本文選題：鈦石膏 + 天然石膏��； 參考：《濟南大學》2015年碩士論文

【摘要】：鈦石膏作為一種替代天然石膏的石膏資源,是一項寶貴財富,雖然在水泥緩凝劑及輕質(zhì)墻體材料中得到了一定應(yīng)用,但是由于其水化活性比較差,強度難以被激發(fā)而被當作垃圾處理,成為應(yīng)用程度最小、應(yīng)用范圍最窄的工業(yè)副產(chǎn)石膏。本課題基于形態(tài)組成模擬法,探索導致鈦石膏標稠用水量大、力學強度低的原因,并在此基礎(chǔ)上,采用物理、化學兩種改性方法激發(fā)鈦石膏活性,改善鈦石膏物理性能,將其應(yīng)用于建材領(lǐng)域,為進一步促成鈦石膏的資源化應(yīng)用開拓新途徑。采用粒度分析儀、X射線熒光光譜儀等儀器研究了天然石膏與鈦石膏的物理形態(tài)與化學組成的區(qū)別。測試結(jié)果表明,鈦石膏的粒徑分布范圍相對天然石膏要窄,平均粒徑比天然石膏小;鈦石膏中Fe、Al、Si等雜質(zhì)元素含量均高于其在天然石膏中含量,尤其是鈦石膏中Fe元素含量比天然石膏要大得多;鈦石膏與天然石膏的物理性能差別較大,其中鈦石膏的標稠用水量是天然石膏的2.57倍,凝結(jié)時間明顯偏長,2h力學強度極小,根本無法達到GB/T 9776-2008《建筑石膏》的標準要求。通過控制粉磨所用時間,得到粉磨石膏系列,經(jīng)粒度分析發(fā)現(xiàn),粉磨時間為40min的試樣比表面積、平均粒徑以及顆粒級配情況和鈦石膏基本一致,達到形態(tài)模擬鈦石膏(以下簡稱MTG)的狀態(tài);MTG的標稠用水量相對于天然石膏略有增加,但其僅為鈦石膏標稠用水量的3/5;同時,MTG的初、終凝時間相對于天然石膏分別延長了6min、8min,但比鈦石膏的初、終凝時間分別短了14min、24min;MTG的2h抗折抗壓強度相對于天然石膏分別降低了31.27%以及13.87%,但是仍與鈦石膏存在明顯差距,其2h抗折抗壓強度分別比鈦石膏高198.15%、134.78%。這表明石膏物理形態(tài)對石膏水化硬化體的物理性能存在一定影響,但其并非導致鈦石膏性能差的決定性因素。在MTG的基礎(chǔ)上,依次遞加2.69%二氧化硅、1.23%氧化鋁、13.01%氧化鐵以及17.39%氫氧化鐵得到化學組成模擬鈦石膏(以下簡稱CTG)。試驗結(jié)果表明,依次摻加二氧化硅、氧化鋁、氧化鐵并未引起試樣物理性能明顯變化,而氫氧化鐵摻加到MTG中,試樣的物理性能發(fā)生顯著變化。單摻氫氧化鐵時,MTG的物理性能亦發(fā)生了顯著變化。氫氧化鐵摻量為17.5%時,試樣的標稠用水量為149.8%,初終凝時間分別為27min、55min,2h抗折、抗壓強度分別為0.295MPa以及0.759MPa,與鈦石膏的物理性能基本一致,由此判斷導致鈦石膏物理性差的因素是氫氧化鐵。針對影響因素對鈦石膏進行了物化激發(fā),實驗結(jié)果表明,鈦石膏的最佳煅燒溫度為180℃,此時試樣的標稠用水量相對于100℃煅燒的試樣下降了15.8%,初終凝時間分別縮短了27min、39min;2h抗折抗壓強度分別為0.46MPa、0.91MPa。經(jīng)酸洗改性,鈦石膏試樣的標稠用水量、初終凝時間、2h抗折抗壓強度均發(fā)生明顯改善,其中標稠用水量降低了10.73%,初終凝時間分別縮短了30.43%、19.61%,2h抗折抗壓強度分別提高了21.96%、70.20%。萘系減水劑對鈦石膏的減水效果最好,其最佳摻量為3.0%。經(jīng)正交實驗確定了復(fù)配激發(fā)劑的最佳配比為:硫酸鈉0.5%、生石灰2.5%、激發(fā)劑K1.5%,此時鈦石膏試樣的物理性能指標如下:標稠用水量80.2%,初終凝時間分別為4min、10min,2h抗折抗壓強度分別為1.63MPa、3.17MPa,基本達到GB/T 9776-28《建筑石膏》的標準要求。最后,研究制備了鈦石膏發(fā)泡材料,研究了雙氧水、穩(wěn)泡劑H以及復(fù)合防水劑對鈦石膏發(fā)泡材料性能的影響,確定了其最佳原料配比為:雙氧水5%,穩(wěn)泡劑H4%,復(fù)合防水劑2%,此時鈦石膏發(fā)泡材料的物理指標如下:密度234kg/m3、導熱系數(shù)0.065W/(m·K)、抗折抗壓強度分別為0.23MPa、0.43MPa、吸水率9.5%,均能滿足《山東省建筑外墻用無機保溫板性能指標要求》的技術(shù)要求。
[Abstract]:As a kind of gypsum resources replacing natural gypsum, titanium gypsum is a valuable asset. Although it has been used in cement retarder and light wall material, it has been used as waste treatment because of its poor hydration activity and hard to be stimulated. This is the industrial byproduct with the smallest application range and the narrowest application range. Based on the form composition simulation method, the cause of high water consumption and low mechanical strength of titanium gypsum is explored. On this basis, two modified methods of physical and chemical modification are used to stimulate the activity of titanium gypsum, improve the physical properties of titanium gypsum, and apply it to the field of building materials, and exploit a new way to promote the resource application of titanium gypsum. The difference between physical form and chemical composition of natural gypsum and titanium gypsum is studied by means of particle size analyzer, X ray fluorescence spectrometer and other instruments. The test results show that the size distribution range of titanium gypsum is narrower than that of natural gypsum, and the average particle size is smaller than that of natural gypsum, and the content of impurity elements, such as Fe, Al, and Si in titanium gypsum, is higher than that in natural gypsum. Content, especially the content of Fe element in titanium gypsum is much larger than that of natural gypsum; the physical properties of titanium gypsum and natural gypsum have great difference, and the thick water amount of titanium gypsum is 2.57 times of the natural gypsum, the setting time is obviously long, the mechanical strength of 2H is very small, and the standard requirement of the GB/T 9776-2008< building gypsum can not be reached. Through control, it is controlled by control. The pulverizing mill was used for grinding the gypsum series. The particle size analysis showed that the specific surface area, the average particle size and the grain gradation were basically the same as the titanium gypsum, and the morphology simulated the state