A method for treating iron and steel smelting slag

Abstract

The invention relates to a treatment method for iron and steel smelting slag, which mainly includes the following steps: conveying and cooling, crushing, magnetic separation, water washing and transfer accumulation. The water washing equipment used in the above steps includes a falling hopper, a water washing box and a screening device. The hopper is installed on the upper end of the washing box, and a screening device is installed in the washing box. The washing box is a hollow cylindrical structure, and the inner wall of the washing box is uniformly equipped with washing nozzles along its circumferential direction, and the bottom of the washing box is evenly provided with feeding nozzles along its circumferential direction. There is a water outlet at the bottom of the washing box. While washing the slag with water, the present invention evenly stirs the slag to ensure the thoroughness of water washing, and then can preliminarily screen and classify the slag according to the sequence from small to large, saving the need for subsequent processing of the slag. Time for size sorting.

Description

technical field [0001] The invention relates to the technical field of metallurgical waste treatment, in particular to a method for treating iron and steel smelting slag. Background technique [0002] Slag, also known as molten slag, is a melt that floats on the surface of liquid substances such as metals during pyrometallurgy. Its composition is mainly oxides, often containing sulfides and entraining a small amount of metal, so it can be used for secondary use. The slag needs to be processed before it can be used. [0003] At present, the slag treatment method adopted by most domestic iron and steel plants is mostly a simple crushing and magnetic separation process. The process includes transportation, crushing, magnetic separation, water washing and transfer, and the following problems exist during water washing: [0004] (1) During the washing process, the slag is all piled up in one place, so the washing equipment can only wash the slag on the surface of the slag pile, ...

AI Technical Summary

Problems solved by technology

[0004] (1) During the washing process, the slag is all piled up in one place, so the washing equipment can only wash the slag on the surface of the slag pile, and it is difficult to clean the slag in the middle, and the clean slag will also be affected by the unclean slag Pollution, washing effect is extremely unsatisfactory;

[0005] (2) Usually after water washing, regardless of the size of the slag, all the slag will be transported together, and then the slag will be screened according to the size, which needs to process a large amount of slag at the same time, which increases the working intensity of the equipment. To ensure work efficiency, the screening time is tight, and the screening effect is not ideal

[0006] In order to solve the above problems, the present invention provides a treatment method for iron and steel smelting slag, which can solve the problems of incomplete water washing and poor screening effect in the above treatment process

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