CN103981315B - A kind of pouring procedure of blast-furnace tuyere liner - Google Patents
A kind of pouring procedure of blast-furnace tuyere liner Download PDFInfo
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- CN103981315B CN103981315B CN201410183362.9A CN201410183362A CN103981315B CN 103981315 B CN103981315 B CN 103981315B CN 201410183362 A CN201410183362 A CN 201410183362A CN 103981315 B CN103981315 B CN 103981315B
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Abstract
The present invention discloses a kind of pouring procedure of blast-furnace tuyere liner, it is characterized in that: comprise the following steps: (1) prepares mould material: select high thermal conductive silicon colloidal sol in conjunction with gravity flow pouring material, thermal conductivity is greater than 10W/mK; (2) cast mould is made: cast mould is the cylinder of boring, and back end inside diameter is 175-180mm, and front inner diameter is 158-162mm; (3) simple and easy shaking table is set: get that one piece of thickness is 10mm, area is 1m
2steel plate, steel plate puts tuyere position tiling 15mm sand, and air port is put into position; (4) pour into a mould: in the cavity in mould and air port, inject mould material.The present invention directly pours into a mould in air port, can ensure that the resistance to material of high heat conduction is with air port inwall close contact, strengthens the cooling protection to the resistance to material in air port, improves cooling intensity, prolongs life; Liner scaling loss can be reduced again, stablize air supply areas, reduce coal powder injection wearing and tearing air port, create conditions to smooth operation of furnace.
Description
Technical field
The present invention relates to a kind of pouring procedure of blast-furnace tuyere liner, belong to technical field of refractory materials.
Background technology
Current 4350 blast-furnace tuyeres adopt same size, and length is 695mm, and leading portion internal diameter is φ 160mm, rear portion internal diameter is φ 180 mm, select the air outlet collocation adjustment air port area of suitable dimension in use according to processing requirement, because air port inwall exists casting tolerance, air outlet collocation has cast tolerance, when selecting air outlet collocation size, consider two aspect factors, undersized, can not with air port inwall close contact in using, cause cooling not, the easy scaling loss in front end.Work-ing life, short, air supply areas variable effect blast furnace normally ran.
Summary of the invention
In order to overcome above-mentioned deficiency, the present invention aims to provide a kind of pouring procedure of blast-furnace tuyere liner, and the high heat conduction of former Blast Furnace Bottom, high silicon carbide gravity flow pouring material are used for liner in pouring in air port after changing bonding agent add-on and size composition; Cancel air outlet collocation, adopt gravity flow pouring material to carry out the method for liner in pouring in air port.
The pouring procedure of a kind of blast-furnace tuyere liner provided by the invention, comprises the following steps:
(1) mould material is prepared: select high thermal conductive silicon colloidal sol in conjunction with gravity flow pouring material, thermal conductivity is greater than 10 W/mK:
4350m selected by the resistance to material of high heat conduction
3large Scale BF furnace bottom silicon sol is in conjunction with highly-conductive hot carbon SiClx gravity flow pouring material: silicon sol: the ratio of sic powder is 8 ~ 12:100, and this mould material has higher thermal conductivity: be greater than 10 W/mK, medium and high temperature strength is high, good fluidity.
The specific targets of gained gravity flow pouring material see the following form:
When above-mentioned gravity flow pouring material uses as furnace bottom mould material, bonding agent add-on is 10-12%, and maximum particle size is more than 5mm.During using above-mentioned furnace bottom gravity flow pouring material as air port inner lining pouring material, its maximum particle size≤3mm, bonding agent add-on should be 8-10%.
(2) cast mould is made
Cast mould is the cylinder of boring, and back end inside diameter is 175-180mm, and front inner diameter is 158-162mm;
In air port, the preparation method of liner in pouring mould is:
Cast mould surrounds round table-like docking by the iron sheet that 1mm is thick and forms cylinder, cylinder is positioned at air port, cylinder is along the circumferential direction provided with a circle ring baffle outward, baffle plate material is the iron sheet that 1.5mm is thick, ring baffle is made up of two semicircular ring, ring baffle and form a cavity between cylinder and air port, and ring baffle point is welded in outside cylinder, baffle plate is radial is provided with two mould material inlets to lining position, and the length of inlet is 15cm.
Described ring baffle external diameter is 175mm, and internal diameter is divided into third gear, is 145mm, 135mm, 125mm respectively; Barrier width is three class, be respectively 15mm corresponding to internal diameter, 20mm, 25mm be welded on mould.
