RH chromium-free gunning material and preparation method thereof

The technology of gunning material and fused magnesia is applied in the field of RH chromium-free gunning material and its preparation, which can solve the problems of environmental pollution, induced gene mutation, damage, etc., and achieve the effects of good permeability resistance and simple production method.

Active Publication Date: 2014-09-24
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

preparation example Construction

[0042] The preparation method of RH chrome-free gunning material of the present invention, according to raw material ratio, first takes nanometer ZrO 2, sodium hexametaphosphate, boric acid, silicon micropowder, and aluminum dihydrogen phosphate are mixed, stirred and evenly mixed to obtain a standby mixed material;

[0043] Weigh the coarse particles of fused magnesia, the fine particles of fused magnesia, and the fine powder of fused magnesia, mix them, and stir to obtain the magnesia material;

[0044] Mix the spare mixed material with the magnesia material, add carboxymethyl cellulose, stir and mix evenly, and obtain the RH chrome-free gunning material.

[0045] The RH chromium-free gunning material of the present invention adopts the current wet gunning technology, and the amount of water added is controlled at about 15 to 25 wt% of the RH chromium-free gunning material for gunning operation.

Embodiment 1

[0047] The preparation of embodiment 1RH chrome-free gunning material

[0048] First, according to 5 parts by weight of nano zirconium dioxide, 2 parts by weight of sodium hexametaphosphate, 1 part by weight of boric acid, 2 parts by weight of silicon micropowder, and 2 parts by weight of aluminum dihydrogen phosphate, carry out batching, and then stir in a stirring device for 15 minutes to mix evenly. Obtain the spare mixture;

[0049] Then weigh 43 parts by weight of fused magnesia coarse particles, 15 parts by weight of fused magnesia fine particles, and 30 parts by weight of fused magnesia fine powder, stir in another stirring device for 10 minutes and mix evenly to obtain magnesia materials;

[0050] Pour the spare mixed material into the magnesia material, add 0.05 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 chrome-free gunning material

[0052] First, according to 7 parts by weight of nano zirconium dioxide, 2 parts by weight of sodium hexametaphosphate, 2 parts by weight of boric acid, 4 parts by weight of silicon micropowder, and 3 parts by weight of aluminum dihydrogen phosphate, carry out batching, and then stir in a stirring device for 17 minutes to mix evenly. Obtain the spare mixture;

[0053] Then weigh 42 parts by weight of fused magnesia coarse particles, 15 parts by weight of fused magnesia fine particles, and 25 parts by weight of fused magnesia fine powder, stir in another stirring device for 15 minutes and mix evenly to obtain magnesia materials;

[0054] Pour the spare mixed material into the magnesia material, add 0.07 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 chromium-free gunning material and a preparation method thereof and belongs to the field of external refining of metallurgy production. The technical problem solved by the invention is to provide the RH chromium-free gunning material and the preparation method thereof. The RH chromium-free gunning material comprises the following components in parts by weight: 40-45 parts of fused magnesite coarse particle, 10-15 parts of fused magnesite fine particle, 20-30 parts of fused magnesite fine powder, 5-10 parts of nanometer zirconium dioxide, 1-3 parts of sodium hexametaphosphate, 1-2 parts of boric acid, 2-4 parts of silica powder, 2-4 parts of aluminium dihydrogen phosphate and 0.05-0.1 part of carboxymethylcellulose. The RH chromium-free gunning material provided by the invention is superior in performance and free of chromium and completely meets the specified environmental indexes and use requirements.

Description

technical field [0001] The invention relates to a RH chromium-free 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. Features. 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 ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李龙陈永张强曾建华冉茂华王建杨大刚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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