CN108504805A - A method of control blast furnace short route casts graphite floatation - Google Patents
A method of control blast furnace short route casts graphite floatation Download PDFInfo
- Publication number
- CN108504805A CN108504805A CN201810460856.5A CN201810460856A CN108504805A CN 108504805 A CN108504805 A CN 108504805A CN 201810460856 A CN201810460856 A CN 201810460856A CN 108504805 A CN108504805 A CN 108504805A
- Authority
- CN
- China
- Prior art keywords
- molten iron
- graphite
- carbon
- content
- blast furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
- C21B5/023—Injection of the additives into the melting part
-
- 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
- C21C1/08—Manufacture of cast-iron
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (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 methods that control blast furnace short route casts graphite floatation, and this method comprises the following steps：Step 1：It is blast-melted it is middle be added a certain amount of steel scrap increase it is blast-melted in oxygen content；Step 2：1,500 1550 DEG C are reached to blast-melted progress heating temperature, keeps hot metal composition uniform；Step 3：Carbon content in control molten iron is 3.0% 3.5%, carbon equivalent is 4.0% 4.3%；Step 4：Molten iron taps a blast furnace into pouring ladle, and to skimming at packet mouth, Slag conglomeration agent is spread after skimming totally；Step 5：Random inoculant is added into molten iron；Step 6：Cast.Steel scrap is added in molten iron of the present invention and increases oxygen content, improve the burn out rate of graphite, reduce the content of graphite in molten iron, to avoid graphite aggregation and graphite floatation phenomenon, high-duty iron part is produced, is not only realized using the blast-melted high-end casting of casting, reduce casting smelting cost, labor intensity and environmental pollution are reduced, steel scrap can also be largely used, avoid secondary pollution and energy waste.
Description
Technical field
The invention belongs to metallurgical casting technical fields, and in particular to a kind of side of control blast furnace short route casting graphite floatation
Method.
Background technology
Currently, Foundry Works is a complete independent system, after Large Steel ironworks melt iron, face is cast by casting machine
Iron clad (ingot iron), then by long short-distance transport to Foundry Works, while Foundry Works will also purchase coke, scrap iron and steel, waste residue and molten
Then these substances are smelted into molten iron again using furnace cupola or intermediate frequency furnace, then are cast as after being cast to mold by the substances such as agent
Casting.This conventional cast factory needs to buy largely and stores the substance of melt iron, but also it is molten to have molten iron
The big mini-plants such as refining tool such as furnace cupola or intermediate frequency furnace, these not only need to put into a large amount of fund, manpower and time,
And a prodigious workshop or place is needed, and melt iron is secondary operation, greatly consume social resources, pollution ring
Border.
" short route " technique is one of the optimisation technique that casting association of country emphasis is promoted, so-called " short route " founder
Skill, exactly with it is blast-melted be directly entered intermediate frequency furnace carry out heating and adjusting component, the pouring cast part after Metamorphism treatment save use
Remelting efficiently uses blast-melted heat to pig iron at the process of molten iron again；Short route casting project is a kind of energy saving, height
Effect, low cost, the method for casting production of of low pollution are not only able to be greatly lowered the consumption of coke or electric energy and pollutant
Discharge capacity has good environmental protection benefit, while can bring the huge energy, economy and environmental benefit.
But since short-flow melting is to be used for Foundry Production directly as furnace charge by blast-melted, graphite is easily assembled, very
It is susceptible to graphite floatation, especially at the big position of the thickness of casting and upper surface, graphite floatation causes solidified structure uneven,
Casting mechanical performance is low, and this phenomenon is more prominent when especially carbon content is high, therefore leads to blast-melted be directly used in
The abbreviated system technology of casting can be only applied to the cast product of not quality requirement, cannot be answered in high-end castings production
With.
Invention content
For deficiency existing for abbreviated system technology in the prior art, the purpose of the present invention is to provide a kind of control height
The method that stove short route casts graphite floatation, this method increase oxygen content, increase stone in molten iron by the way that steel scrap is added in molten iron
Black burn out rate solves in the prior art since graphite aggregation or graphite floatation cause casting mechanical performance low, abbreviated system
Technology can not be applied to the problem of high-end castings production.
To achieve the above object, the technical scheme is that：A kind of side of control blast furnace short route casting graphite floatation
Method, this method comprises the following steps：Step 1：It is blast-melted it is middle be added a certain amount of steel scrap increase it is blast-melted in oxygen contain
Amount；Step 2：1500-1550 DEG C is reached to blast-melted progress heating temperature, keeps hot metal composition uniform；Step 3：Control molten iron
In carbon content be 3.0%-3.5%, carbon equivalent 4.0%-4.3%；Step 4：Molten iron taps a blast furnace into pouring ladle, at packet mouth
It skims, Slag conglomeration agent is spread after skimming totally；Step 5：Random inoculant is added into molten iron；Step 6：Cast.
