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Preparation method of high-purity metallic strontium and high-purity metallic strontium prepared through same

A metal strontium and high-purity technology, applied in the field of high-purity metal strontium, can solve the problems of insufficient yield, low reduction yield and high impurity content, and achieve the effects of low reduction temperature, low impurity content and high yield

Active Publication Date: 2017-05-24
厦门稀纯材料科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

The purity of metal strontium prepared by the existing vacuum thermal reduction process is less than 99wt.%, and the purity achieved by the optimized thermite reduction method can only reach 99.5wt.%, and there are technical difficulties in further improving the purity, especially for Ba in metals. , Ca and other impurities are still high, and the existing mature technology still has the problem of low reduction yield, usually less than 75%

Method used

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  • Preparation method of high-purity metallic strontium and high-purity metallic strontium prepared through same
  • Preparation method of high-purity metallic strontium and high-purity metallic strontium prepared through same
  • Preparation method of high-purity metallic strontium and high-purity metallic strontium prepared through same

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preparation example Construction

[0027] The invention discloses a method for preparing high-purity metal strontium and a high-purity metal strontium prepared by the method. The preparation method uses strontium oxide as raw material and metal lanthanum as a reducing agent. Lanthanum is reduced to metal strontium vapor, which is collected by a condenser to obtain block or filamentous high-purity metal strontium.

[0028] The above-mentioned method of the present invention uses industrially pure strontium oxide as a raw material, and strontium oxide is obtained by calcining strontium carbonate at 1200-1250°C for 20-30 minutes. Lanthanum is selected from raw materials with less volatile impurities under the condition of 950~1200°C. According to the enlightenment of the present invention, those skilled in the art can choose one of lanthanum, cerium, praseodymium and neodymium, or their mixed metals.

[0029] In the above method of the present invention, the metal lanthanum reducing agent is prepared into a shape...

Embodiment 1

[0038] In the atmospheric environment, put 5kg of strontium carbonate into an alumina crucible, put it into a muffle furnace and calcinate at 1200°C for 20min to decompose it into oxides, and cool it naturally for later use;

[0039] The metal lanthanum block is turned into fine chips with a thickness of no more than 0.5mm by lathe, and the turning speed is not higher than 50 rpm to prevent the oxidation of the lanthanum chips. After turning, the chips are immediately put into a plastic bag and filled with argon to keep fresh surface;

[0040] Mix the decomposed strontium oxide and lanthanum chips in a molar ratio of 1.4 to 1, place a steel pipe in the middle of the titanium tank, pour the mixed material into the titanium reduction tank, and compact it while pouring. After the material is pressed, the steel pipe is slowly drawn out, and a hollow slightly larger than the steel tank is formed in the middle of the material body, which is used for the overflow of metal strontium v...

Embodiment 2

[0047] In the atmospheric environment, put 5kg of strontium carbonate into an alumina crucible, put it into a muffle furnace and calcinate at 1230°C for 25min to decompose it into oxides, and cool it naturally for later use;

[0048] The metal lanthanum block is turned into fine chips with a thickness of no more than 0.5mm by lathe, and the turning speed is not higher than 50 rpm to prevent the oxidation of the lanthanum chips. After turning, the chips are immediately put into a plastic bag and filled with argon to keep fresh surface;

[0049] Mix the decomposed strontium oxide and lanthanum chips in a molar ratio of 1.35 to 1, place a steel pipe in the middle of the titanium tank, pour the mixed material into the titanium reduction tank, and compact it while pouring. After the material is pressed, the steel pipe is slowly drawn out, and a hollow slightly larger than the steel tank is formed in the middle of the material body, which is used for the overflow of metal strontium ...

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Abstract

The invention discloses a preparation method of high-purity metallic strontium and high-purity metallic strontium prepared through the same. Strontium oxide serves as a raw material, metallic lanthanum serves as a reductant, under a vacuum condition, the strontium oxide is reduced into metallic strontium steam by the metallic lanthanum, the block-shaped or silk-shaped high-purity metallic strontium is obtained through collecting of a condenser, the collecting rate is larger than 85%, and the purity of the metallic strontium reaches 99.9 wt.% or more. According to the preparation method of the high-purity metallic strontium and the high-purity metallic strontium prepared through the same, the reductant is optimally selected, and the technical condition is controlled, so that the metallic strontium is reduced, impurities are not reduced, and the reduced metallic strontium does not form a metallographic phase with the reductant; and thus the problems that preparation of the metallic strontium is difficult to be high in purity, and the collecting rate is low are solved, so that a metallic strontium product with the purity being higher than 3N is obtained by using industrial pure raw materials.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing ultra-high-purity metal strontium and a kind of high-purity metal strontium prepared by the method. Background technique [0002] Strontium is a silvery-white alkaline earth metal with a yellowish sheen. It is the least abundant element among alkaline earth metals (except beryllium). Exist in a compound state in nature. Metal strontium is widely used in electronic information, chemical industry, light industry, medicine, ceramics, metallurgy and other industries. The traditional preparation methods of metal Sr mainly include molten salt electrolysis and vacuum thermal reduction. Molten salt electrolysis has problems such as high raw material prices, environmental pollution by chlorine gas, large volatilization loss of strontium salts, and serious corrosion of electrolytic equipment; vacuum thermal reduction There are mainly aluminothermic method and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/20C22B9/02C22B9/04
CPCC22B9/02C22B9/04C22B26/20Y02P10/20
Inventor 王玉科王萍
Owner 厦门稀纯材料科技有限公司
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