活性炭催化氧化亚熔盐介质低温高效分解含铬钒渣应用基础研究

Vanadium and chromium are important strategic metals with limited global reservation. Titanomagnetite is one of the major polymetallic mineral resources in China, and usually contains substential amount of V/Cr/Fe/Ti compounds. Especially in Panxi region, the reservation of high chromium titanomagnetite ore is large. High temperature sodium roasting is the main method for extracting vanadium from vanadium slag obtained from titanomagnetite ore . However, due to the stability of vanadium and chrome spinel phase in vanadium slag, and the mass transfer barrier inherented with the high roasting temperature technology, the recovery of vanadium is very low and the chromium cannot be recovered, creating significant environment burden. This project proposed a novel method to treat vanadium slag by using activated carbon as oxidation catalyst to intensify the decomposition process in sub-molten salt medium. By study the activated carbon catalytic oxidation mechanism of vanadium slag decomposition in sub-molten salt medium, and the activated carbon recycling methods, a new method for the decomposition of vanadium slag based on the catalytic oxidation effect of activated carbon in alkali media will be established. The research results from this project will contribute to the formation of new theory and new method for efficient and green utilization of vanadium and chromium containing resrouces, providing theoretical basis to improve the comprehensive utilization level of China's titanomagnetite resources, benifiting the utilization of 3.6 billion tons of high chromium content titanomagnetite resources in China. On the other hand, it is expected that a hydrometallurgy platform based on the activated carbon catalytic oxidation intensified alkali media to treat suboxide amphorteric metal resrouces will be formed.

钒、铬是全球性稀缺资源和重要战略金属。钒钛磁铁矿是我国重大特色多金属矿产资源，钒钛铁铬等多金属共伴生，其中攀西地区高铬型钒钛磁铁矿中铬储量巨大。钒渣高温钠化焙烧方法是我国钒钛磁铁矿提钒的主要方法，但因钒渣中钒、铬尖晶石矿相结构稳定，且受限于高温焙烧的反应传质障碍，造成钒回收率低，铬无法回收。本项目提出活性炭催化氧化亚熔盐介质低温高效分解含铬钒渣的新方法，重点围绕活性炭催化氧化钒渣分解作用机理及强化氧化钒渣分解规律、活性炭的分离及循环回用机制等关键科学问题，查明活性炭催化氧化钒渣分解的作用机制及调控规律，并基于活性炭有效回收及循环回用，建立碱性介质中活性炭催化氧化含铬钒渣分解的新理论、新方法，实现钒、铬的低温高效提取。本项目可为提高我国钒钛磁铁矿资源综合利用水平，特别是为我国36亿吨高铬型钒钛磁铁矿开发利用提供理论依据，还可望形成活性炭催化氧化碱介质分解两性金属矿物湿法冶金共性平台技术。

钒钛磁铁矿是我国重大特色多金属矿产资源，钒钛铁铬等多金属共伴生，其中攀西地区高铬型钒钛磁铁矿中铬储量巨大。钒渣高温钠化焙烧方法是我国钒钛磁铁矿提钒的主要方法，但因钒渣中钒、铬尖晶石矿相结构稳定，且受限于高温焙烧的反应传质障碍，造成钒回收率低，铬无法回收。本项目提出活性炭催化氧化亚熔盐介质低温高效分解含铬钒渣的新方法，重点围绕活性炭催化氧化钒渣分解作用机理及强化氧化钒渣分解规律、活性炭的分离及循环回用机制等关键科学问题，查明活性炭催化氧化钒渣分解的作用机制及调控规律，并基于活性炭有效回收及循环回用，建立了碱性介质中活性炭催化氧化含铬钒渣分解的新理论、新方法，实现了钒、铬的低温高效提取。本项目可为提高我国钒钛磁铁矿资源综合利用水平，特别是为我国36亿吨高铬型钒钛磁铁矿开发利用提供理论依据，还可望形成活性炭催化氧化碱介质分解两性金属矿物湿法冶金共性平台技术。