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首页> 外文会议>Symposium on magnesium technology;TMS annual meeting exhibition >MAGNESIUM PRODUCTION BY VACUUM ALUMINOTHERMIC REDUCTION OF A MIXTURE OF CALCINED DOLOMITE AND CALCINED MAGNESITE
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MAGNESIUM PRODUCTION BY VACUUM ALUMINOTHERMIC REDUCTION OF A MIXTURE OF CALCINED DOLOMITE AND CALCINED MAGNESITE

机译：通过真空铝热还原煅烧白云石和煅烧镁石的混合物生产镁

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摘要

A new method of magnesium production was proposed that using a mixture of calcined dolomite and calcined magnesite as raw materials with the molar ratio of MgO to CaO was 6:1 by vacuum aluminothermic reduction. The reduction process was studied by thermodynamic analysis and X-ray diffraction analysis of reduction residue. The reaction of reduction process was CaO+6MgO+4Al=CaO·2Al_2O_3+6Mg. The effect of briquetting pressure, reduction temperature, time and CaF_2 (MgF_2) on reduction ratio of MgO was investigated. And the reduction residue that the main phase of CaO·2Al_2O_3 was leached in alkaline solution for producing sodium aluminate-the raw material for special alumina. The results show that the reduction ratio is increased with increasing of the temperature, time, briquetting pressure in range from 40 to 100 MPa and addition of CaF_2 or MgF_2 in range from 0 to 3%. The alumina leaching ratio of reduction residue reached 88% at the conditions of leaching temperature 95 ℃ and the concentration ratio of Na_2CO_3 to NaOH was 100:75 in leaching solution.
机译：提出了一种新的镁生产方法，该方法采用煅烧的白云石和煅烧的菱镁矿的混合物作为原料，通过真空铝热还原，MgO与CaO的摩尔比为6：1。通过热力学分析和X射线衍射分析对还原残留物进行了研究。还原过程的反应为CaO + 6MgO + 4Al = CaO·2Al_2O_3 + 6Mg。研究了压块压力，还原温度，时间和CaF_2（MgF_2）对MgO还原率的影响。并在碱性溶液中浸出CaO·2Al_2O_3主相以还原铝酸钠的还原残留物。铝酸钠是特种氧化铝的原料。结果表明，随着温度，时间，压块压力的增加，压降率在40〜100 MPa范围内增加，CaF_2或​​MgF_2的添加量在0〜3％范围内。在浸出温度95℃的条件下，还原渣的氧化铝浸出率达到88％，浸出液中Na_2CO_3与NaOH的浓度比为100：75。

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