Preparation method for special casting material of ferronickel rotary kiln discharge opening

Abstract

The invention discloses a preparation method for a special casting material of a ferronickel rotary kiln discharge opening. The special casting material is prepared from the following materials in percentage: 40-80% of material bauxite or/and adamantine spar aggregate, 5-20% of electric smelting mullite or/and adamantine spar fine powder, 3-10% of alumina micro powder, 3-10% of silicone micro powder, 1-8% of pure calcium aluminate cement and 3-30% of calcium zirconate or/and zirconite. The preparation method has the advantages that corrosion resistance, thermal shock resistance and performance in moderate-temperature intensity can be improved greatly; utilization requirements of the ferronickel rotary kiln discharge opening are met. Compared with the conventional casting materials used by cement kiln discharge openings, the service life of the casting material can be prolonged by three months.

Description

technical field [0001] The invention relates to a refractory material for a nickel-iron rotary kiln, in particular to a method for manufacturing a special pouring material for a discharge port of a nickel-iron rotary kiln. Background technique [0002] At present, the refractory materials and configurations used in the nickel-iron rotary kiln for smelting ferronickel are basically borrowed from the refractory materials and configuration used in the cement rotary kiln. Since the cement material and nickel-iron alloy will be very different in the smelting process, There are significant differences in the material state, smelting temperature, and material erosion ability, which lead to a short service life of nickel-iron rotary kiln refractories borrowed from cement kiln refractories, which seriously affects the operation and production costs of nickel-iron smelting . [0003] When the nickel-iron rotary kiln is produced, the material at the kiln mouth is already in a molten ...

AI Technical Summary

Problems solved by technology

[0002] At present, the refractory materials and configurations used in the nickel-iron rotary kiln for smelting ferronickel are basically borrowed from the refractory materials and configuration used in the cement rotary kiln. The material and nickel-iron alloy will be very different in the smelting process, and there are major differences in the material state, smelting temperature, material erosion ability, etc., which leads to the use of nickel-iron rotary kiln refractories borrowed from cement kiln refractories. Short service life seriously affects the operation and production cost of ferronickel smelting

[0003] During the production of the nickel-iron rotary kiln, the material at the kiln mouth is already in a molten state, and the molten material has a considerable erosion on the castable at the kiln mouth. Fluctuates frequently, and is in the medium temperature stage of castable sintering, but the performance of the currently used castables in terms of corrosion resistance, thermal shock resistance and medium temperature strength is relatively poor, resulting in a short service life. Some manufacturers provide kiln mouth castables The service life is even only one month, which greatly increases the smelting cost of ferronickel