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Melted iron dephosphorization agent using vessel slag as raw material

A technology of water dephosphorization agent and converter slag, applied in the field of pyrometallurgy, can solve the problems of slow slag formation, unfavorable environmental protection, soil pollution, etc., and achieves the reduction of splash occurrence rate, which is beneficial to environmental protection and reduces production. cost effect

Inactive Publication Date: 2004-09-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The initial slagging speed is relatively slow, and splashing is prone to occur during the injection treatment;
[0007] (2) The dephosphorization agent generally contains 6-15% fluorite, which has serious erosion on refractory materials, and the fluoride in the dephosphorization slag pollutes the soil, which is not conducive to environmental protection;
[0008] (3) The cost of dephosphorization agent is high;
[0009] (4) The free CaO in the final slag of dephosphorization is relatively high, which is not conducive to the comprehensive utilization of dephosphorization slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1 The composition of the molten iron dephosphorization agent is shown in Table 1. In a 250kg induction furnace, 100kg of molten iron is charged, powder spraying treatment is carried out at 1400°C, and N 2 Gas or Ar gas; injection pressure 0.2 ~ 0.3Mpa, gas flow 0.4 ~ 0.5Nm 3 / h, powder injection speed 200 ~ 800g / min, injection 4kg molten iron dephosphorization agent.

[0046] The molten iron dephosphorization agent in Example 1 of the present invention is compared with Comparative Example, and the results are shown in Table 3.

[0047] Ingredients before processing (%)

Embodiment 2

[0049] Example 2 The composition of the molten iron dephosphorization agent is shown in Table 1. In a 250kg induction furnace, 100kg of molten iron is charged, powder spraying treatment is carried out at 1350°C, and N 2 Gas or Ar gas; injection pressure 0.2 ~ 0.3Mpa, gas flow 0.4 ~ 0.5Nm 3 / h, powder injection speed 200 ~ 800g / min, injection 4kg dephosphorization agent.

[0050] The molten iron dephosphorization agent of this embodiment is compared with conventional dephosphorization agents, and the results are shown in Table 4.

[0051] Ingredients before processing %

Embodiment 3

[0053] Example 3 The composition of the molten iron dephosphorization agent is shown in Table 1. Hot metal pretreatment is carried out in 320-ton torpedo tanks, and the temperature range of hot metal pre-dephosphorization is 1300-1400 °C;

[0054] The molten iron dephosphorization agent of this embodiment is compared with conventional dephosphorization agents, and the results are shown in Table 5.

[0055] time

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PUM

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Abstract

A molten iron dephosphorization agent using furnace slag as raw material comprising the constituents of (wt%) furnace slag 20-50, calcarea lime 15-28, ferrum oxide 20-43, fluorite 0-3, soda 0-3, lime stone 0-3. The furnace slag proportion amounts 20-50%, the ferrum oxide can be sintered ore or rolled steel iron sheet, or can be revolving furnace smoke or sintered dedusting ash. The invention realizes reduced production costs, saved lime and low fusing point.

Description

technical field [0001] The invention relates to the technical field of pyrometallurgy, in particular to the powder spraying dephosphorization pretreatment of molten iron in torpedo pots or ladles. Background technique [0002] Phosphorus is a harmful element in most steel grades. In recent years, with the rapid development of science and technology, users' requirements for steel quality have been continuously improved. For example, for low-temperature steel, marine steel, hydrogen-induced cracking-resistant steel and steel for some thick plates, in addition to requiring extremely low sulfur content, the phosphorus content in steel is also required to be <0.01% or 0.005%. In addition, in order to reduce the production cost of oxygen converter steel and implement less slag steelmaking, the phosphorus content of molten iron is also required to be less than 0.015%. Therefore, since the 1980s, many metallurgical workers have devoted themselves to the research on the "three r...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 陈兆平
Owner BAOSHAN IRON & STEEL CO LTD
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