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Ultra-pure steel corrosion-free type covering agent and production method thereof

A production method and covering agent technology, applied in the field of ultra-pure steel non-erosion covering agent, can solve the problem of increasing the difficulty of on-site operation and the cost of steelmaking production, affecting the smooth flow of continuous casting production, and being difficult to promote and use in steel mills, etc. problems, to achieve the effect of improving comprehensive alkalinity and fluidity, good spreadability, and easy operation and use

Active Publication Date: 2011-11-09
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are many problems in the use of the double-layer tundish covering agent and the high-alkalinity tundish covering agent. Due to the high melting point and high alkalinity of the high-alkalinity covering agent, it is easy to sinter and produce crusting during use. Affects the straight flow of continuous casting production. In addition, in order to solve the problem of easy crusting during use, the high-alkalinity covering agent is generally equipped with a large proportion of NaO and F - Such as flux materials, it is easy to cause corrosion to the lining; and the double-layer tundish covering agent is used in many types (two types), which increases the difficulty of on-site operation and the cost of steelmaking production, so it is difficult to promote the use in steel mills

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The composition of the ingredients in an ultra-pure steel non-corrosive covering agent is as follows: SiO 2 3.3%, CaO 41.3%, MgO 10.2%, Fe 2 o 3 1.2%, Al 2 o 3 31.3%, Na 2 O 0.6%, F 0.5%, C 固 0.3%, H 2 O 0.27%, the balance is loss on ignition and K 2 O, MnO, TiO 2 etc. (impurities). For every 100 parts of raw materials, take 35 parts of pre-melted refining slag, 15 parts of pre-melted aluminum-calcium slag, 15 parts of low-calcium aluminate cement, and 35 parts of light-burned dolomite; crush the above raw materials until the particle size is not greater than 200 mesh, Then mix well for 0.5h, add 2.5% sodium carboxymethyl cellulose as a binder, mill with water for 1h to obtain a slurry with a concentration of 55%, and spray dry to obtain the covering agent.

Embodiment 2

[0021] The composition of the ingredients in an ultra-pure steel non-corrosive covering agent is as follows: SiO 2 2.8%, CaO 41.8%, MgO 8.9%, Fe 2 o 3 1.0%, Al 2 o 3 33.3%, Na 2 O 0.4%, F 0.3%, C 固 0.3%, H 2 O 0.30%, the balance is loss on ignition and K 2 O, MnO, TiO 2 etc. (impurities). For every 100 parts of raw materials, take 35 parts of pre-melted refining slag, 20 parts of pre-melted aluminum-calcium slag, 15 parts of low-calcium aluminate cement, and 30 parts of light-burned dolomite; crush the above raw materials until the particle size is not greater than 200 mesh, Then mix well for 0.5h, add 2.2% (added amount) sodium carboxymethyl cellulose as a binder, mill with water for 1h to obtain a slurry with a concentration of 58%, and spray dry to obtain the covering agent.

Embodiment 3

[0023] The composition of the ingredients in an ultra-pure steel non-corrosive covering agent is as follows: SiO 2 3.5%, CaO 42.5%, MgO 10.3%, Fe 2 o 3 1.1%, Al 2 o 3 29.9%, Na 2 O 0.5%, F 0.4%, C 固 0.2%, H 2 O 0.29%, the balance is loss on ignition and K 2 O, MnO, TiO 2 etc. (impurities). For every 100 parts of raw materials, take 35 parts of pre-melted refining slag, 20 parts of pre-melted aluminum-calcium slag, 10 parts of low-calcium aluminate cement, and 35 parts of light-burned dolomite; crush the above raw materials until the particle size is not greater than 200 mesh, Then mix well for 0.5h, add 3% sodium carboxymethyl cellulose as a binder, mill with water for 1h to obtain a slurry with a concentration of 58%, and spray dry to obtain the covering agent.

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Abstract

The invention discloses an ultra-pure steel corrosion-free type covering agent and a production method thereof. The covering agent comprises the following components in percentage by weight: not more than 6 percent of SiO2, 40 to 45 percent of CaO, 7 to 11 percent of MgO, not more than 1.5 percent of Fe2O3, 29 to 35 percent of Al2O3, not more than 1 percent of Na2O, not more than 1 percent of F and not more than 1 percent of fixed carbon. The invention has the advantages that: premelting type refining slag, premelting type aluminum-calcium slag, calcium aluminate cement and light-roasted dolomite carbon-free low-silicon high-alkalinity materials are used as raw materials, the materials are reasonably matched with one another, and a covering slag atomization granulation production process is used for production, so that the covering agent has the advantages of high spreadability, no incrustation and no silicon addition, is easy and convenient to operate and use, improves the quality ofpurified molten steel during use, is granular, does not have dust pollution, and the like.

Description

[0001] technical field [0002] The invention belongs to the technical field of auxiliary materials for steelmaking, in particular to an ultra-pure steel non-erosion covering agent and a production method thereof. technical background [0003] The main metallurgical function of the covering agent is to keep the molten steel warm to reduce heat loss and temperature drop during the casting process, and to avoid the surface of the molten steel from freezing steel during the casting process; after melting, a liquid slag layer is formed to cover the surface of the molten steel to isolate the air and prevent the molten steel from Functions such as secondary oxidation and adsorption of non-metallic inclusions floating in molten steel. With the continuous improvement of continuous casting technology and the development of pure steel, the requirements for covering agents are also increasing day by day. No increase in carbon, no increase in silicon, no pollution to molten steel, no e...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 张令罗志刚唐红波
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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