Mercury-containing waste recovery method

A recovery method and waste technology, applied in the field of mercury treatment, can solve problems such as mercury instability, environmental secondary pollution, low thermodynamic stability, etc., and achieve the effects of uniform heating, high thermal efficiency, and excellent wave-absorbing performance

Active Publication Date: 2015-06-03
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's research and development of mercury removal technology for coal-fired power plants started relatively late, and the industrial application of mercury removal using activated carbon injection technology is significantly less than the industrial application of mercury removal based on wet desulfurization equipment, which is largely limited by activated carbon injection. high cost of technology
In addition, the waste activated carbon after adsorbing mercury has the problem of low thermodynamic stability, and the mercury adsorbed in activated carbon is very unstable, and it is easy to re-enter the environment and cause secondary pollution to the environment

Method used

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Embodiment approach 1

[0027] Implementation mode one: if figure 1 As shown, the recycling method of the mercury-containing waste in this embodiment includes: the mercury-containing waste material (containing mercury μg / m 3 The waste activated carbon containing 150mg / kg of mercury obtained by the flue gas treated by activated carbon injection technology) is placed in a closed microwave reactor, the power of the microwave reactor is adjusted to 1kW, and then the mercury-containing waste material is heated at a rate of 10°C / min From room temperature to 500°C, then pass the mercury-containing waste gas generated by the reaction (the flow rate of the waste gas generated by the cycle reaction is maintained at 600 mL / min) into the washing liquid (the composition of the washing liquid is a mixture of potassium permanganate and sulfuric acid , wherein the concentration of potassium permanganate is 1wt%, the concentration of sulfuric acid is 5wt%; the solid-liquid ratio of the mercury-containing waste materi...

Embodiment approach 2

[0029] Embodiment 2: The recycling method of the mercury-containing waste in this embodiment includes: making the mercury-containing waste material (containing mercury 15 μg / m 3 The waste activated carbon containing 80mg / kg of mercury obtained by the flue gas treated by activated carbon injection technology) is placed in a closed microwave reactor, the power of the microwave reactor is adjusted to 80 kW, and then the mercury-containing waste material is heated up at 900 ℃ / min The rate is increased from room temperature to 900°C, and then the mercury-containing waste gas generated by the reaction (the flow rate of the waste gas generated by the cycle reaction is maintained at 1000 mL / min) is passed into the washing liquid (the composition of the washing liquid is a mixture of potassium permanganate and sulfuric acid liquid, wherein the concentration of potassium permanganate is 3wt%, the concentration of sulfuric acid is 30wt%; the solid-liquid ratio of mercury-containing waste ...

Embodiment approach 3

[0031] Embodiment three: the recovery method of the mercury-containing waste of this embodiment comprises: the mercury-containing waste material (containing mercury 5 μ g / m 3The waste activated carbon containing 100mg / kg of mercury obtained by the flue gas treated by activated carbon injection technology) is placed in a closed microwave reactor, the power of the microwave reactor is adjusted to 60 kW, and then the mercury-containing waste material is heated up at 100°C / min The rate is increased from room temperature to 200°C, and then the mercury-containing waste gas generated by the reaction (the flow rate of the waste gas generated by the cycle reaction is maintained at 200 mL / min) is passed into the washing liquid (the composition of the washing liquid is a mixture of potassium permanganate and sulfuric acid liquid, wherein the concentration of potassium permanganate is 6wt%, the concentration of sulfuric acid is 10wt%; the solid-liquid ratio of mercury-containing waste mate...

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Abstract

The invention relates to a mercury-containing waste recovery method and a device, and belongs to the technical field of mercury treatment. The method comprises steps of: putting mercury-containing wastes into a closed microwave reactor; regulating the power of the microwave reactor to 1-80kW; heating the mercury-containing wastes at the heating rate of 10-100 DEG C / min from the room temperature to 200-900 DEG C; then filling mercury-containing waste gas generated by the reaction into an eluting solution so as to extract mercury; finally, filling the waste gas after mercury extraction into the microwave reactor to circularly react for 3-30 minutes and then stopping the reaction; and taking solid products (mercury-containing wastes after mercury extraction reaction) from the microwave reactor, and briquetting the solid products to be used as fuel. The device comprises the microwave reactor, a gas absorption device and a circulation device, wherein the microwave reactor is sequentially communicated with the gas absorption device and the circulation device so as to form a circulation loop. The method is a novel, efficient, economic and practicable mercury removing technology, and 'zero emission and zero pollution' can be completely realized.

Description

technical field [0001] The invention relates to a method and a device for recycling mercury-containing waste, and belongs to the technical field of mercury treatment. Background technique [0002] Mercury is one of the main heavy metal pollutants in the flue gas of coal-fired power plants, which has the characteristics of acute toxicity, accumulation and persistence. Up to 98% of mercury in industry is elemental mercury, HgO and CH 3 Hg is emitted into the atmosphere, and it brings great harm to human beings and other organisms. According to reports, the current global anthropogenic mercury emissions are 4000 t / a, and about 31% of the mercury in the atmosphere comes from coal combustion in coal-fired power plants. Therefore, global mercury pollution has attracted more and more attention. [0003] As of the end of 2010, my country's installed power capacity has reached 962 million kilowatts, ranking second in the world, of which thermal power is 707 million kilowatts, accou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B43/00
Inventor 张利波彭金辉左勇刚王田陈裹马爱元
Owner KUNMING UNIV OF SCI & TECH
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