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Full tailings stacking method for overburden layer under transition from open-pit to underground pillarless sublevel caving method

A segmental caving method, open-pit to underground technology, applied in the field of open-pit to underground sub-pillar caving method covering layer full tailings stacking, can solve the problem of insufficient storage capacity of mine tailings storage, achieve mechanical properties up to standard, The effect of prolonging the service life and water retention and flow performance

Inactive Publication Date: 2019-12-13
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adopting this technology can make full use of the open-pit left over from open-pit mine mining as the site selection for full tailings stacking, so as to solve the problem of tailings stockpiling in tailings ponds, and solve the problem of insufficient mine tailings storage capacity from the source It helps to build green mines, achieve a safe and smooth transition from open pit to underground, and ensure safe underground mining and the safety of underground workers

Method used

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  • Full tailings stacking method for overburden layer under transition from open-pit to underground pillarless sublevel caving method
  • Full tailings stacking method for overburden layer under transition from open-pit to underground pillarless sublevel caving method
  • Full tailings stacking method for overburden layer under transition from open-pit to underground pillarless sublevel caving method

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Embodiment

[0045] The invention provides a method for stacking full tailings in the overburden of the open-pit to underground pillar-less subsection caving method. The process is as follows figure 2 As shown, the specific steps are as follows:

[0046] 1. Detection and analysis of the whole tailings flowing out of the dense pool bottom of an iron ore plant. The detection and analysis content includes tailings particle size, mineral composition, mineral content, natural settlement, and natural accumulation; the mineral composition of iron tailings is shown in Table 1. , particle size such as image 3 Shown:

[0047] Table 1 Analysis results of the whole tailings of an iron ore (%)

[0048]

[0049] Pipeline Requirements:

[0050] ①The basic requirement of slurry particle size composition is that the content of -20μm is not less than 15%. Sand-20μm content 15%-20%, meet the requirements;

[0051] ② The slump range of gravity conveying slurry is 23-27cm, (in this embodiment, the sl...

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Abstract

The invention provides a full tailings stacking method for overburden layer under transition from open-pit to underground pillarless sublevel caving method. The stacking method comprises the followingsteps of concentrating full tailings flowing out of a dense pond bottom of a beneficiation factory into high-concentration tailings with the mass concentration of 60% to 65%, and adding a tailing curing agent, mixing and stirring uniformly to obtain a full tailings backfilling material; and conveying the full tailings backfilling material through a pipeline to an ore-rock overburden layer of a mine mined through the pillarless sublevel caving method for layered / zonal fixed-point discharging, and discharging water in the upper layer of the backfilling material in time through using a water pump through natural dehydration or laying of a drain pipe, so that the water content of the full tailings backfilling material stacked is not greater than 20%. According to the method, the existing openpit is reasonably utilized, and the stacking problem of mine waste residues (waste rock and full tailings) is solved; in particular, the stacking pressure of a mine tailing pond is relieved, and theservice life of the mine tailing pond is prolonged; and meanwhile, the stacking technology and the infiltration technology are feasible, and the safe and stable transition from open-pit to undergroundis guaranteed.

Description

technical field [0001] The present invention relates to the technical field of pillarless segmental caving mining, and specifically relates to a method for stacking full tailings in the overburden of the pillarless segmental caving method from open pit to underground. Background technique [0002] In recent years, with the rapid development of mining technology and mining economy, and the increasingly strict national environmental protection policies, the construction and development of green and sustainable mines are vigorously advocated. For mines with deep mineral resources, open-pit mining is important in terms of safety, economy and environmental protection. It is no longer applicable, and switching from open pit to underground mining is an inevitable choice. However, the transition from open-pit mining to underground mining is mainly manifested in the reduction of production in open-pit mining and the increase in production in underground mining, and there are generall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/32E21C41/30E21C41/22
CPCE21C41/22E21C41/30E21C41/32
Inventor 邢军邱景平孙晓刚李翠王海龙赵英良
Owner NORTHEASTERN UNIV
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