Agglomeration and bonding mechanism of typical metallurgical solid wastes  

作　　者：Ting Wu Yu-qi Kong Jiu-chang Zhang Xin-yu Wang Lei Ma Tao Yang Jie Lei Hong-ming Long 

机构地区：[1]School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243032,Anhui,China [2]Key Laboratory of Metallurgical Emission Reduction&Resources Recycling(Anhui University of Technology),Ministry of Education,Ma’anshan 243032,Anhui,China

出　　处：《Journal of Iron and Steel Research International》2023年第7期1390-1400,共11页

基　　金：support from the Outstanding Youth Fund of Anhui Province(Grant No.2208085J19);the National Key Research and Development Program of China(Grant No.2022YFC3901405).

摘　　要：The agglomeration of solid wastes is a key factor for subsequent utilization,while the difficulty in agglomeration and high cost have become common problems in the recycling process.The disk pelletizing process was adopted,based on the optimization method by liquid binder addition,and the influence mechanism of the ratio of typical solid wastes as blast furnace dust(BFD)and sludge generated by oxygen converter gas recovery(OGS)was explored.Meanwhile,the effect of binder solution concentration on the quality of green pellets was studied.Derived from the contact angle detection and infrared spectrum analysis,the liquid bridge model was established to study the bonding mechanism.The results showed that OGS had stronger adsorption effect with binder,and the hydrophilicity of BFD was better.When the concentration of binder was higher than 0.2 wt.%,the contact angle between the binder and BFD was bigger than that with OGS,while the capillary force between particles reduced with larger contact angle.The increment in the binder concentration increased the viscous force between particles and the maximum separation distance.The ultimate drop strength and compressive strength were related to the type of viscous force,and the compressive strength reflected the strength of the force between particles intuitively,while the drop strength represented the comprehensive forces of green pellets.Reasonable combination of BFD and OGS was available for pelletizing process,while the ratio of BFD should not exceed 32.0%,and binder C was added in the form of solution with the addition amount of 0.4 wt.%,which can reduce the cost of binder by 20–30¥/t.

关 键 词：Metallurgical solid waste Iron-bearing dust Organic binder Liquid bridge Green pellet 

分 类 号：X705[环境科学与工程—环境工程]