Boron-containing fluorine-free fluxing slag-melting agent for electric steelmaking

An electric furnace steelmaking and slag agent technology, which is applied in the field of iron and steel smelting, can solve problems such as high cost, fluorine pollution, and furnace lining erosion, and achieve the effects of low cost, reduced erosion, and reduced slagging cost

Inactive Publication Date: 2011-05-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a fluxing slag agent suitable for the electric furnace steelmaking process, which solves many problems such as fluorine pollution, high cost, and serious corrosion of the furnace lining that exist in the current use of fluorite, calcium aluminate and iron oxide as fluxes. ,

Method used

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  • Boron-containing fluorine-free fluxing slag-melting agent for electric steelmaking
  • Boron-containing fluorine-free fluxing slag-melting agent for electric steelmaking
  • Boron-containing fluorine-free fluxing slag-melting agent for electric steelmaking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Ingredients: boron mud powder 50Kg, bauxite 25Kg, lime powder 20Kg, iron oxide 5Kg.

[0046] Preparation process: Mix the materials well, press the balls with a ball press machine, dry at 150°C, sinter at 600°C, sieve and pack the finished product after cooling. The main composition index of the product is shown in Table 2, and the main performance index is shown in Table 3.

Embodiment 2

[0048] Ingredients: Boron mud powder 50Kg, bauxite 20Kg, lime powder 20Kg, iron oxide 10Kg.

[0049] Preparation process: Mix the materials well, press the balls with a ball press machine, dry at 150°C, sinter at 600°C, sieve and pack the finished product after cooling. The main composition index of the product is shown in Table 2, and the main performance index is shown in Table 3.

Embodiment 3

[0051] Ingredients: boron mud powder 50Kg, bauxite 20Kg, lime powder 25Kg, iron oxide 5Kg.

[0052] Preparation process: Mix the materials well, press the balls with a ball press machine, dry at 150°C, sinter at 600°C, sieve and pack the finished product after cooling. The main composition index of the product is shown in Table 2, and the main performance index is shown in Table 3.

[0053] Second set of examples

[0054] The selected raw materials are as follows:

[0055] The technical index of boron mud powder is (mass%): B 2 o 3 4.5%;

[0056] The technical index of ferrite is (mass%): Al 2 o 3 50%, Fe 2 o 3 20%, SiO 2 10%, S≤0.10%, P≤0.08%;

[0057] The technical indicators of quicklime are (mass%): CaO 90%, SiO 2 2.0%, S≤0.035%, P≤0.015%;

[0058] The technical index of iron oxide is (mass%): Fe 2 o 3 90%.

[0059] Preparation before batching: fully dry and dehydrate the boron mud powder, ferrite, lime powder and iron oxide at 200°C, grind them into f...

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Abstract

The invention provides a boron-containing fluorine-free fluxing slag-melting agent for electric steelmaking, belonging to the technical field of steelmaking. The slag-melting agent is made from the following components in parts of by weight: 30-50 parts of boron sludge, 20-40 parts of laterite, 20-40 parts of quicklime and 5-15 parts of ferric oxide. The preparation method of the slag-melting agent comprises the following steps: sufficiently drying and dehydrating the raw materials, and weighting and proportioning based on weight parts; and grinding, evenly mixing, and making block slag by a pelleting-drying-sintering method or premelting-cooling-crushing-sieving method. Compared with the prior art, the invention has the following beneficial effects: the product provided by the invention is used as the fluxing agent instead of fluorite, calcium aluminate and ferriferous oxide, thereby eliminating fluorine pollution and relieving the corrosion action of the slag-melting agent on the furnace lining; and particularly, the waste boron sludge are recycled, and high-cost calcium aluminate is replaced with low-cost laterite with abundant reserves, thus the boron-containing fluorine-free fluxing slag-melting agent provided by the invention has important meanings for reasonably and comprehensively utilizing mineral resources, lowering the steelmaking cost, and realizing high-efficiency low-cost low-pollution green steelmaking.

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 boron-containing and fluorine-free fluxing slag agent for electric furnace steelmaking. Background technique [0002] In the field of electric furnace steelmaking, in order to save electric energy and achieve high-efficiency smelting, it is required to make slag quickly 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 use of arc rate, reducing the cost of steelmaking. At present, electric furnace steelmaking mostly uses fluorite, calcium aluminate, iron oxide, etc. as fluxing slag agents. There are some disadvantages in these flux-melting slag agents. [0003] The main component of fluorite is CaF 2 , has a low melting point and has the characteristics of forming a low melting point eute...

Claims

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Application Information

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IPC IPC(8): C21C5/54
Inventor 王宏明李桂荣赵玉涛张廷旺闫永其
Owner JIANGSU UNIV
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