Lithium oxide centrifugal bead-making method and device

Abstract

The invention discloses a centrifugal bead-making method of lithium oxide beads in nuclear fusion blankets and belongs to the technical field of material forming and control. The lithium oxide centrifugal bead-making method comprises the following steps that molten or pulped lithium oxide is dripped or flows into a rotating shaft disc, under the action of centrifugal force, the lithium oxide is made into beads, and the beads are collected and cooled through coolants to achieve fixing and forming. The lithium oxide bead-making process and device is simple in operation, universal and economic and applicable to preparation of various lithium oxide beads through a melting method or a wet process, the discharging and ball-making speed is fast, design and manufacturing difficulty of the discharging hole and the bead-making device is avoided, yield and particle size of made balls can be flexibly adjusted through the adjustment of material flow of lithium oxide and / or the rotating speed of the shaft disk, convenience and high efficiency are obtained, and preparation scale of lithium oxide tritium breeding agent beads can be greatly improved.

Description

technical field [0001] The invention relates to a method for making micro balls, in particular to a centrifugal ball making method for lithium oxide balls in nuclear fusion cladding, and belongs to the technical field of material forming and control. Background technique [0002] The fusion reactor uses a tritium breeder to react with neutrons to generate tritium to ensure the "self-sustainability" of its fuel, that is, the tritium consumed by the fusion reaction can be compensated by the tritium produced by the fusion reactor. To this end, every fusion reactor is designed with a tritium-producing envelope, the tritium-breeding envelope. In the breeding envelope, a lithium-containing material is usually used as a breeding agent to react with neutrons to generate tritium. [0003] Li 2 O, LiAlO 2 , Li 2 ZrO 3 , Li 2 TiO 3 and Li 4 SiO 4 Lithium ceramic materials are the main candidates for tritium-producing materials for fusion reactors due to their good chemical sta...

AI Technical Summary

Problems solved by technology

[0005] The melting method (including spraying and dripping) is suitable for one-step preparation of high-density lithium oxide ceramic pellets, but the production scale is limited, and the annual output of the laboratory does not exceed 250Kg / a; due to the direct contact between the gas nozzle and the discharge port or the gap Small, the outlet is cooled by the gas, which is easy to cause material blockage. In addition, the purge gas is an inert gas, with fast injection rate, large gas consumption, and high cost. The particle size of the ball is mainly controlled by the gas flow rate and material pressure, which is difficult To achieve steady-state operation, the particle size control is difficult, the distribution range is wide and the energy consumption is large

[0006] Extrusion molding method, sol-gel method, etc. belong to wet process. After adding binder to the precursor of the mixture and mixing evenly, a suspension slurry or gel is formed, which is dropped into an organic liquid or a cold bath to form a Lithium ceramic balls are obtained by drying and sintering, which is easy to operate, but the ceramic microspheres prepared by it have low density (70% T.D ~ 80% T.D), poor formability, rough surface, and easy to drop powder; and wet method The lithium-based mixture green body prepared by the process requires high-temperature sintering to obtain ceramic microspheres; the laboratory output is less than 100Kg, and the pH value, reactant concentration ratio, temperature, organic impurities, etc. will affect the performance of the gel beads

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