Method for producing ferric oxide fine powder through high-temperature sulfuric-acid residues in fluidized bed combustion boiler

Abstract

The invention discloses a method for producing ferric oxide fine powder through high-temperature sulfuric-acid residues in a fluidized bed combustion boiler, and relates to the technical field of metallurgy. The technical problems of increasing the iron recovery rate, the compactness and the compression resistance index of products are solved. By means of the method, sulfuric-acid residues are heated to 250 DEG C or above through a roasting reduction furnace, and a reduction agent is added to sulfuric-acid residues; heat energy of sulfuric-acid residues is recovered through a steam boiler; sulfuric-acid residues are smashed with water, ball-milled and decomposed in sequence through a smashing machine and a ball mill and then sent into a primary magnetic separator for primary magnetic separation, tailing slurry subjected to primary magnetic separation is subjected to secondary magnetic separation through a secondary magnetic separator, and ferric oxide fine powder is selected through primary magnetic separation and secondary magnetic separation. By means of the method, high-quality ferric oxide fine powder can be produced.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to a method for producing fine iron oxide powder by utilizing high-temperature sulfuric acid slag of a fluidized fluidized furnace. Background technique [0002] Sulfuric acid slag is the tailings after refining sulfuric acid by sulfuric acid production enterprises. It mainly contains iron, and secondarily contains silicon dioxide, calcium, lead, zinc, copper, sulfur, arsenic and other elements. Sulfuric acid slag with low iron content can be used to make concrete, and sulfuric acid slag with high iron content can be selected into iron concentrate powder by magnetic separation, gravity separation, flotation, chemical intrusion and other methods, and this iron concentrate powder can be used to make slag balls group. [0003] But existing sulfuric acid slag is selected as the selected iron fine powder of the method for iron fine powder has the shortcoming that iron recovery rate is low, an...

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Problems solved by technology

[0003] But existing sulfuric acid slag is selected as the selected iron fine powder of the method for iron fine powder has the shortcoming that iron recovery rate is low, and the selected iron fine powder particle is porous spongy, and its density is higher than that of iron ore. The iron concentrate powder produced is much smaller. The slag pellets produced by this iron concentrate powder will have the defects of low compactness and low compressive index. Therefore, the current method of manufacturing slag pellets is to mix iron concentrate powder with iron ore A small amount of sulfuric acid slag selected iron powder (about 15%)

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