Method for improving phosphorus condition of soil based on reutilization of red mud-based composite solid waste material

A red mud-based, red mud technology, applied in the field of solid waste modification and reuse, can solve the problems of secondary pollution, less reuse of inorganic elements after adsorption, easy to pollute soil and groundwater, etc., and achieve good adsorption effect

Active Publication Date: 2020-01-07
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing research mainly focuses on the application of red mud composite materials to the removal of heavy metals in soil and sewage. Although this method has a certain effect, the materials after adsorbing heavy metals become new hazardous wastes, and the materials after adsorption are often solidified and stabilized. Landfilling becomes new waste, which easily pollutes soil and groundwater
In addition, the materials after absorbing heavy metals should be treated as hazardous wastes according to the relevant regulations. The cost is high and there is a risk of secondary pollution.
At present, there are few researches and inventions on red mud composite materials for the adsorption and reuse of inorganic elements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] Red mud-based composite solid waste material soil phosphorus improvement experiment:

[0036] 850g of sintering red mud, 100g of fly ash, 50g of cement and an appropriate amount of water were evenly stirred and then manually granulated with a soil sieve. Put it in microwave equipment for 10 minutes and microwave at 800W. After taking it out, put it into a muffle furnace at 800°C to activate it for 15 minutes, take it out and let it cool naturally. The modified material was placed in 50ml / L phosphorus-containing wastewater (prepared by potassium dihydrogen phosphate), and fully oscillated and adsorbed in a constant temperature shaker at 25°C for 24h. Filter the adsorption solution and take out the material and dry it for later use. Get 3kg of surface soil and mix evenly, adopt the national standard "determination of total phosphorus in soil, molybdenum antimony anti-spectrophotometry method" and national standard "determination of soil available phosphorus sodium bicarb...

Embodiment approach 2

[0038] Preparation and application of modified red mud-based composite solid waste material soil phosphorus condition improver:

[0039] Take 8.5kg of sintering red mud, 1kg of fly ash, and 0.5kg of cement plant waste into the mixer, add an appropriate amount of water to it, mix well, put the materials into the disc granulator, and use the belt conveyor to transport the mud to the round granulator. On the top of the disc, continuously quantitatively feed into the disc, and the material in the disc is bonded and wrapped into granules by the sprayed adhesive. Put the granulated material in microwave equipment for 10 minutes and microwave at 800W. After taking it out, put it into a muffle furnace at 800°C to activate it for 15 minutes, take it out and let it cool naturally. Take a certain amount of industrial wastewater from a phosphorus fertilizer factory, put the cooled material into it and continuously stir it with a mixer for 24 hours, filter it after natural precipitation, a...

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Abstract

The invention provides a method for improving the phosphorus condition of soil based on reutilization of a red mud-based composite solid waste material. The method comprises the following steps: 1, mixing red mud with fly ash, cement and water, granulating the obtained mixture, and carrying out calcination-microwave activation treatment on obtained granules to obtain the red mud-based composite solid waste material; 2, applying the red mud-based composite solid waste material to phosphorus-containing wastewater adsorption; and 3, adding the red mud-based composite solid waste material subjected to phosphorus adsorption into acidic phosphorus-deficient soil in order to compensate phosphorus for the phosphorus-deficient soil and improve alkaline soil. The red mud-based composite solid wastematerial is activated by adopting a calcination-microwave combined activation process, the activated red mud-based composite solid waste material is applied to adsorption of inorganic element phosphorus in sewage, and the adsorbed material is applied to acidic phosphorus-deficient soil regions. Compared with a traditional environmentally-friendly red mud material, the red mud-based composite solidwaste material has the advantages of environmentally-friendly activation process, high activation material adsorption capability, high phosphorus removal efficiency and high solid waste utilization rate.

Description

technical field [0001] The invention belongs to the technical field of modification and reuse of solid waste, and more specifically relates to a method for improving soil phosphorus status based on red mud-based composite solid waste material reuse. Background technique [0002] Phosphorus is an important element in the soil and an essential element for plant growth. The amount of phosphorus is directly related to the quality of soil fertility. The average density of total phosphorus and available phosphorus in soil in my country is 0.6g / m3 2 and 3.4g / m 2 , the increase in temperature and precipitation will lead to the rapid release and loss of phosphorus in the soil. Therefore, there is a lack of phosphorus in the soil in tropical and subtropical regions of my country, especially in brick red soil, which seriously restricts plant growth, agricultural development and economic development. [0003] Red mud is the residue produced in the production process of alumina. It is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B01J20/10B01J20/30C02F1/28C02F101/10
CPCB01J20/10B09C1/00C02F1/281C02F2101/105
Inventor 赵雅琴马梓涵牛梓璇王丽萍徐铭洋何士龙
Owner CHINA UNIV OF MINING & TECH
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