Method for ionic rare earth mine tailing land improvement and vegetation reclamation

A technology for rare earth ore and tailings, which is used in land preparation methods, applications, agricultural machinery and implements to achieve the effects of absorbing moisture and dispersing water quickly, promoting dissolution and reducing soil bulk density.

Inactive Publication Date: 2014-07-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects and technical deficiencies of the existing ion-type rare earth ore tailings land remediation and treatment, and to provide a kind of goo

Method used

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  • Method for ionic rare earth mine tailing land improvement and vegetation reclamation
  • Method for ionic rare earth mine tailing land improvement and vegetation reclamation
  • Method for ionic rare earth mine tailing land improvement and vegetation reclamation

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0051] Example 1 Analysis of soil physical and chemical properties of ionic rare earth tailings

[0052] The present invention selects ion-type rare earth mine tailings at different abandonment times (1-10 years) in Dingnan County, Ganzhou City, Jiangxi Province as the investigation object. Through the analysis of soil physical and chemical properties, and compares with the surrounding unexploited normal vegetation areas, analyzes ion-type rare earth Obstacle factors for vegetation reclamation of mine tailings land.

[0053] The main physical and chemical properties of the soil in the tailings of ion-type rare earth mines are as attached figure 1 Shown from figure 1 It can be seen from (a), (b) and (c) that within 10 years of abandonment, the soil clay content of tailings land is less than 10% (6.00%~9.66%), which is much lower than the soil clay content of the surrounding normal vegetation area ( 24.10%~50.48%); soil bulk density of tailings (1.25~1.43 g·cm -3 ) Is significantl...

Example Embodiment

[0055] Example 2 Indoor experiment on soil improvement of tailings by four organic wastes

[0056] 1. The physical and chemical properties of the tested soil and the amendment are shown in Table 1.

[0057] Table 1 Physical and chemical properties of tested soil and amendment

[0058]

[0059] Note: The pH measurement of straw, sawdust and kenaf biochar uses a soil-water ratio of 1:20.

[0060] 2. Indoor experiment on soil improvement of tailings with four organic wastes (Pennisetum)

[0061] The indoor pot experiment was designed with 6 treatments, as shown in Table 2.

[0062] Table 2 Indoor experiment on soil improvement of tailings by four organic wastes (Pennisetum)

[0063]

[0064] The indoor pot experiment was carried out in a greenhouse with a temperature of 24°C-28°C during the day and 18°C-20°C at night. Each treatment is 3 parallel, each pot contains 1.0kg soil and improver, and waters it every other day and balances for about 2 weeks.

[0065] Hybrid pennisetum and kenaf see...

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Abstract

The invention provides an ionic rare earth mine tailing land improver, and a method for improving an ionic rare earth mine tailing land by utilizing the improver and reaching the purpose of vegetation reclamation by planting pennisetumpureum or hibiscus cannabinus. The improver comprises organic wastes of livestock manure or sludge and saw dust or straw biochar. With adoption of the method, the obstruction factors of vegetation reclamation such as low soil moisture and fertility preservation capacity, extremely low organic matter content and nutrient shortage caused by poor physical structure such as low soil clay content of the ionic rare earth mine tailing land, high content of sand grains with diameter greater than 5mm and high volume weight are effectively improved, and the vegetation reclamation of the ionic rare earth mine tailing land is realized; moreover, the improvement effect is lasting, the soil moisture and fertility preservation capacity is high, and the vegetation growth is good. According to the method, the soil of the tailing land can be improved, the pollution is controlled, and the ecological environment is protected; meanwhile, the common organic wastes are utilized as the improver, cyclic utilization of the wastes is realized, pennisetumpureum or hibiscus cannabinus is planted, and great economic values are obtained.

Description

technical field [0001] The invention belongs to the field of treatment and restoration of tailings of rare earth mines. More specifically, it relates to a method for improving ion-type rare earth mine tailings and reclaiming vegetation. Background technique [0002] Ionic rare earth mines are important strategic resources in my country, mainly distributed in Jiangxi, Guangdong, Fujian, Hunan and Guangxi in the south. Among them, Ganzhou City, Jiangxi Province was mined the earliest and had the largest amount of mining, and has also made a great contribution to the local economic development. . However, for a long time, the mining of ion-type rare earth ores, especially in the early stage, often adopts the heap leaching process: that is, the ore rich in rare earths is transported from the weathered layer and semi-weathered layer under the topsoil to the heap leaching site, and is repeatedly leached with ammonium sulfate to obtain At the same time as the rare earth mother liq...

Claims

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Application Information

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IPC IPC(8): A01B79/02
Inventor 汤叶涛刘文深仇荣亮刘畅王志威滕文凯王诗忠
Owner SUN YAT SEN UNIV
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