In the blast furnace smelting process, blast furnace taphole clay, as a key plastic material, plays a vital role. This article will introduce in detail the product characteristics, working principle and innovation of blast furnace taphole clay in improving furnace stability and production efficiency.
Item NO.:
YYH-085Payment:
T/TProduct Origin:
CHINALead Time:
7-15Blast furnace taphole clay is a special refractory material used to seal the tap hole of a blast furnace. Its main function is to prevent the leakage of high-temperature materials such as molten iron and slag, while maintaining the stability of the tap hole. In recent years, with the continuous development of ironmaking technology and the trend of large-scale blast furnaces, the performance requirements for tap clay are getting higher and higher. In addition to conventional anhydrous tap clay products, Yuying Refractory Materials also supplies a variety of functional tap clay products, such as environmentally friendly tap clay, titanium-precision furnace protection tap clay, anti-splashing tap clay, tap hole expansion tap clay, high-strength tap clay and single tap hole tap clay.
Blast furnace models are usually divided according to their effective volume, which refers to the volume inside the blast furnace that can be used for ironmaking. According to the effective volume, blast furnaces can be divided into small blast furnaces (less than 1,000 cubic meters), medium blast furnaces (1,000-2,000 cubic meters) and large blast furnaces (greater than 2,000 cubic meters). Optimization of taphole clay formula for different types of blast furnaces
Since the furnace body of a small blast furnace is small and the temperature inside the furnace is relatively low, the high temperature resistance requirements of the taphole clay are relatively low. Therefore, the formula of taphole clay for small blast furnaces should focus on improving wear resistance and adhesion.
(1) Improving wear resistance: Add a certain proportion of wear-resistant materials such as silicon carbide and alumina to the taphole clay formula to improve the wear resistance of the taphole clay.
(2) Adhesion: Add binders such as clay and cement to the taphole clay formula to improve the adhesion of the taphole clay.
Optimization of the formula of medium-sized blast furnace cannon clay
The furnace body of a medium-sized blast furnace is larger and the temperature inside the furnace is higher, which requires the cannon clay to have higher high temperature resistance and wear resistance. Therefore, the formula of medium-sized blast furnace cannon clay should focus on improving high temperature resistance and wear resistance.
(1) Improve high temperature resistance: Add a certain proportion of high temperature clay, alumina and other high temperature resistant materials to the cannon clay formula to improve the high temperature resistance of the cannon clay.
(2) Improve wear resistance: Add an appropriate amount of silicon carbide, alumina and other wear resistant materials to the cannon clay formula to improve the wear resistance of the cannon clay.
Optimization of the formula of large blast furnace cannon clay
The furnace body of a large blast furnace is larger and the temperature inside the furnace is higher, which requires the cannon clay to have higher high temperature resistance, wear resistance and adhesion. Therefore, the formula of large blast furnace cannon clay should focus on improving high temperature resistance, wear resistance and adhesion.
(1) Improve high temperature resistance: Add a certain proportion of high temperature clay, alumina and other high temperature resistant materials to the cannon clay formula to improve the high temperature resistance of the cannon clay.
(2) Improve wear resistance: Add appropriate amount of wear-resistant materials such as silicon carbide and alumina to the cannon mud formula to improve the wear resistance of the cannon mud.
(3) Improve adhesion: Add appropriate amount of binders such as clay and cement to the cannon Tap Hole Clay formula to improve the adhesion of the Tap Hole Clay
New -type Non -water Tap Hole Clay
In view of the existence of tide mud in the waterless mud, it is difficult to open holes, and the performance is not good.
We have adopted improved production processes, dehydrated the raw materials and binders several times, and produced new types of non-aqueous mud products.
The plasticity of this product is higher than that of ordinary anhydrous artillery mud. It has strong adhesion, good wear resistance, fast sintering speed, and easy to drill iron holes. It is mainly suitable for 300m3-2500m, blast furnace, and can achieve no mud and no reaming. , To control the flow rate of molten iron, reduce the consumption of artillery mud, ensure the depth of the iron mouth, and improve operating conditions.
