CN1417353A - Production process of premelt calciun aluminate slag - Google Patents
Production process of premelt calciun aluminate slag Download PDFInfo
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- CN1417353A CN1417353A CN 01132169 CN01132169A CN1417353A CN 1417353 A CN1417353 A CN 1417353A CN 01132169 CN01132169 CN 01132169 CN 01132169 A CN01132169 A CN 01132169A CN 1417353 A CN1417353 A CN 1417353A
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Abstract
The production of premelt calcium aluminate slag is performed in an AC steel making arc furnace and includes the following steps: setting batch in the arc furnace and between three electrodes and one conducting material below the electrodes; turning on the power supply to start arc and smelt; discharging partial molten slag while leaving small amount of slag for arc starting in the next heat. The said production process can produce calcium aluminate slag with low carbon, silica and other impurity content, high melting point and is used in metallurgical and cement production.
Description
Technical field:
The present invention relates to produce the technical field of the pre-melted aluminium and calcium slag method that steel-making subsidiary material or cement uses, specifically a kind of electric furnace arrangement for producing steel that mainly is applicable to is produced the method for pre-melted aluminium and calcium slag.
Background technology:
The equipment that pre-melted aluminium and calcium slag is commonly used is cupola furnace at present, cupola furnace fusion aluminium calcium slag advantage is that cost is low, but can't produce high-quality or dystectic pre-melt, because used fuel is coke, coke burning back ash content all enters in the slag, influenced the chemical ingredients of aluminium calcium slag, the aluminium calcium slag impurity that general cupola furnace is produced is higher, carbon content greater than 0.15%, silicon-dioxide is greater than 2%, and STRENGTH ON COKE requires than higher, require coke impurity low, and the aluminium calcium slag of producing can't satisfy the needs of some metallurgy or cement aspect; For metallurgical external refining, because aluminium calcium slag generally directly contacts with molten steel under reducing atmosphere, impurity directly is reduced and enters in the molten steel in the aluminium calcium slag like this, as in the production of ultra low-carbon steel, adopt the aluminium calcium slag of cupola furnace production often to cause molten steel recarburization to exceed standard, make the ultra low-carbon steel of high added value be forced to become low value-added steel grade, make steel mill suffer enormous economic loss.
Summary of the invention:
The objective of the invention is to solve the problem that present fritting means are run into, a kind of production method of producing pre-melted aluminium and calcium slag is provided, it pollutes little to slag, can produce the high-melting-point aluminium calcium slag.
Technical scheme of the present invention is achieved in that a kind of production method of producing pre-melted aluminium and calcium slag, it is characterized in that: below three electrodes that exchange the electric furnace arrangement for producing steel furnace bottom, put an electro-conductive material, raw material is placed between electrode and the electro-conductive material, carries out according to the following steps then:
A, new stove or the black furnace first stove blow-on confected materials in advance are put into earlier and pave in the electric arc furnace, below electrode, dig a hole, the size in hole will hold electrode, the hole dark for the end, hole apart from furnace bottom place electro-conductive material less than 10 centimetres, in the hole, be sprinkled into into 1～15 kilogram of metal powder, connect power supply, end when electrode drops to the starting the arc, beginning is fusing normally;
B, treat to slag tap after the fusing of whole raw materials, slag tap and all to go out clearly, should stay a small amount of residue, be beneficial to down the stove starting the arc at furnace bottom;
C, electrode descend and insert the residue that stays in the electric arc furnace, and electrode can not contact with furnace bottom, add the raw material energising, the electrode starting the arc, and raw material begins fusing, following furnace operating in the electric arc furnace.
The aluminium calcium slag that adopts the present invention to produce is little to the pollution of slag, and impurity such as this aluminium calcium slag carbon containing, sulphur, silicon-dioxide are lower, and carbon content is less than 0.05%, and silicon-dioxide is less than 1.5%, and the fusing point height can satisfy the needs of some metallurgy or cement aspect.
