Fluoroplastics in the petrochemical industry in the national economy occupies a very important position, chemical process pump as a key supporting equipment is also more and more attention to the recycling of fluoroplastics manufacturers. Due to the complex characteristics of chemical media, coupled with the increasing requirements of users, as a manufacturer of recycled fluoroplastics, how should we select the type?... And so on is particularly important. Now combined with my company long-termRecycling fluoroplasticsThe business experience and personal superficial understanding of the commonly used fluorine plastic chemical pump selection for a brief review, hoping to be beneficial to colleagues in the field to better carry out the work.

Corrosion resistance problem

For a long time, corrosion is one of the most headache hazards of chemical equipment. A little carelessness can damage the equipment, or cause accidents or even disasters. According to relevant statistics, about 60% of the damage of chemical equipment is caused by corrosion, so the selection of chemical pumps should first pay attention to the scientific nature of material selection. There is usually a misunderstanding that stainless steel is a "universal material", no matter what the medium and environmental conditions are held out of stainless steel, which is very dangerous.

The following recycling fluorine plastic manufacturers for some common chemical media to talk about the main points of material selection:

1. As one of the strong corrosive medium, sulfuric acid is an important industrial raw material with a wide range of uses. Sulfuric acid of different concentrations and temperatures has great difference in corrosion of materials. For concentrated sulfuric acid with concentration above 80% and temperature less than 80 ℃, carbon steel and cast iron have good corrosion resistance, but it is not suitable for sulfuric acid flowing at high speed and is not suitable for pump valve materials. Ordinary stainless steel such as 304(0 Cr18Ni9) and 316(0 Cr18Ni12Mo2Ti) are also limited in use for sulfuric acid medium. Therefore, the pump valve for conveying sulfuric acid is usually made of high silicon cast iron (difficult to cast and process) and high alloy stainless steel (alloy No. 20). Fluoroplastics have better resistance to sulfuric acid, the use of fluorine pump (F46) is a more economical choice. Applicable products are: IHF fluorine pump, PF(FS) strong corrosion-resistant centrifugal pump, CQB-F fluorine plastic magnetic pump, etc.

Most metal materials are not resistant to hydrochloric acid corrosion (including various stainless steel materials), and molybdenum-containing high silicon iron can only be used for hydrochloric acid below 50 ℃ and 30%. In contrast to metal materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so rubber-lined pumps and plastic pumps (such as polypropylene, fluoroplastics, etc.) are the best choice for conveying hydrochloric acid. Applicable products are: IHF fluorine pump, PF(FS) strong corrosion-resistant centrifugal pump, CQ polypropylene magnetic pump (or fluorine plastic magnetic pump), etc.

This article comes from:www.tflpfa.com

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