Method for stabilizing and immobilizing cadmium in heavy metal pollution deposition by utilizing flue gas desulfurization gypsum

Abstract

The invention discloses a method for stabilizing and immobilization cadmium in heavy metal pollution deposition by utilizing flue gas desulfurization gypsum, belonging to the field of environmental-protection technology. 5-25wt percent of desulfurization gypsum is added in the cadmium polluted deposition as stabilization fixing agent, 400ml of water is added according to the proportion of 10ml ofwater in every gram of deposition, under a room temperature condition, the mixture is stirred in a magnetic stirrer at room temperature, so as to carry out cadmium stabilization and immobilization treatment in the heavy metal pollution deposition; the cadmium content in the deposition solution is used as the immobilization effect evaluation parameter of the cadmium in the deposition. In the invention, while solving the problem of the stabilization and immobilization of the cadmium in the deposition, the problem of recycling comprehensive utilization of flue gas desulfurization gypsum in coal-fired power plant is solved, so as to achieve the purposes of controlling waste by waste and recycling comprehensive utilization.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, specifically due to the diversity and uncertainty of heavy metal types in sediments, a method of using flue gas to carry out targeted stable immobilization of heavy metals in sediments by selecting sediments polluted by cadmium Stabilization of cadmium in heavy metal-contaminated sediments by desulfurization gypsum. technical background [0002] With the continuous development of society, the problem of water pollution has become increasingly prominent. The pollution rate of rivers, lakes and reservoirs in my country is as high as 80.1wt% (2005 data). Research data in 2001 showed that the cadmium in the main stream sediments of the Huangpu River exceeded the background value by 2 times, the lead exceeded the background value by 1 time, and the mercury content increased significantly; in Suzhou Creek, all the lead exceeded the standard, 75wt% of cadmium exceeded the standard, and ...

AI Technical Summary

Problems solved by technology

With the increasing installed capacity of thermal power plants in my country, it is estimated that during the "Twelfth Five-Year Plan" period, the annual desulfurization gypsum and other by-product gypsum will exceed 100 million tons. If not properly utilized, it will cause waste and secondary pollution

At present, some foreign developed countries such as the United States, Germany, and Japan have formed a complete desulfurization gypsum research, application, and development system, with a utilization rate of more than 90%. In the cement and gypsum board industry, it is also used in the fields of plastering plaster, gypsum powder, gypsum binder, agriculture, mortar for mine landfill, and roadbed materials, but it is greatly affected by the industrial scale

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