阅读说明：本技术 高纯烧结尖晶石的制备方法 (Preparation method of high-purity sintered spinel ) 是由 颜林 叶青 邵长波 李桂梅 于 2019-11-13 设计创作，主要内容包括：本发明公开了高纯烧结尖晶石的制备方法,包括以下步骤；步骤一：选用高纯度氧化铝和氧化镁为原料；步骤二：取下述配比进行混合：氧化铝70-80%,氧化镁20-30%；步骤三：将混合后的氧化铝及氧化镁放入球磨机内进行球磨；步骤四：将步骤三中球磨后的颗粒放入成球机内进行成球；步骤五：成球后的颗粒经过干燥塔进行干燥；步骤六：将颗粒投入竖窑中进行烧结；竖窑内温度为1850--1900℃；本发明通过竖窑烧结解决了现有技术中,电容烧结时容易出现的成品不稳定的问题；增加了生产效率；另外,采用高纯度氧化铝及高纯度氧化镁作为原料,提升了产出的尖晶石的质量,进而所做成的耐火材料性能有了质的提升,能在超高温邻域应用。(The invention discloses a preparation method of high-purity sintered spinel, which comprises the following steps; the method comprises the following steps: selecting high-purity aluminum oxide and magnesium oxide as raw materials; step two: mixing the following components in proportion: 70-80% of aluminum oxide and 20-30% of magnesium oxide; step three: putting the mixed alumina and magnesia into a ball mill for ball milling; step four: putting the ball-milled particles in the third step into a ball forming machine for ball forming; step five: drying the pelletized particles in a drying tower; step six: putting the particles into a shaft kiln for sintering; the temperature in the vertical kiln is 1850 to 1900 ℃; the invention solves the problem of unstable finished products easily occurring in the capacitor sintering process in the prior art through shaft kiln sintering; the production efficiency is increased; in addition, high-purity aluminum oxide and high-purity magnesium oxide are used as raw materials, the quality of the produced spinel is improved, the performance of the made refractory material is improved qualitatively, and the high-purity magnesium oxide can be applied to ultrahigh temperature regions.)

1. The preparation method of the high-purity sintered spinel is characterized by comprising the following steps: comprises the following steps;

the method comprises the following steps: selecting high-purity alumina and high-purity magnesium oxide as raw materials;

step two: mixing the following components in proportion: 70-80% of aluminum oxide and 20-30% of magnesium oxide;

step three: putting the mixed alumina and magnesia into a ball mill for ball milling;

step four: putting the ball-milled particles in the third step into a ball forming machine for ball forming;

step five: drying the pelletized particles in a drying tower;

step six: and putting the dried particles into a shaft kiln for sintering.

2. The method for preparing a high purity sintered spinel according to claim 1, wherein: in the first step, the purity of the alumina and the magnesia is more than 99.8 percent.

3. The method for preparing a high purity sintered spinel according to claim 1, wherein: mixing the following components in proportion in the second step: 78% of aluminum oxide and 22% of magnesium oxide.

4. The method for preparing a high purity sintered spinel according to claim 1, wherein: and step three, ball milling the particles to 8-10 microns.

5. The method for preparing a high purity sintered spinel according to claim 1, wherein: the ball forming machine in the fourth step is a roller type ball forming machine.

6. The method for preparing a high purity sintered spinel according to claim 1, wherein: the temperature in the drying tower in the step five is 300-400 ℃.

7. The method for preparing a high purity sintered spinel according to claim 1, wherein: the temperature in the vertical kiln in the step six is 1850-1900 ℃, and the sintering time is 8 hours.

Technical Field

The invention belongs to the technical field of material preparation, and particularly relates to a preparation method of high-purity sintered spinel.

