Method for adjusting chemical composition of molten pig iron tapped from blast furnace
US4601749A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1985 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | Sep 4, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27B1/21
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
At least one lance is substantially vertically arranged above a hot-metal runner of a blast furnace so that the lowermost end of the lance is spaced apart by a prescribed distance from the surface of molten pig iron flowing through the hot-metal runner. A granular chemical composition adjusting agent for adjusting the chemical composition of molten pig iron is blown, through the lance, into molten pig iron by means of a carrier gas to adjust the chemical composition of molten pig iron so as to satisfy the following two equations: EQU 0.5H.ltoreq.H.sub.p <H (1) EQU H.sub.p =M.multidot.G.multidot.exp(-r)/(D+0.02H.sub.L).sup.2 (2) In equations (1) and (2): PA1 H: depth of molten pig iron in the hot-metal runner (mm), PA1 H.sub.p : penetration depth of the granular chemical composition adjusting agent into molten pig iron in the hot-metal runner (mm), PA1 M: flow rate of the granular chemical composition adjusting agent (kg/minute), PA1 G: flow rate of the carrier gas (Nm.sup.3 /minute), PA1 r: average particle size of the granular chemical composition adjusting agent (mm), PA1 D: inside diameter of the lance (mm), and PA1 H.sub.L : distance between the surface of molten pig iron in th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.