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
View PDF0 Cites 12 Cited by
  • 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 car

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0006] Example 1: Take 1000mL of hydrochloric acid with a concentration of 36.5%, add 500g of fly ash, prepare a mixture with a solid-to-liquid ratio of 1:2 (g / ml), and heat it to 48°C in a constant temperature water bath for 2 hours , The fly ash is modified, and then solid-liquid separation is carried out with a centrifuge, and the separated solids are placed in an oven and heated to 100°C for 5 hours. Take 5g of acid-modified and dried fly ash, under the condition of simulating water flow, to treat the Cr content with a pH value of 7, a volume of 1L, and a concentration of 3mg / L 6+ Wastewater, stirring time is 30 minutes, its adsorption rate can reach 89.6%, Cr in the wastewater after treatment 6+ The concentration of <0.5mg / L, in line with the relevant national emission standards.

Example Embodiment

[0007] Example 2: Take 1100 mL of hydrochloric acid with a concentration of 33%, add 500 g of fly ash to prepare a mixture with a solid-to-liquid ratio of 1:2.2 (g / ml), and heat to 42°C for 2.5 hours. Modification is carried out, and then solid-liquid separation is carried out. The separated solids are 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.

Example Embodiment

[0008] Example 3: Take 900ml of 36% hydrochloric acid, add 500g of fly ash to prepare a mixture with a solid-to-liquid ratio of 1:1.8 (g / ml), heat it to 54°C and maintain it for 1.5 hours. Carry out modification, and then carry out solid-liquid separation. Put the separated solids in an oven and heat to 105°C for 4 hours. The modified fly ash can be used for the treatment of chromium-containing wastewater.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01J20/10B01J20/16C02F1/28C02F1/62
Inventor 冯有利于立竟
Owner HENAN POLYTECHNIC UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap