CN104089484A - Method for building bottom of cupola furnace - Google Patents
Method for building bottom of cupola furnace Download PDFInfo
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- CN104089484A CN104089484A CN201410347810.4A CN201410347810A CN104089484A CN 104089484 A CN104089484 A CN 104089484A CN 201410347810 A CN201410347810 A CN 201410347810A CN 104089484 A CN104089484 A CN 104089484A
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Abstract
The invention relates to a method for building the bottom of a cupola furnace. According to the method for building the bottom of the cupola furnace, the bottom of the cupola furnace is composed of three layers from the bottom to top and the three layers of the cupola furnace are made of different materials. Firstly, the lower layer of the bottom of the cupola furnace is built through green sand, then the middle layer of the bottom of the cupola furnace is built through dry quartz feldspar sand, and ultimately, the upper layer of the bottom of the cupola furnace is built through a mixed material which is high in viscosity, strength and refractoriness. The method completely solves the problems that molten iron is leaked from the bottom of the cupola furnace and the bottom of the cupola furnace is difficult to knock off.
Description
Technical field
The present invention relates to a kind of manufacture of iron and steel by melting field, relate in particular to a kind of printing method of building of furnace cupola furnace bottom.
Background technology
At present traditional furnace cupola furnace bottom build printing method, often occur that furnace bottom metals run out or the furnace burdening afterwards that complete is difficult to the situation that ramming gets off.Particularly the every stove smelting time of the water jacket cupola of double shift reaches 10--20 hour, often occurs that furnace bottom is seriously metal run out by molten iron erosion or furnace bottom occurs crackle and metals run out in blow-on process.
If the intensity of the mixed system of the too thick or refractory material that furnace bottom is repaiied is too high, furnace burdening, through the high temperature sintering of the melting iron of long period, makes furnace burdening have very high intensity, needs 4--6 people when furnace burdening being destroyed after completion, ramming furnace burdening in turn, just gets off furnace burdening ramming for 3--5 hour sometimes.
If the low strength of the mixed system of furnace burdening, there will be again not resistance to molten iron to corrode and metals run out.Even if furnace burdening intensity and thickness are suitable, while destroying furnace bottom, also relatively require great effort.This problem perplexs foundry engieering worker for many years always.
Traditional furnace bottom technology for constructing is: its furnace bottom bottom material is built with the molding sand of moulding, and middle and upper part adds after fire clay mixes and builds with the molding sand of moulding.This technology for constructing is difficult to reach and neither can metals run out and situation that easily ramming gets off.
Because above-mentioned defect, the design people, actively research and innovation in addition, to founding a kind of printing method of building of furnace cupola furnace bottom, thoroughly solves an existing difficult problem, makes it have more the value in industry.
Summary of the invention
For solving the problems of the technologies described above, the object of this invention is to provide a kind of for solving the ubiquitous difficult problem of metalling run out and being difficult to destroy of furnace bottom.
A kind of furnace cupola furnace bottom of the present invention build printing method, from bottom up, point three layers of composition, adopt respectively different materials to build and beat furnace cupola furnace bottom;
First adopt green-sand to build furnace bottom lower floor;
Then adopt drystone English feldspathic sand to build furnace bottom intermediate layer;
Finally adopt by the compound of high viscosity, high strength, high refractoriness and build furnace bottom upper strata.
Further, described compound is formed by the modulation that adds water of the cast alumin(i)um powder of 70% quartzy feldspathic sand and 30%, and the granularity of the quartzy feldspathic sand of described compound is 40～100 orders.
Further, described compound mixed system 8～12 minutes in puddle mixer.
Further, described drystone English feldspathic sand moisture-free, granularity is 40～100 orders.
Further, the green-sand that described furnace bottom lower floor is used by common moulding is built.
Further, described furnace bottom upper surface tilts 3 ° to forehearth direction; Described furnace cupola sidewall is respectively equipped with eye of wind cap and lower air draft eye in furnace roof portion; Described lower air draft is just provided with gap bridge now; The described pars basilaris pontis of crossing is provided with refractory matter; Described furnace cupola bottom is provided with bottom door, is provided with furnace bottom stay pipe between bottom door crack between a door and its frame place and bottom surface, and furnace cupola bottom surrounding is provided with the stove leg that supports furnace cupola; Described furnace cupola inside sidewalls is coated with refractory lining.
By such scheme, the present invention at least has the following advantages:
The present invention, its furnace bottom upper layer material adopts the compound of high viscosity, high strength, high refractoriness to build, and to ensure that top furnace bottom has the performance of higher shock-resistant, high temperature resistant, resistance to molten iron erosion, reaches by the erosion of molten iron long period and not serious damage.
Furnace bottom intermediate layer adopts dry, resistant to elevated temperatures fine quartz feldspathic sand to build, because the good fluidity of this dry fine sand, there will not be crackle and metal run out, can be because of the large seepage molten iron in the gap between sand grains yet, again because the refractoriness of quartzy feldspathic sand is high, and meet high temperature liquid iron and easily form the brittle glass layer of dense refractory, in the time that molten iron corrodes this layer, not only dry fine quartz feldspathic sand can not float along molten iron, and resistance to molten iron washes away and erosion.
