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Steel ladle drainage sand for ultra-low carbon steel and preparation method

A technology of ultra-low carbon steel and drainage sand, which is applied in the field of drainage sand for ladles, can solve the problems of high production cost, carbon increase of ultra-low carbon steel, environmental pollution, etc., and achieve the effect of simple and controllable production process

Active Publication Date: 2014-06-25
JIANGSU JIANAI HIGH TEMPERATURE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, until the time of this patent application, the existing drainage sand has the following shortcomings: [1] SiO2 and impurities If the content is too high, it is easy to be reduced by active elements in steel and pollute molten steel; [2] The raw material is chrome ore, which generates Cr6 + carcinogens during use, causing great pollution to the environment; [3] Zircon sand is used as raw material, and the production cost is high; [4] flake graphite, carbon black, resin, carbonized rice husk and other materials are added as lubricants or binders when producing drainage sand, which will lead to carbonization of ultra-low carbon steel

Method used

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  • Steel ladle drainage sand for ultra-low carbon steel and preparation method

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Embodiment 1

[0019] Embodiment 1: Get some magnesium aluminum spinel raw materials, after analyzing its chemical composition is: MgO 27.00wt%, Al 2 o 3 72.00wt%, SiO2 0.34wt%; some raw materials of fused magnesia were taken, and its chemical composition was analyzed as follows: MgO 97.00wt%, CaO 1.93wt%, Fe 2 o 3 0.36wt%, SiO2 0.58wt%, IL 0.13wt%. The two raw materials are crushed, milled with water for 30 minutes, rinsed, and dried to measure H2O: 0.31wt%, and sieved to 20-40 mesh, 40-60 mesh, 60-80 mesh particles for later use. See Table 1 below for examples of different particle grading schemes. The site uses a 120-ton ladle to smelt X80 pipeline steel in A Steel Plant. A total of 56 furnaces were tested, and 55 furnaces were automatically poured.

[0020] As shown in Table 1: A ladle drainage sand for ultra-low carbon steel

[0021]

Embodiment 2

[0022] Embodiment two: get some magnesia-aluminum spinel raw materials, after analyzing its chemical composition is: MgO 32.00wt%, Al 2 o 3 67.00wt%, SiO 2 0.47wt%; some raw materials of fused magnesia were taken, and its chemical composition was analyzed as follows: MgO 98.15wt%, CaO 0.89wt%, Fe 2 o 3 0.44wt%, SiO 2 0.45wt%, IL 0.07wt%. The two raw materials are crushed well, water milled for 20 minutes, rinsed with water, dried for H 2 O: 0.25wt%, sieved to 20-40 mesh, 40-60 mesh, 60-80 mesh particles for later use. See Table 2 below for examples of different particle grading schemes. The 150-ton ladle of B Steel Plant was used on site to smelt 08AL steel. A total of 42 furnaces were used, all of which were self-opening.

[0023] As shown in Table 2: a ladle drainage sand for ultra-low carbon steel

[0024]

Embodiment 3

[0025] Embodiment three: get some magnesia-aluminum spinel raw materials, after analyzing its chemical composition is: MgO 29.75.00wt%, Al 2 o 3 69.80wt%, SiO 2 0.39wt%; Some raw materials of fused magnesia were taken, and the chemical composition was analyzed as follows: MgO 98.37wt%, CaO 0.75wt%, Fe 2 o 3 0.50wt%, SiO 2 0.30wt%, IL 0.08wt%. The two raw materials are crushed well, water milled for 20 minutes, rinsed with water, dried for H 2 O: 0.37wt%, sieved to 20-40 mesh, 40-60 mesh, 60-80 mesh particles for later use. See Table 3 below for examples of different particle grading schemes. On site, 08AL steel was smelted with a 150-ton ladle in No. 2 Steel Plant. A total of 35 furnaces were used, all of which were opened by themselves.

[0026] As shown in Table 3: a ladle drainage sand for ultra-low carbon steel

[0027]

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Abstract

The invention discloses steel ladle drainage sand for ultra-low carbon steel, which comprises the following elements in percentage by mass: 45-60wt% of MgO, 35-50wt% of Al2O3, 1-6wt% of SiO2, less than or equal to 50ppm of C solid, less than or equal to 0.5% of H2O and the balance of unavoidable impurities. A preparation method of the steel ladle drainage sand comprises the following steps of: a, breaking 55-70wt% of magnesia-alumina spinel and 30-45wt% of fused magnesia by weight into particles respectively; b, performing water grinding of the particles of magnesia-alumina spinel and fused magnesia with a disc for 10-30 minutes respectively, thoroughly flushing with clean water, and drying into raw material with less than or equal to 0.5% of H2O for use; and c, adding 1-5wt% of pinniform polycrystalline silicon as an additive into the standby raw material in relative to the mass percentage of the standby raw material, adding into a muller and mulling for 5-10 minutes; and after qualified verification, packaging and storing to obtain the finished product. The key of the invention is to find an additive through an experiment and to control the sintering of the drainage sand without carbon through a proper particle-level composition production technology so as to realize an ideal self-opening rate.

Description

technical field [0001] The invention relates to drainage sand for ladles, in particular to drainage sand for ladles for ultra-low carbon steel. Background technique [0002] Metallurgists have long discovered that reducing the carbon content of steel can improve the processing performance and serviceability of steel. The various excellent properties of ultra-low carbon steel make it more and more widely used. The demand for variety and quantity is increasing, such as IF steel, automobile 05 plate, DI material, X series pipeline steel and other key steel types, and the requirement for carbon is getting lower and lower. The representative steel type is IF steel, which is also commonly known as automobile sheet steel. [0003] The carbon content range of ultra-low carbon steel varies according to specific requirements, and there is no recognized strict standard. It is generally believed that [C]≤200ppm in steel can be called ultra-low carbon steel, which is mainly determined ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 吴永来谢健杨政宏尹玉服李杰
Owner JIANGSU JIANAI HIGH TEMPERATURE MATERIAL
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