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Test item
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Chemical composition
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Cold compressive strength （MPa）
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bending strengthMpa Mpa |
linear change rate % |
Bulk density g/cm3 |
|||
|
Al2O3 |
SiC |
FC |
200℃×24h |
1350℃×3h |
1350℃×3h |
1350℃×3h |
1350℃×3h |
|
|
HXPN-1 |
≥30 |
≥10 |
≥10 |
≥4.5 |
≥8 |
≥3 |
±1.5 |
≥1.65 |
|
Remark |
This parameter is for reference only. The smelting products and operation methods should be studied to determine the effect of the blast furnace. The furnace conditions should be adjusted accordingly. |
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Environmentally friendly waterless taphole mud
At present, the anhydrous cannon mud that truly meets the requirements of environmental protection in China is still blank. It is difficult for traditional tar combined with cannon mud to meet environmental protection requirements. Yuying refractory meets the domestic and foreign markets as a breakthrough. It cooperates with France in technology and uses original imported binders to counteract harmful components contained in slag iron through inversion. In addition, it reacts with additives to make the content of stupid pyrene less than 5PPM ( 1 ton of mortar contains 5 grams of benzopyrene). The sintering speed of this product is moderate, no moisture mud, high temperature erosion resistance, excellent erosion resistance, especially no yellow smoke in the iron tapping process, environmental protection and pollution-free, which is beneficial to the health and working environment of workers.
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Chem.comp |
Crushing strength Mpa |
bending strength Mpa |
Linder change Mpa
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Bulk density g/cm3
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Apparent porosity |
|
|
Al2O3 |
Sic+C |
1350℃×3h |
1350℃×3h |
1350℃×3h |
1350℃×3h |
Normal Temperature |
|
|
HXPN-HI |
≥40 |
≥25 |
≥9 |
≥7 |
±1.2 |
≥1.85 |
≥30 |
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|
This indicator is for reference only. For the use effect of the blast furnace, its smelting products and operation methods need to be studied, and the furnace conditions are adjusted |
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Environmental Specification
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（PPM） Benzopyrence |
（g） Alkali |
（g） Sulfur |
（g） Nitrogen |
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≤5 |
≤0.45 |
≤0.54 |
≤1.1+ |
Conventional Taphole Clay
Conventional taphole clay is a blast furnace specific taphole clay with high
resistance to slag iron erosion and erosion, excellent workability, and easy growth and
maintenance of mud bags. It has the characteristics of long tapping time, no splashing,
and smooth opening and blocking
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Test item
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Test condition
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Physicoch emical index
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Typical value
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Test standard
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Bulk density（g/cm3）
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1350℃×3h
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≥1.8
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1.83
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YB/T5200
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Cold compressive strength （MPa）
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1350℃×3h
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≥10
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16.2
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YB/T5201
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linear change rate （%）
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1350℃×3h
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±1.5
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+0.58
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YB/T5203
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Chemical composition （%） |
Al2O3
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≥15
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23.7
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GB/T16555
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SiC+Si3N4+C
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≥25
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30.4
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High strength and anti-oxidation performance
The vanadium-titanium-aluminum alloy taphole clay developed by Gongyi Yuying Refractory Co., Ltd. is carefully formulated with a variety of raw materials, including calcium titanate, chrome corundum, brown corundum, green silicon carbide, etc., as well as antioxidants such as metal titanium powder, metal vanadium powder and metal aluminum powder. These ingredients can form vanadium-titanium-aluminum alloy at high temperatures, greatly improving the strength and anti-oxidation properties of the taphole clay.
Anti-scouring performance
The taphole clay needs to have good anti-scouring performance under the scouring of high-temperature and high-pressure molten steel. The vanadium-titanium-aluminum alloy taphole clay effectively enhances the anti-scouring performance of the taphole clay through high-hardness intermetallic compounds such as vanadium carbide and titanium carbide formed by metal vanadium, metal titanium and carbon.
Good repair performance
In the middle and late stages of the service life of the blast furnace, problems such as bell mouth or bull horn grooves often appear around the taphole, affecting the efficiency and safety of tapping. The titanium oxide in the vanadium-titanium-aluminum alloy taphole clay is reduced by carbon at high temperature to form new phases such as TiC and TiN, which can be deposited on the side walls and hearth area of the blast furnace. Over time, the expanded iron outlet area can be repaired.
