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首页> 外文期刊>Environmental research >Effective recycling of Co and Sr from Co/Sr-bearing wastewater via an integrated Fe coagulation and hematite precipitation approach
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Effective recycling of Co and Sr from Co/Sr-bearing wastewater via an integrated Fe coagulation and hematite precipitation approach

机译：通过集成的Fe凝固和赤铁矿降水方法有效地再循环CO和Sr从CO / SR轴承废水中

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摘要

Flocculant overdose has been considered an inefficient technique for precipitating heavy metals from wastewater at low levels due to the high yield of hazardous waste sludge that should be treated properly before it can be disposed of safely in landfills. This problem was effectively solved in this study via a novel method that recycles sludge separately into high-purity hematite and heavy metal-bearing products. The wastewater, which contained 10.3 mg/L of Co and 4.8 mg/L of Sr, was coagulated by adding ferric salt to generate Co/Sr-bearing sludge. The sludge was dissolved in HNO_3, followed by hydrothermal treatment with the addition of organic matter (e.g. methanol or isopropanol). Without the addition of organic matter, only 56.5% of total Fe was removed as irregular hematite particles, whilst Co/Sr remained unchanged in the acid. Over 99.5% of total Fe was eliminated as hematite nanoparticles with 97.7% Fe_2O_3 content, but more than 98% Co/Sr remained in the acid when methanol with a molar ratio (M_(methanol)/M_(Fe)) of 5 was added. Nearly 100% Co was precipitated by adjusting the pH of the acid to 8 to generate Co hydroxide with 83.9% purity. Meanwhile, the residual Sr was further precipitated by adding Na_2CO_3 to generate SrCO_3 with 96.8% purity. Isopropanol achieved total Fe removal similar to that of methanol. The optimal molar ratio (M_(Isoproppanol)]/M_(Fe)) was 1, which corresponded to the removal of 98.7% total Fe. Methanol and isopropanol can react with NO_3~- in acid to reduce NO_2 concentration and improve acid pH, promoting hydrolysis followed by the crystallisation of ferric Fe with hematite as the final product. This paper is the first report on an environment-friendly method for enriching Co/Sr without generating any waste.
机译：由于危险废物污泥的高产率在垃圾填埋场中安全地处理，因此絮凝剂过量被认为是一种低水平的低水平，在低水平下沉淀来自废水的低水平。本研究通过一种新的方法在本研究中有效地解决了该问题，该方法将污泥分别回收到高纯度赤铁矿和重金属含量的产品中。含有10.3mg / L CO和4.8mg / L的Sr的废水是通过添加铁盐来产生Co / Sr轴承污泥的凝固。将污泥溶解在HNO_3中，然后通过添加有机物（例如甲醇或异丙醇）水热处理。在没有添加有机物的情况下，除了不规则的赤铁矿颗粒中仅除去56.5％的总铁，在酸中仍保持不变。以超过99.5％的总铁被除以含有97.7％Fe_2O_3含量的赤铁矿纳米颗粒，但是当加入5的摩尔比的甲醇（M_（甲醇）/ m_（Fe））时，仍然超过98％的CO / Sr 。通过将酸的pH调节至8以产生氢氧化物，纯度为83.9％，通过催化近100％的CO。同时，通过加入Na_2CO_3进一步沉淀残留Sr以产生96.8％纯度的SrCO_3。异丙醇达到总铁的除去与甲醇相似。最佳摩尔比（M_（异丙醇）] / m_（Fe））为1，其对应于去除98.7％的Fe。甲醇和异丙醇可以与NO_3〜 - 酸反应，以减少NO_2浓度，并改善酸pH，促进水解，然后用赤铁矿作为最终产物的氟氯磺酸酯的结晶。本文是关于富集CO / SR的环境友好型方法的第一份报告，而不会产生任何浪费。

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  • 来源
    《Environmental research》 |2020年第8期|109654.1-109654.9|共9页
  • 作者

    Ting Su; Zhijie Han; Zhan Qu; Yu Chen; Xue Lin; Suiyi Zhu; Rui Bian; Xinfeng Xie;

  • 作者单位

    School of Environment Northeast Normal University Changchun 130117 China;

    School of Environment Northeast Normal University Changchun 130117 China;

    School of Environment Northeast Normal University Changchun 130117 China;

    Jilin Institute of Forestry Survey and Design Changchun 130022 China;

    School of Environment Northeast Normal University Changchun 130117 China;

    School of Environment Northeast Normal University Changchun 130117 China;

    School of Environment Northeast Normal University Changchun 130117 China;

    Michigan Technological University School of Forest Resources and Environmental Science Houghton Ml 49932 USA;

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  • 正文语种 eng
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  • 关键词

    Wastewater treatment; Recycling; Hematite; Coagulation; Hydrothermal method;

    机译：废水处理;回收;赤铁矿;凝血;水热法;

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