Clinker particles in the kiln are formed under the action of liquid phase (some data call melt), and the liquid phase forms capillary bridge outside the crystal. Light burned magnesium powder The liquid phase capillary bridge plays two roles: one is to bind the particles together, the other is to act as an intermediate medium to make CaO and C2S diffuse in the molten state to generate C3S. The strength of the particles depends on the strength of the capillary bridge. The strength of the bridge, that is, the force connecting the particles increases with the increase of the liquid phase surface tension and the decrease of the particle diameter. The number of capillary bridges in light calcined powder is inversely proportional to the square root of particle diameter. For good granulation, there must be enough liquid phase, and the particles must be evenly distributed in the liquid phase to form high surface tension, low liquid viscosity, suitable granulation time and temperature, etc.
Light burned magnesium is widely used in building materials, chemical industry, metallurgy, medicine and other fields. It is an ideal material for the production of fireproof boards, light partition boards, magnesium sulfate, paper making, sulfur removal process, and slag splashing in steel plant furnace protection. The surface tension of liquid phase is an important property of liquid phase, which has a direct relationship with granulation. The increase of the surface tension of liquid phase is easy to granulation, and the size of clinker particles has a good linear relationship with the surface tension of liquid phase.
The surface tension of the liquid phase is related to the electronegativity of the outer electrons of the elements. Some elements, such as K, Cl, S, have low surface tension values, which is not conducive to granulation; The surface tension of Mg, Al and other elements is higher, which is conducive to granulation.
The liquid viscosity values of clinker with different components are different. Generally speaking, the liquid viscosity value decreases. Light calcined powder is conducive to the diffusion of CaO and C2S in the liquid phase to generate C3S, which is also easy to granulate. The liquid viscosity is related to temperature and decreases with the increase of temperature. The liquid viscosity values of several elements coexistence are not the superposition of liquid viscosity values of single element.
