工程科学学报2016，Vol.38Issue(7)：899-905,7.DOI:10.13374/j.issn2095-9389.2016.07.002
膏体充填用矿渣--钢渣基胶结剂协同固化Pb2+
Solidification/stabilization of Pb2+ within a blast furnace slag--steel slag based cementing agent for paste backfilling
摘要
Abstract
Backfilling material specimens were prepared with Pb-bearing ore tailings and a blast furnace slag-steel slag based ce-menting agent ( BSCA) used as a replacement for cement in traditional backfilling materials. Other types of specimens with ordinary Portland cement (P·I 42. 5) as cementing agents were also made for comparison. Flowability and compressive strength tests were per-formed to study the working performance of the specimens, and leaching tests were done to investigate the immobilization of Pb2+ in the specimens. The phase composition of the hydrated specimens was analyzed by means of X-ray diffraction, Fourier transform infrared spectroscopy and differential scanning calorimetry. It is found that the backfilling material with BSCA has a flowability of 50 mm higher than that with ordinary cement. The 28-d compressive strength of the BSCA-based specimens reaches 3. 0 MPa, which meets the strength requirement for underground backfilling. The quantities of Pb2+ leached from the BSCA-based specimens aged for 28 d are be-low 0. 05 mg·L-1 , which is the threshold value of Pb2+ concentration for TypeⅢground water in Chinese quality standard for ground water GB/T 14848—93. In comparison, the quantities of Pb2+ leached from the cement-containing specimens aged for 28 d are 0. 1 mg ·L-1 . The reason for this higher immobilization degree of Pb2+ in the hydrated BSCA-based specimens is that a higher amount of ettringite forms in them. Moreover, the formation of zeolite-like facies in the hydrated BSCA-based specimens is favorable for immobili-zing Pb2+.关键词
冶金渣/胶结充填/固化/稳定化/铅Key words
metallurgical slag/paste backfilling/solidification/stabilization/lead分类
资源环境引用本文复制引用
阎爱云,倪文,黄晓燕,张静文,李亚奇,徐东..膏体充填用矿渣--钢渣基胶结剂协同固化Pb2+[J].工程科学学报,2016,38(7):899-905,7.基金项目
国家自然科学基金资助项目(41472043) （41472043）
