Iron ore concentrate drying device and method for pelletizing

Abstract

The invention relates to the technical field of pellet production, and in particular relates to an iron ore concentrate drying device for pelletizing and a drying method. A discharge end of a cylindrical drier is provided with a drying furnace, thus the feed flow and hot air flow form a reverse flow mode of motion; the drying furnace is provided with a chimney which is provided with an electrically operated valve; a discharge port of the cylindrical drier is sealed through a dried iron ore concentrate by adopting a pulling-type discharging mode; a charge chute outlet is close to the inner cylinder wall of the cylindrical drier, and streamlining design is adopted for a windward side of the intersection of the charge chute and a waste gas pipeline. the drying device and the drying method provided by the invention have the advantages of good heat exchanging, the energy consumption of the drying working procedure of the iron ore concentrate is reduced effectively; the size of the drying cylinder is reduced, and the device investment is lowered; when accidents are occurred to the drier or to an oven stove at the initial stage of production, high-temperature smoke can be emitted emergently, the burning to an adhesive tape of an adhesive tape machine or a scaleboard of the charge chute by the smoke can be prevented; and by adopting the pulling-type discharge mode, the problems of severe pollution, low drying efficiency, high failure rate of the device and the like in a drying plant can be solved radically.

Description

technical field [0001] The invention relates to the technical field of pellet production, in particular to iron concentrate drying equipment and a drying method for pellets. Background technique [0002] The process of producing pellets has very strict requirements on the physical and chemical properties of the pelletizing raw material iron concentrate, especially the moisture content of the iron concentrate has a great influence on the pelletizing performance. The iron ore concentrate in the current pellet production line is generally piled in the open-air raw material yard, so it is greatly affected by the weather. In order to ensure the stability of the moisture content of the iron concentrate, the iron concentrate drying process is adopted in the pellet production line. In the traditional iron concentrate drying process, since the drying furnace is set at the feed end of the cylinder dryer, the exhaust gas pipeline is set at the discharge end, so that the material flow ...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: 1) The average temperature difference between the flue gas and iron concentrate is small, the heat transfer efficiency is low, and the energy consumption is large; 2) The equipment size is large, the initial investment cost is large, and the operating cost is high; 3) Due to the If it is installed in the high-temperature flue gas area, the tape of the feeding tape machine and the lining board of the feeding chute will be damaged by the backflow of hot air or the baking of hot flue gas; 4) Due to the intersection of the feeding chute and the hot air duct of the drying furnace, The feed chute will reduce the air supply area of ​​the hot air duct of the drying furnace; 5) When an accident occurs in the dryer or the oven is baked in the early stage of production, the high-temperature flue gas in the dryer cannot be discharged in time, which makes the state of the oven and production accidents very difficult to deal with. Difficult; 6) The forced air extraction process is adopted for the dry waste gas. Since no effective measures are taken at the feed end and the discharge end, the air leakage is serious, which increases the workload of the dust removal fan and dust collector

Images