CN111270033A - Construction method for casting silica gel in gap between blast furnace shell and cooling wall - Google Patents
Construction method for casting silica gel in gap between blast furnace shell and cooling wall Download PDFInfo
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- CN111270033A CN111270033A CN202010166911.7A CN202010166911A CN111270033A CN 111270033 A CN111270033 A CN 111270033A CN 202010166911 A CN202010166911 A CN 202010166911A CN 111270033 A CN111270033 A CN 111270033A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
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Abstract
The invention discloses a construction method for casting silica gel in a gap between a blast furnace shell and a cooling wall. The method comprises the steps that the installation of the cooling wall and the pouring engineering of the silica gel are controlled in the vertical direction, and a belt pouring belt is installed from bottom to top; the water-ash ratio mass percentage of the castable for silica gel casting is 13.5-15% during material mixing, and the particle size ratio mass percentage of the castable larger than 5mm is below 16%; in the pouring construction process, more than 8 pouring points in the horizontal circumferential direction are poured each time, the pouring points in the same horizontal circumferential direction are poured simultaneously, and the liquid levels of the pouring points are on the same horizontal line; after each pouring, the initial setting layer of the silicon gel formed in 6-8 h at the upper part in the vertical direction is subjected to shell-breaking and roughening treatment. The invention eliminates the layered segregation, reduces the air gap, ensures the construction quality and prolongs the service life of the first-generation furnace of the blast furnace by the whole process control of the installation of the cooling wall, the gluing and allocation of the silica gel, the pouring construction process and the treatment of the initial setting layer after pouring.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a construction method for casting silica gel in a gap between a blast furnace shell and a cooling wall.
Background
In the process of blast furnace construction, after a blast furnace shell is welded, a cooling wall is installed, the thermal expansion factor of the cooling wall and the construction difficulty in the circumferential direction are considered, and gaps with enough space allowance can be reserved between the furnace shell and the cooling wall and between the cooling wall and the cooling wall. The clearance between the cooling wall and the cooling wall is compacted by ramming carbon filler, and the clearance between the furnace shell and the cooling wall is compacted by grouting.
At present, gaps between a furnace shell and a cooling wall for constructing a domestic blast furnace are filled by adopting a grouting method, and due to the difference of equipment grouting capacity, the existence of a control level of granularity larger than 5mm in a casting material and the layered segregation of liquid level in the solidification process of the casting material, gaps exist in the gaps between the whole furnace shell and the cooling wall after the casting, so that the construction quality is influenced, and the service life of the normal production and smelting of the blast furnace is influenced.
Disclosure of Invention
In order to control the separation of the furnace shell and the cooling wall after casting and the occurrence of air gaps and reduce the construction workload and the construction difficulty, the invention provides a whole-process construction scheme for the installation of the cooling wall for blast furnace construction, the gluing and allocation of silica gel, the casting construction process and the treatment of an initial setting layer after casting. The construction scheme can effectively eliminate the phenomenon of layered segregation after the silica gel castable is poured, reduce the air gap between the furnace shell and the cooling wall after pouring, ensure the construction quality and prolong the service life of the first-generation blast furnace.
In order to solve the problems, the invention adopts the technical scheme that:
the method comprises the following steps:
A. the installation of the cooling wall and the pouring engineering of the silica gel are controlled in the vertical direction, and a pouring belt is installed from bottom to top;
B. the water-ash ratio mass percentage of the castable for silica gel casting is controlled between 13.5 percent and 15 percent during mixing, and the particle size ratio mass percentage of the castable larger than 5mm is controlled below 16 percent;
C. in the pouring construction process, controlling the number of pouring points in the horizontal circumferential direction of each pouring to be more than 8, and controlling the pouring points in the same horizontal circumferential direction to be poured simultaneously, wherein the liquid levels of the pouring points are on the same horizontal line;
D. after each pouring, the initial setting layer of the silicon gel formed in 6-8 h at the upper part in the vertical direction is subjected to shell-breaking and roughening treatment.
In the above technical solution, a more specific technical solution may also be: and in the step A, controlling the vertical height of each pouring within 3.00 m.
Furthermore, the vertical height of each pouring is 1.5-2.5 m, and the vertical height is the vertical height of a cooling wall of a blast furnace.
Further, in the step B, the water ash proportion of the castable for silica gel casting is 14% by mass when the castable is mixed, and the granularity of more than 5mm in the castable is 12% by mass.
Further, in step C, 12 casting points in the horizontal circumferential direction are cast for each casting.
Further, in the step D, a sharp-pointed steel needle is used for chiseling the hard shell on the surface of the initial setting layer of the silicon gel into fur.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention eliminates the layered segregation, reduces the air gap, ensures the construction quality and prolongs the service life of the first-generation furnace of the blast furnace by the whole process control of the installation of the cooling wall, the gluing and allocation of the silica gel, the pouring construction process and the treatment of the initial setting layer after pouring.
