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Converter tapping hole gunning mix and preparation method thereof

A technology of tapping hole and gunning material, which is applied in the field of converter refractories and can solve the problems of long time required

Active Publication Date: 2020-12-29
HUNAN XIANGGANG RUITAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The safety performance of the method for filling casing bricks and seat bricks at the taphole of the converter in the present invention is improved, and steel leakage accidents at the taphole are not easy to occur, but it takes a long time

Method used

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  • Converter tapping hole gunning mix and preparation method thereof
  • Converter tapping hole gunning mix and preparation method thereof
  • Converter tapping hole gunning mix and preparation method thereof

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preparation example Construction

[0045] The present invention also provides a method for preparing the above-mentioned converter tapping hole gunning material, which includes: mixing magnesium-containing waste, fused leather sand, phosphate, slaked lime, silica fume and sintering agent to obtain converter tapping hole gunning material.

[0046] Wherein, the magnesium-containing waste, fused leather sand, phosphate, slaked lime, silica fume and sintering agent are all the same as above, and will not be repeated here.

[0047] In the present invention, the magnesium-containing waste is preferably prepared according to the following method: recycle the magnesium-containing waste bricks after thermal equipment is used, remove impurities and sort them, and crush them into three kinds of grains: 5-3mm, 3-1mm, and 1-0mm. grade, to obtain magnesium-containing waste.

[0048] It is also preferred that the phosphate is crushed separately from the sintering agent and sieved through a 2 mm screen before mixing.

[0049...

Embodiment 1

[0057] In a 210-ton converter in a steel plant, magnesia-iron-aluminum spinel waste 5-3mm15%, magnesia-iron-aluminum spinel waste 3-1mm30%, magnesia-iron-aluminum spinel waste 1-0mm25%, fused sand fine Powder 25.5%, sodium tripolyphosphate 2%, slaked lime 1.5%, silica fume 0.5%, boric acid 0.3%, citric acid 0.2% gunning material 800kg is loaded into the 210-ton converter on-site gunning machine in the steel plant, and the new Wet gunning is carried out on the replaced slide plate slag-stopping outlet. The temperature in the furnace is 1200 ℃ ~ 1400 ℃, and the gunning time is 15 minutes. After the slag mechanism is subjected to molten iron steelmaking, the steel type is low-carbon steel. The gunning material MgO+Al 2 o 3 88.64%, 1500℃*3hr cold compressive strength is 32.4MP a , the bulk density is 2.42g / cm 3 , The service life of the tap hole is 262 furnaces, the steel receiving time is 175h, and the tapping hole and gunning material drilling time is 12min.

Embodiment 2

[0059] In a 120-ton converter in a steel plant, magnesia-alumina spinel waste 5-3mm12%, magnesia-alumina spinel waste 3-1mm35%, magnesia-alumina spinel waste 1-0mm23%, fused sand fine powder 24.3% , sodium hexametaphosphate 2.5%, slaked lime 2%, silica fume 0.7%, boric acid 0.2%, citric acid 0.3% gunning material 600kg is loaded into the 120-ton converter on-site gunning machine in the steel plant, and the newly replaced slide plate Wet gunning is carried out at the slag-stopping outlet, the temperature in the furnace is 1100°C-1300°C, the gunning time is 12 minutes, after gunning, the gunning material is baked in high fire for 10 minutes, the converter is shaken to the front of the furnace, and the slag-stopping mechanism is installed The steel is made by molten iron, and the steel type is ordinary construction steel. The gunning material MgO+Al 2 o 3 89.29%, 1500℃*3hr cold compressive strength is 30.8MPa, bulk density is 2.38g / cm 3 , The service life of the tap hole is 32...

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Abstract

The invention provides a gunning mix for a tapping hole of a converter. The gunning mix comprises the following components in parts by weight: 65-75 parts of magnesium-containing waste; 20 to 30 partsby weight of fused skin sand; 1.5 to 2.5 parts by weight of phosphate; 1-2 parts by weight of slaked lime; 0.25 to 0.75 part by weight of silica fume; and 0.3-0.7 part by weight of a sintering agent,wherein the content of MgO in the magnesium-containing waste is not lower than 80%. Compared with the prior art, the gunning material has the advantages that the magnesium-containing waste is used asaggregate, the fused skin sand is added to promote sintering of a matrix phase of the gunning material, phosphate is used as a binding agent to enable the gunning material to have high strength at medium and low temperatures, and meanwhile silica fume is added into the gunning material to fill part of gaps of the matrix and compact the gunning material; and the additive can react with MgO and CaOat a high temperature to generate high-temperature phases such as forsterite or calcium forsterite, so that the slag corrosion resistance of the gunning material is improved, and the gunning materialhas the advantages of low cost, moderate volume density, high sintering speed, moderate sintering strength, easiness in drilling and long service life.

Description

technical field [0001] The invention belongs to the technical field of converter refractory materials, and in particular relates to a converter tapping hole gunning material and a preparation method thereof. Background technique [0002] Converter sliding plate slag blocking is a new technology for converter slag blocking that has emerged in recent years. The combination of this technology and the infrared detection technology of converter lower slag has achieved good results. Return phosphorus and sulfur in molten steel, increase alloy yield; reduce inclusions in steel, improve cleanliness of molten steel; reduce ladle slag, prolong service life of ladle refractory materials, and produce high-quality, high-tech, high-value-added excellent products for converters. Steel products create conditions. [0003] The taphole matched with the sliding plate slag retainer is the flow steel channel for introducing the converter molten steel into the ladle. It is located in the taphole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/622C04B35/64
CPCC04B35/043C04B35/62204C04B35/64C04B2235/3208C04B2235/3418C04B2235/447C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607Y02P10/20
Inventor 朱新军唐安山曾立民刘利华
Owner HUNAN XIANGGANG RUITAI TECH
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