从含铌铁矿中提铌及制铌铁的新方法

A NEW METHOD ON THE EXTRACTION OF Nb FROMNbBEARING IRON ORE FOR MAKING FeNb

针对我国包头现有高炉—转炉—电炉—电炉提铌工艺存在流程长、成本高、铌损失率大且只能生产含铌１３％～１５％铌铁的情况，提出包头铌资源选冶新思路：用ＣＯ－ＣＯ２混合气体选择性热还原含铌铁矿，９０％以上的铁矿物被还原为金属铁，铌矿物不被还原。磁选分离被还原的金属铁和其他矿物，得到含Ｎｂ２Ｏ５为６．９１％的含铌氧化物，其品位较原矿富集了４倍。然后用盐酸浸洗上述含铌氧化物，９０％以上的铁矿物、磷矿物以及ＣａＯ和ＭｇＯ进入浸液，铌儿乎全部留在浸渣中，得到的浸渣含Ｎｂ２Ｏ５近３０％，Ｎｂ／Ｆｅ＝６，Ｎｂ／Ｐ＝１２，此浸渣可用于冶炼符合工业标准的铌铁（含６０％～６５％Ｎｂ）。

Due to the fact that the existing procedure for extraction of Nb from the Nbbearing complex iron ore has disadvantages such as long route,low recovery,high cost and low grade of FeNb(13 %15 %Nb) produced,a new method has been proposed now.At first,the iron oxides from the Nbbearing iron ore are reduced by selective reduction with CO/CO2 with a reduction rate of 90 % keeping the Nb oxide intact.The reduced metallic iron is then separated from the Nbbearing residue by magnetic method and the Nbbearing residue containing 691 % Nb2O5 are obtained.The Nb2O5 content in the residue is 4 times of that in the original iron ore.90 % of the residual iron oxides,phosphorousbearing mineral,CaO and MgO in the Nbbearing residue are then removed by leaching with HCl and almost all of the Nb remains in the residue.The obtained residue contains 296 % Nb2O5 with Nb/Fe=6 and Nb/P=12.This residue can be used to make FeNb of commerical grade of 60 %65 %Nb.