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Method for magnetically separating and removing ion from fly ash

A technology for removing iron and fly ash by magnetic separation, applied in high gradient magnetic separators and other directions, can solve the problems of difficult to completely remove iron impurities, difficult to separate iron impurities from fly ash, poor iron removal effect, etc. obvious effect

Inactive Publication Date: 2010-10-27
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the content of iron impurities in the fly ash is low (when the content of iron oxide is less than 5%), it is difficult to completely remove the iron impurities because the iron impurities are difficult to separate from the fly ash.
Therefore, for fly ash with low iron content, the iron removal effect of the prior art is relatively poor

Method used

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  • Method for magnetically separating and removing ion from fly ash
  • Method for magnetically separating and removing ion from fly ash
  • Method for magnetically separating and removing ion from fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Get fluidized bed ash and add water to make the slurry that solid content is 33%, carry out magnetic separation under the magnetic field of 1.75Gs with vertical ring magnetic separator, after each magnetic separation, get the slurry after 10 grams of magnetic separation, through After drying at 110°C, detect the content (wt%) of ferric ions (TFe2O3) and ferrous ions (FeO), and after three times of magnetic separation, the content of ferric ions is lower than the predetermined value of 0.8wt%, reaching 0.7wt% . The slurry was discharged, and the discharged slurry was press-filtered with a basket filter press to obtain a filter cake with a solid content of 37.5%. The chemical composition of described filter cake is as shown in table 2 (wt%):

[0045] SiO 2

[0046] Table 2

Embodiment 2

[0053] Get the fluidized bed ash and add water to make a slurry with a solid content of 20%, and carry out magnetic separation under a magnetic field of 1.5Gs with a vertical ring magnetic separator. After each magnetic separation, get 10 grams of the slurry after the magnetic separation. After drying at 110°C, the content (wt%) of ferric ion (TFe2O3) and ferrous ion (FeO) was detected, and after magnetic separation three times, the content of iron ion was equal to the predetermined value of 0.8 wt%. The slurry was discharged, and the discharged slurry was press-filtered with a basket filter press to obtain a filter cake with a solid content of 45.0%. The chemical composition of described filter cake is as shown in table 4 (wt%):

[0054] SiO 2

[0055] Table 4

Embodiment 3

[0062] Get the fluidized bed ash and add water to make a slurry with a solid content of 20%, and carry out magnetic separation under a magnetic field of 2.0Gs with a vertical ring magnetic separator. After each magnetic separation, get 10 grams of the slurry after the magnetic separation. After drying at 110°C, detect the content (wt%) of ferric ions (TFe2O3) and ferrous ions (FeO), and after three times of magnetic separation, the content of ferric ions is lower than the predetermined value of 0.8wt%, reaching 0.75wt% . The slurry was discharged, and the discharged slurry was press-filtered with a basket filter press to obtain a filter cake with a solid content of 50.0%. The chemical composition of described filter cake is as shown in table 6 (wt%):

[0063] SiO 2

[0064] Table 6

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Abstract

The invention discloses a method for magnetically separating and removing ion from fly ash, which comprises the following steps: configuring the fly ash into slurry with preset solid content; carrying out magnetic separation to the slurry with a vertical magnetic separator; detecting the ion content of the slurry after magnetic separation; when the iron content in the slurry is less than or equal to preset content, discharging the slurry; and when the iron content in the slurry is higher than the preset content, carrying out magnetic separation again to the slurry through the vertical magnetic separator. The method for magnetically separating and removing ion from fly ash can more thoroughly remove the ion impurity under the circumstance that the iron impurity content in the fly ash is low, and has significant iron removing effect.

Description

technical field [0001] The invention relates to a method for removing iron by magnetic separation of fly ash. Background technique [0002] Fly ash is a waste discharged from coal-fired power plants. The discharge of fly ash not only occupies a large amount of land, but also seriously pollutes the environment. How to deal with and utilize fly ash has become a very important issue. On the other hand, fly ash contains a variety of components that can be used, such as alumina, silicon oxide, etc. If these useful components are extracted, the fly ash can be used comprehensively. [0003] However, during the extraction process of the useful components of fly ash, the iron oxide contained in the ash has always existed as an impurity. During the extraction process, the presence of iron will affect the purity of the extract. Therefore, removing iron from fly ash is of great significance to improve the purity of useful components and improve the comprehensive utilization rate of fly...

Claims

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Application Information

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IPC IPC(8): B03C1/025B03C1/031
Inventor 郭昭华张文辉魏存弟董宏
Owner CHINA SHENHUA ENERGY CO LTD
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