At present, users in domestic metallurgy, casting, machinery and other industries are analyzing the trace element composition of metal materials other than carbon and sulfur
1. NKP-8 type spectrum analyzer. The advantage is that a variety of elements can be analyzed at a time, and the accuracy is higher. The disadvantage is that the price is too high, a set of hundreds of thousands to millions, so only a few large enterprises currently use. 2. Spectrophotometer. The advantage is that the detection wavelength is convenient to choose, and the price is not high. The disadvantage is that the test results cannot be displayed directly (to be converted); there is no curve to establish the calling function, and the different elements must be recalibrated every time when detecting different elements; the cuvette is inconvenient to put in and pour out the liquid; the basic knowledge of chemical analysis is high Therefore, it cannot meet the needs of on-site online inspection and analysis of enterprises. 3. Colorimetric element analyzer. The advantage is that it is easy to use, the price is not high, and the basic requirements for the chemical analysis of the operator are not high, so it is widely used for on-site analysis of enterprise production inspection. However, due to its historical reasons, there are the following birth defects.
2. The photoelectric colorimetric metal element analyzer was developed in China in the 1960s to meet the needs of on-site online detection and analysis of the five major elements of iron and steel metallurgy (carbon, sulfur, silicon, manganese, phosphorus). An element analyzer was developed for the detection of silicon, manganese, and phosphorus (then called three elements, and the three channels were preset to detect silicon, manganese, and phosphorus at fixed wavelengths. Since the wavelengths required for the detection of silicon, manganese, and phosphorus are not many, the accuracy requirements are not high. Therefore, the three-element analyzer satisfies the needs of the iron and steel metallurgical industry on-site. It is necessary to analyze the content of elements. But now, in addition to steel, the materials to be tested in various industries are also copper alloys, aluminum alloys, and zinc alloys. From silicon, manganese, phosphorus to copper, chromium, nickel, zinc, magnesium, tungsten, vanadium, niobium, titanium, molybdenum, aluminum, arsenic, zirconium, boron, rare earth elements and other elements.
The following defects that are common in traditional photoelectric colorimetric metal element analyzers are increasingly manifested: the measurement wavelength is preset and fixed, and cannot be continuously adjusted, although some models can be replaced (by replacing the filter or light-emitting diode) However, it is still too cumbersome for users. It is especially inconvenient when it comes to measuring the types of elements that exceed the number of channels of the instrument or to detect different alloy materials. And not all filters and LEDs of all wavelengths can be purchased, making it difficult to measure certain elements. For example, the measurement of magnesium requires a light source of 576nm, and filters and LEDs of such wavelengths are not available.
3. The measurement light source is mostly a DC bulb plus a filter or a cold light-emitting diode, and its wavelength accuracy is poor. The wavelength accuracy of the DC bulb plus filter method depends on the filter. Most of the filter used in the element analyzer can only achieve ± 15nm. The wavelength accuracy of light-emitting diodes depends on the diodes used, and most of the error ranges from 20 to 30nm, which cannot guarantee the accuracy of analysis and detection.
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