在本研究中,使用脫硫石膏為原料。首先將脫硫石膏樣品磨成粉末,然后過80目的篩子,得到脫硫石膏粉末樣品。對脫硫石膏樣品的基本物理化學屬性進行分析,樣品中主要的物相為二水石膏,化學成分主要為氧化鈣、氧化硫,另外還含有少量的氧化鎂、氧化鐵和氧化鋁等。論文進行了以脫硫石膏為原料制備石膏砌塊的研究。首先將脫硫石膏粉在150℃,170℃,190°和200℃溫度下焙燒1h,1.5h,2.5和3h。通過XRD和SEM表征發(fā)現(xiàn),當焙燒溫度為170℃時,所得樣品的物相為半水石膏;采用標準稠度水試驗法測定了摻加了脫硫石膏的切塊的含水量,最佳的時間為2-3分鐘,終凝時間為45-50分鐘。采用最佳工藝條件制備了 1kg的半水脫硫石膏粉。通過鉆孔機將500g的樣品與70g的水混合攪拌20秒至25秒,并在鋼模中放置5-15分鐘。為了方便脫模,在模具側(cè)面添加少量油。將所制備的脫硫石膏砌塊分別在3種干燥條件下干燥。如:自然(陽光)干燥、室溫下干燥、烘箱中干燥。在自然和室溫干燥過程中,石膏砌塊被保存了3周,而對于烘箱中的干燥,這些塊在烘箱中保存了 24小時。最后對所得到的石膏砌塊進行抗壓和抗折測試,結(jié)果表明自然條件下干燥...

【文章頁數(shù)】：56 頁

【學位級別】：碩士

【文章目錄】：
ABSTRACT
摘要
1 Introduction
    1.1 Research Background
        1.1.1 Two Types of Gypsum:Natural and FGD
        1.1.2 Physical Properties
        1.1.3 FGD Gypsum Applications
            1.1.3.1 Wallboard
            1.1.3.2 Sheathing
            1.1.3.3 Soffit board
            1.1.3.4 Water resistant gypsum
            1.1.3.5 Wood chip boards
            1.1.3.6 Mining applications
            1.1.3.7 Synthetic soil component
            1.1.3.8 Glass making
            1.1.3.9 Plaster
        1.1.4 Uses of Gypsum
        1.1.5 Importance of topic
        1.1.6 Aim
        1.1.7 Objectives
2 Literature Review
3 Materials and Methods
    3.1 Oven
    3.2 Shaker
    3.3 Grinding Machine
    3.4 Application of different temperatures on the Gypsum samples
    3.5 Particle Size
    3.6 Crystal Phase
    3.7 Scanning Electronic Microscope (SEM) Analysis
    3.8 Standard Consistency Water Test of FGD Gypsum
4 Results & Discussion
    4.1 FGD Gypsum
        4.1.1 Particle size
        4.1.2 Crystal phase
        4.1.3 Chemical component
    4.2 Heating treatment
        4.2.1 Crystal Phase
        4.2.2 Microscopic Morphology
        4.2.3 Standard Consistency Water Test of FGD Gypsum
    4.3 Preparation of Block
        4.3.1 Sample Weight
        4.3.2 Block
        4.3.3 Mould Size
    4.4 Compressive Strength
    4.5 Breaking Strength
    4.6 Discussion
Conclusion
References



本文編號：3817558