Environment-friendly anhydrous stemming for multi-taphole blast furnace, and preparation method thereof

Abstract

The invention belongs to the technical field of refractory materials for blast furnaces, and discloses environment-friendly anhydrous stemming for a multi-taphole blast furnace, and a preparation method thereof. The stemming consists of, by mass, 38-45% of aggregate, 40-47% of powder and 10-16% of a composite binding agent, wherein the composite binding agent is formed by mixing Carbores T60, Carbores T10, environment-friendly anthracene oil, Carbores P and a wetting agent, the benzo a pyrene content of the composite binding agent is smaller than 150 mg / kg, and the moisture content of the composite binding agent is smaller than or equal to 1.0%. The raw materials comprise a plurality of regenerated refractory materials and carbon-containing raw materials, so the production cost can be reduced, meanwhile, the prepared stemming product is convenient to operate during use, moderate in drying speed, good in peristalsis and filling performance, easy to pug, easy to open, stable in taphole depth, resistant to scouring and stable in slag resistance, the consumption of per ton of iron stemming is smaller than 0.5 kg in practical application, the benzopyrene content is smaller than 25 mg / kg, the environment of a blast furnace production area can be better improved, and the body health of operators is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of refractory materials for blast furnaces, and in particular relates to an environment-friendly anhydrous taphole clay for multi-tap blast furnaces and a preparation method thereof. Background technique [0002] Blast furnace ironmaking is the most mainstream smelting method in the world today. From the perspective of the entire steel production process, the ironmaking process accounts for about 50% of the cost and about 70% of the energy consumption. With the continuous improvement of the level of smelting technology and equipment and the requirements for the comprehensive energy consumption of blast furnaces, large-scale blast furnaces with stable high production, low consumption, long life, energy saving and environmental protection have become an inevitable trend in the development of ironmaking. Currently in operation or under construction in mainland China 4000m 3 There are more than 23 blast furnace...

AI Technical Summary

Problems solved by technology

[0003] However, looking at the existing anhydrous blast furnace clay for multi-tap furnaces, it is mainly made of alumina and brown corundum as aggregates, supplemented by plastic matrix materials or binders, which often have unreasonable formula matching and poor refractory performance. Poor strength, low strength, poor slag erosion resistance, large amount of mud consumption, difficult maintenance of iron holes and other problems; in addition, the binder generally uses traditional coal tar, anthracene oil or coal tar pitch, because the benzoa in these coal series products The content of pyrene ranges from 5000mg / kg to 12000mg / kg, so the pollution is relatively large during the production and use of gun clay, and a large amount of toxic yellow smoke often occurs. The environment makes the working conditions worse, and it is difficult to meet the development needs of energy conservation and environmental protection under the new situation. Moreover, benzo-a-pyrene is one of the carcinogens recognized in the world, and it will seriously threaten the health of workers.

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