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首页> 外文期刊>ISIJ international >Effective Chromium Extraction from Chromium-containing Vanadium Slag by Sodium Roasting and Water Leaching
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Effective Chromium Extraction from Chromium-containing Vanadium Slag by Sodium Roasting and Water Leaching

机译：通过钠焙烧和水浸从含铬钒渣中有效提取铬

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摘要

Chromium (Cr) was concentrated as chromium spinel in the vanadium slag produced by pre-oxidizing vanadium-containing hot metal in Pan-steel in China. Due to the chromium-rich Hongge ores used, chromium concentration in this slag was much higher than that in common vanadium slags. To propose a process for effective Cr extraction from the slag, mechanisms of Cr oxidation in Pan-steel vanadium slag under sodium roasting conditions were studied experimentally and with thermodynamic simulations. Chromium slags without vanadium were synthesized in the laboratory to mimick mineralogical characteristics of Pan-steel vanadium slag and characterized by XRD, SEM/EDS and TG-DSC techniques. Conditions for Cr extraction from the chromium slag after sodium roasting by leaching with water were studied and optimized. Results showed that Cr spinel was encapsulated in the silicate phase. During sodium roasting, Cr spinel was oxidized and decomposed after oxidation and decomposition of the olivine phase. Sodium carbonate began to react with chromium oxide, which was produced by decomposition of Cr spinel, at 537℃ and large amount of sodium chromate appeared after 800℃. However, multi-component liquid phase (mixture of Na_2Cr_2O_4, Na_2CrO_4 and Na_2CO_3) was produced after 1 000℃, which suppressed the conversion of Cr(lll) to Cr(VI) by inhibiting oxygen supply. A conversion about 90% was obtained when the chromium slag was roasted at 1 000℃ for 2 h with Na_2CO_3 addition in stoichiometric ratio to total amount of Cr_2O_3 and SiO_2. 96% of Cr in the leaching liquid was recovered as chromium sesquioxide in fine powder form and high purity by reducing and precipitating.
机译：在中国的攀钢中，通过对含钒铁水进行预氧化而生成的钒渣中，铬（Cr）浓缩为铬尖晶石。由于使用了富含铬的鸿格矿石，因此该矿渣中的铬浓度比普通钒矿渣中的铬浓度高得多。为了提出一种有效地从炉渣中提取铬的方法，实验研究了钠焙烧条件下泛钢钒渣中铬的氧化机理并进行了热力学模拟。在实验室中合成了不含钒的铬渣，以模仿潘钢钒渣的矿物学特征，并通过XRD，SEM / EDS和TG-DSC技术对其进行了表征。研究和优化了钠浸出水焙烧后从铬渣中提取铬的条件。结果表明Cr尖晶石被包封在硅酸盐相中。在钠焙烧期间，铬尖晶石在橄榄石相氧化和分解后被氧化分解。碳酸钠在537℃下开始与铬尖晶石分解产生的氧化铬反应，在800℃后出现大量铬酸钠。然而，在1000℃后产生了多组分液相（Na_2Cr_2O_4，Na_2CrO_4和Na_2CO_3的混合物），通过抑制氧气的供应抑制了Cr（III）向Cr（VI）的转化。铬渣在1000℃下焙烧2 h，加入化学计量比为Cr_2O_3和SiO_2的化学计量比的Na_2CO_3时，转化率为90％。浸出液中96％的铬通过还原和沉淀以细粉状和高纯度的形式回收为倍半氧化铬。

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  • 来源
    《ISIJ international》 |2012年第11期|p.1958-1965|共8页
  • 作者

    Hai-Xing FANG; Hong-Yi LI; Bing XIE;

  • 作者单位

    College of Materials Science and Engineering, Chongqing University, Chongqing, 400044 China;

    College of Materials Science and Engineering, Chongqing University, Chongqing, 400044 China;

    College of Materials Science and Engineering, Chongqing University, Chongqing, 400044 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chromium extraction; chromium spinel; sodium roasting; oxidation mechanism;

    机译：铬提取铬尖晶石钠焙烧氧化机制;

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