利用含钙含铁冶金渣制备辉石质陶瓷的基础研究

About half of the world's iron and steel metallurgical slag is discharging in China, and there is an urgent need for improvement on quality and quantity of utilization for these metallurgical slag resources. Most of the slag have the characteristics of large amount of calcium oxide or iron oxide components. In order to utilizing the slag with a large content and high added value, a new research idea was put forward that the metallurgical slag as main raw materials were convent into ceramics with pyroxene group minerals as main crystals (pyroxene ceramics ) which is of high calcium oxide and iron oxide content. In the project, basic research on preparing pyroxene ceramics by metallurgical slag would be conducted, using high temperature XRD, hot stage microscopy and other analytical methods. Steel slag which have high calcium oxide and iron oxide contents was selected as the typical metallurgical slag. The research will focus on two key scientific problems, occurrence and evolution of high content of calcium oxide and ferric oxide components, and densification mechanism of pyroxene ceramics in sintering process. This research will break through the limitations of traditional ceramics to content of calcium oxide and ferric oxide, build systematic preparation theories of pyroxene ceramics with high content of calcium oxide and ferric oxide, initially set up basic technology theories for converting metallurgical slag to high value added ceramics, and apply it into preparation process of ceramics derived from other metallurgical solid wastes. Research achievements of this project would provide basic technology theories for conversion of a large number of industry and mining solid wastes, which have high content of calcium oxide and iron oxide, to high value added ceramics,furthermore, promote formation of a new recycle economy industrial chain, iron and steel making-metallurgical slag discharging-ceramics producing.

我国每年钢铁冶金渣产量约占世界渣量的一半，这些冶金渣存在资源化利用率和利用水平进一步提高的迫切需求。针对冶金渣多具有大量氧化钙或氧化铁组分的特点，本课题提出将冶金渣作为陶瓷原料，制备同样具有高钙高铁组分的辉石质陶瓷的研究思路，以实现冶金渣的高效高值利用。 课题以钢渣为研究对象，采用高温 XRD、热台显微镜等分析手段，围绕陶瓷烧结过程中大量氧化钙、氧化铁组分赋存状态演变规律和辉石质陶瓷致密化机理的关键科学问题，开展利用冶金渣制备辉石质陶瓷的基础研究。研究将突破传统陶瓷对氧化钙、氧化铁含量的限制，形成具有高钙高铁组分辉石质陶瓷的系统制备理论，初步建立利用冶金渣制备高附加值陶瓷的技术基础体系，并应用于利用其它冶金固体废弃物的陶瓷制备过程。本课题的研究成果将为工矿业中的其它大量含钙含铁废弃物制备高附加值陶瓷奠定技术理论基础，并推动钢铁行业形成钢铁冶炼-冶金渣排放-陶瓷制备的新的

我国每年约产生世界一半的钢铁冶金渣，这些冶金渣存在资源化利用率和利用水平进一步提高的迫切需求。针对冶金渣多具有大量氧化钙或氧化铁组分的特点，项目提出将冶金渣作为陶瓷原料，制备同样具有高钙高铁组分的辉石质陶瓷的研究思路，以实现冶金渣的大掺量高附加值利用。课题以钢渣为研究对象，围绕大量氧化钙、氧化铁组分在陶瓷烧结过程中赋存状态演变规律和辉石质陶瓷致密化机理的关键科学问题，开展利用冶金渣制备辉石质陶瓷的基础研究。.研究突破传统陶瓷对氧化钙、氧化铁含量的限制，形成具有高钙高铁组分的辉石质陶瓷的系统制备理论，并揭示了辉石陶瓷体系的烧结机理：与传统三元陶瓷体系不同，辉石陶瓷体系的烧结过程可以划分为原料脱水及分解（<800C）、初结晶（700~1100C）和致密化与二次析晶（1100~1220C）三个阶段。高钙组分在在较低温度下（700~1100C）完成结晶过程，生成的透辉石等晶体在后续烧结致密化过程中起到重要的骨架支撑作用；在>1150C时钙长石、钙铁榴石等组分形成液相促进了样品的快速致密化，并且由于液相的产生促进了二次析晶过程的进行，使得制品形成单一的普通辉石相，有助于力学性能的提升。研究利用高温原位XRD首次获得了辉石质陶瓷在烧结过程中辉石为骨架结构、钙长石为熔剂的直接证据。.研究还获得了两个规律和两个准则，即：氧化钙、氧化铁关键组分在烧结过程的作用规律，辉石质陶瓷烧结区间的调控规律，辉石质陶瓷的性能设计准则，重金属稳定固结的设计准则。实际申请相关发明专利10项，其中授权3项，授权PCT专利1项；发表第1标注论文11篇，其中SCI、EI检索论文9篇，TOP期刊3篇。.研究初步建立了不同钢渣掺量、不同陶瓷体系、不同烧结制度下的钢渣辉石质陶瓷性能数据，并通过示范生产和应用，取得了初步的实际应用数据。研究初步建立了利用冶金渣制备高附加值陶瓷的技术基础体系，并应用于利用其它冶金固体废弃物的陶瓷制备过程，为工矿业中的大量含钙含铁废弃物制备高附加值陶瓷奠定技术理论基础。