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Preparation method of covering agent of alkaline steel ladle or tundish

A production method and technology of covering agent, which are applied in the production field of basic ladle or medium-ladle covering agent, can solve the problems of low utilization rate and high energy consumption of calcium-silicon slag, and achieve the reduction of circulating treatment volume, price reduction and simple process method. Effect

Inactive Publication Date: 2011-08-17
武汉振海科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has low utilization rate of calcium-silicon slag and high energy consumption

Method used

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  • Preparation method of covering agent of alkaline steel ladle or tundish
  • Preparation method of covering agent of alkaline steel ladle or tundish
  • Preparation method of covering agent of alkaline steel ladle or tundish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Flash-evaporate and dry the dehydrated calcium-silicon slag at 100-120°C to remove the powdery material obtained by removing the attached water;

[0015] The powdery material after flash evaporation enters the calcining furnace with a combustion temperature of 800℃~1200℃. After the calcined product is cooled, it is ground into powder with a particle size ≤0.088mm for use; it can be ground by a ball mill. The combustion temperature can be any temperature value between 800°C and 1200°C, such as 800°C, 850°C, 900°C, 1000°C, 1100°C or 1200°C, which can remove the crystal water in the calcium silicon slag or realize calcium The crystal phase transformation of the substance in the silicon slag.

[0016] The chemical composition is shown in the table below.

[0017] name

CaO

Al 2 O 3

SiO 2

Fe 2 O 3

TiO 2

R 2 O

Burn

％

35-48

32-42

<3.5

<1.5

<0.02

5-10

<8

[0018] The silica and lime are mixed uniformly according to the weight ratio of 45:55, and the me...

Embodiment 2

[0023] Flash-evaporate and dry the dehydrated calcium-silicon slag at 100-120°C to remove the powdery material obtained by removing the attached water;

[0024] The powdery material after flash evaporation enters the calcining furnace with a combustion temperature of 1100℃. After the calcined product is cooled, it is ground into powder with a particle size of ≤0.088mm for use; it can be ground by a ball mill.

[0025] The chemical composition is shown in the table below.

[0026] name

CaO

Al 2 O 3

SiO 2

Fe 2 O 3

TiO 2

R 2 O

Burn

％

35-48

32-42

<3.5

<1.5

<0.02

5-10

<8

[0027] The silica and lime are mixed uniformly according to the weight ratio of 45:55, and the melting is carried out. The melting conditions are: heating up to 1350℃~1550℃, after 8-12 hours, it will form the main lithofacies as CaO·SiO 2 的melt. After the melt is crushed, 0-30% fixed carbon is added according to the different steel types for co-grinding to a material degree ≤ 1mm. After crushing th...

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Abstract

The invention discloses a preparation method of a covering agent of alkaline steel ladle or tundish. The method comprises the following steps: performing flash distillation drying to the dehydrated calcium silicon slag at 100-120 DEG C to remove adhesive water and obtain powder material, calcining the powder material at 800-1200 DEG C to obtain calcine, grinding, mixing silica and lime in a weight ratio of 40-50:50-60 evenly to reach 100% of weight fraction, fusing, heating to 1350-1550 DEG C for 8-12h to obtain a fused material of which lithofacies is CaO.SiO2; crushing the fused material, and mixing the fused material with the grinded calcine in a weight ratio of 35-45:55-60 evenly to reach 100% of weight fraction and obtain the covering agent of alkaline steel ladle or tundish. The method of the invention fully uses the calcium-silicon slag generated in the production process of the alumina production enterprise to prepare the covering agent of alkaline steel ladle or tundish, the process method is simple and is easy to control; the energy consumption and cost caused by returning ingredients and sintering are eliminated so as to greatly reduce the production cost of the covering agent of alkaline steel ladle or tundish.

Description

[0001] Technical Field Ladle or tundish covering agent, specifically relates to a production method of alkaline ladle or tundish covering agent. Background technique [0002] Steel (middle) ladle covering agent is a kind of covering agent that is added to the surface of steel (middle) ladle molten steel, with thermal insulation as its main performance. The three basic functions it must have are: (1) Keep a layer of heat-preserving and insulating powder on the liquid slag layer to prevent the molten steel from transmitting or radiating heat to the air. Thermal insulation performance is the most important technical index of the ladle covering agent, which can reduce the tapping temperature, save energy and increase output. (2) Isolate the contact between molten steel and surrounding air. (3) No or less erosion of the bag lining, no crusts after pouring, and easy to fall off from the bag lining. In addition to the above-mentioned basic functions, as a covering agent for the produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 张启宇
Owner 武汉振海科技有限公司
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