Fluidized bed roasting preparation method of Bi system high-temp. superconductive precursor body mother powder and its equipment

Abstract

The present invention discloses a fluidized bed roasting preparation method of Bi series high-temp superconducting precursor body mother powder and its equipment, belonging to the field of chemical preparation technology of functional material. The main body of the fluidized bed reactor is composed of lower portion reaction section and upper portion extension section. The periphery of the reaction section is equipped with an electric heating furnace the upper end of main body of the reactor is equipped with a cyclone separator, at the outlet of tail gas a gas analysis device and an alkali liquor neutralization and absorption device are mounted. In the reaction device of the fluidized bed the preparation of Bi series blue powder, denitration and subsequent brown powder phase conversion can be implemented.

Description

technical field [0001] The invention belongs to the technical field of chemical preparation of functional materials, in particular to a fluidized bed roasting preparation method and device for Bi-based high-temperature superconducting precursor mother powder. Background technique [0002] In the research on the formation of high-temperature superconducting materials, it was found that the preparation process of the original master powder has a significant impact on the superconducting properties of the final material, so the preparation of high-quality superconductor original master powder has always been an active part of the research field of superconducting materials . Zhou Wuzong and Liang Weiyao reported in "Basic Research on High Temperature Superconductivity" (Shanghai Science and Technology Press. Shanghai: 1999), in order to prepare high transport critical current density (J c ) strips, the master powder particles are required to be fine and have a suitable stoichi...

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Problems solved by technology

However, there are some problems in various methods at present: the process of solid-state reaction method is complicated, it is easy to mix impurities, and it is difficult to control; the co-precipitation method is easy to produce agglomeration in the process of preparing ultrafine powder, and the uniformity is not good; the sol-gel method generally uses metal Organic alkoxides are used as raw materials, the price is high, and there are few types in the domestic market; the powder produced by the hydrothermal method has a large particle size and is easy to segregate; the equipment manufacturing of the plasma vaporization method is relatively complicated and the cost is high; the self-propagating high-temperature synthesis method (SHS) requires metal Powder, and the resulting finished product has a larger particle size (μm level)

At present, the research in this area has not yet been reported in the literature and related patent applications.

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