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Synthetic slag for smelting low-silicon steel

A technology of synthetic slag and low-silicon steel, which is applied in the direction of improving process efficiency, can solve problems such as excessive synthetic slag content, ladle sticky slag, low-silicon steel content exceeding the standard, and achieve the effect of avoiding ladle sticky slag

Inactive Publication Date: 2009-11-18
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of synthetic slag for smelting low-silicon steel, which mainly solves the problem of existing synthetic slag SiO 2 and CaF 2 Excessive silicon content leads to technical problems in low-silicon steel due to excessive silicon content and sticky slag in the ladle
Control moisture ≤0.3%

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0006] Synthetic slag is composed of active lime, pre-melted slag, fluorite and aluminum chips, and its weight percentage is: active lime 55-70%, pre-melted slag 15-25%, fluorite 5-10%, aluminum chips 8-15% %. The technical requirements of each component are as follows:

[0007] Active lime: CaO≮90%, P≯0.04%, S≯0.04%, the lime must be batched and packaged on the day it leaves the kiln, and it does not exceed three days from the time it leaves the kiln to the delivery to the manufacturer. When it arrives at the site for use, the lime is active The volume is not less than 350ml.

[0008] Fluorite: CaF 2 ≮90%, SiO 2 ≯3%, P≤0.02%, S≤0.02%.

[0009] Aluminum scrap: Al>98%, particle size less than 20mm.

[0010] Pre-melted slag: The main component of pre-melted slag is calcium aluminate (CaO-Al 2 o 3 ), in order to ensure purity and uniformity, the production method must be produced by electric melting, and the particle size of the produced pre-melted slag is required to be l...

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Abstract

The invention relates to a synthetic residue for steel smelt and low silicon steel smelt and desulfurization, which dissolves the technique problem of high synthetic residue SO2 and CaF2 content leading to overproof of low silicon steel content and ladle sticking slag. The technical project of the invention is the synthetic residue for low silicon steel smelt, the chemical composition of which is 58-70% CaO, 5-12% Al2O3, 8-15% Al, 5-10% CaF2, less than 3% SiO2, less than 1. 5% FeO, less than 1. 0% TiO2, less than 0. 05% P, less than 0. 5% S, not more than 0. 06% C, not more than 0. 3% water retaining capacity . The invention is used for low silicon steel smelt.

Description

Technical field: [0001] The invention relates to a synthetic slag used for iron and steel smelting, in particular to a synthetic slag used for desulfurization of low silicon steel smelting. Background technique: [0002] With the increasingly stringent requirements of users on steel quality, ladle refining is developing rapidly as a method of producing high-quality steel. The method of refining molten steel outside the furnace using synthetic slag and solid slagging agent has been widely used. The development and application of synthetic slag is in the ladle or ladle furnace under the condition of high sulfur and oxygen content in the primary molten steel. Desulfurization, degassing and removal of non-metallic inclusions are carried out on molten steel so that it can meet the quality requirements of steel grades. At present, there are many types of synthetic slag, which do have certain effects in desulfurization, removal and adsorption of inclusions, and its components most...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 韩乃川洪建国占东平虞大俊邹俊苏唐洪乐张才贵倪修华
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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