CN1008940B - Be specially adapted to the furnace bottom of direct current electric arc furnace - Google Patents
Be specially adapted to the furnace bottom of direct current electric arc furnaceInfo
- Publication number
- CN1008940B CN1008940B CN 85101332 CN85101332A CN1008940B CN 1008940 B CN1008940 B CN 1008940B CN 85101332 CN85101332 CN 85101332 CN 85101332 A CN85101332 A CN 85101332A CN 1008940 B CN1008940 B CN 1008940B
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- CN
- China
- Prior art keywords
- furnace bottom
- furnace
- magnesium oxide
- graphite
- nearly
- 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.)
- Expired
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- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
For rod iron being arranged on the furnace bottom of furnace bottom as the direct current electric arc furnace of anode, for improving its useful life, in rod iron (9) zone, furnace bottom has at least one to contain the nearly fire bed in magnesian top (12) of chromium oxide and the bottom graphite linings (14) and the intervenient mixed layer of being made up of above-mentioned two kinds of materials (13) of a sheet combination.
Description
The present invention relates to the furnace bottom of a kind of furnace bottom, particularly direct current electric arc furnace, it has the center graphite electrode and the some metal bar or the rod irons that distribute circlewise that embed furnace bottom that go deep into burner hearth, and its outer end is fixed by the base steel plate of a metal furnace shell.
This type of furnace that comes into operation recently, the outer cover of steel plate of furnace bottom have a center steel plate that is embedded with rod iron, and it penetrates the refractory material of furnace bottom up to nearly fire bed.Rod iron is as anode, and at the center, the common graphite electrode that is provided with from the top is made negative electrode.We can say to a certain extent,, can not make the useful life of for example traditional furnace bottom the people satisfied because electric arc leads to furnace bottom.
Task of the present invention provides a kind of direct current electric arc furnace furnace bottom that has gratifying useful life in actual applications.
The present invention be solve like this offer the challenge: in rod iron or steel plate zone, furnace bottom have at least a nearly fire bed of forming by the magnesium oxide that contains chromium oxide in top and a sheet combination the bottom graphite linings and between the two by above-mentioned two kinds of mixed layers that material is formed.
The characteristics of this furnace bottom are to have good heat conduction and electric conductivity along each parallel layers.The erosion of liquid towards metal, magnesium oxide layer has general fire-resistant function and can fully satisfy the requirement of molten steel heat load, and the bigger middle bed of material of the heat load of graphitiferous can play the effect of thermal compensation, electric current is evenly distributed on the rod iron that embeds furnace bottom, and evenly electric charge is because the bottom graphite linings of the direct contact of steel plate of formation anode substrate causes after all.The configuration of each layer is a furnace bottom, do as a whole, its satisfactory mechanical property, and the life-span is also long especially.
Concrete regulation of the present invention is as follows: the magnesium oxide layer of nearly fiery side accounts for 90% magnesium oxide at least and contains 1.5%(weight at least by containing weight) the magnesium hydroxide filler of green fine particle chromium trioxide form, the graphite linings of sheet combination accounts for the graphite packing of (weight) 95% and forms by containing at least.Simultaneously, the graphite packing of the middle bed of material can be between 20%～80%, but is preferably 40%.In view of its physical property, the magnesium hydroxide filler that the present invention recommended can adapt to the working condition of the nearly fiery side of stove.The graphite packing of being recommended, owing to have good heat conduction and electric conductivity, and be easy to just can realize the mixing match of mixed fillers, can adapt to the working condition of the nearly fiery side of stove too.And when the tamping filler, no matter be magnesium hydroxide filler, or graphite packing can both be accomplished the not aliquation of combining closely.
At the bottom construction design aspect, the present invention's suggestion: the magnesium oxide layer of nearly fiery side should be 1/2nd of furnace bottom thickness at least.Draw the suitable size of furnace bottom packing layer thus.According to static principle, the bed of material is preferably disposed on up to central metal plate all within the refractory lining of the furnace bottom of stepped indentation.
Below by accompanying drawing example explanation the present invention.
1 expression direct current electric arc furnace among the figure, it has steel plate stove outer covering 2 and refractory lining 3, in siege 4, furnace lining 3 is made the slope 5 of peripheral stepped indentation, the edge is to the periphery that is arranged on thin plate furnace bottom 6 light plates 7 always, on steel plate 7, fix ring-shaped distributedly, reach the vertical rod iron 9 of nearly fiery wing furnace basal surface 8 tops always.These rod irons become the anode of electrode assembly, and are relative with it, and the graphite electrode 10 that passes bell is negative electrodes.
