低品位表外磷铁矿在高磷酸性废水资源化利用中的除磷特性与机理研究

The sustainable development of iron and steel industry is seriously restricted by the shortage of high grade iron resources. So, the high-phosphorus iron ores with abundant reserves is urgently be explored and utilized as the supplementary resources. The key problem to be solved is reducing the phosphorus content in the ores. Research indicates the acid leaching dephosphorization is an effective phosphorus removal method. Unfortunately, acid wastewater with high phosphate produced in acid leaching dephosphorization process, which is a problem needed to be solved urgently. Our previous work indicates that the wasted low grade iron ore with phosphorus (WLGIOWP) detached during the mining of high-phosphorus ores possess a good phosphate adsorption performance. To achieve the breakthrough of the resource utilization of WLGIOWP, the phosphate removal characteristic and mechanism of WLGIOWP as well as comprehensive utilization of the residue produced in the process of phosphorus removal need to be clarified. In present research project, WLGIOWP is firstly proposed to be used as the adsorbent for phosphate removal of the high-phosphate acid wastewater. The surface characteristics of WLGIOWP will be intensively studied using a series of advanced methods including scanning electronic microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). To clarify the phosphate removal mechanism of WLGIOWP in the acid waste water, the non-electrostatic surface complexation model is proposed to be introduced to establish the complexation model of phosphate adsorption. The methods of comprehensive utilization of the residue produced in the process of phosphorus removal will be explored by combining desorption method and selective precipitation method. In addition, an innovative approach to treat acid wastewater using the wasted low grade iron ore is put forward from the viewpoint of interfacial adsorption in present project. The research outcomes have significant science and engineering meanings for the utilization of high-phosphorus ores, phosphate removal application of WLGIOWP as well as the reuse of WLGIOWP.

优质铁矿资源的短缺严重制约了我国钢铁工业的可持续发展，因而储量丰富的高磷铁矿作为补充资源，其开发和利用已迫在眉睫。需要解决的关键问题是降低矿石的磷含量。研究表明，酸浸法是一种有效的脱磷方法，但产生的大量高磷酸性废水，成为亟待解决的难题。在前期研究中发现废弃的低品位表外磷铁矿（简称表外矿）具有良好的吸附除磷效果，但要实现其资源化利用，尚需对其吸附除磷特性和机理以及除磷渣的综合利用等问题进行深入研究。本项目拟以高磷酸性废水为研究对象，采用表外矿作为吸附剂，运用SEM、XRD和FTIR等技术，阐明表外矿的表面特性；引入无静电模式建立配位吸附模型，揭示表外矿对酸性废水的除磷机理；联合解吸法和选择性沉淀法探索除磷渣的综合利用途径。本项目拟从界面吸附角度，提出采用表外矿处理酸性废水的新思路。研究成果为高磷铁矿的开发、表外矿的吸附除磷及实现“以废治废”奠定重要的理论和实际应用基础。

优质铁矿资源的短缺严重制约了我国钢铁工业的可持续发展，因而储量丰富的高磷铁矿作为补充资源，其开发和利用已迫在眉睫。需要解决的关键问题是降低矿石的磷含量。研究表明，酸浸法是一种有效的脱磷方法，但产生的大量高磷酸性废水，成为亟待解决的难题。针对该难题，本项目以高磷酸性废水为研究对象，采用低品位表外磷铁矿作为吸附剂，运用SEM、XRD和FTIR等技术，阐明低品位表外磷铁矿的表面特性；引入了无静电模式建立配位吸附模型，揭示了低品位表外磷铁矿对酸性废水的除磷机理；探索除磷渣的综合利用途径。本项目拟从界面吸附角度，提出了采用低品位表外磷铁矿处理高磷酸性废水的新思路。研究成果为高磷铁矿的开发、低品位表外磷铁矿的吸附除磷及实现“以废治废”奠定了重要的理论和实际应用基础。项目共计发表境内外学术论文7篇，其中SCI/EI检索6篇，获得中国有色金属工业科学技术奖三等奖1项，授权发明专利3项，培养硕士研究生1名，培养数名本科生，完成项目计划研究内容，达到了预期目标。