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Method for preparing forsterite refractory material through microwave heating

An olivine-type, refractory technology, applied in the field of microwave metallurgy and refractory materials, can solve the problems of poor thermal shock resistance, long roasting time, etc., achieve high compressive strength, shorten sintering time, and broaden the scope of application.

Active Publication Date: 2017-10-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of long roasting time and poor thermal shock resistance of forsterite-type refractory materials in the prior art, the present invention aims to provide a method for preparing forsterite-type refractory materials by microwave heating that can speed up the reaction process and greatly shorten the sintering time Methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Mix ferronickel slag with a particle size of -200 mesh, magnesia powder with a particle size of -300 mesh, and magnesium chloride solution, and then place the mixture in a stainless steel cylindrical mold with an inner diameter of 10mm. On the SBY-30 manual hydraulic sample making machine, apply 100MPa pressure, the obtained density is 2.08g / cm 3 The 10mm×10mm cylindrical body was dried at 110°C for 6 hours and then placed in a microwave reactor. The microwave frequency was set at 2450MHz, and the temperature was raised to 1000°C at a rate of 20°C / min, and then heated at 8°C. The speed of ℃ / min is heated to 1340 ℃ and roasted for 20 minutes to obtain a forsterite type refractory material; the roasting atmosphere is an air atmosphere, and the amount of magnesia added is 25wt% of the mass of ferronickel slag; the magnesium chloride solution The concentration is 1.35mol / L, and the added amount of the magnesium chloride solution is 5.4wt% of the sum of the mass of ferronick...

Embodiment 2

[0071] Mix ferronickel slag with a particle size of -180 mesh, magnesia powder with a particle size of -300 mesh, and magnesium chloride solution, and then place the mixture in a stainless steel cylindrical mold with an inner diameter of 10mm. On the SBY-30 manual hydraulic sample making machine, apply 100MPa pressure, the obtained density is 2.04g / cm 3 The 10mm×10mm cylindrical green body was dried at 110°C for 6 hours and then placed in a microwave reactor. The microwave frequency was set to 2450MHz, and the temperature was raised to 1000°C at a speed of 17°C / min, and then heated at a temperature of 6 The speed of ℃ / min is heated to 1340 ℃ and roasted for 10 minutes to obtain a forsterite-type refractory material; the roasting atmosphere is an air atmosphere, and the amount of magnesia added is 25wt% of the mass of ferronickel slag; the magnesium chloride solution The concentration is 1.3mol / L, and the added amount of the magnesium chloride solution is 5wt% of the sum of the...

Embodiment 3

[0074] Mix ferronickel slag with a particle size of -200 mesh, magnesia powder with a particle size of -300 mesh, and magnesium chloride solution, and then place the mixture in a stainless steel cylindrical mold with an inner diameter of 10mm. On the SBY-30 manual hydraulic sample making machine, apply 100MPa pressure, the obtained density is 2.08g / cm 3 The 10mm×10mm cylindrical green body was dried at 105°C for 8 hours and then placed in a microwave reactor. The microwave frequency was set to 2450MHz, and the temperature was raised to 1000°C at a rate of 22°C / min, and then heated at a rate of 7°C. The speed of ℃ / min is heated to 1340 ℃ and roasted for 30 minutes, and the forsterite type refractory material is obtained; the roasting atmosphere is an air atmosphere, and the amount of magnesia added is 20wt% of the mass of ferronickel slag; the magnesium chloride solution The concentration is 1.32mol / L, and the added amount of the magnesium chloride solution is 5wt% of the sum o...

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Abstract

The invention relates to a method for preparing forsterite refractory material through microwave heating. The method includes: well mixing nickel-iron slag, magnesia powder and a binder, press-shaping to obtain a blank, putting the blank after being dried into a microwave reactor, and holding temperature of 1250-1340 DEG C for calcining for 10-60min to obtain a forsterite refractory material; according to formula composition, regulating and controlling a gradient temperature increase program of the microwave heating process to optimize phase transformation of the nickel-iron slag and grain growth process of the refractory material; combining with grain ratio of the nickel-iron slag and the magnesia powder, and accurately controlling porosity of the forsterite refractory material to finally obtain the forsterite refractory material which has high compressive strength and excellent thermal shock resistance. The method has the advantages of high sintering speed, low energy consumption, high production efficiency, high resource utilization rate, environment friendliness and excellent material performance and has good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of microwave metallurgy and refractory materials, and in particular relates to a method for preparing forsterite-type refractory materials by microwave heating. Background technique [0002] Every ton of nickel produced will produce 6-16 tons of nickel slag. In recent years, with the gradual expansion of the scale of ferronickel smelting by pyrometallurgy of laterite nickel ore, the annual production of ferronickel smelting slag in my country has reached 4 million tons, and it is increasing year by year. . Since the main components of ferronickel slag are magnesium and silicon, and also contain Fe, Mg, Ni and a small amount of heavy metal elements, the composition is complex, it has a typical oxide slag phase structure, and it is difficult to recycle. It is about 10%, and it has gradually become a major problem in the treatment of metallurgical waste residue. [0003] At present, the treatment methods of ferronickel ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622C04B35/64
CPCC04B35/62204C04B35/64C04B35/66C04B2235/3206C04B2235/667
Inventor 彭志伟李光辉姜涛古佛全张元波饶明军林小龙颜加兴李志忠唐慧敏范晓慧郭宇峰杨永斌李骞徐斌杨凌志易凌云
Owner CENT SOUTH UNIV
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