Qijiaojing ferrovanadium ore occurs in the top area of iron ore body Qingbaikouan large excluded downhill group, with ledge things 4.3km long, thick as 10 30m, 67m thickness most, ~ thick intermediate thin seam ends, the average The true thickness is 18.22m, and the ore body inclination is 28°~60°. Ore metal component is relatively simple as a single deposit of iron, total iron (of TFe) grade is generally 30% to 35%, an average of 30.45%. The average density of ore is 3.49t/m3, the average density of rock is 2.9t/m3; the hardness coefficient f of ore is 10~12, the hardness coefficient f of rock is 8~10, the overall stability of rock is strong, local and ore The rock at the rock boundary line is layered slate with poor stability; the loose rock coefficient of rock is 1.5; the compressive strength of rock is 93.74~185.39MPa. The hydrogeological conditions in the mining area are relatively simple, and the water content in the ore is extremely small. 3 parameter optimization The YGZ-90 drilling rig is used in the deep hole drilling of the Qijiaojiao vanadium iron ore, including the medium-deep hole forming the cutting groove and the fan-shaped medium-deep hole of the mining blasting. Since the cross-section of the rock and cutting roadway is 3.2m×3.0m, it provides a free working space for the drilling machine, so the medium-deep hole design can be optimized according to the free working space. The medium and deep hole is designed with a movement of 1.2m from the bottom plate and a side hole angle of 15°. The original design has a minimum resistance line of 1.4 to 1.5m and a hole bottom distance of 1.8m. Due to the design and construction of the scheme, the medium-deep hole blasting effect is not satisfactory. The high block rate increases the risk factor and cost of the subsequent secondary blasting, increases the difficulty of mining, and has a greater impact on the mining production. In order to ensure safe and efficient production operations, the middle and deep holes of the mine are optimized and adjusted: the minimum resistance line is adjusted to 1.2m, the hole bottom distance is adjusted to 2~2.2m (arranged alternately), and the edge angle remains unchanged. change. After optimization by the differential blasting technology with large hole bottom distance and small resistance line, the blasting ore volume is large, the empty area is smooth, the blasting quality is improved, the ore crushing block is small after the explosion, and the shovel is convenient, saving two. The cost of the secondary blasting can effectively meet the production demand, the production efficiency has been greatly improved, and the overall cost has decreased. AN ALTERNATOR IS AN ELECTRICAL GENERATOR THAT CONVERTS MECHANICAL ENERGY TO ELECTRICAL ENERGY IN THE FORM OF ALTERNATING CURRENT. FOR REASONS OF COST AND SIMPLICITY, MOST ALTERNATORS USE A ROTATING MAGNETIC FIELD WITH A STATIONARY ARMATURE. OCCASIONALLY, A LINEAR ALTERNATOR OR A ROTATING ARMATURE WITH A STATIONARY MAGNETIC FIELD IS USED. IN PRINCIPLE, ANY AC ELECTRICAL GENERATOR CAN BE CALLED AN ALTERNATOR, BUT USUALLY THE TERM REFERS TO SMALL ROTATING MACHINES DRIVEN BY AUTOMOTIVE AND OTHER INTERNAL COMBUSTION ENGINES. AN ALTERNATOR THAT USES A PERMANENT MAGNET FOR ITS MAGNETIC FIELD IS CALLED A MAGNETO. ALTERNATORS IN POWER STATIONS DRIVEN BY STEAM TURBINES ARE CALLED TURBO-ALTERNATORS. LARGE 50 OR 60 HZ THREE PHASE ALTERNATORS IN POWER PLANTS GENERATE MOST OF THE WORLD'S ELECTRIC POWER, WHICH IS DISTRIBUTED BY ELECTRIC POWER GRIDS.[ Bosch Alternator,Denso Alternator,Ford Alternator,Hitachi Alternator Ningbo zhongwang auto fittings co.,ltd , https://www.zowoparts.com
1 mining structure parameters and main mining and cutting projects
The seven-corner vanadium iron ore segmental empty-field mining method is arranged along the ore body direction. The ore body is divided into a ore block according to the length of the ore body. The ore body is 42m, the column is 8m, and the width is the thickness of the ore body. The middle section is 65m high and is divided into 4 sections. The segment height is about 16m on average (Fig. 1). The top and bottom columns are not left in the nuggets. The mining and cutting project has a sectioned extra-vehicle transport roadway with a section size of 4.3m (width) × 3.5m (height), B/3 three-heart arch, and the roadway specification of shotcrete support is 4.4m (width) × 3.55 m (high), B/3 three-heart arch; section rock drilling roadway, mining road, cutting lane, the section specifications are 3.2m (width) × 3.0m (height), B / 4 three-heart arch, etc. . The cutting well is arranged in the cutting lane. The specific design position is based on the actual exposure of the ore body. The section specification is 2.0m (width) × 2.0m (height). The segmented extra-vehicle transportation roadway is arranged outside the vein, and the sub-cavity roadway is drilled into the ore body through the auxiliary roadway. 
