Preparation method of granulated graphite used in refractory castable

A technology of refractory castables and refractory raw materials, applied in the field of refractory materials, can solve the problems of affecting high temperature performance, increasing porosity, increasing water addition, etc., to improve the uniformity of graphite distribution, reduce the specific surface area, and reduce the contact area. small effect

Inactive Publication Date: 2012-06-13
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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Problems solved by technology

In this way, two fatal problems are faced: first, the unique heterogeneity of flake graphite will lead to poor wettability of water to graphite, and the introduction of graphite into the castable will greatly increase the amount of water added to the castable, making the structure loose , affecting the high temperature performance of castables; second, the density difference between flake graphite and refractory raw materials is large (the density of flake graphite is less than 1.8g / cm3, while the density of fused magnesia is 3.5 g / cm3, the density of fused corundum is greater than 3.9 g / cm3), when graphite and these refractory materials are introduced into the castable, particle segregation will be caused
Compared with directly adding flake graphite, the fluidity has been improved, but there are still some problems: first, it is difficult for graphite to evenly coat the surface of corundum particles, and the uniform distribution in the castable is not achieved; second, a part of graphite in the crushing process Separation from corundum affects the effect of graphite introduction; third, granulated graphite has a lower density and more pores, which increases the porosity of the castable, thus affecting the high temperature performance
However, this kind of granulated graphite should not be directly used in castables: First, its graphite content is low, below 25%, generally about 13%. The particle size of the granulated graphite is less than 1mm, and can only be added to the castable in a small amount (generally no more than 20%), so this granulated graphite cannot introduce enough graphite into the castable; second, the granulated graphite is dried After that, it can be directly used for isostatic pressing without baking treatment, so the combination of graphite and refractory raw materials is not firm. Friction and impact lead to the separation of the granulated graphite structure, which affects the introduction of graphite

Method used

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  • Preparation method of granulated graphite used in refractory castable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh each component according to the following mass ratio:

[0023] Fused magnesia particles (0.5~0.088mm): 31wt%, fused magnesia fine powder (<0.088mm): 41wt%, flake graphite (≤0.150mm): 25wt%, solid phenolic resin powder 3wt%, Add 10.2wt% liquid phenolic resin with a total weight of solid raw materials.

[0024] Set the rotational speed of the granulator to 1200r / min. First put the fused magnesia fine powder, flake graphite and solid phenolic resin powder into the high-speed mixing granulator and mix evenly, take it out for use, and then mix the fused magnesia particles and liquid phenolic resin in high speed according to the proportion Mix evenly in the granulator, then put the previous mixed powder into the high-speed kneading granulator in proportion, carry out coating granulation, dry naturally and then bake at 180°C to obtain a carbon content of 27.9%. 1 # Granulated graphite.

Embodiment 2

[0026] Weigh each component according to the following proportions:

[0027] Fused magnesia particles (0.5~0.088mm): 29wt%, fused magnesia fine powder (<0.088mm): 34wt%, flake graphite (≤0.150mm): 31wt%, Al powder 2wt%, solid phenolic Resin powder 4 wt%, add liquid phenolic resin with a total weight of solid raw materials of 9.5 wt%.

[0028] Set the rotational speed of the granulator to 1000r / min. First put the fused magnesia fine powder, flake graphite, Al powder and solid phenolic resin powder into the high-speed mixing granulator and mix evenly, take it out for later use, and then mix the fused magnesia particles and liquid phenolic resin in proportion Mix evenly in the high-speed mixing and granulating machine, then put the previous mixed powder into the high-speed mixing and granulating machine in proportion, carry out coating and granulation, dry it naturally and then bake it at 150°C, that is, the carbon content is 31.9% of 2 # Granulated graphite.

Embodiment 3

[0030] Weigh each component according to the following proportions:

[0031]Fused magnesia particles (0.5~0.088mm): 5wt%, sintered magnesia particles (0.5~0.088mm): 17wt%, fused magnesia fine powder (<0.088mm): 38wt%, flake graphite (≤0. 150mm): 40 wt%, add 8.5 wt% liquid phenolic resin with the total weight of solid raw materials.

[0032] Set the rotational speed of the granulator to 1500r / min. First put the fused magnesia fine powder and flake graphite into the high-speed mixing granulator and mix evenly, take it out for use, and then mix the fused magnesia particles and liquid phenolic resin in the high-speed mixing granulator in proportion uniform, and then put the previous mixed powder into the high-speed mixing and granulating machine in proportion, carry out coating granulation, dry naturally and then bake at 130°C to obtain carbon content of 40.1%. 3 # Granulated graphite.

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Abstract

The invention belongs to the filed of refractory materials, and relates to a preparation method of granulated graphite used in a refractory castable. The granulated graphite is prepared from raw materials of, by mass: 34-52% of refractory raw material fine powder, 25-40% of flake graphite, 0-9% of solid-state phenol formaldehyde resin powder, 0-15% of an additive, and 22-31% of refractory raw material particles. Also, liquid-state phenol formaldehyde resin which takes 8.5-14.0% of the total weight of the solid raw materials is added. The preparation method comprises steps that: the refractory raw material fine powder, the flake graphite, the solid-state phenol formaldehyde resin powder and the additive are well mixed in a high-speed mixing granulator; a mixture is fetched for later use; the refractory raw material particles and the liquid-state phenol formaldehyde resin are well mixed in the high-speed mixing granulator according to the proportions; mixed powder obtained in the previous steps is placed in the high-speed mixing granulator; coating and granulating are carried out; an obtained material is dried in air, and is baked under a temperature of 100-200 DEG C, such that granulated graphite with a carbon content of 27.1-41.7wt% is obtained.

Description

Technical field [0001] The invention is the field of refractory materials, involving a preparation method for granular graphite for refractory watering. Background technique [0002] The introduction of scale graphite in the refractory material can significantly improve the stability of thermal shock stability of refractory materials, enhance the anti -slag penetration and erosion of the refractory material, and significantly improve the life of refractory materials. [0003] When introducing the scales graphite into refractory pouring materials, you need to mix the refractory raw materials, scale graphite, additives, etc., then add water, stir well in the mandatory mixer, and finally fill it in the mold. On the vibration table of a certain frequency or use the vibration, vibrationPin the stick vibrate.In this way, two fatal problems are faced: First, the unique non -preliminarity of scales graphite can lead to poor wetness of water to graphite. The introduction of graphite into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 张三华王冠张新韦祎
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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