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Steel ladle using casting material prefabricated lower casting nozzle brick and producing method thereof

A technology of ladle pouring and production method, applied in the field of refractory materials, can solve problems such as complex formula, achieve the effects of simple process, increased safety factor and long service life

Active Publication Date: 2012-07-04
HENAN RONGJIN HIGH TEMPERATRUE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite corundum carbon bricks for ladles produced by this method are ordinary bricks for ladles, and the formula is relatively complicated, so they are not suitable for lower spout bricks for ladles.

Method used

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  • Steel ladle using casting material prefabricated lower casting nozzle brick and producing method thereof
  • Steel ladle using casting material prefabricated lower casting nozzle brick and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: A prefabricated lower sprue brick for ladle pouring material. The raw material composition is shown in the corresponding data in Table 2. Taking 100kg of raw material as an example, 27kg of corundum with a particle size of 5-3mm, 22kg of corundum with a particle size of 3-1mm, 1- 0mm corundum 20kg, 44μm corundum 15kg, α-Al 2 o 3 Powder 8kg, pure calcium aluminate cement 8kg; add water 4.5kg, additive 0.5kg.

[0026] α-Al in the table 2 o 3 The particle size of the powder is 5 μm, the cement is pure calcium aluminate with a particle size of 44 μm, and the additive is a mixture of sodium hexametaphosphate and sodium tripolyphosphate, and the weight ratio of the two is 2:1.

[0027] The production method comprises the steps of:

[0028] (1) Mixing material: Weigh the material according to the raw material composition, add tabular alumina and additives into the mixer under stirring, and dry mix for 3-5 minutes; then add water while stirring, and wet mix fo...

Embodiment 2

[0034] Embodiment two: raw material composition sees corresponding data in table 2, differs from embodiment one in that:

[0035] The weight ratio of sodium hexametaphosphate and sodium tripolyphosphate in the additive used is 2:1.

[0036] The production method comprises the steps of:

[0037] (1) Mixing material: Weigh the material according to the raw material composition, add tabular alumina and additives into the mixer under stirring, and dry mix for 3-4 minutes; then add water while stirring, and wet mix for 3-4 minutes; then add α-Al 2 o 3 powder, pure calcium aluminate cement, stir for 8-9 minutes, and discharge; when stirring, the rotation speed is 40-50r / min;

[0038] (2) Vibration forming: Fix the steel shell of the lower casting brick in the mold, open the vibrating table, continuously inject the slurry for pouring, vibrate forming, and then demould; the power of the vibrating table is 5KW, and the vibrating table is first Vibrate for 3-4min, with an amplitude r...

Embodiment 3

[0042] Embodiment three: raw material composition sees corresponding data in table 2, differs from embodiment one in that:

[0043] The weight ratio of sodium hexametaphosphate and sodium tripolyphosphate in the additive used is 1.5:1.

[0044] The production method comprises the steps of:

[0045] (1) Mixing material: Weigh the material according to the raw material composition, add platy corundum and additives into the mixer under stirring, and dry mix for 4 minutes; then add water while stirring, and wet mix for 4 minutes; then add α-Al 2 o 3powder, pure calcium aluminate cement, stirred for 9 minutes, and discharged; the speed of stirring was 60r / min;

[0046] (2) Vibration forming: Fix the steel shell of the lower casting brick in the mold, open the vibrating table, continuously inject the slurry for pouring, vibrate forming, and then demould; the power of the vibrating table is 5KW, and the vibrating table is first Vibrate for 4 minutes, with an amplitude range of 4mm...

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Abstract

The invention relates to a steel ladle using casting material prefabricated lower casting nozzle brick and a producing method thereof; raw materials comprise the following components according to weight percentage: 27-30% of corundum with particle-size of 5 to 3 mm, 22-24% of corundum with particle-size of 3 to 1 mm, 20-22% of corundum with particle-size of 1 to 0 mm, 15-18% of corundum with 44mum, 5-8% of alpha-Al2O3 powder, 3-8% of pure aluminum silicate cement, water accounting for 4-6% of total mass of raw materials, and 0.2-0.5% of additive agent. The producing steps comprise: weighing raw materials, stirring, and discharging; a lower casting nozzle brick steel shell is fixed in a mould, casted, vibrated to be formed, and then demoulded; in the temperature of 15 to 25 DEG C, the lower casting nozzle brick is dried for 3 to 5 days, and then is dried in a dry kiln according to temperature rising requirements. Tests prove that apparent porosity of the product is less than or equal to 20%, volume density is larger than or equal to 3.0g / cm<3>, normal temperature withstand voltage strength is larger than or equal to 30 MPa, and the service life is prolonged; simultaneously production processes are simple, thus reducing the producing cost. Therefore, the invention has good promotional value and social effects.

Description

1. Technical field: [0001] The invention relates to a refractory material, in particular to a casting material for a ladle to prefabricate a lower sprue brick and a production method thereof. 2. Background technology: [0002] The lower sprue bricks used in steel ladles in steelmaking plants are usually formed by semi-dry material machine pressing, and are generally made by drying, casing steel shells, and secondary drying. Material, molding, drying, adding steel shell, secondary drying, packaging and warehousing and other steps. The density deviation of the upper, middle and lower parts of the lower casting mouth brick formed by machine pressing is obvious. During use, it is heated and internal stress will often cause cracks, which may cause safety accidents such as steel penetration and steel leakage. The gap between the lower sprue brick and the set steel shell produced by this method is filled with soft mud; during the second drying, the mud shrinks due to dehydration, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/54C04B35/66
Inventor 徐林富徐跃庆李宏宇徐跃刚梁保青宋桂兰杨晶
Owner HENAN RONGJIN HIGH TEMPERATRUE MATERIALS CO LTD
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