Why do different minerals have different surface wettability, some have strong hydrophilicity and some have weak hydrophilicity, so that there is such a big difference in their floatability? This is because the hydrophilicity of the mineral surface is determined first by the physicochemical properties of the mineral surface, and its physicochemical properties are determined by the lattice structure of the chemical composition of the mineral itself.
Any mineral is composed of ions, atoms, and molecules. When the particles of different elements form the mineral crystal, they can be in the ionic state, the atomic state, and the molecular state. The states are different, and the bonding forces formed by the different elements are different. When the mineral with the ionic lattice and the covalent lattice is broken and ground, the residual bond force exposed on the fracture surface is stronger. When the bond strength is strong, the affinity for water molecules is large, and the mineral is relatively difficult to float. When the mineral and having a molecular lattice of broken metal lattice, the residual bond strength fracture surface exposed relatively weak bond is weak affinity for water molecules is small, and therefore, the mineral is more buoyant.
The order of floatability of minerals in water
Floatability order | Mineral name | Crystal structure |
Big | Naphthalene, paraffin, iodine , sulfur | Molecular crystal |
in | Graphite , molybdenum ore | The lamellar lattice and fracture surface are dominated by molecules |
small | Natural gold  Pyrite, galena fluorite Calcite Mica Feldspar , quartz | Metal lattice  Semi-metal lattice   Simple ion lattice   Complex ion lattice   Layered ion lattice Covalent lattice |
The table above lists the natural floatability sequence and lattice structure of some minerals in water. It can be seen that the minerals with large natural buoyancy are minerals that are not common in the flotation, and the common minerals are naturally less buoyant and need to be treated by flotation treatment to float. Therefore, from a practical point of view, the floatability of minerals should take into account various factors. For example, natural gold and heavy metal sulfides are minerals that are less buoyant in the table. Therefore, in order to improve the floatability of minerals, it is necessary to change the properties of the mineral surface so that the minerals can be selectively attached when they are in contact with the bubbles. For non-hydrophilic minerals, conditions must also be created to allow the mineral to be wetted by water.
Grinder is an important part in the whole grinding system. Its specialty is not that obvious, but it is the direct contact to the workpiece. Our Force Control System, active contact flange, or Constant Force Actuator is intalled in the middle of robot hand and grinder, which can control the force magnitude flexibly. It can optimize the grinding effect and improve the grinding efficiency a lot.
industrial electric grinder,industrial pneumatic grinder,industrial disc grinder,industrial square grinder
DARU Technology (Suzhou) Co., Ltd. , https://www.yiwufizz.com