Emergency Repair Method for Lining in High Temperature Zone of Nickel-iron Rotary Kiln

Abstract

The invention provides a ferronickel rotary kiln high-temperature area lining emergency repair method. 2-4 straight holes of 200*200 mm are formed in per square meter of a repair area to directly reach a kiln shell for cleaning of the repair area; V-shaped anchoring nails with heights of 80 mm are welded on anchoring nails, and the anchoring nails are arranged at intervals of 130*130 mm; mixtures of 25 Kg, mineral admixtures and binding agents are poured in a mixer for dry mixing by 2-3 minutes to achieve uniform stirring; bonding agents of 5-6 wt% are fed for wet mixing by 2-3 minutes to achieve uniform stirring; linings are manually tamped; a rubber hammer or a vibrator is applied to tamp powerfully after agglomerate filling; and after the plastic construction is finished, the baking is performed after 1-3 days of natural curing. The method improves the strength, the wear resistance, the thermal shock resisting stability and the stripping resistance of medium-temperature and high-temperature materials, achieves excellent bonding performances and construction performances, is used for repairing parts inconvenient to construct of thermal equipment castable and the linings, is convenient to use, prolongs the service life of the rotary kiln linings, and can realize ignition operation without baking after construction.

Description

technical field [0001] The invention belongs to the field of kilns, and in particular relates to an emergency repair method for lining in a high-temperature zone of a nickel-iron rotary kiln. Background technique [0002] According to our investigation and data summary of the nickel-iron rotary kiln, more than 80wt% of the shutdown and maintenance of the large-scale nickel-iron rotary kiln are caused by the damage of the kiln lining in the high temperature zone of the rotary kiln. [0003] The damage of the rotary kiln is mostly characterized by spalling. The reason for this is that the laterite ore, the raw material for kiln firing, is a mixed and associated ore body of sandy mafic olivine and iron-bearing clay, and the ore body contains a high amount of bound water. And free water, so during the firing process, the magnesium, iron, K, Na, S and other active elements contained in the material react with Si and Al elements in the kiln lining, causing a metamorphic layer to a...

AI Technical Summary

Problems solved by technology

[0003] The damage of the rotary kiln is mostly characterized by spalling. The reason for this is that the laterite ore, the raw material for kiln firing, is a mixed and associated ore body of sandy mafic olivine and iron-bearing clay, and the ore body contains a high amount of bound water. And free water, so during the firing process, the magnesium, iron, K, Na, S and other active elements contained in the material react with Si and Al elements in the kiln lining, causing a metamorphic layer to appear on the surface of the kiln lining, resulting in surface cracks and peeling off; However, the rolling of materials in the kiln in the high-temperature zone will fill the cracks, causing the lining to continue to peel off along the cracks, making the kiln lining thinner, and some kiln linings cannot meet the use requirements. Because every time it is time for maintenance, the kiln lining must be repaired in an emergency

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