發(fā)布時間：2018-07-27 18:56

【摘要】：近年來,無鉻耐火材料的研發(fā)是耐火材料行業(yè)的發(fā)展趨勢。為了實現(xiàn)RH爐的無鉻化,以97電熔鎂砂、鎂鋁尖晶石為原料制備出了方鎂石-尖晶石不燒磚。在實驗過程中,首先確定鎂鋁尖晶石的粒度和加入量,再確定結(jié)合劑的類型和加入量,最后探討了添加劑對方鎂石-尖晶石不燒磚性能的影響。實驗結(jié)果表明:(1)鎂鋁尖晶石以0-1mm粒度加入時,方鎂石-尖晶石磚具有較好的熱震穩(wěn)定性。當(dāng)鎂鋁尖晶石加入量為15%時,方鎂石-尖晶石磚具有較高的體積密度、常溫耐壓強度和較低的氣孔率。(2)爐渣侵蝕方鎂石-尖晶石磚的方式有化學(xué)反應(yīng)和滲透侵蝕兩種。爐渣的侵蝕導(dǎo)致方鎂石-尖晶石磚結(jié)構(gòu)的疏松,而低熔點物質(zhì)C4AF使鎂鋁尖晶石不斷的溶解,破壞方鎂石-尖晶石磚的強度和熱震穩(wěn)定性。(3)以酚醛樹脂為結(jié)合劑的方鎂石-尖晶石磚和以六偏磷酸鈉為結(jié)合劑的方鎂石-尖晶石磚相比,具有較好的體積密度、常溫抗折強度、常溫耐壓強度和較低的氣孔率。而以六偏磷酸鈉作結(jié)合劑的鎂尖晶石磚的熱震穩(wěn)定性比以酚醛樹脂作結(jié)合劑的鎂尖晶石磚的好。(4)以酚醛樹脂和六偏磷酸鈉為復(fù)合結(jié)合劑的試樣,其體積密度、常溫抗折強度和耐壓強度隨著樹脂比例的增大而增大。酚醛樹脂:六偏磷酸鈉=3:1時,試樣的熱震穩(wěn)定性最好。綜合試樣的各種性能,加入4%的復(fù)合結(jié)合劑(六偏磷酸鈉:酚醛樹脂=2:2)時,方鎂石-尖晶石磚的綜合性能較好。(5)添加氧化鐵的方鎂石-尖晶石磚抵抗?fàn)t渣侵蝕的能力較差;添加氧化鈦和氧化鋯可阻止?fàn)t渣的滲透;以氧化銅為添加劑的方鎂石-尖晶石磚抵抗?fàn)t渣侵蝕的能力差。當(dāng)氧化鈦的加入量為3%時,方鎂石-尖晶石磚的抗渣性最好。
[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.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ175.713

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