A Surface Treatment Process for Stainless Steel Triangular Spiral Packing

Abstract

The invention belongs to the field of material surface cleaning and treatment. In order to overcome defects in a conventional, the invention provides a surface treatment technology for stainless-steel triangular spiral packing. The technology comprises the following steps: (1) ultrasonic oscillation cleaning; (2) aqueous aqua regia solution steeping; (3) aqua regia oxidation treatment; and (4) cleaning and drying. After the stainless-steel triangular spiral packing is treated by the surface treatment technology, grease on the surface of the stainless-steel triangular spiral packing is completely removed, and the technology obviously improves the surface properties of the packing as compared with the conventional technology and enables the packing to easily obtain a good separation effect during use. The consumption of water and heat is low during a treatment process, the batch treatment capacity is high, the treatment speed is high, no undesirable impurity is introduced, the labor intensity of operating personnel is low, an adopted reagent is easy to obtain and low in price, the treatment process has high safety, and produced waste liquid is neutralized with sodium carbonate to be neutral to meet emission requirements.

Description

technical field [0001] The invention belongs to the field of material surface cleaning and treatment, in particular to a surface treatment process for stainless steel triangular spiral packing. Background technique [0002] Among the commonly used metal packings, the triangular spiral packing, as a high-efficiency precision packing, is widely used in the fields of chemical product production, nuclear industry isotope separation and purification, etc. Triangular spiral packing belongs to Fenske Spiral, which is made of metal wire, and its shape is similar to spring, so it is also called triangular spring packing. The difference between its shape and the spring is that each coil is not a circle but a triangle, and the adjacent triangles are staggered by a certain angle. The separation equipment using triangular spiral packing has the advantages of high separation efficiency and uniform gas-liquid distribution. [0003] From the material point of view, the triangular spiral p...

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Problems solved by technology

However, these methods all have insufficient improvement of the surface properties of the filler, making it difficult for the filler to obtain a better separation effect when used

[0005] For the removal of surface grease, the existing processes mainly include the washing spirit method, the acetone method and the lye method, wherein the washing spirit method uses commercially available washing spirit as a surfactant, and the filler is degreased by boiling an aqueous solution. However, The amount of dissolved oil in the aqueous solution is limited, the consumption of water and heat is large, and the work intensity of the operators is high; although the acetone method has a good degreasing effect, it is a controlled chemical, and the personal hazards are obvious. The workload of the operators is heavy. The batch processing volume is small, and it will produce toxic waste liquid; and for the lye method, its effect in actual degreasing is not ideal

[0006] Generally speaking, the above methods still have many problems such as easy introduction of impurities such as organic carbon, cumbersome and heavy surface treatment operations, and low safety to a certain extent.

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