Multifunctional electromagnetic vacuum smelting system

Abstract

The invention provides a multifunctional electromagnetic vacuum smelting system. The multifunctional electromagnetic vacuum smelting system comprises an electromagnetic inductor, a vacuum furnace shell and other components, the electromagnetic inductor is arranged on the outer cylindrical face of the vacuum furnace shell in a sleeving mode, a high-temperature heat insulation barrel is arranged between the vacuum furnace shell and a graphite crucible, magnetic lines emitted by the electromagnetic inductor penetrate through the vacuum furnace shell and the high-temperature heat insulation barrel to directly heat mineral aggregates in the graphite crucible, therefore, various mineral raw materials are smelted, and the smelting temperature is randomly adjusted within the range of 600-2,500 DEG C; wherein the nonmetal composite material is preferentially selected from composite ceramic mainly comprising high-purity calcium aluminate. According to the multifunctional electromagnetic vacuum smelting system, the gold inclusion is opened through a vacuum thermal decomposition method, so that the gold recovery rate is increased by 20%-30%, which is a major technical breakthrough in gold production; and other minerals needing arsenic and sulfur removal can be treated by the vacuum thermal decomposition method.

Description

technical field [0001] The invention relates to the technical field of electromagnetic vacuum smelting furnaces, in particular to a multifunctional electromagnetic vacuum smelting system. Background technique [0002] The vacuum furnace shells of all intermediate frequency electromagnetic vacuum melting furnaces at home and abroad are made of steel materials, and its electromagnetic inductor is placed in the middle of the steel vacuum furnace shell, and the heated crucible and materials are placed in the electromagnetic inductor in the middle. The serious disadvantage of this furnace structure is that the inductor works in a vacuum environment and cannot overcome the danger of vacuum discharge. This makes the control of current, voltage, electrical frequency, and vacuum degree strictly restricted, otherwise "vacuum discharge" will inevitably occur, which is the vacuum physical characteristic of electromagnetics. Therefore this furnace type structure cannot adapt to large-s...

AI Technical Summary

Problems solved by technology

The serious disadvantage of this furnace structure is that the inductor works in a vacuum environment and cannot overcome the danger of vacuum discharge.

[0004] 1. As mentioned earlier, the diameter difference between the steel vacuum furnace shell and the electromagnetic inductor must be ≥ 800 mm, so the steel vacuum furnace shell must be made very large, which makes the equipment cost very high

[0005] 2. Because the electromagnetic induction heat loss of the steel vacuum furnace shell is inevitable, this type of furnace structure makes the reactive power consumption of electricity large

[0006] 3. The structure of electrical appliances in the furnace is complicated, and there are electrical safety problems and difficult electrical maintenance problems

[0007] 4. Continuous automatic production is not possible, and the labor intensity of the operator is high

[0008] 5. Due to the limited control of parameters such as current, voltage, and electric power, it cannot meet the needs of mass production

[0016] 1. The vacuum furnace shell is made of glass fiber reinforced plastic. When the temperature of the furnace shell reaches 200°C, it will start to deform and delaminate, and serious air leakage will not guarantee the vacuum requirement.

[0017] 2. When the vacuum furnace shell is made of magnesia cementitious material, although it has high strength and no deformation, there is a small amount of air leakage, which cannot guarantee the vacuum requirement

[0018] 3. Using uranium ceramics from Jingdezhen as the vacuum furnace shell, although it has high temperature resistance, high strength, no cracking, and high air tightness, can meet the performance requirements of the furnace shell, but only small and medium-sized furnace shells can be fired, large or The extra-large vacuum furnace shell is difficult to fire, because of its large volume, it is difficult to ensure uniform temperature, large deformation, and there are traces of conductive impurities

[0019] 4. The vacuum furnace shell is made of quartz glass material, which has good airtightness, no deformation, no cracking, and high strength. It is a good material for the vacuum furnace shell, but the pouring and molding of liquid glass is difficult, and the technical requirements for the mold are very high. High, low yield can only reach 50%, not ideal

[0020] 5. Using polytetrafluoroethylene as the material of the vacuum furnace shell, the melting temperature is limited, and can only be used for metal melting with a melting temperature of ≤900°C

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