Research progress of organic binder for iron ore pellets
LI Qian1, MA Yong-he1, TANG Yin-hua2, TANG Fang-jia3, YANG Yong-bin1
1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China; 2. Xinyu Iron and Steel Co., Ltd., Xinyu 338013, Jiangxi, China; 3. Hubei Jinshenglan Metallurgical Technology Co., Ltd., Xianning 437221, Hubei, China
Abstract:With the steel industry's green, low-carbon transformation, the use of organic binder to replace bentonite has become an unavoidable trend in the iron ore pellet process to improve quality and reduce consumption. However, technical barriers to completely replacing bentonite with organic binders have yet to be overcomed, severely limiting its widespread use in industrial production. The bonding effect of organic binder is also an important factor in controlling pellet strength, and understanding its mechanism of action in pellet production is critical for improving pellet strength and developing new organic binders with domestic intellectual property rights. In order to provide theoretical guidance and direction by summarizing the research progress of organic binders in iron ore pellets. The structures and properties of four common organic binders were revealed based on the introduction of the molecular structure model of ideal organic binders. The effect of viscosity and water absorption on the bonding effectiveness of organic binders was discussed. The high viscosity of organic binders can regulate the size of liquid bridge adhesion between pellets, significantly improving green pellet strength; water absorption is an important property of organic binders to regulate the free water content of green pellets, and only with the best water absorption rate can obtain green pellets with high strength and uniform particle size. The common advantages and disadvantages of organic binders are summarized. The main advantages of organic binders are trace efficiency, high burn-off, and little effect on pellet iron grade, while the main disadvantages are a lack of slag phase consolidation in the production of pellet ore and insufficient strength. Analysing the optimization of raw material particle size composition, the addition of boron-containing compounds and dispersants to strengthen the organic binder pellet production control means, and looking forward to the future development of organic binder direction.
李骞, 马永和, 唐银华, 唐方家, 杨永斌. 铁矿球团用有机黏结剂研究进展[J]. 钢铁, 2022, 57(11): 11-21.
LI Qian, MA Yong-he, TANG Yin-hua, TANG Fang-jia, YANG Yong-bin. Research progress of organic binder for iron ore pellets[J]. Iron and Steel, 2022, 57(11): 11-21.
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