Process method for processing solid waste of steelworks by utilizing smelting furnace

Abstract

The invention relates to a process method for processing iron-containing solid waste of steelworks by utilizing a smelting furnace. The process method comprises the following steps: with blast furnace dust containing zinc and lead, revolving furnace sludge, electric furnace fly ash, slag metal, waste metal and the like as principal raw materials, carrying out condensation agglomeration and high-temperature agglomeration, and carrying out operations such as maintaining or cooling and granulation so as to obtain finished agglomerates; after mixing the finished agglomerates with coke, sending the mixture into the smelting furnace to be subjected to high-temperature smelting, simultaneously adding the waste such as zinc-containing waste into the smelting furnace in a certain proportion to finally generate high-temperature mixed gas, separating elements such as carbon from the mixed gas by utilizing a cyclone dust collector at the top of the furnace, recycling carbon-containing dust again, further separating the residual mixed gas by utilizing a bag-type dust collector so as to obtain zinc-rich and lead-rich dust, and recycling the zinc-rich and lead-rich dust and applying the zinc-rich and lead-rich dust to the high-temperature agglomeration, the hot air preheating of the smelting furnace and a smelting furnace purification process; then purifying the collected zinc-rich and lead-rich dust, so as to obtain high-purity zinc and lead products; regularly opening a lead discharging hole in the bottom of the smelting furnace, and collecting lead liquid so as to simultaneously obtain wet lead and products such as molten iron and furnace slag.

Description

technical field [0001] The invention relates to a process for treating solid waste containing zinc and lead in iron and steel plants, in particular to a process for treating solid waste with a melting furnace and recovering valuable elements such as zinc and lead. Background technique [0002] Iron-containing solid waste in iron and steel plants is mainly dust and sludge generated by dust removal processes in various processes such as sintering, pelletizing, blast furnace, converter, electric furnace and rolling, as well as resources such as slag steel and scrap steel, which generally contain iron, carbon and a certain amount In the traditional blast furnace-converter steel production process, the output of solid waste is about 10% of the crude steel output. In 2012, the crude steel output in my country was about 700 million tons, and the annual iron-containing solid waste produced The amount is about 70 million tons, which is very large. Therefore, the resourceful and efficie...

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Problems solved by technology

[0003] Iron-containing solid waste in iron and steel plants is rich in valuable resources such as Fe, CaO, MgO, and C. At present, many domestic and foreign enterprises use iron-containing dust and sludge as raw materials directly into sintering and pelletizing, which can achieve iron-containing waste in iron and steel plants to a certain extent. The resource utilization of solid waste, but the existence of harmful elements such as K, Na, Zn and Pb in iron-containing solid waste limits its large-scale recycling in the iron and steel process, so the traditional iron and steel process can only consume part of the harmful elements Iron-containing solid waste resources with low content

[0004] The rotary hearth furnace process is currently a relatively concerned process for treating zinc and lead dust in iron and steel plants (patent number: 200810222976.8). This process combines zinc and lead dust through mixing-batching-forming-rotary hearth furnace direct reduction The process removes harmful elements such as lead and zinc to obtain direct reduced iron. The advantages of this process are high processing efficiency, moderate processing capacity, and low energy requirements. The by-product gas of the steel plant can be directly used as a heat source, but the process It can only process iron-containing waste with low zinc and lead content and high total iron content, and it is difficult to process solid waste with large particle size such as slag steel. Shortcomings such as stability are yet to be further studied

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