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Recovery of value-added products from red mud and foundry bag-house dust.

机译：从赤泥和铸造袋尘中回收增值产品。

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摘要

"Waste is wasted if you waste it, otherwise it is a resource. Resource is wasted if you ignore it and do not conserve it with holistic best practices and reduce societal costs. Resource is for the transformation of people and society.".;Red mud is a worldwide problem with reserves in the hundreds of millions of tons and tens of millions of tons being added annually. Currently there is not an effective way to deal with this byproduct of the Bayer Process, the primary means of refining bauxite ore in order to provide alumina. This alumina is then treated by electrolysis using the Hall-Heroult process to produce elemental aluminum. The resulting mud is a mixture of solid and metallic oxides, and has proven to be a great disposal problem. This disposal problem is compounded by the fact that the typical bauxite processing plant produces up to three times as much red mud as alumina. Current practice of disposal is to store red mud in retention ponds until an economical fix can be discovered. The danger associated with this current method of storage is immense to the surrounding communities and environment, thus the interest from the Center for Resource Recovery and Recycling (CR3). The purpose of this document is to explain one way to remove the value added materials, primarily iron, from the Jamaican red mud using both pyrometallurgical and hydrometallurgical approaches.;In the beginning, soda ash and carbon roasting were completed simultaneously at 800°C. This type of roasting produced results that were unacceptable. After the soda ash roast was completed independently of carbon roasting, a water wash produced results that separations of alumina at 90%, Iron at 99%, calcium at 99%, titanium t 100%, and sodium by 74%. Smelting produced separations of 97% for alumina, 99% for iron, 87% for sodium, 94% for calcium and 72% for titanium.
机译：“浪费浪费就是浪费，否则浪费了资源。如果忽略它，浪费资源，并且不采用整体最佳实践来节省浪费，降低了社会成本。浪费资源是为了人类和社会的变革。”泥浆是一个世界性的问题，每年有数亿吨的储量，每年增加数千万吨。当前，没有有效的方法来处理拜耳法的副产物，拜耳法是提纯铝土矿以提供氧化铝的主要手段。然后使用霍尔-赫鲁特（Hall-Heroult）工艺通过电解处理氧化铝，以生产元素铝。产生的泥浆是固体氧化物和金属氧化物的混合物，并且已证明是一个很大的处理问题。典型的铝土矿加工厂产生的红泥量是氧化铝的三倍，这使处理问题变得更加复杂。当前的处置方法是将红泥存储在保留池中，直到发现经济的解决方法为止。与当前的这种存储方法相关的危险对周围的社区和环境具有极大的危害，因此资源回收和再循环中心（CR3）对此很感兴趣。本文档的目的是说明一种使用火法和湿法冶金方法从牙买加赤泥中去除增值材料（主要是铁）的方法。最初，纯碱和碳焙烧在800°C下同时完成。这种烘烤产生的结果是不可接受的。在完成纯碱焙烧而与碳焙烧无关的情况下，水洗产生的结果是，氧化铝的含量为90％，铁的含量为99％，钙的含量为99％，钛的含量为100％，钠的含量为74％。熔炼产生的氧化铝分离度为97％，铁为99％，钠为87％，钙为94％，钛为72％。

著录项

  • 作者

    Hammond, Keegan.;

  • 作者单位

    Colorado School of Mines.;

  • 授予单位 Colorado School of Mines.;
  • 学科 Engineering Materials Science.
  • 学位 M.S.
  • 年度 2014
  • 页码 107 p.
  • 总页数 107
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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