(1. 北京科技大學(xué) 冶金與生態(tài)工程學(xué)院，北京 100083； 2. 北京科技大學(xué) 鋼鐵協(xié)同創(chuàng)新中心，北京 100083； 3. 北京科技大學(xué) 鋼鐵冶金新技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100083； 4. 贊比亞謙比希銅冶煉有限公司，基特韋 23558)
摘 要: 采用旋轉(zhuǎn)柱體法研究在1175~1400 ℃溫度區(qū)間內(nèi)，K2O含量對(duì)CaO-Al2O3-MgO-FexO-SiO2系熔體黏度的影響，并結(jié)合XRD和SEM分析了熔渣冷卻過(guò)程中各物相的析出行為。同時(shí)，采用FactSage軟件計(jì)算了該體系析出相總量及析出溫度，與實(shí)驗(yàn)結(jié)果進(jìn)行對(duì)比和分析。結(jié)果表明：當(dāng)熔渣中K2O含量低于1%(質(zhì)量分?jǐn)?shù))時(shí)，由于堿性氧化物的網(wǎng)絡(luò)破壞作用，熔渣黏度降低，但是隨著K2O含量的繼續(xù)增加，熔渣黏度呈現(xiàn)先升高后降低的趨勢(shì)，黏度最大值出現(xiàn)在n(K2O)/n(Al2O3)＞1的區(qū)域。同時(shí)，熔渣的黏度隨溫度的下降而升高，且黏度隨溫度變化時(shí)會(huì)出現(xiàn)驟增的轉(zhuǎn)折點(diǎn)，當(dāng)?shù)竭_(dá)“轉(zhuǎn)折點(diǎn)”溫度時(shí)，熔渣的黏度會(huì)迅速升高，這主要是由橄欖石相的析出造成。
關(guān)鍵字: K2O含量；黏度；FactSage軟件；析出相
（1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China. 4. Chambishi Copper Smelter Limited, ZhangKitwe 23558, Zambia）
Abstract:The viscosities of CaO-Al2O3-MgO-FexO-SiO2 slags with different K2O contents were measured using the rotating cylinder method in the temperature range from 1175 ℃ to 1400 ℃. The quenched slag samples were also characterized by XRD and SEM to identify the precipitated phases during the cooling process. Meanwhile, the theoretical calculation on precipitated phases was carried out on the platform of Factsage with the Equilibrium Moduls. The results show that the viscosity decreased when K2O is less than 1% (mass fraction). With increasing K2O content, viscosity increases firstly and then decreases. The maximum value of viscosity occurs when the mole ratio of K2O and Al2O3 is larger than 1. During cooling, the viscosity increases, and at the critical temperature, the viscosity enlarges suddenly, which is caused by the precipitation of the fayalite.
Key words: K2O content; viscosity; FactSage software; precipitated phase
