Refratários de magnésia-carbono para siderurgia: evolução dos métodos de aumento de suas propriedades

Abstract

Due to its unique set of properties and resources, MgO-C refractories have been fundamental for the steel industry to reach its current levels of productivity. Thus, it is extremely important to prepare material that indicates as development opportunities not yet explored, as well as research lines that have been successful in increasing the efficiency and useful life of MgO-C refractories. (I) use of additives to induce graphitization of carbon in phenolic resins, (ii) induction of in situ growth of special combination whiskers for the consumption of electric energy and wear and thermal shock damage of refractory: (i) use of Additives to induce carbon graphitization in phenolic resins, antioxidant additives, (iii) incorporation of nano materials into their compositions, such as carbon sources and antioxidant additives. The use of nanocarbon enables the considerable reduction of the carbon content without refractory without loss of property, attenuating as disadvantages that the carbon can cause to the refractory. While a reduced graphitization as disadvantages that are thermosets in front of other organic binders, the mustaches are capable of gaining significant gains in mechanical and chemical resistance. All methods are still under development, so its purpose is no industrial sector is still not possible, but it seems, and valuable resources in increasing the wear resistance and thermal shock damage of the refractories of MgO- C not Future. In addition, studies indicate that they can also reduce costs related to maintenance, steel quality and interruptions in the production process, however, their cost of purchase may raise the price of refractory.