油田污泥基高强陶粒的制备及性能优化

为了解决危废油田污泥的堆存处置问题,研制了一种以油田污泥(简称油泥)为原料,以黄土、黄沙和黏土为添加剂的油泥烧结陶粒。通过单因素试验探究油泥最大掺量及最佳烧制工艺条件,并利用电子扫描电镜(SEM)、X射线衍射仪(XRD)和能谱仪(EDS)探究陶粒的显微结构、物相组成和内外层元素分布特征。结果表明,在油泥掺量为60%(质量分数),烧结温度为1 140 ℃,烧结时间为20 min时可以得到低吸水率、高抗压强度的目标陶粒。在最佳条件下,参照GB/T 17431.1—2010《轻集料及其试验标准》烧结的油泥陶粒1 h吸水率为0.32%,堆积密度为1 020.3 kg/m³,筒压强度为40.992 MPa。

Preparation and Properties Optimization of High StrengthCeramsite Obtained from Oily Sludge

To solve the disposal problem of hazardous waste oily sludge,a high sludge doping sintered ceramsite which used oily sludge as raw material,loess,sand and clay as additives was prepared.The maximum content and the best conditions were tested by single factor experiment.The microstructure,phase composition and element distribution in the inner and outer layers of the ceramsite were investigated by scanning electron microscopy (SEM),X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS).Results show that when the sludge content is 60% (mass fraction),the sintering temperature is 1 140 ℃,and the sintering time is 20 min,the target ceramsite with low water absorption and high compressive strength is obtained.Based on GB/T 17431.1—2010 "Light weight aggregate and its test methods",the ceramsite 1 h water absorption is 0.32%,the bulk density is 1 020.3 kg/m³ and the barrel pressure strength is 40.992 MPa under the best conditions.