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A solid modified composite molecular sieve mercury removal agent and its preparation method

A technology of sieve mercury removal agent and molecular sieve, which is applied in the field of solid modified composite molecular sieve mercury removal agent and its preparation, can solve the problems of short survival time, high energy consumption, and low removal efficiency, and achieve strong mercury removal performance , large specific surface area, good thermal stability

Inactive Publication Date: 2017-06-16
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon adsorbents have a high removal efficiency for all forms of mercury, reaching over 90%, and can remove other types of toxic gases at the same time, but there are also disadvantages such as low cost performance for large-scale use
The efficiency of mercury removal from fly ash is unstable; the removal efficiency of Hg0 by calcium-based substances is low, which can only reach 10% to 20%; the gas oxidation method mainly realizes the removal of Hg0 0 Convert to Hg 2+ , the efficiency is closely related to the gas components to be oxidized, and the operation is simple, but the gas productivity for oxidation is low and the preparation cost is high; the hydroxyl radical oxidation technology has high efficiency, but the OH survival time is short, energy consumption is large, and the efficiency is not high , It is difficult to run stably for a long time

Method used

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  • A solid modified composite molecular sieve mercury removal agent and its preparation method
  • A solid modified composite molecular sieve mercury removal agent and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Weigh 100g of MFI type ZSM-5 (silicon-aluminum ratio: 50) molecular sieve and place it in a muffle furnace for 2 hours at 600°C and then take it out to remove trace impurities of ZSM-5 molecular sieve and eliminate the impact on subsequent experiments.

[0061] Then weigh 9 parts of ZSM-5 molecular sieves calcined at 600°C, each part has a mass of 10g, and 8 parts of them have a mass of 1.0g, 1.2g, 1.4g, 1.6g, 1.8g, 2.0g, 2.2g , 2.4g K 2 FeO 4 Carry out solid ion exchange, mix well and put it into a muffle furnace for 150°C roasting for 12 hours, then cool it and take it out for use.

[0062] Take 4g of each ZSM-5 molecular sieve mercury removal agent roasted at 150°C, react continuously at 30°C for 80min, and measure the 2 FeO 4 (0.0g, 1.0g, 1.2g, 1.4g, 1.6g, 1.8g, 2.0g, 2.2g, 2.4g) the concentration of the modified ZSM-5 molecular sieve mercury removal agent corresponding to the absorption solution, and calculate the mercury removal efficiency respectively 55.6%, ...

Embodiment 2

[0064] Weigh 100g of MFI type ZSM-5 (silicon-aluminum ratio: 50) molecular sieve and place it in a muffle furnace for 2 hours at 600°C and then take it out to remove trace impurities of ZSM-5 molecular sieve and eliminate the impact on subsequent experiments.

[0065] Then weigh 10g of ZSM-5 molecular sieve calcined at 600°C, and 1.6g of K 2 FeO 4 Carry out solid ion exchange, mix well and put it into a muffle furnace for 150°C roasting for 12 hours, then cool it and take it out for use.

[0066] Take 4g of ZSM-5 molecular sieve mercury removal agent roasted at 150°C and react at 80°C for 120 minutes. Measure the concentration of the absorption solution every 10 minutes and calculate the removal efficiency of elemental mercury, 10 minutes , 20min, 30min, 40min, 50min, 60min, 70min, 80min, 90min, 100min, 110min, 120min corresponding to the mercury removal efficiencies are 84.5%, 85.3%, 84.0%, 83.2%, 83.1%, 83.2% , 80.5%, 77.5%, 75.2%, 57.0%, 48.5%, 47.3%.

Embodiment 3

[0067] The influence of embodiment 3 ammonia water immersion on mercury removal efficiency

[0068] First weigh 100g of molecular sieve and put it into a muffle furnace for 2 hours of roasting at 600°C, then take it out to remove trace impurities of molecular sieve and eliminate the influence on subsequent experiments.

[0069] Then carry out ammonia water impregnation experiment, drying and roasting.

[0070] Get 10 parts of ZSM-5 molecular sieve that 4g has removed impurity, respectively in different concentration (0.5mol / L-6.0mol / L) ammonia monohydrate (NH 3 ·H 2 O) for 6-8 hours, take it out and put it in an oven to dry at 120°C for 6 hours, then place it in a muffle furnace and bake at 120°C-600°C for 2-6 hours; after reacting at 30°C for 10 minutes, measure The adsorption efficiency is shown in Table 1.

[0071] Table 1 Effect of ammonia impregnation on mercury removal efficiency

[0072]

[0073]

[0074] In addition, the molecular sieve impregnated with ammon...

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Abstract

The invention relates to a solid-modified composite molecular sieve mercury removal agent and a preparation method thereof. The composite molecular sieve mercury removal agent described in the invention mainly uses strong catalytic oxidation substances to modify molecular sieves with special skeleton structures to form composite mercury removal agents. The selected molecular sieve framework itself also has strong mercury removal performance, and the molecular sieve has a large specific surface area, good thermal stability, and high mechanical strength. It is an excellent carrier for strong catalytic oxidation substances, rich in raw materials, and can be synthesized artificially; Molecular sieve mercury removal agent can efficiently remove mercury vapor in flue gas, with high mercury removal efficiency, simple process, and no secondary pollution; it can be used independently or in combination with existing purification equipment, and can recover mercury Repeated use after simple substance.

Description

technical field [0001] The invention relates to a mercury removal agent in the field of waste gas treatment, in particular to a solid modified composite molecular sieve mercury removal agent and a preparation method thereof. Background technique [0002] The emission and pollution control of mercury is a hotspot in environmental protection. Its vapor pressure is low, volatile, and it is a global pollutant. It widely exists in the atmosphere, water, and soil, and it is continuously cycled under the action of natural forces. Usually, the emission concentration of mercury from coal-fired power stations is 0.1-0.6 mg / m 3 , while the concentration of mercury discharged from waste incineration is 10-100mg / m 3 between. With the acceleration of industrialization, the accumulation of mercury in the atmosphere is also increasing, seriously exceeding the background value of mercury in nature. The research on mercury removal from flue gas is developing rapidly at home and abroad, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30B01D53/82B01D53/64
Inventor 王海宁刘红芳
Owner JIANGXI UNIV OF SCI & TECH