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Method for removing heavy metals in fly ash

A fly ash and heavy metal technology, applied in the field of coal chemical industry, can solve the problems of large-scale treatment of wastewater, high cost, and poor economic benefits

Active Publication Date: 2020-11-03
杭州石炭纪环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all treat heavy metal elements in solid waste by leaching or digestion with additional biochemical materials, resulting in a large amount of treated wastewater, which is easy to cause secondary pollution, and the cost is high and the economic benefit is poor.

Method used

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  • Method for removing heavy metals in fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The fly ash is firstly removed from the iron element by the iron remover, and then 0.02% triethanolamine is added and stirred for 15 minutes, and then the powder is dispersed by vibration. The dispersed powder is heated to 150°C in a heater, and then conveyed to an electrostatic separator by pneumatic force to maintain a flow rate of 1m / s and a flue gas concentration of 90g / Nm 3 . In the electrostatic separator, under the action of 7500V high voltage, the coarse particles in the fly ash are enriched on the electrode plate, and the rapping force is 200g every 60min. The two poles of the electrodes were ripped in turn, and the rapping time was 2 min each time.

[0053] The fly ash in the flue gas enters the centrifugal separator. At this time, the intake air velocity is 1.5m / s, the turbine speed in the primary separation chamber is 1000rpm, and the secondary air component is 1500m 3 / h. After passing through the two-stage separation system, the fine particles leave the...

Embodiment 2

[0056] The fly ash is firstly removed from the iron element through the iron remover, and then 0.05% glycerol is added and stirred for 12 minutes, and then the powder is dispersed by vibration. The dispersed powder is heated to 150°C in a heater, and then transported to an electrostatic separator by pneumatic force to maintain a flow rate of 1.2m / s and a flue gas concentration of 110g / Nm 3 . In the electrostatic separator, under the action of 8500V high voltage, the coarse particles in the fly ash are enriched on the electrode plate, and the rapping force is 360g every 75min. The two poles of the electrode were ripped in turn, and the rapping time was 3.5 min each time.

[0057] The fly ash in the flue gas enters the centrifugal separator. At this time, the intake air velocity is 1.5m / s, the turbine speed in the primary separation chamber is 3200rpm, and the secondary air component is 2000m 3 / h. After passing through the two-stage separation system, the fine particles leav...

Embodiment 3

[0060] The fly ash is firstly removed from the iron element by the iron remover, then 0.01% stearic acid is added and stirred for 15 minutes, and then the powder is dispersed by vibration. The dispersed powder is heated to 120°C in a heater, and then transported by pneumatic force to an electrostatic separator to maintain a flow rate of 1.3m / s and a flue gas concentration of 130g / Nm 3 . In the electrostatic separator, under the action of 8000V high voltage, the coarse particles in the fly ash are enriched on the electrode plate, and the rapping force is 440g every 90min. The two poles of the electrode were ripped in turn, and the rapping time was 5 min each time.

[0061]The fly ash in the flue gas enters the centrifugal separator. At this time, the intake air velocity is 1.8m / s, the turbine speed in the primary separation chamber is 3200rpm, and the secondary air component is 3500m 3 / h. After passing through the two-stage separation system, the fine particles leave the up...

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Abstract

The invention provides a method for removing heavy metals in fly ash. The method comprises the following steps of carrying out magnetic separation on pulverized coal ash to remove iron, then adding adispersing agent, uniformly stirring, dispersing by vibration, carrying out electrostatic separation, and screening to obtain fly ash particles with the particle size of 0.1-20 mu m; and enabling thescreened fly ash particles with the particle size ranging from 0.1 micrometer to 20 micrometers to enter a first classification chamber to be subjected to primary centrifugal separation, settling large particles into a second classification chamber, introducing secondary air into the second classification chamber, floating small particles in the large particles upwards to enter the first classification chamber, and screening out the fly ash particles with the average particle size smaller than 10 micrometers. After the fly ash is sequentially subjected to the steps of iron removal, scattering,electrostatic separation, centrifugal separation and the like, fine particles in the fly ash are completely separated out, and a large number of heavy metal elements are enriched in the fine particles, so that the content of the heavy metal elements in the fly ash can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for removing heavy metals in fly ash. Background technique [0002] China is the largest coal producer and consumer in the world, producing about 580 million tons of fly ash every year, and the current stockpile has reached 2.5 billion tons. The accumulation of a large amount of fly ash will cause harm to the ecological environment and human health. Therefore, the comprehensive utilization of bulk fly ash is the focus of green and sustainable development. However, the raw coal itself contains heavy metal elements, some of which will be enriched in fly ash during the coal combustion process, which not only restricts the application of fly ash in water and soil, but also because of the accumulation and migration characteristics of heavy metal elements, and the natural environment. closely related to human health. Therefore, the removal of trace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/30
CPCB03C1/30
Inventor 陈良
Owner 杭州石炭纪环保科技有限公司
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