Taphole Clay Composition Factors -- design according to Blast Furnace

To keep the tap hole under steady operation, taphole clay should have volume stability and good workability, easy sintering and open-up, good molten iron and slag resistance, good thermal shock resistance.Anhydrous taphole caly is very polular due to its better performance.

Here are the composition factors of taphole clay:

Binding Agent

Tar and modified resin are the main binding agent for anhydrous taphole clay,which also add plasticity to taphole clay.During sintering, taphole clay is carbon-boned thanks to carbonization of tar and modified resin.This improve the strength of taphole clay and assure the tapping time.

Bitumen

Melting of bitumen can fill up the joint of taphole clay when operation.Thus increase the adhension of taphole clay. Meanwhile, carbonization of bitumen will also increase high temperature performance of taphole clay. Appropriate additon of bitumen can increase the strength of taphole clay significantly.While over addition will cause coking and reduce the strength of taphole clay.

Coke

Coke as part of  aggregate of taphole clay can prevent it from over sintering and improve the resistance to hot metal and slag. Too many coke will increase the apparent porosity and low down the strength. On the contrary, taphole clay has bad air permeability, which will induce humid taphole clay.

Above all, to have a good product and achieve good performance, we must learn the real blast furnace operation very well and product should be designed according to the real requirements.

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Tap hole clay for blast furnace operation

The performance of taphole clay( taphole mud or taphole gun mass) always affect operation of blast furnace a lot.

Damage for taphole clay

1. mechannical force and thermal shock

When drilling to open the tap hole, hot metal and slag run out from taphole channel, and expose taphole clay under 1500℃. During the plugging operation, the temperature will drop to 200℃ repidly. Under such repeat, thermal stree is generated in the old tap hole clay package, which will cause crack in the tap hole. In addition, during the sitering process of new tap hole clay, it is easy to incur some joints between the contact surface and lead the hot metal into the joints. When next time to open the tap hole, it is easier for hot metal flow to erode the taphole clay package.

2.Chemical Erosion

When taphole clay contacted with melton iron or slag, it is evry easy to induce some chemical reactions. In this way, taphole clay also be eroded. And the taphole channel will be expanded, hot metal flow will rush out from taphole and bring tap hole with instability.

3.Tapping Times

Appropiate less tapping times is good for tap hole maintenance. The taphole clay package can be sentirely intered  and form a strong package. So that, humid tap hole and shallow tap hole less happens.

4.Tapping Method

Anhydrous taphole clay has good strength. We use alloy drill bit to open tap hole and sometimes with oxygen for lancing of tap hole. Unsteady taphole diameter and oxidization  to taphole clay will reduce the stability of tap hole.

Therefore, we require taphole clay with following features:

... Easy and reliable plugging and opening of the taphole

... Long stable taphole length and long tapping time, good slag resistance and pig iron resistance

... Quick and reliable hardening of the taphole clay

... Minimize taphole spraying while operating

... User-friendly by providing easier clean-out of the mud gun nozzle

... Low emission 

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Sheng Iron Refractories Co.,Ltd. is a ISO9001:2008 certified producer of monolithic refractory products and metallurgy auxiliary materials. Our main products include tap hole clay(tap hole mud, tap hole gun mass), castable for iron runner (iron trough), refractory motar, work lining for tundish, precast for tundish and some refractory raw materials.

Nearly 10 years, ShengIron provide quality products and construction services for our clients within the iron, steel and non-ferrous industries. With our strong and independent technical team, ShengIron Refractories has the appropriate knowledge in order to develop and further optimize the most advanced and reliable solution for our customers.

Our plant is located in Luoyang city, with rich mineral resources for refractory,here is also known as a refractory capital, with world class research institute for refractories. Our annual capacity for monolithic refractory materials is 50 thousand metric tons, and 10 thousand metric tons for precast refractory, 80 thousand metric tons for metallurgy auxiliary materials respectively. We adopt scientific production process and take strictly measures according to ISO9001 quality management system to control the quality. Thus, we can provide our clients with steady and superior products and services.

In addition, our professional technical team offers technical consultant and on-site supports, which is easier for our clients to choose a right product and get better performance.

We persevere in the principles" take qality as root and honest operation“. Responsible for the community, we endeavor ourselves to develop refractory tehnologies and creat good social benefits.