A system and control method for automatically adding red mud to sintering mixture

Abstract

The invention relates to a system and a control method for automatically adding red mud into a sintering mixed material and belongs to the technical field of sintering machine mixed material moisture control. According to the technical scheme, a material tidying device (2) and a microwave moisture meter (3) are installed above a before-primary-mixing belt conveyor (1) in front of a primary mixing machine (10), and a metering scale (4) is installed below the before-primary-mixing belt conveyor (1); a red mud pipe cut-off valve (5), a red mud main frequency-conversion slurry adding pump (6) and a red mud standby frequency-conversion slurry adding pump (7) are installed on a red mud pipeline; a stirring machine (9) is installed in a red mud slurry pool (8); and a rear material tidying device (17) and a rear microwave moisture meter (13) are installed above an after-secondary-mixing belt conveyor (16) behind a secondary mixing machine (15). By means of the system and the control method, the red mud adding flow can be accurately controlled, and the purpose of continuously stabilizing the dryness and humidity degree of the mixed material is achieved; and meanwhile, due to the fact that the red mud is effectively utilized, the ratio of part of refined iron raw materials is reduced, the cost of sinter is reduced, pollutant discharging of a steelmaking enterprise to the exterior is greatly reduced as well, and a good environment-friendly effect is achieved.

Description

Technical field [0001] The invention relates to a system and a control method for automatically adding red mud to a sintering mixture, and belongs to the technical field of sintering machine mixture moisture control. Background technique [0002] With the annual increase in steel production in recent years, the pollution dust produced by steelmaking has also increased significantly. In order to meet environmental protection requirements, the steelmaking process has realized the recovery of polluted dust. After the steelmaking process, the dust is recovered in a red mud state, which is called red mud. However, how to reuse the recovered red mud has become another problem. Because the iron content in red mud is relatively high, if red mud is added to the sintering mixture, the Fe and CaO content of the mixture can be increased, the ratio of iron powder raw materials can be reduced, and the moisture of the material can be adjusted. However, the existing steelmaking red mud treatme...

AI Technical Summary

Problems solved by technology

However, the existing steelmaking red mud treatment process is directly used for sintering after manual operation and simple mixing of the mixture. Most of the workers decide to add red mud according to the measured value of the infrared moisture meter and the surface condition of the sintered material. how much

When adding too much red mud, the PH value of the sinter will decrease (alkalinity decreases), the particle size of the sinter will be loose, the porosity will increase, and the strength will decrease, resulting in fluctuations in the quality of the sinter; when the amount of red mud added is small, the moisture content of the mixture will decrease Insufficient, thereby affecting the quality of iron smelting

Or use the method of adding water or red mud to the primary mixer to control the moisture of the sintered mixture, and use the on-site manual method to control the flow rate. The moisture of the mixture fluctuates greatly and cannot be compensated and adjusted, which will eventually make the particle size of the mixture worse. The deterioration of the sintering speed leads to the slowdown of the sintering speed, which forces the increase of the amount of prepared coal powder, the increase of the return rate, and the decrease of the quality and output of the sinter ore. What's more, the over-dry and over-humid mixture makes the central control system unable to accurately control Sintering end point, resulting in unpredictable vicious accidents

The infrared moisture meter used in the existing compounding system measures the moisture of the mixture. The surface state, color, and structure of the mixture will affect the reflectivity of infrared rays and interfere with the measurement of moisture. For example, adding red mud to the sintering mixture, the color and The structure is different from that without adding red mud, which will affect the accuracy of the infrared moisture meter to collect and measure the wavelength, thereby affecting the measurement accuracy

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