The high-frequency vibration trommel machine has high efficiency, small amplitude and high screening frequency. It is an effective equipment for screening and classifying fine-grained materials, and is widely used in screening or classifying operations of iron ore, tin, tungsten, tantalum, niobium sand and other concentrators. Screening efficiency and productivity are technical and economic indicators of the screening process, the former is a quality indicator, and the latter is a quantitative indicator. The factors that affect the screening process in normal production can be roughly divided into three categories, let's take a closer look below.
When the load of the sieve is large, the screening efficiency is low. To a large extent, the flat rate of the circular high-frequency vibrating sieve depends on the size of the sieve hole and the total screening efficiency; the larger the sieve hole, the lower the screening efficiency is required, and the higher the productivity. The inclination angle of the sieve should be suitable, which is generally determined through experiments.
Then there is the amplitude and frequency of the sieve of the high-frequency vibrating sieve, which is related to the structural properties of the sieve. Within a certain range, increasing the vibration can improve the screening index.
When the fine particle content of the material is large, the productivity of the sieve is also large. When the humidity of the material is high, generally speaking, the screening efficiency will decrease.
However, the larger the size of the sieve hole, the smaller the effect of moisture. Therefore, for wet materials with high moisture content, in order to improve the screening process, the method of enlarging the sieve hole or wet screening can generally be adopted. Materials with large mud content (when the mud content is greater than 8%) should adopt wet screening or pre-washing.
The high-frequency trommel screen separator makes the particles and the screen surface move vertically, so the screening efficiency is high and the production capacity is large. However, the relative movement between the particles and the screen surface is mainly a bar screen, a plane high-frequency vibrating screen, a drum screen, etc., which move in parallel, and their screening efficiency and production capacity are low.
Note: For a certain material, the productivity and screening efficiency of the sieve are determined by the size of the sieve hole. The productivity depends on the width of the screen surface, and the productivity of the screen surface is high. The screening efficiency depends on the length of the screen surface, and the screening efficiency is high if the screen surface is long. The larger the effective sieve area (that is, the ratio of the sieve hole area to the entire sieve surface area), the higher the productivity and screening efficiency per unit area of the sieve surface. The larger the sieve hole size, the greater the productivity per unit sieve surface and the higher the screening efficiency.