本文關(guān)鍵詞： 鐵尾礦 加氣混凝土 蒸壓養(yǎng)護(hù) 動(dòng)力學(xué)過程 托貝莫來石　出處：《武漢理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：鐵尾礦是工業(yè)廢棄物的主要類型,目前多堆存在尾礦庫中,對礦山周邊環(huán)境造成很大的影響。隨著礦產(chǎn)資源的貧化和尾礦堆存量的增多,針對尾礦的綜合利用研究逐漸成為熱門課題。加氣混凝土是一種新型建筑材料,擁有質(zhì)輕、防火、保溫、抗震等諸多優(yōu)點(diǎn),應(yīng)用在建筑中能夠有效節(jié)能,提高能源利用率。利用尾礦制備加氣混凝土作為處理選礦尾礦的有效方法之一,不僅能夠大量消納堆存的尾礦,緩解礦山尾礦庫建設(shè)和維護(hù)的壓力,同時(shí)能為建材市場提供優(yōu)質(zhì)的產(chǎn)品,也為加氣混凝土生產(chǎn)原料開辟新的途徑。利用河北平泉富有公司低貧釩鈦鐵尾礦為主要硅質(zhì)原料,摻入適量的硅砂、石灰、水泥等添加物后制備加氣混凝土。系統(tǒng)研究了該鐵尾礦制備加氣混凝土工藝過程中的物料配比和蒸壓養(yǎng)護(hù)制度等,探討了蒸壓養(yǎng)護(hù)反應(yīng)動(dòng)力學(xué)過程,并對制備過程中的反應(yīng)機(jī)理進(jìn)行了闡述。河北平泉釩鈦鐵尾礦粒度較粗,-0.074 mm粒級(jí)僅占21.07%,SiO2含量為40.46%。試驗(yàn)研究結(jié)果顯示,加氣混凝土制備的最佳物料配比為尾礦:硅砂:石灰:水泥:石膏=32:35:21:10:2,鋁粉摻量為0.08%,水料比為0.57。蒸壓養(yǎng)護(hù)過程升溫時(shí)間為2 h,恒溫時(shí)間為8 h,恒溫溫度為178℃,并采用自然降溫方式。加氣混凝土制品的抗壓強(qiáng)度和絕干容重的平均值分別為3.98 MPa和622.1 kg/m3,已經(jīng)達(dá)到國家標(biāo)準(zhǔn)對A3.5B06規(guī)格加氣混凝土的要求。針對蒸壓養(yǎng)護(hù)反應(yīng)過程動(dòng)力學(xué)研究的結(jié)果顯示,蒸壓養(yǎng)護(hù)恒溫階段的原料反應(yīng)速度主要受反應(yīng)物在水化產(chǎn)物層中的擴(kuò)散速度所控制,加氣混凝土制備原料中的SiO2-Ca(OH)2-H2O體系的反應(yīng)過程可以用反應(yīng)物通過產(chǎn)物層的擴(kuò)散模型來描述,其動(dòng)力學(xué)方程式為2/31?2/3x?(1?x)?0.792 exp(?19269/RT)t?b。蒸壓養(yǎng)護(hù)過程中硅質(zhì)材料和鈣質(zhì)材料在高溫高壓環(huán)境中發(fā)生了一系列水熱合成反應(yīng),水化反應(yīng)產(chǎn)物類型逐漸從高堿度轉(zhuǎn)變?yōu)榈蛪A度,同時(shí)結(jié)晶度不斷完善,結(jié)構(gòu)也逐漸變得更為致密,最終制品中的主要化學(xué)成分為托貝莫來石、CSH、水化石榴石以及未反應(yīng)完全的SiO2,片狀的托貝莫來石和CSH凝膠相互膠結(jié)形成整體強(qiáng)度。
[Abstract]:Iron tailings are the main types of industrial waste. At present, there are many piles in tailings reservoir, which have a great impact on the surrounding environment of mines. With the depletion of mineral resources and the increase of tailings heap stock, The study of comprehensive utilization of tailings has gradually become a hot topic. Aerated concrete is a new type of building material, which has many advantages such as light weight, fire resistance, heat preservation, earthquake resistance, etc., which can be used in building to save energy effectively. Using tailings to prepare aerated concrete is one of the effective methods to deal with tailings, which can not only absorb large amounts of tailings, but also relieve the pressure of construction and maintenance of mine tailings. At the same time, it can provide high quality products for the building materials market, and also open up a new way for the production of aerated concrete raw materials. Using the low and poor vanadium titanium-iron tailings of Pingquan Rich Company in Hebei Province as the main siliceous raw materials, with appropriate amount of silica sand and lime, Aerated concrete was prepared after adding cement and other additives. The material ratio and autoclaved curing system in the process of preparing aerated concrete by iron tailings were studied systematically, and the kinetic process of autoclaved curing reaction was discussed. The reaction mechanism in the process of preparation was described. The particle size of Hebei Pingquan vanadium ferric titanium tailings is coarse and -0.074 mm. The content of Sio _ 2 is 40.46. The experimental results show that the content of Sio _ 2 is 40.46 mm, and the content of Sio _ 2 is 40.46 mm. The optimum material ratio of aerated concrete is tailings: silica sand: lime: cement: gypsum 32: 35: 21: 10: 2, aluminum powder 0.08, water / material ratio 0.57.The temperature rise time of autoclaved curing process is 2 hours, the constant temperature time is 8 hours, and the constant temperature temperature is 178 鈩，

本文編號(hào)：1503824