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Method for manufacturing reclaimed soil with iron tailings

A technology for iron tailings and soil is applied in the field of preparing and reclaiming soil by using iron tailings, which can solve the problems of land resources and environmental pollution caused by discharge, and achieve the effects of protecting the environment and alleviating the pressure.

Inactive Publication Date: 2017-05-31
SHENYANG AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If not handled properly, the annual discharge of the above-mentioned wastes will occupy a large amount of land resources and even cause serious pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing reclaimed soil using iron tailings, comprising the following steps:

[0023] Step 1, collecting iron tailings, Quaternary secondary loess and organic materials respectively, for subsequent use;

[0024] The iron tailings are monometallic Anshan high-silicon iron tailings, which are taken from the tailings pond of Benxi Iron and Steel Mining Company's Waitoushan Iron Mine. The loss on ignition of the tailings sand is 0.92%, the pH is 8.16, and the moisture content is 0.06. %, mainly quartz particles, accompanied by a small amount of feldspar and hornblende, monometallic SiO in Anshan high silicon iron tailings 2 The mass fraction of ≥75%. The mass fraction of coarse sand (0.2mm-2mm) is 75.7%, the mass fraction of fine sand (0.02mm-0.2mm) is 23.6%, a small amount of silt, and no clay-grade particles;

[0025] The Quaternary secondary loess is collected from the subsoil 0.7-0.9m below the surface soil stripped by open-pit mining, with a pH of 6.5; ...

Embodiment 2

[0030] A method for preparing reclaimed soil using iron tailings, comprising the following steps:

[0031] Step 1, collecting iron tailings, Quaternary secondary loess and organic materials respectively, for subsequent use;

[0032] Iron tailings take place with embodiment 1;

[0033] The Quaternary secondary loess is taken from the subsoil 0.7-0.9m below the slope surface soil near the Waitoushan Mine, with a pH of 6.5; in the Quaternary secondary loess, the mass fraction of water is 21%, and the particle diameter is less than 0.002mm The mass fraction of the particles is 52.1%, and the organic matter is 12.5g / kg;

[0034] The organic material is taken from the decomposed sludge of Benxi domestic sewage treatment plant. The mass fraction of organic matter in the decomposed livestock and poultry breeding waste is 45% by dry weight; the sludge discharged from the freshly decomposed urban domestic sewage treatment plant The mass fraction of moisture is 30%, the pH value is 8.0...

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Abstract

The invention discloses a method for manufacturing reclaimed soil with iron tailings; the method comprises: collecting iron tailings, quaternary-system secondary losses and organic material respectively, and getting ready for use; mixing well the iron tailings, the quaternary-system secondary losses and the organic materials according to a mass ratio of (45-55):(40-50):5 to obtain reclaimed soil; the organic material is decomposed waste of livestock and poultry industry or composed sludge discharged by urban domestic sewage plants. According to the method for manufacturing reclaimed soil with iron tailings, the iron tails, sludge and livestock and poultry industry waste are used as materials to manufacture reclaimed soil, a mine can be greened, and the wastes such as iron tailings and sludge are utilized comprehensively, the usage of land resources is reduced, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of reclamation and improvement of mine soil, and in particular relates to a method for preparing reclaimed soil by utilizing iron tailings. Background technique [0002] Iron tailings are solid wastes discharged during the beneficiation process. According to incomplete statistics, the amount of tailings stored in my country's existing mines is nearly 5 billion tons, and the annual discharge of tailings is as high as 500 million tons. The tailings ponds for stockpiling tailings occupy a large amount of land resources. Due to the shortage of topsoil sources required for reclamation, ecological restoration is difficult, which has become the main factor restricting mine development and mine ecological restoration. In addition, with the acceleration of my country's urbanization process, the amount of sludge discharged from urban domestic sewage treatment plants is increasing. Disposal of a large amount of sludg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G9/10
CPCA01G24/00
Inventor 吴岩程永维梁成华杜立宇
Owner SHENYANG AGRI UNIV
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