Method for treating chromium-containing waste in cooperation with cement kiln

Abstract

The invention discloses a method for treating chromium-containing waste in cooperation with a cement kiln. The method comprises the steps of primary proportioning, tertiary proportioning, intermediatecontrol, calcining, curing and linkage monitoring, secondary adjustment, and reductive stabilization, wherein in the primary proportioning, the components of the chromium-containing waste is uniformthrough three control links of source control, classified piling and multiple homogenization, and reasonable adding; in the intermediate control process, a calcining clinker lattice in the cement kilncan cure heavy metal ions, and cure Cr ions in dangerous waste into the lattice; under the weaker calcining-oxidizing atmosphere of the cement kiln, the ratio of oxidization from Cr<3+> to Cr<6+> islowered, and the Cr6<6+> content is lowered; in the secondary adjustment, a composite reduction agent is added in the cement grinding process to reduce the Cr<6+> in the cement. The method for treating chromium-containing waste in cooperation with the cement kiln runs stably, is green and environmentally friendly, achieves the effects of solid waste reduction, energy conservation and emission reduction, lowers the influence of chromium-containing dangerous waste, and has good social benefit and economic benefit.

Description

technical field [0001] The invention relates to the relevant technical field of cement kiln co-processing, in particular to a method for co-processing chromium-containing waste in cement kilns. Background technique [0002] In industrial production, some industries such as electroplating, printing and dyeing, and leather metallurgy will produce more chromium-containing waste residues. The chromium in the waste residues is mainly trivalent chromium and hexavalent chromium, of which trivalent chromium has almost no harmful effects on the human body, while Hexavalent chromium is very harmful to the human body, and it is easy to lose and diffuse to form ecological pollution. It is very difficult to treat it. At present, the domestic hexavalent chromium treatment methods are mainly biological material adsorption, evaporation, precipitation, activated carbon adsorption, ion exchange resin, and electrodialysis. etc., and these methods are mainly used to repair heavy metal polluted ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for the co-processing of chromium-containing waste in cement kilns to solve the problems in the above-mentioned background technology that the processing efficiency of a large amount of chromium-containing waste is low, and the direct calcination of ordinary cement kiln co-processing is likely to affect the quality of cement products

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