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Flaky alumina and preparation method thereof

A technology of alumina and scales, which is applied in the field of scales of alumina and its preparation, can solve the problems of complex preparation process and achieve the effect of simplifying the preparation process

Inactive Publication Date: 2012-07-04
林仕冯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the scaly alumina is synthesized from a dry semi-finished product containing an alumina precursor after being treated with a high-temperature molten salt, and the dry semi-finished product containing an alumina precursor is first prepared in an aqueous solution through liquid phase The chemical reaction obtains a suspension liquid gel, and the obtained suspension liquid gel can be completely dehydrated after a long period of evaporation and drying, and becomes a dry semi-finished product containing alumina precursor, which makes the preparation process become complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh raw materials (g) according to the following weights:

[0034] Aluminum ammonium sulfate ((NH 4 )Al(SO 4 ) 2 12H 2 O) 266.8g, sodium sulfate (Na 2 SO 4 ) 125.4g, potassium sulfate (K 2 SO 4 ) 51.3g, titanium oxysulfate (TiOSO 4 2H 2 O) 1g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 0.3g.

[0035] Preparation method of flaky alumina:

[0036] Put 266.8g of aluminum ammonium sulfate, 125.4g of sodium sulfate, 51.3g of potassium sulfate, 124.7g of sodium carbonate, 1g of titanyl sulfate and 0.3g of ammonium dihydrogen phosphate in a mixer and stir them for 3 hours, then place them in alumina Incubate the crucible at 480°C for 1 hour, then treat it with molten salt at 1150°C for 5 hours, then cool the crucible to room temperature with the furnace, then dissolve in water at 60°C to remove soluble salts, filter out insoluble solids, and obtain flaky alumina primary powder.

[0037] Place the obtained flaky alumina primary powder in a sulfuric acid sol...

Embodiment 2

[0041] Weigh raw materials (g) according to the following weights:

[0042] Aluminum ammonium sulfate ((NH 4 )Al(SO 4 ) 2 12H 2 O) 266.8g, sodium sulfate (Na 2 SO 4 ) 250.8g, potassium sulfate (K 2 SO 4 ) 102.5g, titanium oxysulfate (TiOSO 4 2H 2 O) 1g, sodium phosphate (Na 3 PO 4 12H 2 O) 0.8g.

[0043] Put 266.8g of ammonium aluminum sulfate, 250.8g of sodium sulfate, 102.5g of potassium sulfate, 1g of titanyl sulfate, and 0.8g of sodium phosphate in a stirring ball mill. After mixing ball milling for 3 hours, place it in an alumina crucible and keep it warm at 550°C for 2 hours. Then molten salt treatment at 1200°C for 3 hours, then cool the crucible to room temperature with the furnace, dissolve in 50°C water to remove soluble salt, filter out insoluble solids, and obtain flaky alumina primary powder.

[0044] Place the obtained flaky aluminum oxide primary powder in a sulfuric acid solution with a concentration of 5wt%, heat it to 60°C, stir for 4 hours, filt...

Embodiment 3

[0048] Weigh raw materials (g) according to the following weights:

[0049] Aluminum ammonium sulfate ((NH 4 )Al(SO 4 ) 2 12H 2 O) 266.8g, sodium sulfate (Na 2 SO 4 )376.1g, potassium sulfate (K 2 SO 4 ) 153.8g, titanium oxysulfate (TiOSO 4 2H 2 O) 1.6g, sodium phosphate (Na 3 PO 4 12H 2 O) 0.8g.

[0050] Mix 266.8g of aluminum ammonium sulfate, 376.1g of sodium sulfate, 153.8g of potassium sulfate, 1.6g of titanyl sulfate and 0.8g of sodium phosphate in a stirring ball mill for 3 hours, and then place them in an alumina crucible at 450°C for 3 hours. Then, molten salt treatment was performed at 1400°C for 7 hours, and then the crucible was cooled to room temperature, then dissolved in water at 90°C to remove soluble salts, and insoluble solids were filtered out to obtain flaky alumina primary powder.

[0051] Place the obtained flaky alumina primary powder in a hydrochloric acid solution with a concentration of 1 wt%, heat it to 90°C, stir for 3 hours, filter, wa...

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Abstract

The invention discloses flaky alumina and a preparation method thereof. The method for preparing the flaky alumina comprises the following steps of: fully mixing aluminum-containing complex salt, soluble alkali metal sulfate, titanium salt, phosphoric acid or soluble phosphate by using a dry method; pre-sintering the mixture; melting the salts at high temperature to obtain a solid product; and performing water washing, acid washing, filtering and drying treatment on the solid product to obtain the flaky alumina. Compared with the conventional alumina, the flaky alumina has smaller thickness, larger particle size, high thickness ratio and smooth surface, and avoids forming twin crystal or clustered crystal.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic powder materials, and in particular relates to flaky alumina and a preparation method thereof. Background technique [0002] The main characteristics of flaky alumina are its small thickness and large particle size to thickness ratio. Due to its special two-dimensional planar structure, the flaky alumina has good adhesion, excellent shielding effect and ability to reflect light, and has good applications in the fields of pigments, coatings, plastics, automotive finishes and cosmetics. performance. [0003] Japanese Patent Application Laid-Open No. 3-131517, Japanese Patent Application No. 7-331110 and US Patent No. 0043910 proposed methods for preparing flake alumina by hydrothermal method and alcohol thermal method respectively. The flaky alumina prepared by these methods is not only fine in particle size, but also has a small particle size to thickness ratio, and is easy to form twin cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30
Inventor 张骞钟盛文林仕冯
Owner 林仕冯
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