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Fluoride-free covering slag used for high-aluminum steel continuous casting crystallization device

A technology of mold slag and high aluminum steel, which is applied in the field of iron and steel smelting and continuous casting, can solve the problems of workers' health damage, water pollution, equipment corrosion, etc., and achieve the effect of reasonable component matching, avoiding pollution and improving lubrication effect

Active Publication Date: 2017-10-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fluorine-containing mold flux will cause the following three problems in the continuous casting process: 1) Fluorine will react during the melting process of the mold flux to form harmful fluorides with low melting points (HF, SiF 4 , NaF, etc.), causing corrosion of equipment and damage to the health of workers; 2) In contact with cold water during the cycle, fluorine will be released into the water, causing the water sample to be acidic, causing water pollution and equipment corrosion; 3) Fluorine will also be released into the soil during the stacking of waste residue after use, causing soil and groundwater pollution

Method used

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  • Fluoride-free covering slag used for high-aluminum steel continuous casting crystallization device
  • Fluoride-free covering slag used for high-aluminum steel continuous casting crystallization device
  • Fluoride-free covering slag used for high-aluminum steel continuous casting crystallization device

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Experimental program
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Effect test

Embodiment 1

[0042] Ingredients: ternary alkalinity CaO / (SiO 2 +Al 2 o 3 ) is 1.10, CaO 41.90wt.%, SiO 2 10wt.%, Al 2 o 3 28.10wt.%, MgO 2wt.%, Na 2 O 10wt.%, Li 2 O 2wt.%, B 2 o 3 6wt.%.

[0043] Preparation process: Weigh the above-mentioned mold slag raw materials according to the target components, and perform mechanical stirring to make the components evenly mixed, and then use an intermediate frequency induction furnace to heat and melt the mixed samples to remove volatiles and gas substances, and form complex Solid solution, the molten slag is poured into water and quenched to obtain a glassy mold slag block, and the mold slag block is mechanically crushed and ground to obtain the required mold slag powder.

[0044] The main physical properties of mold flux are shown in Table 1.

Embodiment 2

[0046] Ingredients: ternary alkalinity CaO / (SiO 2 +Al 2 o 3 ) is 1.10, CaO 40.86wt.%, SiO 2 10wt.%, Al 2 o 3 27.14wt.%, MgO 2wt.%, Na 2 O 10wt.%, Li 2 O 2wt.%, B 2 o 3 8wt.%.

[0047] Preparation process: with embodiment 1.

[0048] The main physical properties of mold flux are shown in Table 1.

Embodiment 3

[0050] Ingredients: ternary alkalinity CaO / (SiO 2 +Al 2 o 3 ) is 1.10, CaO 39.81wt.%, SiO 2 10wt.%, Al 2 o 3 26.19wt.%, MgO 2wt.%, Na 2 O 10wt.%, Li 2 O 2wt.%, B 2 o 3 10 wt.%.

[0051] Preparation process: with embodiment 1.

[0052] The main physical properties of mold flux are shown in Table 1.

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Abstract

The invention relates to fluoride-free covering slag used for a high-aluminum steel continuous casting crystallization device. The covering slag is composed of, by mass, oxide components of 30-45% of CaO, 10-25% of SiO2, 20-35% of Al2O3, 2-10% of MgO, 4-10% of B2O3, 8-15% of Na2O+Li2O, CaO / (SiO2+Al2O3) larger than or equal to 1.1 but smaller than or equal to 1.3, CaO / B2O3 larger than or equal to 3.5 but smaller than or equal to 7 and SiO2 / B2O3 larger than or equal to 1 but smaller than or equal to 1.7. Scrap steel in the covering slag is low in reaction degree, crystallization performance is good, and the crystallization ore phase is mainly calcium borate silicate. The formed calcium borate silicate can fix SiO2 in covering slag melt, reaction between SiO2 and an Al element in steel is weakened from reaction kinetics, and the stability of the covering slag is greatly improved; the calcium borate silicate crystals can effectively control the heat-transfer effect of the covering slag.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to a high-aluminum steel fluorine-free protective slag with good physical and chemical properties. Background technique [0002] Continuous casting mold powder has many important functions in the continuous casting process, such as preventing oxidation, absorbing inclusions, lubricating the billet shell and controlling heat transfer, among which the functions of lubrication and heat transfer are the most important. The smooth progress of casting plays an important role. In the continuous casting process of high aluminum steel, Al in molten steel will enter into the mold flux in two different ways, one is absorbed into the mold flux in the form of non-metallic oxide inclusions, oxygen is preferentially combined with Al, Generate metal oxide inclusions; the other is through SiO in mold flux 2 The reaction occurs (4[Al]+3(SiO 2 )=2(Al 2 o 3 )+3[Si]) into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 王万林黄道远张磊朱晨阳李欢谢森林余杰
Owner CENT SOUTH UNIV
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