本文選題：初渣　切入點(diǎn)：高鋁礦　出處：《遼寧科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近些年來(lái),各大鋼廠之間的競(jìng)爭(zhēng)越來(lái)越劇烈。為了經(jīng)濟(jì)利益的最大化,眾多鋼廠引進(jìn)了成本較低的高鋁礦,而眾所周知,Al_2O_3含量會(huì)直接對(duì)爐渣的流動(dòng)性、穩(wěn)定性、高爐透氣性以及渣鐵能否順利分離、生鐵的質(zhì)量造成重要影響。因此,在保證高爐生產(chǎn)順利進(jìn)行的條件下如何合理使用高鋁鐵礦石成為了眾多學(xué)者的研究熱點(diǎn)。國(guó)內(nèi)外對(duì)高鋁終渣的研究眾多,已基本趨近于完善,而對(duì)高鋁初渣的相關(guān)試驗(yàn)較少,試驗(yàn)數(shù)據(jù)有待補(bǔ)充。本文以高鋁燒結(jié)礦在高爐軟熔滴落過(guò)程中形成的高爐初渣為主要研究對(duì)象,在實(shí)驗(yàn)室條件下采用分析純?cè)噭┻M(jìn)行初渣的制備,分別探討了在CaO-SiO_2-MgO-Al_2O_3-FeO五元渣系中,FeO(5%-25%)、Al_2O_3(6%-15%)、R2對(duì)初渣粘度、熔化性溫度、活化能和穩(wěn)定性溫度的影響規(guī)律。實(shí)驗(yàn)結(jié)果表明:在堿度(CaO/SiO_2)為2.0時(shí),爐渣粘度隨FeO含量的增大而減小,且FeO含量越大,爐渣的熔化性溫度越低;熔化性溫度也顯示為相同的規(guī)律。固定(CaO/SiO_2)為2.0,FeO的質(zhì)量分?jǐn)?shù)分別為5%、15%、25%時(shí),改變Al_2O_3(6%-15%)含量,發(fā)現(xiàn)隨著Al_2O_3質(zhì)量分?jǐn)?shù)的增大,爐渣粘度呈現(xiàn)出降低的趨勢(shì)。當(dāng)FeO為10%,Al_2O_3為12%,堿度(CaO/SiO_2)為1.4-2.0時(shí),爐渣逐漸表現(xiàn)為短渣特性,隨爐渣堿度增大,粘度水平整體呈現(xiàn)增大趨勢(shì)。爐渣的穩(wěn)定性、活化能的變化與粘度的變化規(guī)律大致吻合,這與爐渣中的陰離子團(tuán)有關(guān)系。在探討CaO/MgO和Al_2O_3/SiO_2與初渣粘度的關(guān)系時(shí)發(fā)現(xiàn),爐溫為1583K時(shí)CaO/MgO與Al_2O_3/SiO_2分別為4.6和0.46左右時(shí)爐渣的粘度值最低。繪制爐渣的四元堿度與爐渣粘度關(guān)系曲線,得到二次曲線的關(guān)系,粘度最小值出現(xiàn)在四元堿度為1.4左右。通過(guò)傅里葉紅外光譜的檢測(cè)手段來(lái)分析爐渣內(nèi)部微觀結(jié)構(gòu),檢測(cè)結(jié)果與爐渣粘度的變化規(guī)律相吻合。
[Abstract]:In recent years, the competition among the major steel mills has become more and more intense. In order to maximize the economic benefits, many steel mills have introduced high-alumina mines with lower costs, and it is well known that the content of Al _ 2O _ 3 directly affects the fluidity and stability of the slag. The permeability of blast furnace and the smooth separation of slag and iron have important influence on the quality of pig iron. How to use high alumina iron ore reasonably under the condition of ensuring the smooth progress of blast furnace production has become a hot research topic for many scholars. There are many researches on high aluminum final slag at home and abroad, which have basically approached to perfection, but few related tests have been done on high aluminum primary slag. The experimental data need to be supplemented. In this paper, the primary slag of blast furnace formed in the course of soft dropping of high alumina sinter is taken as the main research object, and the analytical pure reagent is used to prepare the initial slag under laboratory conditions. The effects of R2 on initial slag viscosity, melting temperature, activation energy and stability temperature in CaO-SiO_2-MgO-Al_2O_3-FeO quaternary slag system are discussed. The results show that the slag viscosity decreases with the increase of FeO content and the content of FeO increases with the increase of FeO content when the alkalinity of Cao / Sio _ 2 is 2.0, and the effect of R2 on the initial slag viscosity, melting temperature, activation energy and stability temperature is discussed. The lower the melting temperature of the slag, the more the melting temperature shows the same rule. The fixed Cao / SiO2) is 2.0% Feo, the mass fraction of 20% Feo is 5%, and at 25%, change the content of Al2O3 / 6-15%), and it is found that with the increase of the mass fraction of Al_2O_3, The slag viscosity shows a decreasing trend. When the FeO is 10 / Al _ S _ 2O _ 3 = 12 and the basicity / Cao / Sio _ 2 is 1.4-2.0, the slag gradually exhibits a short slag characteristic. With the increase of slag alkalinity, the viscosity level increases as a whole. The change of activation energy is consistent with the change of viscosity, which is related to the anionic group in slag. It is found that the relationship between CaO/MgO and Al_2O_3/SiO_2 and the viscosity of primary slag is discussed. When the furnace temperature is 1 583 K, the slag viscosity values are the lowest when CaO/MgO and Al_2O_3/SiO_2 are 4. 6 and 0. 46, respectively. The relationship between the four component alkalinity of slag and the viscosity of slag is drawn, and the relation of quadratic curve is obtained. The minimum value of viscosity appears in the quaternary alkalinity of about 1.4. The microstructure of slag is analyzed by means of Fourier infrared spectroscopy, and the results are in agreement with the variation of slag viscosity.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TF521;X757

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