Adsorbent for adsorbing mercury in smoke and preparation method of adsorbent

Abstract

The invention discloses an adsorbent for adsorbing mercury in smoke and a preparation method of the adsorbent. The adsorbent comprises the following components in parts by weight: 20-30 parts of semicoke powder, 5-10 parts of ferric trichloride, 10-25 parts of copper oxide, 40-60 parts of aluminium oxide and 1-5 parts of titanium dioxide. The preparation method comprises the following steps: (a) grinding the semicoke powder into particles of 100-200 meshes, preparing ferric trichloride into a water solution, soaking the semicoke powder into the ferric trichloride water solution for 10-15h; (b) pulping pseudo-boehmite, titanium dioxide precursor and copper oxide precursor according to the weight parts for mixing; (c) sufficiently mixing the semicoke particles obtained by the step (a) with the pulp obtained by the step (b), and drying the obtained mixture; and (d) roasting the dried particles at temperature 300-500 DEG C, and cooling to obtain the adsorbent, wherein the adding amount of pseudo-boehmite is calculated on the basis of that of aluminium oxide, and the adding amount of the titanium dioxide precursor and the copper oxide precursor is calculated on the basis of that of titanium dioxide and copper oxide respectively. The mercury adsorbing rate of the adsorbent can reach 95%, and good regenerability is obtained.

Description

technical field [0001] The invention belongs to the field of gas pollutant treatment, in particular to the adsorption treatment of heavy metals such as mercury in coal combustion flue gas. The invention relates to an adsorbent for adsorbing heavy metals such as mercury in coal combustion flue gas and a preparation method thereof. Background technique [0002] Coal is the most important energy source for the entire industry, and the pollutants produced by coal combustion, except SO and NO x and CO 2 In addition, there are various forms of mercury, and a large amount of mercury released into the atmosphere will cause direct or potential harm to human health. The average mass fraction of mercury in Chinese coal is 0.22 mg / kg. Due to the massive combustion of coal, the total amount of mercury released from coal combustion is more than 1590t every year, accounting for about 50% of the world's total. During the combustion of coal, the high temperature gasifies the mercury in t...

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Problems solved by technology

[0006] Mercury removal using existing pollutant control devices is mainly to properly improve common dust removal devices, wet desulfurization devices, and SCR denitrification devices. The investment is small and the implementation is simple and easy, but it can only remove Hg 0 , unable to remove Hg 2+ , the overall mercury removal efficiency is low; coal additive mercury removal can effectively oxidize Hg 0 , high efficiency, low operating cost, but there is a problem that the post-treatment of additives is more complicated; the mercury removal efficiency of the adsorbent is high, and the equipment modification and operation are simple, but the operating cost is high, which affects the post-treatment utilization of fly ash; Oxidative demercuration is the oxidation of Hg by oxidizing agent 0 , its mercury removal efficiency is high, and the operation of the equipment is simple, but there is a problem of corrosion of the equipment by the oxidant

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