ABSTRACT

This part reviews the goals of introducing organic binders into iron ore pelletization. Organic binders present a relatively small number of unique binding options but provide an extraordinary amount of flexibility in how to apply them. The key factors that lead into an effective organic binder are good dispersion into the iron ore, the ability to maintain the dispersion of the iron ore during the binding process, and limited water retention. The factors leading into a useful organic binder are more complex, depending on the availability of the material locally and the downsides it may introduce in the form of impurities (e.g. in some cases sulfur, phosphorous) or from poor quality control, especially for waste materials. Organic binders are primarily important because they do not typically introduce silica into the pellet, they are effective at lower overall weight dosages, and are more readily available in some locations than high-quality bentonite binders. A significant amount of emphasis is placed on the impact of organic binders on pellet strength, as the typically low dosages and the combustion of organic binders during firing means that most other pellet properties that would be negatively impacted by the presence of a binder are non-issues. Controlling dustiness among pellets formed with organic binders is also a major concern with several novel methods explored in recent years.

摘要

本部分回顾了将有机粘合剂引入铁矿石球团的目标。有机粘合剂提供了相对较少的独特粘合选项，但在如何应用它们方面提供了极大的灵活性。形成有效有机粘合剂的关键因素是在铁矿石中的良好分散性、在粘合过程中保持铁矿石分散性的能力以及有限的保水性。导致有用的有机粘合剂的因素更为复杂，这取决于材料在当地的可用性以及它可能以杂质形式（例如在某些情况下为硫、磷）或质量控制不佳（尤其是废料）形式引入的不利因素. 有机粘合剂非常重要，因为它们通常不会将二氧化硅引入颗粒中，它们在较低的总重量剂量下有效，并且在某些地方比高质量膨润土粘合剂更容易获得。人们非常重视有机粘合剂对颗粒强度的影响，因为通常低剂量和有机粘合剂在烧制过程中的燃烧意味着大多数其他会因粘合剂的存在而受到负面影响的颗粒特性是非-问题。控制用有机粘合剂形成的颗粒之间的粉尘也是近年来探索的几种新方法的主要关注点。由于典型的低剂量和燃烧过程中有机粘合剂的燃烧意味着大多数其他会因粘合剂的存在而受到负面影响的颗粒特性都不是问题。控制用有机粘合剂形成的颗粒之间的粉尘也是近年来探索的几种新方法的主要关注点。由于典型的低剂量和燃烧过程中有机粘合剂的燃烧意味着大多数其他会因粘合剂的存在而受到负面影响的颗粒特性都不是问题。控制用有机粘合剂形成的颗粒之间的粉尘也是近年来探索的几种新方法的主要关注点。