Formed mercury-removing material modified by transition metal selenide and preparation method thereof

Abstract

The invention discloses a transition metal selenide modified molded demercuration material and a preparation method thereof. The transition metal selenide modified molded demercuration material comprises a molded carrier and an active component loaded on the molded carrier, wherein the active component is a transition metal selenide, and the transition metal selenide is selected from one or more of copper selenide, nickel selenide, zinc selenide or iron selenide. The preparation method comprises the following steps: firmly and uniformly loading a certain amount of a transition metal on the molded carrier by adopting a wet chemical reduction method, and converting the transition metal into the transition metal selenide by adopting an in-situ selenylation method, thereby obtaining the transition metal selenide modified molded demercuration material. The preparation method is simple, the obtained transition metal selenide modified molded demercuration material is large in adsorption capacity, good in mechanical property, fluid property and plasticity, and is suitable for different demercuration application occasions, and the secondary release risk of mercury is reduced.

Description

technical field [0001] The invention belongs to the technical field of mercury pollution prevention and control in flue gas, and in particular relates to a molding process modified by transition metal selenide [0002] Mercury removal material and preparation method thereof. Background technique [0003] Mercury has strong volatility, persistence, long-distance transport and bioaccumulation, and is regarded as a global highly toxic pollutant. According to the latest "Global Mercury Assessment Report" released by the United Nations Environment Program, the global anthropogenic mercury emissions reached 2,150 tons in 2015, an increase of 12% over 2010, among which coal combustion and smelting industries are the largest sources of anthropogenic mercury emissions. On August 16, 2017, the globally legally binding Minamata Convention on Mercury came into effect. The Convention stipulates that measures must be taken for coal-fired boilers and smelting flue gas to control and reduc...

AI Technical Summary

Problems solved by technology

[0004] Activated carbon injection (ACI) is currently a relatively mature flue gas mercury removal technology, but it still has some defects: (1) Due to the limited mercury adsorption capacity of activated carbon, in order to obtain a high mercury removal effect, a large amount of activated carbon needs to be injected, so that Lead to very high operating costs; (2) SO in the flue gas 2 and H 2 O will inhibit the adsorption of mercury by activated carbon; (3) the activated carbon after adsorbing mercury will be captured by the dust removal device together with the fly ash, and the mercury may be leached and released into the environment again, resulting in secondary pollution; (4) the introduction of ACI Carbon will affect the use value of fly ash as a raw material for concrete production; (5) The contact time between the adsorbent and the flue gas is short (usually less than 5 seconds), which greatly limits the adsorption of mercury. lead to waste of a large amount of adsorbent

Although this type of method has a high mercury removal rate, the operating cost is high, and there are problems with the safe disposal of waste absorption liquid