Preparation method and applications of gaseous mercury adsorbent

A gaseous mercury and adsorbent technology, applied in the field of gaseous mercury adsorbents, can solve problems such as impact, high material cost, increase mercury emission nodes and subsequent control difficulties, and achieve high mercury removal efficiency, high mercury removal efficiency, The effect of excellent sulfur resistance

Active Publication Date: 2019-09-20
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 m

Method used

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  • Preparation method and applications of gaseous mercury adsorbent
  • Preparation method and applications of gaseous mercury adsorbent
  • Preparation method and applications of gaseous mercury adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation method of gaseous mercury sorbent of the present invention comprises the following steps:

[0039] (1) Take 0.05 mol of copper nitrate and add it to 30 mL of deionized water, stir until it is completely dissolved; then take 0.2 mol of thiourea, add it to the prepared copper nitrate solution, and ultrasonicate for 15 minutes to ensure the formation of uniform copper-sulfur Urea complex solution;

[0040] (2) Take 15mL of sulfuric acid matured activated carbon (prepared by the method of Comparative Example 1), add it to the prepared 30mL copper thiourea complex solution, stir and impregnate for 20min, the stirring speed is 500r / min, and the impregnation temperature is 25°C , impregnated, filtered, and dried to obtain a gaseous mercury adsorbent (activated carbon after sulfuric acid aging + copper thiourea complex impregnation).

Embodiment 2

[0042] A kind of preparation method of gaseous mercury sorbent of the present invention comprises the following steps:

[0043] (1) Take 0.05 mol of ferric nitrate and add it to 30 mL of deionized water, stir until it is completely dissolved; then take 0.2 mol of thiourea, add it to the prepared ferric nitrate solution, and ultrasonicate for 15 minutes to ensure the formation of uniform iron-sulfur Urea complex solution;

[0044] (2) Get 15mL of sulfuric acid-cured activated carbon (prepared by the method of Comparative Example 1), add it to the prepared 30mL iron-thiourea complex solution and stir and impregnate for 20min, the stirring speed is 500r / min, and the impregnation temperature is After impregnation at 25°C, filter and dry to obtain a gaseous mercury adsorbent (activated carbon after sulfuric acid aging + iron-thiourea complex impregnation).

[0045] The pure activated carbon adsorbent, the adsorbent samples prepared in Comparative Examples 1-3 and Examples 1-3 were...

Embodiment 3

[0050] Take 0.5g of the adsorbent in Example 1 (activated carbon after sulfuric acid aging+copper thiourea complex impregnation) and the adsorbent prepared in Example 2 (activated carbon after sulfuric acid aging+iron thiourea complex impregnation), fix the flue gas Middle O 2 The concentration is 10v%, the flue gas flow rate is 600mL / min, and the concentration of gaseous mercury in the flue gas is 250μg / m 3 , to investigate the effect of adsorbent on elemental mercury (Hg 0 ) and divalent mercury (Hg 2+ ) removal effect, the results are shown in Table 2.

[0051] Table 2 The removal effect of adsorbents on elemental mercury and divalent mercury at different temperatures and concentrations of sulfur dioxide

[0052]

[0053]

[0054] It can be seen from Table 2 that when the flue gas temperature is in the range of 40-120 °C, the prepared adsorbents can achieve high-efficiency removal of mercury in the flue gas, and the mercury removal efficiency is above 95v%. As hig...

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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...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30B01D53/02
CPCB01J20/20B01J20/223B01D53/02B01D2257/602B01D2258/0283
Inventor 刘志楼李子良徐志峰张溪昝苗苗谷丽果
Owner JIANGXI UNIV OF SCI & TECH
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