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首页> 外文会议>XXI International Mineral Processing Congress >THE ROLE OF O_2, N_2 AND THEIR MIXTURE AT DIFFERENT PROPORTIONS OF N_2 ON THE FORMATION OF SODIUM CHROMATE
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THE ROLE OF O_2, N_2 AND THEIR MIXTURE AT DIFFERENT PROPORTIONS OF N_2 ON THE FORMATION OF SODIUM CHROMATE

机译：O_2，N_2及其在N_2不同比例下的混合物在铬酸钠形成中的作用

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The production of sodium chromate is an important chemical compound for some industries. Egypt imports this material from abroad, although Egypt is rich with chromite ores. This study is devoted to investigate the effect of the use O_2, N_2, and mixture of both, with varying proportions of N_2 on the formation of sodium chromate during the roasting of briquette made by soda ash with chromite ore concentrate (sodium chromate / chromic oxide = 2.5/1 mole ratio) from the El-Baramyia region. The results show that the use of oxygen in the roasting process at 1,100 °C yields more sodium chromate recovery produced than the use of other atmosphere. The results also show that the controlling mechanism for the production of 60% sodium chromate is limited by solid state diffusion. The main phases present in case of using nitrogen gas are FeO(Cr_2O_3)Al_2O_3, (Cr,Fe)_2O_3, Na_2SiO_4, NaAlSiO_4, NaAlSi_3O_8 and small amounts of NaCrO_2, Na_2CrO_4*H_2O and NaCrO_4*H_2O.
机译：铬酸钠的生产是某些行业的重要化合物。埃及从国外进口这种材料，尽管埃及富含铬铁矿。这项研究致力于研究使用苏打灰与铬铁矿精矿（铬酸钠/氧化铬）焙烧煤球过程中，使用O_2，N_2和二者的混合物以及不同比例的N_2混合使用对铬酸钠形成的影响。 ＝ 2.5 / 1摩尔比）。结果表明，与在其他气氛下相比，在1100°C的焙烧过程中使用氧气可产生更多的铬酸钠回收。结果还表明，固态扩散限制了60％铬酸钠生产的控制机制。在使用氮气的情况下存在的主要相为FeO（Cr_2O_3）Al_2O_3，（Cr，Fe）_2O_3，Na_2SiO_4，NaAlSiO_4，NaAlSi_3O_8和少量的NaCrO_2，Na_2CrO_4 * H_2O和NaCrO_4 * H_2O。

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