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Novel preparation process of modified fly ash for processing chrome-containing sewage

A technology of fly ash and a new process, which is applied in the field of treating chromium-containing wastewater, can solve the problem of high cost, achieve low cost and improve adsorption performance

Inactive Publication Date: 2007-07-11
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the treatment of chromium-containing wastewater is one of the environmental problems facing society today. Chemical reagents such as activated carbon are used to treat chromium-containing wastewater. Although the treatment effect can meet the national environmental protection requirements, the cost is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: Take 1000 mL of hydrochloric acid with a concentration of 36.5%, add 500 g of fly ash, and prepare a mixed solution with a solid-liquid ratio of 1:2 (g / ml), heat it to 48° C. in a constant temperature water bath, and keep it for 2 hours , modify the fly ash, and then use a centrifuge to separate the solid from the liquid, put the separated solid in an oven, heat it to 100°C, and dry it for 5 hours. Take 5g of fly ash that has been modified by acid method and then dried, and under the condition of simulated water flow, treat the Cr 6+ For waste water, the stirring time is 30 minutes, and its adsorption rate can reach 89.6%. Cr in waste water after treatment 6+ The concentration of <0.5mg / L, in line with the relevant national emission standards.

Embodiment 2

[0007] Embodiment 2: get 1100mL concentration and be 33% hydrochloric acid, add 500g fly ash, be mixed with the mixed solution that solid-liquid ratio is 1: 2.2 (g / ml), be heated to 42 ℃, maintain 2.5 hours, to fly ash Modification was carried out, followed by solid-liquid separation, and the separated solid was heated to 95° C. in an oven and dried for 6 hours. The modified fly ash can be used for the treatment of chromium-containing wastewater.

Embodiment 3

[0008] Embodiment 3: get 900mL concentration and be 36% hydrochloric acid, add 500g fly ash, be mixed with the mixed solution that solid-liquid ratio is 1: 1.8 (g / ml), be heated to 54 ℃, maintain 1.5 hours, to fly ash Modification was carried out, followed by solid-liquid separation, and the separated solid was heated to 105° C. in an oven and dried for 4 hours. The modified fly ash can be used for the treatment of chromium-containing wastewater.

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PUM

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Abstract

The invention relates to a method for modifying and treating coal powder, used to treat chromic waste water, wherein it uses some alcaine, adds some coal powder to prepare mixture; heats and modifies the coal powder; uses eccentric machine to separate the solid and liquid, dries the solid. Therefore, the coal powder can be converted into new composite with new zeolitic mineral phase, to improve the property of coal powder. The inventive coal powder can treat chromic waste water, with low cost.

Description

technical field [0001] The invention relates to the comprehensive utilization of fly ash, and relates to a new process for modifying and processing fly ash, so that the modified fly ash can be used to treat chromium-containing wastewater. Background technique [0002] At present, the treatment of chromium-containing wastewater is one of the environmental problems faced by today's society. Chemical reagents such as activated carbon are used to treat chromium-containing wastewater. Although the treatment effect can meet the national environmental protection requirements, the cost is too high. Fly ash is one of the wastes of thermal power plants. It is a substance similar to volcanic ash, which contains SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, CaO and unburned carbon, etc. These substances have porosity and large specific surface area (2700~3500cm 2 / g), fly ash has adsorption, coagulation, coagulation aid and precipitation, which are often the result of the combination of severa...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/16C02F1/28C02F1/62
Inventor 冯有利于立竟
Owner HENAN POLYTECHNIC UNIV
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