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Environment-friendly carbon-free dry material

A dry material and environmentally friendly technology, applied in the field of refractory materials, can solve the problems of harming the health of operators, reducing the quality of molten steel, polluting the environment, etc., achieving the effect of low erosion index, reducing carbon pollution, and improving cleanliness

Inactive Publication Date: 2020-07-03
秦皇岛市首耐新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing working lining materials cannot meet the above requirements well. Most of the existing working lining materials use phenolic resin as a binder, which contains a variety of harmful gases, such as volatiles such as ammonia and benzene, which pollute the environment and endanger operation. The health of the patient; and it will also produce the effect of increasing carbon and hydrogen, reducing the quality of molten steel

Method used

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  • Environment-friendly carbon-free dry material

Examples

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Effect test

preparation example Construction

[0021] The preparation process of above-mentioned sintered magnesia is as follows:

[0022] Take magnesite as the raw material, first use a common mill to grind the raw material to 200 mesh, put the ground raw material ore powder into the flotation tank for wet flotation purification, and obtain magnesite concentrate powder;

[0023] The above-mentioned magnesite concentrate powder is ultra-finely pulverized and ground by a stirring ball mill to obtain ultra-fine magnesite concentrate powder, which is then pressed into shape under a pressure of 400MPa;

[0024] Put the shaped ultra-fine magnesite concentrate into a rotary kiln, first calcinate at 1500°C for 1.5 hours, then raise the temperature to 2000°C for 2 hours, then lower the temperature to 1800°C and keep it for 5 hours to obtain sintered magnesia.

[0025] In the following examples, the above method was used to prepare sintered magnesia.

[0026] When using the above-mentioned carbon-free dry material, mix the ingredi...

Embodiment 1

[0028] An environment-friendly carbon-free dry material, including sintered magnesia, hydrated sodium metasilicate, hydrated magnesium sulfate and borides, each component is 95% by weight of sintered magnesia, hydrated sodium metasilicate is 1%, Magnesium sulfate hydrate is 2%, and boride is 2%.

[0029] Wherein the hydrated sodium metasilicate is taken from the mixture of sodium metasilicate nonahydrate, sodium metasilicate heptahydrate and sodium metasilicate pentahydrate with a molar ratio of 1:1; the magnesium sulfate hydrate is seven A mixture of magnesium sulfate hydrochloride and magnesium sulfate trihydrate, the molar ratio of the magnesium sulfate heptahydrate and magnesium sulfate trihydrate is 2:1; the boride is boric acid.

[0030] When using the above-mentioned carbon-free dry material, mix the ingredients first, and then spread the mixed dry material on the inner surface of the tundish (the specific method can be to spread the dry material on the bottom of the tu...

Embodiment 2

[0032] An environment-friendly carbon-free dry material, including sintered magnesia, hydrated sodium metasilicate, hydrated magnesium sulfate and borides, each component is 87% by weight of sintered magnesia, hydrated sodium metasilicate is 5%, Magnesium sulfate hydrate is 7%, and boride is 1%.

[0033] Wherein, the hydrated sodium metasilicate is obtained from a mixture of sodium metasilicate nonahydrate and sodium metasilicate pentahydrate at a molar ratio of 1:1; the magnesium sulfate hydrate is composed of magnesium sulfate heptahydrate and magnesium sulfate trihydrate The mixture of magnesium sulfate heptahydrate and magnesium sulfate trihydrate has a mol ratio of 1:2; the boride is boric acid.

[0034] When using the above-mentioned carbon-free dry material, mix the ingredients first, and then spread the mixed dry material on the inner surface of the tundish (the specific method can be to spread the dry material on the bottom of the tundish first, and then Put the work...

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Abstract

The invention discloses an environment-friendly carbon-free dry material, and belongs to the technical field of refractory materials. The dry material comprises sintered magnesia, hydrated sodium metasilicate, hydrated magnesium sulfate and boride. The dry material has a low erosion index and a low permeability index, and can adsorb impurities in molten steel in the molten steel refining process,so that the cleanliness of the molten steel is improved, and the carbon pollution of the molten steel can be reduced; and the dry material can prolong the service life of the tundish permanent lining,and is not sintered and easy to turn over after being used.

Description

technical field [0001] The invention relates to a dry material, in particular to a carbon-free dry material, which belongs to the technical field of refractory materials. Background technique [0002] The tundish is a refractory container used in short-process steelmaking. It first receives the molten steel poured from the ladle, and then distributes it to each crystallizer through the tundish nozzle. As an important basic raw material, steel plays a pivotal role in the economic development of countries all over the world. [0003] The tundish is an important part of the continuous casting process. The tundish has developed from the initial role of buffering and stabilizing the flow of molten steel to the current final refining equipment for molten steel. Its functions include refining of molten steel, removal of non-metallic inclusions and improvement of molten steel. With the development of continuous casting steel technology, higher requirements are put forward for the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/66
CPCC04B35/04C04B35/66C04B2235/3427C04B2235/448C04B2235/3409C04B2235/9676
Inventor 曹英杰刘存山李雪吴广军崔小勇潘晓丹
Owner 秦皇岛市首耐新材料有限公司
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