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A continuous casting mold powder for reducing bonding breakout and preparation method thereof

A continuous casting mold slag and breakout technology, which is applied in the field of continuous casting production technology, can solve the problems of high probability of mold slag bonding, affecting the fluidity of molten slag, and high viscosity of mold slag, so as to avoid sticking accidents and reduce generation rate, improving the effect of melting distance

Active Publication Date: 2019-04-26
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity of the mold slag is relatively high, which affects the fluidity of the slag, and the probability of bonding the mold slag is relatively high, resulting in a relatively high probability of steel breakout
[0005] Chinese Patent Application No. 201310540920.8 discloses a mold powder for ultra-low carbon steel and low carbon steel mold for continuous casting of automobile plates. In terms of weight percentage, its chemical composition is: 27%2 2 o 3 +MgO2 o 3 - 2 O2 O is an alkali metal oxide with an alkalinity of 0.75-1.1. The mold powder prepared by this invention is to improve the lubrication of the cast slab and the surface quality of the cast slab, and its viscosity is relatively high, so it is not suitable for improving the bonded breakout

Method used

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  • A continuous casting mold powder for reducing bonding breakout and preparation method thereof

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Effect test

Embodiment 1

[0028] A method for preparing continuous casting mold flux for reducing bonding breakout, comprising the following steps:

[0029] (1) Ingredients: The continuous casting mold flux for reducing bonding breakout is prepared from the following raw materials by weight percentage: premelt: 20%, soda ash: 10%, fluorite: 11%, quartz: 7%, Wollastonite: 34%, bentonite: 2%, bauxite: 2%, sodium fluoride: 8%, cryolite: 2%, carbonaceous material: 3%, sodium hydroxymethyl cellulose: 1%, of which Carbonaceous materials include earthy graphite 2% and carbon black 1%;

[0030] (2) After mixing the raw materials evenly, add water to make pulp, the pulping time is 60 minutes, and the slurry is obtained, and the concentration of the slurry is 58%;

[0031] (3) The slurry is sent to the prilling tower through the plunger pump for spray granulation. The pressure of the plunger pump is 0.8MPa, the slurry delivery speed is 20L / min, and the hole diameter of the spray gun is 2.0mm during spray granul...

Embodiment 2

[0035] A method for preparing continuous casting mold flux for reducing bonding breakout, comprising the following steps:

[0036] (1) Ingredients: The continuous casting mold flux for reducing bonding breakout is prepared from the following raw materials by weight percentage: premelt: 40%, soda ash: 8%, fluorite: 8%, quartz: 5%, Wollastonite: 24%, bentonite: 5%, sodium fluoride: 5%, cryolite: 1%, carbonaceous material: 2%, sodium hydroxymethyl cellulose: 2%, and the carbonaceous material includes soil Graphite 1% and carbon black 1%;

[0037] (2) After mixing the raw materials evenly, add water to make pulp, the pulping time is 65 minutes, and the slurry is obtained, and the concentration of the slurry is 60%;

[0038] (3) Send the slurry to the prilling tower through the plunger pump for spray granulation, wherein the plunger pump pressure is 1.0MPa, the slurry delivery speed is 21L / min, and the aperture diameter of the spray gun spray sheet is 2.0mm during spray granulatio...

Embodiment 3

[0042] A method for preparing continuous casting mold flux for reducing bonding breakout, comprising the following steps:

[0043] (1) Ingredients: The continuous casting mold flux for reducing bonding breakout is prepared from the following raw materials by weight percentage: premelt: 29%, soda ash: 9%, fluorite: 9%, quartz: 6%, Wollastonite: 26%, bentonite: 3%, bauxite: 2%, sodium fluoride: 7%, cryolite: 2%, carbonaceous material: 4%, sodium hydroxymethyl cellulose: 3%, of which Carbonaceous materials include earthy graphite 2% and carbon black 2%;

[0044] (2) After mixing the raw materials evenly, add water to make pulp, the pulping time is 70 minutes, and the slurry is obtained, and the concentration of the slurry is 62%;

[0045] (3) The slurry is sent to the prilling tower through the plunger pump for spray granulation. The pressure of the plunger pump is 1.2MPa, the slurry delivery speed is 22L / min, and the aperture of the spray gun is 2.0mm during spray granulation. ...

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Abstract

The invention discloses a continuous-casting mold flux for decreasing sticking steel breakouts and a preparation method thereof. The continuous-casting mold flux for decreasing the sticking steel breakouts comprises the following chemical components of, by weight, 32.5-35.5 percent of SiO2, 29.5-31.5 percent of CaO, 1.5-3.0 percent of MgO, 2.2- 3.0 percent of Al2O3, 0.5-1.5 percent of Fe2O3, 11.0-13.0 percent of Na2O, 10.0-12.0 percent of F-, 3.0-4.0 percent of C solid and the balance unavoidable impurity, wherein the binary basicity is 0.87 to 0.93; a melting point is 1050 to 1070 DEG C; and the viscosity below 1300 DEG C is 0.115Pa*S to 0.135Pa*S. In the practical application of the mold flux, a flame in a crystallizer is uniform; the spreadability is better; caking and agglomerating phenomena do not exist; a melt cinder is stable; the lubrication is sufficient; and the rate of the sticking steel breakouts can be decreased to below 5 percent from original 10 to 20 percent.

Description

technical field [0001] The invention relates to the technical field of continuous casting production technology, in particular to a continuous casting mold powder for reducing bonding breakout and a preparation method thereof. Background technique [0002] In the continuous casting process, the high-temperature molten steel first flows from the ladle into the tundish through the long nozzle, and then flows from the tundish into the mold through the submerged nozzle. In the crystallizer, due to the heat transfer between the molten steel and the copper plate of the mold, the molten steel solidifies into a billet shell with a certain thickness, and then under the action of mold vibration and billet drawing, the billet shell can be continuously pulled out of the mold and enters the Secondary cooling zone; If the liquid level fluctuates too much or the mold slag flows unevenly, etc., resulting in poor lubrication between the billet shell and the crystallizer, bonding will occur. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 李继王建伟
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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