# US 4,395,280 A · Preheating process for steel-making materials

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- Number: US 4,395,280 A
- Document ID: US4395280A
- Status: Granted
- Kind: A
- Application number: 06/237,768
- Filed: 1981-02-24
- Granted: 1983-07-26
- Earliest claimed: 1980-02-29
- Assignees: Daidotokushuko Kabushikikaisha
- Inventors: Akira Takenouchi; Yukio Niwa
- Web page: https://patentgrep.com/patent/US4395280A

## CPC

- F27D 13/002: {Preheating scrap}
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE

## Abstract

A preheating process for steel-making materials, in which the steel-making materials are preheated in a preheating furnace and transferred to a bucket in a clean state for charging them into the steel-making furnace by scattering any dust sticking to the materials by dumping them into the bucket and collecting the scattered dust.

## Claims

### Claim 1

A preheating process for steelmaking materials, which comprises the steps of:
(a) preheating steel making materials by contacting said materials with waste gas fluid containing dust from a steel-making furance in a preheating furnace, some of said dust sticking to said materials.
(b) scattering any dust sticking to the heated steel-making materials by impact of dumping the materials,
(c) collecting the scattered dust, and
(d) charging the steel-making materials into the steel-making furnace after collecting the dust.

### Claim 2 (depends on 1)

A preheating process for steel-making materials as set forth in claim 1, wherein the step of scattering any dust sticking to the heated steel-making materials is done by dumping the materials into a bucket.

### Claim 3 (depends on 1, 2)

A preheating process for steel-making materials as set forth in claim 1 or 2, the step of charging steel-making materials into the steel-making furnace after collecting the scattered dust is done by a bucket.