Further, the computational methods of the carbon equivalent are：The one third of silicone content is plus the carbon in molten iron in molten iron
Content.
Further, the addition of the inovulant is 0.1%-0.2%, and the inovulant is that silicon barium calcium is compound inoculated
Agent.
Further, the concrete operations of the step 3 are：A. the temperature for measuring molten iron, when temperature reaches 1400-1450
DEG C when, sample spoon is extend into molten iron center liquid level, be deep within the scope of liquid level or less 10-200mm sample；B. the sample liquid to being taken
Polishing is composed, and carbon content and silicone content in molten iron are detected；C. worked as according to the carbon content and silicone content, the carbon for calculating molten iron discharging that detect
Amount；D. judge whether carbon content in molten iron and carbon equivalent are qualified, if unqualified, continue that steel scrap is added into molten iron, repeat to walk
Rapid a, b, c are until carbon content and carbon equivalent qualification in molten iron.
Further, the operation principle of the step 1 is：Oxygen is reacted with graphite under hot conditions, and graphite is burnt.
Further, the ingredient for the Slag conglomeration agent added in the step 4 includes pearl salt.
The advantages of using technical solution of the present invention for：
1. the present invention it is blast-melted it is middle a certain amount of steel scrap is added, can increase it is blast-melted in oxygen content, in height
Under the conditions of temperature, oxygen content are sufficient, oxygen is fully reacted with graphite generates carbon dioxide and water, increases the burning of graphite in molten iron
Loss rate reduces the content of graphite in molten iron, to avoid graphite aggregation and graphite floatation phenomenon, improves the quality of casting.
2. the present invention increases blast-melted oxygen content by the way that steel scrap is added into molten iron, to increase the shape of cast iron graphite nuclei
At, and the more tiny rounding of Graphite Morphology in Cast Iron under low-carbon amount and low-carbon-equivalent.
3. steel scrap is added in the abbreviated system of the present invention in molten iron, the content of carbon content and carbon equivalent, Ke Yixian are controlled
Writing improves since graphite aggregation and graphite floatation lead to that casting mechanical performance is low, ropy phenomenon, and final production goes out complete symbol
Close the high-duty iron part that performance requires, not only realize using the high-end casting of blast-melted casting, reduce casting smelting at
This, reduces labor intensity and the environmental pollution of foundry enterprise melting work, can also largely use steel scrap, turn waste into wealth, avoided
Secondary pollution and energy waste.
Specific implementation mode
A method of control blast furnace short route casts graphite floatation, includes the following steps：
Step 1：It is blast-melted it is middle be added a certain amount of steel scrap increase it is blast-melted in oxygen content, graphite it is main at
Timesharing carbon, under the conditions of high temperature, oxygen content are sufficient, oxygen is fully reacted with carbon generates carbon dioxide and water, increases molten iron
The burn out rate of middle graphite reduces the content of graphite in molten iron, to avoid graphite aggregation and graphite floatation phenomenon, improves casting
Quality.
Step 2：1500-1550 DEG C is reached to blast-melted progress heating temperature, molten iron is heated at high temperature, on the one hand
The steel scrap being added in step 1 can be made fully to melt to be integrated with molten iron dissolving, so that hot metal composition is homogenized, another aspect high temperature item
Graphite can be made fully to burn under part, reduce the residual of graphite.
Step 3：Control molten iron in carbon content be 3.0%-3.5%, carbon equivalent 4.0%-4.3%, wherein carbon equivalent
Computational methods be：The one third of silicone content is plus the carbon content in molten iron in molten iron.
The specific detection method of carbon content and carbon equivalent is in molten iron in step 3：
Sample spoon is extend into molten iron center liquid level by the temperature for a. measuring molten iron when temperature reaches 1400-1450 DEG C, deep
Enter into 10-200mm below liquid level and sample, in the preferred embodiment of the present invention, when sampling is deep into liquid level or less 50-
It is sampled within the scope of 100mm；
B. the sample liquid polishing taken is composed, detects carbon content and silicone content in molten iron；
C. according to the carbon content and silicone content detected, the carbon equivalent of molten iron discharging is calculated, carbon equivalent is equal to silicon in molten iron and contains
The one third of amount adds the carbon content in molten iron；
D. judge whether carbon content in molten iron and carbon equivalent are qualified, if unqualified, continue that steel scrap is added into molten iron, weight
Multiple step a, b, c are until carbon content and carbon equivalent qualification in molten iron, after carbon content and carbon equivalent reach requirement in molten iron
Carry out step 4.