Seal the taphole
The main function of taphole clay is to seal the taphole and prevent high-temperature substances from leaking. In the formula of taphole clay, binders such as clay play the role of binders and lubricants, ensuring that the taphole clay has good plasticity and is easy to seal the taphole.
Maintaining the stability of the taphole
The high strength, anti-oxidation and anti-scouring properties of the taphole clay ensure the stability of the taphole. Under the scouring of high-temperature and high-pressure molten steel, the taphole clay can maintain structural stability and avoid deformation or damage to the taphole.
Repairing the taphole
The titanium oxide in the taphole clay reacts chemically with carbon at high temperature to generate a new phase with high hardness, which is deposited on the side wall and furnace area of the blast furnace, gradually repairing the taphole part of the expanded hole and improving the tapping efficiency.
Innovation of blast furnace taphole clay in improving furnace stability and production efficiency
Improving furnace stability
The high strength and anti-scouring properties of the taphole clay help to maintain the stability of the taphole, reduce furnace conditions such as taphole depth and tapping time fluctuations, thereby ensuring the stability of the blast furnace condition.
Increase production
The high strength of anhydrous taphole clay can maintain the stability of blast furnace conditions and provide a basis for increasing blast furnace production. At the same time, the repair performance of taphole clay helps to extend the service life of blast furnaces and further improve production efficiency.
Reduce costs
The high performance of taphole clay reduces the number of maintenance and downtime of blast furnaces and reduces ironmaking costs. At the same time, the repair performance of taphole clay extends the service life of blast furnaces and reduces the frequency and cost of replacing blast furnaces.
In short, blast furnace taphole clay, as an innovative product, plays an important role in improving furnace stability, increasing production and reducing costs. Looking forward to your contact us
Anhydrous tap hole mix for blast furnace tap hole
Refractory wet mud used to block the iron outlet can be divided into two categories: water cannon mud and waterless gun mud. On large and medium -sized blast furnaces on high top pressure and high degree of smelting.
Refractory ramming mass (refractory taphole mass) is a kind of Refractory used for lining of blast furnace tapping groove. It is mainly used to protect the blast furnace out of the ditch from high-temperature hot metal and slag erosion and erosion, and has excellent high-temperature resistance and wear resistance. The ramming material for the iron discharge ditch is usually composed of corundum, silicon carbide and carbonaceous material, which has the ability of resisting hot metal and molten slag erosion and scouring, reburning line change small, strong resistance to a variety of oxidation characteristics. The construction of the ramming material for the iron ditch is convenient, easy to dismantle and repair, does not produce harmful gas, and is beneficial to environmental protection.
Anhydrous taphole mud/taphole clay refers to taphole mud made of tar, resin, etc. as binders and corundum, bauxite, clay, silicon carbide, coke powder, etc. as raw materials. Anhydrous carbon taphole mud is made by a mud mill. When rolling, oil is added first, then block materials (clay and asphalt), and then powder materials (coke powder and clinker powder) are added after crushing. After pressing and mixing, the mud can be produced when it meets the standards.
Refractory wet mud used to block the iron outlet can be divided into two categories: water cannon mud and waterless gun mud. On large and medium -sized blast furnaces on high top pressure and high degree of smelting.
Insulating high alumina refractory bricks mainly refer to refractory products with an aluminum content of more than 48%. They are also called lightweight high-alumina bricks or heat-insulating high-alumina bricks due to their advantages of low bulk density, light weight, and good heat insulation effect. . It is a kind of thermal insulation refractory brick commonly used in high temperature industrial kilns and thermal equipment.
Anti stripping high alumina bricks are referred to as anti-stripping bricks or anti-stripping refractory bricks. Anti-stripping high-alumina bricks are widely used in my country's new dry process kiln, Libore kiln and wet process kiln, including kiln door cover, rising flue, cooling zone, decomposition zone, safety belt, transition zone, coolant rear Walls and side walls and beams with curved ceilings.
High alumina brick is one of the indispensable basic refractory materials in the upper and middle parts of blast furnace body in iron and steel industry
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