A kind of preparation method and application of magnetic renewable mercury removing agent

A mercury removal agent and magnetic technology, which is applied in the field of preparation of magnetic renewable mercury removal agents, can solve the problems of large dosage, complicated process, and increased cost, and achieve simple modification process, large application temperature range, and huge environmental benefits Effect

Active Publication Date: 2022-07-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the adsorbents that have been studied mainly include activated carbon, metal sulfides, metal oxides, modified fly ash, calcium adsorbents, precious metals, etc. Activated carbon has been used in the field of mercury removal from coal-fired flue gas, but its mercury removal effect is limited. Working conditions have a great impact, and the amount of use is large, the cost is high, and the activated carbon after adsorbing mercury is difficult to separate from the fly ash, so it cannot be recycled and reused, and the mixing of activated carbon seriously reduces the resource utilization of fly ash; metal oxides, Cheap adsorbents such as modified fly ash and calcium adsorbent have limited adsorption capacity and low mercury removal efficiency, so they are not suitable for the purification of flue gas with high mercury concentration; metal sulfides have superior mercury removal activity and are considered to be a class of It has the greatest potential to replace traditional activated carbon adsorbents, but natural metal sulfide minerals have almost no ability to remove mercury, and metal sulfide adsorbents with high mercury removal efficiency need to be synthesized precisely and precisely by complex precursors and additives. Complex, high cost, and generally cannot be recycled and reused, which greatly increases the cost, increases the operating cost, and hinders its industrial production and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The natural pyrite (Fe 44wB%, S 51wB%) is crushed, dried and screened, and the screened pyrite is placed in a tube furnace, heated to 650° C. under a nitrogen atmosphere, and kept for 60 minutes. Take out after cooling to room temperature naturally. The calcined sample was mixed with copper chloride in a mass ratio of 2:1, mechanically ground and activated in a ball mill at 50 °C for 15 min, dried at 100 °C for 2 h after activation, and sieved through a 200-mesh standard sieve after drying. Magnetic regenerable mercury remover with a measured coercivity of 28mT. Weigh 5mg of mercury removal agent and place it in a simulated fixed bed reactor, generate elemental mercury through a mercury permeation tube, and use a RA-915 mercury meter to measure the mercury concentration in real time. The mass flowmeter accurately controls the gas flow of each component to simulate flue gas. composition, the total gas flow is 1L / min, the initial Hg 0 The concentration is 100±1μg / m3, an...

Embodiment 2

[0043] The natural pyrite (Fe 30wB%, S 32wB%) was crushed, dried and screened, and the screened pyrite was placed in a tube furnace, heated to 600°C under a nitrogen atmosphere, and kept for 120min , and take it out after cooling to room temperature naturally. Mix the calcined sample with cupric chloride in a mass ratio of 1:1, mechanically grind and activate it in a ball mill at 75 °C for 30 min, dry at 120 °C for 8 h after activation, and sieve through a 200-mesh standard sieve after drying to obtain Magnetic regenerable mercury remover with a measured coercivity of 24mT. Weigh 20mg of mercury removal agent and place it in a simulated fixed bed reactor, generate elemental mercury through a mercury permeation tube, and use a RA-915 mercury meter to measure the mercury concentration in real time. The mass flowmeter accurately controls the gas flow of each component to simulate flue gas. composition, the total gas flow is 1L / min, the initial Hg 0 The concentration is 500±5μg / ...

Embodiment 3

[0045] The magnetic mercury remover prepared in Example 1 was tested in a small zinc smelting plant. 3 / h, Hg after electrostatic precipitator 0 Emissions are 3-3.5mg / m 3 , The magnetic mercury remover is added in the form of a fixed bed. The addition amount of the mercury remover is 1.5kg, and the mercury removal efficiency is higher than 92.5% within 1 hour. After the mercury is fully loaded, the mercury remover is separated by magnetic separation. It is placed in an electronically controlled distillation furnace for high temperature desorption, the desorption temperature is 500 °C, and the desorption time is 60 minutes. The mercury vapor escapes into the circulating condensation system to form liquid metal mercury and is collected and stored centrally. The purity of the recovered mercury is higher than 99.9% .

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Abstract

The invention discloses a preparation method and application of a magnetic regenerable mercury removing agent. In the method, the natural iron minerals are roasted at high temperature to remove part of the sulfur and then converted into magnetic iron minerals, added with copper chloride for modification treatment, and activated by mechanical grinding to obtain a magnetic renewable mercury removal agent with excellent mercury removal performance. The magnetic mercury remover is placed in a fixed bed, fluidized bed, wet flue gas purification system or injected into the flue gas, and contacts with the mercury in the flue gas to convert the gaseous mercury into a stable compound and realize the solidification of the gaseous mercury The mercury-loaded mercury-removing agent is separated by magnetic separation, and can be recycled and reused after high-temperature desorption of mercury. The magnetic regenerable mercury-removing agent of the present invention has natural and easily available raw materials, abundant reserves, simple preparation method, large mercury adsorption capacity and fast adsorption rate, can be regenerated and recycled, significantly reduces mercury removal cost, and has good practical value.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution prevention and purification, and in particular relates to a preparation method and application of a magnetic regenerable mercury remover. Background technique [0002] Mercury is a heavy metal pollutant that exists in the environment for a long time and has global migration and diffusion. It is highly toxic, persistent, highly corrosive and volatile, and brings serious harm to human health and the aquatic and terrestrial ecological environment. On October 10, 2013, the Minamata Convention on Mercury was signed in Kumamoto, Japan. In 2017, the Minamata Convention on Mercury officially entered into force in more than 100 countries around the world, indicating that mercury pollution control has not only become the focus of domestic environmental pollution control , and will also be bound by international environmental conventions and assume corresponding performance responsibilities. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/28B01J20/30B01D53/02C02F1/28C02F101/20
CPCB01J20/0229B01J20/0288B01J20/28009B01D53/02C02F1/286C02F2101/20B01D2257/602
Inventor 李海龙孟凡悦杨建平屈文麒杨泽群
Owner CENT SOUTH UNIV
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