Method for producing hydration-resistant high-purity calcium oxide crucible

A calcium oxide crucible and hydration resistance technology, applied in the field of refractory materials for high temperature smelting, can solve the problems of smelting metals and alloys introducing impurities, short service life, easy hydration, etc., so as to reduce thermal shock resistance and improve resistance to The effect of improved hydration, hydration resistance and thermal shock resistance

Inactive Publication Date: 2013-06-26
SHENYANG XINJIN POWDER ENG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The present invention aims to solve the common problems in the present calcium oxide crucibles that when the purity of calcium oxide in the crucible is low, impurities are easily introduced into the smelted metal and alloy. When the purity of calcium oxide is high, the crucible is very easy to hydrate, easy to crack during repeated use, and has a short service life. Technical problem, a preparation method of a hydration-resistant high-purity calcium oxide crucible is provided

Method used

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  • Method for producing hydration-resistant high-purity calcium oxide crucible
  • Method for producing hydration-resistant high-purity calcium oxide crucible
  • Method for producing hydration-resistant high-purity calcium oxide crucible

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preparation example Construction

[0010] A preparation method of anti-hydration high-purity calcium oxide crucible adopts the following technical solutions:

[0011] a. The calcium carbonate with a purity greater than 98% is fused to obtain calcium oxide sand. After crushing, it is sieved and mixed evenly according to the following particle size and weight ratio:

[0012] <0.5mm 20-35%;

[0013] 0.5-1mm 15-25%;

[0014] 1-2mm 30-45%;

[0015] 2-4mm 5-10%.

[0016] b. Take the 92-98% graded calcium oxide sand and the zirconia powder with a particle size of 100-200μm and a mass ratio of 2-8% and mix well;

[0017] c. Add 3-10% anhydrous binder of the total weight of the above powder, wherein the anhydrous binder can be one or more of paraffin, ethanol, and 10% by weight calcium chloride ethanol solution; After being evenly mixed, pour it into a mold of corresponding size and place it on a vibrating table to vibrate; place the mold into cold isostatic pressing at a pressure of 180MPa-200MPa to form a calcium oxide crucible ...

Embodiment 1

[0020] The realization steps of the preparation method of the anti-hydration high-purity calcium oxide crucible:

[0021] a. The calcium carbonate with a purity greater than 98% is fused to obtain calcium oxide sand. After crushing, it is sieved and mixed evenly according to the following particle size and weight ratio:

[0022]

[0023] b. Take 96% graded calcium oxide sand and 4% zirconia powder with a particle size of 100-200μm and mix it evenly;

[0024] c. Add 6% paraffin wax based on the total weight of the powder. After mixing evenly, pour it into a mold of corresponding size, and place it on a vibrating table to vibrate. The mold is put into cold isostatic pressure and pressed to form a calcium oxide crucible body at a pressure of 180 MPa.

[0025] d. Heat the calcium oxide crucible body in a high temperature furnace at 15°C per minute to 500°C for 4 hours, then at 10°C per minute to 1200°C for 4 hours, and then at 10°C per minute to 1500°C for heat preservation 3 hours, and...

Embodiment 2

[0027] The realization steps of the preparation method of the anti-hydration high-purity calcium oxide crucible:

[0028] a. The calcium carbonate with a purity greater than 98% is fused to obtain calcium oxide sand. After crushing, it is sieved and mixed evenly according to the following particle size and weight ratio:

[0029]

[0030] b. Take 92% graded calcium oxide sand and 8% zirconia powder with a particle size of 100-200μm and mix well;

[0031] c. Add 8% ethanol of the total weight of the above powder. After evenly mixing, pour it into a mold of corresponding size, and place it on a vibrating table to vibrate. The mold is put into cold isostatic pressure and pressed at a pressure of 200 MPa to obtain a calcium oxide crucible body.

[0032] d. Heat the calcium oxide crucible body in a high temperature furnace at 15°C per minute to 450°C for 2 hours, then at 10°C per minute to 1100°C for 1 hour, and then at 10°C per minute to 1400°C for heat preservation 4 hours, and finally ...

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Abstract

The invention relates to a method for producing a hydration-resistant high-purity calcium oxide crucible, which is designed for solving the technical problems that low purity of calcium oxide generally existing in the existing calcium oxide crucible easily results in the introduction of impurities into melting metal and alloy; high purity of calcium oxide results in the easy hydration of the crucible and easy cracking of the crucible during use, the service life of the crucible is short and so on. According to the method, high-purity calcium carbonate is electrically molten to obtain calcium oxide clinker which is then crushed to appropriate sizes and subsequently subject to combined gradation; the graded calcium oxide clinker is mixed with zirconia powder, then an anhydrous binder is added in the mixed powders; and a calcium oxide crucible blank is obtained by cold isostatic pressing, and then is sintered to obtain the hydration-resistant high-purity calcium oxide crucible. The method has the advantages that the performanceof metal or alloy smelted in a vacuum induction furnace with the hydration-resistant high-purity calcium oxide crucible as the liner surpasses that of the graphite crucible, the hydration resistance and the thermal shock resistance are improved, and the sintering temperature of calcium oxide is lowered; cold isostatic pressing forming is adopted so that the crucible forming is more convenient and simpler; the crucible is widely applied to the vacuum smelting industry due to the characteristics of high purity and good mechanical performance.

Description

Technical field: [0001] The invention relates to a method for preparing a crucible for vacuum melting of ultra-pure metals and alloys, and belongs to the technical field of refractory materials for high-temperature melting. Background technique: [0002] At present, the demand for ultra-pure metals and alloys is increasing. In order to improve the purity of metals and alloys, vacuum induction furnaces are generally used for smelting and purification. The crucibles used are mostly graphite crucibles, and the smelted metals and alloys are very easy to infiltrate a large amount of carbon, which in turn affects its purity and mechanical properties. Nowadays, calcium oxide crucibles are commonly used in advanced smelting to replace graphite crucibles. Calcium oxide crucibles are very effective for removing O, N, S and other elements during purification. However, a common phenomenon in calcium oxide crucibles is that the low purity of calcium oxide in the crucible can easily introduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 赵明韩绍娟许壮志薛健张明吴学坤
Owner SHENYANG XINJIN POWDER ENG
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