Method for preparing hydration-resistant and thermal-shock-resistant calcium oxide crucible by dry process

A calcium oxide crucible and thermal shock resistance technology, applied in the field of oxide refractory materials for high-temperature smelting, can solve the problems of low purity of calcium oxide, easy cracking of calcium oxide crucible, metal or alloy impurities, etc., and achieve good crucible strength and additive distribution. The effect of uniform and lower sintering temperature

Active Publication Date: 2016-08-17
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the technical problems existing in the above-mentioned prior art, the present invention, on the basis of the prior art, provides a method for preparing a dry-process calcium oxide crucible that is resistant to hydration and thermal shock. The calcium oxide crucible prepared by the present invention has strong Anti-hydration and thermal shock resistance, and can solve the technical problems that the calcium oxide in the calcium oxide crucible is low in purity, easy to introduce impurities into the smelted metal or alloy, and the calcium oxide crucible is easy to crack

Method used

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  • Method for preparing hydration-resistant and thermal-shock-resistant calcium oxide crucible by dry process
  • Method for preparing hydration-resistant and thermal-shock-resistant calcium oxide crucible by dry process
  • Method for preparing hydration-resistant and thermal-shock-resistant calcium oxide crucible by dry process

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Embodiment 1

[0035] A method for preparing a hydration-resistant, thermal-shock-resistant dry-process calcium oxide crucible, comprising the following steps:

[0036] Step 1, crushing and refining quicklime lumps with a calcium oxide purity greater than 96% to obtain quicklime fines with a particle size of less than 2mm;

[0037] Step 2, uniformly mix the above-mentioned quicklime fines and additives to obtain a 2kg mixture, wherein the quicklime fines account for 91.9% of the total mass percentage of the mixture, and the additives include the following components accounting for the total mass percentage of the mixture, 3% fluorinated Calcium, 3.5% zirconium dioxide, 1% titanium dioxide, 5‰ of boric acid and 1‰ of chromium trioxide; then, the mixture is pressed twice with a press, and the head pressure value of the press for the first time is is 16MPa, the pressure head pressure value of the second press is 12MPa, and the mixture is pressed into brick-shaped products of 2kg each;

[0038]...

Embodiment 2

[0044] A method for preparing a hydration-resistant, thermal-shock-resistant dry-process calcium oxide crucible, comprising the following steps:

[0045] Step 1, crushing and refining quicklime lumps with a calcium oxide purity greater than 96% to obtain quicklime fines with a particle size of less than 2 mm;

[0046] Step 2, uniformly mix the above-mentioned quicklime fines and additives to obtain a 2kg mixture, wherein the quicklime fines account for 91.5% of the total mass percentage of the mixture, and the additives include the following components accounting for the total mass percentage of the mixture, 1% calcium fluoride , 3% zirconium dioxide, 4% titanium dioxide, 2‰ of boric acid and 3‰ of chromium trioxide; 16MPa, the pressure head pressure value of the second press is 19MPa, and the mixture is pressed into brick-shaped products of 2kg each;

[0047] Step 3: Place the brick-shaped products neatly in the temperature-controlled electric furnace, and perform the first ...

Embodiment 3

[0053] A method for preparing a hydration-resistant, thermal-shock-resistant dry-process calcium oxide crucible, comprising the following steps:

[0054] Step 1, crushing and refining quicklime blocks with a calcium oxide purity greater than 98%, to obtain quicklime fines with a particle size of less than 2mm;

[0055] Step 2, uniformly mix the above-mentioned quicklime fines and additives to obtain a 2.25kg mixture, wherein the quicklime fines account for 91.2% of the total mass percentage of the mixture, and the additives include the following components accounting for the total mass percentage of the mixture, 4% fluorine calcium oxide, 4.5% zirconium dioxide, 3‰ of boric acid and 5‰ of chromium trioxide; The head pressure value of the secondary press is 15MPa, and the mixture is pressed into brick-shaped products of 2.25kg each;

[0056] Step 3: Place the brick-shaped products neatly in the temperature-controlled electric furnace, and perform the first temperature-controll...

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Abstract

The invention discloses a method for preparing a hydration-resistant and thermal-shock-resistant calcium oxide crucible by a dry process. The method comprises the following steps: purifying quicklime lumps, and crushing and fining the quicklime lumps with calcium oxide purity higher than 96%; mixing the quicklime fines with additives so as to form a mixture, and then, pressing the mixture into brick-shaped products; carrying out first-time temperature-controlled sintering on the brick-shaped products; crushing the sintered material obtained after first-time sintering, carrying out screening, then, carrying out proportioning proportionally, and carrying out uniform mixing so as to form clinker; loading the clinker obtained through carrying out uniform mixing in the step (4) to a crucible die, carrying out compaction on a vibrating platform, and carrying out pressing by a cold isostatic press; and putting a calcium oxide crucible green body in an electric furnace, carrying out second-time temperature-controlled sintering according to a secondary temperature-control curve, thereby obtaining a calcium oxide crucible product. The calcium oxide crucible prepared by using the method has the advantages that the hydration resistance is higher, the thermal-shock resistance is better, the sintering is denser, and the strength of the crucible is good.

Description

【Technical field】 [0001] The invention relates to the technical field of oxide refractories for high-temperature smelting, in particular to a method for preparing a dry-process calcium oxide crucible resistant to hydration and thermal shock. 【Background technique】 [0002] At present, the demand for ultra-clean metals and alloys is increasing day by day. In the field of vacuum contacts, a large number of copper-chromium alloys and copper-tungsten alloys with excellent electrical and mechanical properties are needed. In aerospace, medical and other fields, titanium alloys and memory alloys are needed. In the crucible mold industry, Ultra-clean steel and special steel are required in oil pipelines. [0003] In order to meet the needs of the above fields, it is necessary to improve the purity and performance of metals and alloys during material processing. In many cases, vacuum induction furnaces are used for smelting and purification, and the crucibles used are mostly graphite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/057C04B35/63
CPCC04B35/057C04B35/6303C04B35/66C04B2235/5427C04B2235/445C04B2235/3232C04B2235/3244C04B2235/3241
Inventor 张峰
Owner XI'AN PETROLEUM UNIVERSITY
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