en) | 2018-10-16 | 2018-10-16 | A kind of high-efficiency desulfurization method of iron casting |
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| CN201811200562.5A CN109182653A (en) | 2018-10-16 | 2018-10-16 | A kind of high-efficiency desulfurization method of iron casting |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664128A (en) * | 2005-04-14 | 2005-09-07 | 钢铁研究总院 | Process for composite desulfurization of molten iron |
| CN103890199A (en) * | 2011-10-17 | 2014-06-25 | 杰富意钢铁株式会社 | Powder injection lance and method of refining molten iron using the powder injection lance |
| CN105664706A (en) * | 2016-01-19 | 2016-06-15 | 北京三聚环保新材料股份有限公司 | High-sulfur-capacity low-cost desulfurizing agent and preparation method thereof |
| CN106011374A (en) * | 2016-06-29 | 2016-10-12 | 农杰 | Method for improving wear resistance of pig iron casting |
-
2018
- 2018-10-16 CN CN201811200562.5A patent/CN109182653A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664128A (en) * | 2005-04-14 | 2005-09-07 | 钢铁研究总院 | Process for composite desulfurization of molten iron |
| CN103890199A (en) * | 2011-10-17 | 2014-06-25 | 杰富意钢铁株式会社 | Powder injection lance and method of refining molten iron using the powder injection lance |
| CN105664706A (en) * | 2016-01-19 | 2016-06-15 | 北京三聚环保新材料股份有限公司 | High-sulfur-capacity low-cost desulfurizing agent and preparation method thereof |
| CN106011374A (en) * | 2016-06-29 | 2016-10-12 | 农杰 | Method for improving wear resistance of pig iron casting |
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