Ling Yuquan Iron Sublevel caving mining method pa

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Ling Yuquan Iron Sublevel caving mining method parameters

# 215; 0.6-3.4 where B - into the road width, m; b --- equipment, maximum width, 2.2mIbz-- security clearance. 0.6m. Second, the loss from reduced ore dilution indicators considered, the greater the width of the roadway as possible, the roadway is wide. Conducive to the flow of ore. Can reduce the ore block, easy to install mine. Ore into the road width must be greater than mouth width, as shown in Figure 3. Prince Yu 3B ≥ b ≥ 2 (h-hm) c. c at + b3 (6) ≥ 2 (3-I.d) Cot55. +2 = D. 2hm - the fan-shaped center hole high, 1.1m; B - side hole fan angle. 55. ; Ba - in parallel with the width of the hole, 2m. Ore ore port width b is the ellipsoid shape was required movement of release. This width is equal to or greater than the width of the mining approach, if not necessarily the right wider. Ling Yuquan iron approach now used width is 4m, proven to be appropriate. Fourth, approach spacing interval approach between the two approaches is the center distance. It is equal to the width of the approach roads with the width between the columns. Determine the spacing of the principle of approach is followed so that the diamond mine repeatedly caving ellipsoid contours with the release of as much as possible consistent with the principles identified. When caving mine more ore powder, wet, poor mobility, the roadway center distance smaller is appropriate, but playing attention to maintaining the stability of roadway itself (put a gun in front of, behind the roadway to remain deformed.) L = B + m (7) an d +3.7-7.7 where L - distance approach, B - into the road width, m - between the column thickness, m. :: Was !:±:!: insect uP-S (Wz ・ H +0.67 hu ・ Wu) = 3.7 where S - factor of safety, take 2 ~ 3IWr - mineral density, 8.8t / m . ; Wu - coverage of repeated physical density, 2.7t / m. } H - segment height, lOre; P - ore strength, 7.8MPa (800t / m) 'hu - cover thickness. 50m. In order to adapt the movement of ore ellipsoid law, no pillar mining method into the way the upper and lower arranged diamond mining, mineral ore from the upper mouth of the body similar to prolate spheroid Box 8 does mine \i am out of the secret. It is often said that the release of Yuan ellipsoid. Ore {- release, its space is due to the surrounding minerals and rocks. times the size of loose produce is filled with too much inflation. From the perspective of ore When the cut-off ore, the ideal approach should be the distance between the release of two adjacent ellipsoid approach tangent, the high recovery rate of ore. L-1 A e: 9 - (b a 0,4 ・ H0l-e }) (8) = 20 ~ / 1 I (0.95) 0 ten (3,6-0.4 x20 ~) = 7.34 where H mouth - Ore height, 20Ie --- like horizontal ellipsoid eccentricity, 0.95} b - ore port width, 3.6m. Yuquan sinica iron ore in the past, into the road space used l0m, Pat-through practice to 8m, better. V. mining step down - a reasonable choice caving step is to reduce the dilution of ore loss of one of the important parameters. caving step is too small, waste rock mixed with Tsui early, had too high then mineral loss. caving step should be sub- from the roadway center height and adapt, that is, the breakout of the seam line with the release of appropriate ellipsoid. a reasonable step down as style mine: R for a ride (9) K (19-17-16ej) = 1211. +, / T say nothing of research where R - step off the mine, me - pardon mine seems shorter ellipsoid auxiliary angle, 5l - things like ellipsoid vertical eccentricity, 0.96} e --- like ellipsoid horizontal eccentricity, 0.95lx-- squeeze the loose blasting coefficient, 1.2 ~ 1.251. Yuquan Ridge Iron Ore drop step, using a row of one step, small step 1.8. From practical view, the target rate of ore dilution, or loss of the ideal. Liaoning Province, Kazuo iron ore direct reduction of iron works building in Chaoyang City, Liaoning Province for the full use of long Kazuo Xian Tan mineral resources development of local industry. The multi-well before and after the shake out of the Advisory three batches of steel workers strike ● money the company spent 410 branch plant (Sichuan Lu Chang City) site visits and conduct experimental research on tough step, but also by the provincial, city and county levels of repeated discussions about guidance research capsule, the central rotation set construction DRI kiln wide. Velvet former province of dollars, has been formally approved by the silkworm column Xu, and immediately begin the design and construction preparation work. To maintain the smooth {Chih-engineering. reliable for, Kazuo signed iron ore and 410 plants Pier D expressions of interest and technical service providers commandment of the minutes of the works. the 410 technical Liang plant as their care, the 410 plants proposed and agreed that the long-copy Black Box Mine Design Institute of Metallurgical undertake the design, the current design and related preparatory work is to Pi Chang accelerate progress. (leaf Kuang Wu)
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