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A kind of method for preparing forsterite type refractory material by microwave heating

An olivine-type, refractory technology, applied in the field of microwave metallurgy and refractory materials, can solve the problems of long roasting time and poor thermal shock resistance, and achieve the effects of shortening sintering time, high compressive strength and excellent bulk density

Active Publication Date: 2020-09-29
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 the nickel-iron slag with the particle size of -200 mesh, the magnesia powder with the particle size of -300 mesh, and the magnesium chloride solution, and place the mixture in a stainless steel cylindrical mold with an inner diameter of 10 mm, and apply it on the SBY-30 manual hydraulic sample maker. Pressure of 100MPa, the density obtained is 2.08g / cm 3 The 10mm×10mm cylindrical body is dried at 110°C for 6 hours and then placed in a microwave reactor. The microwave frequency is set to 2450MHz. The temperature is raised to 1000°C at a rate of 20°C / min, and then 8 The temperature is increased to 1340°C and the temperature is kept and roasted for 20 minutes at a rate of ℃ / min to obtain forsterite type refractory; the roasting atmosphere is an air atmosphere, and the addition amount of the magnesia is 25wt% of the mass of the nickel-iron slag; the magnesium chloride solution The concentration is 1.35 mol / L, and the addition amount of the magnesium chloride solution is ...

Embodiment 2

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

Embodiment 3

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

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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 specifically relates to a method for preparing forsterite type refractories by microwave heating. Background technique [0002] Every 1 ton of nickel produced will produce 6-16 tons of nickel slag. In recent years, with the gradual expansion of the scale of pyrometallurgical smelting of laterite nickel ore, the annual production of nickel-iron smelting slag in my country has reached 4 million tons, and it is increasing year by year. . Since the main components of nickel-iron slag are magnesium, silicon, and also contain Fe, Mg, Ni and a small amount of heavy metal elements, the composition is complex, has a typical oxide slag phase structure, and it is difficult to recycle. Therefore, the current utilization rate of nickel slag is only About 10%, it has gradually become a major problem in metallurgical waste disposal. [0003] At present, the processing methods of ferron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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