工程科学学报2016，Vol.38Issue(4)：468-475,8.DOI:10.13374/j.issn2095-9389.2016.04.004
细磨海砂矿烧结特性及其对烧结矿质量影响机理
Sintering characteristics of titanium sands after grinding and its influence mechanism on the quality of sinter
摘要
Abstract
The size distribution, microstructure and high temperature properties of titanium sands after grinding were studied in the paper. The influence and mechanism of titanium sands on the sinter quality were identified by sinter pot test and scanning electron microscopy and energy dispersive spectrometry ( SEM-EDS) test. It is found that the micromorphology of titanium sands becomes more irregular after grinding, and the granulation gets strengthened. Meanwhile, the high temperature characteristics of sintering are differ-ent with the common iron ore fines:when titanium sands become finer, the assimilation temperature improves by 21℃, and the liquid phase fluidity index decreases by 0. 35 at 1280℃. The reason for these differences is that titanium sands after grinding react with CaO to produce more perovskite, which can hinder the assimilation reaction and get the liquid phase stickier. In comparison with unground titanium sands, the reduction index ( RI) of sinters produced with 8% of ground titanium sands in blends improves by 3. 8%. The reasons are that titanium sands are distributed more uniformly in blends after grinding, resulting in the increase of phase particles con-taining titanium in sintered ores, and many microcracks emerge in the reduction reaction, which is in favor of reducing gas diffusion.关键词
海砂矿/烧结/粒级分布/微观结构/同化性/流动性Key words
titanium sands/sintering/particle size distribution/microstructure/assimilation/fluidity分类
矿业与冶金引用本文复制引用
张亚鹏,张建良,王振阳,刘征建,刘兴乐..细磨海砂矿烧结特性及其对烧结矿质量影响机理[J].工程科学学报,2016,38(4):468-475,8.基金项目
国家自然科学基金资助项目(U1260202,51174023) （U1260202,51174023）
