高碳粉煤灰超轻空心陶粒的制备

以高碳粉煤灰、凝灰岩和膨润土为主要原料,SiC和CaF_2分别作为发泡剂和助熔剂。原材料经磨细、筛选、混合、成球、晾干和高温焙烧等一系列程序后制成空心陶粒。用均匀试验法和单因素实验法探索原料用量、SiC添加量、CaF_2添加量以及烧结温度对陶粒物理性能的影响。确定最优配比和最佳温度后,对陶粒的表观密度、抗压碎强度、吸水率和软化系数进行测试。此外,还利用X射线衍射仪对陶粒原料和成品进行物象分析。结果表明,当高碳粉煤灰∶膨润土∶凝灰岩=40∶15∶47. 5、碳化硅用量为0. 6%、氟化钙用量为0. 5%、烧结温度为1 300℃时,可获得空心陶粒;此时,陶粒的堆积密度为187 kg/m~3,筒压强度为0. 204 MPa,24 h吸水率为1. 48%,软化系数为0. 833。

Preparation of high carbon fly ash ultralight hollow ceramsite

High carbon fly ash , tuff and bentonite are used as main raw materials, SiC and CaF₂ are used as foaming agent and flux respectively. The raw materials are made into hollow ceramsite after a series of procedures such as grinding, screening, mixing, forming, drying and high temperature roasting. Uniform test method and single factor experiment method were used to explore the effects of raw material dosage, SiC addition, CaF2 addition and sintering temperature on the physical properties of ceramsite. The apparent density,point strength,water absorption and softening coefficient of the ceramsite are tested after the optimal ratio is determined. In addition, X-ray diffractometer is used to image the ceramsite raw materials and finished products. The results show that when high carbon fly ash: bentonite: tuff = 40:15:47.5, the dosage of SiC is 0.6%,the dosage of CaF₂ is 0.5%,sintering temperature is 1300₀C, hollow ceramsite can be got; At this time, the ceramsite has a bulk density of 187 kg/m₃, a cylinder compressive strength of 0.204 MPa, a 24-hour water absorption rate of 1.48%, and a softening coefficient of 0.833.