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Method for preparing high-level refractory material through ferronickel smelting slag

A technology for smelting slag and refractory materials of ferronickel, applied in the field of refractory materials, can solve problems such as strength reduction, and achieve the effects of low production cost, high compressive strength and good stability

Active Publication Date: 2018-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, when trying to apply it to an environment of 1800°C, the strength drops dramatically!

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The ferronickel smelting slag, magnesia, and chromium trioxide were finely ground for 80 minutes in a planetary ball mill at a rotation speed of 600r / min, a revolution speed of 80r / min, and a ball-to-material ratio of 8:1 to obtain a fine-grained grade. The mixed material, wherein the mass of particles with a particle size of less than 0.074 mm in the mixed material accounts for 95% or more of the total mass of the mixed material.

[0055] Wherein, the addition of magnesia is 25wt% of the quality of nickel-iron smelting slag, and the addition of dichromium trioxide is 6wt% of the quality of nickel-iron smelting slag, so that in the mixed material, the mass ratio relationship of each component is:

[0056] w(MgO) / w(SiO 2 ) = 1.38,

[0057] w(MgO) / w(Cr 2 o 3 )=7.07.

[0058] Then add magnesium chloride solution and mix evenly, press molding under 100MPa pressure, and dry treatment; after treatment, sinter at 1350°C for 3 hours, and the high-grade refractory material c...

Embodiment 2

[0063] Ferronickel smelting slag, magnesia, and chromium trioxide were finely ground for 80 minutes in a planetary ball mill at a rotation speed of 300r / min, a revolution speed of 50r / min, and a ball-to-material ratio of 5:1 to obtain a fine-grained grade. The mixed material, wherein the mass of particles with a particle size of less than 0.074 mm in the mixed material accounts for 95% or more of the total mass of the mixed material.

[0064] Wherein, the addition of magnesia is 30wt% of the quality of nickel-iron smelting slag, and the addition of dichromium trioxide is 4wt% of the quality of nickel-iron smelting slag, so that in the mixed material, the mass ratio relationship of each component is:

[0065] w(MgO) / w(SiO 2 ) = 1.37,

[0066] w(MgO) / w(Cr 2 o 3 ) = 12.20.

[0067] Then add magnesium chloride solution and mix evenly, press molding under 90MPa pressure, and dry treatment; after treatment, sinter at 1350°C for 2.5h, and the high-grade refractory material can be...

Embodiment 3

[0072] The ferronickel smelting slag, magnesia, and chromium oxide were finely ground for 60 minutes in a planetary ball mill at a rotation speed of 500r / min, a revolution speed of 70r / min, and a ball-to-material ratio of 6:1 to obtain a fine-grained grade. The mixed material, wherein the mass of particles with a particle size of less than 0.074 mm in the mixed material accounts for 95% or more of the total mass of the mixed material.

[0073] Wherein, the addition of magnesia is 20wt% of the quality of nickel-iron smelting slag, and the addition of dichromium trioxide is 8wt% of the quality of nickel-iron smelting slag, so that in the mixed material, the mass ratio relationship of each component is:

[0074] w(MgO) / w(SiO 2 ) = 1.40,

[0075] w(MgO) / w(Cr 2 o 3 ) = 6.02.

[0076] Then add magnesium chloride solution and mix evenly, press molding under 100MPa pressure, and dry treatment; after treatment, sinter at 1300°C for 3 hours, and the high-grade refractory material ca...

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Abstract

A method for preparing a high-level refractory material through ferronickel smelting slag comprises the following steps: mixing ferronickel smelting slag, magnesite and chromic oxide; performing ballmilling to obtain fine-sized uniform mixture; synchronously adjusting and controlling to realize w(MgO) / w(SiO2)=1.37-1.40 and w(MgO) / w(Cr2O3)=6.02-12.20 in the uniform mixture; additionally adding a binding agent; controlling the sintering temperature of 1200-1500 DEG C; inducing phase and structure transformation of ferronickel smelting slag; and optimizing the refractory phase (Mg2SiO4, [Fe, Mg][Cr, Fe]2O4) crystal transformation to realize directional phase and structure transformation, thus obtaining the refractory material with high crystalizing performance and dense structure. The refractory material is high in refractoriness and compressive strength; the refractoriness is up to 1800-1860 degrees; in addition, the refractory material has the advantages of being high in compressive strength, high in volume density, and low in apparent porosity; the industrial demands on the refractory material can be completely met. The method has the advantages of being high in resource utilization rate, high in production efficiency, high in added value of product, environmentally friendly, easy to control processes, and low in production cost.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a method for preparing high-grade refractory materials by utilizing ferronickel smelting slag. Background technique [0002] Pre-reduction-electric furnace method (RKEF) is the mainstream process for producing ferronickel from laterite nickel ore in the world today. According to incomplete statistics, the accumulative stockpile of laterite nickel ore smelting slag in my country exceeds 100 million tons, and continues to increase at a rate of more than 12 million tons per year. A large amount of stockpiling of ferronickel slag occupies land, pollutes air and water sources, and its potential environmental hazards are serious. Compared with ordinary iron and steel metallurgical slag, ferronickel smelting slag has more complex chemical composition, high content of magnesium oxide and silicon oxide (the two content accounts for about 80%), and contains ferrous oxide (5...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/20C04B35/622C04B35/64
CPCC04B35/20C04B35/62204C04B35/64C04B35/66C04B2235/3241C04B2235/6583C04B2235/77
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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