Method for recycling dedusting sludge of steel smelting converter and solid waste resources of steel and iron plant

Abstract

The invention relates to a method for recycling dedusting sludge of a steel smelting converter and solid waste resources of a steel and iron plant. The method comprises the following steps of (1) precipitating the sludge by an inclined plate precipitation tank, so as to obtain OG mud with concentration of 25% to 30%, and conveying into a gravity precipitating tank by a pipeline to perform precipitating and collecting; (2) respectively conveying gas ash and dedusting ash into a high-level material bin; (3) adding the gas ash, the dedusting ash and an additive into a high-level mixing tank, and stirring and uniformly mixing with the OG mud, so as to obtain the mud with concentration of 35% to 55%; (4) dewatering the mud obtained in step (3) by a ceramic filtering machine, so as to obtain a dry mixture filtrate cake; scraping by a scraping knife, so as to obtain the mixture material. The method has the advantages that the property and characteristic of the mixture are effectively changed; the problem of dewatering of the mixture is conveniently solved, the problems of high water content, difficulty in transportation, high stacking and airing cost, serious pollution to environment, undesired use effect and the like in the existing OG mud are solved, and the stable economic benefit and good social benefit are brought for enterprises.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste resources in iron and steel metallurgical enterprises, and in particular relates to a method for recycling and utilizing solid waste resources in steelmaking converters and sludge from steelmaking converters. Background technique [0002] The coal gas produced by steelmaking converters in metallurgical enterprises contains a large amount of dust. For each ton of converter steel produced, about 30-50 kg of smoke and dust are produced. Wet dust removal treatment is used to deposit the smoke and dust, and the concentration obtained through the inclined plate sedimentation tank is About 25% of OG mud, the further treatment process is dehydration by plate and frame filter press to obtain 30-35% OG dust sludge, which contains iron, calcium, magnesium and other beneficial elements, and is a good renewable resource for iron and steel enterprises. [0003] The current OG mud-water se...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for recycling steelmaking converter dedusting sludge and steel plant solid waste resources. Gas ash, dust removal ash and other solid wastes are all utilized, which effectively solves the problem of difficult dehydration of OG mud under the existing technological conditions, and the problem of high water content of more than 30%; the transportation and storage of high-moisture OG mud cause environmental pollution and inhomogeneity Difficulties in compounding and recycling; a series of problems such as gas ash, various types of dust-removing ash and other low-water "dry" materials, environmental pollution caused by separate compounding of multiple varieties, uneven compounding, etc.: Converter gas washing water is everywhere with OG mud Flow pollutes the environment and wastes resources; dry and wet materials are transported backwards, making it difficult to realize mechanized, automated, efficient transportation, uniform mixing, and accurate dosing

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