Novel energy-saving technology for producing pellets with fine-grained iron ore concentrates

Abstract

The invention discloses a novel energy-saving technology for producing pellets with fine-grained iron ore concentrates, which is characterized in that the novel energy-saving technology comprises the following steps that pulp of the iron ore concentrates is fed to an ore concentrate thickening machine to be thickened, fed to a ceramic filtering machine, subjected to batching, mixed by an intensive mixing machine, and pelletized by a disc pelletizer; then fresh pellets after being pelletized are fed to a small roll screen for screening; after the fresh pellets are treated by the small roll screen, the fresh pellets in unqualified grain sizes are return to the pelletizing process for pelletizing again, while the fresh pellets in qualified grain sizes are fed to a large roll screen for secondary screening; undersized products screened by the large roll screen return to the pelletizing process; the products on the large roll screen are fed to a chain grate; and after being fed to the chain grate, the qualified fresh pellets are dried and preheated by the chain grate, and then fed to a rotary kiln to be calcined and cooled to be qualified pellet products. The novel energy-saving technology has the advantages that on the premise that the product quality of the pellets is ensured, energy conservation and emission reduction are realized by optimizing the production technology and improving the production flow.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a new energy-saving process for producing pellets from fine-grained iron concentrates. Background technique [0002] With the effective implementation of the macro-control and result optimization of my country's iron and steel industry, the construction speed of the pellet plant is very rapid. At present, there are more than 50 pellet production lines with a scale of more than one million tons. Furnace charge structure, to increase iron and save coke, reduce pig iron production cost, provide the most basic conditions and the most effective technical measures. There are generally three processes for the production of pellets, namely shaft furnace, belt machine and chain grate machine-rotary kiln. At present, the pellet production process of large and medium-sized enterprises is mainly based on belt machine and chain grate machine-rotary kiln. Because the cha...

AI Technical Summary

Problems solved by technology

However, the chain grate machine-rotary kiln production process is not perfect. For example, the iron concentrate required for the production of pellets needs to be dried in a drying kiln to reduce the moisture content to below 9% to meet the requirements of the next mixing and pelletizing process. Converted into Each ton of pellets needs to consume about 1 kg of coal, and the wet return material produced during the pelletizing process and the broken balls and powder under the chain grate plate sieve, that is, dry bulk materials, require special crushing equipment (generally However, since the design of the wet return crushing equipment itself is not necessary, and the crushing effect of the dry return crushing equipment has not been ideal, a large amount of spare parts, electric energy and labor maintenance costs are wasted in vain

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