Preparation method of energy-saving fire-resistant prefabricated part for ferronickel pre-reduction rotary kiln

Abstract

The invention provides a preparation method of an energy-saving fire-resistant prefabricated part for a ferronickel pre-reduction rotary kiln. The prefabricated part is composed of an inner-layer wear-resistant heavy castable and an outer-layer low-heat-conduction light-weight heat-preservation castable. By adding an interface reactant, the heavy castable and the light castable are fused through interface reaction to prepare an integral material, the interface of the two materials is eliminated, thermal stress concentration generated by the difference of thermal expansion coefficients of materials between the inner layer and the outer layer in the operation process of the rotary kiln can be released in a transition layer between the inner layer and the outer layer, and damage caused by extrusion cracking of an interface between the heavy castable and the light castable is avoided. The problems of material damage and the like caused by falling and sliding of heavy materials in the prior art are also solved. The preparation method is simple and convenient, large-scale popularization and implementation can be achieved, and meanwhile the masonry construction efficiency is high.

Description

technical field [0001] The invention relates to a pre-reduction rotary kiln used in the field of ferronickel smelting by RKEF technology, in particular to a method for preparing an energy-saving refractory prefabricated part for the ferronickel pre-reduction rotary kiln. Background technique [0002] The lining of the pre-reduction rotary kiln used in the nickel-iron smelting field of RKEF process is usually poured and constructed on the production site. It is generally divided into anchor nail welding, fiber material laying and refractory pouring. The furnace lining is often only constructed of heavy refractory castables with deviations in thermal insulation performance. The furnace shell temperature reaches 180-250°C in the early stage of production. A large amount of heat loss leads to high coal consumption and poor production economy. In addition, with the gradual wear of refractory castables during the production process, the temperature of the furnace shell will furthe...

AI Technical Summary

Problems solved by technology

Due to the difference in thermal expansion coefficient of the two lining materials, stress concentration is easily generated at the interface during the heating and cooling process of the materials, which may cause cracking or extrusion damage