Method and apparatus for treating iron-contained raw material using bath smelting furnace

Patent metadata

Field	Value
Publication number	US-2018087120-A1
Application number	US-201715716582-A
Country	US
Kind code	A1
Filing date	Sep 27, 2017
Priority date	Sep 28, 2016
Publication date	Mar 29, 2018
Grant date	—

Abstract

The present invention relates to method and apparatus for treating iron-contained raw material using bath smelting furnace. An iron-contained raw material is mixed with a reducing agent. The mixture is added into a bath smelting furnace. The enriched oxygen is blown into the bath. The smelt is conducted at a temperature of 1200-1600° C. Compared with the traditional process of “sintering/pellet-blast furnace smelting” or “rotary furnace reduction-electrical furnace smelting separation”, the present invention has the remarkable advantages of short process, strong raw material adaptability, high product quality, low energy consumption, low pollution, etc. The present invention provides a new technology direction for effectively and comprehensively utilizing the iron-contained resource and has a wide application prospect.

First claim

What is claimed is:

1 . A method for treating iron-contained raw material using bath smelting furnace, comprising:
mixing an iron-contained raw material with a reducing agent to form a mixture; adding the mixture into a bath smelting furnace; blowing enriched oxygen into the bath; and smelting at a temperature of 1200-1600° C.

2 . The method of claim 1 , further comprising, adding an additive to the iron-contained raw material and the reducing agent to form the mixture; and
adding the mixture into the bath smelting furnace for smelting; wherein the smelting time is 0.5-4 hours.

3 . The method of claim 2 , wherein, a mass ratio of the iron-contained raw material, the additive, and the reducing agent is 100:(0-60):(20-60).

4 . The method of claim 2 , wherein, the additive is one or more items selected from the group consisting of sodium carbonate, sodium sulfate, sodium chloride, sodium borate, sodium hydrogen carbonate, limestone, and dolomite.

5 . The method of claim 1 , wherein,
the reducing agent is one or more items selected from the group consisting of anthracite, bitumite, a lignite, and a coke; and the mass ratio of the iron-contained raw material to the reducing agent is 100:(20-60).

6 . The method of claim 1 , wherein, the iron-contained raw material comprises TFe, V 2 O 5 , and TiO 2 ; wherein a mass fraction of TFe is 30%-65%, a mass fraction of V 2 O 5 is 0%-2.0%, and a mass fraction of TiO 2 is 0%-35%.

7 . The method of claim 1 , wherein, an oxygen volume concentration of the enriched oxygen is 40%-80%.
a molar ratio of oxygen atom in the enriched oxygen to carbon atom in the reducing agent is 0.4-1.0.

8 . A bath smelting furnace apparatus for treating iron-contained raw material, comprising:
an enriched oxygen tuyere arranged 0.3-0.6 m lower than a bath surface and on a sidewall of the bath;
wherein, an iron-contained raw material is mixed with a reducing agent to form a mixture;
the mixture is added into the bath smelting furnace apparatus;
enriched oxygen is blown into the bath; and
smelting is performed at a temperature of 1200-1600° C.

9 . The bath smelting furnace apparatus of claim 8 , wherein, a hearth is arranged 0.8-1.2 m lower than the enriched oxygen tuyere.

10 . The bath smelting furnace apparatus of claim 8 , further comprising:
a steel water jacket, positioned at an upper portion of the bath furnace; a copper water jacket, positioned at a middle portion the bath furnace; and the hearth, positioned at a bottom portion of the bath furnace; wherein at least one of the copper water jacket and the steel water jacket is provided with a feed inlet; the steel water jacket is provided with a smoke outlet; a lower portion of the copper water jacket is provided with an enriched oxygen tuyere; an upper portion of the copper water jacket is provided with a secondary tuyere; the steel water jacket is provided with a tertiary tuyere; and a side wall of the hearth is provided with a slag outlet and a metal outlet.

11 . The method of claim 3 , wherein, the additive is one or more items selected from the group consisting of sodium carbonate, sodium sulfate, sodium chloride, sodium borate, sodium hydrogen carbonate, limestone, and dolomite.

