Quartz nozzle and preparation process thereof

A preparation process, quartz technology, applied in the field of ceramics, can solve the problems of frequent replacement, short service life, over-speeding of pouring mud settlement, etc., to achieve the effects of improving production efficiency, increasing service life and reducing costs

Pending Publication Date: 2022-02-01
YANTAI HEJING CERAMIC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, my country's fused silica nozzles are still basically produced using the traditional ceramic grouting production process. However, in actual production, many problems such as excessive sedimentation of pouring mud and uneven firing are prone to occur, which makes the strength of the manufactured nozzles insufficient. , short service life, frequent replacement, increased production costs, and reduced the quality of steel casting products

Method used

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  • Quartz nozzle and preparation process thereof

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Effect test

Embodiment 1

[0020] A preparation process for a quartz nozzle is provided in Embodiment 1 of the present invention, comprising the following steps:

[0021] The first step: to make quartz slurry, put quartz sand and water into a ball mill equipped with ball stones in a ratio of (3-4): 1, and perform ball milling for 20-30 hours to obtain quartz grinding slurry, in which quartz sand is molten Quartz sand in the state of 30-50 mesh or 100-200 mesh or 300-400 mesh in particle size; directly feed quartz sand with particle size of 300-400 mesh, dispersant, ceramic adhesive, inorganic fiber Stir according to the ratio of 200:(100-150):1:(1-2):(40-50) to obtain quartz slurry.

[0022] Among them, the diameter of the inorganic fiber is 80-200um, and the length is 40-100mm. Alumina, silicon carbide, silicon dioxide, carbon, etc. can be selected, and one or more of them can be used in combination. The timing of adding is ball milling of slurry. And after the high-speed stirring stage, specifically,...

Embodiment 2

[0028] A preparation process for a quartz nozzle is provided in Embodiment 2 of the present invention, comprising the following steps:

[0029] The first step: making a gel system, using low-toxic N,N'-dimethylacrylamide as a monomer, N,N'-methylenebisacrylamide as a crosslinking agent, and ammonium persulfate as an initiator. According to monomer, cross-linking agent, initiator, water in the ratio of (20-60): (1-3): (1-2): 400 to prepare a gel system.

[0030] The second step: to make quartz slurry, put quartz sand and water into a ball mill equipped with ball stones in a ratio of (3-4): 1, and perform ball milling for 20-30 hours to obtain quartz grinding slurry, in which quartz sand is molten Quartz sand in the state of 30-50 mesh or 100-200 mesh or 300-400 mesh in particle size; directly feed quartz sand with particle size of 300-400 mesh, gel system, dispersant, ceramic adhesive The agent and the inorganic fiber are stirred according to the ratio of 200:(100-150):(30-40)...

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Abstract

The invention relates to a quartz nozzle and a preparation process thereof. The preparation process comprises the following steps: preparation of quartz slurry, addition of inorganic fibers, molding of a quartz nozzle green body, demolding, finishing, maintenance and high-temperature sintering. Wherein the inorganic fibers are added at the stirring end stage or the bubble removal stage, and the inorganic fibers are slowly added into the slurry at a constant speed in a vibration feeding manner until the inorganic fibers are uniformly stirred. The quartz nozzle provided by the invention has obvious advantages in the aspects of compressive strength, density, elasticity modulus and thermal shock resistance stability, the service life of the quartz water gap is obviously prolonged, and the quartz water gap is of great significance for reducing the cost and improving the production benefit of an enterprise.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a quartz nozzle and a preparation process thereof. Background technique [0002] The nozzle is an important part used in the steel casting process. It mainly plays the role of conveying molten steel, preventing secondary oxidation, dispersion and splashing of molten steel, adjusting the flow state of molten steel in the crystallizer, and preventing non-metallic inclusions from being mixed into the slab. In the process of continuous casting of iron and steel, the quality of the nozzle not only directly affects the quality and output of continuous casting slabs, but also relates to the labor intensity of continuous casting operators. The nozzles currently used are mostly aluminum carbon and fused quartz materials. The aluminum carbon nozzle is made of corundum and graphite, and it needs to be preheated before use, which is prone to cracks. The quartz nozzle has good thermal shoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/14B22D41/50
CPCC04B35/66C04B35/14B22D41/50C04B2235/5224C04B2235/5244C04B2235/5232C04B2235/5248C04B2235/5436C04B2235/5427C04B2235/6022C04B2235/656C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607
Inventor 李健刘丽丽高源
Owner YANTAI HEJING CERAMIC NEW MATERIALS
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