The mines are harvested in stages or in sections, with horizontal or vertical stratification, and the ore that has fallen out is transported out of the mine roadway in the bottom column by its own weight. After the mining house is finished, the intermediate column, the top column and the bottom column of the upper stage are recovered by different methods, and the goaf is processed at the same time.
This method is applicable to the stable inclined and steeply inclined thick ore bodies of mining rocks. There are two schemes of section rock drilling and stage rock drilling when vertically layering ore.
Disadvantages: In the large amount of work, each section must dig a section of transport lanes, cutting lanes, rock drilling roadway. This mining method will become a widely used method with the further development and promotion of trackless equipment in China.
Advantages: Due to the segmented mining method, the segmented mining method can use high-efficiency trackless shipping equipment, which is flexible in application and high in mining intensity. At the same time, after the mining of the section mining, it is allowed to immediately return to the mining column and treat the goaf, which not only improves the ore recovery rate of the pillar, but also processes the goaf, and creates conditions for the next section of mining.
Knife Gate Valves are usually used for pulp/paper and mining industries.
Knife Gate Valves are named for its sharp, knife-like disc, which could
be used for cutting medium. The groove around the seat permits the gate
to push particles aside and prevents clogging. When the valve is open,
the flow cleans the groove. Seat is outside the flow area resulting in
higher flow coefficient with minimum pressure drop.
Kolink Knife Gate Valves are available in various designs, one-piece
body and two-piece bodies, rising Stem and non-rising stem,
uni-direction and bi-direction structures, resilient and metal seat
rings, bonnetless and bolted bonnet designs. For optional designs,
deflection cone could divert the flow of abrasive slurries and protect
valve seat from abrasion, V port disc and through conduit design are
used for throttling service, per customers' requirements.
Knife Gate Valve, Bi-directional Knife Gate Valve, Slide Gate Valve Supplier, Slurry Gate Valve Manufacturer
Wenzhou Kolink Valve Co., Ltd. , https://www.kolinkvalves.com