RH炉下部槽用无铬不烧砖的研究

发布时间：2018-07-27 18:56

【摘要】：近年来,无铬耐火材料的研发是耐火材料行业的发展趋势。为了实现RH炉的无铬化,以97电熔镁砂、镁铝尖晶石为原料制备出了方镁石-尖晶石不烧砖。在实验过程中,首先确定镁铝尖晶石的粒度和加入量,再确定结合剂的类型和加入量,最后探讨了添加剂对方镁石-尖晶石不烧砖性能的影响。实验结果表明:(1)镁铝尖晶石以0-1mm粒度加入时,方镁石-尖晶石砖具有较好的热震稳定性。当镁铝尖晶石加入量为15%时,方镁石-尖晶石砖具有较高的体积密度、常温耐压强度和较低的气孔率。(2)炉渣侵蚀方镁石-尖晶石砖的方式有化学反应和渗透侵蚀两种。炉渣的侵蚀导致方镁石-尖晶石砖结构的疏松,而低熔点物质C4AF使镁铝尖晶石不断的溶解,破坏方镁石-尖晶石砖的强度和热震稳定性。(3)以酚醛树脂为结合剂的方镁石-尖晶石砖和以六偏磷酸钠为结合剂的方镁石-尖晶石砖相比,具有较好的体积密度、常温抗折强度、常温耐压强度和较低的气孔率。而以六偏磷酸钠作结合剂的镁尖晶石砖的热震稳定性比以酚醛树脂作结合剂的镁尖晶石砖的好。(4)以酚醛树脂和六偏磷酸钠为复合结合剂的试样,其体积密度、常温抗折强度和耐压强度随着树脂比例的增大而增大。酚醛树脂:六偏磷酸钠=3:1时,试样的热震稳定性最好。综合试样的各种性能,加入4%的复合结合剂(六偏磷酸钠:酚醛树脂=2:2)时,方镁石-尖晶石砖的综合性能较好。(5)添加氧化铁的方镁石-尖晶石砖抵抗炉渣侵蚀的能力较差;添加氧化钛和氧化锆可阻止炉渣的渗透;以氧化铜为添加剂的方镁石-尖晶石砖抵抗炉渣侵蚀的能力差。当氧化钛的加入量为3%时,方镁石-尖晶石砖的抗渣性最好。
[Abstract]:In recent years, the R & D of Cr-free refractory is the development trend of refractory industry. In order to realize chromium-free in RH furnace, periclase-spinel unfired brick was prepared from 97 fused magnesia and magnesia-aluminum spinel. In the process of experiment, the granularity and addition amount of magnesia-alumina spinel, the type and amount of binder were determined, and the effect of additives on the properties of periclase spinel unfired brick was discussed. The experimental results show that: (1) when magnesia-alumina spinel is added with 0-1mm particle size, the periclase spinel brick has good thermal shock stability. When the content of magnesia-alumina spinel is 15, the periclase spinel brick has higher volume density, higher pressure strength at room temperature and lower porosity. (2) there are chemical reaction and permeation erosion in slag erosion of periclase spinel brick. The erosion of slag leads to the loose structure of periclase spinel brick, while the low melting point material C4AF causes the continuous dissolution of magnesia-aluminum spinel. The strength and thermal shock stability of periclase spinel brick are destroyed. (3) the volume density of periclase spinel brick with phenolic resin as binder is better than that with periclase spinel brick with sodium hexametaphosphate as binder. Flexural strength at room temperature, compressive strength at room temperature and low porosity. The thermal shock stability of magnesium spinel brick with sodium hexametaphosphate as binder is better than that of magnesium spinel brick with phenolic resin as binder. (4) the bulk density of the sample with phenolic resin and sodium hexametaphosphate as composite binder is better than that of magnesium spinel brick with phenolic resin as binder. The flexural strength and compressive strength at room temperature increase with the increase of resin ratio. Phenolic resin: sodium hexametaphosphate has the best thermal shock stability when sodium hexametaphosphate is 3: 1. When the composite binder (sodium hexametaphosphate: phenolic resin 2: 2: 2) was added to the samples, the comprehensive properties of periclase spinel brick were better. (5) the periclase spinel brick with ferric oxide had poor resistance to slag erosion; The addition of titanium oxide and zirconia can prevent the slag from permeating, and the periclase spinel brick with copper oxide as additive has poor resistance to slag erosion. The slag resistance of periclase-spinel brick is the best when the content of titanium oxide is 3.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ175.713

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