α型发泡石膏的制备及工艺参数对性能影响的研究

发布时间：2018-07-03 16:31

  本文选题：α型发泡石膏 + 力学性能　； 参考：《北京交通大学》2017年硕士论文

【摘要】：脱硫石膏作为热电厂产量及储量最大的工业副产品,对其进行合理利用具有重要的环保意义及经济意义。α型高强石膏具有优良的理化性能及广泛的应用,是实现脱硫石膏固废资源化利用的有效途径。本文以α型高强石膏为原料,以铝粉为发气剂进行发气反应制备αα型发泡石膏,关注产物的抗压抗折强度与软化系数,并将宏观性力学性能与孔结构相结合进行分析,利用Matlab图像处理程序对孔结构进行计算表征,利用XRD、SEM手段对产品微观结构进行表征,综合考虑各方面影响,最终确定最优配比。主要研究结果如下:(1)采取控制变量法,通过单因素实验考察水灰比、铝粉用量、发气温度、生石灰用量、稳泡剂及缓凝剂用量对产品抗压抗折强度、软化系数及孔径分布的影响,确定了各影响因素较好的掺加范围。结果表明:水料比为0.60-0.65,铝粉用量为0.3%-0.4%,发气温度为40℃左右,生石灰用量为10%-13%,稳泡剂用量1.2%-1.3%,缓凝剂用量为0.04%时可以保证制得具有良好性能的发泡石膏。(2)采用正交试验探讨在发泡石膏生产过程中各因素之间的交互作用,对实验结果进行极差分析,确定以不同性能为产品指标的最优生产条件。结果表明:以密度、抗压强度、抗折强度作为性能指标,最关键影响因素为水灰比与温度;以比强度作为性能指标,最关键影响因素为水灰比与氧化钙。综合考虑各方面因素,最终优化出本次α型发泡石膏的最优配比为:水灰比0.61,铝粉掺量为0.36%,生石灰掺量12.80%,硬脂酸钙掺量1.20%,发气温度为37℃,柠檬酸掺量为0.04%。(3)将Matlab图像处理技术应用于α型发泡石膏内部孔结构的分析。编写出了适用于本实验产物的分析程序,并对该程序的可行性进行了验证,对误差来源进行了讨论。同时从物理化学角度对误差产生原因进行了相关解释。
[Abstract]:Desulphurization gypsum, as the industrial by-product with the largest output and reserves in thermal power plants, has important environmental and economic significance in its rational utilization, and 伪 type high strength gypsum has excellent physical and chemical properties and wide application. It is an effective way to realize solid waste utilization of desulphurized gypsum. In this paper, 伪 type foaming gypsum was prepared from 伪 -type high strength gypsum and aluminum powder as gassing agent. The compressive flexural strength and softening coefficient of the product were concerned, and the macro mechanical properties and pore structure were analyzed. The pore structure was calculated and characterized by Matlab image processing program, and the microstructure of the product was characterized by means of XRDX SEM. The main results are as follows: (1) by using the method of controlling variables, the compressive and flexural strength of the product was investigated by single factor experiment, such as water-cement ratio, amount of aluminum powder, temperature of gas generation, dosage of quicklime, amount of foam stabilizer and retarder. The influence of softening coefficient and pore size distribution on the addition range of each factor was determined. The results show that the ratio of water to material is 0.60-0.65, the amount of aluminum powder is 0.3-0.4, and the gas temperature is about 40 鈩，

本文编号：2094255