Method for preparing Mg-Sr alloy by electrolyzing MgO and SrO in same trough

An alloy and electrolyte technology, which is applied in the field of electrolysis of MgO and SrO to prepare magnesium-strontium alloy in the same cell, can solve the problems of low driving force for leaching reduction, low reduction rate of strontium compound, and large strontium volatilization loss, etc. The effect of low manufacturing cost and less volatilization

Inactive Publication Date: 2007-12-12
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Since the smelting temperature of magnesium alloy is 600-800°C, at this temperature, the immersion reduction driving force of strontium is small, and the reduction rate of strontium compounds is low, so it is only suitable for adding a small amount (hardly higher than 0.1 %wt) strontium; when the temperature rises, the driving force of strontium immersion reduction increases, but the volatilization loss of strontium also increases, and the utilization rate of strontium is also low (usually less than 30%)
Therefore, the immersion reduction method has low strontium utilization rate and poor economy, and is not suitable for the preparation of Mg-Sr alloys with high Sr content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of a solid cathode: 785g of MgO, 30g of SrO, 5g of calcium carbonate and 5g of magnesium stearate are pulverized to 0.03-0.10mm, mixed uniformly, compacted into a disc under a pressure of 30MPa and then sintered to form a solid cathode;

[0021] (2) Preparation of electrolyte molten salt: 4Kg of CaCl with a mass ratio of 7:3 2 -NaCl mixture is fully dehydrated at 350°C, mixed evenly, added to the electrolytic tank, heated and melted to become electrolyte molten salt;

[0022] (3) Implement electrolysis: immerse the solid cathode in the molten salt; introduce the graphite anode into the molten salt, and the cathode conductor into the solid cathode; the electrolysis temperature is 650°C, and the working voltage of the electrolyzer is 2.5V; direct current electrolysis;

[0023] (4) Discharging: After the electrolysis is completed, the electrolyte molten salt in the electrolytic tank is removed to obtain the Mg-Sr alloy formed by electrolysis. Its chemical ...

Embodiment 2

[0025] (1) Preparation of solid cathode: 68.2g of magnesium carbonate with a MgO content of 96%, 1.2g of SrO and 10g of calcium carbonate are crushed to 0.06-0.11mm, mixed evenly, compacted into a disc under a pressure of 40MPa and then sintered solid cathode;

[0026] (2) Preparation of electrolyte molten salt: 2.8Kg NaCl was fully dehydrated at 350°C, mixed evenly, added to the electrolytic cell, heated and melted to become electrolyte molten salt;

[0027] (3) Implement electrolysis: immerse the solid cathode in the molten salt; introduce the graphite anode into the molten salt, and the cathode conductor into the solid cathode; the electrolysis temperature is 700°C, and the working voltage of the electrolyzer is 3.1V; direct current electrolysis;

[0028] (4) Discharging: After the electrolysis is completed, the electrolyte molten salt in the electrolytic tank is removed to obtain the Mg-Sr alloy formed by electrolysis. Its chemical composition is Sr 0.05%wt, and the total...

Embodiment 3

[0030] (1) Preparation of solid cathode: MgO157g, SrCO 3 10g of strontium carbonate ore with a content of 98% and 3.5g of calcium carbonate are crushed to 0.09-0.13mm, mixed evenly, compacted into a disc under a pressure of 35MPa, and then sintered to form a solid cathode;

[0031] (2) Preparation of electrolyte molten salt: 1Kg of CaCl with a mass ratio of 7:3 2 -NaCl mixture is fully dehydrated at 350°C, mixed evenly, added to the electrolytic tank, heated and melted to become electrolyte molten salt;

[0032] (3) Implement electrolysis: immerse the solid cathode in the molten salt; introduce the graphite anode into the molten salt, and the cathode conductor into the solid cathode; the electrolysis temperature is 750°C, and the working voltage of the electrolyzer is 3.0V; direct current electrolysis;

[0033] (4) Discharging: After the electrolysis is completed, the electrolyte molten salt in the electrolytic tank is removed to obtain the Mg-Sr alloy formed by electrolysis....

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Abstract

The invention relates to a method for preparing magnesium- strontium alloy by electrolyzing MgO and SrO in the same electrolyser, belonging to magnesium alloy preparation technique field. It is characterized in that it takes MgO and SrO as suply for alloy, metal halide as electrolyte, decodes magnesium and strontium with electrical deoxidation to get magnesium- strontium alloy, the temperature for electrolysis is 650- 850 Deg. C, and voltage is 2.5- 4.5 V. The invention takes MgO and SrO or precursor material as raw material, prepares magnesium- strontium alloy through electrolytic reduction. It is characterized by shortened process, environment- friendly, low production cost, good economic bebefit, and high- purity magnesium- strontium alloy with strontium content being 0.05-25%wt.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy material preparation, and in particular relates to a method for preparing magnesium-strontium alloy by electrolyzing MgO and SrO in the same tank. Background technique [0002] Adding 0.5-5% strontium to the magnesium alloy to achieve alloying can effectively refine the grains of the magnesium alloy and improve the alloy's high-temperature creep resistance and thermal cracking resistance. Mg-Sr series magnesium alloy, as a kind of heat-resistant magnesium alloy with excellent performance, is an ideal material for the manufacture of heat-resistant parts of lightweight vehicles. [0003] The existing methods for adding alloying element strontium to magnesium alloy to prepare magnesium-strontium alloy or magnesium-strontium master alloy are pair doping method and immersion reduction method. [0004] The Mg-Sr alloy is prepared by the pair-doping method, which is to mix metal magnesium and me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
Inventor 谢卫东汪守铖彭晓东
Owner CHONGQING UNIV
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