Experimental Study on Cleaning and Detoxification of Chromium in Construction Waste

By selecting varieties of factors, designing experiment in groups and other methods, the cleaning and detoxification of chromium in construction† waste has been studied. Experimental results show that: When particle diameter is larger than 1 cm, chromium and content are volatile in waste. On the opposite, the effect of particle size on the detoxification of waste is not significantly when it is smaller than 1 cm. In addition, the type and concentration of detergent have a great influence on cleaning and detoxifying. Detoxification effects on chromium of citric acid (0.1 mol/L, 0.5 mol/L) and concentration hydrochloric acid (0.5 mol/L, 1 mol/L) are very efficient, and removal rate is up to 90%. Citric acid, oxalic acid, concentrated hydrochloric acid, and concentrated acetic acid have the best effect on Cr6+ removal works. Removal rate is more than 99%.