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Influence of the atmosphere on the mechanical properties and slag resistance of magnesia-chrome bricks

机译：大气对镁铬砖力学性能和矿渣的影响

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摘要

Magnesia-chrome bricks are commonly used as the lining of smelters in copper and lead industry because of their resistance against the thermal, mechanical and chemical loads in the pyrometallurgical production process. In fact, the pyrometallurgical production process of lead-copper matte is generally a reducing process with plenty of coke and iron fillings as reducing agent, which implies that the magnesia-chrome bricks service in stronger reducing atmosphere. In this work, the microstructure, mechanical properties and slag resistance of such materials were investigated in reducing atmosphere to simulate the influence of the atmosphere on the properties of magnesia-chrome refractories. The results show that obvious increase in porosity and decrease in strength occurred to the magnesia-chrome samples after treating in reducing atmosphere. This is related to the structural damage of samples, in which Fe3+/Fe2+ within spinel (Mg, Fe)(Cr, Al, Fe)(2)O-4 were partly reduced to metallic Fe under reducing atmosphere. Consequently, the slag penetrated much easily into the matrix of the samples. Moreover, the slag corrosion also aggravated due to the aggressive FeO in slag and the formation of magnesiowustite in the penetration layer. Nevertheless, the high melt phases of spinel and forsterite were formed when the slag corrosion test was conducted in air atmosphere, thereby preventing further slag corrosion and penetration.
机译：由于它们在高温冶金生产工艺中的热，机械和化学载荷对热，机械和化学载荷的抵抗，镁铬砖通常用作铜和铅行业冶炼厂的衬里。事实上，铅铜磨砂的高温冶金生产过程通常是用大量焦炭和铁填充剂作为还原剂的降低过程，这意味着镁质 - 铬砖在更强大的减少气氛中的服务。在这项工作中，研究了这些材料的微观结构，机械性能和熔化性，在减少气氛中，以模拟大气对氧化镁铬耐火材料性能的影响。结果表明，在减少气氛中，镁铬样品孔隙率明显增加和强度的降低。这与样品的结构损伤有关，其中尖晶石（Mg，Fe）（Cr，Al，Fe）（2）O-4的Fe3 + / Fe2 +部分地将其部分还原成降低气氛。因此，炉渣容易进入样品的基质。此外，由于炉渣中的侵蚀性和渗透层中的镁瓦斯塔钛矿，炉渣腐蚀也会加剧。然而，当在空气气氛中进行炉渣腐蚀试验时，形成尖晶石和鳍状硅晶的高熔体相，从而防止进一步的熔渣腐蚀和渗透。

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