(its intensity is low, refractoriness is low) built by common green-sand by furnace bottom lower floor, and molten iron generally can not arrive this layer upper two-layer entirely eating away.
Therefore this furnace bottom build method there will not be the phenomenon at the bottom of runout.And because upper strata is high strength layer, the melting later stage is eaten away by molten iron substantially, and intermediate layer is brittle glass layer or unsintered dry sand, lower floor is common low intensive molding sand, therefore while completing rear cupola drop, bottom door one is opened, and furnace burdening just can fall automatically, do not need special messenger to disclose again and smash furnace burdening, only depend on the effect furnace burdening of gravity just can automatically be scattered.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of description, below with preferred embodiment of the present invention and coordinate accompanying drawing to be described in detail as follows.
Brief description of the drawings
Fig. 1 be furnace cupola furnace bottom of the present invention build printing method schematic diagram;
Fig. 2 is the structural representation of furnace cupola furnace bottom of the present invention.
1, furnace bottom upper strata; 2, furnace bottom intermediate layer; 3, furnace bottom lower floor; 4, eye of wind cap; 5, lower air draft eye; 6, pass a bridge; 7, refractory matter; 8, refractory lining; 9, bottom door; 10, furnace bottom stay pipe; 11, stove leg.
Detailed description of the invention
As shown in Figure 1, a kind of furnace cupola furnace bottom of the present invention build printing method, from bottom up, point three layers of composition, adopt respectively different materials to build and beat furnace cupola furnace bottom;
S1, first adopt green-sand build furnace bottom lower floor;
S2, then adopt drystone English feldspathic sand build furnace bottom intermediate layer;
S3, finally adopt by the compound of high viscosity, high strength, high refractoriness and build furnace bottom upper strata.
The present invention, its furnace bottom upper layer material adopts the compound of high viscosity, high strength, high refractoriness to build, to ensure that top furnace bottom has the performance of higher shock-resistant, high temperature resistant, resistance to molten iron erosion.
Furnace bottom intermediate layer adopts dry, resistant to elevated temperatures fine quartz feldspathic sand to build, because the good fluidity of this dry fine sand, there will not be crackle and metal run out, can be because of the large seepage molten iron in the gap between sand grains yet, again because the refractoriness of quartzy feldspathic sand is high, and meet high temperature liquid iron and easily form the brittle glass layer of dense refractory, in the time that molten iron corrodes this layer, not only dry fine quartz feldspathic sand can not float along molten iron, and resistance to molten iron washes away and erosion.
(its intensity is low, refractoriness is low) built by common green-sand by furnace bottom lower floor, and molten iron generally can not arrive this layer upper two-layer entirely eating away.
Therefore this furnace bottom build method there will not be the phenomenon at the bottom of runout.And because upper strata is high strength layer, the melting later stage is eaten away by molten iron substantially, and intermediate layer is brittle glass layer or unsintered dry sand, lower floor is common low intensive molding sand, therefore while completing rear cupola drop, bottom door one is opened, and furnace burdening just can fall automatically, do not need special messenger to disclose again and smash furnace burdening, only depend on the effect furnace burdening of gravity just can automatically be scattered.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
Embodiment mono-
The furnace cupola furnace bottom of present embodiment build printing method, the compound on furnace bottom upper strata is formed by the modulation that adds water of the cast alumin(i)um powder of 70% quartzy feldspathic sand and 30%, the granularity of the quartzy feldspathic sand of described compound is 40～100 orders.Compound is mixed system 8～12 minutes in puddle mixer.The drystone English feldspathic sand moisture-free in furnace bottom intermediate layer, granularity is 40～100 orders.The green-sand that furnace bottom lower floor is used by common moulding is built.
Embodiment bis-
As Fig. 2, present embodiment discloses a kind of furnace cupola furnace bottom, its bottom up, comprises the furnace bottom intermediate layer 2 that the furnace bottom lower floor 3 of being built by green-sand, quartzy feldspathic sand are built and the furnace bottom upper strata 1 of being built by the compound of high viscosity, high strength, high refractoriness successively.
Two fan bottom doors 9 are combined, and bottom door 9 are supported with furnace bottom stay pipe 10.
Build furnace bottom lower floor 3: build (its intensity is low, refractoriness is low) with common green-sand, on bottom door, with sledgehammer tamping, smash evenly, THICKNESS CONTROL is about 150mm green-sand uniform spreading.
Build furnace bottom intermediate layer 2: dry fine quartz feldspathic sand, uniform spreading is in the furnace bottom lower floor 3 that ramming is good, and the reality that tramps with one's feet is stepped on even, and THICKNESS CONTROL is in 150mm left and right.
