Method for treating electroplating and precious metal smelting wastewater

Abstract

The invention belongs to a method for treating electroplating and precious metal smelting wastewater. The method comprises the following steps: chelating, precipitating and separating the wastewater to obtain complex metal-containing sludge with the moisture content of 85% and part of wastewater; dehydrating and drying the sludge until the water content is 30-50%, and pouring the sludge into a sludge storage pool; heating the sludge with the metal content exceeding 5% in the sludge storage pool; incinerating sludge with the metal content lower than 5%, detecting whether fly ash generated in the incineration process contains heavy metals and whether the heavy metals exceed the standard, and if so, chelating the fly ash; and if not, performing subsequent resource utilization. According to the invention, harmlessness and reduction in the wastewater treatment process in the electroplating industry and the precious metal smelting industry can be well realized, the sludge output can be directly reduced by more than 30% by a chelating process, and secondary pollution and the like generated in the sludge treatment process can be reduced as much as possible by recycling. According to the technical scheme, the technological process, system equipment and the like are stable and reliable in performance, suitable for centralized disposal, large in disposal capacity and low in cost.

Description

technical field [0001] The invention relates to the field of treatment of sludge generated during the treatment of electroplating wastewater and precious metal smelting wastewater, in particular to a treatment method for heavy metal-containing and precious metal smelting wastewater. Background technique [0002] According to relevant data, due to the rapid expansion of the electroplating industry / precious metal smelting industry, many harmful substances have been contained in the water body, and water resources have been polluted in a large area. The electroplating industry / precious metal smelting industry has been selected as a global serious pollution one of the industries. The pollutants in electroplating wastewater / precious metal smelting wastewater are relatively complex, and the water quality components are not easy to control, but in general, it can be divided into heavy metal ion wastewater, acid-base wastewater, and oily wastewater, etc. kind of pollutants. The to...

AI Technical Summary

Problems solved by technology

In recent years, under the government's environmental protection policy, the domestic electroplating industry / precious metal smelting industry has carried out upgrading and upgrading of wastewater treatment standards, and the discharge of wastewater has achieved remarkable results. However, a large amount of "Hazardous waste sludge containing heavy metals and precious metals"

[0003] At present, in the treatment of electroplating wastewater / precious metal smelting wastewater in China, the treatment cost is high, the energy consumption is high, the treatment is not thorough, and there are even secondary pollution problems, and the treatment capacity is relatively low, so centralized treatment cannot be achieved