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A method of stacking tailings for reclamation purposes

A technology for tailings and purposes, applied in the field of comprehensive utilization of tailings, can solve the problems of not being comprehensively utilized, and there has not been any inter-layer stacking of tailings and plant wastes, so as to achieve timely supply and low price, and improve soil properties. the effect of extending the service life

Inactive Publication Date: 2014-10-22
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, there are also a lot of plant wastes such as crop straws in our country. According to statistics, the production of crop straws in 2010 reached 700 million tons, of which 20% were not comprehensively utilized.
So far, there have been no reports of stacking tailings and plant waste in layers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The homogeneous mixture of wormwood and cow dung (the mass ratio of wormwood and cow dung is 5:1, wherein the wormwood is crushed to ≤10cm) is used as plant waste, and the water content of the plant waste is 72%. Add urea to the vegetable waste, so that the ratio of carbon content to nitrogen content is 15%.

[0028] Stack the above-mentioned plant waste and tailings in the anti-seepage cement pool in an interlayered manner, that is, one layer of tailings, one layer of plant waste, and the last layer is of particle size accounting for 50%. % of the tailings are stacked, and the thickness of each layer is controlled at 25-30cm; the lower part of the pile is subject to being filled with an anti-seepage cement pool, and the part beyond the anti-seepage cement pool is a square platform structure, and the height of the stack is about 1.5m (including The height of the anti-seepage cement pool), and the surface of the pile body is covered with colored strip nylon cloth to prev...

Embodiment 2

[0031] The uniform mixture of corn stalks, pig manure and sheep manure (mass ratio of corn stalks: pig manure: sheep manure = 20:5:1, in which corn stalks are crushed to ≤ 10cm) is regarded as plant waste. The moisture content is 68%.

[0032]The above-mentioned plant waste and tailings are stacked in a stacked manner, that is, one layer of tailings, one layer of plant waste, and the last layer is tailings with a particle size of 40%. Stacking, the thickness of each layer is controlled at 25-30cm; the lower part of the stack is subject to the impermeable cement pool, and the part beyond the anti-seepage cement pool is a square platform structure, and the height of the stack is about 1.5m (including the anti-seepage cement pool. height), the surface of the pile body is covered with colored strip nylon cloth to prevent rain.

[0033] After 14 months of stacking (without turning the pile during the whole stacking process), the plant stems remaining on the 1mm sieve accounted for...

Embodiment 3

[0035] The uniform mixture of corn stalks, pig manure and sheep manure (mass ratio of corn stalks to pig manure and sheep manure: 20:5::1, in which corn stalks are crushed to ≤10cm) is regarded as plant waste. The water content of the waste was 68%. Solid cellulase (Wuxi Jieren Biotechnology Company, enzyme activity 40000U / g) was added to the plant waste, accounting for 5‰ of the plant waste.

[0036] The above-mentioned plant waste and tailings are stacked in a stacked manner, that is, one layer of tailings, one layer of plant waste, and the last layer is tailings with a particle size of 30%. Stacking, the thickness of each layer is controlled at 25-30cm; the lower part of the stack is subject to the impermeable cement pool, and the part beyond the anti-seepage cement pool is a square platform structure, and the height of the stack is about 1.5m (including the anti-seepage cement pool. height), the surface of the pile body is covered with colored strip nylon cloth to prevent ...

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Abstract

The invention discloses a method for stacking tailings for reclamation. According to the method, the tailings are stacked in a plant waste and tailing interbedded stacking mode, the thickness of each layer is controlled to be 5 to 50cm, a top layer of a stack body is a tailing layer with 20 to 50 percent of micro particles, and plant wastes are one or a combination of two of straw, wheat stalks, wheat husks, sweet potato stems, tobacco leaves and stalks, cassava stems and leaves, cassava residues, rice husks, bean stalks, bean husks, distillers' grains, farmyard manure, wormwood, reeds, couch grass, barnyard grass, marsilea quadrifolia, morning glory stems, setaria glauca, eleusine indica and unused shrub or arbor and branches and leaves thereof. By the method, the activity of heavy metal ions in the tailings can be effectively reduced, and heavy metal pollution is reduced; and the tailings stacked by the method can be used as soil for plant growth, replace the conventional mellow soil and are used for the fields of stony desertification control, mine recovery, urban greening and the like.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of tailings, in particular to a method for stacking tailings for the purpose of reclamation. Background technique [0002] Mine tailings refer to the solid "waste" discharged by mining enterprises after sorting ore under certain technical and economic conditions. In order to provide 1 ton of concentrate, more than 1 ton, or even thousands of tons of tailings are often produced. According to statistics, in 2010, the amount of tailings produced in my country reached 1.23 billion tons, and only 172 million tons were comprehensively utilized. At present, tailings have become the bulk solid waste with the largest industrial output. Because tailings usually contain a certain amount of sulfide, when exposed to the air, it is easy to oxidize the sulfide and cause heavy metals to enter the water body in the form of ions, resulting in Heavy metal pollution; in addition, the tailings have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05G3/00C05F17/00B09B3/00
CPCY02W30/40Y02W30/78
Inventor 彭光菊张健伟
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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