Preparation method of red mud-slag-cement composite dephosphorization agent

A technology for removing phosphorus and slag, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc. It can solve the problems of uneven activation degree inside and outside the material, high preparation cost and condition requirements, and surface layer of the material. Problems such as thermal gradient difference, achieve the effect of shortening the microwave activation time, improving the resistance to hydraulic shock load, and increasing the hydration hardness

Pending Publication Date: 2019-05-10
CHINA UNIV OF MINING & TECH
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The red mud powder material modified by chemical means has good phosphorus removal performance, but the preparation cost and conditions are relatively high, and it is difficult to recycle and regenerate the material after use; and chemical means are often used for acid pretreatment, which is harmful to the environment. certain pollution
The thermal activation method can form a pore structure inside the red mud particles and increase the specific surface area, but the temperature required for

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

[0029] Example 1:

[0030] After the red mud, slag and cement are dried and crushed, they are passed through a 100-mesh sieve, and then dried to a constant weight at 105°C; according to the mass ratio of red mud, slag, and cement 85%: 15%: 0%, add an appropriate amount Deionized water is mixed uniformly with a water-cement ratio of 0.5, and raw meal particles with a diameter of 5-8mm are produced by a granulator; the raw meal is activated at a microwave power of 500w for 30 minutes to obtain a new type of phosphorus removal agent, which is used in wastewater Removal of phosphate.

[0031] Weigh 0.1g of the activated phosphorus removal agent, add it to 25mL, 50mg / L phosphorus-containing solution, and perform the phosphorus removal test in a constant temperature shaking box. The constant temperature test conditions are 25°C, running time 4h, and vibration speed 100rpm. The phosphorus removal efficiency by this method is 86.3%.

Example Embodiment

[0032] Example 2:

[0033] After the red mud, slag and cement are dried and crushed, they are passed through a 100-mesh sieve, and then dried to a constant weight at 105°C; according to the mass ratio of red mud, slag, and cement 85%: 10%: 5%, add an appropriate amount Deionized water is mixed uniformly with a water-cement ratio of 0.5, and raw meal particles with a diameter of 5-8mm are produced by a granulator; the raw meal is activated at a microwave power of 500w for 20 minutes to obtain a new phosphorus removal agent, which is used in wastewater Removal of phosphate.

[0034] Weigh 0.1g of the activated phosphorus removal agent, add it to 25mL, 50mg / L phosphorus-containing solution, and perform the phosphorus removal test in a constant temperature shaking box. The constant temperature test conditions are 25°C, running time 4h, and vibration speed 100rpm. The phosphorus removal efficiency by this method is 85%. (In this example, the amount of cement is appropriately added, a...

Example Embodiment

[0035] Example 3:

[0036] After the red mud, fly ash and cement are dried and crushed, they are passed through a 100-mesh sieve and then dried to a constant weight at 105°C; according to the mass ratio of red mud, fly ash and cement 75%: 20%: 5% , Add appropriate amount of deionized water, mix uniformly with a water-cement ratio of 0.5, and make raw meal particles with a diameter of 5-8mm through a granulator; activate the raw meal at a microwave power of 500w for 20 minutes to obtain a new type of phosphorus removal agent , Used in the removal of phosphate in wastewater.

[0037] Weigh 0.1g of the activated phosphorus removal agent, add it to 25mL, 50mg / L phosphorus-containing solution, and perform the phosphorus removal test in a constant temperature shaking box. The constant temperature test conditions are 25°C, running time 4h, and vibration speed 100rpm. The phosphorus removal efficiency by this method is 84.7%.

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

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method of a red mud-slag-cement composite dephosphorization agent, comprising the steps of drying the materials of red mud, slag and cement, crushing, screening, drying to constant weights, and mixing well in a certain ratio; mixing the mixture with deionized water to obtain raw particles; subjecting the raw particles to microwave activation, and cooling to room temperature to obtain the red mud-slag-cement composite dephosphorization agent. All the red mud, slag and cement have high calcium oxide content; phosphates in water are removed in calcium phosphate form via calcium-based components; iron oxide in the red mud and slag are heated quickly under the action of microwave, so that calcining is achieved; hydrated minerals, carbonate minerals and the like in the red mud and slag decompose easily and easily release water or gas, and pore structures are formed in the particles; the slag has incompletely combusted ash in a certain ratio, and pore forming can also be achieved in the microwave activation process.

Description

technical field [0001] The invention relates to a method for preparing a phosphorus removal agent by using red mud, slag and cement as raw materials through microwave activation, and belongs to the field of comprehensive utilization of red mud. Background technique [0002] Excessive nutrients such as nitrogen and phosphorus in the water will cause eutrophication of the water body, resulting in the rapid reproduction of algae and other plankton, a decrease in the dissolved amount of the water body, deterioration of water quality, and massive death of fish and other organisms. Eutrophication of water body seriously affects water quality and destroys ecological environment. Therefore, in order to prevent the occurrence of eutrophication in water bodies, in addition to controlling the discharge of phosphorus at the source, it is very important to find an economical and environmentally friendly phosphorus removal agent. [0003] Red mud has the characteristics of fine particles...

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): B01J20/12B01J20/30C02F1/28C04B28/00C02F101/10C04B111/74
Inventor 赵雅琴徐铭洋王丽萍马梓涵牛梓璇赵一帆
Owner CHINA UNIV OF MINING & TECH
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