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RH gunning mix and preparation method thereof

A technology of gunning material and fused magnesia, which is applied in the field of RH gunning material and its preparation, can solve the problems of induced gene mutation, environmental pollution, easy entry into human cells, etc., and achieve the effect of simple production method and good permeability resistance

Active Publication Date: 2014-09-10
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chromium is added to existing gunning materials. Chromium is a highly toxic heavy metal that easily enters human cells and causes damage to internal organs such as liver and kidney and DNA. Accumulation in the human body is carcinogenic and may Induces gene mutations, and the discharge of chromium into water and soil is likely to cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation of embodiment 1RH gunning material

[0048] First press 2 parts by weight of nano-zirconia, 2 parts by weight of nano-titanium dioxide, 2 parts by weight of calcium aluminate cement (the brand is C-CA-70), 4 parts by weight of micro-silica powder, α-Al 2 o 3 2 parts by weight, carry out batching, then stir in a stirring device for 15min and mix evenly to obtain a standby mixed material;

[0049] Then weighing 45 parts by weight of fused magnesia coarse particles, 15 parts by weight of fused magnesia fine particles, and 28 parts by weight of fused magnesia fine powder were mixed for 10 minutes in another stirring device to obtain magnesia material;

[0050] Pour the spare mixed material into the magnesia material, add 0.07 parts by weight of carboxymethyl cellulose, stir for 15 minutes and mix well to obtain the product.

Embodiment 2

[0051] The preparation of embodiment 2RH gunning material

[0052] First, 5 parts by weight of nano-zirconia, 6 parts by weight of nano-titanium dioxide, 3 parts by weight of calcium aluminate cement (the brand is C-CA-80), 3 parts by weight of micro-silica powder, α-Al 2 o 3 3 parts by weight, carry out batching, then stir in a stirring device for 17min and mix evenly to obtain a standby mixed material;

[0053] Then weighing 40 parts by weight of fused magnesia coarse particles, 10 parts by weight of fused magnesia fine particles, and 30 parts by weight of fused magnesia fine powder were mixed in another stirring device for 15 minutes to obtain magnesia materials;

[0054] Pour the spare mixed material into the magnesia material, add 0.1 part by weight of carboxymethyl cellulose, stir for 17 minutes and mix well to obtain the product.

Embodiment 3

[0055] The preparation of embodiment 3RH gunning material

[0056] First, 5 parts by weight of nano-zirconia, 4 parts by weight of nano-titanium dioxide, 1 part by weight of calcium aluminate cement (the brand is C-CA-75), 4 parts by weight of micro-silica powder, α-Al 2 o 3 3 parts by weight, carry out batching, then stir in the mixing equipment for 20min and mix evenly to obtain the standby mixed material;

[0057] Then weighing 45 parts by weight of fused magnesia coarse particles, 14 parts by weight of fused magnesia fine particles, and 20 parts by weight of fused magnesia fine powder were mixed in another stirring device for 15 minutes to obtain magnesia materials;

[0058] Pour the spare mixed material into the magnesia material, add 0.05 parts by weight of carboxymethyl cellulose, stir for 20 minutes and mix well to obtain the product.

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Abstract

The invention relates to an RH gunning mix and a preparation method of the RH gunning mix, and belongs to the field of external refining of metallurgical production. According to the technical aim, the invention provides the RH gunning mix and the preparation method of the RH gunning mix. The RH gunning mix is composed of, by weight, 40-45 parts of fused magnesite coarse particles, 10-15 parts of fused magnesite fine particles, 20-30 parts of fused magnesite fine powder, 2-5 parts of nanometer zirconium dioxide, 2-6 parts of nanometer titania, 1-3 parts of calcium aluminate cement, 2-4 parts of silica powder, 2-3 parts of alpha-A12O32 and 0.05-0.1 part of carboxymethylcellulose. The RH gunning mix not only is superior in performance, but also achieves the chromium-free performance and completely meets the specified environmental index and use requirement.

Description

technical field [0001] The invention relates to a RH gunning material and a preparation method thereof, belonging to the field of out-of-furnace refining in metallurgical production. Background technique [0002] In 1957, German Thyssen Steel Company invented the vacuum cycle degassing-RH method. In the 1970s and 1980s, Japan successively developed the RH-OB method, RH-KTB method and RH-PB method, and continuously improved the refining of RH. Function. As the market has higher and higher requirements for the cleanliness of steel and the demand for high-quality steel increases, most steel mills at home and abroad have been equipped with RH refining devices. During the refining process, the use conditions of the RH insertion tube are harsh, especially the outer castable is subjected to the erosion of high-temperature molten steel, the erosion of molten slag, and the thermal shock of rapid cooling and rapid heating, resulting in melting loss and peeling of the castable, which ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 李龙张强杨大刚陈永曾建华戈文荪陈炼李扬洲杨森祥童贤强李平凡杜利华王军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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