Preparation method of calcium fluoride crucible

Abstract

The invention belongs to the technical field of preparation of special crucibles, and particularly relates to a preparation method of a calcium fluoride crucible. The preparation method comprises the following steps of filling a calcium fluoride raw material by using a special charging hopper, and compacting the calcium fluoride crucible by using a hydraulic machine and a circular cylindrical pressure-bearing device; demolding the compacted calcium fluoride crucible, and repairing an outer edge opening of the crucible by using an organic glass scraper to obtain a molded calcium fluoride crucible; drying the formed calcium fluoride crucible; calcining the dried calcium fluoride crucible; and cooling the calcined calcium fluoride crucible to room temperature, and storing for later use. According to the method, the quality and yield of the calcium fluoride crucible can be effectively improved, the production cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of preparing a special crucible, and in particular relates to a method for preparing a calcium fluoride crucible. Background technique [0002] The calcium fluoride crucible has a conical structure and is made of double-layer materials. The inner layer is made of calcium fluoride material, and the outer layer is made of nickel metal material as the cladding. During manufacture, the calcium fluoride base material needs to be compacted and formed into an inner lining. [0003] In the reduction process of a certain metal, it is necessary to use a calcium fluoride crucible to hold the raw materials for the chemical reaction, and then carry out the chemical reaction. The high temperature generated by the chemical reaction will not pollute a certain molten metal, thereby ensuring the purity of the product. At the same time, the calcium fluoride base material and the metal product can be effectively separated when...

AI Technical Summary

Problems solved by technology

[0008] (a) The molding quality of the calcium fluoride crucible is poor, the thickness of the bottom of the crucible is uneven, the tapered transition section cannot be compacted, cracks appear, the defective rate is high, and manual repair is required

[0009] (b) During the metal reduction process, due to cracks at the bottom of the crucible, the appearance of the product cannot meet the requirements of the buyer

[0010] (c) The pressure is transmitted by manually tapping the mold core with a metal hammer. There is uneven force, the strength of the crucible cannot be effectively guaranteed, and the life of the mold core is short.

[0011] (d) Due to the unevenness of manual force, in order to ensure the strength of the crucible, it is necessary to increase the amount of calcium fluoride filler to increase the thickness of the crucible. When a single calcium fluoride crucible is prepared using clinker calcium fluoride as a raw material, a large amount of raw materials is required , up to 2.5-2.6kg, high production cost

[0012] (e) Since the crescent-shaped tamping tool forms a 120° torus, only one-third of the torus can be compacted each time. When the hammer hits the tooth-shaped tamping tool for compaction, the remaining three The second area is not under pressure, causing the mold core to deviate from the center line, and the center line of the collection pit also deviates accordingly, resulting in defective crucibles

[0013] (f) The preparation of a single crucible takes about 25 minutes, the production efficiency is low, and the labor intensity is high. In the production of a large amount of metal reduction, the effective supply cannot be guaranteed

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