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

A production process, the technology of metal strontium, applied in the field of metal strontium, can solve the problems of high raw material prices and unacceptable product prices in the market

Inactive Publication Date: 2005-03-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although high-purity strontium carbonate can be used as raw material to produce industrial high-purity strontium by vacuum reduction dis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1 An aluminothermic primary vacuum reduction distillation production process for industrial production of industrial high-purity metal strontium:

[0013] The first step: using industrial strontium carbonate powder as raw material, calcining and decomposing at a high temperature of 1100-1400 ° C to obtain SrO powder, the industrial strontium carbonate powder used in this example is GB / T10660 industrial strontium carbonate powder, and the calcining temperature can be Selected as: 1350°C, 1100°C, 1400°C, 1250°C or 1186°C;

[0014] The second step: mix the SrO powder: Al powder according to the molar ratio of (1.5~2.0): 1, and press it into agglomerates. machine to press it into a shape that can be hung, for example: SrO and Al powder can be pressed into the shape of a scale weight, the ratio of the above SrO and Al powder can be selected as 1.5:1, 2.0:1, 1.65:1, 1.8:1 or 1.95:1;

[0015] The third step: hang the lump into the vacuum tank and put it in the reduct...

Embodiment 2

[0017] Example 2 The purity of strontium metal obtained by the method described in Example 1 is: Sr≥99.7%, impurities Ca≤0.05%, Ba≤0.10%, Fe≤0.01%, and the sum of other impurities≤0.05%.

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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...

Claims

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Application Information

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IPC IPC(8): C22B26/20
Inventor 谈荣生于金李凡蒋建清何义民
Owner SOUTHEAST UNIV
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