of the titanium gypsum (hereinafter referred to as MTG). The consistency of the MTG was slightly higher than that of the natural gypsum, but it was only 40min. At the same time, the initial setting time of MTG is longer than that of natural gypsum, while the initial setting time of the paste is 6min and 8min, respectively, but 14min and 24min are shorter than that of the titanium gypsum, and the compressive strength of 2h in MTG is reduced by 31.27% and 13.87%, respectively, compared with the natural gypsum, but there is still a significant difference with the titanium gypsum, and its 2H anti folding and anti compression strength is still available. The degree of 134.78%. is 198.15% higher than that of titanium gypsum, which indicates that the physical form of gypsum has a certain effect on the physical properties of the gypsum hydrated hardened body, but it is not the decisive factor that leads to the poor performance of the titanium gypsum. On the basis of MTG, the chemical group is obtained by adding 2.69% silica, 1.23% alumina, 13.01% iron oxide and 17.39% ferric hydroxide. The simulated titanium gypsum (hereinafter referred to as CTG). The experimental results show that the physical properties of the sample have not been obviously changed by adding silica, alumina and iron oxide in turn, but the physical properties of the sample have changed significantly in the addition of iron hydroxide to MTG. The physical properties of MTG have also changed remarkably when the iron hydroxide is mixed with iron hydroxide. At 17.5%, the thick water consumption of the sample is 149.8%, the initial setting time is 27min, 55min, 2h, and the compressive strength is 0.295MPa and 0.759MPa respectively. The physical properties of the titanium gypsum are basically the same, thus judging that the physical poor factor of the titanium gypsum is ferric hydroxide. The results show that the optimum calcining temperature of titanium gypsum is 180 C, at this time the viscosity of the sample is reduced by 15.8% compared with the sample calcined at 100, and the initial setting time is shortened by 27min and 39min respectively. The flexural compressive strength of 2H is 0.46MPa, 0.91MPa. is modified by acid washing, the thick water content of the titanium gypsum sample, the initial end setting time, and the anti compression strength of 2H. The water quantity of the standard thickening was reduced by 10.73%, the initial setting time was reduced by 30.43% and 19.61%, and the flexural compressive strength of 2H was increased by 21.96% respectively. The effect of 70.20%. naphthalene water reducing agent on the water reduction of titanium gypsum was best, and the optimum mixing amount of 3.0%. was confirmed by orthogonal experiment: sodium sulfate 0.5%. Lime 2.5%, activator K1.5%, at this time the physical properties of the titanium gypsum samples are as follows: the standard water consumption is 80.2%, the initial setting time is 4min, 10min, and 2H is 1.63MPa, 3.17MPa, respectively, and basically meets the standard requirement of GB/T 9776-28< building gypsum >. Finally, the titanium gypsum foam material is prepared, and the hydrogen peroxide and stable bubble are studied. The effect of H and compound waterproof agent on the properties of titanium gypsum foam material is determined. The optimum raw material ratio is: hydrogen peroxide 5%, foam stabilizer H4% and compound waterproof agent 2%. At this time, the physical indexes of the titanium gypsum foam material are as follows: density 234kg/m3, thermal conductivity 0.065W/ (M. K), compressive strength of 0.23MPa, 0.43MPa, and water absorption 9.5%, respectively. Foot "technical requirements for the performance requirements of inorganic insulation board for building exterior walls in Shandong".
【學位授予單位】：濟南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ177.37

【參考文獻】

相關(guān)期刊論文 前1條

1 周富濤;石宗利;李福元;;減水劑對脫硫石膏膠凝材料作用的研究[J];非金屬礦;2009年04期

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本文編號：1987387