Iron removing device and technology for fine powder of refractory material

Abstract

The invention discloses an iron removing device and technology for fine powder of a refractory material. The device comprises a fluidized bed furnace, the fluidized bed furnace is provided with, fromtop to bottom, a smoke vent for exhausting furnace gas, a feed port for receiving the fine powder of the refractory material and a discharge port for discharging reduced fine powder of the refractorymaterial, an air distribution plate is arranged in the fluidized bed furnace under the discharge port, a boiling cavity is enclosed by the air distribution plate and part thereover of the fluidized bed furnace, an air inlet cavity is enclosed by the air distribution plate and part thereunder of the fluidized bed furnace, and the air inlet cavity is provided with a flue gas inlet for conveying hotflue gas into the boiling cavity; and a first conveying mechanism, a cooling mechanism, a second conveying mechanism, a ball mill and an iron removing magnetic roller are arranged behind the dischargeport successively. The fine powder whose iron content is higher than 5% of the refractory material is placed in the fluidized bed furnace, and flue gas not lower than 750 DEG C is input into the fluidized bed furnace to form the reducing atmosphere, and thus, iron oxide in the fine powder of the refractory material can be reduced, in the reducing atmosphere, into elementary iron which can be removed by the magnetic roller.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to a device and process for removing iron from refractory fine powder. Background technique [0002] As we all know, most of the bauxite mines in my country are aluminum-iron symbiotic ores, and in the whole calcination process of bauxite ore, the current process is completed in an oxidizing environment, which makes iron in bauxite ore always as Iron oxide exists in the form of iron oxide, which makes it impossible to remove iron by magnetic iron removal, which makes the finished product—iron impurities in refractory fine powder impossible to remove. Once the iron content in refractory fine powder exceeds 5% , will seriously affect the performance of refractory fine powder. If pickling is used to soak the iron oxide in the refractory fine powder to complete iron removal, not only the process is complicated, the cost increases, and serious pollution is caused, but more impo...

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Problems solved by technology

[0003] In order to solve the problem that the iron element content in the existing refractory fine powder is high and it is difficult to remove and utilize, the invention discloses a refractory fine powder iron removal device and process. The material fine powder is placed in a fluidized fluidized furnace, and the flue gas of not lower than 750 ° C is introduced into the fluidized fluidized furnace to form a reducing atmosphere, so that the iron oxide in the refractory fine powder is reduced to elemental iron in a reducing atmosphere, so that the magnetic roller can be used to remove iron. remove iron

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