Boron-containing modifier for ladle covering slag and use method thereof

A modifier, covering slag technology, applied in the field of metallurgy, can solve problems such as hazards

Active Publication Date: 2009-12-30
安徽盛博冶金环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of the existing ladle covering slag and its modifier, the present invention provides a ladle covering slag containing boron modifier and its use method, the purpose of which is to increase the basicity of the covering slag, reduce the oxidation and lower the melting point of the covering slag, and avoid CaF is used in the refining process 2 Corrosion and other hazards to furnace lining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] When using one-step method to smelt stainless steel, since the alloy and auxiliary materials are added to the converter, and the high-carbon ferrochrome contains silicon, it is necessary to increase the amount of lime, resulting in a large amount of slag from the converter. The shell is prone to slagging, which brings many adverse effects to the subsequent operations. Converter refining slag contains an average of 52.04wt% CaO, SiO 2 33.13wt%, MgO 7.3wt%, Fe 2 o 3 0.93%, MnO 0.019%, with CaO / SiO 2 Represents alkalinity, (FeO+MnO) represents oxidation, it can be seen that the slag has low basicity and high melting point.

[0016] Stainless steel is smelted according to the above method. After tapping, the boron-containing modifier is added to the liquid surface of the ladle. The dosage of the boron-containing modifier is 0.4kg / t of molten steel. After adding the boron-containing modifying agent, the weight content of boron in the smelted finished steel increases by...

Embodiment 2

[0021] For the use of CaF in refining slag and modifier 2 The slag system of the composition, due to the presence of aggravated lining erosion and CaF 2 Pollution problem, it is proposed to replace CaF with boron-containing modifier 2 Modifier.

[0022] The boron-containing modifier components used are CaO 28%, MgO 10%, B 2 o 3 40%, Al 2 o 3 1%, SiO 2 2%, Fe 2 o 3 1%, 2% Al, 0.5% impurity, 17.5% loss on ignition; the particle size is that the sieve residue after passing through a 50-mesh sieve accounts for less than 10% of the total weight of the boron-containing modifier, and the melting point is less than 1100°C.

[0023] According to the method described in Example 1, the boron-containing modifier was added to the molten steel surface, and the addition amount was 0.5 kg / t molten steel.

[0024] The analysis of the covering slag after adding the boron-containing modifier shows that the basicity and oxidative properties of the slag are suitable. After the treatme...

Embodiment 3

[0026] MgO-C furnace lining is used during refining. In order to avoid aggravated corrosion of the furnace lining and rapid slag formation, it is planned to increase the MgO content in the slag. The boron-containing modifier used is CaO 28%, MgO 12%, B 2 o 3 25%, Al 2 o 3 3%, SiO 2 10%, Al 1.5%, impurity 0.5%, ignition loss 20%; the particle size is that the sieve residue after passing through a 50-mesh sieve accounts for less than 10% of the total weight of the boron-containing modifier, and the melting point is less than 1100°C.

[0027]According to the method described in Example 1, the boron-containing modifier is added to the molten steel surface, and the addition amount is 0.6 kg / t molten steel.

[0028] After adding the boron-containing modifier, the slag alkalinity and MgO content are increased, slag is melted, slag is formed rapidly, and the slag refining capacity is improved. From the converter tapping to the LF furnace, there is no case where the ladle cannot...

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Abstract

The invention relates to a boron-containing modifier for ladle covering slag and a use method thereof. The modifier comprises the following components by weight percent: 20 to 30 percent of CaO, 4 to 12 percent of MgO, 25 to 44 percent of B2O3, 1 to 3 percent of Al2O3, 2 to 10 percent of SiO2, 0 to 1.5 percent of Fe2O3, 1 to 3 percent of Al, 0.5 to 1.5 percent of impurities and 10 to 20 percent of loss components on ignition. The use method comprises that the following steps: the boron-containing modifier is added to the ladle along with steel stream when tapping, or the boron-containing modifier is added to molten steel liquid level after tapping, and the use level of the boron-containing modifier is 0.4 to 0.6 kg/t molten steel. The invention uses the boron-containing modifier to replace CaF2-containing modifier, has fast action and fast scorification, achieves the purpose of enhancing refining speed and effect, and can avoid erosion of CaF2 to furnace brick lining and reduce environment pollution and damage to the human body at the same time.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a boron-containing modifier for ladle covering slag and a use method thereof. Background technique [0002] Ladle covering slag is mainly composed of converter refining slag flowing in during the tapping process and slag formed by alloy deoxidation products. Usually, there are problems such as large amount of slag, high oxidation, and low alkalinity, which reduce the deoxidation and desulfurization capabilities of molten steel and affect refining. At the same time, part of the covering slag still has high melting point, high viscosity, and easy crusting, which makes it difficult to charge electrodes and materials under the LF furnace, which in turn brings difficulties to slide plate handling, ladle turning and ladle turnover, and even affects the smooth production process. conduct. In addition, the refining slag of the converter traditionally contains more CaF 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 戴云阁谢启荣
Owner 安徽盛博冶金环保科技有限公司
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