2 mining equipment construction equipment and materials
The rock drilling equipment used in the roadway excavation and cutting well construction is the YT28 rock drill . The YT28 rock drill is suitable for drilling horizontal, inclined and vertical blastholes on medium hard or hard (f=8~18) rocks. The diameter is generally 34 ~ 42mm, effective, economic drilling depth of up to 5m. The medium-deep hole rock drilling construction of each section back to the mining room adopts YGZ-90 drilling rig , disc rotation and sled type bracket. The drill bit is an octagonal cone drill with a diameter of 55mm. The diameter of the drill is 65mm and the length of the drill pipe is 1.1m. . Each back mining room uses XYWJ-3.5L type scraper to mine in each section back to the mining room. The scraper shovel the ore from the bottom of the mine and pours it into a 15t dump truck, which is transported by 15t dump truck to each The ore is discharged from the mine. The by-product mines and meteorites from the heading face are shipped from the XYWJ-3.5L scraper to the 15t dump truck, which is transported by truck. The medium-deep hole blasting adopts the powdered ammonium explosive as the main explosive, and the primer is made of 32mm medicine roll and non-conducting blast tube. When blasting, the double-type detonation method is adopted (the cutting groove is installed with detonating cord). Arrange the blastholes to be detonated in the non-conducting squib hole, the splicing in the row, and the difference between the rows (the millisecond detonating tube in the row is slightly different - the blasting in the row is detonated), and the medium and deep hole charge is BQF- 100 charger charge.
Mining and blasting blasting adopts 2# rock emulsion explosive, plastic detonating tube detonation network, detonating tube must be connected reliably, detonating tube detonator is detonating detonating tube, plastic detonating tube type is 8# detonator, non-electrical detonation The tube is divided into a detonating tube detonator and a detonating tube detonator. The length of the detonating tube is 5,6 m, and the detonation speed is (1950±50) m/s.
3.1 Optimization of cutting and cutting roadway layout
According to the design principle of side-by-side exploration and excavation, the construction of the rock-in-rock tunnel ahead of the length of a mine in the roadway outside the vein, and the prospecting of the rock-filled roadway to the cutting trough is immediately carried out to explore the upper and lower plates of the ore body. After the mining industry, the tunnel can be designed and constructed. In order to ensure the safety of the roadway outside the pulse, the vertical distance from the lower part of the ore body is adjusted from 20m to 15m, which can achieve the purpose of safe passage while reducing construction cost. Taking the ore body (level thickness 28m) with an inclination angle of 45° and a vertical thickness of 20m as an example, the rational arrangement of the rock in the vein becomes the key to safe and efficient construction of the deep hole due to the gentle inclination of the ore body. After the design of the intra-pulse rock tunnel is optimized, the center of the roadway is arranged from the middle of the original horizontal thickness (ie 14m position) to the horizontal thickness of the ore body of 7m (from the lower plate) (Fig. 2). After optimizing the design of the intra-pulmonary rock tunnel, the problems of large resistance, high safety hazard and high material consumption caused by the long holes in the medium-deep hole construction are reduced, which provides conditions for safe and efficient production.
3.2 Medium and deep hole design optimization
3.2.1 Cutting groove design optimization
The design of the medium-deep hole cutting groove is 1.1m, of which the first row is 0.8m from the cutting well, and the movement is 1.2m according to the bottom plate. If the top plate is transparent with the upper layer, leave a protective layer of 0.5m to prevent the perforation from bringing the charge. Inconvenience. The deep hole movement in the cutting groove is adjusted from the original 6 movement 6 holes to 3 movements 4 holes, and then the compartment is optimally adjusted to 3 movements 3 holes. According to the 3.2m (width) × 3.0m (height) 1/4B three-heart arch of the section of the cutting roadway, adjust the position of the movement, keep the height of the movement from the bottom of the floor (still 1.2m), the transverse direction of the movement and the center of the roadway The distance between the two movements, which is offset from the center of the original roadway to both sides by 0.5m, is adjusted to shift the center of the roadway to one side by 0.4m as the movement 2; on this basis, the displacement to the side is 0.7m. Core one; offset from the center of the roadway to the other side by 0.7m as the movement three, two holes in the movement, and one hole in the movement two and the movement three. The optimization of the partition is adjusted to be 1.1m from the center of the roadway to the side as the movement one; the center position of the roadway is used as the movement two; and the movement from the center of the roadway to the other side is 0.7m as the movement three. Practice shows that the optimized medium-deep hole design and construction footage is significantly reduced, which reduces material consumption.
3.2.2 Positive row design optimization
4 Conclusion
Optimization of the cutting design and optimization of the medium and deep hole design are essential for optimizing the mine operation process. The mining design and medium-deep hole design parameters of the Qijiaojiao vanadium ore mine in Subei are optimized and adjusted, and have achieved certain results. They have certain reference value for similar mines.
references
[1] Wang Shiming. Application of sublevel stoping field method LANGYA copper ore recovery of [J] interval. Modern Mining, 2013 (1): 86-88.
[2] Cai Zeshan. Application of medium-deep hole segmentation empty field method in Saishang copper mine [J]. Modern Mining, 2011 (3): 11-13
Article source: "Modern Mining", 2017.3
Author: Order east of cattle; gold credit Mining Management Ltd. All Rights Reserved: