Industrially-synthesized magnesium-iron-aluminum compound spinel and synthetic method thereof

Inactive Publication Date: 2011-09-14
ZIBO GT INDAL CERAMICS
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Problems solved by technology

However, this firing atmosphere condition cannot actually be realized in an industrial combustion kiln, because the gas in the kiln removes CO, CO 2 , O 2 There are also a large numbe

Method used

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  • Industrially-synthesized magnesium-iron-aluminum compound spinel and synthetic method thereof

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Embodiment

[0026] The ingredients are iron compounds, industrial alumina, magnesium-containing compounds, carbon-containing compounds, zirconium-containing oxides and binders. All raw materials are passed through a 80-mesh sieve, and the ingredients meet the chemical composition requirements of the product: Fe 2 o 3 25-45%, Al 2 o 3 35~55%, MgO0~30%, ZrO 2 0~5%. The binding agent is one of pulp waste liquid, starch, dextrin, resin, polyvinyl alcohol and methyl cellulose, which were tested respectively, and the addition amount is 1 to 6% of the total weight of the ingredients, and 3%, 4 %, 4.5% and 6% were tested.

[0027] The ingredients can be ground and pulverized, either dry or wet, and can be pressed on a 400-1200-ton press to make a billet, or mixed with an appropriate amount of water, then vacuumed and squeezed to make a billet, and dried at 110°C.

[0028] For industrial kilns, the temperature rises naturally before 600°C; the heating process of 600-1200°C turns into a red...

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Abstract

The invention relates to an industrially-synthesized magnesium-iron-aluminum compound spinel and a synthetic method thereof, belonging to the technical field of refractory materials. The compound spinel comprises the following chemical components in percentage by weight: 25-45 percent of Fe2O3, 35-55 percent of Al2O3, 0-30 percent of MgO and 0-5 percent of ZrO2. The synthetic method comprises the following steps of: preparing materials, blanking and sintering, wherein an industrial kiln is taken as a sintering kiln, and the temperature is raised freely below 600 DEG C; and transferring into a reducing atmosphere in the process of raising the temperature from 600 DEG C to 1,200 DEG C, preserving heat at the sintering temperature between 600 DEG C and 1,200 DEG C for 3-8 hours when the CO concentration is over 10,000 PPm, preserving the reducing atmosphere, lowering the temperature to 800-600 DEG C and naturally cooling to room temperature. The synthetic method is simple in synthetic process, convenient for industrial control and easy for mass production.

Description

technical field [0001] The invention relates to an industrially synthesized magnesium-iron-aluminum composite spinel and a synthesis method, belonging to the technical field of refractory materials. Background technique [0002] The researchers of RHI Magnesium Corporation (RHI) used the electric melting method to industrially manufacture and synthesize high-purity iron-aluminum spinel, which has high production efficiency. [0003] Using nitrogen protection to synthesize ferrous aluminum spinel can only be fired in an electric furnace, which is small in scale and low in efficiency. [0004] It has been reported that under laboratory conditions, in an electric furnace at 1550°C and CO / (CO+CO 2 +O 2 ) is 10% of the reducing atmosphere condition, can obtain the iron-aluminum spinel with higher synthesis rate. However, this firing atmosphere condition cannot actually be realized in an industrial combustion kiln, because the gas in the kiln removes CO, CO 2 , O 2 There are ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/443
Inventor 李玉强张瑛冯延春李志军刘杰逄丽丽
Owner ZIBO GT INDAL CERAMICS
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