Freon-free environment-friendly continuous casting slag

A continuous casting mold slag and mold slag technology, which is applied in the metallurgical field, can solve the problems of equipment maintenance costs increase, increase, and increase the burden of sewage discharge, etc., and achieve the effects of improving treatment and discharge pressure, reducing rust and corrosion

Inactive Publication Date: 2011-08-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase of fluoride ion concentration and pH value in the secondary cooling water greatly accelerates the corrosion rate of continuous casting equipment and increases equipment maintenance costs; at the same time, it increases the difficulty of circulating water treatment and the cost of neutralizers; in addition, it also increases the cost of sewage discharge burden
Although the patent CN03117824.3 uses perovskite (CaO·TiO 2 ) to replace the lance spar to achieve the purpose of crystallization, and achieve F-free, but the titanium-containing mold flux is easy to produce surface slag inclusions, which is not conducive to the surface quality of the billet, so the F-free mold flux cannot be used industrially in batches

Method used

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  • Freon-free environment-friendly continuous casting slag
  • Freon-free environment-friendly continuous casting slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A non-F environment-friendly continuous casting mold flux, its chemical composition is: CaO: 41%, SiO 2 : 34%, Al 2 o 3 : 4%, MgO: 6%, Na 2 O: 8%, B 2 o 3 : 3.5%, C: 1.5%, and the rest are trace impurities brought by the raw materials, the slag CaO / SiO 2 (Alkalinity) is 1.2, the viscosity at 1300°C is 0.4Pa.s, the melting temperature is 1185°C, and the crystallization rate is 90%.

[0028] The influence of the fluorine-free environment-friendly continuous casting mold flux on the pH value of the secondary cooling water in this example is shown in figure 1 ,From figure 1 The results show that compared with the fluorine-containing slag, the fluorine-free slag will not cause the pH value of the secondary cooling water to decrease, and the corrosion degree of the equipment will be greatly reduced. In addition, after using fluorine-free slag, the enrichment of fluoride in the secondary cooling water no longer occurs ( figure 2 ).

Embodiment 2

[0030] A non-F environment-friendly continuous casting mold flux, its chemical composition is: CaO: 36.5%, SiO 2 : 25%, Al 2 o 3 : 7%, MgO: 11%, Na 2 O: 6%, B 2 o 3 : 8.5%, Li 2 O: 2%, C: 2%, and the rest are trace impurities brought by raw materials. The slag has a basicity of 1.46, a viscosity of 0.32 Pa.s at 1300°C, a melting temperature of 1210°C, and a crystallization rate of 82%.

Embodiment 3

[0032] A non-F environment-friendly continuous casting mold flux, its chemical composition is: CaO: 33%, SiO 2 : 29%, Al 2 o 3 : 3%, MgO: 8%, Na 2 O: 12%, B 2 o 3 : 5%, C: 5%, and the rest are trace impurities brought by raw materials. The slag has a basicity of 1.14, a viscosity of 0.35 Pa.s at 1300°C, a solidification temperature of 1120°C, and a crystallization rate of 20%.

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Abstract

The invention provides a freon-free environment-friendly continuous casting slag which comprises the following ingredients by the weight percentage of 3 to 15 percent of Na2O, 3 to 12 percent of MgO, less than 8 percent of Al2O3, 2 to 9 percent of B2O3, 1 to 15 percent of C and the balance of CaO and SiO2, wherein the CaO and SiO2 account for 1.1 to 1.5 percent; and the sum of Na2O and MgO in the casting slag is more than 10 percent; in addition, the freon-free environment-friendly continuous casting slag can also comprise Li2O which accounts for not more than 3 percent. The freon-free environment-friendly continuous casting slag uses merwinite and miserite instead of cuspidine, is free of Freon, and has a value in environment protection and reduction of corrosion of equipments and much higher than the slight increase of raw material cost. The casting slag can be used industrially in batch.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a continuous casting mold flux used in a continuous casting process. Background technique [0002] Continuous casting mold flux is a powdery or small granular steelmaking auxiliary material used to cover the surface of molten steel in the mold of a continuous casting machine. It has multiple functions such as thermal insulation, preventing oxidation of molten steel, absorbing inclusions, lubricating and controlling heat transfer, etc. It is the last process technology in the steelmaking process to control the quality of the final product-casting slab. Unsuitable mold slag performance will cause casting slabs Surface defects such as slag inclusions and cracks will occur, and even cause steel breakout accidents in serious cases. Therefore, mold flux is an important means to ensure the continuous casting process and the surface quality of the slab. [0003] Usually mold flux is CaO, SiO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 张晨蔡得祥
Owner BAOSHAN IRON & STEEL CO LTD
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