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Garbage treatment equipment and method based on combination of magnetic separation and microwave regeneration

A waste treatment equipment and microwave treatment technology, applied in the field of waste incineration fly ash treatment, can solve the problems of waste of resources, complex dehydration and drying processes, and the inability to eliminate potential dangers of dioxins, and achieve the effect of reducing consumption.

Pending Publication Date: 2022-07-15
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the cement solidification method is generally used in China to treat fly ash. The high content of activated carbon in fly ash not only leads to a great increase in cement consumption of traditional fly ash cement solidification method, but also turns activated carbon into useless resources, resulting in a huge waste of resources. At the same time, it cannot be eliminated. Potential Dangers of Dioxins
At the same time, the one-time consumption of a large amount of expensive activated carbon leads to an increase in the flue gas cost of waste incineration enterprises
[0003] Aiming at the large amount of carbon components such as activated carbon in incineration fly ash, patent 201610644658.5 discloses a medical waste treatment equipment and its treatment method based on flotation combined with microwave method. By using this method, fly ash is separated into residual slurry and carbon-rich The two products are fine ash, and then the carbon-rich fine ash is dried and granulated and then treated with microwaves to realize the decomposition of dioxin and the regeneration of activated carbon, but this technology belongs to the wet process, and the tail ash and carbon-rich fine ash products after flotation Complicated dehydration and drying processes are also required before processing
Patent 201920687764.0 discloses a waste treatment equipment based on triboelectric separation combined with microwave regeneration. The carbon-rich fine ash and tail ash are obtained by electric separation, and the carbon-rich fine ash enters the microwave treatment furnace to realize activated carbon regeneration and dioxin decomposition. This process is dry However, the fly ash needs to be fully mixed with modifiers and regulators before tribocharging, and the "agglomeration phenomenon" is prone to occur in the electrification process

Method used

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  • Garbage treatment equipment and method based on combination of magnetic separation and microwave regeneration

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Experimental program
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Effect test

Embodiment 1

[0023] The preparation of magnetic activated carbon uses coconut shells as raw materials. The coconut shells are washed with distilled water, dried at 105°C, pulverized and ground into particles, sieved into 0.45-0.9mm particles, and heated to 500°C at a heating rate of 10°C / min under nitrogen atmosphere. , kept for 1 h and cooled to room temperature to obtain activated carbon. According to the molar ratio Fe 3+ : Fe 2+ =1:1 ferric chloride and ferrous sulfate were dissolved in deionized water, added activated carbon, mechanically stirred for 4 h, heated the mixture to 80°C, and added dropwise ammonia (5mol / L) under stirring until the solution was reached. The pH value is equal to 10. After 5 hours of constant temperature at 80 °C, cool it to room temperature in the air, and repeatedly perform suction filtration cleaning until the pH of the cleaning solution is 7. Dry the filtered sample at 110 °C, grind it, and screen out the 300-mesh to 200-mesh samples. That is to make ma...

Embodiment 2

[0026] Using the same preparation method of magnetic activated carbon as in Example 1, only Fe 3+ with Fe 2+ The molar ratio was changed to 2:1. The magnetic activated carbon is sprayed into the flue, and enters the waste incineration fly ash collected by the bag filter with the flue gas, and the incineration fly ash is sent to the magnetic separator for separation. Ash, the dioxin content in the magnetic activated carbon was 7.56ng-TEQ / g, and it was sent to a microwave treatment furnace for microwave treatment. During the treatment process, N was kept in the microwave treatment furnace. 2 Atmosphere, the power of the microwave treatment furnace is 1500W, the heating time is 5min, the dioxin content after treatment is 0.29ng-TEQ / g, and the microwave treatment realizes the effective regeneration of the magnetic activated carbon. The rate drops to 67.92%, and the tail ash can be solidified by adding a small amount of cement and then sent to the domestic waste landfill for land...

Embodiment 3

[0028] Using the same preparation method of magnetic activated carbon as in Example 1, only Fe 3+ with Fe 2+The molar ratio was changed to 3:2. The magnetic activated carbon is sprayed into the flue, and enters the waste incineration fly ash collected by the bag filter with the flue gas, and the incineration fly ash is sent to the magnetic separator for separation. Ash, the dioxin content in the magnetic activated carbon was 7.31ng-TEQ / g, and it was sent to the microwave treatment furnace for microwave treatment. During the treatment process, N was kept in the microwave treatment furnace 2 Atmosphere, the power of the microwave treatment furnace is 1600W, the heating time is 4min, the dioxin content after treatment is 0.28ng-TEQ / g, and the microwave treatment realizes the effective regeneration of the magnetic activated carbon. The rate drops to 63.92%, and the tail ash can be solidified by adding a small amount of cement and then sent to the domestic waste landfill for land...

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Abstract

The invention discloses garbage treatment equipment and method based on combination of magnetic separation and microwave regeneration, household garbage is incinerated through equipment such as a grate furnace, a semi-dry absorption tower, an activated carbon ejector and a bag-type dust collector, and dioxin in incineration flue gas is removed through magnetic activated carbon ejection and the bag-type dust collector. The magnetic activated carbon adsorbing the dioxin is transferred into the incineration fly ash; the fly ash is subjected to magnetic separation to obtain tail ash and magnetic activated carbon enriched with high-concentration dioxin, so that separation of the dioxin and the activated carbon in the fly ash is realized; then the magnetic activated carbon enriched with high-concentration dioxin is subjected to microwave treatment, dioxin in fly ash is decomposed, the magnetic activated carbon is regenerated, and the regenerated magnetic activated carbon serves as an adsorbent and returns to the activated carbon preparation tank to be reused for multiple times. According to the invention, magnetic separation and microwave treatment technologies are combined to realize separation, regeneration and multiple cyclic utilization of magnetic activated carbon, and the consumption of expensive activated carbon and the operation cost of a waste incineration plant are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of waste incineration fly ash treatment, and in particular relates to a waste treatment device and method based on magnetic separation combined with microwave regeneration. Background technique [0002] With the increasing demand for "reduction, recycling, and harmless" treatment of municipal solid waste, my country's waste incineration has developed rapidly in recent years, and landfill methods are no longer suitable for my country's current "more people and less land" basics. National conditions and the rapid development of urbanization process, the proportion of urban domestic waste landfill treatment in the country will drop from 66% in 2015 to 43% in 2020, and by the end of 2020, the national urban domestic waste incineration scale will reach 591,400 ton / day, the proportion of processing scale will reach 54%. In order to strictly control the emission of toxic substances in the incineration process, in 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/06B01J20/20B01J20/28B01J20/34B01J20/30
CPCB01D53/06B01J20/20B01J20/28009B01J20/3416B01J20/3441B01J20/34B01D2257/2064B01D2258/0291
Inventor 刘汉桥龚永月魏国侠
Owner TIANJIN CHENGJIAN UNIV