High-temperature reduction of chromium (VI) in solid alkali

Chromium (VI) that exists in many industrial wastes is considered highly toxic. One of the most common ways to dispose of these wastes is to reduce chromium (VI) to chromium (III), which is less toxic and can be relatively easily removed or fixed. However, the reduction of chromium (VI) is often con...

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Bibliographic Details
Published in:Journal of hazardous materials 2004-08, Vol.112 (1), p.63-69
Main Authors: Wang, Tiangui, Li, Zuohu
Format: Article
Language:English
Subjects:
Alkalies - chemistry
Alkaline solid
Applied sciences
Calcination
Chromium - chemistry
Exact sciences and technology
Hexavalent chromium
Hot Temperature
Industrial Waste - prevention & control
Other industrial wastes. Sewage sludge
Oxidation-Reduction
Pollution
Reduction
Removal
Sodium Bicarbonate - chemistry
Starch - chemistry
Sucrose - chemistry
Temperature
Wastes
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Summary:Chromium (VI) that exists in many industrial wastes is considered highly toxic. One of the most common ways to dispose of these wastes is to reduce chromium (VI) to chromium (III), which is less toxic and can be relatively easily removed or fixed. However, the reduction of chromium (VI) is often conducted in acidic solutions and the chromium (VI) in alkaline solid wastes is hardly to be fully removed. The present study describes a new method for reducing chromium (VI) in alkaline solid. By mixing alkaline solids containing chromium (VI) with an aqueous sucrose solution and then calcinating the resulting mixture at 400–600 °C in inertial gas, chromium (VI) can be easily reduced to an insoluble chromium oxide. The reduced fraction can reach up to 99% in 10–20 min under the conditions of temperature above 600 °C and sucrose/chromium ( VI)≥1 g/1 g .
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2004.03.022