Preparation method of nuclear-grade zirconium alloy return scrap cast ingots

Abstract

The invention discloses a preparation method of nuclear-grade zirconium alloy return scrap cast ingots. The preparation method comprises the steps that 1, nuclear-grade zirconium alloy return scrap isidentified and classified; 2, pretreatment is conducted on the zirconium alloy return scrap same as nuclear-grade zirconium alloy return scrap cast ingots in mark or containing similar chemical component to the cast ingots; 3, the zirconium alloy return scrap subjected to pretreatment is selected and prepared into a consumable electrode and a zirconium block; 4, vacuum consumable smelting is conducted on the consumable electrode and a zirconium block to obtain the nuclear-grade zirconium alloy return scrap cast ingots. According to the mass content of O and N in the nuclear-grade zirconium alloy return scrap cast ingots, the nuclear-grade zirconium alloy return scrap containing different mass contents of O and N is selected, the mass contents of O and N in the nuclear-grade zirconium alloy return scrap cast ingots are accurately controlled, the nuclear-grade zirconium alloy cast ingots containing components conforming to GB / T13747 zirconium and zirconium alloy chemical analysis methodare obtained, effective recovery of zirconium alloy return scrap is achieved, and the recovery rate of the zirconium alloy return scrap is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of nuclear-grade zirconium alloy preparation, and in particular relates to a method for preparing a nuclear-grade zirconium alloy return ingot. Background technique [0002] After entering the 21st century, my country's nuclear power industry has entered a stage of rapid development. The demand for nuclear-grade zirconium alloys as cladding materials for nuclear power has increased significantly, and the localization of nuclear-grade zirconium alloys is also gradually progressing. However, the finished product rate of nuclear-grade zirconium alloy processing is low, and a large amount of zirconium alloy return materials are produced during the production process. Usually, the zirconium alloy return materials generated during the processing of nuclear-grade zirconium alloy account for about 20% to 60% of the input amount of raw materials; in addition , The industry's internal demand to reduce costs to partici...

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Problems solved by technology

However, the finished product rate of nuclear-grade zirconium alloy processing is low, and a large amount of zirconium alloy return materials are produced during the production process. Usually, the zirconium alloy return materials generated during the processing of nuclear-grade zirconium alloys account for about 20% to 60% of the input amount of raw materials; in addition , the industry's internal demand to reduce costs and participate in international competition and the external pressure of environmental protection make the recycling of nuclear-grade zirconium alloy return materials an urgent problem to be solved in the nuclear-grade zirconium alloy production industry

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