Method for processing dust containing zinc and lead in steel plant through closed cupola furnace

Abstract

The invention discloses a method for processing the dust containing zinc and lead in a steel plant through a closed cupola furnace, and belongs to the field of steel production. The method is characterized in that the dust containing the zinc and the lead in the steel plant serves as the main raw material, certain quantities of a reducing agent, a binder, a fusing agent and water are added, and after fully mixing, the mixed materials are pressed by a ball pressing machine into balls; after being dried or maintained, the balls are conveyed into the closed cupola furnace to be smelted, and finally spelter, lead bullion and molten iron are obtained. The method has the advantages of being high in raw material adaptability, strong in production capability, high in processing efficiency and additional value of products and the like. The spelter, the lead bullion, the molten iron, gas, slag and the like can be directly obtained through the dust containing the zinc and the lead in the steel plant, the spelter and the lead bullion can be refined further, and the additional value of the products is improved. The molten iron is preprocessed and then is cast into ingots to be sold. After being processed, the slag can serve as building materials or cement or other production raw materials. The gas can serve as gas fuel to be used in the plant. The method is very obvious in economic benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the field of iron and steel production, and relates to a process for treating dust containing zinc and lead, in particular to a process method for treating dust containing zinc and lead in a closed cupola. Background technique [0002] In the traditional steel production process, a large amount of dust will be produced. This kind of dust is rich in valuable resources such as TFe, CaO, MgO, C, etc., but it also contains zinc, lead and other elements that are unfavorable to the steel production process, so that the dust in the steel Recycling within the process is subject to certain restrictions. As the situation of energy, resources, and environment becomes more and more severe, and the pressure on iron and steel enterprises is also increasing, it is imperative to solve the problem of efficient recycling of zinc and lead dust. [0003] At present, many domestic iron and steel enterprises directly mix zinc and lead dust as raw m...

AI Technical Summary

Problems solved by technology

The rotary hearth furnace process removes harmful elements such as lead and zinc from the dust through mixing-batching-forming-rotary hearth furnace direct reduction and other processes to obtain direct reduced iron, which can be returned to the steel production process for use. The advantage of this process lies in the treatment It has high efficiency, moderate processing capacity, and low energy requirements. It can directly use the by-product gas of the iron and steel plant as the heat source, and can well recover iron, zinc, lead and other metals in the dust, but the rotary hearth furnace process also has some Technical problems and shortcomings that are difficult to overcome, such as high furnace, thin material layer, and low energy utilization efficiency, need further research and improvement

The cupola smelting reduction process has a high metal recovery rate and a wide range of dust treatment. The product is molten iron, which can be directly used for steelmaking without a sintering machine. The environmental protection effect is relatively good, but the process requires a large investment and equipment Short operating cycle and large amount of maintenance will directly affect the operating cost of the process

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