Preparation method and applications of gaseous mercury adsorbent

Abstract

The invention discloses a preparation method of a gaseous mercury adsorbent. The preparation method comprises following steps: (1) mixing active carbon and concentrated sulfuric acid, aging, filtering, and washing to obtain modified active carbon; (2) mixing thiourea and metal salts to obtain a metal thiourea mixed solution, wherein the metal ions of the metal thiourea mixed solution are copper ions and / or iron ions; and (3) mixing modified active carbon and the metal thiourea mixed solution to impregnate modified active carbon, and after impregnation, drying obtained materials in vacuum to obtain the gaseous mercury adsorbent. The invention also discloses an application of the gaseous mercury adsorbent on absorbing gaseous mercury in high sulfur smelting exhaust gas. The prepared gaseous mercury adsorbent can absorb gaseous mercury and divalent mercury in flue gas, has an excellent sulfur-resistant performance, and has high mercury removing efficiency, even if the concentration of sulfur dioxide is high.

Description

technical field [0001] The invention belongs to the field of adsorbents, in particular to an adsorbent suitable for gaseous mercury in the high-sulfur flue gas of non-ferrous smelting. Background technique [0002] Mercury is a heavy metal that is harmful to human health and the ecological environment. How to control the emission of mercury in the atmosphere has become one of the hot spots of global concern. my country is a country with large atmospheric mercury emissions, and the non-ferrous smelting industry is one of the main sources of atmospheric mercury pollution emissions in my country. Therefore, reducing atmospheric mercury emissions from the non-ferrous metal smelting industry has become the focus of mercury pollution control in my country. [0003] During high-temperature combustion, most elements such as mercury and sulfur in fuel or ore volatilize into the flue gas, forming high-sulfur mercury-containing smelting flue gas. At present, for the removal of mercury...

AI Technical Summary

Problems solved by technology

At present, for the removal of mercury in smelting flue gas, the synergistic removal process is mainly adopted, that is, the synergistic removal is carried out in the flue gas waste heat recovery, dust removal, wet purification, flue gas acid production, flue gas desulfurization and other treatment processes. In the mercury process, mercury will be dispersed in flue gas, smoke dust, polluted acid and other media, which increases the difficulty of mercury emission nodes and subsequent control. Therefore, efficient and concentrated capture of gaseous mercury has become the main research direction for mercury pollution control

[0004] Chinese patent ZL201510811049.X discloses a preparation method and application of a mercury removal composite catalyst, which uses aluminum oxide as a carrier, palladium and copper chloride as catalytic active components, and efficiently oxidizes elemental mercury in flue gas, but the The method uses noble metals as active components, the cost of materials is high, and the oxidized mercury after catalysis still needs to be treated

Chinese patent ZL201610944690.5 discloses a preparation method of a composite highly active mercury removal adsorbent, which uses copper chloride to modify fly ash and loads copper oxide on attapulgite to achieve efficient adsorption of elemental mercury, but It is susceptible to high concentrations of sulfur dioxide

Images