Updraught type slag ultrafine powder pre-grinding deironing method

Abstract

The invention discloses an updraught type slag ultrafine powder pre-grinding deironing method, and belongs to the recycling of waste in the field of metallurgy. The first slag-iron separation is effectively realized after the first magnetic separation is performed on the slag by a first updraught magnetic separator, so that the slag after the first magnetic separation can form a two-layer material with the upper layer of abrasive grit and the lower layer of slag; the two-layer material after the first magnetic separation is secondarily separated when beginning the free fall after arriving the end head of a belt conveyor, that is, the abrasive grit at the upper layer after the first magnetic separation is upward suck by a second updraught magnetic separator, and the slag at the lower layer downward falls. According to the slag after the magnetic separation provided by the invention, when the slag ultrafine powder is produced by a vertical roller mill, the service life of the mill roller refractory can be prolonged by more than 10 days, the yearly vertical mill operation time at least can be increased by 30 days, not only the device maintenance cost is saved, but also the yearly output is increased, and the enormous economic benefit is created.

Description

technical field [0001] The invention belongs to waste recycling in the field of metallurgy. Background technique [0002] With the rapid growth of steel production, the total amount of metallurgical waste slag has also increased year by year, and the amount of steel slag and slag has increased significantly. In recent years, the state has actively promoted energy conservation, emission reduction and recycling to achieve sustainable development of enterprises. Therefore, the processing and effective utilization of slag need to be solved urgently. The production of superfine slag powder by vertical roller mill has become the first choice for deep processing of slag in TISCO because of its high efficiency, low consumption and no pollution. [0003] The current processing mode uses a belt-type iron remover as a magnetic material separator. Since most of the iron particles are contained or squeezed by the slag, the belt-type iron remover selects the iron particles, so that a la...

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Problems solved by technology

[0003] The current processing mode uses a belt-type iron remover as a magnetic material separator. Since most of the iron particles are contained or squeezed by the slag, the belt-type iron remover selects the iron particles, so that a large number of slag iron particles are brought into the mill. As a result, the grinding rollers and grinding discs of the vertical mill are severely worn, and they are forced to stop for inspection every two months, and each inspection takes 7 to 10 days

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