Step 4：Molten iron taps a blast furnace into pouring ladle, and to skimming at packet mouth, Slag conglomeration agent is spread after skimming totally；In the present invention
Preferred embodiment in, the main component of the Slag conglomeration agent is pearl salt.
Step 5：Random inoculant is added into molten iron；In the preferred embodiment of the present invention, the addition of the random inoculant
Amount is 0.1%-0.2%, that is, the random inoculant being added accounts for the 0.1%-0.2% of molten iron, general when the part of casting is smallclothes
By the addition control of inovulant 0.1%, generally the addition of inovulant is controlled when the part of casting is big part
0.2%.Preferably, the inovulant being added in molten iron is silicon barium calcium composite inoculant, and wherein silicone content control is 70% or so, barium
Content controls between 4%-5%, and calcium content controls between 2%-3%, remaining is the other objects added according to practical application
Matter, such as carbon, phosphorus, sulphur, aluminium etc..
Step 6：Cast, pours into a mould and opens within first 10 minutes cast vacuum, and control pouring pressure is -0.05~0.07Mpa；Cast
It crosses range request speed and follows slow, fast, slow sequence, terminate to cast to terminate from reaction is bred, time control was at 10-15 minutes；
Choose Slag conglomeration agent after casting complete, otherwise under the influence of a packet casting quality.
The present invention increases blast-melted oxygen content by the way that steel scrap is added into molten iron, to increase the shape of cast iron graphite nuclei
At, and the more tiny rounding of Graphite Morphology in Cast Iron under low-carbon amount and low-carbon-equivalent.
It is stringent to control carbon content and carbon equivalent in molten iron the study found that adjust to the blast-melted ratio that steel scrap is added
Content, heating temperature, the type of inovulant and additive amount, pouring temperature and the duration of pouring etc..Abbreviated system adds in molten iron
Enter steel scrap, control the content of carbon content and carbon equivalent, can significantly improve since graphite aggregation and graphite floatation lead to casting machine
Tool performance is low, ropy phenomenon, and final production goes out to comply fully with the high-duty iron part of performance requirement, and not only realizing makes
With the blast-melted high-end casting of casting, casting smelting cost is reduced, the labor intensity and environment of foundry enterprise melting work are reduced
Pollution, can also largely use steel scrap, turn waste into wealth, avoid secondary pollution and energy waste.
The present invention is exemplarily described in above example, it is clear that the present invention implements not by aforesaid way
Limitation, as long as using the improvement of the various unsubstantialities of technical solution of the present invention progress, or the not improved structure by the present invention
Think and technical solution directly applies to other occasions, within protection scope of the present invention.
Claims (6)
1. a kind of method of control blast furnace short route casting graphite floatation, it is characterised in that：This method comprises the following steps：Step
1：It is blast-melted it is middle be added a certain amount of steel scrap increase it is blast-melted in oxygen content；Step 2：It is heated to blast-melted
Temperature reaches 1500-1550 DEG C, keeps hot metal composition uniform；Step 3：Carbon content in control molten iron is 3.0%-3.5%, carbon is worked as
Amount is 4.0%-4.3%；Step 4：Molten iron taps a blast furnace into pouring ladle, and to skimming at packet mouth, Slag conglomeration agent is spread after skimming totally；
Step 5：Random inoculant is added into molten iron；Step 6：Cast.
2. a kind of method of control blast furnace short route casting graphite floatation as described in claim 1, it is characterised in that：The carbon
The computational methods of equivalent are：The one third of silicone content is plus the carbon content in molten iron in molten iron.
3. a kind of method of control blast furnace short route casting graphite floatation as described in claim 1, it is characterised in that：It is described pregnant
The addition for educating agent is 0.1%-0.2%, and the inovulant is silicon barium calcium composite inoculant.
4. a kind of method of control blast furnace short route casting graphite floatation as described in claims 1 to 3 any one, feature
It is：The concrete operations of the step 3 are：A. the temperature for measuring molten iron stretches sample spoon when temperature reaches 1400-1450 DEG C
Enter to molten iron center liquid level, is deep within the scope of liquid level or less 10-200mm and samples；B. the sample liquid polishing taken is composed, detects iron
Carbon content and silicone content in water；C. according to the carbon content and silicone content detected, the carbon equivalent of molten iron discharging is calculated；D. judge molten iron
In carbon content and carbon equivalent it is whether qualified, if unqualified, continue that steel scrap is added into molten iron, repeat step a, b, c until iron
Until carbon content and carbon equivalent qualification in water.
