本文關(guān)鍵詞： 硅鈣渣 水泥熟料 易燒性 礦物相含量 微觀形貌　出處：《西安建筑科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著高鋁粉煤灰替代鋁土礦提取氧化鋁技術(shù)在工業(yè)實踐中的應用,產(chǎn)生了大量的高鋁粉煤灰提鋁后的副產(chǎn)物硅鈣渣,如果這些硅鈣渣不能及時處理,將對環(huán)境產(chǎn)生污染并造成資源的浪費。硅鈣渣含有約40%的氧化鈣和12%的二氧化硅,可以替代部分水泥生料來燒制水泥熟料。本研究設(shè)計合適的率值、煅燒溫度和硅鈣渣在水泥生料中的不同摻量,通過煅燒結(jié)果來說明硅鈣渣的摻量對燒成結(jié)果的影響;通過測試游離氧化鈣的值來探討硅鈣渣的摻量和煅燒溫度對水泥生料的易燒性的影響;通過用XRD分析和Rietveld全譜擬合方法對燒成熟料的礦物組成的定量分析,研究硅鈣渣的摻量和煅燒溫度對熟料礦物相含量的影響:通過巖相分析和SEM-EDS分析來探討硅鈣渣的摻量對熟料礦物相尺寸大小、分布狀態(tài)和礦物相的生長發(fā)育等微觀形貌的影響。研究結(jié)果表明:硅鈣渣(脫堿渣和原渣)分別摻入水泥生料中燒制熟料時,脫堿渣對易燒性的改善效果比原渣明顯。用硅鈣渣(脫堿渣和原渣)作水泥生料時,能降低熟料的燒成溫度,但要控制熟料的煅燒溫度,防止將水泥熟料燒融。摻入硅鈣渣燒制出的熟料的礦物相的組成主要為硅酸三鈣(C3S)、硅酸二鈣(C2S)、鋁酸鈣(C3A)和鐵鋁酸四鈣(C4AF)。隨著煅燒溫度的提高,硅酸三鈣的含量逐漸增加,當硅鈣渣(脫堿渣)摻量大于10%時,隨著硅鈣渣摻量的增加,硅酸三鈣的含量逐漸減小,硅酸二鈣和鋁酸三鈣的含量逐漸增加;當硅鈣渣摻量小于10%時,隨著硅鈣渣摻量的增加,硅酸三鈣的含量逐漸增加。煅燒溫度為1350℃,硅鈣渣的摻量分別為0%、30%、60%時,燒制出的熟料中C3S礦物相呈板狀、柱狀,呈散亂狀態(tài)分布,C2S礦物相呈橢圓狀且伴有交叉雙晶紋,以礦巢狀集中的分布;隨著硅鈣渣摻量的增加,C3S礦物相的Ca/Si摩爾比先增加后大幅度降低,這說明了60%的硅鈣渣的摻量對熟料中C3S的形成和晶體的發(fā)育長大是不利的。
[Abstract]:With the application of high alumina fly ash instead of bauxite extraction technology in industrial practice, a large number of by-products of silica calcium slag after aluminum extraction from high aluminum fly ash have been produced, if these silica calcium slag cannot be treated in time, Silica slag contains about 40% calcium oxide and 12% silicon dioxide, which can replace some raw cement to burn cement clinker. The calcination temperature and the content of calcium silicate slag in cement raw meal are different. The effect of the content of calcium silicate slag on the sintering result is explained by the calcination results. The influence of the content of calcium silicate slag and calcination temperature on the burnability of cement raw meal was studied by testing the value of free calcium oxide, and the mineral composition of the clinker was quantitatively analyzed by XRD analysis and Rietveld full-spectrum fitting method. The effect of the content of calcium silicate slag and calcination temperature on the mineral phase content of clinker was studied. The size of clinker mineral phase was studied by lithofacies analysis and SEM-EDS analysis. The results show that calcium silicate slag (desalinated slag and raw slag) are mixed into cement raw meal to make clinker respectively. When calcium silicate slag (desalination slag and raw slag) is used as cement raw material, the sintering temperature of clinker can be reduced, but the calcination temperature of clinker should be controlled. The mineral phase of the clinker is mainly composed of tricalcium silicate, dicalcium silicate, calcium aluminate, calcium aluminate, and tetracalcium ferrate C4AF.As the calcination temperature increases, the content of tricalcium silicate increases gradually. When the content of calcium silicate slag is more than 10, the content of tricalcium silicate decreases gradually, and the content of dicalcium silicate and tricalcium aluminate increases with the increase of the content of calcium silicate slag, and when the content of calcium silicate slag is less than 10, the content of tricalcium silicate decreases gradually, and the content of calcium silicate slag increases gradually when the content of calcium silicate slag is less than 10. With the increase of the content of calcium silicate slag, the content of tricalcium silicate increases gradually. The calcination temperature is 1350 鈩，

本文編號：1522325