Low-carbon ultra-low-carbon zirconium carbon refractory material for continuous casting submerged nozzle and preparation method of refractory material

A refractory material and immersion technology, which is applied in the field of refractory materials, can solve the problems of poor thermal shock resistance and corrosion resistance, and carbon cannot form continuous equalization, so as to reduce carbon content and thermal conductivity, good crystallization effect, and reduce The effect of production costs

Pending Publication Date: 2019-09-27
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the existing ZrO 2 Reducing the carbon content in -C refractories will make carbon unable to form a continuous phase or reduce the degree of continuity, which will inevitably lead to ZrO 2 -C refractories have poor thermal shock resistance and erosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A low-carbon and ultra-low-carbon zirconium-carbon refractory material for continuous casting submerged nozzles and a preparation method thereof. First pour 6wt% flake graphite into 7wt% thermosetting liquid phenolic resin and stir and mix for 10min, then add the mixture from the feed roller to the three-roll mill for three-roll differential circulation stripping (three rolls in the three-roll mill The speed ratio of the roller speed is N3 (feed roller): N2 (center roller): N1 (discharge roller) 1:2:4, the gap between the feed roller and the center roller is 0.08mm, the center roller and the discharge roller The gap between the rollers is 0.02 mm. After 15 cycles of peeling, the mixture of micro-nano graphite flakes formed by graphite peeling is collected from the discharge roller, and the mixture is uniformly dispersed in the resin, and it is heated in a water bath at 40 ° C for 25 minutes. Increase its fluidity, then mix the Si powder of fused zirconia fine powder 15w...

Embodiment 2

[0033] A low-carbon and ultra-low-carbon zirconium-carbon refractory material for continuous casting submerged nozzles and a preparation method thereof. First prepare 0.2wt% anhydrous nickel nitrate into an anhydrous alcohol solution with a mass percent concentration of 5wt%, pour the prepared nitrate alcohol solution into 3wt% thermoplastic liquid phenolic resin and stir for 10 minutes, then mix 1wt% The expanded graphite is poured into it and stirred and mixed for 15min to form a uniformly dispersed mixture; then the mixture is added to the three-roll grinder from the feed roll and carried out three-roll differential speed cycle stripping, and the speed ratio of the three-roll speed in the three-roll grinder is N3 (feed roller): N2 (center roller): N1 (discharge roller) 1:3:8, the gap between the feed roller and the center roller is 0.1mm, the gap between the center roller and the discharge roller is 0.01mm, after 10 cycles of stripping, collect the mixture of micro-nano gra...

Embodiment 3

[0036] A low-carbon and ultra-low-carbon zirconium-carbon refractory material for continuous casting submerged nozzles and a preparation method thereof. First the anhydrous iron nitrate of 0.1wt% and the anhydrous cobalt nitrate of 0.1wt% are formulated into the absolute alcohol solution that the mass percent concentration is 10wt%, pour the nitrate alcohol solution prepared into 5.8wt% thermoplastic liquid phenolic Stir and mix in the resin for 12 minutes, then pour 4wt% expanded graphite into it and stir and mix for 18 minutes to form a uniformly dispersed mixture; then add the mixture from the feed roller to a three-roll mill for three-roll differential cycle peeling, three-roll grinding The speed ratio of the three rolls in the machine is N3 (feed roll): N2 (center roll): N1 (discharge roll) 1:3:9, the gap between the feed roll and the center roll is 0.06mm, the center The gap between the roller and the discharge roller is 0.02 mm. After 20 cycles of peeling, the mixture o...

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Abstract

The invention discloses a low-carbon ultra-low-carbon zirconium carbon refractory material for a continuous casting submerged nozzle and a preparation method of the refractory material. The preparation method comprises the following steps: mixing a prepared nitrate anhydrous alcohol solution and phenolic resin; then pouring 0.1-6 wt% of scaly carbon thereinto and stirring for mixing; pouring a mixture into a three-roll grinder for performing differential circulating peeling 1-20 times, and collecting from a discharge roller to obtain a resin-based mixture of micro-nano graphite flakes; heating the resin-based mixture in a water bath of 40-90 DEG C for 5-30 min; putting ZrO2 particles and the heated resin-based mixture in a mixing mill for mixing for 3-15 min, finally adding ZrO2 fine powder and an antioxidant for continuous mixing for 4-15 min to prepare pug, and ageing a mixture for 1-24 h; then preparing into green bricks; roasting and curing in a drying kiln at the temperature of 140-300 DEG C for 7-36 h; then performing carbon sequestration treatment at 1300-1600 DEG C for 2-12 h to obtain the refractory material. According to the low-carbon ultra-low-carbon zirconium carbon refractory material disclosed by the invention, carbon content can be substantially reduced on the basis of maintaining/improving the comprehensive property of the ZrO2-C refractory material.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a low-carbon and ultra-low-carbon zirconium-carbon refractory material for continuous casting submerged nozzles and a preparation method thereof. Background technique [0002] The submerged nozzle is to immerse the nozzle under the liquid steel surface in the crystallizer, as a pouring pipe, it is a channel for molten steel to enter the crystallizer from the tundish. It not only protects the steel flow, prevents secondary oxidation of molten steel, and promotes the floating of inclusions, but also changes the flow state of molten steel in the crystallizer. The quality and production capacity of continuous casting play an important role. Due to the existence of the molten glass layer on the steel surface inside the mold, the molten glass layer contains CaO, SiO 2 、Na 2 O, K 2 O, etc., will severely corrode Al in the submerged nozzle material 2 o 3 , SiO 2 , C, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/482C04B35/80
CPCC04B35/806C04B35/482C04B2235/425C04B2235/443C04B2235/402C04B2235/428C04B2235/3804C04B2235/3821C04B2235/386C04B2235/3813C04B2235/3427C04B2235/3246C04B2235/5248C04B2235/5288C04B2235/9676C04B2235/77C04B2235/96
Inventor 黄军同胡智辉李喜宝闫明格熊庆明陈智
Owner NANCHANG HANGKONG UNIVERSITY
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