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Molten steel heat preservation covering agent capable of achieving heat supplementing

A thermal insulation covering agent and covering agent technology, applied in the field of metallurgical auxiliary materials, can solve the problems of easy crusting on the surface, poor thermal insulation, large temperature drop of molten iron and molten steel, etc., and achieve the effect of small surface tension, small thermal conductivity, and reduction of inclusions

Active Publication Date: 2021-09-03
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a covering agent for ladles, ladles and tundishes, which overcomes the large temperature drop of molten iron and steel caused by the poor thermal insulation of existing covering agents and the easy crusting on the surface and other limitations, to meet the steelmaking process requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Ladle and ladle covering agent are as follows:

[0030]The first layer is selected as the covering agent, which includes by mass percentage: coke oven dust, blast furnace dust or coke powder sieve: 42%, expanded perlite: 14%, dolomite: 19%, expanded vermiculite: 12% %, aluminum silicate fiber: 9%, ferrosilicon powder 4%. The particle size distribution of each raw material is calculated by mass percentage as:

[0031] Expanded perlite: 79% for 1-3mm, 21% for 3-5mm.

[0032] Diatomite: 0.074~1mm 55%, 0~0.074mm 45%.

[0033] Aluminum silicate fiber: 0~1mm 6%, 1~3mm 41%, 3~7mm 53%.

[0034] Dolomite: 68% for 1-4mm; 32% for 0.5-1mm.

[0035] The particle size of ferrosilicon powder is less than 0.074mm.

[0036] Using the covering agent and feeding method, the covering agent can be quickly spread during the ladle transportation process, covering the liquid surface of the molten iron, and has a good heat preservation effect. Using ordinary covering agent products, the t...

Embodiment 2

[0038] The ladle, tundish covering agent and feeding method for smelting a certain type of steel are as follows:

[0039] Upper layer covering agent: In terms of mass percentage, it includes: coke oven dust or coke powder: 43%, expanded perlite: 14%, expanded vermiculite: 8%, dolomite: 21%, aluminum silicate fiber: 9%, silicon Iron powder: 5%.

[0040] The main composition of the lower layer is: lightly burned dolomite: 56%, lime: 33%, one or more of boron nitride, magnesium hydroxide, magnesium borate: 7%, lithium peroxide or sodium peroxide: 4%.

[0041] Among them, boron nitride, magnesium hydroxide, magnesium borate, or one or two or three of them are mixed in proportion by mass percentage: 62% of boron nitride, 8% of magnesium hydroxide, and 30% of magnesium borate. One or both of the lithium peroxide and the sodium peroxide are mixed in proportion in terms of mass percentage: 30% of lithium peroxide and 70% of sodium peroxide.

[0042] The particle size distribution of...

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Abstract

The invention discloses a molten steel heat preservation covering agent capable of achieving heat supplementing. The covering agent is a first-layer covering agent or comprises the first-layer covering agent and a second-layer covering agent at the same time, wherein the first-layer covering agent is composed of one or more of dry quenching furnace fly ash, blast furnace fly ash or coke screen underflow, and further comprises expanded perlite, expanded vermiculite, aluminum silicate fibers, dolomite and ferrosilicon powder; and the second-layer covering agent is composed of one or more of light-burned dolomite, lime, lithium peroxide or sodium peroxide, boron nitride, magnesium hydroxide or magnesium borate. The covering agent for hot metal ladles, steel ladles and tundishes is provided to overcome the limitation that due to the fact that an existing covering agent is poor in heat preservation performance, the temperature of molten iron and molten steel is greatly reduced, and the surfaces are prone to crusting; and the requirement of the steelmaking technology is met.

Description

technical field [0001] The invention relates to the technical field of metallurgical auxiliary materials, in particular to a covering agent for metallurgy, in particular to a thermal insulation covering agent capable of replenishing heat for molten steel. Background technique [0002] Ladles, ladles and tundishes play a role in connecting the past and the future in the steelmaking process. With the increasing requirements for steel quality, they are used to reduce the temperature drop of ladles, ladles and tundishes, and to protect molten steel in ladles and tundishes. Being secondary oxidized, fully adsorbing molten steel inclusions, ladle, ladle and tundish covering agent are getting more and more attention. At present, the thermal insulation covering agents for molten steel mainly include acidic thermal insulation covering agents and alkaline thermal insulation covering agents. Among them, the acid thermal insulation covering agent has good thermal insulation performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/076B22D11/111
CPCC21C7/00C21C7/005C21C7/076B22D11/111Y02P10/20
Inventor 周旺枝徐国涛秦世民刘黎陈大忠张洪雷
Owner 武汉钢铁有限公司
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