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Method for modification treatment of coal ash

A technology for fly ash and modification, applied in the field of treating nickel-containing wastewater, can solve the problems of low adsorption capacity of fly ash, unable to meet the requirements of nickel discharge, etc., and achieve the effect of remarkable removal effect, low cost and good effect.

Active Publication Date: 2009-05-13
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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Problems solved by technology

[0003] Waste fly ash from power plants can be used to treat nickel-containing wastewater, which is a method of treating waste with waste. However, the adsorption capacity of unmodified fly ash is low, and it cannot be used directly to treat nickel-containing wastewater. The emission requirements for nickel in the Comprehensive Emission Standard (GB8978-1996) (<1mg / l)

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  • Method for modification treatment of coal ash

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[0007] The present invention is described in further detail below by way of examples, a kind of method to fly ash modified treatment, its step is: the sodium hydroxide solution of fly ash and 2mol / L is mixed by the solid-liquid ratio of 1:6 solution, microwave reaction at 85°C for 20 minutes, then stirred at 100°C for 12 hours, washed with deionized water and 95% ethanol after the reaction, then saturated with 1mol / L sodium chloride, and finally heated at 110°C drying to obtain modified fly ash. The fly ash of Shidongkou Power Plant is modified by the present invention, and then the specific surface area of ​​the fly ash before and after modification is measured, and the results are shown in Table 1. It can be seen from Table 1 that the specific surface area of ​​the modified fly ash has increased many times.

[0008] Table 1 Comparison of specific surface area before and after modification of fly ash in Shidongkou Power Plant

[0009]

[0010] Utilize Shidongkou power pl...

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Abstract

The invention discloses a method for modification treatment of pulverized fuel ash. The pulverized fuel ash and a sodium hydroxide solution with the concentration of 2mol / L are prepared into a mixed liquid according to the solid-to-liquid ratio of 1 to 6, the mixed liquid is subjected to microwave reaction for 20 minutes at the temperature of 85 DEG C and then is stirred to react for 12 hours at the temperature of 100 DEG C, deionized water and 95 percent alcohol are used to wash after the reaction is finished, then sodium chloride with the concentration of 1 mol / L is used to saturate, and finally modified pulverized fuel ash is obtained through the drying at the temperature of 110 DEG C. The modified pulverized fuel ash prepared by the method is added into each liter of wastewater containing nickel to ensure that the ash and the wastewater are fully stirred and mixed, and the treatment to the wastewater containing the nickel can be finished at normal temperature. The modified pulverized fuel ash is utilized to treat the wastewater containing the nickel with the concentration of 200 mg / L or so, which has remarkable effect.

Description

technical field [0001] The invention relates to a method for modifying waste fly ash from a power plant. The modified fly ash can be used to treat nickel-containing waste water. Background technique [0002] The industrial discharge of nickel-containing wastewater is large, which is prone to secondary pollution, and can enter the human body through the food chain, causing harm. At present, most of the nickel-containing wastewater is treated by the traditional chemical precipitation method. Although the discharge standard can be met, the amount of chemical agents is large and the cost is high. [0003] Waste fly ash from power plants can be used to treat nickel-containing wastewater, which is a method of treating waste with waste. However, the adsorption capacity of unmodified fly ash is low, and it cannot be used directly to treat nickel-containing wastewater. The emission requirements for nickel (<1mg / l) in the Comprehensive Emission Standard (GB8978-1996). Contents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08C04B20/10
CPCY02W30/91
Inventor 周笑绿卢江涛
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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