JPH0613251Y2 - Iron ore fluidized bed reduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fluidized bed reduction apparatus for ore.

[Prior Art] In order to reduce iron ore to produce hot metal, a method of using a blast furnace, a method of melting iron ore reduced in a shaft furnace in an electric furnace, and the like have been conventionally used.

The smelting reduction method has been attracting attention as an alternative to such conventional hot metal production technology. The smelting reduction furnace used in this method was developed for the purpose of producing a molten iron-based alloy by a smaller-scale facility without being restricted by the raw material used.

The present inventors previously proposed one of such smelting reduction methods in Japanese Patent Laid-Open No. 61-64807.

In such a smelting reduction method, as is clear from the development process, the range of usable raw materials is expanded, and the reduction efficiency is improved. There is.

[Problems to be solved by the invention] By the way, the reduction ore supplied to the smelting reduction furnace is injection-supplied with carrier gas up to 1 mmφ
Exceeding φ is supplied from above.

However, in the circulating fluidized bed, since fine particles and coarse particles circulate in a mixed state, it was difficult to separate them according to particle size.

The present invention provides an iron ore fluidized bed reduction apparatus for recovering reduced ores by particle size.

[Means for Solving the Problems] The present invention relates to a device for producing reduced ore, in which a raw material hopper and a discharge port are provided in a fluidized bed reduction furnace, an external particle circulation device is attached, and an external particle circulation device is provided with a pre-stage coarse particle A separator and a post-stage solid-gas separator are provided, each separator is provided with a discharge port via a pneumatic feeder, and each separator is connected to a fluidized bed reduction furnace via a discharge pipe. It is a device.

The present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view of the present invention. In the figure, a fluidized bed reduction furnace 15 has a raw material hopper 16 and a discharge port 30, and is provided with a reducing gas injection nozzle 18. Reference numeral 17 is a cutoff valve.

The external particle circulation device 11 of the present invention is provided with a pre-stage coarse / fine separator (hereinafter referred to as a pre-stage cyclone) 20 and a post-stage solid gas separator (hereinafter referred to as a post-stage cyclone) 21.

Each cyclone is provided with outlets 31 and 32 through pneumatic feeders 25 and 26, respectively.

The apparatus 10 for producing reduced ore of the present invention is constituted by the above, but the raw ore supplied from the raw material hopper 16 forms a fluidized bed in the fluidized bed reduction furnace 15 under the injection of reducing gas to carry out the reduction reaction. Receive The reduced ore is introduced from the reduction furnace together with the exhaust gas into the preceding cyclone 20, while the coarse-grained ore is recovered from the discharge port 30 through the valve 17 in an appropriate amount.

The coarse particles that have been coarsely separated by the pre-stage cyclone 20 are recovered from the outlet 31 via the pneumatic feeder 25, and the fine particles are introduced into the post-stage cyclone 21 together with the gas, further classified, and completely solidified. , Pneumatic feeder
It is recovered from the outlet 32 via 26.

FIG. 2 shows an example of the pneumatic feeder 25.

The conduit 41 of the preceding cyclone 20 is introduced into the discharge pipe 40 via the retention area 44 and the conduit 42. Reference numeral 43 indicates a split bender, and reducing gas is injected from the gas system 18. Coarse particles are collected from the upstream side of the conduit 41 through a conduit (not shown) to the pneumatic feeder.
25 is recovered and collected.

Pneumatic feeder installed in the rear cyclone 21
26 is not particularly shown, but the pneumatic feeder 25
Can be the same as.

[Advantage of the Invention] In the present invention, an external particle circulation device is attached to the fluidized bed reduction furnace, and a front stage micron and a latter stage cyclone are provided as external particle circulation devices. It is possible to separately collect coarse ores from the former cyclone and fine ores from the latter cyclone as reduced ores, respectively.

Therefore, it is possible to supply the reduction ore of an appropriate grain size to the smelting reduction furnace, and its practical value is great.

[Brief description of drawings]

FIG. 1 is an explanatory view of the present invention, and FIG. 2 is a partial explanatory view of the present invention. 10 ... Reduced ore manufacturing equipment 11 ... External particle circulation equipment, 15 ... Fluidized bed reduction furnace 20 ... Pre-stage cyclone, 21 ... Post-stage cyclone

Claims (1)

[Scope of utility model registration request] In an apparatus for producing reduced ore, a fluidized bed reduction furnace is provided with a raw material hopper and a discharge port, an external particle circulation device is attached, and the external particle circulation device is provided with a pre-stage coarse / fine separator and a post-stage solid gas separator. An iron ore fluidized bed reduction apparatus, wherein each separator is provided with a discharge port via a pneumatic feeder, and each separator is connected to a fluidized bed reduction furnace via a discharge pipe.