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

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 ...

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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 number of N 2 and H 2 O gas, CO / (CO+CO 2 +O 2 ) is 10% of the reducing atmosphere firing conditions are difficult to achieve, and there is great difficulty in industrial scale production

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