Ultrafine powder dispersion technology is a crucial step in many industries, including mining, pharmaceuticals, and ceramics. The dispersion of ultrafine powder is necessary for ensuring a high-quality product, and there are various methods available for achieving this.
Dry dispersion is the most common and straightforward method of ultrafine powder dispersion. It involves eliminating or preventing the formation of liquid bridges, which can cause powder agglomeration. Mechanical dispersion is the process of using mechanical force to break up powder agglomerates, and it is currently the most widely used method.
Surface modification is another effective method for improving ultrafine powder dispersion. It involves changing the physical and chemical properties of the powder surface to improve its dispersion. Electrostatic dispersion is the use of homogeneous particles with the same surface charge to achieve ultrafine powder dispersion. The most effective particle charging method is corona charging.
Material crushing is an essential process that involves extrusion, impact, grinding, and splitting, among other methods. The corresponding crushing methods are extrusion crushing, impact crushing, friction shear crushing, and extrusion shear crushing. Common equipment for extrusion crushing includes extrusion mills and jaw crushers, while commonly used equipment for extrusion, shear, and crushing includes Raymond mills and ultrafine vertical mill. Impact crushing common equipment includes impact crushers and airflow crushers, while commonly used equipment for friction shear crushing includes vibration mills, stirring mills, and ball mills.
Grinding aids are chemical additives added during the ore grinding process to improve grinding efficiency, reduce energy consumption and steel consumption. They can be divided into compounds and mixtures based on their composition. Compounds can be further divided into polar and non-polar grinding aids. Polar grinding aids are ionic and include triethanolamine, ammonium acetate, ethylene glycol, propylene glycol, sunflower acid, and naphthenic acid, while non-polar grinding aids are non-ionic and include coal, graphite, coke, pineol, and gypsum. Mixtures refer to a compound grinding aid, including organic matter, organic and inorganic matter mixtures, and inorganic matter mixtures.
The addition of grinding aids changes the grinding environment, which can have a significant impact on the surface properties and solution chemistry of minerals. It also facilitates powder dispersion, which is essential in the non-metallic mineral crushing process. The addition of grinding aids has the characteristics of improving the grindability of materials and preventing fine particle bonding and agglomeration. The commonly used grinding aids include alkaline polymeric inorganic salts, alkaline polymerized organic salts, and dipolar-dipole organic compounds.
In conclusion, ultrafine powder dispersion technology and grinding aids play a crucial role in various industries. It is essential to understand the different methods and additives available to achieve the desired dispersion and improve the quality of the final product.