(3) simple and easy shaking table is set: get that one piece of thickness is 10mm, area is 1m
2steel plate, steel plate puts tuyere position tiling 15mm sand, and air port is put into position.
(4) pouring procedure
1. mould is put into air port inwall, adjustment is in place; Prepare to inject mould material in the cavity in mould and air port;
2. start to stir gravity flow pouring material, after being dry mixed 3 minutes, add 8-10% bonding agent in proportion, stir and pour in plastic tank in 3 ~ 5 minutes;
3. vibrate on simple and easy shaking table with vibrating head, the mould material be stirred is poured into from mould material inlet, change another mould material inlet material filling when baffle orifice starts flash, guarantee the density of air port liner gravity flow pouring material;
4. natural curing demoulding after 24 hours, is placed on trench cover by the air port after cast, temperature 100 DEG C ~ 200 DEG C, for subsequent use after dry 24 hours.
Of the present invention
beneficial effect:
The present invention takes the method for directly pouring into a mould in air port, can ensure that the resistance to material of high heat conduction is with air port inwall close contact, strengthens the cooling protection to the resistance to material in air port, improves cooling intensity, prolongs life; Liner scaling loss can be reduced again, stablize air supply areas, reduce coal powder injection wearing and tearing air port, create conditions to smooth operation of furnace.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment 1:
(1) mould material is prepared: select high thermal conductive silicon colloidal sol in conjunction with gravity flow pouring material, thermal conductivity is greater than 10 W/mK:
4350m selected by the resistance to material of high heat conduction
3large Scale BF furnace bottom silicon sol is in conjunction with highly-conductive hot carbon SiClx gravity flow pouring material: silicon sol: sic powder=12:100, and this mould material has higher thermal conductivity: be greater than 10 W/mK, medium and high temperature strength is high, good fluidity.
The specific targets of gained gravity flow pouring material are in table 1:
Table 1
When above-mentioned gravity flow pouring material uses as furnace bottom mould material, bonding agent add-on is 10-12%, maximum particle size >=5mm.During using above-mentioned furnace bottom gravity flow pouring material as air port inner lining pouring material, its maximum particle size answers≤3mm, and bonding agent add-on should be 8-10%.
(2) cast mould is made
The iron sheet that cast mold material selection 1mm is thick surrounds garden mesa-shaped docking and forms, and baffle plate material is the iron sheet that 1mm is thick.In air port, the preparation method of liner in pouring mould is:
Cast mould surrounds round table-like docking by the iron sheet that 1mm is thick and forms cylinder, cylinder is positioned at air port, cylinder is along the circumferential direction provided with a circle ring baffle outward, baffle plate material is the iron sheet that 1.5mm is thick, ring baffle is made up of two semicircular ring, ring baffle and form a cavity between cylinder and air port, and ring baffle point is welded in outside cylinder, baffle plate is radial is provided with two mould material inlets to lining position, and the length of inlet is 15cm.
Described ring baffle external diameter is 175mm, and internal diameter is divided into third gear, is 145mm, 135mm, 125mm respectively; Barrier width is three class, be respectively 15mm corresponding to internal diameter, 20mm, 25mm be welded on mould.
(3) simple and easy shaking table is set: get that one piece of thickness is 10mm, area is 1m
2steel plate, steel plate puts tuyere position tiling 15mm sand, and air port is put into position.
(4) pouring procedure
1. mould is put into air port inwall, adjustment is in place; Prepare to inject mould material in the cavity in mould and air port;
2. start to stir gravity flow pouring material, after being dry mixed 3 minutes, add 8-10% silicon sol in proportion, stir and pour in plastic tank in 3 ~ 5 minutes;
3. vibrate on a vibration table with vibrating head, the mould material be stirred is poured into from mould material inlet, change another mould material inlet material filling when baffle orifice starts flash, guarantee the density of air port liner gravity flow pouring material;
4. natural curing demoulding after 24 hours, be placed on trench cover by the air port after cast, temperature is 100 DEG C ~ 200 DEG C, for subsequent use after dry 24 hours.
