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Preparation method for abrasion resistant high-alumina brick of ferronickel rotary kiln

A technology of nickel-iron rotary kiln and production method, which is applied in the field of production of wear-resistant high-alumina bricks for nickel-iron rotary kiln, which can solve the problems of poor wear resistance, large porosity, and unsatisfactory service life, so as to improve wear resistance and thermal shock resistance, the effect of prolonging the service life

Inactive Publication Date: 2014-11-19
ZHENGZHOU DONGFANG CERAMIC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the refractories and configurations used in nickel-iron rotary kilns are basically borrowed from cement rotary kilns. However, there are great differences between cement materials and nickel-iron alloy smelting There are significant differences in the material state, smelting temperature, and material erosion ability, which lead to a short service life of nickel-iron rotary kiln refractories borrowed from cement kiln refractories, which seriously affects the operation and production of nickel-iron smelting cost
Especially the high-alumina bricks used in the preheating zone of the nickel-iron rotary kiln have a very unsatisfactory service life due to their large porosity and poor wear resistance.

Method used

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  • Preparation method for abrasion resistant high-alumina brick of ferronickel rotary kiln

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Experimental program
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Effect test

Embodiment 1

[0014] The manufacturing method of the wear-resistant high-alumina brick for nickel-iron rotary kiln according to the present invention is composed of 80% bauxite (60% of aggregate with a particle size of 0.5~5mm, 40% of fine powder with a particle size of ≥180 mesh), bonded clay 10% (particle size ≥ 180 mesh), silicon oxide micropowder 5% (particle size ≥ 300 mesh) and silicon carbide micropowder 5% (particle size 1000~1500 mesh), add lignin 3~6% of the total amount of materials for combination It is made by firing: firstly, all the materials are mixed evenly, then pressed into shape, dried at 110°C, and then fired at 1400°C for 8 hours to obtain wear-resistant high-alumina bricks for nickel-iron rotary kiln.

Embodiment 2

[0016] The manufacturing method of wear-resistant high-alumina bricks for nickel-iron rotary kiln according to the present invention is composed of 75% of bauxite (60% of aggregate with a particle size of 0.5~5mm, 40% of fine powder with a particle size of ≥180 mesh), bonded clay 10% (particle size ≥ 180 mesh), silicon oxide powder 7% (particle size ≥ 300 mesh) and silicon carbide powder 8% (particle size 1000~1500 mesh), add 3~6% of the total amount of lignin to combine It is made by firing: firstly, all the materials are mixed evenly, then pressed into shape, dried at 120°C, and then fired at 1450°C for 6 hours to obtain wear-resistant high-alumina bricks for nickel-iron rotary kiln.

Embodiment 3

[0018] The manufacturing method of the wear-resistant high-alumina brick for nickel-iron rotary kiln according to the present invention is composed of 70% of bauxite (60% of aggregate with a particle size of 0.5~5mm, 40% of fine powder with a particle size of ≥180 mesh), combined After mixing clay 15% (particle size ≥ 180 mesh), silica powder 8% (particle size ≥ 300 mesh) and silicon carbide powder 7% (particle size 1000-1500 mesh), add 3-6% of the total amount of lignin to make Binder firing: firstly mix all the materials evenly and then press into shape, dry at 180°C, and then fire at 1600°C for 2 hours to get wear-resistant high alumina bricks for nickel-iron rotary kiln.

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Abstract

The invention discloses a preparation method for an abrasion resistant high-alumina brick of a ferronickel rotary kiln. The preparation method comprises the following steps: weighing 70-90% of bauxite, 1-15% of bound clay, 1-10% of monox micro powder and 1-10% of silicon carbide micro powder of which the granularity is no less than 1000 meshes respectively; adding defined amount of lignose as a binding agent, and conducting mixing uniformly; pressing the materials for formation; drying at 60-200 DEG C; firing for 2-12 hours at 1300-1600 DEG C to obtain the finished brick body. The preparation method has the advantages that superfine SiC micro powder is applied in the raw materials; the SiC powder of which the granularity is not less than 1000 meshes is provided with high activity, can efficiently fill interspace in the brick body in a preparation process, and greatly improves density of the brick body; the SiC can be oxidized to generate active silicon oxidate at a high temperature; in-situ reaction is conducted on the sub-micron silicon oxidate and the alumina in the brick body to generate the needle-shaped mullite which fills the brick body in a staggered manner; abrasion resistance and thermal shock resistance of the high-alumina brick are greatly improved.

Description

technical field [0001] The invention relates to a refractory material for a nickel-iron rotary kiln, in particular to a method for manufacturing a wear-resistant high-alumina brick for a nickel-iron rotary kiln. Background technique [0002] At present, the refractory materials and configurations used in the nickel-iron rotary kiln are basically borrowed from the cement rotary kiln. However, the cement material is very different from the nickel-iron alloy smelting process. The material state, smelting temperature, and material erosion ability have different There is a major difference, which leads to a shorter service life of the ferronickel rotary kiln refractories borrowed from cement kiln refractories, which seriously affects the operation and production costs of ferronickel smelting. Especially the high-alumina bricks used in the preheating zone of the nickel-iron rotary kiln have a very unsatisfactory service life due to their large porosity and poor wear resistance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 周栋浩周栋洋肖继东周海亭
Owner ZHENGZHOU DONGFANG CERAMIC ENG