12 . The method of claim 2 , wherein,
the reducing agent is one or more items selected from the group consisting of anthracite, bitumite, a lignite, and a coke; and the mass ratio of the iron-contained raw material to the reducing agent is 100:(20-60).

13 . The method of claim 6 , wherein, an oxygen volume concentration of the enriched oxygen is 40%-80%.
a molar ratio of oxygen atom in the enriched oxygen to carbon atom in the reducing agent is 0.4-1.0.

14 . The bath smelting furnace apparatus of claim 9 , further comprising:
a steel water jacket, positioned at an upper portion of the bath furnace; a copper water jacket, positioned at a middle portion the bath furnace; and the hearth, positioned at a bottom portion of the bath furnace; wherein at least one of the copper water jacket and the steel water jacket is provided with a feed inlet; the steel water jacket is provided with a smoke outlet; a lower portion of the copper water jacket is provided with an enriched oxygen tuyere; an upper portion of the copper water jacket is provided with a secondary tuyere; the steel water jacket is provided with a tertiary tuyere; and a side wall of the hearth is provided with a slag outlet and a metal outlet.

15 . The bath smelting furnace apparatus of claim 8 , wherein,
an additive is added to the iron-contained raw material and the reducing agent to form the mixture; and the mixture is added into the bath smelting furnace for smelting; wherein the smelting time is 0.5-4 hours.

16 . The bath smelting furnace apparatus of claim 15 , wherein, a mass ratio of the iron-contained raw material, the additive, and the reducing agent is 100:(0-60):(20-60).

17 . The bath smelting furnace apparatus of claim 15 , wherein, the additive is one or more items selected from the group consisting of sodium carbonate, sodium sulfate, sodium chloride, sodium borate, sodium hydrogen carbonate, limestone, and dolomite.

18 . The bath smelting furnace apparatus of claim 16 , wherein, the additive is one or more items selected from the group consisting of sodium carbonate, sodium sulfate, sodium chloride, sodium borate, sodium hydrogen carbonate, limestone, and dolomite.

19 . The bath smelting furnace apparatus of claim 8 , wherein,
the reducing agent is one or more items selected from the group consisting of anthracite, bitumite, a lignite, and a coke; and the mass ratio of the iron-contained raw material to the reducing agent is 100:(20-60).

20 . The bath smelting furnace apparatus of claim 15 , wherein,
the reducing agent is one or more items selected from the group consisting of anthracite, bitumite, a lignite, and a coke; and the mass ratio of the iron-contained raw material to the reducing agent is 100:(20-60).

21 . The bath smelting furnace apparatus of claim 8 , wherein,
the iron-contained raw material comprises TFe, V 2 O 5 , and TiO 2 ; wherein a mass fraction of TFe is 30%-65%, a mass fraction of V 2 O 5 is 0%-2.0%, and a mass fraction of TiO 2 is 0%-35%.

22 . The bath smelting furnace apparatus of claim 8 , wherein,
an oxygen volume concentration of the enriched oxygen is 40%-80%.
a molar ratio of oxygen atom in the enriched oxygen to carbon atom in the reducing agent is 0.4-1.0.

23 . The bath smelting furnace apparatus of claim 21 , wherein,
an oxygen volume concentration of the enriched oxygen is 40%-80%.
a molar ratio of oxygen atom in the enriched oxygen to carbon atom in the reducing agent is 0.4-1.0.

Assignees

• Inst Process Eng Cas

Inventors

• Qi Tao
• Yi Lingyun
• Chen Desheng
• Wang Lina
• Zhao Hongxin
• Liu Yahui
• Wang Weijing
• Yu Hongdong

Classifications

• C21B13/006

  Starting from ores containing non ferrous metallic oxides · CPC title

• F27D3/16

  Introducing a fluid jet or current into the charge (F27D3/18 takes precedence) · CPC title

• F27D2003/164

  Oxygen · CPC title

• C21B13/0006 Primary

  obtaining iron or steel in a molten state · CPC title

• C21B13/0013

  introduction of iron oxide into a bath of molten iron containing a carbon reductant · CPC title