工程科学学报2017，Vol.39Issue(5)：683-692,10.DOI:10.13374/j.issn2095-9389.2017.05.006
优化配矿强化西澳超细粒磁铁精矿球团焙烧研究
Optimization of feed blends to enhance the roasting performance of pellets made from Western Australian ultrafine magnetite concentrate
朱德庆 1虎训 1潘建 1杨聪聪 1徐梦杰 1王召元2
作者信息
- 1. 中南大学资源加工与生物工程学院, 长沙410083
- 2. 北方重工集团(沈阳)工程设计研究院有限公司,沈阳110027
- 折叠
摘要
Abstract
The conducted roasting tests were studied which pellets were made from blends of Western Australia ultrafine ( WAU) magnetite concentrate and domestic magnetite concentrate or Brazilian hematite concentrate. The results show that the pellets made from 100% WAU magnetite concentrate exhibit inferior preheating and roasting performance under the following conditions:preheating at 1050℃ for 20 min and roasting at 1300℃ for 40 min, with compressive strengths of the preheated and fired pellets of each pellet 502 N and 2313 N, respectively. When blended 40% domestic magnetite concentrate or 20% Brazilian hematite concentrate with 60%or 80% WAU magnetite concentrate, the appropriate preheating and firing temperatures of the pellets are reduced from 1050℃ to 950℃ and 975℃, and from 1300℃ to 1250℃ and 1280℃, respectively. Moreover, the compressive strength of the fired pellets obvi-ously improves to more than each pellet 2500 N. The microstructure of fired pellets made from WAU and domestic magnetite concen-trate is characterized by fully grown Fe2 O3 grains and close interlinkages among the hematite grains, which leads to low porosity and strong consolidation. In contrast, 20% Brazilian hematite concentrate blended with WAU magnetite concentrate yields nearly grown Fe2 O3 grains in the fired pellets and only relatively close interlinkages between the hematite grains. The preheating and roasting per-formance of WAU magnetite concentrate pellets can be improved by optimizing the ore matching.关键词
西澳超细粒磁铁精矿/球团预热焙烧/磁铁精矿/赤铁精矿/优化配矿Key words
Western Australia ultrafine magnetite concentrates/pellet preheating and roasting performance/magnetite concen-trates/hematite concentrates/optimizing ore matching分类
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朱德庆,虎训,潘建,杨聪聪,徐梦杰,王召元..优化配矿强化西澳超细粒磁铁精矿球团焙烧研究[J].工程科学学报,2017,39(5):683-692,10.
