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A castable for sintering machine support bracket and its preparation and use method

A technology for supporting brackets and castables, which is applied in the field of castables for sintering machine supporting brackets and its preparation, can solve the problems of unsatisfactory continuous production operations of sintering machines, cost control, unbreakable brackets, and low service life. The effect of long service life and long life

Active Publication Date: 2016-02-10
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material of the bracket is all made of Cr-based heat-resistant steel. During use, there are problems such as low service life, high cost, staining, and inability to break the bracket if it falls off. It cannot meet the requirements of continuous production operations and cost control of the sintering machine.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A castable material used for the support frame of a sintering machine is formed by mixing a repairing material base material and an additive. The weight ratio of the castable base material is 85% mullite, 10% corundum, and 5% silicon dioxide powder. The additives are based on the total weight of the castable base material (100%), and include 0.4% of sodium tripolyphosphate or 0.4% of sodium hexametaphosphate, and 0.2% of organic fibers. Among them, the mass ratio of 1-3 mm mullite particles to mullite fine powder with a particle size of <0.088 mm is 2, and the mass ratio of corundum particles with a particle size of 0.1 to 1 mm to the fine corundum powder with a particle size of <0.080 mm is 0.8.

[0029] Its physical and chemical indicators: compressive strength (110℃×24h)≥30Mpa, compressive strength (1500℃×3h)≥67Mpa; bulk density (110℃×24h)≥2.75g / cm 3 ,Bulk density (1500℃×3h)≥2.7g / cm 3 , The linear change after firing (1500℃×3h) is ±0.12%.

[0030] The preparation method o...

Embodiment 2

[0035] A castable material used for a support frame of a sintering machine is formed by mixing a repairing material base material and an additive. The weight ratio of the castable base material is 87% mullite, 7% corundum, and 6% silicon dioxide powder. The additive is based on the total weight of the castable base material (100%), and is composed of 0.3% of sodium tripolyphosphate or 0.3% of sodium hexametaphosphate, and 0.2% of organic fibers. Among them, the mass ratio of 1-3 mm mullite particles to mullite fine powder with a particle size of <0.088 mm is 1.9, and the mass ratio of corundum particles with a particle size of 0.1 to 1 mm to the corundum fine powder with a particle size of <0.080 mm is 0.7.

[0036] Its physical and chemical indexes: compressive strength (110℃×24h)≥31Mpa, compressive strength (1500℃×3h)≥69Mpa; bulk density (110℃×24h)≥2.85g / cm 3 ,Bulk density (1500℃×3h)≥2.8g / cm 3 , The linear change after firing (1500℃×3h) is ±0.1%.

[0037] The preparation method o...

Embodiment 3

[0042] A castable material for a support frame of a sintering machine is formed by mixing a repairing material base material and an additive, and the weight ratio of the castable base material is: 88% mullite, 7% corundum, and 5% silica powder. The additive is based on the total weight of the castable base material (100%), and is composed of 0.25% of sodium tripolyphosphate or 0.25% of sodium hexametaphosphate, and 0.2% of organic fibers. Among them, the mass ratio of 1-3 mm mullite particles to fine mullite powder with a particle size of <0.088 mm is 2, and the mass ratio of corundum particles with a particle size of 0.1 to 1 mm to the fine corundum powder with a particle size of <0.080 mm is 0.7.

[0043] Its physical and chemical indexes: compressive strength (110℃×24h)≥32Mpa, compressive strength (1500℃×3h)≥68Mpa; bulk density (110℃×24h)≥2.8g / cm 3 ,Bulk density (1500℃×3h)≥2.75g / cm 3 , The linear change after firing (1500℃×3h) is ±0.11%.

[0044] The preparation method of the ca...

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Abstract

The invention discloses a castable for a supporting bracket of a sintering machine. The castable is a mixture of a base material and an additive. The base material comprises, by weight, 80-95 parts of mullite, 5-15 parts of corundum and 5-15 parts of a binding agent. The additive comprises a phosphate and an organic fiber. The castable is low in cost, is high-temperature resistant, is long in service life and is free from sticking materials. The castable can be widely used in supporting brackets supporting bracket of sintering machines.

Description

Technical field [0001] The invention belongs to the field of refractory materials for supporting brackets of sintering machines in the iron and steel industry, and particularly relates to a castable for supporting brackets of sintering machines, and a preparation method and a use method thereof. Background technique [0002] The air permeability of the sintering machine material layer is a key factor restricting the sintering production of the thick material layer. The air volume through the sintering material layer determines the sintering output and the quality of the sinter to some extent. Patent document CN201892422U discloses a support bracket for a sintering machine. The bracket is provided with four support brackets. Each support bracket is a rectangular plate that extends below the upper trapezoidal plate. Both ends of the rectangular plate are provided with U-shaped openings. The width of the U-shaped groove is larger than the corresponding outline size of the transverse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 王长宝高山
Owner LAIWU IRON & STEEL GRP