Mine low-dilution mining method for pillarless subsection caving method
A technology of segmental caving method and mining method, which is applied in the low-dilution mining field of mines with the segmental caving method without pillars, and can solve problems such as interference of low-dilution ore drawing work, mixing of waste rocks, and affecting the judgment of on-site constructors , to achieve the effect of improving science and reliability and ensuring recycling
Inactive Publication Date: 2020-09-22
WUHAN UNIV OF SCI & TECH
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Problems solved by technology
Because during the flow of ore and rock bulk, waste rocks are easily mixed with ore, especially waste rocks with small particle sizes, which greatly affects the judgment of on-site construction workers and interferes with the low-dilution ore drawing work. Therefore, it is difficult to obtain the expected low-dilution ore-drawing effect
At present, there is no mature low-dilution mining plan in China. The exploration of low-dilution ore drawing in some mines mostly stays in the improvement of a certain technical part to reduce the dilution rate, such as improving the cut-off grade and optimizing the structural parameters of the stope Wait, these attempts have not fully implemented the idea of low-dilution ore drawing
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[0039] The specific implementation of the mine low-dilution mining method used in the pillarless sub-level caving method according to the present invention will be described in detail below in conjunction with the accompanying drawings.
[0040]
[0041] In this embodiment, the low-dilution mining of Chengchao Iron Mine in Wuhan Iron and Steel Co., Ltd. is taken as an example for illustration. Specifically, such as Figures 1 to 6 As shown, the mine low-dilution mining method provided by this implementation for the non-pillar segmental caving method includes the following steps:
[0042] 1) Extract broken ore samples from the site of Chengchao Iron Mine, construct an ore-drawing model at the end, conduct ore-drawing tests, and obtain the height h of the discharge body 2 and the maximum width r of the discharge body 2 based on the marker particle method m and other data, the obtained data are shown in the following table:
[0043] Table 1. Experimental data of ore drawing a...
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The invention provides a mine low-dilution mining method for sublevel caving without sill pillar. The mine low-dilution mining method comprises the steps that 1, a phase height H in a stope structureis determined; 2, a fixed extracted ore tonnage q (please see the specification for the formula) in ore drawing is determined, in the formula, an h is the height of a drawn-out body of ore (unit: m),the h is equal to 2H, an e is a natural constant, and a, b, and c are parameters related to granular medium flow parameters correspondingly; 3, independent advance of ore breaking L (please see the specification for the formula) in the stope structure is determined , r<m>=alpha*q<beta>, and in the formula, the alpha and the beta are parameters related to the granular medium flow parameters; and the k is coefficient of volumetric expansion of the ore; 4, the access space S (please see the specification for the formula) of the stope structure is determined; 5, the thickness of an ore isolationlayer d is determined, and the d is equal to the height of a loose body minus the height of the drawn-out body of the ore; and 6, mining is implemented based on the parameters determined on the steps.According to the mine low-dilution mining method for the sublevel caving without sill pillar, the rate of dilution can be effectively lowered, the recovery rate is improved, and the mine low-dilutionmining method coincides with development tendency of modern and scientific mining of mines.
Description
technical field [0001] The invention belongs to the technical field of underground mining of metal mines, and in particular relates to a mine low-dilution mining method used in a pillarless segmented caving method. Background technique [0002] Since its introduction into China, the pillarless segmental caving method has been rapidly promoted in domestic metal mines due to its advantages of high production efficiency, low mining cost, and relatively safe working environment, and it is still the main mining method in underground mining until now. The notable feature of the non-pillar sub-level caving method is that the ore is mined under the covering rock layer, and the ore faces serious dilution loss. Therefore, reducing the loss and dilution rate has always been one of the important research topics of the non-pillar sub-level caving method. [0003] The quality of ore drawing results directly determines the ore recovery benefit. The essence of realizing low-dilution mining ...
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IPC IPC(8): E21C41/22
CPCE21C41/22
Inventor 曾文旭王平程爱平许梦国谭涛李丹峰
Owner WUHAN UNIV OF SCI & TECH