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Novel A-C refractory material for cement kilns, and preparation method thereof

A refractory material, A-C technology, applied in the field of refractory material and its preparation, new A-C refractory material for cement kiln and its preparation field, can solve the problems affecting the service life and operation quality of equipment, kiln body deformation, large surface area, etc., to achieve Excellent adhesion to kiln skin, high refractoriness, excellent wear resistance and heat insulation effect

Active Publication Date: 2015-05-06
大石桥市中建镁砖有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the cement kiln body is exposed outdoors, the surface area is large, and the heat loss is serious. In addition to causing huge energy waste, it is more likely to cause deformation of the kiln body and affect the service life and operation quality of the equipment.

Method used

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  • Novel A-C refractory material for cement kilns, and preparation method thereof
  • Novel A-C refractory material for cement kilns, and preparation method thereof
  • Novel A-C refractory material for cement kilns, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The preparation method of the starting material is as follows.

[0082] Step 1. Synthetic preparation of raw materials:

[0083] (1) Mix industrial aluminum oxide and CaO powder (a small amount of MgO powder can also be added during quenching and tempering modification) according to a certain weight ratio, adjust the A / C ratio in the raw material, and limit it to 11.5-12;

[0084] (2) Use a ball mill to co-grind the above mixed powder to less than 0.045mm, so that it is fully and evenly adhered, the surface defects of fine particles are increased, the activity is enhanced, and the density is increased;

[0085] (3) Add 10% of sulfite pulp waste liquid with a specific gravity of 1.3KG / DM3 to the co-milled powder, mix well and extrude it into a blank, and the molding pressure is not less than 200MPa and the density of the blank is not less than 2.60KG / DM3;

[0086] (4) After the green body is dried in a drying kiln at 80-120 ℃ for 48 hours, the kiln trolley is loaded int...

Embodiment 2

[0108] The preparation method of the starting material is as follows.

[0109] Step 1. Synthetic preparation of raw materials:

[0110] (1) Mix industrial aluminum oxide and CaO powder (a small amount of MgO powder can also be added during quenching and tempering modification) according to a certain weight ratio, adjust the A / C ratio in the raw material, and limit it to 23.5-24.0;

[0111] (2) Use a ball mill to co-grind the above mixed powder to less than 0.045mm, so that it is fully and evenly adhered, the surface defects of fine particles are increased, the activity is enhanced, and the density is increased;

[0112] (3) Add 10% of sulfite pulp waste liquid with a specific gravity of 1.3KG / DM3 to the co-milled powder, mix well and extrude it into a blank, and the molding pressure is not less than 200MPa and the density of the blank is not less than 2.60KG / DM3;

[0113] (4) After the green body is dried in a drying kiln at 80-120 ℃ for 48 hours, the kiln trolley is loaded i...

Embodiment 3

[0135] In the preparation method of the original raw material, the third component of high-purity magnesia is introduced, and the remaining steps are as described above, and the A / C ratio in the raw material is adjusted to be limited between 11.5 and 12.0.

[0136] The appearance, size and cross-section of the finished bricks out of the kiln are qualified, and the physical and chemical properties must meet the following requirements:

[0137] (1) Component weight percentage:

[0138] Ai 2 O 3 83.5%

[0139] CaO 7%

[0140] MgO 9.5%

[0141] (2) The index of the refractory material is:

[0142] Thermal conductivity: 1.80-3.0 W / M K;

[0143] Bulk density: 2.85 G / CM3;

[0144] Thermal shock stability (1100℃-water cooling): 6 times;

[0145] Normal temperature compressive strength: 40 MPa.

[0146]

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Abstract

The invention discloses a novel A-C refractory material for cement kilns, and a preparation method thereof. The refractory material comprises 80-95% of Al2O3, 4-10% of CaO and 0-10% of MgO. The preparation method comprises the following steps: 1, co-grinding industrial alumina and low-impurity quicklime, and artificially synthesizing a highly pure A-C raw material to make the refractory material have designed physical and chemical indexes; and 2, using the raw material pre-synthesized in step 1 to prepare the novel A-C compact and shaped refractory material for cement kilns, having designed physical and chemical indexes. The novel A-C refractory material has the characteristics of excellent kiln coating adhesion, no chromium and environmental protection, has low heat conductivity, high refractoriness and strong high temperature spalling resistance under high bulk density, and can be used as a raw material of compact shaped products or unshaped products.

Description

technical field [0001] The invention relates to a refractory material and a preparation method thereof, in particular to a novel A-C quality refractory material for cement kilns with low thermal conductivity and a preparation method thereof, belonging to the technical field of refractory material preparation. Background technique [0002] The service life and use effect of refractory materials for cement kiln directly affect the economic benefits, environmental protection and consumption reduction level of enterprises. Because the cement kiln body is exposed outdoors, the surface area is large, and the heat loss is serious, in addition to causing huge energy waste, it is more likely to cause deformation of the kiln body and affect the service life and operation quality of the equipment. Therefore, the material itself is required to have excellent thermal insulation effect in addition to the properties that general cement kiln refractories should have. [0003] The special p...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 陈峰唐家彬李兆林
Owner 大石桥市中建镁砖有限公司