Method for preparing silicon-aluminum-iron alloy containing nano-particles by using nano-molten salt

A nanoparticle and ferroalloy technology, applied in the direction of improving process efficiency, can solve the problems of increasing the production cost and preparation cost of nanoparticle-containing steel, and achieve the effect of increasing added value and reducing production cost.

Active Publication Date: 2019-04-05
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] The key to the successful implementation of the pre-dispersion method lies in the low cost of the dispersion medium and dispersion preparation and the fact that it does not pollute the molten steel itself. However, due to the high cost of preparation of the alloy powder used as the dispersion medium, and the complex processing required for the composite with nanoparticles, further improved The production cost of nanoparticle-containing steel, how to develop low-cost nanoparticle-containing master alloy has become a key issue in the production of nanoparticle steel

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  • Method for preparing silicon-aluminum-iron alloy containing nano-particles by using nano-molten salt

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Mechanically mix titanium carbide nanoparticles with a particle size of 30-50 nanometers with salt, the composition of which is: NaCl: 15%, KCl: 15%, NaCl 3 AlF 6 : 70%, the weight of titanium carbide nanoparticles is 0.25 of the salt, the mixed nanoparticle-containing salt and the acetone liquid whose mass is 4 times that of the nanoparticle-containing salt are added to the ultrasonic vibrator, and after ultrasonic vibration treatment for 2 hours, the dispersed The acetone solution in which the nanoparticles are distributed is placed in a vacuum drying oven and heated in a vacuum with a vacuum degree of 0.06 MPa and a vacuum heating temperature of 190°C; heat treatment in vacuum for 2 hours to obtain a mixed salt in which the nanoparticles and the salt are evenly distributed. Add scrap steel, No. 75 ferrosilicon, aluminum ingots in sequence, and then add the latter material after the former material is melted. After the alloy is completely melted, add mixed salt and li...

Embodiment 2

[0027] Mechanically mix titanium nitride nanoparticles with a particle size of 40-70 nanometers and salt, the composition of the salt is: NaCl: 17%, KCl: 19%, Na3AlF6: 64%; the weight of titanium nitride nanoparticles is the salt 0.3, add the mixed nanoparticle-containing salt and the acetone liquid whose mass is 5 times that of the nanoparticle-containing salt into the ultrasonic vibrator, and after ultrasonic vibration treatment for 2.5 hours, put the acetone solution with dispersed nanoparticles into a vacuum drying oven Vacuum heating in medium, the vacuum degree is 0.07 MPa, and the vacuum heating temperature is 170°C; after vacuum heating for 1.8 hours, a mixed salt with uniform distribution of nanoparticles and salt is obtained; in the induction furnace, scrap steel, No. 75 ferrosilicon, For aluminum ingots, add the latter material after the former material is melted. After the alloy is completely melted, add mixed salt containing nanoparticles and lime; the weights of ...

Embodiment 3

[0029] Mechanically mix the zirconium boride nanoparticles with a particle size of 40-80 nanometers and the salt, the composition of the salt is: NaCl: 20%, KCl: 18%, Na3AlF6: 62%, and the weight of the zirconium boride nanoparticles is the salt 0.32; the mixed nanoparticle-containing salt and the acetone liquid whose mass is 6 times that of the nanoparticle-containing salt are added to the ultrasonic vibrator, and after ultrasonic vibration treatment for 2.3 hours, the acetone solution with dispersed nanoparticles is put into a vacuum drying oven Medium vacuum heating, the vacuum degree is 0.04 MPa, and the vacuum heating temperature is 160°C; the vacuum heating treatment is completed after 1.5 hours, and the mixed salt with uniform distribution of nanoparticles and salt is obtained; scrap steel and No. 75 ferrosilicon are sequentially added into the induction furnace , aluminum ingots, after the former material is melted, add the latter material; after the alloy is completely...

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Abstract

The invention provides a method for preparing silicon-aluminum-iron alloy containing containing nano-particles by using nano-molten salt, and belongs to the field of special ferroalloy production. Themethod comprises the steps that step one, mixed salt containing the nano-particles is prepared, that is, the nano-particles are mechanically mixed with the salt and then acetone liquid is added, vacuum-pumping and heating are carried out in a vacuum drying oven after ultrasonic vibration treatment, and the acetone is completely volatilized to obtain evenly mixed salt containing the nano-particles; and step two, the silicon-aluminum-iron alloy containing the nano-particles is smelted in an induction furnace, that is, scrap steel, seventy-fifth silicon iron, aluminum ingot, mixed salt containing the nano-particles and lime are sequentially added in an medium frequency induction furnace, the scrap steel, the seventy-fifth silicon iron, the aluminum ingot, the mixed salt containing the nano-particles and the lime are melted, keeping warm, stopping heating and standing are carried out, the silicon-aluminum-iron alloy containing the nano-particles is obtained by cast molding. According to the method, the nano-particles are added in the production process of silicon-aluminum-iron alloy to obtain the silicon-aluminum-iron alloy with even distribution of the nano-particles, and intermediate alloy is provided for preparing nano-particle containing steel at low cost.

Description

technical field [0001] The invention relates to the technical field of ferroalloy preparation, in particular to a method for preparing nanoparticle-containing silicon-aluminum-iron alloys by using nanometer molten salt. Background technique [0002] Silicon-aluminum ferroalloy is a deoxidizer used in steelmaking production. It improves the shape of inclusions and reduces the content of gas elements in molten steel. It is an effective new technology to improve steel quality, reduce costs, and save aluminum. The production of ferro-silicon alloy mainly adopts the blending method of steel scrap, ferrosilicon and aluminum ingot, and the electrothermal reduction method of ore and carbonaceous reducing agent. [0003] Adding nanoparticles to molten steel can increase the nucleation rate and refine the grains, thereby improving its solidification structure and optimizing the comprehensive mechanical properties of steel. At present, the addition methods of nanoparticles in steel ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/00C22C21/02C22C32/00C22C30/00C22C33/06C22C38/02C22C38/06C21C7/06
CPCC21C7/06C22C1/026C22C1/03C22C21/00C22C21/02C22C30/00C22C32/0052C22C32/0068C22C32/0073C22C33/06C22C38/02C22C38/06Y02P10/20
Inventor 肖赛君金维亮钟聪章俊顾宇
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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