Method for sintering high-range calcined lime

Abstract

The invention relates to a method for sintering high-range calcined lime, aiming at improving the air permeability of sintering mixture, strengthening the sintering process and improving the yield and quality of sinter. The method comprises the following steps of: installing a fluidization device in a calcined lime bin to solve the binder problem of the calcined lime bin, wherein the components after adding calcined lime in blending ore are as follows: 86.5-88.0 percent of blending ore, 9-10 percent of calcined lime and 3.0-3.5 percent of serpentine; manually setting the corresponding feeding proportion according to the actual blanking range and the working condition of each feeding screw; increasing the maximum ability of a screw electronic scale to 50tons / h to regulate the blanking amount of the feeding screw at any time; reversely regulating the adding quantity of calcined lime according to the water variation; when the water in the mixture is constant, reducing the calcined lime by 0.3 percent for increasing per ton of water amount in the same material, vice versa; and controlling the temperature and pressure range in the sintering process of the sinter as follows: the sintering ignition temperature is 1080-1130 DEG C, the negative pressure of gas flue is 13,500-16,000Pa, the temperature for sintering waste gas is 110-130 DEG C and the terminate temperature is 390+ / -20 DEG C.

Description

Technical field [0001] The invention relates to a large-scale quicklime sintering method in the technical field of iron and steel metallurgy production. Background technique [0002] In iron and steel metallurgical sintering production, the method of adding quicklime is generally used to strengthen the sintering process. Domestic enterprises usually have a ratio of quicklime between 4-6%, while in Japan, where the sintering technology is more advanced, the ratio of quicklime is only 2-3%. %. Under the condition of raw material structure mainly composed of magnetite concentrate powder, it is more important to increase the proportion of quicklime to improve the sintering production process. Practice has proved that if the proportion of quicklime is too high, especially after it exceeds 5%, it will encounter many difficulties in its stable addition. Due to the high CaO content and high activity of quicklime, suspensions in the warehouse frequently occur in actual production. ...

AI Technical Summary

Problems solved by technology

Practice has proved that when the proportion of quicklime is too high, especially after it exceeds 5%, it will encounter many difficulties in its stable addition. Due to the high CaO content and high activity of quicklime, frequent occurrence of material suspension in the warehouse during actual production It will lead to problems such as disconnection of quicklime or abnormal increase of instantaneous flow caused by ash spraying at the discharge port. In mild cases, it will cause large fluctuations in the moisture content of the mixture, affecting the control of cloth distribution and sintering end point. Material pressure belt and other problems, so as to form production accidents, and also bring adverse effects on the stability of sinter quality, especially the stability of chemical composition

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