Method for preparing high-purity hydration-resisting calcium oxide crucible

A calcium oxide crucible and hydration resistance technology, applied in the field of ceramic materials, can solve the problems of easy hydration, easy pollution and low purity of the crucible, so as to improve the hydration resistance, improve the use temperature and service life, and the process flow is simple. Effect

Inactive Publication Date: 2016-08-31
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a high-purity hydration-resistant calcium oxide crucible, so as to solve the common problems that the current calcium oxide crucibles are easy to hydrate when the purity is high, and easy to pollute when the purity is low.

Method used

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Embodiment

[0029] The invention provides a novel method for preparing a calcium oxide crucible, the flow process mainly comprising the following steps:

[0030] (1) In high-purity calcium hydroxide (Ca(OH) 2 ) Add 1.5-8wt.% yttrium oxide to the powder, and perform ball milling, and then dry the ball-milled material; the ball milling time is 48-60h;

[0031] (2) Press the dried material into a block under a pressure of 40-80 MPa, and then calcinate at 1680°C for 2-4 hours to obtain a sintered material;

[0032] (3) Crushing the sintered material and screening according to the following particle size and weight percentage:

[0033] 1~3mm: 30~55wt.%

[0034] 40 mesh ~ 1mm: 10 ~ 30wt.%

[0035] -40 mesh: 30~45wt.%;

[0036] (4) Mix the sieved materials, then add an anhydrous binder whose weight is 2-6% of the total weight of the mixed materials, mix them evenly and put them into the crucible mold;

[0037] (5) Vibrate the material in the dry pot mold, and then carry out cold isostatic p...

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Abstract

The invention discloses a method for preparing a high-purity hydration-resisting calcium oxide crucible, wherein the method includes the steps: (1) adding yttrium oxide in a high-purity calcium hydroxide powder, carrying out ball milling, and then drying; (2) pressing the dried material into blocks, and then calcining to obtain a sintered material; (3) crushing and screening the sintered material; (4) mixing the screened material, then adding an anhydrous binder, mixing evenly, and then placing the mixture into a crucible mold; (5) vibrating to compact the material in the crucible mold, then carrying out cold isostatic pressing, and carrying out compression molding of the material, to obtain a calcium oxide crucible blank; and (6) sintering the calcium oxide crucible blank, to obtain the calcium oxide crucible. The prepared calcium oxide crucible has good thermal shock resistance and relatively high service life, better solves the problems that a conventional calcium oxide crucible is easy to hydrate when the purity is high and has impurities easily introduced to pollute melted metals and alloys when the purity is low, and is widely applied in pure steel and ultra-pure metal smelting.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a method for preparing a high-purity hydration-resistant calcium oxide crucible. Background technique [0002] In recent years, with the development of the economy, the industry has higher requirements for pure steel and ultra-pure metal smelting technology. With its excellent thermodynamic stability, excellent impurity removal and good slag resistance, CaO material has become a refractory material favored by high-purity metal smelting. However, the CaO material has the disadvantage of easy hydration, which limits its application to a certain extent. [0003] As for the research on the anti-hydration of CaO, the current main method is to add substances that react with CaO to form a liquid phase at high temperature to coat calcium oxide, thereby improving the anti-hydration property of CaO, such as CuO, V 2 o 5 , Fe 2 o 3 、Cr 2 o 3 Wait. Due to the formation of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/057C04B35/626C04B35/64C04B35/63C04B35/634
CPCC04B35/057C04B35/62615C04B35/62645C04B35/6303C04B35/63488C04B35/66C04B2235/3225C04B2235/5427C04B2235/602C04B2235/9669
Inventor 汪彩芬李恩军王威李先容张悦徐俊张向东
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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