Method for preparing non-fired ceramsite from electroplating sludge

Abstract

The invention discloses a method for preparing non-fired ceramsite from electroplating sludge. The method comprises the following raw materials: 5 to 15% of Portland cement, 10 to 70% of fly ash, 5 to 40% of ground fine mineral waste residue, 10 to 20% of ground fine steel slag, 0 to 3% of quicklime, 0.3 to 1% of ferrous sulfate, 0 to 3% of gypsum powder, 2 to 10% of electroplating sludge (on a dry basis) and 0.1 to 0.3% of a density adjusting plasticizer. The method comprises the following steps: fully mixing the above raw materials except electroplating sludge in advance; then adding original electroplating sludge and water and carrying out rolling and uniform mixing under stirring; and then carrying out granulation and natural maintenance. The non-fired ceramsite prepared in the invention has bulk density, strength and water absorption rate meeting requirements prescribed in Lightweight Aggregate and Testing Methods thereof GB/T17431-2010, and the leaching concentrations of heavy metals like chromium are lower than limited values of V-class surface water prescribed in Environmental Quality Standards for Surface Water GB3838-2002; and the method can realize safe disposal and recycling of electroplating sludge.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method in which electroplating sludge is used to prepare non-fired ceramsite so as to obtain disposal and utilization. Background technique [0002] Electroplating sludge is a general term for surface treatment waste generated after electroplating and stainless steel pickling wastewater treatment. Because it contains heavy metal elements such as chromium, nickel, and copper, it is extremely harmful to human body and environment. Chromium, in particular, is one of the three internationally recognized carcinogenic metals. Water-soluble hexavalent chromium (hereinafter referred to as Cr(VI)) has the most serious toxicity, and the U.S. Centers for Disease Control and Prevention (ASDTR, CDC) listed Cr(VI) as the top 20 in 2007-2011. One of the priority monitoring substances. Electroplating sludge is one of the main hazardous wastes in our country, faci...

AI Technical Summary

Problems solved by technology

However, the research on preparing unfired ceramsite by using electroplating sludge is still in a blank state. The present invention uses electroplating sludge to prepare unfired ceramsite. At the same time as required by relevant standards, it is also necessary to ensure that heavy metals such as chromium are effectively solidified, and the leaching concentration meets the limit requirements of surface water standards. It is a method of resourceful utilization of electroplating sludge

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