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Method for making steel by using dephosphorized steel slag

A steel slag and dephosphorization technology, applied in the field of metallurgy, can solve the problems of reduced dephosphorization efficiency of converters, late slagging time, insufficient heat, etc.

Pending Publication Date: 2021-07-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

[0002] In order to reduce the consumption of auxiliary materials in converter smelting, most converter steelmaking enterprises adopt the operation of "retaining slag". With the continuous accumulation of furnaces leaving slag, the phosphorus content in steel slag is getting higher and higher, resulting in a decrease in dephosphorization efficiency of converters
At the same time, Panzhihua Iron and Steel uses vanadium-titanium magnetite for smelting. The main raw material for converter steelmaking is semi-steel after vanadium extraction in a special converter. ~4.0%, the content of silicon and manganese heating elements in semi-steel are all traces, so semi-steel smelting has the characteristics of late slagging time, poor dephosphorization effect, and insufficient heat

Method used

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Examples

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Embodiment 1

[0080] A 120t converter in a factory adopts semi-steel slag smelting. When the phosphorus content of the final steel slag is 1.1wt%, all slag is left after tapping and 2kg of graphite per ton of steel is added to the furnace. The top-blown oxygen lance blows nitrogen into the furnace to supply gas. Strength is 2.5m 3 / t min, the position of the oxygen lance is between 0.5 and 1.0m; the bottom blowing nitrogen, the gas supply intensity is 0.08m 3 / t min, the top nitrogen blowing time is 3min, the slag after nitrogen blowing ends stays in the furnace, the slag quality is 6% of semi-steel quality, and blends into semi-steel (phosphorus content is 0.09wt%) in the furnace for use Oxygen blowing with oxygen lance, the oxygen supply strength of oxygen lance is 2.5m 3 / t min, control slag alkalinity 1.6; bottom blow nitrogen, gas supply intensity is 0.08m 3 / t·min, when the temperature is 1400°C, the phosphorus-rich slag is poured out; after the slag is poured out, secondary slag fo...

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Abstract

The invention provides a method for making steel by using dephosphorized steel slag. The method comprises the following steps: dephosphorizing steel slag to obtain the dephosphorized steel slag; and making steel by using the dephosphorized steel slag. The invention provides the method for making steel by dephosphorizing and recycling the converter steel slag in order to solve the problems that the converter dephosphorizing efficiency is reduced and the consumption of auxiliary materials is increased due to continuous accumulation of phosphorus in the steel slag caused by slag remaining operation of a converter. On the basis of existing slag remaining operation, the consumption of the auxiliary materials is further reduced, the converter dephosphorization efficiency is improved, meanwhile, the problem that a semisteel smelting heat source is insufficient can be relieved, the TFe content of final slag is reduced, and the remarkable cost reduction and emission reduction effects are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steelmaking method using dephosphorized steel slag, more specifically a steelmaking method for dephosphorizing and reusing converter steel slag for semi-steel smelting. Background technique [0002] In order to reduce the consumption of auxiliary materials in converter smelting, most converter steelmaking enterprises adopt the operation of "retaining slag". As the number of slag remaining furnaces continues to accumulate, the phosphorus content in steel slag is getting higher and higher, resulting in a decrease in the dephosphorization efficiency of the converter. At the same time, Panzhihua Iron and Steel uses vanadium-titanium magnetite for smelting. The main raw material for converter steelmaking is semi-steel after vanadium extraction in a special converter. ~4.0%, the content of silicon and manganese in the semi-steel is trace, so the smelting of semi-steel ...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/36C21C7/064
CPCC21C5/28C21C5/36C21C7/064
Inventor 陈均梁新腾曾建华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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