The application field and depth of filtration equipment are still expanding

Zyzhan guide: Today, in addition to the high requirements for energy conservation and environmental protection, enterprises have put forward higher and broader requirements for solid-liquid separation technology and equipment. For the social needs of mineral processing, metallurgy, petroleum, coal, chemical, food, environmental protection and other industries, the application of solid-liquid separation technology and equipment, especially filter products, has been promoted, and the breadth and depth of its application fields are still expanding.

The reason why the filter can flourish and be widely used in various industries, its greatest advantage is positive pressure, high pressure pressure dehydration, the pressure difference is much larger than the traditional vacuum filter, so the filter cake has low water content and low energy consumption. The metal loss is small and the filtrate is clear and transparent. As early as more than a decade ago, experts pointed out that the filter is the only equipment in all industrial filters that can ensure that the filter cake moisture reaches less than 10%, and can be free of flocculant.

In terms of the form of the filter plate, the filter has a box type and a plate frame type; the filter plate is placed in different orientations, and there are vertical and horizontal parts; the filter plates are of different materials, and there are plastic, rubber, cast iron, and cast. Steel, carbon steel, stainless steel; whether the filter plate is equipped with rubber extrusion film, there are extrusion dewatering and non-extrusion dewatering; on the filter plate configuration filter cloth surface is different, there are single-sided dewatering and double-sided dewatering Points and so on.

However, regardless of the filter press, the working principle is firstly positive pressure dehydration, also known as slurry dewatering, that is, a certain number of filter plates are closely arranged in a row under the action of strong mechanical force, the filter plate surface and the filter plate surface. A filter chamber is formed between the filter material and the filter material is sent to the filter chamber under a strong positive pressure, and the solid portion of the filter material entering the filter chamber is trapped by the filter medium to form a filter cake, and the liquid portion is discharged through the filter medium and discharged out of the filter chamber. For the purpose of solid-liquid separation, solid-liquid separation is more complete with the increase of positive pressure, but from the perspective of energy and cost, too high positive pressure is not cost-effective.

After the slurry is dehydrated, a filter press equipped with a rubber extruded film is used, and a compressed medium (such as gas or water) enters the back surface of the extruded film to push the extruded film to further dehydrate the extruded filter cake, which is called extrusion dehydration. After the slurry is dehydrated or squeezed and dehydrated, the compressed air enters the filter cake side of the filter cake through the filter cake, and the liquid water is carried out from the other side of the filter cake through the filter cloth and discharged from the filter chamber to be dehydrated.

If the filter cloth is applied to both sides of the filter chamber, the liquid portion can pass through the filter cloth on both sides of the filter chamber and exit the filter chamber to dewater the filter chamber on both sides. After the dewatering is completed, the mechanical pressing force of the filter plate is released, and the filter plate is gradually opened by a single piece, and the filter chamber is opened separately to perform the unloading of the cake as a main working cycle.

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The chair side CAD / CAM repair system has obvious advantages in aesthetic effect, operation time, patient participation and operation convenience. Discussion: traditional repair method: after the model is transferred, it will be sent to the technician's room for processing and making the final prosthesis. About one week, the final prosthesis will be tried on, grinded and bonded. The prosthesis was made in the technician's room. The patients need to accept the aesthetic effect of the prosthesis passively without any sense of participation. The implant repair method of chair side CAD / CAM system: obtain computer three-dimensional model by blue light scanning method, design and make personalized abutment and all ceramic restoration on computer, dye, glaze and bond after trial wearing, the whole restoration is made by chair side, patients can directly participate in the restoration design, and feel more involved. Conclusion: in the implant area of the anterior teeth, compared with the traditional implant repair method, the chair side repair system can get more satisfactory results, which is worthy of clinical application and promotion.

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