Research progress on effect of grinding aids on grinding and application
Grinding is a high-energy-consuming,and it's energy consumption accounts for 30％ to 70％ of the total energy consumption of mineral processing,therefore,reducing the energy consumption in the grinding process and improving the grinding efficiency are the key to increase the efficiency of mineral processing,and adding grinding aids is one of the effective means to solve the problem. Factors such as medium filling rate,grinding concentration,pulp viscosity and ore will affect grinding efficiency. Energy consumption can be used to evaluate grinding efficiency. The grinding process is divided into two stages. In the first stage,grinding efficiency is high but falling fast,and the number of cracks on the ore particles is gradually reduced. In the second stage,the grinding efficiency is stable but low,and the smaller the the particle size,the fewer suface lattice defects,the more difficult to grind and strip. The grinding aid is adsorbed on the surface of mineral particles through physical and chemical interaction,that is,physical adsorption occurs through electrostatic force,and chemical adsorption occurs through the formation of hydrogen bonds and coordination bonds between grinding aid molecules and the surface of ore particles,which affects the surface properties of mineral particles to change the pulp viscosity and affects the grinding kinetic parameters. During the adsorption of grinding aid,the surface of mineral particles is similar to the presence of lubricating medium,which makes it easy to slip between structural layers,thus reducing the "agglomeration" of particles in the grinding process,increasing the dispersion of particles,and reducing the surface free energy,improving the rheological properties of the pulp,and shortening the grinding operation time which can achieve the appropriate mineral particle size,and thus significantly improve the grinding efficiency,reduce energy consumption and steel ball consumption and reduce the production cost. In the paper,the latest research results about the influence of grinding aids on grinding at home and abroad were reviewed,the principles of grinding aids of different kinds were summarized,the mechanism of grinding aids on grinding efficiency were compared and analyzed,and the characteristics of grinding aids on grinding dynamics were discussed,which can provide reference for the subsequent use of grinding aids in grinding.
grinding aidgrinding kineticsmechanism of actiongrinding efficiency
万方数据
维普
