Method and device for reducing mixing rate of small riverside iron ore mining waste rocks

Abstract

The invention relates to the technical field of iron ore mining, in particular to a method and device for reducing the mixing rate of small river side iron ore mining barren rock.The method comprises the steps that firstly, the mining sequence is changed into the direction perpendicular to an ore body from the previous direction along the ore body, namely, the ore body hanging wall advances to the ore body footwall; according to the method, the mining sequence is changed from the previous direction along the ore body to the direction perpendicular to the ore body, namely, the ore body hanging wall is propelled to the ore body footwall. The method comprises the following steps: respectively drilling holes in ores and waste rocks, blasting in sections, clearly mining and stripping without mixing, changing vertical drilling holes into inclined drilling holes in medium-length hole blasting, controlling the blasting height to be within 10m, controlling the hole diameter of each drilling hole to be phi 90, setting a chassis resistance line to be 2.25 m, setting a row spacing to be 1.8 m, setting a hole spacing to be 1.4 m, and effectively improving the quality of the ores after implementation. The waste throwing rate is reduced from original 35% to about 25%, large blocks in blasting operation are reduced, the secondary crushing amount is reduced, the production cost is reduced, and the mining benefit is improved.

Description

technical field [0001] The invention relates to the technical field of iron ore mining, in particular to a method and device for reducing the mixing rate of waste rocks in Xiaohebian iron ore mining. Background technique [0002] The ore required by the mining company is mainly produced in the Xiaoheside iron ore open-pit mining field, with an annual demand of about 750,000 tons. Now, with the decline of the mining platform, the ore body is gradually narrowing and the complexity is increasing. The ore is basically the original ore Mainly, the mining cost will increase accordingly, and the mixing of waste rocks in the ore will directly affect the ore grade, so the mixing rate of mining waste rocks will be reduced, the quality of ore will be improved, and the cost will be reduced (mainly freight and beneficiation costs), and the mining quality will be good. Iron ore has become extremely important. With the development of society, the application of iron ore has become more and...

AI Technical Summary

Problems solved by technology

[0003] The iron ore mining method currently used is to mine along the ore body. When mining along the ore body, ore and waste rock will be mixed together during drilling and blasting, resulting in a decline in the quality of the ore, resulting in a rejection rate of 35%. It causes a waste of resources. At the same time, the general drilling device has a single function and can only perform vertical drilling, which cannot meet the needs of drilling with different inclinations. method and device

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