Title:
SMELTING REDUCTION METHOD FOR NI ORE
Document Type and Number:
Japanese Patent JP3119015
Kind Code:
B2
Abstract:
PURPOSE: To provide the smelting reduction method for Ni ore which executes stable operation without spitting and slopping occurring in a bottom blowing gas by overcoming the problem of wear of furnace body bricks.
CONSTITUTION: This smelting reduction method for the Ni ore with a converter smelting furnace 10 having a top blowing oxygen lance 21 and bottom blowing 24 and/or side blowing tuyeres consists of a series of smelting reduction stages including (1) a stage for charging the Ni ore together with carbonaceous materials into the smelting furnace 10, (2) a stage for blowing oxygen from the top blowing oxygen lance into the smelting furnace 10 and (3) a stage for blowing a stirring gas, such as N2 or CO, from the bottom blowing 24 and/or side blowing tuyeres into the smelting furnace 10 to stir the materials and consists in maintaining the secondary combustion ratio expressed by formula (H2O+CO2)/(H2+H2O+CO+CO2) to <0.3. The method also consists in adjusting the temp. of slag t ≤1580°C, maintaining the T.Fe in slag at ≤110wt.% and controlling the flow rate of the stirring gas from the bottom blowing and/or side blowing tuyeres to 0.1 to 1.0Nm3/min ton.
Inventors:
Jiro Tanabe
Chihiro Taki
Atsushi Watanabe
Hideaki Mizukami
Hideo Nakamura
Chihiro Taki
Atsushi Watanabe
Hideaki Mizukami
Hideo Nakamura
Application Number:
JP6974893A
Publication Date:
December 18, 2000
Filing Date:
March 29, 1993
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
C22B23/02; (IPC1-7): C22B23/02
Domestic Patent References:
| JP6036613A | ||||
| JP1162712A | ||||
| JP2221336A | ||||
| JP2274824A |
Attorney, Agent or Firm:
Muneharu Sasaki (3 outside)