# US 4,400,206 A · Process for estimating particle size segregation of burden layer in blast furnace top

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- Number: US 4,400,206 A
- Document ID: US4400206A
- Status: Granted
- Kind: A
- Application number: 06/268,016
- Filed: 1981-05-28
- Granted: 1983-08-23
- Earliest claimed: 1981-05-28
- Assignees: Kawasaki Steel Corporation
- Inventors: Mikio Kondo
- Web page: https://patentgrep.com/patent/US4400206A

## CPC

- C21B 5/008: {Composition or distribution of the charge}
- C21B: MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B1/00)

## Abstract

A process for estimating a particle size segregation in a burden layer at a blast furnace top is disclosed, which comprises measuring a particle size distribution of a burden material before the charging and a layer thickness distribution of the burden layer after the charging, and estimating a particle size distribution at every position in the burden layer charged at the furnace top on the basis of the above measured values, charging conditions and furnace operating conditions according to a simulation model of particle size segregation.

## Claims

### Claim 1

A process for estimating a particle size segregation in a burden lyer stacked upwardly in a blast furnace, which comprises measuring a particle size distribution of a burden material before charging the burden material into the furnace to form a burden layer therein and measuring a layer thickness distribution of said burden layer after the charging of the burden material into the furnace, and estimating a particle size distribution at every position in said burden layer on the basis of said measured values, charging conditions and furnace operating conditions according to a simulation model of particle size segregation given by the following equation: ##EQU4## wherein X.sub.n is a cumulative weight fraction of particles having smaller size than n-th sieve opening, .alpha. is a particle size segregation constant, and l is a distance from a collision point of main falling trajectory against burden surface, to the flowing direction.