KR-20260066915-A - Resource recycling materials for depressing furnace slag foaming including sodium sulphate, and manufacturing method thereof

Abstract

The present invention relates to a resource recycling converter slag calming agent comprising sodium sulfate and a method for manufacturing the same. More specifically, the invention relates to an improved resource recycling converter slag calming agent that allows for more efficient calming of converter slag while recycling resources by manufacturing a slag calming agent based on sodium sulfate generated during Li extraction in a secondary battery manufacturing process and using it when the slag in the slag pot is first removed after the first blowing of the converter.

Inventors

• 최규현

Assignees

• 티아이솔텍 주식회사

Dates

Publication Date

20260512

Application Date

20241105

Claims (6)

1. An eco-friendly converter slag stabilizer containing sodium sulfate, comprising 70 to 90 parts by weight of a steelmaking byproduct containing one or more of converter slag, ladle slag, electric furnace slag, coke sludge, CDQ (Coke Dry Quenching) dust, and limestone sludge, and 3 to 8 parts by weight of a binder, per 100 parts by weight of sodium sulfate.
2. In paragraph 1, An eco-friendly converter slag stabilizer containing sodium sulfate, characterized in that the above-mentioned sodium sulfate is a byproduct of sodium sulfate generated during Li extraction in a secondary battery manufacturing process.
3. In paragraph 2, An eco-friendly converter slag stabilizer containing sodium sulfate, characterized in that the above-mentioned sodium sulfate byproduct contains 0 to 60 weight percent of soda ash.
4. In paragraph 1, An eco-friendly converter slag stabilizer containing sodium sulfate, characterized in that the binder is at least one selected from the group consisting of molasses binder, bentonite, aluminum dross, water glass, and cement.
5. In paragraph 5, An eco-friendly converter slag stabilizer containing sodium sulfate, characterized by a compressive strength of 70 to 100 kg/ cm² based on 3 days of curing.
6. A first step of preparing a mixed raw material by mixing 70 to 90 parts by weight of a steelmaking byproduct containing one or more of converter slag, ladle slag, electric furnace slag, coke sludge, CDQ (Coke Dry Quenching) dust, and limestone sludge, and 3 to 8 parts by weight of a binder, with respect to 100 parts by weight of sodium sulfate; A second step of pressure molding the above mixed raw materials; and A third step of drying and curing the above-mentioned pressure-molded mixed raw material; A method for manufacturing an eco-friendly converter slag stabilizer containing sodium sulfate, characterized by including:

Description

Resource recycling converter slag foaming including sodium sulfate and manufacturing method thereof The present invention relates to a resource recycling converter slag calming agent comprising sodium sulfate and a method for manufacturing the same. More specifically, the invention relates to an improved resource recycling converter slag calming agent that allows for more efficient calming of converter slag while recycling resources by manufacturing a slag calming agent based on sodium sulfate generated during Li extraction in a secondary battery manufacturing process and using it when the slag in the slag pot is first removed after the first blowing of the converter. Generally, the steelmaking process is a process of adjusting the carbon content of molten iron produced in a blast furnace to change it into a desired composition. In the steelmaking process, the double slag method is adopted, and after primary blowing, the concentrated slag is first discharged into a slag pot for the purpose of removing P₂O₅ . At this time, a large amount of slag foaming occurs, and even while excluding the slag, the slag overflows out of the slag pot due to CO bubbles, causing environmental pollution and production disruptions. In addition, the reality is that there are areas for improvement in terms of cost, such as instability of the slag's composition and the use of expensive slag stabilizers. Figure 1 is a schematic diagram showing the converter cycle process for the converter double slag method. Figure 2 is a photograph of a slag decontamination agent according to the present invention. Before describing the preferred embodiments of the present invention in detail below, it should be noted that the terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Throughout this specification, when a part is described as "comprising" a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Hereinafter, embodiments of the present invention are examined. However, the scope of the present invention is not limited to the following preferred embodiments, and those skilled in the art may implement various modified forms of the contents described herein within the scope of the present invention. First, the eco-friendly converter slag stabilizer containing sodium sulfate according to the present invention comprises, for every 100 parts by weight of sodium sulfate, 70 to 90 parts by weight of a steelmaking byproduct containing one or more of converter slag, ladle slag, electric furnace slag, coke sludge, CDQ (Coke Dry Quenching) dust, and limestone sludge, and 3 to 8 parts by weight of a binder. The main component of sodium sulfate is Na₂SO₄, and it ultimately exists as Na₂O in the slag through the following reaction. Na₂SO₄→Na₂O + SO₃ Here, Na₂O lowers the melting point and viscosity of the slag, thereby increasing fluidity, which increases the rate of bubble extinction. Additionally, the generated gas provides a passage for new bubbles within the slag layer, increasing the escape rate of the bubbles. As a result, slag foaming can be quickly and effectively contained. In other words, the melting point and viscosity of the slag are reduced by the Na component contained in the sodium chloride, which creates a large number of holes or channels in the slag and allows bubbles to be discharged through them, thereby reducing the volume of the slag and causing it to settle. At this time, the sodium sulfate used in the present invention is characterized as a byproduct generated during the extraction of Li in the secondary battery manufacturing process. The components of a secondary battery are broadly composed of a cathode material, a negative electrode material, an electrolyte, and a separator. The raw materials constituting the cathode material include Ni, Co, Mn, and Li, and sodium sulfate is produced as a byproduct when Li is produced. The above-mentioned sodium sulfate byproduct is classified as general waste and has conventionally been disposed of by landfilling; however, this material is a substance in which problems such as disposal costs and landfill sites are intensifying. In the present invention, by recycling this sodium sulfate, the above-mentioned problems can be solved, and at the same time, cost reduction and slag settling in the steelmaking process can be efficiently achieved. When waste sodium bicarbonate or sintered desulfurization dust is used as a base, sodium sulfate contains Na2SO4, Na2CO3, and NaCl, but the sodium sulfate byproduct generated during Li extraction used in the present invention contains only Na2SO4 and a small amount of water. In other words, when using sodium sulfate produced during the secondary battery manufacturing proce