3results about How to "Small block" patented technology

A high-efficiency tunneling method for straight-line slotting of empty holes in large-section tunnels comprises the following steps: firstly determining the surrounding rock grade and blasting excavation footage, and determining the blasting cycle footage according to the surrounding rock grade and referring to the design specification; calculating various blasting parameters, and calculating various blasting parameters according to the types of blasting equipment, explosive parameters, rock parameters, tunnel excavation cross-sectional area, and cycle footage; preparing blasting design, and making good blasting technical and safety disclosures; completing drilling of different types of blastholes at various locations; organizing personnel to clean and inspect different types of blastholes at various locations; charging and filling, and detonating, completing charging and filling of different types of blastholes at various locations, laying out in-hole detonating caps and outside-hole connecting detonators according to the blasting parameter table, and detonating according to the blasting process; ventilating and discharging, and then measuring the tunnel blasting cycle footage and over-excavation and under-excavation, and adjusting the next cycle blasting plan according to the current blasting effect and surrounding rock conditions.

The invention discloses a double-alloy sintered neodymium-iron-boron permanent magnet and a preparation method and application thereof, and relates to the technical field of rare earth permanent magnet materials. Comprising the following steps that a main alloy and an auxiliary alloy are evenly mixed and then subjected to orientation profiling, cold isostatic pressing, liquid phase sintering and tempering heat treatment in sequence, the double-alloy neodymium iron boron permanent magnet is prepared, the chemical composition of the auxiliary alloy is AlxRE2yM100-x-y, RE2 is selected from one or more combinations of Ce, Dy, Gd, Ho, La, Nd, Pr, Tb and Y, and M is selected from any one or more combinations of Co, Cu, Ga, Ti, Zr and Nb; x and y satisfy 5 < = x < = 50 and 20 < = y < = 80; according to the method, on the premise that the magnetic performance of the neodymium iron boron permanent magnet is synchronously optimized, the mechanical performance of the neodymium iron boron permanent magnet is further improved, the mechanical performance and the magnetic performance of the sintered magnet have good consistency and stability, the technological method is simple and easy to implement, and the method is suitable for industrial production.

The application discloses a kind of gentle inclined thin and medium thick ore body stope inter-column recovery methods, comprising the following steps: S1, determine recovery unit and mining sequence;S2, mining engineering arrangement;S3, recovery unit advance pressure relief and pre-splitting;S4, mechanized continuous recovery, transportation and support;S5, after constructing filling retaining wall in the bottom of recovery unit, subsequent filling is carried out, bagged gravel filling recovery unit and ore roadway corner is used, and the ore roadway is expanded and brushed to the next adjacent recovery unit to carry out ore body advance pre-splitting and pressure relief, to prepare for the recovery of the next recovery unit;The method requires simple equipment, easy to operate, safe, efficient and economical, low ore loss and dilution, and can safely and effectively control the stability of stope surrounding rock and the occurrence of rock dynamic disaster during mining, and has broad application prospect.