Research
| Title： | Utilization of Cr-Contaminated Oil-Based Drilling-Cuttings Ash in Preparation of Bauxite-Based Proppants |
|---|---|
| First author： | Xie, Pin; Wu, Hongyi; Yang, Hang; Zhang, Yi; Xia, Shibin |
| Journal： | ENVIRONMENTAL ENGINEERING SCIENCE |
| Years： | 2021 |
| DOI： | 10.1089/ees.2020.0490 |
| Abstract： | The utilization of secondary pyrolysis oil-based drilling-cuttings ash (OBDCA-sp) contaminated with Cr (VI) was studied. OBDCA-sp and bauxite were used as raw materials in different ratios to prepare proppants, and performance tests were carried out for the prepared proppants. OBDCA-sp/bauxite proppants had excellent compressive strength and lower density than pure bauxite proppants. A possible reason for this is that the presence of OBDCA-sp exerted an adhesive effect that enhanced the compactness of the proppants. For OBDCA-sp/bauxite proppants with a low mixture ratio of OBDCA-sp to bauxite (<20%), the roundness, sphericity, and other parameters of the proppants were well preserved. Scanning electron microscopy analysis indicated increased surface collapse of proppants with increasing mixture ratio of OBDCA-sp to bauxite. The X-ray diffraction results indicated that increasing the mixture ratio of OBDCA-sp to bauxite resulted in a lower bauxite phase structure in proppants. The X-ray photoelectron spectrum analysis and leaching experiment indicated that the proportion of hazardous Cr was reduced with the enhanced mixture ratio of OBDCA-sp to bauxite. This study provides an economical and ecofriendly method to utilize Cr (VI)-contaminated OBDCA-sp. |
