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The technique of producing pure metals, high purity metals or pure compounds is often referred to as refining. It is very delicate and requires strict control of operating conditions, the use of pure chemical reagents and pure water, as well as the cooperation of sensitive and reliable analytical testing methods. Platinum ore resources, often 8 kinds of precious metal elements coexist, secondary resources also have a large number of gold, silver separation and recovery and refining problems.
In the early days, the product form of refining process was mainly pure metal ingots and sponge metal. With the development of new energy, microelectronics, chemical catalysis, biomedicine, functional materials and other high-tech industries, the demand for special functional compounds of precious metals and nano-powder materials has been growing. If pure metals are used as raw materials to prepare compounds, some metals (such as platinum, palladium, rhodium, iridium, hunger, ruthenium) are very difficult to dissolve, which not only complicates the process, but also increases reagent consumption and processing costs. Therefore, it has become an important part of refining technology development to adjust the refining process structure according to the market demand and directly produce various precious metal fine chemical products and nano-material products that meet the requirements.
The refining process produces pure intermediates of compounds, which is the basic condition for the preparation of fine chemical products. In the refining technology of each metal, some important compound products are introduced suggestively, indicating that the refining process needs to be connected with the production of fine chemical products. However, the refinement of precious metals. The variety and specifications of industrial products need to be combined with the special requirements of new energy, microelectronics, chemical catalysis, biomedicine, functional materials and other technologies for design and preparation, which are beyond the knowledge of precious metal refining.
