Method for multi-step reduction of low grade nickel ore and concentration method in nickel recovery from low grade nickel ore using the same

摘要

The present invention relates to a multistage reduction method for a low-grade nickel ore and a method for concentrating and recovering nickel using the same, and more particularly, to a method for reducing nickel-containing raw material using a gas containing CO as a reducing gas, And a second reducing step of reducing the nickel-iron-containing raw material to hydrogen gas to produce a reducing raw material for leaching, wherein the multi-step reduction method of the low grade nickel ore; And a method for efficiently concentrating and recovering nickel, including the same. The multi-step reduction method of the present invention uses a gas containing CO and a hydrogen gas to perform a two-stage reduction step. Further, the hydrogen is supplied to the process cost So that an efficient process can be performed. According to the present invention, since the reducing process is performed in multiple stages, it is possible to reduce the variation of the reducing raw material due to unevenness of the raw material quality by controlling the two-step process.