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Method for preparing magnesium-calcium alloy through aluminothermic reduction

A magnesium-calcium alloy and thermite technology, applied in the field of metallurgy, can solve the problems of short process, intense secondary reaction, unsuitable collection of products and product purity, and achieve the effects of low cost, high production efficiency and high product purity

Active Publication Date: 2016-04-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has a short process and less residue, there are also problems such as relatively violent secondary reactions, unsuitable collection of products and low product purity.

Method used

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  • Method for preparing magnesium-calcium alloy through aluminothermic reduction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method for producing magnesium-calcium alloy through thermite reduction comprises the following steps:

[0027] Step 1, MgO powder with a particle size of 61 μm, CaO powder with a particle size of 61 μm and Al powder with a particle size of 175 μm, MgO powder: CaO powder: Al powder=100:87:46 are mixed evenly by mass ratio;

[0028] Step 2, using a press to press the mixed material into an agglomerate with a thickness of about 4mm under a pressure of 100MPa;

[0029] Step 3, put the agglomerate into the reduction tank and vacuumize to 1Pa, then keep the reduction tank at 1150°C for 6 hours to reduce magnesium oxide and calcium oxide into magnesium vapor and calcium vapor;

[0030] Step 4, after the magnesium vapor and the calcium vapor are condensed, a magnesium-calcium alloy with a calcium content of 2.5-3.5wt.% is obtained in the crystallizer.

[0031] The process flow chart of the method for producing magnesium-calcium alloy by thermite reduction of the present e...

Embodiment 2

[0033] The method for producing magnesium-calcium alloy through thermite reduction comprises the following steps:

[0034] Step 1, select the MgO powder with a particle size of 74 μm, the CaO powder of 74 μm and the Al powder of 125 μm, and mix evenly by mass ratio as MgO powder: CaO powder: Al powder=100:96:48;

[0035] Step 2, using a press to press the mixed material into an agglomerate with a thickness of about 6mm under a pressure of 80MPa;

[0036] Step 3, put the agglomerate into the reduction tank and vacuumize to 4Pa, then keep the reduction tank at 1200°C for 5 hours to reduce magnesium oxide and calcium oxide into magnesium vapor and calcium vapor;

[0037] Step 4, after the magnesium vapor and calcium vapor are condensed, a magnesium-calcium alloy with a calcium content of 5-7 wt.% is obtained in a crystallizer.

[0038] The process flow chart of the method for producing magnesium-calcium alloy by thermite reduction of the present embodiment is shown in figure 1 ...

Embodiment 3

[0040] The method for producing magnesium-calcium alloy through thermite reduction comprises the following steps:

[0041] Step 1, select MgO powder with particle size of 104 μm, CaO powder of 104 μm and Al powder of 96 μm, mix MgO powder: CaO powder: Al powder=100:103:50 by mass ratio;

[0042] Step 2, using a press to press the mixed material into an agglomerate with a thickness of about 8mm under a pressure of 60MPa;

[0043] Step 3, put the agglomerate into the reduction tank and vacuumize to 7Pa, then keep the reduction tank at 1250°C for 4 hours to reduce magnesium oxide and calcium oxide into magnesium vapor and calcium vapor;

[0044] Step 4, after the magnesium vapor and the calcium vapor are condensed, a magnesium-calcium alloy with a calcium content of 7.5-10.5 wt.% is obtained in the crystallizer.

[0045] The process flow chart of the method for producing magnesium-calcium alloy by thermite reduction of the present embodiment is shown in figure 1 .

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Abstract

The invention relates to a method for preparing a magnesium-calcium alloy through aluminothermic reduction. The method includes the following steps that (1) MgO powder, CaO powder and Al powder are evenly mixed; (2) a mixed material is pressed into chunks; (3) the chunks are placed into a reduction pot, the reduction pot is vacuumized, heat preservation is carried out on the reduction pot for 3 h to 6 h at the temperature ranging from 1150 DEG C to 1300 DEG C, and magnesium oxide and calcium oxide are restored into magnesium steam and calcium steam; and (4) after the magnesium steam and the calcium steam are congealed, and the magnesium-calcium alloy is generated in a crystallizer. According to the method for preparing the magnesium-calcium alloy through aluminothermic reduction, the magnesium oxide and the calcium oxide serve as raw materials, aluminite powder serves as a reduction agent, and the magnesium-calcium alloy is obtained through one step of vacuum heat reduction, so that the problem of burning losses formed by a doping method is solved, the production efficiency is high, the cost is low, the environment is good, the product purity is high, and produced waste residues can be fully used for producing high-strength cement or used for extracting aluminum hydroxide.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a method for preparing a magnesium-calcium alloy through aluminothermic reduction. Background technique [0002] Calcium is an alloying element of magnesium alloy, which can refine the structure of magnesium alloy and improve the creep resistance. Magnesium-calcium alloy itself can not only be used as a heat-resistant alloy, but also can be used in large quantities as nodularizers for the production of ductile iron, desulfurizers and deoxidizers for steelmaking. Especially for some low-silicon or silicon-free steel types, the magnesium-calcium alloy has a more prominent effect on the deep deoxidation of molten steel and the denaturation treatment of inclusions. In addition, magnesium-calcium alloys have low density, high elastic modulus, strong corrosion resistance, and good biocompatibility with the human body. Therefore, magnesium-calcium alloys have gradually attracted people's atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22B5/04C22C23/00
CPCC22B5/04C22C1/02C22C23/00Y02P10/20
Inventor 罗洪杰吴林丽张志刚刘宜汉徐建荣郭清富
Owner NORTHEASTERN UNIV
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