Castable for supporting bracket of sintering machine and preparation and application method thereof

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: 2014-08-13
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 pouring material for the supporting bracket of a sintering machine is formed by mixing repairing material base material and additives, and the weight ratio of the base material of the pouring material is: 85% mullite, 10% corundum, and 5% silicon dioxide micropowder. The additive is based on the total weight of the castable base material (100%), and includes 0.4% of sodium tripolyphosphate or 0.4% of sodium hexametaphosphate, and 0.2% of organic fiber. Among them, the mass ratio of mullite particles of 1-3 mm to mullite fine powder with a particle size of <0.088 mm is 2, and the mass ratio of corundum particles of 0.1-1 mm to corundum fine 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 line change after burning (1500℃×3h) is ±0.12%.

[0030] The preparation me...

Embodiment 2

[0035] A pouring material for the supporting bracket of the sintering machine is made by mixing the base material of the repairing material and additives, and the weight ratio of the base material of the pouring material is: 87% mullite, 7% corundum, and 6% silicon dioxide micropowder. The additive is based on the total weight of the castable base material (100%), and is composed of 0.3% sodium tripolyphosphate or 0.3% sodium hexametaphosphate, and 0.2% organic fiber. 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 0.1-1 mm corundum particles to corundum fine powder with a particle size of <0.080 mm is 0.7.

[0036] Its physical and chemical indicators: 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 line change after burning (1500℃×3h) is ±0.1%.

[0037] The preparation ...

Embodiment 3

[0042] A pouring material for the supporting bracket of a sintering machine is formed by mixing repairing material base material and additives, and the weight ratio of the base material of the pouring material is: 88% mullite, 7% corundum, and 5% silicon dioxide micropowder. 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 fiber. Among them, the mass ratio of mullite particles of 1-3 mm to mullite fine powder with a particle size of <0.088 mm is 2, and the mass ratio of corundum particles of 0.1-1 mm to corundum fine powder with a particle size of <0.080 mm is 0.7.

[0043]Its physical and chemical indicators: 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 line change after burning (1500℃×3h) is ±0.11%.

[0044] The preparat...

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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 sintering machine support brackets in the iron and steel industry, and in particular relates to a castable for sintering machine support brackets and a preparation method and use method thereof. Background technique [0002] The air permeability of the material layer of the sintering machine is the key factor restricting the sintering production of the thick material layer. The amount of air passing through the sintering material layer determines the sintering output and sinter quality to some extent. Patent document CN201892422U discloses a support bracket for a sintering machine. The bracket is provided with four support brackets, and each support bracket extends a rectangular plate connected to the bottom of 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 outer dimension...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 王长宝高山
Owner LAIWU IRON & STEEL GRP
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