含钒钢渣添加SiO_2后的钒富集相与钒富集行为

Vanadium rich phases and vanadium concentration of vanadium bearing steel slag by addition of SiO_2

为含钒钢渣设计富钒相,使钢渣中的钒主要富集于所设计的富钒相中.中国马钢的钢渣和瑞典SSAB的钢渣是本研究使用的样本.尽管炉渣的来源和化学组成各不相同,但是可以发现其矿物组成大致相似,而且无法仅仅通过对炉渣的热处理来实现钒的富集.本文根据钒和炉渣的基本物理化学性质设计了两种适合于作为富钒相的矿物:溶有w(S i)<3%的3CaO.V2O5和3CaO.P2O5的固溶体以及另外一种w(S i)约10%的由3CaO.2S iO2,3CaO.V2O5和3CaO.P2O5的组成的矿物.通过添加S iO2对炉渣的化学成分进行调整,在炉渣中得到了所设计的富钒相,且炉渣中超过2/3的钒富集于其中.本研究为钢渣中的钒提出了一种新的回收利用途径.

Predominate vanadium in steel slags concentrated in Vanadium rich phases designed was focused in the present work. Samples were collected from Ma Steel, China and SSAB, Sweden. Despite of the composition difference, slags from both factories showed similar mineral constitution after heat treatment, and no vanadium rich phase found inside. Two vanadium rich phases, a solid solution of 3CaO·V205 and 3CaO·P2O5 with less then 3% Si dissolved in and another mineral with higher Si content, were designed as the candidate of vanadium rich phases. Added SiO2 into slags, both two designed vanadium rich phases were observed in samples, and more then two third of vanadium in slag was concentrated in the phases. The present finding suggest a new way for vanadium recovery from steel slags.