CaO-BaO-MgO-Al2O3 quaternary slag system tundish covering agent and preparation method thereof

A cao-bao-mgo-al2o3, quaternary slag technology, applied in the field of metallurgical auxiliary materials, can solve problems such as locking, limited plug rod adjustment, reduced steel quality, etc., to solve the problem of waste reuse, reduce product costs, The effect of improving the thermal insulation effect

Pending Publication Date: 2022-04-12
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the carbon-free, low-silicon and high-alkalinity slag-based covering agent widely used in China is mainly composed of CaO-Al 2 o 3 The binary slag system is the main one. Although the slag system has a certain adsorption and inclusion effect, due to the high melting point of the binary slag system covering agent, it is easy to sinter and crust on the slag surface in the actual use process, resulting in stopper rods The adjustment is limited, and the stopper rod will be "locked" in severe cases, resulting in interruption of continuous casting production
In order to reduce the melting point of the slag system, improve the melting characteristics, and avoid excessive sintering, it is often necessary to add a large amount of fluorite, sodium carbonate, sodium fluoride, etc. 2 O, F flux materials, and the added ones contain Na 2 Flux materials such as O and F have erosive effects on the tundish refractory material, reducing the service life of the tundish refractory material. At the same time, the eroded refractory material particles enter the molten steel and pollute the molten steel, increasing the inclusion content of the molten steel and reducing the steel. Quality, which has a great adverse effect on the production of high-quality clean steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] Preparation of barium aluminate powder:

[0039] Put barium carbonate and alumina powder into the electric arc furnace at a mass ratio of 2:1 and heat up to 1500°C±20°C to make it completely melted into a liquid state, pour it out and cool it to room temperature, and crush it until the particle size is ≤50mm Lumpy, processed by ball mill to 100 mesh powder with passing rate ≥ 95%.

Embodiment 1

[0041] Weigh 10 parts by weight of magnesia powder, 69 parts by weight of calcium slag powder, 16 parts by weight of barium aluminate powder, 2 parts by weight of regenerated cryolite powder and 3 parts by weight of binder, place them in a pulping tank, add water and stir, raw materials and The mass ratio of water is 1:0.7, and the stirring is strictly controlled for 45 minutes to prepare the mixed slurry; the mixed slurry is pressurized by the plunger pump to 1.8Mpa and enters the spray drying tower; the temperature inside the spray drying tower is set to 800 °C, and the The wind temperature is 200°C, and spray granulation is carried out; the spray granulation particles with a particle size of 20 to 80 meshes are screened out to prepare the tundish covering agent; the chemical composition of the tundish covering agent is sampled and tested, calculated as : SiO 2 1.48%, CaO 38.14%, MgO 10.93%, BaO 11.95%, Al 2 o 3 32.81%, Na 2 O0.66%, F0.77%, H 2 O 0.27%, the balance is ...

Embodiment 2

[0045] Take by weighing 17 parts by weight of magnesia powder, 52 parts by weight of calcium slag powder, 26 parts by weight of barium aluminate powder, 2.5 parts by weight of regenerated cryolite powder and 2.5 parts by weight of binder, place them in a pulping tank, add water and stir, raw materials and The mass ratio of water is 1:0.6, and the stirring is strictly controlled for 30 minutes to prepare the mixed slurry; the mixed slurry is pressurized by the plunger pump to 1.5Mpa and enters the spray drying tower; the temperature inside the spray drying tower is set at 600°C, and the The wind temperature is 150°C, and spray granulation is carried out; the spray granulation particles with a particle size of 20 to 80 meshes are screened out to prepare the tundish covering agent; the chemical composition of the tundish covering agent is sampled and tested, calculated as : SiO 2 1.21%, CaO 28.60%, MgO 17.19%, BaO 16.38%, Al 2 o 3 30.48%, Na 2 O1.10%, F1.28%, H 2 O 0.29%, t...

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Abstract

The invention provides a CaO-BaO-MgO-Al2O3 quaternary slag system tundish covering agent and a preparation method of the CaO-BaO-MgO-Al2O3 quaternary slag system tundish covering agent, and belongs to the technical field of metallurgical auxiliary materials. The CaO-BaO-MgO-Al2O3 quaternary slag system tundish covering agent is prepared from the following raw materials in parts by weight: 8 to 25 parts of magnesia powder, 37 to 69 parts of calcium slag powder, 16 to 41 parts of barium aluminate powder, 1 to 3 parts of regenerated cryolite powder and 1.5 to 3 parts of binder. Based on reasonable selection and scientific proportioning of the raw materials, the obtained covering agent has good inclusion adsorption capacity and excellent slag melting effect; material selection does not corrode the ladle lining, and the problems of sintering, crusting and the like are avoided; and the phenomena of molten steel pollution caused by recarburization, silicon increase and the like are avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgical auxiliary materials, in particular to a CaO-BaO-MgO-Al 2 o 3 A quaternary slag-based tundish covering agent and a preparation method thereof. Background technique [0002] At present, the carbon-free, low-silicon and high-alkalinity slag-based covering agent widely used in China is mainly composed of CaO-Al 2 o 3 The binary slag system is the main one. Although the slag system has a certain adsorption and inclusion effect, due to the high melting point of the binary slag system covering agent, it is easy to sinter and crust on the slag surface in the actual use process, resulting in stopper rods The adjustment is limited, and in severe cases, the stopper rod will be "locked", resulting in interruption of continuous casting production. In order to reduce the melting point of the slag system, improve the melting characteristics, and avoid excessive sintering, it is often necessary to add a...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B22D11/111
CPCY02P10/20
Inventor陈守杰罗志刚高金星王勇源冯岩
OwnerHENAN TONGYU METALLURGY MATERIALS GRP