Background

The magnesia-alumina spinel refractory material has the advantages of high use temperature, good slag corrosion resistance, easy obtainment of raw materials and the like, and has wide application in the aspects of ladle refining furnaces, RH refining furnaces, cement and lime calcination rotary kiln burning zones, non-ferrous metal smelting and other thermal equipment; in the past, people mainly pay attention to the service life of a high-temperature kiln lining and the consumption of refractory materials of a ton product, so that materials with good erosion resistance and longer service life need to be selected; with the energy crisis becoming one of the most important global problems, energy conservation and consumption reduction become one of the main control and assessment indexes of governments and enterprises.

The key for developing high-quality magnesia-alumina spinel is the preparation of high-purity magnesia-alumina spinel powder, while the existing preparation method ignores the problem of the purity of the powder although the process is mature. And are often not suitable for high temperature applications. The purity of the spinel-type crystal phase not only includes high purity of chemical components, but also includes purity of crystal phase after the spinel phase is fired. The high-purity sintered spinel prepared by the method has a crystal phase which is a spinel phase completely, and has no other impurity phase. The purity of the crystal phase ensures high-temperature service performance.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for preparing a high purity sintered spinel.

In order to achieve the purpose, the invention provides the following technical scheme:

the preparation method of the high-purity sintered spinel is characterized by comprising the following steps: comprises the following steps;

the method comprises the following steps: selecting high-purity aluminum oxide and magnesium oxide as raw materials;

step two: mixing the following components in proportion: 70-80% of aluminum oxide and 20-30% of magnesium oxide;

step three: putting the mixed alumina and magnesia into a ball mill for ball milling;

step four: putting the ball-milled particles in the third step into a ball forming machine for ball forming;

step five: drying the pelletized particles in a drying tower;

step six: and putting the dried particles into a shaft kiln for sintering.

According to the preparation method of the high-purity sintered spinel, the purity of the alumina and the purity of the magnesia in the step I reach more than 99.8%.

The preparation method of the high-purity sintered spinel comprises the following steps of mixing: preferably, the aluminum oxide is 78 percent, and the magnesium oxide is 22 percent

In the preparation method of the high-purity sintered spinel, the particles in the step three are ball-milled to 8-10 microns.

In the preparation method of the high-purity sintered spinel, the granulator in the fourth step is a roller type granulator.

In the preparation method of the high-purity sintered spinel, the temperature in the drying tower in the step five is 300-400 ℃.

The preparation method of the high-purity sintered spinel has the temperature in the shaft kiln in the sixth step of 1850-1900 ℃ and the sintering time of 8 hours.

The invention solves the problem of unstable finished products easily occurring in the capacitor sintering process in the prior art through shaft kiln sintering; the production efficiency is greatly improved; by adopting high-purity aluminum oxide and high-purity magnesium oxide as raw materials, the quality of the produced spinel is greatly improved, and the performance of the prepared refractory material is obviously improved; the spinel prepared by the method has high chemical components and high crystal phase purity.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart of the present invention.

Fig. 2 is an XRD pattern of the high purity sintered spinel of the present invention.

FIG. 3 is a Scanning Electron Microscope (SEM) image of a high purity sintered spinel according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a method for preparing high purity sintered spinel, which is characterized in that: comprises the following steps;

the method comprises the following steps: selecting high-purity aluminum oxide and magnesium oxide as raw materials;

step two: mixing the following components in proportion: 70-80% of aluminum oxide and 20-30% of magnesium oxide; preferably, 78% of aluminum oxide and 22% of magnesium oxide;

step three: putting the mixed alumina and magnesia into a ball mill for ball milling; ball milling to 8-10 micron size particle;

step four: putting the ball-milled particles in the third step into a ball forming machine for ball forming; the ball forming machine is a roller type ball forming machine;

step five: drying the pelletized particles in a drying tower; the temperature in the drying tower is 300-400 ℃;

step six: putting the dried particles into a shaft kiln for sintering; the temperature in the shaft kiln is 1850 to 1900 ℃, and the sintering time is 8 hours.

Of course, the above description is not limited to the above examples, and the undescribed technical features of the present invention can be implemented by or using the prior art, and will not be described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present invention and not for limiting the present invention, and the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and shall also fall within the scope of the claims of the present invention.