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Refining method for removing aluminum from crude magnesium and flux for refining crude magnesium

A technology of flux and molten salt, used in the field of crude magnesium removal and refining flux, can solve the problems of high mechanical strength, excessive aluminum content, affecting the quality of sponge titanium products, etc., and achieve the effect of high efficiency and short cycle.

Inactive Publication Date: 2016-01-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, as far as a sponge titanium factory is concerned, the aluminum content in the refined magnesium obtained after refining its crude magnesium often exceeds the standard, which seriously affects the quality of sponge titanium products, and the method of adding Ti, Zr, Mn and other elements is adopted Removing Al in crude magnesium has problems such as long production cycle, high mechanical strength, and easy occurrence of new pollution, which greatly increases the refining cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Select a magnesium refining furnace in a factory, and its flux composition is 40%KCl, 25%MgCl 2 , 30%NaCl and 5%CaCl 2 , add sodium oxide powder with a mass fraction of 2% to it, stir to make it fully dissolve, add 5t of crude magnesium with an aluminum content of 0.12% to refine and clarify for 30 minutes, and take a sample to analyze that the aluminum content in the refined magnesium is 0.004%, which completely reaches the first-grade magnesium The standard requires that the aluminum content is ≤0.006, and the purification efficiency η is: η=(0.12-0.004) / 0.12×100%=96.6%.

example 2

[0034] Select a magnesium refining furnace in a factory, and its flux composition is 25%KCl, 50%MgCl 2 , 15%NaCl and 10%CaCl 2 , add potassium oxide powder with a mass fraction of 3% to it, stir to make it fully dissolved, add 5t of crude magnesium with an aluminum content of 0.15% to refine and clarify for 30 minutes, and take a sample to analyze that the aluminum content in the refined magnesium is 0.006%, reaching the first-grade magnesium standard If the aluminum content is ≤0.006, the purification efficiency η is: η=(0.15-0.006) / 0.15×100%=96%.

example 3

[0036] Select a magnesium refining furnace in a factory, the flux composition is 40%KCl, 38%MgCl 2 , 10%NaCl, 10%CaCl 2 and 2%CaF 2 , adding mass fraction therein is 2% potassium oxide and 1% sodium oxide powder, after stirring to make it fully dissolved, adding 5t of crude magnesium with an aluminum content of 0.09% is refined and clarified for 45 minutes, and the aluminum content in the refined magnesium is 0.005% by sampling analysis. Meet the requirements of the aluminum content ≤ 0.006 in the first-class magnesium standard, and the purification rate efficiency η is: η=(0.09-0.005) / 0.09×100%=94.4%.

[0037] To sum up, the present invention can realize the effective purification of aluminum in crude magnesium (for example, the purification rate efficiency η can reach more than 94%) without causing the loss of metallic magnesium and not affecting the refining cycle.

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Abstract

The invention provides a rough magnesium aluminum-removal refining method and a rough magnesium aluminum-removal refining flux. The method comprises the following steps: melting a refining flux base body, wherein the refining flux base body comprises the ingredients by weight percent: 15 to 40 percent of KCl and 5 to 50 percent of MgCl2; dissolving Na2O and / or K2O into the refining flux base body; adding a rough magnesium raw material into the refining flux base body with dissolved Na2O and / or K2O to be refined; precipitating and settling the solution after the refining is ended to obtain the refined metal magnesium. The rough magnesium aluminum-removal refining method has the advantages that the refining flux and the refining method, which are suitable for refining the rough magnesium and removing the aluminum, can be provided; moreover, the loss of the magnesium is avoided under the situation that the aluminum impurity in the rough magnesium is effectively removed; moreover, the period is short, and the efficiency is high.

Description

technical field [0001] The invention relates to the technical field of refining magnesium by removing aluminum from crude magnesium, in particular to a method for refining crude magnesium by removing aluminum and a flux for refining crude magnesium by removing aluminum. Background technique [0002] As we all know, magnesium is the third type of metal structural material developed after steel and aluminum alloys. It is widely used and is known as the green engineering material of the 21st century. At present, magnesium production mainly includes electrolysis method and Pidgeon method (silicon thermal reduction method). The advantages of simple process, continuous production, and high degree of automation are widely used, especially suitable for the chlorine-magnesium cycle of the entire system of the sponge titanium production complex. [0003] However, generally speaking, the electrolyzed magnesium is crude magnesium, which often contains certain impurity elements. For exa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/10C22B26/22
Inventor 朱福兴程晓哲马尚润陈斌李开华穆天柱邓兵张瑶
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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