Updraught Sintering

The initial development of sintering was based on the principles described above, wherein air passes down through the sinter bed to windboxes located beneath the sinter machine grate and under suction - so termed downdraught sintering . 

In the downdraught operation any molten oxide phases formed tended to flow downwards into unreacted material and could dissolve some of the sulfides. Hence, it was difficult to reduce sulfur to low levels in product sinter and often grinding and re-roasting was necessary (Willis, 1980). 

Feeding the machine is then in two parts - one position for the ignition layer and one for the main layer. In some machines entirely separate feed systems are used in others the feed is split to the ignition hopper and the main hopper using an intermittent diversion chute or conveyor. The disadvantage of the latter system is that the level in the hoppers varies and as indicated above can vary the packing density of the sinter charge. It also makes smooth control of the machine more difficult if controls are linked to the level of material in the main feed hopper. 

Machine speed is generally in the range of 1.0 to 1.5 m/min, and machines are generally wider at around 3 m to minimise the edge effects which result in air bypassing the bed. 

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Smelting Updraught Sinter Machine / Blast Furnace Updraught Sin Machine / Blast Furnace Updraught Sinter Machine / Imperial Smelting Furnace QSL-Process Short Rotary Furnace Sinter Machine / Blast Furnace Dross Rovorberatory... 

Smelting Kaldo Flash Smelter I Updraught Sinter Machine / Updraught Sinter Machine/ Kivcet Furnace ... 

Smelting KIVCET Updrau Sinter Machine/ Blast Furnace UpdraugM Sinter Machine/ Blast Furnace Updraught Sintor Machine/ Blast Furnace QSL-Process... 

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