Inhibitor addition-based desulfurizing method in iron ore sintering process

Abstract

The invention discloses an inhibitor addition-based desulfurizing method in the iron ore sintering process, and aims to provide a desulfurizing method in the iron ore sintering process, which has the advantages of low investment cost, low operation cost and high desulfurization efficiency. In the method, an ammonia-containing compound is added into a bedding material layer at the bottom of a sintered material layer, ammonium sulfate generated in the reaction of ammonia which is decomposed from the ammonia-containing compound and sulfur oxide in the sintering process is adsorbed to dust and taken away by flue gas; ammonium sulfate-containing dust in the flue gas of an air bellows on the rear half part of a sintering machine is collected by a cyclone dust separator; and the collected dust is washed, filtered and dried to form dry dust, and the filtrate after filtration is concentrated, crystallized and dried to form ammonium sulfate.

Description

technical field [0001] The invention relates to a desulfurization technology in the processing and treatment of pig iron, and more specifically, to a desulfurization method in the sintering process of iron ore. Background technique [0002] 90% of the sulfur dioxide discharged into the atmosphere by iron and steel enterprises (excluding self-provided power plants) comes from sintering plants. Therefore, reducing sulfur dioxide emissions from sintering plants is the top priority of environmental governance for iron and steel enterprises. Governance is an important issue that needs to be addressed urgently. At present, the control methods of sulfur dioxide emissions from sintering plants can be divided into three categories: pre-process control, in-process control and post-process control. [0003] (1) Pre-process control. This method is simple and effective to control the emission of sulfur dioxide in the sintering flue gas by appropriately mixing raw materials with low sul...

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Problems solved by technology

[0007] Its disadvantages are: (1) This method mixes and adds ammonia-containing compounds in all sintering raw materials, and the weight of ammonia-containing compounds is a small amount relative to the weight of sintering raw materials, and a low proportion is added to the sintering mixture. When adding additives, the actual operation of the production process is difficult, and there may be problems such as fluctuations in the ratio, resulting in uneven mixing and a decrease in desulfurization efficiency; (2) Ammonium sulfate produced by the reaction of ammonia and sulfur oxides mainly occurs in the middle and lower parts of the material layer, so Ammonium sulfate is mainly discharged from the air box in the rear part of the sintering machine with the flue gas, and this method treats all the dust collection ash through the dust collection ash water washing system, resulting in a large processing capacity of the water washing system and low sulfur concentration in the dust removal ash , the efficiency of the water washing system becomes low, and the processing is difficult

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