5. a kind of method of control blast furnace short route casting graphite floatation as claimed in claim 4, it is characterised in that：The step
Rapid 1 operation principle is：Oxygen is reacted with graphite under hot conditions, and graphite is burnt.
6. a kind of method of control blast furnace short route casting graphite floatation as claimed in claim 4, it is characterised in that：The step
The ingredient for the Slag conglomeration agent added in rapid 4 includes pearl salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810460856.5A CN108504805A (en) | 2018-05-15 | 2018-05-15 | A method of control blast furnace short route casts graphite floatation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810460856.5A CN108504805A (en) | 2018-05-15 | 2018-05-15 | A method of control blast furnace short route casts graphite floatation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108504805A true CN108504805A (en) | 2018-09-07 |
Family
ID=63400719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810460856.5A Pending CN108504805A (en) | 2018-05-15 | 2018-05-15 | A method of control blast furnace short route casts graphite floatation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108504805A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348846A (en) * | 2008-09-10 | 2009-01-21 | 林州市合鑫铸业有限公司 | Blast furnace-intermediate frequency furnace duplexing smelting short process production technology |
| CN101768691A (en) * | 2009-12-29 | 2010-07-07 | 青州豪章铸造有限公司 | Productive technology of short flow of structure type cast iron part |
| CN102586666A (en) * | 2012-03-09 | 2012-07-18 | 青州豪章铸造有限公司 | Special cleansing agent for short-flow high-strength cast iron and manufacturing process thereof |
| CN107119168A (en) * | 2017-06-13 | 2017-09-01 | 磐石华兴汽车零部件制造有限公司 | A kind of method that blast-melted short route casts high-quality casting |
-
2018
- 2018-05-15 CN CN201810460856.5A patent/CN108504805A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348846A (en) * | 2008-09-10 | 2009-01-21 | 林州市合鑫铸业有限公司 | Blast furnace-intermediate frequency furnace duplexing smelting short process production technology |
| CN101768691A (en) * | 2009-12-29 | 2010-07-07 | 青州豪章铸造有限公司 | Productive technology of short flow of structure type cast iron part |
| CN102586666A (en) * | 2012-03-09 | 2012-07-18 | 青州豪章铸造有限公司 | Special cleansing agent for short-flow high-strength cast iron and manufacturing process thereof |
| CN107119168A (en) * | 2017-06-13 | 2017-09-01 | 磐石华兴汽车零部件制造有限公司 | A kind of method that blast-melted short route casts high-quality casting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106811676A (en) | A kind of high-intensity high-tenacity as cast condition QT700 10 and its production method | |
| CN105154623A (en) | Efficient alloying method for smelting 38CrMoAl steel | |
| CN105200305B (en) | A kind of casting pig and preparation method thereof | |
| CN103540701A (en) | Smelting process suitable for ultra-high strength gray cast iron | |
| CN101220413A (en) | Technique for smelting ferroferrite with sponge iron | |
| CN101525677A (en) | Production method of high-strength grey cast iron for automobile fittings | |
| CN114540568B (en) | Smelting method for improving scrap steel ratio | |
| CN110396637B (en) | Process for producing SPHC with low cost, short flow and high efficiency | |
| CN106435334A (en) | Smelting technique of as-cast ductile iron | |
| CN110551936A (en) | manganese series low alloy complex phase bainite ball milling cast iron grinding ball and preparation method thereof | |
| CN105821177A (en) | Full-tri-de technological method for converter and method for reducing total slag amount | |
| CN105568178A (en) | New manufacturing process of hot-rolled bar for carburized and quenched gear shaft of automobile transmission | |
| CN108504805A (en) | A method of control blast furnace short route casts graphite floatation | |
| CN105132626A (en) | Casting residual steel slag recycling method | |
| CN103667591A (en) | End point carbon control method for electric steelmaking with high ion content | |
| CN104561621A (en) | Melting and casting process for magnesium-aluminum alloy | |
| CN211079224U (en) | Movable preheats device of steel scrap | |
| CN114480773A (en) | Production control method for reducing production cycle of converter and improving production efficiency of converter | |
| CN104046748B (en) | A kind of liquid steel dephosphorization agent and the method for liquid steel dephosphorization | |
| JPH01316409A (en) | Method for dephosphorizing molten iron accompanied with scrap melting | |
| CN106544463A (en) | A kind of method for maintaining converter | |
| CN105177213A (en) | Pretreatment method of hot charged molten iron for casting | |
| CN114854927B (en) | Method for opening large converter | |
| CN110016606B (en) | Electric furnace smelting method for high-strength iron castings | |
| CN115141905B (en) | Smelting method of high-scrap-ratio low-oxygen-level low-phosphorus IF steel converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180907 |