Build furnace bottom upper strata 1: compound (by 70% quartzy feldspathic sand ++ 30% cast alumin(i)um powder adds suitable quantity of water and forms, described compound is mixed 8--12 minute processed in puddle mixer, when described compound is grabbed in hand, during by larger strength, can pinch agglomerating, and press...with one's finger after pressure, can be broken into fragmentary shape, illustrate that described mixture moisture content and mixed grind time are suitable, the granularity of the quartzy feldspathic sand of compound is 40--100 order.) uniform spreading is on the furnace bottom intermediate layer 2 that ramming is good, with sledgehammer tamping, smash evenly, THICKNESS CONTROL is in about 150mm, and to the forehearth direction 3 ° of C left and right that tilt, so that molten iron trickles to forehearth.
Can blow after adding coke, stone, iron charge in 1 surface, furnace bottom upper strata, blow-on fusing.
Below be only the preferred embodiment of the present invention; be not limited to the present invention; should be understood that; for those skilled in the art; do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (6)
- Furnace cupola furnace bottom build a printing method, it is characterized in that, from bottom up, point three layers of composition, adopt respectively different materials to build and beat described furnace cupola furnace bottom;First adopt green-sand to build furnace bottom lower floor;Then adopt drystone English feldspathic sand to build furnace bottom intermediate layer;Finally adopt by the compound of high viscosity, high strength, high refractoriness and build furnace bottom upper strata.
- A kind of furnace cupola furnace bottom as claimed in claim 1 build printing method, it is characterized in that, described compound is formed by the modulation that adds water of the cast alumin(i)um powder of 70% quartzy feldspathic sand and 30%, the granularity of the quartzy feldspathic sand of described compound is 40～100 orders.
- A kind of furnace cupola furnace bottom as claimed in claim 2 build printing method, it is characterized in that described compound mixed system 8～12 minutes in puddle mixer.
- A kind of furnace cupola furnace bottom as claimed in claim 1 build printing method, it is characterized in that, described drystone English feldspathic sand moisture-free, granularity is 40～100 orders.
- A kind of furnace cupola furnace bottom as claimed in claim 3 build printing method, it is characterized in that, the green-sand that described furnace bottom lower floor is used by common moulding is built.
- A kind of furnace cupola furnace bottom as claimed in claim 1 build printing method, it is characterized in that, described furnace bottom upper surface tilts 3 ° to forehearth direction; Described furnace cupola sidewall is respectively equipped with eye of wind cap and lower air draft eye in furnace roof portion; Described lower air draft is just provided with gap bridge now; The described pars basilaris pontis of crossing is provided with refractory matter; Described furnace cupola bottom is provided with bottom door, is provided with furnace bottom stay pipe between bottom door crack between a door and its frame place and bottom surface, and furnace cupola bottom surrounding is provided with the stove leg that supports furnace cupola; Described furnace cupola inside sidewalls is coated with refractory lining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410347810.4A CN104089484A (en) | 2014-07-21 | 2014-07-21 | Method for building bottom of cupola furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410347810.4A CN104089484A (en) | 2014-07-21 | 2014-07-21 | Method for building bottom of cupola furnace |
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| CN104089484A true CN104089484A (en) | 2014-10-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102674A (en) * | 1986-04-17 | 1987-02-11 | 青岛市第一铸造厂 | Smelting cast technique in cupola furnace at high carburetting and strong reducing state |
| JPH04110594A (en) * | 1990-08-31 | 1992-04-13 | Kawasaki Steel Corp | Method of repairing refractory lining with padding |
| CN1932423A (en) * | 2006-10-30 | 2007-03-21 | 刘年路 | Double-layer multi-air door cupola |
| CN102297582A (en) * | 2010-06-24 | 2011-12-28 | 史忠群 | Mobile hot-blast cupola |
| JP5463262B2 (en) * | 2010-11-09 | 2014-04-09 | 品川リフラクトリーズ株式会社 | Blast furnace |
-
2014
- 2014-07-21 CN CN201410347810.4A patent/CN104089484A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102674A (en) * | 1986-04-17 | 1987-02-11 | 青岛市第一铸造厂 | Smelting cast technique in cupola furnace at high carburetting and strong reducing state |
| JPH04110594A (en) * | 1990-08-31 | 1992-04-13 | Kawasaki Steel Corp | Method of repairing refractory lining with padding |
| CN1932423A (en) * | 2006-10-30 | 2007-03-21 | 刘年路 | Double-layer multi-air door cupola |
| CN102297582A (en) * | 2010-06-24 | 2011-12-28 | 史忠群 | Mobile hot-blast cupola |
| JP5463262B2 (en) * | 2010-11-09 | 2014-04-09 | 品川リフラクトリーズ株式会社 | Blast furnace |
Non-Patent Citations (2)
| Title |
|---|
| 王岳军: "用石英砂打结冲天炉炉底", 《铸造》 * |
| 编写组编: "《铸工技术》", 31 December 1973, 国防工业出版社 * |
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Application publication date: 20141008 |