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Centrifuge selection should pay attention to the following aspects?

Technical Knowledge 2019-02-28 20:19:24
Laboratory centrifuges are instruments that use centrifugal force generated by a rotating rotor to separate substances of different densities and different particle sizes in a suspension or emulsion, or to perform analysis while separating. It has a wide range of applications and is suitable for use in laboratories such as chemical, food, pharmaceutical, environmental, mining, and teaching. But how to choose a suitable centrifuge should start from the following aspects:

1. anti-corrosion performance

The materials separated by the centrifuge generally have a certain degree of corrosiveness, and the material in contact with the material must meet the corrosion resistance requirements, and ensure safe use. Structural material, gasket material, surface treatment, and material of the filter cloth should be determined at the time of selection. We can inform the company of the nature of the material (chemical properties, temperature during separation, etc.) at the time of selection, so that our company can propose the selection of the centrifuge material according to the hungry characteristics of the separated medium, and indicate it in the order to ensure The anti-corrosion requirements of the centrifuge.

2. explosion-proof performance

If the material processed by the centrifuge contains flammable and explosive substances such as organic solvents, the centrifuge should have explosion-proof performance. Explosion-proof performance is determined by the explosion-proof requirements of the process. In the previous explosion-proof occasions, only the explosion-proof motor was proposed. In the past two years, most of the cases where the treated materials contained organic solvents such as solvents, the requirements for helium gas protection were proposed. In fact, the centrifuge should realize the explosion-proof in the true sense. It can take many measures in the preparation of mechanical and electrical accessories, such as explosion-proof motor, explosion-proof lighting, anti-static belt, anti-collision measures, safety interlocking device and nitrogen protection device. , non-contact energy brake, static grounding, automatic explosion control and so on. Therefore, the customer must specify the characteristics of the required separation medium, explosion-proof requirements and grades when ordering.

3. separation performance

Separation performance is a basic function of Zui, including separation effect, washing effect, processing capacity, degree of automation, etc. Due to differences in material properties, including material viscosity, density, solid-liquid ratio of slurry, etc., it is difficult to accurately To determine the effect of the final separation of zui, in general, the separation factor is an important factor affecting the separation effect of the centrifuge. The separation factor is related to the rotation speed of the drum and the diameter of the drum, and is proportional to the square of the angular velocity of the drum.

Washing refers to the washing of the filter cake. For some materials, the filter cake needs to be washed by the washing liquid, and some even have to be washed several times to meet the requirements. This requires the preparation of the washing tube, the washing effect and the washing time. It has a great relationship with the pore size, arrangement position and structure of the washing tube. The processing capacity of the centrifuge is related to the physicochemical properties of the material and the separation requirements, and is generally estimated by the number of cycles per hour and the quality of the filter cake in a single run.

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