The concept of wettability and its relationship to the floatability of minerals
Wettability refers to the affinity of mineral surfaces for water, also known as hydrophilicity and hydrophobicity. Wetting is one of the basic phenomena that occurs at the solid-liquid interface. In the flotation process, the mineral particles dispersed in the pulp can be selectively attached to the air bubbles, such as native gold, pyrite particles can be easily attached and floating along with the bubbles, and quartz, feldspar and other gangue minerals but It is difficult to adhere to bubbles and cannot float. Different minerals have different floatability, which is caused by the difference in wettability of the mineral surface to water.
Drop a drop onto a smooth quartz surface. As shown in the figure below, the water droplets quickly expand into a flat membrane. When the water droplets are dropped onto the natural gold surface, the water droplets do not expand to form a spherical shape. This shows that the quartz surface has strong wettability and can be wetted by water, which is a hydrophilic mineral. The natural gold surface has weak wettability and is not easily wet by water, and is a hydrophobic mineral.
In the flotation process, the hydrophilic mineral has a strong affinity with water molecules, and the water molecules can be closely aligned on the surface of the mineral and firmly adhere to the surface of the bubble to form a stable hydrated film. When the bubbles collide with the ore particles, it is difficult to discharge the water molecules in the film. Therefore, it is difficult for the ore particles to adhere to the bubbles, so that the hydrophilic minerals are difficult to float. On the contrary, the hydrophobic mineral surface has a weak affinity with water molecules, and the water molecules adhere to the surface of the ore particles very unstable, and cannot form a stable hydrated film. When the ore collides with the air bubbles, it is easy to discharge the water molecules, causing the hydration film on the surface of the ore particles to rupture, and even exposing the "dry surface" to achieve the adhesion of the ore particles to the bubbles. From this, it can be concluded that the hydrophobic mineral is easy to float.
Adjustable angle hydraulic notching machine
1.According to the shear plate thickness are automatically blade gap adjustable device
2.Machine ,electrical ,liquid franchising shear angle adjusting mechanism
Description
1.The thing that sets our corner notchers apart from other sheet metal equipment out there is our patented blade gap adjustment that allows the operator to cut different thickness without any adjustments needed by the operator. This allows our blades to last longer and gives us a nice burr free cut.
2.Our machines shear with the blades in the negative position as well as the positive position. Which one you use is based on which part you want to keep, the finished part pulled from the machine (best is Negative) or the dropped piece (best is Positive). Negative cut allows for less deformation on the finished part. Negative cutting clamps the sheet metal down so there isn't any movement. Positive cutting will want to move the sheet away from the stops allowing for room for error.
3.The stop guides have dove tail grooves in the tail that allows for a tighter more secure guide setting, allowing our machine more accuracy and repeatability.
Notching Machine, Hydraulic Notching Machine, Manual Notching Machine
JINAN EURO-ASIA MACHINERY CO., LTD , https://www.sdwindingmachine.com