Method for preparing carbonyl iron through medium pressure continuous gasification

Abstract

The invention discloses a method for preparing carbonyl iron through medium pressure continuous gasification, and relates to a method for continuously preparing carbonyl iron from an iron alloy material in a fluidized bed synthetic kettle. The method is characterized in that during the preparation process, iron alloy powder and heated CO are led in from the bottom of the synthetic kettle; the iron alloy powder is driven to flow upwards by CO flow; during the rising process, the iron alloy powder is in reaction with high-temperature CO to obtain carbonyl iron gas; the reaction residue and mixed gas of CO and the carbonyl iron are discharged from the top; the reaction residue is obtained via a separation and dust collecting device; the mixed gas of CO and carbonyl iron is cooled and separated to respectively obtain a carbonyl iron liquid and the mixed gas containing carbonyl iron and CO; carbonyl iron powder and pure CO are prepared from the mixed gas via a pyrolysis device; CO returns to the bottom of the synthetic kettle to be involved in the reaction; the whole production is a long period continuous process. The continuous reaction is realized.

Description

technical field [0001] The invention discloses a method for preparing carbonyl iron by medium-pressure continuous gasification, which relates to a method for continuously preparing carbonyl iron from ferroalloy materials in a fluidized bed synthesis kettle. Background technique [0002] The carbonyl iron refining process uses carbon monoxide and metallic iron to react under a certain temperature and pressure to form a metal carbonyl compound, and then pyrolyzes the metal carbonyl compound to obtain a method of pure metal. The carbonyl method of refining iron is not only simple in process, low in energy consumption and high in extraction rate, but also beneficial to the enrichment of precious metals. It is an environmentally friendly process without three wastes. Its products such as iron powder and alloy powder are widely used new materials. [0003] There are currently three industrial carbonyl iron synthesis processes: atmospheric pressure carbonyl method, medium pressure...

AI Technical Summary

Problems solved by technology

Both the high-pressure production process and the medium-pressure production process have the problems of long auxiliary time and low production efficiency in practical operation, and the auxiliary time accounts for about 30% of the annual production period