The furnace bottom 11 that has embedded rod iron 9 is by top magnesium oxide layer 12, and the bed of material 13 and graphite linings 14 were formed in the middle of magnesium oxide and graphite were composite.And the bed of material 12,13,14 all is to be made by the refractory material of not moulding.Simultaneously, in the scope on slope 5 around the siege 4, insert graphite linings 14 earlier, tamping makes strip graphite along continuous straight runs arrange again, improves the electric conductivity of the bed of material 14 if decide like this.Then, make under material and the interface good combination situation noting, to smash, and the intermediate layer 13 with magnesium oxide layer 12 and graphite linings 14 characteristics just helps this good interface combination into intermediate layer 13 and magnesium oxide layer 14.Make in this way, between the bed of material 12,13,14 in conjunction with good especially, can aliquation, more favourable for the 11 overall operation situations of the furnace bottom in running order.
As can be seen, when electric furnace was worked, electric arc directly acted on the furnace charge that is loaded into, and for example by unfused metal derby still the time, can produce different connecing with rod iron 9 can situation.Owing to play the conductance layer 13 of electric action and 14 existence between the rod iron 9, just avoid the CURRENT DISTRIBUTION inequality that causes on the positive plate section substantially.And almost nonconducting magnesium oxide layer 12 makes heat distribute along copper coin shell direction, makes the little heat-resisting bed of material 13 and 14 that is positioned at the below avoid harmful Temperature Influence.
One of attached diagram.
Claims (5)
1, furnace bottom, the furnace bottom of direct current electric arc furnace particularly, a center graphite electrode and a some metal bar that circularizes distribution or rod irons that embed furnace bottom that go deep into burner hearth are arranged, its outer end is embedded in the block plate of metal furnace shell, it is characterized in that, in the scope of rod (9) or steel plate (7), have the nearly fire bed in top (12) and the bottom graphite linings (14) of a sheet combination and a middle bed of material (13) of forming by above-mentioned two kinds of materials of making by the magnesium oxide that contains chromium oxide at least.
2, furnace bottom according to claim 1, it is characterized in that, in the nearly fiery side magnesium oxide layer (12), by 90%(weight at least) magnesium oxide and 1.5%(weight) the magnesium oxide of chromium trioxide form, and the graphite linings of sheet combination (14), by 95%(weight at least) graphite form.
3, furnace bottom according to claim 1 and 2 is characterized in that, the middle bed of material of being made up of the graphite of magnesium oxide that contains chromium oxide and sheet combination (13) contains 20%-80% graphite (weight).
4, furnace bottom according to claim 1 and 2 is characterized in that nearly fiery side contains the magnesium oxide layer of chromium oxide (12) and accounts for 1/2nd of furnace bottom thickness at least.
5, furnace bottom according to claim 1, it is characterized in that the bed of material (13) and graphite linings (14) in the middle of the fiery nearly side magnesium oxide layer (12) be arranged on siege (4) interior up to central metal plate (7) all in the refractory lining of stepped indentation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101332 CN1008940B (en) | 1985-04-01 | 1985-04-01 | Be specially adapted to the furnace bottom of direct current electric arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101332 CN1008940B (en) | 1985-04-01 | 1985-04-01 | Be specially adapted to the furnace bottom of direct current electric arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101332A CN85101332A (en) | 1987-01-10 |
| CN1008940B true CN1008940B (en) | 1990-07-25 |
Family
ID=4791777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85101332 Expired CN1008940B (en) | 1985-04-01 | 1985-04-01 | Be specially adapted to the furnace bottom of direct current electric arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1008940B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304649C (en) * | 2005-05-17 | 2007-03-14 | 大连理工大学 | Direct-current arc furnace for preparing magnesium oxide single-crystal |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107032643B (en) * | 2017-06-20 | 2019-08-20 | 许玉蕊 | The device of liquid blast furnace production ornamental stone |
-
1985
- 1985-04-01 CN CN 85101332 patent/CN1008940B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304649C (en) * | 2005-05-17 | 2007-03-14 | 大连理工大学 | Direct-current arc furnace for preparing magnesium oxide single-crystal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85101332A (en) | 1987-01-10 |
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| CX01 | Expiry of patent term |