2. According to the invention, the installation of the cooling wall and the pouring engineering of the silica gel are controlled to install a belt pouring belt from bottom to top in the vertical direction, and the vertical height of one-time pouring is controlled within 3.00m, so that the layering segregation in the vertical direction is eliminated, and the air gap at the lower part is reduced.
3. The silica gel casting material adopted by the invention is a self-flowing self-compacting casting material with no linear expansion and an experimental solidification shrinkage rate of 0.8%, and can effectively reduce the construction workload and the construction difficulty.
4. According to the invention, the water-cement proportion and the mass percentage of the castable for silica gel casting are controlled to be between 13.5 and 15 percent during mixing, and the particle size proportion and the mass percentage of the castable with the particle size of more than 5mm are controlled to be below 16 percent, so that the fluidity can be ensured, and the layered segregation in the solidification process can be reduced.
5. The invention reduces air gaps by controlling the number of pouring points in the horizontal circumferential direction of each pouring to be more than 8, removing segregation in the horizontal circumferential direction, and controlling the pouring points in the same horizontal circumferential direction to be poured simultaneously and the liquid levels of the pouring points to be on the same horizontal line.
6. According to the invention, after each pouring, the shell-breaking and roughening treatment is carried out on the silica gel initial setting layer formed in 6-8 h on the upper part in the vertical direction, so that the surface of the initial setting layer is cleaned, and the air gap formed in the previous layer during pouring is eliminated.
Drawings
FIG. 1 is a schematic view of a blast furnace with a cooling wall installed in a third zone, a gap between the cooling wall and the cooling wall is tamped tightly, and a gap between a furnace shell steel plate and the cooling wall is poured tightly after the installation and pouring platform is lifted.
FIG. 2 is a schematic diagram of pouring by selecting 12 silica gel pouring material pouring points in the horizontal circumferential direction.
FIG. 3 is a schematic diagram of the crust breaking and roughening of the initial setting layer of silicone gel.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
wherein 101 is a first blast furnace band, 102 is a second blast furnace band, 103 is a third blast furnace band, 104 is a fourth blast furnace band, 105 is a fifth blast furnace band, 106 is a sixth blast furnace band, 107 is a seventh blast furnace band, 108 is an eighth blast furnace band, 109 is a ninth blast furnace band, 110 is a tenth blast furnace band, 111 is a shell steel plate, 112 is a stave, 113 is a silica gel castable, 114 is a mounting and casting construction platform, 115 is a taphole center line, 116 is a tuyere center line, 117 is a blast furnace type interior, 118 is a gap between the shell steel plate and the stave, 119 is a silica gel castable, and 120 is a pointed steel pin.
Construction method for casting silica gel in gap between blast furnace shell and cooling wall in iron works No. 1 and No. 2 of Guangxi iron and Steel group Limited company3Which occurs during the construction of blast furnaces.
The installation of stave begins from the first area of blast furnace from up the installation down in the vertical direction, and when first area stave installation completion, carry out the charcoal material filler to the clearance between stave and the stave and tamp closely knit back, rise installation and casting platform to the first area stave up end of blast furnace, use the silica gel castable to pour closely to the clearance between stove outer covering steel sheet and the stave. The cooling wall is provided with a construction requirement of a belt of silica gel casting belt, the cooling wall of the upper layer can be upwards arranged only after the casting of the cooling wall on the same horizontal line is finished and the initial setting layer is subjected to crust breaking and roughening treatment, the vertical height of the primary casting is controlled to be the height of the cooling wall, the height meets the control requirement that the vertical height is within 3.00m, the layered segregation in the vertical direction is eliminated, and the air gap in the lower part is reduced. As shown in fig. 1, fig. 1 is a schematic diagram of the blast furnace in which the third cooling stave 112 is installed, the gap between the cooling stave 112 and the cooling stave 112 is rammed tightly, and the gap between the furnace shell steel plate 111 and the cooling stave 112 is poured tightly after the installation and pouring platform 114 is lifted.
In the implementation process of casting and compacting the gap between the furnace shell steel plate 111 and the cooling wall 112, the gluing and blending of the silica gel is controlled to be between 13.5% and 14% of the water-cement ratio when the stirring mixer takes materials. The grain size of the casting material with the grain size of more than 5mm is less than 16 percent, so that the layered segregation in the solidification process is reduced while the fluidity is ensured. The mixed casting material is sent to a mounting and casting platform 114 through a grouting machine guide pipe, 12 silica gel casting material casting points 113 are uniformly selected in the circumferential direction for casting as shown in fig. 2, segregation in the horizontal circumferential direction is eliminated, each silica gel casting material casting point 113 is controlled to be simultaneously cast in the casting process, the liquid level of each silica gel casting material casting point 113 is controlled to be on the same horizontal line, and air gaps are reduced.
