In the investment casting industry, steel castings are the most used castings in the manufacturing industry, and are widely used in equipment, agricultural machinery, machining, and automobile industries. Metal castings can produce parts with complex shapes, but there are also requirements for the design of the product structure. In the case of meeting the requirements of use, it should also try to comply with the casting process. For example, in the structural design, care should be taken not to have thin walls, which may easily lead to dissatisfaction with pouring or product deformation; for example, try not to have sharp corners, try to use radian transitions; and try not to appear small and deep blind holes, It will cause great trouble for foundry sand cleaning. Of course, there are many other structural problems. We will improve and optimize the product structure according to the customer's drawings without changing the customer's functional use, so as to maximize the product qualification rate and production efficiency. In some cases where the structure cannot be changed, we will also perform some follow-up processing after casting according to actual problems, so that the expected results can also be achieved.
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[China Instrument Network Instrument R&D] Recently, Professor Cui Hairong of Wuchang University of Technology successfully used ion chromatography technology to successfully determine the content of fluorine and chlorine in concentrates, and became the global convener and person in charge of the development of international standards for this technology.
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Ion chromatography is a kind of high-performance liquid chromatography, so it is also called high-performance ion chromatography (HPIC) or modern ion chromatography. Its main difference from traditional ion exchange chromatography is that the resin has a high degree of crosslinking and low The exchange capacity and the injection volume are very small. The continuous emissive conductivity detection of the leachate is usually carried out by the plunger pump delivering the eluent.
In addition, ion chromatography is mainly used for the analysis of environmental samples, including the anions and cations in surface water, drinking water, rainwater, domestic sewage, and industrial wastewater, acid deposition, and atmospheric particulates, and water and reagents related to the microelectronics industry. Trace impurities in the analysis.
According to reports, fluorine and chlorine in copper, lead, and zinc concentrates will not only corrode pipes during the smelting process, but also cause pollution in the atmosphere after high-temperature calcination. The new ion chromatography technology developed by the team of Cui Hairong, a professor at Wuchang University of Technology, can quickly detect harmful elements and can help workers find fluorine and chlorine in the concentrates early so as to solve problems.
At present, the international method for determining the content of chlorine in concentrates is not perfect, and Cui Hairong uses ion chromatography technology to have a good effect on the determination of low levels of chlorine in concentrates, and as a national standard, it has subsequently been recognized by other countries. .
(Original title: Chromatography Technique for Determining Concentrate Fluorine and Chlorine)
November 08, 2024