Phosphorus ore underground mining method

Abstract

The invention relates to an underground mining method of phosphorus ore deposits of lower Cambrian series occurrence nearby Yunnan Dianchi Lake region, and aims to provide a special phosphorus ore underground mining method of the Yunnan Dianchi Lake region occurrence having the characteristics of inclination, thinness to medium thickness, top board fragmentation and soft interlayer containing in order to ensure the safe and efficient development and utilization of deep ore resources in the region and national similar condition ore regions. The method comprises the following steps: tunneling an inclined shaft, tunneling intermediate section large lanes along the direction of the ore, dividing the ore into two ore layers, respectively backstopping, controlling the thickness of an interlayer between the two ore layers to be 4-6m, mining the upper ore layer, and then backstopping the lower ore layer after rocks at the top board of the upper ore layer are broken and stable. The upper developable ore layer (with the average thickness of 8.9m) is mined in a segment shrinkage-breaking technology; and the lower developable ore layer (with the average thickness of 4m) can be mined in a shallow hole shrinkage mining technology, and the end span of the upper and lower ore layers at the mining moment is not less than 150m. The method is suitable for phosphorus ore deposits simultaneously having an inclination angle of 36-52DEG C, a thickness of 3-12m, a top board hardness coefficient of 0.8-2 and a thickness of the contained phosphorus ore deposit of 4-6m.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to an underground mining method for phosphate rock. Background technique [0002] Phosphate rock is an important strategic resource of the country, and it is one of the 20 minerals listed by the Ministry of Land and Resources that cannot meet the needs of national economic development after 2010. It is widely used in my country's grain production, modern chemical industry, new energy, new materials and national defense. At present, in the development and utilization of phosphorus resources, phosphate ore mining is faced with complex geological conditions, that is, the mining of phosphate ore bodies with gentle inclines, slopes, thin to medium thickness, broken roofs, and soft interlayers. The typical characteristics of large changes, unclear boundaries of ore and rock, and difficult support. This ore body output characteristic brings a series of technical dif...

AI Technical Summary

Problems solved by technology

Chinese patent 85103513 "Segmented Caving Mining Method with Continuous Retreat along the Trend" has the characteristics of simple process and easy to master, but there are problems such as imperfect mining process, poor safety (direct roof is easy to fall), dilution rate and loss rate Big disadvantages (loss rate 41.12%, dilution rate 12.04%); Chinese patent 03136109.3 "Anchor Roof Protection Segmented Open Field Method for Phosphate Mining" has perfect mining technology, high safety, low dilution rate and loss rate advantages, but its mining process is complicated, the support cost is high, and its promotion and application range is limited

The above two mining methods have no technical support conditions for direct application to the underground mining of phosphate rock with the four characteristics of slope / thin to medium thickness / broken roof / soft interlayer / at the same time

[0005] 2. Zhang Yisheng, a senior engineer from the Changsha Design and Research Institute of Chemical Industry, conducted research on the mining methods of the medium-thick and gently inclined phosphate ore bodies in the three mining areas of Jinhe Phosphate Mine in Sichuan, Jingxiang Phosphate Mine in Hubei and Kaiyang Phosphate Mine in Guizhou [Zhang Yisheng. Development of Underground Mining Methods for Medium-thick and Gently Inclined Phosphate Rock in China[J]. Thick / inclined / broken refractory phosphate ore body filling mining method was studied [Peng Kang. Research and application of medium-thick inclined and broken phosphate ore body mining method [D]. Changsha: Central South University, 2011], Tian Weijun and Tang of Chongqing University Master Qiang conducted a research on the caving mining of gently inclined and inclined medium-thick phosphate ore bodies in the mining area of ​​Yunnan Phosphate Group [ [Tian Weijun. Mining pressure appearance in the underground mining stope of gently inclined medium-thick phosphorus ore deposits and the deformation and failure laws of overlying rocks[ D]. Chongqing: Chongqing University, 2010], [Tang Qiang. Appearance of mine pressure in the mining stope of inclined medium-thick phosphate deposit by caving method and the law of deformation and failure of overlying strata [D]. Chongqing: Chongqing University, 2011] ], above Scholars have conducted research on various mining methods such as caving method, chassis funnel mining method, room-and-pillar method, filling method, etc. Underground mining of phosphate rock under different conditions has important engineering guiding significance, but none of the above-mentioned related studies involved the research on the mining methods of phosphate rock with four characteristics: inclined / thin to medium thick / broken roof / containing soft interlayers at the same time

Images