# US 4,398,876 A · Hot-briquetting apparatus for reduced iron

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- Number: US 4,398,876 A
- Document ID: US4398876A
- Status: Granted
- Kind: A
- Application number: 06/253,142
- Filed: 1981-04-10
- Granted: 1983-08-16
- Earliest claimed: 1980-04-24
- Assignees: Mitsubishi Jukogyo Kabushiki Kaisha
- Inventors: Kimiaki Ohtawa; Hiroyoshi Takahashi; Yasuo Fukada
- Web page: https://patentgrep.com/patent/US4398876A

## CPC

- C22B 1/24: Binding; Briquetting {; Granulating}
- B22F 3/004: {Filling molds with powder (feeding material to presses in general B30B15/302)}
- B30B 15/308: {in a continuous manner, e.g. for roller presses, screw extrusion presses}
- C21B 13/0086: {Conditioning, transformation of reduced iron ores}
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)}
- C21B: MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B1/00)

## Abstract

The present invention relates to a hot briquetting apparatus for producing reduced iron briquettes comprising a container for receiving high temperature reduced iron; a storage tank connected to and located underneath the container for storing reduced iron and a hot briquetting machine located at a bottom opening of the storage tank. The improvement involves a means for charging residual reduced iron powder, carbon or mixtures thereof as well as an inert gas into the storage tank, said charge means connected to the storage tank and penetrating into the storage tank so that it is attached in a fluid-tight manner; said powder, carbon, inert gas, etc., being funneled into the storage tank in specific proportions in response to control means which are activated by a temperature sensor in contact with the reduced iron within the storage tank.

## Claims

### Claim 1

In a hot-briquetting apparatus for producing reduced iron briquettes which comprises a container for receiving high temperature reduced iron; a storage tank connected to said container with an opening at the upper end to receive said reduced iron from said container and which storage tank has an opening at the lower end thereof; a briquetting machine located at the bottom opening of said storage tank and means located at a lower portion of said storage tank for forcibly feeding the reduced iron into the briquetting machine; the improvement which comprises charging means connected to the storage tank below said upper opening for introducing (1) residual high temperature reduced iron produced from the briquetting of the reduced iron with the briquetting machine; (2) carbon or (3) mixtures of said residual reduced iron produced from the briquetting machine and carbon; and which charging means includes means for introducing an inert gas into said charging means, and a hopper, connected to said charging means, for receiving the iron produced from the briquetting machine; carbon or mixtures of said reduced iron or carbon as set forth in (1), (2) or (3) above; said charging means being driven by a drive motor whose rotation is controlled by a control means, said control means being activated by means for detecting the temperature of the reduced iron, said temperature detecting means being located in said storage tank, wherein said charging means connected to said storage tank penetrates through a wall of the storage tank so that the connection between the charging means and the storage tank is fluid tight.

### Claim 2 (depends on 1)

An apparatus according to claim 1, wherein the charging means is a screw feeder.

### Claim 3 (depends on 1)

An apparatus according to claim 1 wherein the charging means contains an opening for introducing the inert gas located next to the hopper.