Objective Sintering of iron ore is a key step in the iron making process (prior to te Blast Furnace). It is an energy intensive activity. Ore dust is collected and recycled but it leads to poor permeability of the ore and an increased energy usage. In this new process a flexible pneumatic transport system will be used to return the dust to a central location. This will lead to energy savings in the sintering process.Both gas and electricity will be saved.In the sinter plant several iron ores are carefully prepared (dosed and mixed with water, additions and coke-breeze) to get a homogene and permeable structure. The mix is brought up into three parallel endless straight grates. The sintering starts by igniting the top layer of the bed of ore-fuel mix with coke-oven gas. By sucking air through the bed, the rest of the bed will also be ignited (at sintering temperature). After being cooled and broken the sintered ore is suitable for the blast furnace process. In principle, dust caught out of waste gas or dedusting chambers is sintered ore. The recycling still occurs with well-known difficulties with existing transport systems as conveyor belts to the end or halfway the ore preparation route. So dust is conveyed from 32 waste gas cyclones of the sinter machines, 3 fabric filters (SF11, 21 and 31) and 3 electrostatic precipitators (EF11, 21 and 31). A disadvantage is that the recycled dust from the cyclons comes partly free again at filters. Moreover, recycled dust of all these filters will disturb the careful preparation of the ore-fuel mixture by causing inhomogenity and less permeability of the ore-mix on the straight grate.NEW SITUATIONThe dust outlets of the cyclones and filters are connected with 11 feeder chambers of a pneumatic transport system, with which the dust is transported to a central collecting bin by means of an air stream, directly or via a booster station. The existing dust recycling system is replaced in this way with the essential difference that all the dust is collected in one central point at the start of the ore preparation route. The collecting bin has to be reconstructed and completed with a dedusting system and extracting and dosing installations to dose the dust on the two ore-mix conveyor belts. The result : an ore stream which is treated much better, so that the ore-fuel mix ignition temperature can be lowered by 100 centigrades. At a level of 1200 deg this means a reduction ofenergy consumption with 100/1200 or 8.5 %. Programme(s) ENG-ENDEMO C - Programme (EEC) of demonstration projects and industrial pilot projects (EEC) in the energy field, 1985-1989 Topic(s) 3.4 - INDUSTRY Call for proposal Data not available Funding Scheme DEM - Demonstration contracts Coordinator HOOGOVENS GROEP BV EU contribution No data Address POSTBUS 10000 1970 Ijmuiden Netherlands See on map Total cost No data
