Method for producing pellets and method for producing iron-nickel alloy

Patent metadata

Field	Value
Publication number	US-2017211166-A1
Application number	US-201515328692-A
Country	US
Kind code	A1
Filing date	Jun 30, 2015
Priority date	Aug 1, 2014
Publication date	Jul 27, 2017
Grant date	—

Abstract

Provided is a method for producing pellets by which, when nickel oxide ore is being pelletized and smelted to produce ferronickel, which is an iron-nickel alloy, it is possible to allow the smelting reaction to proceed effectively. A method for producing pellets according to the present invention is for producing pellets which are used in producing iron-nickel alloy and which are produced by mixing raw materials including nickel oxide ore and agglomerating the resulting mixture, wherein the method comprises: a mixing step S 11 for mixing at least nickel oxide ore, a carbonaceous reducing agent, and iron oxide to generate a mixture; and a pellet formation step S 12 for agglomerating the resulting mixture and forming pellets. In the mixing step S 11 , the mixture is generated such that the total weight of nickel and iron accounts for 30 wt % or more of the total weight of the pellets formed.

First claim

1 . A method for producing pellets to be used for producing an iron-nickel alloy, and produced by agglomerating a mixture obtained by mixing raw materials including nickel oxide ore, the method comprising:
a mixing process step of generating a mixture by mixing at least the nickel oxide ore, a carbonaceous reducing agent and iron oxide; and a pellet formation step of forming a pellet by agglomerating the mixture obtained, wherein the nickel oxide ore is limonite or saprolite, wherein the iron oxide is hematite obtained by wet smelting of iron ore or nickel oxide ore having an iron quality of at least 50 wt %, and wherein a mixture is generated in the mixing process step such that a proportion of a sum weight of nickel and iron accounting for the total weight of the pellet formed is at least 30 wt %.

2 . The method for producing pellets according to claim 1 ,
wherein a mixture is generated in the mixing process step such that a proportion of a sum weight of nickel and iron accounting for the total weight of the pellet formed is no more than 45 wt %.

3 . A method for producing an iron-nickel alloy that produces the iron-nickel alloy from nickel oxide ore, the method comprising:
a pellet production step of producing a pellet from the nickel oxide ore; and a reduction step of heating the pellet obtained at a predetermined reduction temperature, wherein the pellet production step includes: a mixing process step of generating a mixture by mixing at least the nickel oxide ore, a carbonaceous reducing agent and iron oxide; and a pellet formation step of forming a pellet by agglomerating the mixture obtained, wherein the nickel oxide ore is limonite or saprolite, wherein the iron oxide is hematite obtained by wet smelting of iron ore or nickel oxide ore having an iron quality of at least 50 wt %, and wherein a mixture is generated in the mixing process step such that a proportion of a sum weight of nickel and iron accounting for the total weight of the pellet formed is at least 30 wt %.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Takahashi Junichi
• Inoue Taku
• Okada Shuuji

Classifications

• C22B23/02 Primary

  by dry processes · CPC title

• C21B11/00

  Making pig-iron other than in blast furnaces · CPC title

• B22F9/20

  starting from solid metal compounds · CPC title

• C21B13/00

  Making spongy iron or liquid steel, by direct processes · CPC title

• C22C33/02

  by powder metallurgy · CPC title