Claims (5)
1. a pouring procedure for blast-furnace tuyere liner, is characterized in that: comprise the following steps:
(1) prepare mould material: select high thermal conductive silicon colloidal sol in conjunction with gravity flow pouring material: silicon sol is bonding agent, silicon carbide is powder, and the ratio of the two is 8 ~ 12:100, and thermal conductivity is greater than 10 W/mK;
(2) cast mould is made
Cast mould is the cylinder of boring, and back end inside diameter is 175-180mm, and front inner diameter is 158-162mm;
The preparation method of described cast mould is:
Cast mould surrounds round table-like docking by the iron sheet that 1mm is thick and forms cylinder, cylinder is positioned at air port, cylinder is along the circumferential direction provided with a circle ring baffle outward, and baffle plate material is the iron sheet that 1.5mm is thick, and ring baffle is made up of two semicircular ring, ring baffle and form cavity between cylinder and air port, ring baffle point is welded in outside cylinder, and baffle plate is radial is provided with two mould material inlets to lining position, and the length of inlet is 15cm, baffle plate external diameter is 175mm, and internal diameter is 125 ~ 145mm; Barrier width is 15 ~ 25mm;
(3) simple and easy shaking table is set: get that one piece of thickness is 10mm, area is 1m
2steel plate, steel plate puts tuyere position tiling 15mm sand, and air port is put into position;
(4) pour into a mould:
1. mould is put into air port inwall, adjustment is in place; Prepare to inject mould material in the cavity in mould and air port;
2. start to stir gravity flow pouring material, after being dry mixed 3 minutes, add 8-10% bonding agent in proportion, stir and pour in plastic tank in 3 ~ 5 minutes;
3. vibrate on simple and easy shaking table with vibrating head, the mould material be stirred is poured into from mould material inlet, change another mould material inlet material filling when baffle orifice starts flash, guarantee the density of air port liner gravity flow pouring material;
4. natural curing demoulding after 24 hours, is placed on trench cover by the air port after cast, temperature 100 DEG C ~ 200 DEG C, for subsequent use after dry 24 hours.
2. the pouring procedure of blast-furnace tuyere liner according to claim 1, is characterized in that: when described gravity flow pouring material uses as furnace bottom mould material, and bonding agent add-on is 10-12%, maximum particle size >=5mm.
3. the pouring procedure of blast-furnace tuyere liner according to claim 1, is characterized in that: when described gravity flow pouring material is as air port inner lining pouring material, its maximum particle size≤3mm, and bonding agent add-on is 8-10%.
4. the pouring procedure of blast-furnace tuyere liner according to claim 1, is characterized in that: the index of described mould material is:
Linear change rate: 515 DEG C × 3hr-0.1 ~ 0%
1400℃×3hr -0.1~0.4%
Folding strength: 110 DEG C × 24hr >=3.7MPa
515℃×3h ≥7.6MPa
1400℃×3hr ≥13.8MPa
Apparent porosity: 110 DEG C × 24h≤18.2%
515℃×3h ≤19.1%
Compressive strength: 110 DEG C × 24h >=17.2MPa
515℃×3h ≥37.2MPa
1400℃×3hr ≥ 69MPa
Chemical composition: Al
2o
39 ~ 13%
SiC 77～82 %
SiO
27.6～9.3%
Thermal conductivity: 21 DEG C of 15.2W/m.k.
5.
the pouring procedure of blast-furnace tuyere liner according to claim 1, is characterized in that: when the internal diameter of described baffle plate is 125mm, and the width of baffle plate is 25mm; When the internal diameter of baffle plate is 135mm, the width of baffle plate is 20mm; When the internal diameter of baffle plate is 145mm, the width of baffle plate is 15mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410183362.9A CN103981315B (en) | 2014-05-04 | 2014-05-04 | A kind of pouring procedure of blast-furnace tuyere liner |
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| CN103981315B true CN103981315B (en) | 2015-11-04 |
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| CN112123544B (en) * | 2020-09-19 | 2022-06-14 | 河南华西耐火材料有限公司 | Construction method of integrated full-cast refractory structure applied to blast furnace lining |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186517A (en) * | 2007-12-03 | 2008-05-28 | 中钢集团耐火材料有限公司 | Corundum-silicon nitride-silicon carbide composite pouring material |
| CN102827980A (en) * | 2012-07-20 | 2012-12-19 | 宣化钢铁集团有限责任公司 | Construction method for casting material in area of blast-furnace tuyere without supporting die |
| CN102994676A (en) * | 2012-12-20 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Small wear-resistant bush for blast-furnace tuyere and manufacture method thereof |
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2014
- 2014-05-04 CN CN201410183362.9A patent/CN103981315B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186517A (en) * | 2007-12-03 | 2008-05-28 | 中钢集团耐火材料有限公司 | Corundum-silicon nitride-silicon carbide composite pouring material |
| CN102827980A (en) * | 2012-07-20 | 2012-12-19 | 宣化钢铁集团有限责任公司 | Construction method for casting material in area of blast-furnace tuyere without supporting die |
| CN102994676A (en) * | 2012-12-20 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Small wear-resistant bush for blast-furnace tuyere and manufacture method thereof |
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