Functions and molecular structure of organic binders for iron ore pelletization
Functions and molecular structure of organic binders for iron ore pelletization
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DOI：
10.1016/s0927-7757(03)00264-4
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发表时间：
2003-08-29
影响因子：
5.2
通讯作者：
Wang, DZ
中科院分区：
文献类型：
--
作者：
Qiu, GZ;Jiang, T;Wang, DZ
在过去的几十年里，铁矿石球团的有机粘合剂被广泛研究，因为它们不会污染产品。本文主要根据分子设计、界面化学、高分子科学的基本原理以及粘结体系的失效模型，研究了铁矿石球团理想有机粘结剂的功能和分子结构。研究表明，良好的润湿性、较大的粘结力和内聚力以及良好的热稳定性是铁矿球团粘结剂的基本性能。提出了有机粘结剂的分子结构模型[X-P-Y]（n）。计算了电离势、电子亲合势、基团电负性、键离子性和键能，并应用于极性基团（X）和亲水基团（Y）的选择和判断。从聚合物结构与性能的关系出发，研究了有机链骨架（P）和聚合度（n）。结果表明，-COO（-）和-OH分别是铁矿球团有机粘结剂的优良极性基团和亲水性基团，具有不饱和烃链和环状芳香结构的有机骨架是最佳的铁矿球团有机粘结剂。在此基础上，合成并制备了两种有机粘结剂，它们对铁精矿球团有较好的粘结效果。其中一种已在中国的铁矿球团工业生产中使用。(C)2003 Elsevier B. V.保留所有权利。
Organic binders of iron ore pellets were widely investigated in past decades because they do not contaminate the product. This paper mainly involves the functions and molecular structure of ideal organic binders for iron ore pelletization based on fundamental principles of molecular design, interface chemistry, polymer science as well as failure model of a binding system. Investigation shows that good wettability, great adhesive and cohesive forces as well as fine thermal stability are essential functions of binders for iron ore pelletization. The molecular structure mold [X-P-Y](n) of organic binders is proposed. Ionization potential, electron affinity, group electronegativity, bond ionicity and bond energy are calculated and/or applied in the selection and judgement of polar group (X) and hydrophilic group (Y). Organic chain skeleton (P) and polymerization degree (n) are investigated on the basis of the structure-property relationships of polymers. It is shown that -COO(-) and -OH are excellent polar group and hydrophilic group of organic binders of iron ore pellet, respectively, and organic skeletons with unsaturated hydrocarbon chain and ring aromatic structure are the best for organic binders of iron pellets. Two kinds of organic binders are synthesized and prepared on the basis of the investigations and they are found to be effective for pelletizing of iron ore concentrates. One of them has been used in commercial production of iron ore pellets in China. (C) 2003 Elsevier B.V. All rights reserved.