As shown in fig. 3, after each belt is poured and poured with silica gel for 6h to 8h, an initial setting layer on the upper part of the silica gel pouring material 119 in the vertical direction is formed, at this time, a pointed steel needle 120 is used for carrying out shell breaking and roughening treatment on the initial setting layer, a hard shell on the surface of the initial setting layer is cleaned, surface burrs are chiseled, and air gaps formed during pouring of the previous layer are eliminated, so that infiltration and compaction during pouring of the previous layer are facilitated. And after the initial setting layer is subjected to shell breaking and roughening treatment, installing the cooling wall of the previous layer upwards, and performing silica gel pouring construction work on the gap between the steel plate with the furnace shell and the cooling wall according to the steps.
Claims (6)
1. A construction method for casting silica gel in a gap between a blast furnace shell and a cooling wall is characterized by comprising the following steps:
A. the installation of the cooling wall and the pouring engineering of the silica gel are controlled in the vertical direction, and a pouring belt is installed from bottom to top;
B. the water-ash ratio mass percentage of the castable for silica gel casting is controlled between 13.5 percent and 15 percent during mixing, and the mass percentage of the granularity larger than 5mm in the castable is controlled below 16 percent;
C. in the pouring construction process, controlling the number of pouring points in the horizontal circumferential direction of each pouring to be more than 8, and controlling the pouring points in the same horizontal circumferential direction to be poured simultaneously, wherein the liquid levels of the pouring points are on the same horizontal line;
D. after each pouring, the initial setting layer of the silicon gel formed in 6-8 h at the upper part in the vertical direction is subjected to shell-breaking and roughening treatment.
2. The construction method of the silica gel casting for the gap between the blast furnace shell and the cooling wall as claimed in claim 1, wherein: and in the step A, controlling the vertical height of each pouring within 3.00 m.
3. The construction method of the silica gel casting for the gap between the blast furnace shell and the cooling wall as claimed in claim 2, wherein: the vertical height of each pouring is 1.5 m-2.5 m.
4. The construction method of silica gel casting for the gap between the blast furnace shell and the cooling stave according to claim 1, 2 or 3, characterized in that: in the step B, the water ash proportion and the mass percentage of the castable for silica gel casting are 14% during mixing, and the particle size proportion existing in the castable larger than 5mm is 12%.
5. The method according to claim 4, wherein in step C, 12 casting points are provided in each casting in the horizontal circumferential direction.
6. The construction method of the silica gel casting for the gap between the blast furnace shell and the cooling wall as claimed in claim 5, wherein: and D, chiseling the hard shell on the surface of the initial setting layer of the silicon gel into hair by using a pointed steel needle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010166911.7A CN111270033A (en) | 2020-03-11 | 2020-03-11 | Construction method for casting silica gel in gap between blast furnace shell and cooling wall |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010166911.7A CN111270033A (en) | 2020-03-11 | 2020-03-11 | Construction method for casting silica gel in gap between blast furnace shell and cooling wall |
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| CN111270033A true CN111270033A (en) | 2020-06-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004323950A (en) * | 2003-04-28 | 2004-11-18 | Kurosaki Harima Corp | Method for manufacturing stave cooler for furnace wall in blast furnace |
| JP2011214076A (en) * | 2010-03-31 | 2011-10-27 | Jfe Steel Corp | Method for constructing furnace wall of blast furnace |
| CN104451008A (en) * | 2014-03-31 | 2015-03-25 | 江苏永钢集团有限公司 | Construction method for automatically-flowing refractory castable of blast furnace |
| CN107299173A (en) * | 2017-07-13 | 2017-10-27 | 上海二十冶建设有限公司 | Segmentation pours the filling method between cooling wall in blast furnace |
| CN109503173A (en) * | 2018-11-30 | 2019-03-22 | 河南华西耐火材料有限公司 | A kind of blast furnace cooling stave high-strength composite material, preparation method and its application in protection cooling wall |
-
2020
- 2020-03-11 CN CN202010166911.7A patent/CN111270033A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004323950A (en) * | 2003-04-28 | 2004-11-18 | Kurosaki Harima Corp | Method for manufacturing stave cooler for furnace wall in blast furnace |
| JP2011214076A (en) * | 2010-03-31 | 2011-10-27 | Jfe Steel Corp | Method for constructing furnace wall of blast furnace |
| CN104451008A (en) * | 2014-03-31 | 2015-03-25 | 江苏永钢集团有限公司 | Construction method for automatically-flowing refractory castable of blast furnace |
| CN107299173A (en) * | 2017-07-13 | 2017-10-27 | 上海二十冶建设有限公司 | Segmentation pours the filling method between cooling wall in blast furnace |
| CN109503173A (en) * | 2018-11-30 | 2019-03-22 | 河南华西耐火材料有限公司 | A kind of blast furnace cooling stave high-strength composite material, preparation method and its application in protection cooling wall |
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Application publication date: 20200612 |
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