Sahu Kamala Kanta, Alex Thomas C, Mishra Devabrata, Agrawal Archana
Metal Extraction and Forming Division, National Metallurgical Laboratory, Jamshedpur, India.
Waste Manag Res. 2006 Feb;24(1):74-9. doi: 10.1177/0734242X06061016.
To recover pigment grade TiO2, operating plants all over the world use chemical processes. Slag-based technology is considered to be attractive because of low waste generation and low chemical cost due to high titanium content and is poised to replace the conventional technology. This paper provides a review of the slag-based technology with the specific aim to produce leachable slag and achieving high titania yield from recovered wastes. Leachable oxides of the lower oxidation state, such as TiO and Ti2O3, facilitate the leaching process. However, during smelting these oxides increase the viscosity of the slag. Formation of titanium carbide or carbonitride is also not desirable as it leads to resistance to the leaching of titanium. This report highlights the problems and their possible solutions to obtain leachable slag.
为了回收颜料级二氧化钛，世界各地的运营工厂都采用化学工艺。基于矿渣的技术因其产生的废物少且由于钛含量高而化学成本低，被认为具有吸引力，并且有望取代传统技术。本文对基于矿渣的技术进行了综述，其具体目标是生产可浸出矿渣并从回收废物中实现高二氧化钛产量。较低氧化态的可浸出氧化物，如TiO和Ti2O3，有助于浸出过程。然而，在冶炼过程中，这些氧化物会增加矿渣的粘度。碳化钛或碳氮化物的形成也是不可取的，因为它会导致钛的浸出阻力。本报告强调了获得可浸出矿渣的问题及其可能的解决方案。
