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Fluoride-free slagging flux for electric-arc furnace steelmaking

An electric arc furnace and slag making technology, applied in the field of iron and steel smelting, can solve the problems of slow slagging speed, poor slagging effect, and large amount of dust, and achieve the effects of fast slagging speed, fast melting speed and improving the life of furnace lining

Inactive Publication Date: 2012-11-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a fluorine-free slagging flux suitable for electric arc furnace steelmaking, which solves the problems of slow slagging speed and slagging effect of lime, fluorite, calcium aluminate and iron oxide as slagging materials. Poor, fluorine pollution, high cost, serious lining erosion, large amount of dust and many other problems

Method used

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  • Fluoride-free slagging flux for electric-arc furnace steelmaking
  • Fluoride-free slagging flux for electric-arc furnace steelmaking
  • Fluoride-free slagging flux for electric-arc furnace steelmaking

Examples

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Comparison scheme
Effect test

Embodiment 1

[0050] Ingredients: Spodumene 20Kg, Bauxite 20Kg, Active Lime 50Kg, Iron Oxide 5Kg, Magnesia 5Kg.

[0051] Preparation process: Mix the materials well, press the balls with a ball press, dry at 150°C, sinter at 600°C, sieve and pack the finished product after cooling; see Table 2 for the main composition indexes of the product, and see Table 2 for the main performance indexes table 3.

Embodiment 2

[0053] Ingredients: 40Kg of spodumene, 15Kg of bauxite, 30Kg of active lime, 10Kg of iron oxide, 5Kg of magnesia.

[0054] Preparation process: Mix the materials well, press the balls with a ball press, dry at 150°C, sinter at 600°C, sieve and pack the finished product after cooling; see Table 2 for the main composition indexes of the product, and see Table 2 for the main performance indexes table 3.

Embodiment 3

[0056] Ingredients: Spodumene 35Kg, Bauxite 15Kg, Active Lime 30Kg, Iron Oxide 10Kg, Magnesia 10Kg.

[0057] Preparation process: Mix the materials well, press the balls with a ball press, dry at 150°C, sinter at 600°C, sieve and pack the finished product after cooling; see Table 2 for the main composition indexes of the product, and see Table 2 for the main performance indexes table 3.

[0058] Second set of examples

[0059] The raw materials used in this group of examples are the same as those in the first group of examples. The difference is that this group of examples is prepared by pre-melting, that is, the raw materials are fully dried first, and then the ingredients are weighed according to the weight ratio and ground to below 3mm. Mix evenly, and then pre-melt, cool, crush and sieve to make finished products in sequence, and the particle size range of the finished products is 1-30mm.

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Abstract

The invention belongs to the technical field of iron and steel smelting and particularly relates to a fluoride-free slagging flux for the electric-arc furnace steelmaking and a preparation method thereof. The invention aims to provide the fluoride-free slagging flux for the electric-arc furnace steelmaking and the preparation method thereof and solve various problems of low slagging speed, poor slag melting effect, fluorine pollution, high cost, serious corrosion of a furnace lining, large dust capacity and the like which are generated due to the case that currently, lime, fluorite, calcium aluminate and iron oxide are used as slags. The fluoride-free slagging flux is characterized by being prepared from the following raw materials in percentage by weight: 20 to 40 percent of spodumene, 15 to 20 percent of red bauxite, 30 to 50 percent of active lime, 5 to 10 percent of iron oxide and 5 to 10 percent of magnesia.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a preparation method of a fluorine-free slagging agent for electric arc furnace steelmaking. Background technique [0002] In the field of electric arc furnace steelmaking, in order to save electric energy and achieve high-efficiency smelting, it is required to quickly make slag and ensure the foaming of slag, so that it can not only realize early dephosphorization in smelting, but also realize arc submerged operation of foam slag, improve smelting efficiency and arc safety Utilization rate, reduce steelmaking cost; At present, lime is mostly used as slagging flux in electric arc furnace steelmaking, supplemented by fluorite, calcium aluminate, iron oxide, etc. Deficiencies: [0003] 1) The melting speed of lime is slow [0004] Lime melting is the prerequisite for rapid slagging, realizing early dephosphorization in smelting, improving smelting effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/54
Inventor 王宏明李桂荣赵玉涛
Owner JIANGSU UNIV
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