Method for adding water in superfine hematite powder sintering process

Abstract

The invention discloses a method for adding water in a superfine hematite powder sintering process, which comprises the following steps: (1) stabilizing the speed of the sintering machine; (2) improving and controlling the water addition method; and (3) modifying the tertiary mixer, and adding water to the mixture in a multipoint dispersed mode. The method implements multisection dispersed water addition to the mixture, enhances the accurate control on the water content in the mixture, improves the granulation effect of the sintering mixture, implements uniform heat transfer in the sintering process, and enhances the sintered ore yield, drum strength, sintered ore powder ratio and other indexes.

Description

technical field [0001] The invention relates to a water-adding method for superfine hematite powder sintering. Background technique [0002] In the sintering of all refined powder, a kind of ultra-fine hematite powder is used for sintering production, and the proportion reaches 40%~50%. 2 / g, a large amount of water needs to be added in the process of sintering, mixing and granulation to meet the requirements of sintering conditions, and the range of suitable sintering moisture for this material is narrow, making it difficult to control. In the use of this ultra-fine hematite powder, there is a phenomenon that the granulation effect of the mixture is deteriorated. Since there are fewer ball cores in the mixture, the content of the mixture with a particle size of less than 3mm is low, and the moisture makes the granulation balls easy to stick to each other. The formation of large balls leads to poor particle size uniformity of the mixture. The content of the mixture with a p...

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Problems solved by technology

In the use of this ultra-fine hematite powder, there is a phenomenon that the granulation effect of the mixture is deteriorated. Since there are fewer ball cores in the mixture, the content of the mixture with a particle size of less than 3mm is low, and the moisture makes the granulation balls easy to stick to each other. The formation of large balls leads to poor particle size uniformity of the mixture. The content of the mixture with a particle size greater than 8mm is as high as about 25%, and the air permeability of the sinter layer is reduced. This working condition not only affects key quality indicators such as sinter strength and powder rate, but also causes Sinter production declines

At the same time, the moisture content of the mixture will have a greater impact on the sintering conditions. If it is slightly dry, the granulation effect will deteriorate, the sintering conditions will deteriorate sharply, the air permeability of the material layer will decrease significantly, the sintering process will be difficult, raw material will appear, and the sintering powder rate will increase. If the moisture is too high, the sintering process will be too fast, the temperature of the combustion zone will decrease, and the amount of liquid phase formation will decrease, which will affect the sintered ore powder rate and drum strength. high

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