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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 6    June 2021

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Sintering behavior and mechanical properties of sintered ceramics based on spodumene tailings
YANG Jie(杨洁)1, XU Long-hua(徐龙华)1, 2, WU Hou-qin(巫侯琴)1, WANG Zhou-jie(王周杰)1, SHU Kai-qian(舒开倩)1, XU Yan-bo(徐妍博)1, LUO Li-ping(罗利萍)1, TANG Zhen(唐珍)2

1. Key Laboratory of Solid Waste Treatment and Resource Recycle (Ministry of Education), Southwest University of Science and Technology, Mianyang 621010, China;
2. State Key Laboratory for Environment-friendly Energy Materials, Southwest University of Science and
Technology, Mianyang 621010, China

Abstract:In this study, ceramics was prepared by slip casting (no pressure was used during shaping step) and atmospheric pressure sintering with low-melting point glass (LPG) powder as the binding material to facilitate the transformation of spodumene flotation tailings (SFTs) into ceramics at lower temperatures. The influence of sintering temperature and mass ratio of LPG on the mechanical properties (flexural strength and compressive strength) of ceramic materials was studied by orthogonal test. The results showed that when the mass ratio of LPG powder was higher than or equal to 20 wt% and the sintering temperature was higher than or equal to 550 °C, mutual adhesion between the sample particles was realised and consequently the ceramic materials could be prepared with good mechanical properties (the maximum flexural strength=19.55 MPa, the maximum compressive strength=42.25 MPa, average porosity=24.52%, average apparent density=1.66 g/cm3, and average water absorption=14.79%). The sintered ceramics were characterized by XRF, XRD, optical microscopy analysis, SEM, TGA-DSC and FT-IR. The formation of liquid phase at high temperature may lead to the mutual bonding between particles, which might be the main reason for the improvement of mechanical properties of ceramic materials. Overall, SFTs were successfully sintered at low temperature to prepare ceramic materials with good mechanical properties, which are crucial for energy conservation and environmental preservation.

 

Key words: spodumene tailings; low-temperature sintering; ceramic materials; mechanical property

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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