Influence of light burned magnesia powder on clinker agglomeration in cement industry

Clinker particles in the kiln are formed under the action of liquid phase (some materials are called melt), and the liquid phase forms capillary bridge outside the crystal. The liquid-phase capillary bridge plays two roles: one is to combine the particles together, the other is to act as an intermediate medium to make Cao and C2S diffuse in the molten state to form C3S. The strength of the particles depends on the strength of the capillary bridge. The strength of the bridge, that is, the force to connect the particles increases with the increase of the liquid-phase surface tension and the decrease of the particle diameter. The number of capillary bridges is inversely proportional to the square root of particle diameter. In order to form particles well, there must be enough liquid phase, and particles should be evenly distributed in the liquid phase to form a higher surface tension, a lower viscosity of the liquid phase, and a suitable time and temperature for particle formation.

Light burned magnesium is widely used in building materials, chemical industry, metallurgy, medicine and many other fields. It is an ideal material for the production of fireproof board, light partition board, magnesium sulfate, papermaking, sulfur removal process, furnace protection and slag splashing in steel plants. The surface tension of liquid phase is an important property of liquid phase, which has a direct relationship with agglomeration. The increase of surface tension of liquid phase is easy to agglomeration, 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 and s, have lower surface tension values, which is not conducive to the agglomeration; while mg, Al and other elements have higher surface tension values, which is conducive to the agglomeration.

Generally speaking, the viscosity value of liquid phase of clinker with different components is different. Generally speaking, the viscosity value of liquid phase is reduced. Light burning powder is conducive to the diffusion of Cao and C2S in the liquid phase to form C3S, which is also easy to form particles. The viscosity of liquid phase is related to temperature and decreases with the rise of temperature. The viscosity value of liquid phase in which several elements coexist is not the superposition of the viscosity value of single element.