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Novel dry-method production process of periclase-spinelle brick for cement kiln

A dry process cement and spinel brick technology, applied in the field of refractory materials, can solve the problems of high thermal shock stability, poor service life, etc., and achieve good flexibility, good thermal shock stability, slag penetration resistance and thermal shock performance. improved effect

Inactive Publication Date: 2012-03-28
CHONGQING IRON & STEEL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the periclase-aluminum spinel brick prepared by this method can meet the requirements of the cement kiln firing zone to a certain extent, it also has the disadvantages of low service life and poor thermal shock stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A new dry-process cement kiln periclase-spinel brick production process, the process uses the following steps:

[0027] (1) Crushing and screening: The magnesia, magnesia-aluminum spinel and chromite as brick-making raw materials are crushed and screened separately, so that the particle size distribution of the crushed and screened magnesia is 20 for 5-3mm -22%, 10-12% for 3-1mm, 8-11% for 1-0mm, 30-38% for ≤0.088mm; the particle gradation of magnesium aluminum spinel is 5-7% for 5-3mm , 3-1mm is 5-7%, 1-0mm is 5-7%; the particle size of chromite is ≤0.088mm;

[0028] (2) Ingredients: 77% magnesia by weight, 15% magnesia-alumina spinel, 8% chromite and 5% sodium hexametaphosphate saturated solution after crushing and screening Binder for batching;

[0029] (3) Mixing: Mix the brick-making raw materials evenly after the batching is completed, and the mixing time is 20 minutes;

[0030] (4) Forming: forming the brick-making raw materials that have been kneaded into ado...

Embodiment 2

[0037] A new dry-process cement kiln periclase-spinel brick production process, the process uses the following steps:

[0038](1) Crushing and screening: The magnesia, magnesia-aluminum spinel and chromite as brick-making raw materials are crushed and screened separately, so that the particle size distribution of the crushed and screened magnesia is 20 for 5-3mm -22%, 10-12% for 3-1mm, 8-11% for 1-0mm, 30-38% for ≤0.088mm; the particle gradation of magnesium aluminum spinel is 5-7% for 5-3mm , 3-1mm is 5-7%, 1-0mm is 5-7%; the particle size of chromite is ≤0.088mm;

[0039] (2) Ingredients: 75% magnesia, 17% magnesia-aluminum spinel, 8% chromite and 5% sodium hexametaphosphate saturated solution after crushing and screening. Binder for batching;

[0040] (3) Mixing: Mix the brick-making raw materials evenly after the batching is completed, and the mixing time is 15 minutes;

[0041] (4) Forming: forming the brick-making raw materials that have been mixed into adobe, and the...

Embodiment 3

[0048] A new dry-process cement kiln periclase-spinel brick production process, the process uses the following steps:

[0049] (1) Crushing and screening: The magnesia, magnesia-aluminum spinel and chromite as brick-making raw materials are crushed and screened separately, so that the particle size distribution of the crushed and screened magnesia is 20 for 5-3mm -22%, 10-12% for 3-1mm, 8-11% for 1-0mm, 30-38% for ≤0.088mm; the particle gradation of magnesium aluminum spinel is 5-7% for 5-3mm , 3-1mm is 5-7%, 1-0mm is 5-7%; the particle size of chromite is ≤0.088mm;

[0050] (2) Ingredients: 81% magnesia, 14% magnesia-alumina spinel, 5% chromite and 4% sodium hexametaphosphate saturated solution after crushing and screening Binder for batching;

[0051] (3) Mixing: Mix the brick-making raw materials evenly after the batching is completed, and the mixing time is 12 minutes;

[0052] (4) Forming: forming the brick-making raw materials that have been kneaded into adobe, and th...

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Abstract

The invention discloses a novel dry-method production process of a periclase-spinelle brick for a cement kiln, which comprises the following steps: first, crushing and sieving raw materials, and then, blending 75-81% of magnesia, 13-19% of magnesium-aluminum spinelle and 4-8% of chromite in weight ratio as well as 4-5% of sodium hexametahposphate saturated solution binding agent, mixing the obtained mixture, molding the mixed mixture, baking and sintering the molded mixture at a temperature of 450-500 DEG C to form the periclase-spinelle brick for the cement kiln. The periclase-spinelle brickproduced and obtained by adopting the process provided by the invention has good flexibility; the slag penetration resistance performance and the thermal shock resistance performance of the periclase-spinelle brick are both improved to some extent; in the later period of the use of the periclase-spinelle brick, a kiln coating well protects a rotating body from being eroded; the service life of the periclase-spinelle brick is equivalent to that of a conventional magnesia-chromite brick; further, the Cr6+ pollution does not exist; and the periclase-spinelle brick is more environment-friendly.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to a periclase-spinel brick for cement kilns and a production process thereof. Background technique [0002] At present, most of the cement production in our country is produced by dry method or semi-dry method. The length of each zone of cement kiln is short and the temperature changes frequently, which requires the use of refractory materials with high thermal shock stability. At present, the refractory materials used by most cement plants are phosphate-bonded high-alumina bricks (phosphate bricks) and magnesia-chrome bricks, but these two bricks have their own shortcomings and cannot fully meet the requirements of production and environmental protection. [0003] Phosphate bricks are high-alumina materials and are slightly acidic, while the atmosphere in the cement kiln is an alkaline atmosphere containing calcium. Very low service life. [0004] Directly bonded magnesia-chr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 邬贵轩陈文峰罗向东杜春天汤佐甘乐才
Owner CHONGQING IRON & STEEL (GRP) CO LTD