2. For extremely thick ore bodies with a thickness greater than 50m, the sectioned alluvial can be opened in the center of the ore body, or the mining area can be divided along the strike, and the ore blocks can be divided in the mining area;
3. The main technical parameters of the recovery should be determined by mining method tests. When the experimental research parameters are not obtained, the height of the section may be 10m~15m, the spacing of the approach may be 10m~20m, the step of the collapse shall not exceed 3m, and the inclination of the edge of the fan hole may be 60°~70°;
4. Above the mining face, there should be a cover rock layer larger than the section height; if the amount of rock that cannot be self-propelled or falling on the upper plate does not reach the specified thickness, it should be forcedly topped in time and should be covered. The thickness of the rock formation is about twice the height of the section;
5. When the ore is not stable enough, effective measures should be taken to prevent deformation and blockage of the blasthole and damage to the top eyebrow line at the end of the approach;
6. The adjacent working face of the same section shall be formed in a stepped shape;
7. When the upper and lower sections are simultaneously harvested, the upper section shall be advanced to the lower section, and the advanced distance shall be such that the upper section is outside the range of the displacement of the lower section of the mining face, and shall not be less than 20 m;
8. After the section is completed, the slippery port of this section shall be closed in time.
PTA Powder
Main application:Repair and strengthen workpiece surface, significantly
Welding method:PTA welding
Main equipment:PTA welding machine
Flame core temperature: about 10000℃
Technological characteristics:PTA has high temperature, concentrated energy, stable combustion, small heat affected zone, fast welding speed, high production efficiency, easy to obtain low dilution rate of surfacing layer, surfacing layer and workpiece matrix are metallurgical bonding,, bonding strength is high.
PTA welding technology is one of surface strengthening methods, which has high deposition rate, low dilution rate, and could be applied with many kinds of powder. The manufacturing craft of PTA powder is normally gas atomization, which reduces satellite of powder. We supply 4 main categories of PTA powder: Nickel-based alloy powder, Iron-based alloy powder, Cobalt-based alloy powder and Mixed Powder.
Nickel Based Alloy Powder possesses high temperature resistance and wear resistance, it is the most popular alloy powder applied by PTA welding both domestically and internationally. Coating hardness is within the range of HRC 30-60. It could be applied to various industries like agriculture, plastic, paper, marine and steel making where wear and corrosion protection needed. Some examples are plunger, moulds, pump leaf and screw.
Iron Based Alloy Powder is more widely used and a more economic choice. With high abrasive resistance, it is more commonly applied to mining tools, drilling tools and mixers of iron and steel making industry, coal industry, shaft, oil and energy industry.
Cobalt Based Alloy Powder is recommended for corrosion and oxidation resistance, with better hot hardness values than equivalent Nickel based alloy powder. It is widely applied to steel making industry, coal industry and mining industry.
Mixed powder mainly refers to NiCrBSi mixing with other hard-phase powder such as cast tungsten carbide and other cemented alloy powder, which allows the powder better hardness around HRC60 and excellent abrasion resistance.
Mixed powder is more often used for mining equipment for oil sands, lignite, oil drilling tools, excavator buckets, extrusion screws for plastic processing, grain and oil processing, etc.
PTA Powder,Iron Based Alloy Powder,Cobalt Based Alloy Powder,Nickel Based Alloy Powder
Luoyang Golden Egret Geotools Co., Ltd , https://www.xtclasercladding.com