Method for preparing hydration resistant calcia material

A technology of anti-hydration and calcium oxide, which is applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problem of difficult to obtain calcium oxide materials with anti-hydration properties, high porosity of sintered agglomerates, and reduced material Use performance and other issues to achieve the effect of being conducive to large-scale industrial production, good hydration resistance, and improving production efficiency

Inactive Publication Date: 2009-06-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, calcium oxide and alumina can form low-melting point phases and reduce the performance of materials, so they are less used in actual production at present.
In addition, the greater the density of the calcium oxide material, the better the anti-hydration effect, but the pure calcium oxide material has a high closed porosity and a low relative density due to the abnormal growth of the grains in the middle and later stages of the sintering process. , It is difficult to produce calcium oxide materials with good hydration resistance when calcined below 1700 °C

Method used

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  • Method for preparing hydration resistant calcia material

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Experimental program
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Effect test

Embodiment 1

[0027] Calcium carbonate powder with an average particle size of 1 μm is used as raw material, 5 mol% of yttrium oxide powder with an average particle size of 1 μm is added, the raw materials are fully mixed with an agate mortar, and then molded with a metal mold under a pressure of 100 MPa. Then place the sample on MoSi 2 The microstructure can be obtained by heating at 1600°C for 5 hours in a resistance furnace, such as figure 1 The relative density of the second phase coated calcium oxide particles shown is 97% calcium oxide material.

Embodiment 2

[0029] Add 1mol% yttrium nitrate to calcium nitrate, then add the mixed reagent into the alcohol aqueous solution with alcohol-water ratio of 5:1 and dissolve completely. Under the condition of vigorous stirring, slowly heat to 75°C and keep for a period of time, then slowly add ammonia water dropwise until the pH value of the solution is greater than 9. After cleaning with deionized water and alcohol, the obtained material is completely dried and then calcined at 400° C. to obtain nanoscale powder. The powder is molded under a pressure of 100 MPa with a metal mold. Then place the sample on MoSi 2 By heating at 1500°C for 2 hours in a resistance furnace, a calcium oxide material with a relative density of 97% and a second-phase coating structure can be obtained.

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Abstract

The invention relates to material preparation technology, in particular to a method for preparing a hydration-resistance calcium oxide material. The method obtains a calcium oxide material which has the advantages such as excellent hydration-resistance performance and high density by adding 0 to 30mol percent additives containing nickel, yttrium or ytterbium or other elements and adopting a proper sintering mode. The microstructure of the material has the characteristics of coating a layer of second phrase with excellent hydration-resistance performance on the surfaces of calcium oxide grains, along with high density and good heat and shock resistant performance. The technology has the characteristic that the calcium oxide material of which the granular surfaces have hydration-resistance coatings is obtained by adding the additives and adopting a proper sintering system, and that the material has high density, excellent heat and shock resistant performance and so on. In addition, the method is low in sintering temperature, energy-saving and environmentally-friendly, simple in process and favorable for large-scale production and improves production efficiency.

Description

Technical field: [0001] The invention relates to a material preparation technology, in particular to a preparation method of a hydration-resistant calcium oxide material. Background technique: [0002] Limestone is quite abundant in resources and is the cheapest refractory raw material. In addition, calcium oxide is one of the most stable oxides and hardly reacts with various molten metals. Compared with other materials, calcium oxide is much less reduced by active alloying elements at the melting temperature of metals and alloys. Calcium oxide material also has the advantages of high refractoriness, low decomposition pressure and vapor pressure, good thermal shock resistance and slag resistance, and is one of the best materials for preparing crucibles, filters and nozzles. Therefore, for decades, people have been trying to apply calcium oxide refractories to the metallurgical and ceramic industries on a large scale, but no breakthrough has been made. [0003] Studies hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02
Inventor 戴文斌王新丽赵鹏于景坤
Owner NORTHEASTERN UNIV
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