Suspension roasting device and technology for producing multiform aluminum oxide

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a suspension roasting device and technology for producing multiform aluminum oxide. The device is composed of a feeding system, a roasting system, a crystal separation system and a cyclone dust removal system, wherein the feeding system comprises a quantitative feeder, a spiral feeder and a drier, the roasting system comprises a cyclone preheater, a roasting furnace and a burning station, the crystal separation system comprises a cyclone separator, a crystallizer, a controllable material level valve, a cyclone cooler and a drying cooler, and the cyclone dust removal system comprises a dust remover, an induced draught fan and a chimney. During working, an aluminum hydroxide filter cake serves as the raw material, the roasting temperature of the roasting furnace and the time for materials staying in the crystallizer are adjusted according to different requirements of multiform aluminum oxide products, and finally obtained different aluminum oxide products are discharged out of the drying cooler. According to the device and technology, metallurgical aluminum oxide and high-temperature aluminum oxide are produced at the same time with one set of device and the same kind of material by adjusting operating parameters.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a suspension roasting device and a roasting process for producing multi-variety alumina. Background technique [0002] From the perspective of application, alumina products can be divided into metallurgical alumina and special alumina (non-metallurgical alumina). The production process of metallurgical grade alumina and special alumina is completely different. Metallurgical alumina is mainly used to manufacture primary aluminum. High-temperature alumina in special alumina is used in ceramics, chemical industry and other fields, and with the rapid expansion of its application fields, its production technology has gradually been valued by various countries and manufacturers. [0003] At present, the production of metallurgical alumina adopts the suspension roasting process, while the production of high-temperature alumina adopts the rotary kiln process, and industria...

AI Technical Summary

Problems solved by technology

[0005] The temperature of the firing zone cannot be directly and accurately measured, and the product quality is unstable;

[0006] When the output is changed, it is easy to produce lumpy material, and the lumpy material and kiln body speed have a great impact on product quality;

[0007] Large heat dissipation and high exhaust gas temperature, so the operation energy consumption is high;

[0008] There are many operating equipment, high failure rate and high maintenance cost;

[0009] The production capacity of a single unit is small, and the construction and operation costs are high

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