Are high-silicon cast copper coolers used for the finished nitric acid?
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Are high-silicon cast copper coolers used for the finished nitric acid? How effective is it? Who has the material composition, properties, and relevant standards for high-silicon cast copper? Shall we chat?
The building upstairs is probably a state-owned enterprise, so they have money. It can generally be used in high-silicon cast iron; the temperature of the finished product as it enters the cooler isn’t too high, and the stress levels are not excessive. It’s generally not bad. There are very few manufacturers that use high-silicon cast copper for the upper part of condensers.
It’s a private enterprise; they used to use KY705, which is made from imported materials, but its performance wasn’t good and the materials were very expensive. High-silicon cast iron is cheap, but it cannot withstand temperature changes
It seems there are no standards for high-silicon cast copper, and only a few manufacturers produce it across the country. Some manufacturers use them on the upper part of nitric acid condensers, in small quantities, mainly due to cost reasons. In fact, the finished acid cooler can be made of C4 steel or high-purity aluminum, with high-silicon cast copper used in certain areas to reduce costs. For reference
KY705 is a silicon-containing austenitic stainless steel grade from Beijing Keye; it does not seem to be imported. Coolers in China are basically made of high-purity aluminum.
An acid-cooled cooler made of high-silicon cast iron will do. Of course, polytetrafluoroethylene tube heat exchangers represent the direction of development.
Aluminum tubes cannot withstand high-temperature concentrated nitric acid; there is a temperature limit
Which are the manufacturers of high-silicon cast copper? Does anyone know?
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There are now only a few manufacturers in the country that produce high-silicon ferroalloys (two in Liaoyang, Liaoning, and one in Yantai, Shandong; the names are not mentioned to avoid any appearance of advertising). I had the opportunity to visit these facilities, and all of them are capable of producing such products, in accordance with the relevant standards for high-silicon ferroalloys (with adjustments made to the levels of other elements). What differs is that the manufacturers opt to replace certain components with high-silicon copper in order to improve heat exchange efficiency; however, no concrete examples of this practice have been seen yet, and further verification is needed.
Let me talk about Liaoyang Dongling and Yantai Hengbang