Embodiment:
Below the present invention is further described and provides embodiment.
The present invention is a kind of production method of producing pre-melted aluminium and calcium slag, and it is different from prior art and is: put an electro-conductive material below three electrodes that exchange the electric furnace arrangement for producing steel furnace bottom, raw material is placed between electrode and the electro-conductive material, carry out according to the following steps then:
A, new stove or the black furnace first stove blow-on confected materials in advance are put into earlier and pave in the electric arc furnace, below electrode, dig a hole, the size in hole will hold electrode, the hole dark for the end, hole apart from furnace bottom place electro-conductive material less than 10 centimetres, in the hole, be sprinkled into metal powder, connect power supply, end when electrode drops to the starting the arc, beginning is fusing normally;
B, treat to slag tap after the fusing of whole raw materials, slag tap and all to go out clearly, should stay a small amount of residue, be beneficial to down the stove starting the arc at furnace bottom;
C, electrode descend and insert the residue that stays in the electric arc furnace, and electrode can not contact with furnace bottom, add the raw material energising, the electrode starting the arc, and raw material begins fusing in the electric arc furnace.
Electro-conductive material best in the enforcement is that graphite brick is piled up, electrode block or steel scrap, if adopt graphite brick, between graphite brick, adopt electrode paste to fill, also adopting electrode paste to lead at the furnace bottom of electric arc furnace beats, as to adopt electrode block the best be that two cube electrode pieces intersect and to put, under three electrodes of electric arc furnace furnace bottom, put an electro-conductive material during enforcement, under electrode, dig a hole, graphite brick is piled up or electrode block be placed in electrode under, metal powder is an aluminium powder, copper powder or iron powder, their diameter is the 0.1-3 millimeter, and the weight percent of described raw material optimum formula is aluminium sesquioxide 65-90%, calcium oxide 10-35%.
Embodiment 1:
Get 25% unslaked lime (Cao＞90%), 75% bauxitic clay grog (Al
2O
3＞80%), its granularity is 0～50mm, more than behind two kinds of starting material thorough mixing, by following technological operation: pile up with graphite brick at ac arc furnace bottom electrode distribution circle center, the graphite brick area size is greater than three formed cylindricals of electrode, fill with electrode paste between the graphite brick, to reach whole graphite brick district conduction, other zones are led with electrode paste and are beaten beyond the graphite brick.The ac arc furnace furnace bottom is carried out in operation (1) as stated above according to the following steps then; (2) new stove or the black furnace first stove blow-on; above confected materials in advance is added in the electric arc furnace earlier paves; under every electrode, dig a hole; the hole size will hold electrode; the hole dark for the end, hole apart from furnace bottom less than 15cm; in the hole, be sprinkled into aluminium powder; when dropping to the starting the arc, ends at electrode, beginning normalizing slag, and its power supply system is: charging begins to adopt 120V/2500A; behind slightly steady 10 minutes of the electric arc; along with the molten bath forms gradually, electric current raises gradually, after 30 minutes; being stabilized in 140～150V/4000～4250A power supply (3) treats to slag tap after whole furnace charge fusings; slag tap and all to go out clearly, should stay about 100 kilograms of residues, be beneficial to down the stove starting the arc at furnace bottom; (4) electrode decline is inserted and is stayed slag (can not contact with the furnace bottom electro-conductive material), adds the raw material energising and descends furnace operating.
Embodiment 2:
Get Wingdale (Cao＞55%) 25%, bauxitic clay grog (Al
2O
3＞80%) 75%, its granularity is 0～50mm, more than behind two kinds of starting material thorough mixing, by following technological operation: set two above electrode blocks at ac arc furnace bottom electrode distribution circle center, all the other operation stepss are the same.
Embodiment 3: get 15% unslaked lime (Cao＞90%), 85% bauxitic clay grog (Al
2O
3＞80%), its granularity is 0～50mm, more than behind two kinds of starting material thorough mixing, by following technological operation: put the frivolous steel scrap piece of 500-1000 kilogram at ac arc furnace bottom electrode distribution circle center, all the other operation stepss are with embodiment 1.
