Preparation method of low-sodium and high-activity special alpha-Al2O3 micro powder

A high-activity, micro-powder technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of unfavorable industrialization promotion, cumbersome process flow, and low yield, and achieve reasonable particle size distribution, high chemical purity, and transformation high rate effect

Inactive Publication Date: 2019-10-18
苏州盛曼特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned several preparation processes all have cumbersome technological process and low yield. For industry, it is more difficult to realize, which is not conducive to industrialization promotion

Method used

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  • Preparation method of low-sodium and high-activity special alpha-Al2O3 micro powder
  • Preparation method of low-sodium and high-activity special alpha-Al2O3 micro powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First, ammonium chloride and aluminum fluoride are mixed according to weight 10:1 to obtain mineralizer K1; industrial alumina (25% content under 325 mesh sieve, BET=70m 2 / g,Na 2 O=0.45%) and mineralizer K1 were placed in a high-performance mixer (Eirich brand, RV24 type) and mixed for 20 minutes according to the weight ratio of 100:1, and the mixer speed was 100 rpm to obtain the mixture S1-1 ; Place S1-1 in a high-temperature furnace for high-temperature calcination. The temperature rise curve of the high-temperature furnace is set at 10°C / min, the temperature is raised to 1100°C, and the temperature is kept at this temperature for 1 hour; after natural cooling, the calcined material is placed in In the ball mill, the ratio of ball to material is 8:1, the weight ratio of grinding balls with different diameters is 40mm:30mm:20mm=2:7:1, the diameter of the mill is 30cm, the diameter is 50cm, and the set speed is 60 rpm. The milling time is 10 hours, and the active α-A...

Embodiment 2

[0040] Ammonium chloride and aluminum fluoride are mixed according to weight ratio 10:1.5 to obtain mineralizer K2; Industrial alumina (content 25% under 325 mesh sieves, BET=68m 2 / g,Na 2 O=0.49%) and mineralizer K2 according to the weight ratio are 100:1.5 and are placed in the high-performance mixer (Ei Lixu brand, RV24 type) and mix the materials for 20 minutes, the mixer speed is 100 rpm, and the mixture S1-2 is obtained. ; The mixture S1-2 is placed in a high-temperature furnace for calcination, the temperature rise curve of the high-temperature furnace is set at 10°C / min, the temperature is raised to 1200°C, and the temperature is kept at this temperature for 2 hours; after natural cooling, the calcined material is placed in In the ball mill, the ratio of ball to material is 8:1, the weight ratio of grinding balls with different diameters is 40mm:30mm:20mm=2:7:1, the diameter of the mill is 30cm, the diameter is 50cm, and the set speed is 60 rpm , the milling time was ...

Embodiment 3

[0043] Ammonium chloride and aluminum fluoride are mixed according to weight ratio 10:2 to obtain mineralizer K3; 2 / g,Na 2 O=0.36%) and mineralizer K3 weight ratio is 100:2 and is placed in high-performance mixer (Ei Lixu brand, RV24 type) and carries out mixing 20 minutes, and mixer speed 100 revs / min, obtains mixture S1-3 ;Put the mixture S1-3 in a high-temperature furnace for calcination, set the temperature rise curve of the high-temperature furnace at 10°C / min, raise the temperature to 1150°C, and keep it at this temperature for 1.5 hours; after natural cooling, the calcined alumina Put it in a ball mill, the ratio of ball to material is 8:1, the weight ratio of grinding balls with different diameters is: 40mm:30mm:20mm=2:7:1, the diameter of the grinder is 30cm, the diameter is 50cm, and the set speed is 60 rpm / min, the grinding time is 5 hours; the final active α-Al 2 o 3 Micronized R-03.

[0044] Active α-Al in this example 2 o 3 Micronized D 50 =1.6μm, the sp...

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Abstract

The invention discloses a preparation method of low-sodium and high-activity special alpha-Al2O3 micro powder. The preparation method comprises the steps that aluminum hydroxide or industrial aluminaserves as main raw materials, and ammonium chloride and aluminum fluoride serve as a mineralizer; the aluminum hydroxide or the industrial alumina and the mineralizer are mixed, a mixture is subjectedto high-temperature calcination to prepare low-sodium and high-specific-surface-area alpha-Al2O3 raw powder, the alpha-Al2O3 raw powder is placed into a ball mill for grinding, and the alpha-Al2O3 micro powder is prepared. According to the preparation method, the raw materials are wide in source, sodium removal is conducted through the ammonium chloride and aluminum fluoride composite mineralizer, the whole technology is completed through one step, neither a drying technology after acid pickling and nor silicon sand screening with silicon sodium removal is not needed, the overall cost is low,boric oxide and silicon dioxide do not remain in a final product, the alpha-Al2O3 micro powder is high in chemical purity, low in sodium oxide content, high in specific surface area and high in activity, the alpha-aluminum oxide conversion rate is greater than or equal to 96.0%, and grain size distribution is reasonable.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic non-metallic materials, in particular to a low-sodium high-activity special α-Al 2 o 3 The preparation method of micropowder is applied in the fields of refractory materials and functional ceramics. Background technique [0002] Low Sodium High Activity α-Al 2 o 3 Micropowder is an important raw material for refractory materials and ceramic matrix. Its chemical purity and activity index directly determine the high temperature performance and service life of refractory materials and functional ceramics in the later service process. Generally, products with a sodium oxide content of less than 0.15% can be called low-sodium α-Al 2 o 3 . At present, the production process of activated alumina micropowder still faces two major technical problems: 1) the improvement of chemical purity, especially the further reduction of sodium content; 2) the improvement of alumina without affecting the chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/44
CPCC01F7/442C01P2004/62C01P2004/61C01P2006/12C01P2006/80
Inventor 张举张兰银
Owner 苏州盛曼特新材料有限公司
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