Primary vacuum reduction distillation production process by thermit process and metallic strontium

Abstract

Aluminothermy one-time vacuum reduction distillation process used in industrialized production of high purity strontium is provided. Industrial strontium carbonate powder is used as material. After high temperature calcining and decomposition, SrO powder is obtained, then mixed with Al powder according to a certain mol ratio, then pelletized, suspended in vacuum tank and placed in reduction furnace. At last SrO is reduced to Sr by Al under a certain vacuum degree and high temperature, and distilled and purified. Purity of metal strontium is higher or equal to 99.7%, impurity of Ca lower or equal to 0.05%, Ba<=0.10%, Fe<=0.01%, and other impurity is lower or equal to 0.05%. The invention shortens the production cycle, needing only one time reduction and distillation, reduces the production cost.

Description

technical field

[0001] The invention relates to a method for producing industrial high-purity metal strontium through thermite reduction and distillation purification and the metal strontium obtained by the method, in particular to a production process of metal strontium by the thermite one-time vacuum reduction distillation and metal strontium. technical background

[0002] At present, the industrial production methods of metal strontium include molten salt electrolysis method and vacuum aluminum powder thermal reduction method. Calcium, strontium, and barium are also known as alkaline earth metals, which are listed in group II-A elements in the periodic table. They have similar chemical properties and are often companions in their ore-bearing types. When one element is extracted, the other two elements are often brought out to form impurities. phase, reducing the purity of the extract. As a raw material for extracting strontium metal SrCO 3 , gen...