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Process for the Recovery of Chromium content and similar industrial waste materials such as waste of Tannery Chrome Loaded,Including the control of contamination
Process for the Recovery of Chromium content and similar industrial waste materials such as waste of Tannery Chrome Loaded,Including the control of contamination
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机译:回收铬含量和类似工业废料的方法,例如装载制革铬的废料,包括污染的控制
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摘要
The invention provides a process for reclaiming chromium from roasted chromium ash containing chromium in substantially completely the hexavalent state, comprising: mixing the ash with sulfuric acid and water to form an acid-ash slurry; adding a reducing agent to the slurry to convert the hexavalent chromium to the trivalent state; filtering out an extract solution; water-washing the residue; and applying the water-wash to use as one of waste treatment processing, a component of a pickling agent, and a re-cycled solution; the extract solution providing reclaimed chromium. This procedure not only produces an appropriate chrome tanning liquor with specific tanning properties, but also results in an inert residue which is safely disposable, non-polluting, and even useful as a filler material in the leather manufacturing process or as a form of clay.
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