Method for producing high thermokeeping continuous casting protective slag

A technology of continuous casting mold powder and production method, which is applied to the production field of high thermal insulation continuous casting mold powder, can solve problems such as affecting thermal insulation performance, and achieve the effects of improving thermal insulation performance, increasing continuous casting speed, and reducing slag consumption.

Inactive Publication Date: 2006-05-10
UNIV OF SCI & TECH LIAONING
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AI Technical Summary

Problems solved by technology

The bulk density of this mold powder is 0.6-0.8 kg / m3, which affects the thermal insulation performance

Method used

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  • Method for producing high thermokeeping continuous casting protective slag

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Embodiment Construction

[0008] Such as figure 1 Shown, this method step is as follows: (a) raw material ratio: limestone powder 16%, sodium carbonate powder 18%, carbon black 2%, graphite 8%, wollastonite powder 38%, corundum powder 4%, magnesia powder 2% %, 7% fluorite powder, 2% iron ore powder, and 3% binder; (b) Put the prepared raw materials into the cone mixer and mix for 60-100 minutes, then put the stirred powder Finely grind in a barrel mill for 20 to 50 minutes to make the powder particle size ≤ 200 mesh; (c) put the ground powder ≤ 200 mesh into the first-stage mixing tank according to the powder containing 30 to 70% (weight) Mix and stir for 60 to 100 minutes with a ratio of 70 to 30% water, then transfer from the primary stirring tank to the secondary stirring tank and stir for 15 to 30 minutes; Under the pressure of 10 MPa, use atomizing nozzles in a vacuum drying room with a vacuum degree of 0-380mmHg and a temperature of 600-700°C to spray and granulate into hollow continuous casting...

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Abstract

The invention discloses a method for producing the high heat-insulating continuous casting protective dregs, comprising: (a), material selection: limestone powder, sodium carbonate powder, carbon black, graphite, wollastonite in lump, emery, magnesite , fluor powder, iron ore powder, and binding agent; (b) material mixing and milling; (3) mixing the milled powder and water; (d) spraying granulation to form the hollow continuous casting protective dregs; (e) filtration and package that exhausting the waste gas whose micro-powder is separated by cyclone filter. The invention adds the material as carbonic acid salt into the material of continuous casting protective dreg, and the carbonic acid salt can decompose to form the CO2 gas in the spraying granulation process to enlarge the inter-space of continuous casting protective dregs; and processes the spraying granulation in vacuum to enlarge said inter-space more. The invention can improve the heat-insulating property of continuous casting protective dregs; stabilize the layer of continuous casting protective dregs and the meniscus shape of continuous casting blank; improve the surface quality of continuous casting blank; reduce the dreg consumption of continuous casting protective dregs; and improve the continuous casting of continuous casting.

Description

technical field [0001] The invention relates to a production method for steelmaking and continuous casting mold slag, especially a production method for high thermal insulation continuous casting mold slag. Background technique [0002] The functions of continuous casting mold flux are heat insulation, lubrication, improving heat transfer of continuous casting slabs, preventing secondary oxidation, and absorbing inclusions in steel. It has a great influence on the surface quality and casting speed of the continuous casting slab, and is one of the main research technologies of continuous casting at present. Among them, the heat preservation performance is the main performance of the continuous casting mold slag. The heat preservation performance of the continuous casting mold slag is good, which can stabilize the liquid slag layer of the continuous casting mold slag, and the surface quality of the continuous casting slab is good, which can increase the casting speed of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 沈明钢
Owner UNIV OF SCI & TECH LIAONING
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