本文選題：赤泥 + 成孔劑　； 參考：《濟(jì)南大學(xué)》2015年碩士論文

【摘要】：赤泥堆存量逐漸增加,不僅占用了大量的土地資源,而且造成了嚴(yán)重的環(huán)境污染,赤泥的綜合利用已經(jīng)成為亟需解決的難題。本論文針對赤泥存在的理化性質(zhì)復(fù)雜、膠凝活性低等問題,在對赤泥基本特性進(jìn)行測試分析的基礎(chǔ)上,利用其分別制備了赤泥輕質(zhì)保溫磚和赤泥輕質(zhì)陶粒,探討其相關(guān)作用機(jī)理。利用X射線熒光光譜儀、X射線衍射分析儀、SEM、差熱分析儀對赤泥的化學(xué)組成、物相組成、微觀形貌及熱性能進(jìn)行了測試表征。結(jié)果表明,赤泥主要化學(xué)組成為Si O2、Fe2O3、Al2O3,主要物相組成為石英、方解石、赤鐵礦、鈣鋁榴石、鈣鐵榴石、鈣黃長石等晶體礦物,赤泥中主要礦物的物理化學(xué)性質(zhì)比較穩(wěn)定。研究了粉磨時間對赤泥粒度的影響,結(jié)果表明,隨著粉磨時間的增加,赤泥過140目方孔篩篩余量呈現(xiàn)先減小后增大的趨勢;粉磨時間為30min時,赤泥過140目方孔篩篩余量達(dá)到最小值。赤泥燒結(jié)磚原料配比試驗中,研究了主要原料配比、復(fù)合助熔劑配比及其摻量、成孔劑配比對赤泥輕質(zhì)保溫磚性能的影響,結(jié)果表明,赤泥燒結(jié)磚主要原料配比為赤泥:泥沙:膨潤土=5:4:1,復(fù)合助熔劑配比為硝酸鈉:硼砂:氟化鈣=1:3:2,復(fù)合助熔劑摻量為4%時,以150g原料中摻加250ml聚苯顆粒與100ml膨脹珍珠巖作為成孔劑制備的赤泥輕質(zhì)保溫磚試樣性能較好。研究了成型壓力對赤泥輕質(zhì)保溫磚性能的影響,結(jié)果表明,當(dāng)成型壓力為0.25MPa時,坯體內(nèi)部孔結(jié)構(gòu)無變形,混合料在成孔劑周圍形成的基體比較致密,制得的試樣抗壓強(qiáng)度較高,導(dǎo)熱系數(shù)較小。赤泥輕質(zhì)保溫磚的燒結(jié)制度試驗中,研究了燒結(jié)溫度、燒結(jié)保溫時間、升溫速率對試樣性能的影響,結(jié)果表明,本試驗條件下,當(dāng)燒結(jié)溫度為1110℃,燒結(jié)保溫時間為4h,升溫速率為3℃/min制得的試樣性能較好。赤泥輕質(zhì)陶粒制備試驗中,研究了主要原料配比、發(fā)泡劑摻量、助熔劑摻量、升溫速率分別對試樣性能的影響,結(jié)果表明,當(dāng)赤泥:粉煤灰:泥沙質(zhì)量比為35:39:26,發(fā)泡劑摻量為6%,助熔劑摻量為5%,升溫速率為20℃/min時,制得的試樣性能較好,其表觀密度為719kg/m3,堆積密度為513kg/m3,筒壓強(qiáng)度為3.3MPa,吸水率為14.9%,各項性能均滿足國標(biāo)GB/T17431.1-1998普通輕集料陶粒的標(biāo)準(zhǔn)要求。
[Abstract]:The amount of red mud heap is increasing gradually, which not only occupies a lot of land resources, but also causes serious environmental pollution. The comprehensive utilization of red mud has become a difficult problem that needs to be solved. Aiming at the problems of complex physical and chemical properties and low cementitious activity of red mud, the red mud light thermal insulation brick and red mud lightweight ceramsite were prepared on the basis of testing and analyzing the basic characteristics of red mud. The related mechanism was discussed. The chemical composition, phase composition, microstructure and thermal properties of red mud were characterized by X-ray diffraction analyzer (SEM) and differential calorimetry (DTA). The results show that the main chemical composition of red mud is Sio _ 2, Fe _ 2O _ 3 and Al _ 2O _ 3, and the main phases are quartz, calcite, hematite, calcite, calcium ferrite, calcium yellow feldspar and so on. The physical and chemical properties of the main minerals in red mud are relatively stable. The effect of grinding time on the particle size of red mud was studied. The results showed that with the increase of grinding time, the margin of red mud sieve over 140mesh square sieve decreased first and then increased, and when the grinding time was 30min, Red mud through 140 mesh square sieve margin reached the minimum value. In the experiment of raw material proportion of red mud sintered brick, the effects of main raw material ratio, compound flux ratio and its content, pore-forming agent ratio on the properties of red mud light heat preservation brick were studied. The main raw material ratio of red mud sintered brick is red mud: silt: bentonite 5: 4: 1, the ratio of compound flux is sodium nitrate: borax: calcium fluoride 1: 3: 2, and the amount of compound flux is 4. The red mud lightweight insulating brick with 150g raw material mixed with 250ml polystyrene particles and 100ml expanded perlite as pore-forming agent has better properties. The effect of forming pressure on the properties of red mud lightweight insulating brick is studied. The results show that when the forming pressure is 0.25 MPA, the inner pore structure of the billet has no deformation, the matrix formed by the mixture around the pore-forming agent is relatively dense, and the compressive strength of the sample is higher. The thermal conductivity is small. The effects of sintering temperature, sintering time and heating rate on the properties of red mud light insulating brick were studied. The results showed that the sintering temperature was 1110 鈩，

本文編號：2032282