5results about How to "Reduce depletion rate" patented technology

The application discloses an ore grade analysis method and device based on forward calibration of a truck scanning station, and the method comprises the following steps: sampling standard material and determining the grade of the sample, dividing the standard material into multiple ton bags, obtaining the counting rate of the ton bags by using the truck scanning station, obtaining the first calibration coefficient and the second calibration coefficient by using the least square method fitting according to the grade of the sample and the counting rate of the ton bags, obtaining the counting rate of the to-be-measured ore by using the truck scanning station, selecting the first calibration coefficient to calculate the first grade of the to-be-measured ore, comparing the first grade of the to-be-measured ore with the grade of the inflection point, if the first grade is less than the grade of the inflection point, then the first grade is taken as the final grade, otherwise, the second calibration coefficient is selected to calculate the second grade of the to-be-measured ore, and the second grade is taken as the final grade. By using different calibration coefficients in different grade intervals, local errors are effectively reduced, and the accuracy of measurement of the scanning station in the low-grade interval is improved.

This invention belongs to the field of mining engineering technology, specifically disclosing a method for subsequent backfilling of a goaf in a gently dipping thick ore body. The backfilling method involves dividing the ore body vertically into multiple intermediate sections, each intermediate section into multiple segments along the strike, each segment into multiple ore block units along the dip, and each ore block unit into multiple stopes. Segmental vein roadways are arranged along the strike of the floor, and ore extraction ramps are arranged along the dip from these segmental vein roadways. Roof-cutting vein roadways are arranged along the strike of the roof, and roof-cutting ramps are arranged along the dip from these roof-cutting vein roadways. An ore extraction access road is constructed along the strike from the ore extraction ramps, and a drilling roadway is constructed along the strike from the roof-cutting ramps. Downward drilling is used in the drilling roadways to create blast holes and blast the ore, which is then extracted through the ore extraction access road. After mining is completed, a goaf is formed. Backfilling pipelines are laid through the roof-cutting vein roadways, roof-cutting ramps, and drilling roadways to the goaf before backfilling. This invention features reduced mineralization, high efficiency in mining, low cost, and high safety in stope mining.

This invention relates to the field of mining methods, specifically to a bottomless, segmented parallel ore-draining method. The method comprises the following steps: S1. After the collapse of the access road of a first drilling roadway, the width of the collapsed section along the strike of the ore body is determined as L2. Multiple second drilling roadways are designed along the direction perpendicular to the strike of the ore body. The access distance M between adjacent second drilling roadways is determined based on the access distance m between adjacent first drilling roadways; S2. The number n of second drilling roadways is calculated based on the ore body access length L between the vein roadway and the cutting roadway, the width L1 of the collapsed section, the width L2 of the collapsed section, and the access distance M between adjacent second drilling roadways; S3. Based on the number n of second drilling roadways and the access distance M between adjacent second drilling roadways, second drilling roadways are deployed between the vein roadway and the cutting roadway for ore body recovery. This ore-draining method is applied to ore recovery after the collapse of a drilling roadway access roadway, significantly improving ore recovery efficiency and reducing dilution rate.

The invention discloses a mining method for grade-divided pseudo-inclined mining, separation, separate filling and gently inclined medium-thick phosphorite, and relates to the technical field of underground mining of non-metal ores, the mining method comprises the following steps: dividing an ore body, and arranging along the trend of the ore body in a segmented and middle-section manner; mining preparation cutting is conducted, a middle-section haulage roadway, an air return roadway and a connection roadway are arranged, tunneling cutting is conducted to go uphill, and crushing and sorting equipment is integrated; pseudo-inclined grade-divided layered stoping is carried out, differential ore breaking is carried out through horizontal shallow holes in the upper layer and fan-shaped medium-length holes in the lower middle portion, and combined supporting is matched; partitioning and grading filling, retaining wall and water filtering system building, tailing reuse bottoming, and strip chamber and pillar differential lime-sand ratio filling; and finally, fully mining and fully filling the chambers and the pillars in sequence. The mining method provided by the invention can improve the ore resource recovery rate of gently inclined phosphorite, reduce the dilution rate, improve the mining efficiency, enhance the safety, reduce the production cost, promote environmental protection and the like, and has important significance for efficient, safe and environment-friendly mining of gently inclined phosphorite resources in China.

The invention relates to a bionic filling mining method for an underground metal mine. The method comprises the following steps: stoping in sections in a stope; a bionic honeycomb air bag support; carrying out gradient microorganism consolidation filling; multi-source data fusion monitoring regulation and control; and subsection filling is conducted on the secondary mining section. Firstly, a bionic hexagonal honeycomb air bag and nanometer tear-resistant coating supporting structure is adopted, a pressure-displacement dual-mode sensor is combined, supporting of the goaf is rapidly and accurately completed, and it is ensured that the supporting compressive strength meets the long-term stability requirement under the deep high-stress and strong blasting impact environment. Then the modified tailing cementing slurry, a Thermus sp gradient bacterial agent and a nano calcium carbonate crystal nucleus are synergistically mineralized, so that the mineralization time is greatly shortened, and the recovery efficiency is improved; the filling body forms a matched surrounding rock stress arch with a hard bottom and a soft top through a process of adding the microbial agent in a gradient decreasing manner from bottom to top and a layered pouring process, so that the phenomena of bottom crushing and top void are eliminated.