弱磁性铁矿物资源的自磁化研究

The huge weakly-magnetic iron mineral resources,namely non-traditional iron sources, such as weakly-magnetic iron ores,weakly-magnetic tailings and red mud, etc., are presently not properly used industrially due to the separation difficulty.Unlike the previous surface magnetization with addition of magnetic seeds,so-called 'self-magnetization' means strenghening the surface magnetization of weakly-magnetic iron minerals without adding any iron-containing substances. Fundamentally, this technique takes advantage of the presence of iron ions with various valences in one system, and produces the fine and active strongly-magnetic particles by adjusting the conditions of the pulp, resultantly intensifying the recovery of the weakly-magnetic iron minerals. The main contents to be studied are as follows: the self-magnetization of single pure iron minerals,the self-magnetization of mixed minerals or real weakly-magnetic iron resources,the influence of impurities, selective magnetic separation by using reagents,characterizing the products of self-magnetization and building the relationship between the products' properties and reaction conditions,establishing the models of selective reagents for magnetic separation and probing the mechanism of selective magnetic separation,etc. The purpose of this programm is to improve the efficiency of recovering the weakly-magnetic iron minerals, realize the simple,clean and energy-saving mining production, and provide conceptual flowsheet and basic theories of self-magnetization through systematic investigations as well. Innovative points of this programm are as follows:self- surface magnetization of weakly-magnetic iron minerals in an aqueous system with no magnetic seeds； selective magnetic separation using new regeants，and increasing the controllable variables and mechanistic levels of mangetic separation.

弱磁性铁矿物资源，包括难选弱磁性铁矿、弱磁性铁尾矿和赤泥等非传统性铁资源，存量大、分离难，是尚未很好利用的宝贵铁资源。与以往磁种表面磁化不同，弱磁性铁矿物资源'自磁化'是在不添加任何含铁磁种的情况下，增强弱磁性铁矿物的表面磁性。原理是利用铁矿资源中一般含有不同价态的铁元素的组成特性，适当调节矿浆体系，就可以在体系中形成微细且活性很高的强磁性粒子，从而强化弱磁性铁矿物资源的回收。研究内容: 纯弱磁性铁矿物体系的自磁化、多元或实际弱磁性铁矿物资源的自磁化、杂质的影响、药剂对磁选选择性控制、自磁化反应产物特征及其与反应条件的关系、磁选药剂选择性的模型和机理等。通过弱磁性铁矿物的自磁化研究，提高弱磁性铁矿物资源的回收效率，实现简单、洁净和低能耗矿业生产；提供系统的自磁化概念流程和基础理论体系。项目创新处：弱磁性铁矿物水介质中无需磁种的表面自磁化；药剂调节磁选选择性，扩展磁选操作参数的可控维数和层级

与以往磁种表面磁化不同，弱磁性含铁矿物资源‘自磁化’是在不添加任何含铁磁种的情况下，增强弱磁性铁矿物的表面磁性，主要是利用铁矿资源中一般含有不同价态的铁元素的组成特性，适当调节矿浆体系pH和温度，就可以在体系中形成微细且活性很高的强磁性粒子，从而强化弱磁性铁矿物资源的回收。通过测定矿物表面磁化前后的磁学性能变化、表面物质成分和Fe2p电子结合能的变化、表面状态的显微观测和拍照以及磁选回收的方法来评价自磁化的效果。该项目研究内容包括: 纯弱磁性含亚铁矿物（菱铁矿和黄铁矿）的自磁化、多元（赤铁矿-菱铁矿-石英体系）和实际弱磁性铁矿物资源的自磁化、自磁化反应产物特征（磁性、表面元素组成和价态变化）及其与反应条件的关系、多极性药剂对磁种的表面改性、超分散剂对磁选选择性控制、弱磁搅拌预磁强化矿物对磁种的吸附效率、自磁化磁种在浮选分离中的应用，等等。通过弱磁性铁矿物的自磁化研究，提高弱磁性铁矿物资源的回收效率；提供了系统的自磁化概念流程和基础理论体系。项目创新处：弱磁性含亚铁矿物水介质中的表面自磁化；含亚铁矿物资源的协同自磁化；弱磁搅拌预磁强化磁种的吸附；超分散剂调节磁选选择性；多极性药剂对磁种的表面改性和表征；扩展磁选操作参数的可控维数和层级（至矿浆pH和温度、金属离子和药剂的种类和用量等）；自磁化磁种作为物理药剂在浮选中的应用。