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Method for preparing high-purity tabular corundum with low energy consumption

A high-purity tabular alumina technology, which is applied in the field of preparing high-purity tabular alumina with low energy consumption, can solve the problems of increased production costs and high energy consumption for firing, and achieve the effects of shortening firing time, improving purity, and good high temperature resistance

Inactive Publication Date: 2012-08-01
萍乡市黄冠化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the purity of tabular alumina, the better its performance, but the higher the sintering temperature required, resulting in high energy consumption for sintering and increased production costs

Method used

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  • Method for preparing high-purity tabular corundum with low energy consumption
  • Method for preparing high-purity tabular corundum with low energy consumption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-temperature shaft kiln, its structure diagram is shown in the attached figure 1 , the specific structure is as follows:

[0028] The high-temperature shaft kiln consists of a drying chamber 1, a firing chamber 2, a cooling chamber 3 and a discharge port 4 from top to bottom; Inlet 6, waste gas outlet 7 is arranged above the side wall of the drying chamber; combustion-supporting hot air outlet 8 is arranged above the side wall of the cooling chamber, and combustion-supporting hot air inlet 9 and combustion-supporting hot air outlet 8 are arranged on the side wall of the firing chamber It communicates with the combustion-supporting hot-blast inlet 9 through a combustion-supporting hot-blast pipeline 10; a hot-blast outlet 11 is arranged below the side wall of the cooling chamber, and the hot-blast outlet 11 and the hot-blast inlet 7 below the sidewall of the drying chamber pass through a drying hot-blast pipeline 12 connected.

[0029] The high-temperature hot ai...

Embodiment 2

[0037] The method for preparing high-purity tabular alumina with the high-temperature shaft kiln of Example 1, the specific steps are:

[0038] (1) Mix 1000 kg of calcined industrial alumina powder with a purity of 98.5%, 5 kg of boric acid and 3 kg of aluminum fluoride in a QM-1 ball mill, use sintered plate-shaped corundum balls as grinding bodies, and dry grind to obtain an average Mixtures with a particle size of less than 5 microns.

[0039] (2) Add 5 kg of hydroxypropyl methylcellulose and 80 kg of water to the above mixture, and make green balls with a diameter of 20 mm to 30 mm in a drum type ball forming machine (model Φ2.5*3m).

[0040] (3) Send the green balls to the drying chamber at the top of the high-temperature shaft kiln, and dry the green balls with hot air drawn from the bottom of the cooling chamber of the high-temperature shaft kiln. The temperature of the hot air is 400°C to 650°C, and the drying time is 120 minutes;

[0041] (4) The dried green balls en...

Embodiment 3

[0044] The method for preparing high-purity tabular alumina with the high-temperature shaft kiln of Example 1, the specific steps are:

[0045] (1) Mix 1000 kg of calcined industrial alumina powder with a purity of 98.5%, 5 kg of boric acid and 5 kg of aluminum fluoride in a QM-1 ball mill, use sintered plate-shaped corundum balls as grinding bodies, and dry grind to obtain an average Mixtures with a particle size of less than 5 microns.

[0046] (2) Add 6 kg of hydroxypropyl methylcellulose and 100 kg of water to the above mixture, and make green balls with a diameter of 20 mm to 30 mm in a drum type ball forming machine (model Φ2.5*3m).

[0047] (3) Send the green balls to the drying chamber at the top of the high-temperature shaft kiln, and dry the green balls with hot air drawn from the bottom of the cooling chamber of the high-temperature shaft kiln. The temperature of the hot air is 400°C to 650°C, and the drying time is 100 minutes;

[0048] (4) The dried green balls e...

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Abstract

The invention provides a method for preparing high-purity tabular corundum with low energy consumption. The method comprises the following steps of: adding an additive to industrial alumina powder serving as raw material, wherein the additive is composed of boric acid and aluminum fluoride according to a mass ratio being 0.5-1.5:1 and is used for removing impurities out of alumina powder; mixing and grinding, adding hydroxypropyl methyl cellulose and water and preparing into blank balls; loading the blank balls into a drying chamber at the top of a high-temperature shaft kiln so that the blank balls are dried with hot air pumped out from the bottom of the high-temperature shaft kiln; conveying the dried blank balls into a firing chamber of the high-temperature shaft kiln, keeping the temperature at 1930-1970 DEG C for 40-60 minutes, then cooling to 90-120 DEG C in a cooling chamber and discharging from the shaft kiln; crushing, screening, removing iron and packaging to finally obtain tabular corundum in which mass content of alumina is 99.4-99.6%. The high-purity tabular corundum is fired at a high temperature quickly, the impurity removing effect of the additive is strengthened, the purity of the product is improved, the crystallization of the tabular corundum is promoted, the firing energy consumption is reduced to the greatest extent, and the preparation cost of the tabularcorundum is reduced further.

Description

technical field [0001] The invention relates to material preparation technology, and further refers to a method for preparing high-purity plate corundum with low energy consumption. Background technique [0002] Tabular alumina is a kind of sintered corundum with flaky crystals. Its purity is generally above 98%. It has the characteristics of high temperature strength and good thermal shock resistance. It has been widely used in metallurgy, chemical industry, ceramics and other industries. application. At present, the method of producing tabular alumina at home and abroad is mainly to use alumina powder with a purity of more than 98% as raw material, which is fired at 1800°C to 1920°C in a high-temperature furnace after pressing or extrusion. In order to lower the sintering temperature, a small amount of sintering aid is usually added, and a longer holding time is used to obtain more complete crystallized tabular alumina. Such as patent 02113098.1 with γ-Al 2 o 3 Main ra...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 黄波肖汉宁
Owner 萍乡市黄冠化工有限公司
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