利用多次循环钙基材料制备镁钙耐火材料的研究

发布时间：2018-02-12 09:57

本文关键词： 改性石灰石 CO2捕集循环煅烧性能测定镁钙耐火材料　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：本论文主要是研究利用添加了氧化镁(Mg O等)的石灰石(产地:陕西富平)(粒度40μm)对工业CO2废气的循环捕集以及利用煅烧石灰石废料来制备高钙基镁钙耐火材料。本课题的创新点在于利用经过多次循环煅烧/碳酸化试验的石灰石废料与一定比例Mg O以及粘结剂相复合来制备镁钙基耐火材料,并对其性能进行了表征。论文第一部分主要是研究改性后的石灰石(采用Mg O改性)在多次循环煅烧/碳酸化过程中对CO2的捕集能力。因为改性石灰石颗粒在经过多次高温循环煅烧后表面会发生严重的烧结现象,从SEM照片中可以清楚的看到这一变化过程,所以利用这种材料制作镁钙基耐火材料具有一定的研究价值,并且在理论上也可以提高镁钙基耐火材料的抗水化性能,并可充分利用CO2循环捕集所产生的煅烧石灰石废料。研究课题主要从三个方面进行:1、利用金属氧化物来对钙基材料进行改性,并完成其堆积态下对CO2捕集性能研究;2、选取改性效果较好的金属氧化物以及配比来完成钙基材料对CO2捕集的放大试验(即半悬浮态试验),与此同时,可以产出公斤级煅烧石灰石废料;3、利用上述试验产生的废料制作镁钙基耐火材料并研究其性能。试验结论如下:1:在利用不同金属氧化物(Mg O/Si O2/Fe2O3)改性钙基吸收剂堆积态实验过程中,研究发现:经过十几次循环煅烧/碳酸化试验后,利用Mg O(掺量为1%)改性的钙基材料对CO2的捕集性能优于其他金属氧化物;同时,石灰石颗粒表面发生严重的烧结。2:选取Mg O(掺量为1%)修饰的钙基材料进行半悬浮态试验,并将经过一次煅烧之后的改性石灰石分成两份做对比试验,一份进行水化处理后进行对比试验,另一份不做任何处理。在高温回转炉中完成100次循环煅烧之后,我们发现经过水化改性的钙基材料的表面烧结情况比未经处理过的材料更为明显。3:将上述试验产出的两种废料分别按照如下比例制作成耐火材料:分别按55.12wt%、44.88wt%添加Mg O,同时按52.1%、42.9%、5%的比例添加不同种类有机粘结剂,制备镁钙耐火材料,最终发现利用酚醛树脂作为有机粘结剂时耐火材料的抗水化性能、微观形貌分析以及抗压强度都相对突出。
[Abstract]:In this paper, the circulating capture of industrial CO2 waste gas by adding MgO, MgO, etc. (from Fuping, Shaanxi Province, 40 渭 m) and the preparation of magnesia-calcium refractories with high calcium base by calcined limestone waste materials are studied in this paper. The innovation of this project lies in the preparation of magnesia-calcium-based refractories by using limestone waste after repeated cycle calcinations / carbonation tests combined with a certain proportion of MgO and binder. The first part of this paper is mainly about the trapping ability of modified limestone (modified with MgO) to CO2 during repeated cycle calcination / carbonation. After repeated high temperature cycle calcination, serious sintering will occur on the surface. The process of this change can be clearly seen from the SEM photos, so the use of this material to make magnesia-calcium based refractories has certain research value, and in theory can also improve the hydration resistance of magnesia-calcium based refractories. And it can make full use of calcined limestone waste produced by CO2 cycle capture. The research topic is mainly from three aspects: 1, using metal oxides to modify calcium based materials, The trapping performance of CO2 was studied under the stacking state. The metal oxides and the ratio of the modified metal oxides were selected to complete the scale-up test of CO2 trapping by calcium based materials (that is, semi-suspended state test), and at the same time, Calcined limestone wastes of kg / kg can be produced to produce magnesium-calcium based refractories and their properties are studied. The test results are as follows: the calcium based absorbent reactor is modified by using different metal oxides (MgO / Sio _ 2 / Fe _ 2O _ 3). In the process of product state experiment, It is found that after more than ten cycles of cyclic calcinations / carbonation tests, the trapping performance of CO2 modified with MgO (1%) is superior to that of other metal oxides. Serious sintering occurred on the surface of limestone particles. The calcium based material modified by mg O (mg O = 1) was selected for semi-suspension test, and the modified limestone after one calcination was divided into two parts for comparative test. One is treated by hydration and the other is treated without any treatment. After 100 cycles of calcinations are completed in a high temperature rotary furnace, We found that the surface sintering of the hydrated calcium based material was more obvious than that of the untreated material. The two kinds of wastes produced by the above test were made into refractories in the following proportion: 55.12 wtt% 44.88 wt% respectively. Mg O, at the same time adding different kinds of organic binders in the proportion of 52.1% to 42.9%, Finally, it was found that the hydration resistance, micro-morphology analysis and compressive strength of the refractories with phenolic resin as organic binder were relatively outstanding.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ175.7

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