Fluoride-free environmental-friendly slag dilution solvent for electric furnace, converter and medium frequency furnace and preparation method of fluoride-free environmental-friendly slag dilution solvent

An environmentally friendly, intermediate frequency furnace technology, applied in the direction of improving process efficiency, can solve the problems of difficult to control smelting operation, weak calcium fluoride thin slag effect, short duration, etc., achieve good metallurgical environmental protection effect, reduce drying and drying The effect of splashing and improving the service life

Active Publication Date: 2012-10-24
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the thin slag flux added in the ordinary smelting process is mainly composed of a single fluorite. As a fluxing material, although this material can accelerate the dilution of slag, long-term use will greatly erode the furnace lining and affect the service life of the refractory material. Under the action of calcium fluoride, it will produce gas to pollute the environment, which will cause great harm to equipment and the environment, because the following reactions will occur under high temperature of calcium fluoride: (CaF 2 )+(H 2 O)=(CaO)+2(HF); 2(CaF 2 )+(SiO 2 )=2(CaO)+(SiF 4 ); (CaF 2 )+(MgO)=(CaO)+(MgF 2 ); 3 (CaF 2 ) + (Al 2 o 3 )=3(CaO)+2(AlF 3 ); 5 (CaF 2 ) + (V 2 o 5 )=5(CaO)+2(VF 5 )
[0004] Due to the existence of the above reaction, although calcium fluoride has a strong effect of thinning slag, it is unstable in the slag, and the effect in the early stage is quite different from the effect in the later stage.
Especially in the later stage, the thin slag effect of calcium fluoride gradually weakens, and the duration is short, and the metallurgical effect is unstable, making it difficult to control the smelting operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 15 parts of quicklime (100 mesh), 23 parts of iron concentrate powder (100 mesh), 55 parts of bauxite (100 mesh), and 7 parts of lightly burned magnesia (100 mesh). Stir evenly, press into a spherical shape with a diameter of 40mm, and then melt in a high-temperature furnace. The mass percentage of each index after melting is as follows: Al 2 o 3 :48.25%, Fe 2 o 3 :20.4%, CaO:13.75%, MgO:6.65%, SiO 2 : 5.60% (with elements attached to the material), grind the prepared product to 100 mesh fine powder and add (calculated according to the percentage of the total product content) borax 3%, soda ash 3%, stir evenly, inspect the package, and product indicators For: Al 2 o 3 :45.35%, Fe 2 o 3 :19.17%, CaO:12.92%, MgO:6.25%, SiO 2 :5.26%, B 2 o 3 +Na 2 O: 3.64%. This product has been tested for stainless steel smelting in Shanghai Baosteel's 50-ton intermediate frequency furnace. The steel consumption per ton is 1Kg. The slag melting, spreadability and fluidity...

Embodiment 2

[0020] Take 10 parts of quicklime (100 mesh), 20 parts of iron concentrate powder (100 mesh), 60 parts of bauxite (100 mesh), 10 parts of light burnt magnesia (100 mesh), measure all kinds of materials accurately, and then stir Uniform, pressed into a spherical shape with a diameter of 40mm, and then melted in a high-temperature furnace. The mass percentage of each index after melting is as follows: Al 2 o 3 :52.50%, Fe 2 o 3 :17.68%, CaO:9.20%, MgO:9.17%, SiO 2 : 5.82% (with elements attached to the material), grind the prepared product to 100 mesh fine powder and add (calculated according to the percentage of the total product content) borax 2%, soda ash 4%, stir evenly and press it into a 10-50mm spherical shape, Packed after sieving. The mass percentage content of each index of the product is as follows: Al 2 o 3 :49.35%, Fe 2 o 3 :16.61%, CaO:8.64%, MgO:8.61%, SiO 2 :5.47%, B 2 o 3 +Na 2 O: 3.54%, H 2 O: 0.25%. This product is used as an alternative to the 1...

Embodiment 3

[0022] Take 8 parts of quicklime (100 mesh), 18 parts of iron concentrate powder (100 mesh), 65 parts of bauxite (100 mesh), 9 parts of light burnt magnesia (100 mesh), and measure all kinds of materials accurately, then stir Uniform, pressed into a spherical shape with a diameter of 40mm, and then melted in a high-temperature furnace. The mass percentage of each index after melting is as follows: Al 2 o 3 :55.65, Fe 2 o 3 :15.28, CaO:7.33, MgO:8.26, SiO 2 : 6.53 (with elements attached to the material), grind the prepared product to 100 mesh fine powder, add (calculated according to the percentage of the total product content) 4% borax, 2% soda ash, stir evenly and dry press into a 10-50mm spherical shape , packed after sub-sieving. The mass percentage content of each index of the product is as follows: Al 2 o 3 :52.31%, Fe 2 o 3 :14.36%, CaO:6.89%, MgO:7.76%, SiO 2 :6.14%, B 2 o 3 +Na 2 O:3.90%, H 2 O: 0.25%. This product was tested on a 150-ton converter in Ta...

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Abstract

The invention discloses a fluoride-free environmental-friendly slag dilution solvent for an electric furnace, a converter and a medium frequency furnace and a preparation method of the fluoride-free environmental-friendly slag dilution solvent. The fluoride-free environmental-friendly slag dilution solvent comprises the following components by mass: 5-20 percent of CaO, 30-70 percent of Al2O3, 10-30 percent of Fe2O3, 5-20 percent of MgO, 1-5 percent of borax and 1-5 percent of soda ash, wherein the borax and the soda ash are taken as additives. Compared with traditional slag dilution solvents, particularly when being used for smelting a special alloy steel grade, due to the characteristics of low melting point, good mobility, small surface tension and the like of the slag of the special alloy steel grade, the fluoride-free environmental-friendly slag dilution solvent ensures that slag has stronger capability of adsorbing rare metal oxide of vanadium oxide, titanium oxide, titanium nitride and the like in molten steel and supplies powerful guarantee for increasing the molten steel purity of the special alloy steel and reducing steel billet inclusion in subsequent continuous casting.

Description

technical field [0001] The invention belongs to the technical field of fluxing materials for slag making and smelting, in particular to a fluorine-free and environment-friendly thin slag solvent used in electric furnaces, converters and intermediate frequency furnaces. technical background [0002] Thin slag solvent is similar to slag melting flux. It is a fluxing material for slag making smelting. It can help melting when used in intermediate frequency furnace, and at the same time, it can achieve the effect of diluting alloy and oxidizing slag. The main metallurgical effects of using this product are: rapid slagging, shortening smelting time, reducing the consumption of slagging materials and smelting costs; reducing the melting point of slagging materials, increasing the fluidity of slag, reducing the interfacial tension of slag steel, and achieving adsorption and assimilation of harmful substances in steel. The effect of inclusions; speed up the melting speed of slag-for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 王庆来王庆德武金波张国令李秀峰罗志刚李党军朱云峰唐红波
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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