Products Description
The mixing of powder materials is widely present in industrial production, making the mixing of powder materials play a very important role in the production process. For instance, in the production of food, agricultural fertilizers, ceramic materials and medicines, different materials or materials of different properties must be mixed evenly in a certain proportion, and then through certain processing procedures, the final product is obtained. During the production process, whether the distribution of powder is uniform directly affects the final performance of the product.
Material mixing
Material mixing refers to the change in position and velocity of two or more particles under the action of an external force (mechanical force or gravity), and through the relative movement of the particles and the mutual infiltration into each other's particle aggregates, it forms a complex motion process of multiple particles coexisting. Therefore, it causes the particles of each component to tend to be uniformly distributed. Due to the macroscopic continuity and microscopic discreteness of the particles, different properties of the particles exhibit a very complex chaotic process during the mixing motion of the disperse system.
Mixing mechanism
Although the process of mixing powder materials is complex and intricate, it still follows certain rules. According to the mixing mechanism, mixing can be mainly divided into three types: convective mixing, shear mixing, and diffusion mixing. Although these three mixing mechanisms are continuous in time, in practice, it is generally believed that the mixing of particles is the result of the combined action of these three mixing mechanisms, and they intersect with each other.
The three combined mechanisms
Convection mixing
Convection mixing refers to the phenomenon where particles are subjected to an external force, causing the discrete particles of different components to undergo significant positional movement in space. This mixing is achieved through the back-and-forth flow between individual particles, and it is usually quite intense but has a short duration. The result of this mixing is that the discrete particles gradually become uniformly distributed.
(2) Shearing mixture
Shear mixing is caused by the relative sliding of the dispersed particles. Due to the different velocities of each particle, shear mixing plays an important role in the kneading operation.
(3) Diffusion Mixing
Generally speaking, the local mixing that occurs between adjacent particles at the microscopic level is called diffusion mixing. Under the influence of an external force, the positions of adjacent particles change, resulting in mutual penetration and blending between the particles. When the mixing reaches the diffusion mixing stage, it is considered that complete mixing has been achieved.
Mixing process
The process of mixing can be roughly divided into three stages: the stage of convective mixing, the stage where convective and shear forces act together, and the stage where convective and shear forces operate independently.
The diffusion and mixing stage.
Phase 1: The main type of mixing in this stage is convective mixing, and the mixing speed is very fast.
Phase Two: This phase involves the combined action of convection and shear. The mixing duration is relatively short.
Long.
Phase 3: This phase is the diffusion mixing stage, during which the state of the mixture is in a state of equilibrium between mixing and separation.
The state is such that the homogeneity fluctuates around a certain value.
Mixing of powder particles
To achieve the homogenization of powder particles, external forces such as mechanical or fluid forces must be utilized. The mechanical properties of powder particles can be summarized as "dispersion" and "motion". The former refers to the dispersion of particle properties, particle size, and shape, while the latter refers to the transient motion, fluctuations, and collisions. When using a paddle to forcefully homogenize powder particles, there are many factors that affect the homogenization of powder particles, such as the particle properties of the powder, the structure of the mixing machine, process parameters, and the mixing environment. Experience shows that any change in any of these factors can have a significant impact on the homogenization process and effect.
Research on Mixing Equipment
The function of the mixing equipment is to moisten and homogenize the proportioned raw materials, meeting the requirements of uniform composition and appropriate moisture content, thus creating conditions for good product quality. Currently, the research on the structure and performance of the mixer not only focuses on the research on mixing and the structure of the mixer, but also pays attention to the influence of material properties on its mixing, such as particle size, material shape, moisture content of the material, etc., as well as the influence of mixing time and material filling rate on mixing.
There are numerous types of powder mixing equipment. According to the power structure, mixing equipment can be classified into mixers with a stirring shaft and those without a stirring shaft. Based on the layout form of the mixing machine, it can be divided into horizontal and vertical mixers. According to the working mode of the mixing machine, it can be categorized as fixed-body type and moving-body type. In actual industrial production, it is often necessary to design a mixer with multiple characteristics in combination according to the requirements. The size of the mixer, the layout of the stirrer, the structural parameters of the blades, and the distance between the stirrer and the bottom of the cylinder all determine its own characteristics.
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