Claims (8)
1, a kind of production method of producing pre-melted aluminium and calcium slag is characterized in that: put an electro-conductive material below three electrodes that exchange the electric furnace arrangement for producing steel furnace bottom, raw material is placed between electrode and the electro-conductive material, carry out according to the following steps then:
A, new stove or the black furnace first stove blow-on confected materials in advance are put into earlier and pave in the electric arc furnace, below electrode, dig a hole, the size in hole will hold electrode, the hole dark for the end, hole apart from the electro-conductive material at furnace bottom place less than 10 centimetres, in the hole, be sprinkled into metal powder, connect power supply, end when electrode drops to the starting the arc, beginning is fusing normally;
B, treat to slag tap after the fusing of whole raw materials, slag tap and all to go out clearly, should stay a small amount of residue, be beneficial to down the stove starting the arc at furnace bottom;
C, electrode descend and insert the residue that stays in the electric arc furnace, and electrode can not contact with furnace bottom, add the raw material energising, the electrode starting the arc, and raw material begins fusing in the electric arc furnace.
2, by the described a kind of production method of producing pre-melted aluminium and calcium slag of claim 1, it is characterized in that: best electro-conductive material is that graphite brick is piled up, electrode block or steel scrap.
3, by claim 1 or 2 described a kind of production methods of producing pre-melted aluminium and calcium slag, it is characterized in that: between graphite brick, adopt electrode paste to fill, also adopt electrode paste to lead at the furnace bottom of electric arc furnace and beat.
4, by claim 1 or 2 described a kind of, it is characterized in that: electrode block the best is that two cube electrode pieces intersect and put.
5, by the described a kind of production method of producing pre-melted aluminium and calcium slag of claim 1, it is characterized in that: under three electrodes of electric arc furnace furnace bottom, put an electro-conductive material, under electrode, dig a hole, graphite brick is piled up or electrode block be placed in electrode under.
6, by the described a kind of production method of producing pre-melted aluminium and calcium slag of claim 1, it is characterized in that: metal powder is aluminium powder, copper powder or iron powder, and their diameter is the 0.1-3 millimeter.
7, by the described a kind of production method of producing pre-melted aluminium and calcium slag of claim 1, it is characterized in that: the weight percent of described raw material optimum formula is aluminium sesquioxide 65-90%, calcium oxide 10-35%.
8, by the described a kind of production method of producing pre-melted aluminium and calcium slag of claim 1, it is characterized in that: the conductive region area that electric arc furnace furnace bottom graphite brick is piled up is greater than the distribution of electrodes area of a circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01132169 CN1417353A (en) | 2001-11-09 | 2001-11-09 | Production process of premelt calciun aluminate slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01132169 CN1417353A (en) | 2001-11-09 | 2001-11-09 | Production process of premelt calciun aluminate slag |
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| Publication Number | Publication Date |
|---|---|
| CN1417353A true CN1417353A (en) | 2003-05-14 |
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ID=4671209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01132169 Pending CN1417353A (en) | 2001-11-09 | 2001-11-09 | Production process of premelt calciun aluminate slag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352955C (en) * | 2005-12-26 | 2007-12-05 | 内蒙古科技大学 | Preparation method of pre-melting electroslag |
| CN113292321A (en) * | 2021-06-23 | 2021-08-24 | 郑州振东科技有限公司 | Steel ladle low-carbon working lining brick |
-
2001
- 2001-11-09 CN CN 01132169 patent/CN1417353A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352955C (en) * | 2005-12-26 | 2007-12-05 | 内蒙古科技大学 | Preparation method of pre-melting electroslag |
| CN113292321A (en) * | 2021-06-23 | 2021-08-24 | 郑州振东科技有限公司 | Steel ladle low-carbon working lining brick |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |