A kind of preparation method of high temperature resistant forsterite type refractory material

An olivine-type and refractory technology is applied to the preparation of high-temperature-resistant forsterite-type refractories, and the use of nickel-iron slag to prepare high-temperature-resistant forsterite-type refractories can solve the problem of long production time, unsatisfactory performance, Issues such as restricting applications

Active Publication Date: 2020-09-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method makes good use of the composition and phase characteristics of ferronickel slag. The dosage of ferronickel slag can reach 75%, and the resource utilization rate is high. Long, compressive strength is only 5.5 ~ 8.5MPa, load softening point ≤ 1380 ℃, its performance can not meet the practical application
[0008] Patent CN106810281A discloses a preparation method of forsterite refractory bricks prepared by using ferronickel slag, using ferronickel slag and magnesia as raw materials, adding water and binder, and adjusting the mass ratio of each component, in the range of 1200~ The forsterite refractory material is obtained by roasting at 1350°C for 2-3.5 hours. This method has good controllability, simple process, low production cost, high resource utilization rate, and environmental friendliness. The prepared material has high compressive strength, but its refractoriness is ≤ 1680°C, which still greatly limits its application under high-temperature ring mirrors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Mix nickel-iron slag, magnesia fine powder, and magnesium chloride solution evenly, press to form under 32KN pressure, and dry; after treatment, roast at 1360°C for 110min in an air atmosphere to obtain forsterite-type refractories.

[0083] After mixing evenly, the relationship between the components of the mixture is:

[0084] [w(MgO)+w(FeO)] / [w(Al 2 o 3 )+w(Cr 2 o 3 )]=10.97,

[0085] w(MgO) / w(Cr 2 o 3 ) = 40.69,

[0086] W(MgO)=[1.03w n (SiO 2 )~w n (MgO)] / w m (MgO),

[0087] w(MgO) / w(SiO 2 ) = 1.38.

[0088] The particle size of the ferronickel slag is 86% smaller than 0.074mm.

[0089] The particle size of the magnesia is 89% smaller than 0.074mm.

[0090] The added amount of the magnesium chloride solution is 4.5wt% of the ferronickel slag.

[0091] The concentration of described magnesium chloride solution is 1.25g / cm 3 .

[0092] Forsterite-type refractories prepared by using ferronickel slag in this example 1: the refractoriness is 1730-1780°...

Embodiment 2

[0094] Mix ferronickel slag, magnesia fine powder, and magnesium chloride solution evenly, press and form under 30KN pressure, and dry; after treatment, roast at 1400°C for 60 minutes in an air atmosphere to obtain forsterite-type refractories.

[0095] After mixing evenly, the relationship between the components of the mixture is:

[0096] [w(MgO)+w(FeO)] / [w(Al 2 o 3 )+w(Cr 2 o 3 )]=10.97,

[0097] w(MgO) / w(Cr 2 o 3 ) = 40.69,

[0098] w(MgO) / w(SiO 2 ) = 1.38.

[0099] The particle size of the ferronickel slag is 89% smaller than 0.074mm.

[0100] The particle size of the magnesia is 92% smaller than 0.074mm.

[0101] The added amount of the magnesium chloride solution is 5.5wt% of the ferronickel slag.

[0102] The concentration of described magnesium chloride solution is 1.3g / cm 3 .

[0103] Forsterite-type refractories prepared by using ferronickel slag in Example 2: the refractoriness is 1700-1750°C, the compressive strength is 77.38-80.61Mpa, and the bulk de...

Embodiment 3

[0105] Mix ferronickel slag, magnesia fine powder, and magnesium chloride solution evenly, press to form under 30KN pressure, and dry; after treatment, roast at 1450°C for 75 minutes in an air atmosphere to obtain forsterite-type refractories.

[0106] After mixing evenly, the relationship between the components of the mixture is:

[0107] [w(MgO)+w(FeO)] / [w(Al 2 o 3 )+w(Cr 2 o 3 )]=12.62;

[0108] w(MgO) / w(Cr 2 o 3 ) = 44.39,

[0109] w(MgO) / w(SiO 2 ) = 1.50.

[0110] The particle size of the ferronickel slag is 86% smaller than 0.074mm.

[0111] The particle size of the magnesia is 89% smaller than 0.074mm.

[0112] The added amount of the magnesium chloride solution is 5.5wt% of the ferronickel slag.

[0113] The concentration of described magnesium chloride solution is 1.2g / cm 3 .

[0114] Forsterite-type refractories prepared by using ferronickel slag in Example 3: the refractoriness is 1720-1770°C, the compressive strength is 129.11-132.54Mpa, and the bulk d...

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Abstract

The invention discloses a preparation method of a high temperature resistant forsterite type refractory material. The method comprises the following steps: using nickel-iron slag as raw materials and magnesia powder as additives, wherein the ratio of [w (MgO) + w (FeO)] to [w (Al2O3)+w (Cr2O3)] is 10.50 to 13.57, the ratio of w (MgO) to w (Cr2O3) is 34.90 to 48.12 and the ratio of w (MgO) to w (SiO2) is 1.19 to 1.61, adding binding agents and controlling calcination temperature to be 1360 DEG C to 1450 DEG C, inducing mineral phase reconstruction of the nickel-iron slag, optimizing transformation process of refractory crystal form (Mg2SiO4, MgO.Fe2O3, MgO.Al2O3, MgO.Cr2O3) to increase refractoriness of the refractory material. The refractoriness of the obtained refractory material is 1700 to 1800 DEG C, and the refractory material also has the advantages of high compressive strength, large bulk density, low apparent porosity, and can fully meet the industrial need of the refractory material. The preparation method of the high temperature resistant forsterite type refractory material has the advantages of high utilization rate of resources, high production efficiency, high added value, environment friendliness, easiness in process control, low production cost and the like.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a method for preparing a high-temperature-resistant forsterite-type refractory material, in particular to a method for preparing a high-temperature-resistant forsterite-type refractory material by using ferronickel slag. Background technique [0002] Pure forsterite theoretically consists of 57.1% MgO and 42.9% SiO 2 Composition, the ratio of magnesium to silicon is 1.33. Forsterite is MgO~SiO 2 The most stable refractory phase in the system, the melting point is generally 1890 °C, and its crystal structure is orthorhombic, in which silicon-oxygen tetrahedrons are isolated and composed of magnesium ions connected in the form of magnesium-oxygen octahedrons, Mg-O bonds and There is a strong bond energy between Si~O bonds, so the overall structure of forsterite is relatively stable. Forsterite-type refractories are based on forsterite (Mg 2 SiO 4 ) as the main c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
CPCC04B35/62204C04B35/66C04B2235/3206
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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