A spraying agent for reducing the edge effect of sintering trolley and its application method

Abstract

The invention provides a spraying agent capable of reducing sintering machine trolley edge effect, and an application method thereof. The spraying agent comprises, by weight, 30 to 50% of red mud, 5 to 10% of tar residue, 10 to 20% of carbonized rice hull, and 25 to 45% of sintering return mine. The application method comprises following steps: the spraying agent is subjected to material weighing and mixing at the raw material composition mass ratio, water is added until water content ranges from 4.0 to 6.0wt%, uniform stirring is carried out, an obtained mixture is heated to 60 to 100 DEG C, and the mixture is sprayed onto the contact parts of a trolley with a sintering material surface and sintering material surface edges until the thickness of the spraying agent ranges from 5 to 10mm. The spraying agent and the application method are capable of avoiding edge effect in the whole sintering process effectively; in sintering, the gaps of the sintering edges are filled, influences of the edge effect are eliminated; thermal insulation is realized; sintering edge air leakage rate is reduced; the spraying agent is economical; and the application method is simple, and is convenient to operate.

Description

technical field [0001] The invention belongs to the field of ironmaking and sintering, and in particular relates to a thermal insulation material for reducing the edge effect of a sintering trolley. Background technique [0002] At the edge of the sintering machine trolley, the material is loose and has a large void ratio, and the material shrinks during the sintering process and separates from the trolley fence to form a side seam, resulting in small edge resistance during the draft sintering process, short-circuiting of the airflow, and a significant increase in wind speed, forming an edge effect. No matter what specification and model of sintering machine is used, it will be affected by the edge effect in production, but the degree is different. Generally, the edge material is underburned and is light red, with few agglomerates and many inclusions. After crushing and screening, most of them are transferred to the return ore, which is often called "red return ore". The e...

AI Technical Summary

Problems solved by technology

The edge effect causes uneven airflow distribution on the material surface, unreasonable thermal system, and poor air permeability, resulting in a lag in the vertical sintering speed in the middle, and different vertical sintering speeds aggravate the uneven airflow distribution, forming a vicious circle, which affects the stable operation of sintering production. Difficulties that directly affect the economic benefits of the enterprise

[0003] At present, there are mainly three methods for suppressing the edge effect: (1) thicken the edge cloth and edge pressing material, such as patent numbers CN 101825395 A, CN 202613974 U, CN 202814080 U, CN 202853373 U, etc., (2) increase the edge ignition temperature , such as Peng Zhijian published "Sintering Machine Edge Effects and Inhibition Measures" in "Sintering Pellets" (May 1995), (3) improving the fence structure, such as patent numbers CN 201003906Y, CN 203224132U, these methods are mainly to increase The air intake resistance in the edge area of ​​the sintering trolley slows down the edge effect to a certain extent, but there is still a gap between the material surface and the baffle plate of the trolley, and the effect of suppressing the edge effect is limited, and the heat loss in the edge area of ​​the trolley is relatively serious, and there is no heat preservation effect