CN1069073A - Method with direct smelting gray iron with scrap white iron - Google Patents
Method with direct smelting gray iron with scrap white iron Download PDFInfo
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- CN1069073A CN1069073A CN 91106762 CN91106762A CN1069073A CN 1069073 A CN1069073 A CN 1069073A CN 91106762 CN91106762 CN 91106762 CN 91106762 A CN91106762 A CN 91106762A CN 1069073 A CN1069073 A CN 1069073A
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- pig iron
- white pig
- iron
- graphite
- white
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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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Abstract
But the present invention relates to the method that the useless assorted white pig iron of a kind of usefulness smelts the graphitic pig iron of straight forming foundry goods, its major technique feature is in smelting process, adopting useless assorted white pig iron is starting material, add graphite and can promote elements such as greying, crystal grain thinning, desulfurization, thereby obtain to be directly used in the high-quality graphitic pig iron of foundry goods.
Description
The present invention relates to a kind of method, belong to C21C1/08, C21D5/16 with direct smelting gray iron with scrap white iron and foundry goods thereof.
White pig iron is because impurity height such as sulfur-bearings, phosphorus, and is siliceous, manganese element is low, and contained carbon is with Fe
3C is dissolved in the form existence that the γ phase region forms ledeburite, thereby white pig iron fragility is big, is difficult to the mechanical workout worker, generally is only limited to steel-making, and its use face is restricted.As white pig iron being transformed into the graphitic pig iron of easy mechanical workout or directly smelting into the gray castings of good mechanical property, just be necessary to reduce the content of detrimental impurity such as sulphur, phosphorus in the white pig iron, and make Fe
3C is dissolved in alpha phase zone from the γ phase region, will have graphite to separate out or graphite participation reaction simultaneously, to form Fe-C graphite and Fe
3The mechanical mixture of C.Graphite is a kind of material of fire-resistant oxidation resistant, works as Fe
3When C was oxidized to liquid phase in stove, graphite was absorbed rapidly by molten metal and forms Fe-C graphite.Silicon is the graphited element of a kind of promotion, and it can quicken the process that molten metal absorbs graphite, and the effect of crystal grain thinning is arranged.Copper can play the effect of crystal grain thinning by " smashing " carbide, and copper also can suppress the expansion of carbide volume simultaneously, eliminates internal stress, improves the mechanical property of foundry goods.Manganese is because strong with the binding ability of sulphur, generate dystectic compound MnS or rich manganese sulfide (Mn, Fe) S, thereby offset the deleterious effect of sulphur.Calcium combines with sulphur and forms CaS, can further reduce the deleterious effect of sulphur.Aluminium is emitted high heat when the stove internal combustion, and forms the slag of high basicity with lime mud, and molten iron enters in the basic slag when dripping the formula fusing, and impurity such as sulphur, phosphorus are removed.
The purpose of this invention is to provide the method that the useless assorted white pig iron of a kind of usefulness is directly smelted into graphitic pig iron and foundry goods thereof.
Method of the present invention is to utilize the high characteristics of the carbon content of white pig iron own, adds graphite again and promotes greying through oxidation and decarbonization, and elements such as crystal grain thinning, desulfurization, thus acquisition is directly used in the high-quality grey cast iron of foundry goods.The used starting material of the present invention mainly are useless assorted white pig iron, but also can be other white pig iron; The graphite pebbles of graphite for making with Graphite Powder 99, ferrosilicon powder, copper car bits, aluminium car bits, water glass etc.; Manganese adopts high carbon ferromanganese; Silicon is 75
#Ferrosilicon; Calcium employing Wingdale (CaO)) ratio of components of white pig iron, Wingdale, ferromanganese, ferrosilicon, graphite pebbles, broken electrode block, coke is: 100～150: 10～20: 0.3～0.5: 0.5～1.5: 1～5: 0～10: 0～4.Technical process of the present invention comprises graphite pebbles preparation, batching, cupola melting, moulding etc.Preparation is during graphite pebbles, be with Graphite Powder 99, ferrosilicon powder, copper car bits, aluminium car bits, water glass in 80～90: after 5～10: 2～3: 2～5: 8～10 ratio cooperates, stir make spherical or block, dry for standby.After graphite pebbles prepares, take by weighing supplementary materials such as white pig iron according to quantity, drop into by different level in the cupola furnace, in 1420～1470 ℃ of scopes, smelt moulding.
Below in conjunction with embodiment the present invention further is illustrated:
1. graphite pebbles preparation: take by weighing Graphite Powder 99 85kg, ferrosilicon powder 8kg, copper car bits 2.5kg, aluminium car bits 3kg mixes with 9kg water glass after mixing again, make spherical, dry for standby.
2. prepare burden and cupola melting: after getting material ready by aforementioned ratio of components, drop into by different level in the cupola furnace in batches, carry out melting in 1420～1470 ℃.
3. moulding: processing method molten iron casting that cupola melting is got is a water pump impeller routinely.
The overlap of water pump impeller is opened, and fracture does not have the white pig iron tendency, and the disconnected graphite of its dead head is present in the matrix the whole perlite that is organized as with sheet strip graphite form.The clear wash rice of foundry goods corner angle, casting flaws such as pore-free, shrinkage cavity, crackle.
Claims (2)
- But 1, the useless assorted white pig iron of a kind of usefulness method of smelting the graphitic pig iron of straight forming foundry goods, its technical process comprises that graphite pebbles preparation, batching, cupola furnace are smelted, moulding, the invention is characterized in: with Graphite Powder 99, ferrosilicon powder, copper car bits, aluminium car bits, water glass in 80～90: after 5～10: 2～3: 2～5: 8～10 the ratio cooperation, mix and make spherical or blocky graphite pebbles, oven dry; Press white pig iron 100～150 then: Wingdale 10～20: high carbon ferromanganese 0.3～0.5: 75 #Ferrosilicon 0.5～1.5: graphite pebbles 1～5: broken electrode block 0～10: the ratio of coke 0～4 is prepared burden, and drops in the cupola furnace by level in batches and smelts.
- 2, inventive method according to claim 1 is characterized in that used white pig iron can be useless assorted white pig iron, also can be the white pig iron beyond the useless assorted white pig iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106762 CN1069073A (en) | 1991-07-26 | 1991-07-26 | Method with direct smelting gray iron with scrap white iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106762 CN1069073A (en) | 1991-07-26 | 1991-07-26 | Method with direct smelting gray iron with scrap white iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1069073A true CN1069073A (en) | 1993-02-17 |
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ID=4908142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91106762 Pending CN1069073A (en) | 1991-07-26 | 1991-07-26 | Method with direct smelting gray iron with scrap white iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1069073A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141026A (en) * | 2005-12-08 | 2014-11-12 | 株式会社神户制钢所 | Continuous refining method and continuous refining equipment |
| CN104141026B (en) * | 2005-12-08 | 2017-01-04 | 株式会社神户制钢所 | Continuous refining method and continuous refining equipment |
-
1991
- 1991-07-26 CN CN 91106762 patent/CN1069073A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141026A (en) * | 2005-12-08 | 2014-11-12 | 株式会社神户制钢所 | Continuous refining method and continuous refining equipment |
| CN104141026B (en) * | 2005-12-08 | 2017-01-04 | 株式会社神户制钢所 | Continuous refining method and continuous refining equipment |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |