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Preparation method, product and application of a magnetic waste-derived mercury removal adsorbent

A waste and adsorbent technology, which is applied in the field of preparation of magnetic waste-derived mercury removal adsorbent, can solve the problems of increasing the operating cost of the power plant, reducing the quality of fly ash, and being unable to recycle, so as to reduce the operating cost of the power plant and increase the Benefits, the effect of short preparation cycle

Active Publication Date: 2020-07-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, further studies have shown that the process still has the following problems: first, in practical applications, the adsorbent is only used for one-time injection, which cannot be recycled, which greatly increases the operating cost of the power plant; second, the enrichment of the adsorbent The carbon content of fly ash is increased in fly ash, which greatly reduces the quality of fly ash; in addition, when the fly ash doped with adsorbent is used as concrete, the Hg in the adsorbent 0 Secondary emissions may occur, polluting the environment

Method used

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  • Preparation method, product and application of a magnetic waste-derived mercury removal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1. Crush and screen waste wood and waste PVC, select waste wood and waste PVC with a particle size of 100 μm to 200 μm for subsequent use, and configure Fe(NO 3 ) 3 solution, with Fe(NO 3 ) 3 Fe(NO 3 ) 3 The solution was added to the waste wood, and the mixing was continued for 30 minutes.

[0036] Step 2. the mixed solution in step 1 is separated to obtain loaded Fe(NO 3 ) 3 waste wood and will be loaded with Fe(NO 3 ) 3 The discarded wood was put into a drying oven and dried at a constant temperature of 105°C for 12h.

[0037] Step 3. load Fe(NO in step 2 3 ) 3 The waste wood in step 1 is fully mixed with the waste PVC in the ratio of 3:1, and then the mixture is put into the tube furnace, and the flow rate of 200ml / min is passed into N 2 Atmosphere, the tube furnace was heated to 700 °C at a rate of 10 °C / min, and kept at a constant temperature for 30 min, and then heated in N 2 Cooling to room temperature in a medium to obtain a magnetically separab...

Embodiment 2

[0040] Step 1. Crush and screen waste paper and brominated epoxy resin, select waste paper and brominated epoxy resin with a particle size of 150 μm to 250 μm for use, and prepare FeCl with a concentration of 0.09wt.% 3 solution with FeCl 3 The ratio of solution to waste paper is 10ml / g FeCl 3 Add the solution to waste paper, and continue to mix and stir for 30 minutes.

[0041] Step 2. The mixed solution in step 1 is separated to obtain the loaded FeCl 3 of waste paper and will be loaded with FeCl 3 The waste paper was dried in a drying oven at a constant temperature of 105 °C for 12 h.

[0042] Step 3. Load FeCl in step 2 3 The waste paper and the brominated epoxy resin in step 1 are fully mixed at a ratio of 1:1, and then the mixture is put into a tube furnace, and N is introduced at a flow rate of 200ml / min. 2 Atmosphere, the tube furnace was heated to 800 °C at a rate of 10 °C / min, and kept at a constant temperature for 10 min, and then heated in N 2 Cooling to room...

Embodiment 3

[0045] Step 1. crush and screen the waste bamboo and waste PVC, select the waste bamboo and waste PVC with a particle size of 200 μm to 300 μm for subsequent use, and configure Fe(NO 3 ) 3 solution, with Fe(NO 3 ) 3 Fe(NO 3 ) 3 The solution was added to the waste bamboo, and the mixing was continued for 20 minutes.

[0046] Step 2. the mixed solution in step 1 is separated to obtain loaded Fe(NO 3 ) 3 waste bamboo, and will load Fe(NO 3 ) 3 The discarded bamboo was dried in a drying oven at a constant temperature of 120 °C for 12 h.

[0047] Step 3. load Fe(NO in step 2 3 ) 3 The discarded bamboo and the discarded PVC in step 1 are fully mixed at a ratio of 5:1, and then the mixture is put into a tube furnace without any gas (that is, in an air atmosphere), and the tube furnace is heated at 15°C / min The temperature was raised to 500°C at a constant rate, and kept at a constant temperature for 60 minutes, and then in N 2 Cooling to room temperature in a medium to ob...

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Abstract

The invention belongs to the technical field relative to power plant flue gas purification and discloses a preparation method, a product and application of a magnetic waste derived mercury removal adsorbent. The preparation method comprises the following steps of adding biomass into an Fe<3+> contained solution, performing full stirring and mixing, and performing separation and drying so as to obtain a solid precursor with Fe<3+> adsorbed to the interior of a gap; and fully mixing the obtained solid precursor with a halogen-contained waste, and performing pyrolysis to produce the magnetic waste derived mercury removal adsorbent. By adopting the preparation method provided by the invention, resource utilization of municipal solid wastes can be realized, the halogen emission such as chlorineis effectively reduced; the magnetic adsorbent with higher mercury removal efficiency is prepared and through the magnetic separation property of the adsorbent, the quality of fly ash can be improved, and mercury secondary emission is reduced; and in addition, the preparation method is easy to control in conditions, relatively short in preparation period, simple in production working procedure and low in preparation cost without using a modified chemical drug in later period and can realize industrialized production of the magnetic waste derived mercury removal adsorbent.

Description

technical field [0001] The invention belongs to the technical field related to flue gas purification of power plants, and more specifically relates to a preparation method, product and application of a magnetic waste-derived mercury removal adsorbent. Background technique [0002] With the rapid development of my country's social economy and the improvement of urbanization level, more and more municipal solid waste (MSW) is continuously produced, and the pollution it brings is also increasing. How to deal with these wastes reasonably It has become one of the most concerned issues at present. [0003] Mercury has attracted widespread attention due to its strong toxicity, persistence, volatility, and bioaccumulation, and coal-fired power plants are considered to be one of the largest sources of anthropogenic mercury emissions. Hg in flue gas 0 Because it is insoluble in water and highly volatile and cannot be removed by flue gas purification devices, activated carbon injectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/10
CPCB01D53/10B01D2257/602B01D2258/0283B01J20/06B01J20/20B01J20/28009
Inventor 罗光前许洋庞淇聪邓芳芳何双无朱海露史梦婷胡靖远姚洪
Owner HUAZHONG UNIV OF SCI & TECH
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